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From: Haozhou Wang <hawang@pivotal.io>
Date: Thu, 22 Nov 2018 19:25:37 +0800
Message-ID: 
 <CAL_NLpKf6HzgGzWriuSW2U3CEykEXA9Z5vyEqBW0Hk5btr6Liw@mail.gmail.com>
Subject: Re: Control your disk usage in PG: Introduction to Disk Quota
 Extension
To: robertmhaas@gmail.com
Cc: pgsql-hackers@postgresql.org, tomas.vondra@2ndquadrant.com
Content-Type: multipart/mixed; boundary="000000000000e886be057b3f20fa"
Precedence: bulk


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Thank you very much for your review.
We refactored our patch with new names and comments.

For ReadBufferExtended hook, yes, Readbuffer with P_NEW will then call
smgrextend.

But in smgrextend, we cannot get the oid of a relation, and it will take
some time to get the oid via smgrrelation.
We would like to add a hook just before the smgrextend to get the oid and
avoid use RelidByRelfilenode().

New patch is attached in the attachment.
Thank a lot!

Regards,
Haozhou


On Wed, Nov 21, 2018 at 10:48 PM Robert Haas <robertmhaas@gmail.com> wrote:

> On Tue, Nov 20, 2018 at 2:20 AM Haozhou Wang <hawang@pivotal.io> wrote:
> > We prepared a patch that includes the hook points. And such hook points
> are needed for disk quota extension.
> > There are two hooks.
> > One is SmgrStat_hook. It's used to perform ad-hoc logic in storage when
> doing smgr create/extend/truncate in general. As for disk quota extension,
> this hook is used to detect active tables(new created tables, tables
> extending new blocks, or tables being truncated)
> > The other is BufferExtendCheckPerms_hook. It's used to perform ad-hoc
> logic when buffer extend a new block. Since ReadBufferExtended is a hot
> function, we call this hook only when blockNum == P_NEW. As  for disk quota
> extension, this hook is used to do query enforcement during the query is
> loading data.
> >
> > Any comments are appreciated.
>
> +1 for adding some hooks to support this kind of thing, but I think
> the names you've chosen are not very good.  The hook name should
> describe the place from which it is called, not the purpose for which
> one imagines that it will be used, because somebody else might imagine
> another use.  Both BufferExtendCheckPerms_hook_type and
> SmgrStat_hook_type are imagining that they know what the hook does -
> CheckPerms in the first case and Stat in the second case.
>
> For this particular purpose, I don't immediately see why you need a
> hook in both places.  If ReadBuffer is called with P_NEW, aren't we
> guaranteed to end up in smgrextend()?
>
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company
>

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<div dir=3D"ltr">Thank you very much for your review.<div><div>We refactore=
d our patch with new names and comments.</div><br class=3D"gmail-Apple-inte=
rchange-newline"></div><div>For ReadBufferExtended hook, yes, Readbuffer wi=
th P_NEW will then call smgrextend.</div><div><br></div><div>But in smgrext=
end, we cannot get the oid of a relation, and it will take some time to get=
 the oid via smgrrelation.</div><div>We would like to add a hook just befor=
e the smgrextend to get the oid and avoid use=C2=A0RelidByRelfilenode().</d=
iv><div><br><div>New patch is attached in the attachment.</div><div>Thank a=
 lot!</div><div><br></div><div>Regards,</div><div>Haozhou</div><div><br></d=
iv></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Nov 21, 20=
18 at 10:48 PM Robert Haas &lt;<a href=3D"mailto:robertmhaas@gmail.com">rob=
ertmhaas@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">O=
n Tue, Nov 20, 2018 at 2:20 AM Haozhou Wang &lt;<a href=3D"mailto:hawang@pi=
votal.io" target=3D"_blank">hawang@pivotal.io</a>&gt; wrote:<br>
&gt; We prepared a patch that includes the hook points. And such hook point=
s are needed for disk quota extension.<br>
&gt; There are two hooks.<br>
&gt; One is SmgrStat_hook. It&#39;s used to perform ad-hoc logic in storage=
 when doing smgr create/extend/truncate in general. As for disk quota exten=
sion, this hook is used to detect active tables(new created tables, tables =
extending new blocks, or tables being truncated)<br>
&gt; The other is BufferExtendCheckPerms_hook. It&#39;s used to perform ad-=
hoc logic when buffer extend a new block. Since ReadBufferExtended is a hot=
 function, we call this hook only when blockNum =3D=3D P_NEW. As=C2=A0 for =
disk quota extension, this hook is used to do query enforcement during the =
query is loading data.<br>
&gt;<br>
&gt; Any comments are appreciated.<br>
<br>
+1 for adding some hooks to support this kind of thing, but I think<br>
the names you&#39;ve chosen are not very good.=C2=A0 The hook name should<b=
r>
describe the place from which it is called, not the purpose for which<br>
one imagines that it will be used, because somebody else might imagine<br>
another use.=C2=A0 Both BufferExtendCheckPerms_hook_type and<br>
SmgrStat_hook_type are imagining that they know what the hook does -<br>
CheckPerms in the first case and Stat in the second case.<br>
<br>
For this particular purpose, I don&#39;t immediately see why you need a<br>
hook in both places.=C2=A0 If ReadBuffer is called with P_NEW, aren&#39;t w=
e<br>
guaranteed to end up in smgrextend()?<br>
<br>
-- <br>
Robert Haas<br>
EnterpriseDB: <a href=3D"http://www.enterprisedb.com" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.enterprisedb.com</a><br>
The Enterprise PostgreSQL Company<br>
</blockquote></div><br clear=3D"all"><div><br></div></div>

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