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[PATCH v6] Avoid orphaned objects dependencies
186+ messages / 5 participants
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* [PATCH v6] Avoid orphaned objects dependencies
@ 2024-03-29 15:43  Bertrand Drouvot <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: Bertrand Drouvot @ 2024-03-29 15:43 UTC (permalink / raw)

It's currently possible to create orphaned objects dependencies, for example:

Scenario 1:

session 1: begin; drop schema schem;
session 2: create a function in the schema schem
session 1: commit;

With the above, the function created in session 2 would be linked to a non
existing schema.

Scenario 2:

session 1: begin; create a function in the schema schem
session 2: drop schema schem;
session 1: commit;

With the above, the function created in session 1 would be linked to a non
existing schema.

To avoid those scenarios, a new lock (that conflicts with a lock taken by DROP)
has been put in place when the dependencies are being recorded. With this in
place, the drop schema in scenario 2 would be locked.

Also, after the new lock attempt, the patch checks that the object still exists:
with this in place session 2 in scenario 1 would be locked and would report an
error once session 1 committs (that would not be the case should session 1 abort
the transaction).

If the object is dropped before the new lock attempt is triggered then the patch
would also report an error (but with less details).

The patch adds a few tests for some dependency cases (that would currently produce
orphaned objects):

- schema and function (as the above scenarios)
- alter a dependency (function and schema)
- function and arg type
- function and return type
- function and function
- domain and domain
- table and type
- server and foreign data wrapper
---
 src/backend/catalog/dependency.c              |  54 ++++++++
 src/backend/catalog/objectaddress.c           |  70 ++++++++++
 src/backend/catalog/pg_depend.c               |  12 ++
 src/include/catalog/dependency.h              |   1 +
 src/include/catalog/objectaddress.h           |   1 +
 .../expected/test_dependencies_locks.out      | 129 ++++++++++++++++++
 src/test/isolation/isolation_schedule         |   1 +
 .../specs/test_dependencies_locks.spec        |  89 ++++++++++++
 8 files changed, 357 insertions(+)
  24.1% src/backend/catalog/
  45.9% src/test/isolation/expected/
  28.6% src/test/isolation/specs/

diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index d4b5b2ade1..a49357bbe2 100644
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -1517,6 +1517,60 @@ AcquireDeletionLock(const ObjectAddress *object, int flags)
 	}
 }
 
+/*
+ * depLockAndCheckObject
+ *
+ * Lock the object that we are about to record a dependency on.
+ * After it's locked, verify that it hasn't been dropped while we
+ * weren't looking.  If the object has been dropped, this function
+ * does not return!
+ */
+void
+depLockAndCheckObject(const ObjectAddress *object)
+{
+	char	   *object_description;
+
+	/*
+	 * Those don't rely on LockDatabaseObject() when being dropped (see
+	 * AcquireDeletionLock()). Also it looks like they can not produce
+	 * orphaned dependent objects when being dropped.
+	 */
+	if (object->classId == RelationRelationId || object->classId == AuthMemRelationId)
+		return;
+
+	object_description = getObjectDescription(object, true);
+
+	/* assume we should lock the whole object not a sub-object */
+	LockDatabaseObject(object->classId, object->objectId, 0, AccessShareLock);
+
+	/* check if object still exists */
+	if (!ObjectByIdExist(object, false))
+	{
+		/*
+		 * It might be possible that we are creating it (for example creating
+		 * a composite type while creating a relation), so bypass the syscache
+		 * lookup and use a dirty snaphot instead to cover this scenario.
+		 */
+		if (!ObjectByIdExist(object, true))
+		{
+			/*
+			 * If the object has been dropped before we get a chance to get
+			 * its description, then emit a generic error message. That looks
+			 * like a good compromise over extra complexity.
+			 */
+			if (object_description)
+				ereport(ERROR, errmsg("%s does not exist", object_description));
+			else
+				ereport(ERROR, errmsg("a dependent object does not exist"));
+		}
+	}
+
+	if (object_description)
+		pfree(object_description);
+
+	return;
+}
+
 /*
  * ReleaseDeletionLock - release an object deletion lock
  *
diff --git a/src/backend/catalog/objectaddress.c b/src/backend/catalog/objectaddress.c
index 7b536ac6fd..c2b873dd81 100644
--- a/src/backend/catalog/objectaddress.c
+++ b/src/backend/catalog/objectaddress.c
@@ -2590,6 +2590,76 @@ get_object_namespace(const ObjectAddress *address)
 	return oid;
 }
 
+/*
+ * ObjectByIdExist
+ *
+ * Return whether the given object exists.
+ *
+ * Works for most catalogs, if no special processing is needed.
+ */
+bool
+ObjectByIdExist(const ObjectAddress *address, bool use_dirty_snapshot)
+{
+	HeapTuple	tuple;
+	int			cache = -1;
+	const ObjectPropertyType *property;
+
+	if (!use_dirty_snapshot)
+	{
+		property = get_object_property_data(address->classId);
+
+		cache = property->oid_catcache_id;
+	}
+
+	if (cache >= 0)
+	{
+		/* Fetch tuple from syscache. */
+		tuple = SearchSysCache1(cache, ObjectIdGetDatum(address->objectId));
+
+		if (!HeapTupleIsValid(tuple))
+		{
+			return false;
+		}
+
+		ReleaseSysCache(tuple);
+
+		return true;
+	}
+	else
+	{
+		Relation	rel;
+		ScanKeyData skey[1];
+		SysScanDesc scan;
+		SnapshotData DirtySnapshot;
+		Snapshot	snapshot;
+
+		if (use_dirty_snapshot)
+		{
+			InitDirtySnapshot(DirtySnapshot);
+			snapshot = &DirtySnapshot;
+		}
+		else
+			snapshot = NULL;
+
+		rel = table_open(address->classId, AccessShareLock);
+
+		ScanKeyInit(&skey[0],
+					get_object_attnum_oid(address->classId),
+					BTEqualStrategyNumber, F_OIDEQ,
+					ObjectIdGetDatum(address->objectId));
+
+		scan = systable_beginscan(rel, get_object_oid_index(address->classId), true,
+								  snapshot, 1, skey);
+
+		/* we expect exactly one match */
+		tuple = systable_getnext(scan);
+		systable_endscan(scan);
+		table_close(rel, AccessShareLock);
+
+		return (HeapTupleIsValid(tuple));
+	}
+}
+
 /*
  * Return ObjectType for the given object type as given by
  * getObjectTypeDescription; if no valid ObjectType code exists, but it's a
diff --git a/src/backend/catalog/pg_depend.c b/src/backend/catalog/pg_depend.c
index 5366f7820c..f16af28429 100644
--- a/src/backend/catalog/pg_depend.c
+++ b/src/backend/catalog/pg_depend.c
@@ -108,6 +108,12 @@ recordMultipleDependencies(const ObjectAddress *depender,
 		if (isObjectPinned(referenced))
 			continue;
 
+		/*
+		 * Acquire a lock and check object still exists while recording the
+		 * dependency. XXX - Should we do so only for DEPENDENCY_NORMAL?
+		 */
+		depLockAndCheckObject(referenced);
+
 		if (slot_init_count < max_slots)
 		{
 			slot[slot_stored_count] = MakeSingleTupleTableSlot(RelationGetDescr(dependDesc),
@@ -506,6 +512,12 @@ changeDependencyFor(Oid classId, Oid objectId,
 		return 1;
 	}
 
+	/*
+	 * Acquire a lock and check object still exists while changing the
+	 * dependency.
+	 */
+	depLockAndCheckObject(&objAddr);
+
 	depRel = table_open(DependRelationId, RowExclusiveLock);
 
 	/* There should be existing dependency record(s), so search. */
diff --git a/src/include/catalog/dependency.h b/src/include/catalog/dependency.h
index 7eee66f810..5619b6f55e 100644
--- a/src/include/catalog/dependency.h
+++ b/src/include/catalog/dependency.h
@@ -101,6 +101,7 @@ typedef struct ObjectAddresses ObjectAddresses;
 /* in dependency.c */
 
 extern void AcquireDeletionLock(const ObjectAddress *object, int flags);
+extern void depLockAndCheckObject(const ObjectAddress *object);
 
 extern void ReleaseDeletionLock(const ObjectAddress *object);
 
diff --git a/src/include/catalog/objectaddress.h b/src/include/catalog/objectaddress.h
index 3a70d80e32..04891abcc1 100644
--- a/src/include/catalog/objectaddress.h
+++ b/src/include/catalog/objectaddress.h
@@ -53,6 +53,7 @@ extern void check_object_ownership(Oid roleid,
 								   Node *object, Relation relation);
 
 extern Oid	get_object_namespace(const ObjectAddress *address);
+extern bool ObjectByIdExist(const ObjectAddress *address, bool use_dirty_snapshot);
 
 extern bool is_objectclass_supported(Oid class_id);
 extern const char *get_object_class_descr(Oid class_id);
diff --git a/src/test/isolation/expected/test_dependencies_locks.out b/src/test/isolation/expected/test_dependencies_locks.out
new file mode 100644
index 0000000000..9b645d7aa5
--- /dev/null
+++ b/src/test/isolation/expected/test_dependencies_locks.out
@@ -0,0 +1,129 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_begin s1_create_function_in_schema s2_drop_schema s1_commit
+step s1_begin: BEGIN;
+step s1_create_function_in_schema: CREATE FUNCTION testschema.foo() RETURNS int AS 'select 1' LANGUAGE sql;
+step s2_drop_schema: DROP SCHEMA testschema; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_schema: <... completed>
+ERROR:  cannot drop schema testschema because other objects depend on it
+
+starting permutation: s2_begin s2_drop_schema s1_create_function_in_schema s2_commit
+step s2_begin: BEGIN;
+step s2_drop_schema: DROP SCHEMA testschema;
+step s1_create_function_in_schema: CREATE FUNCTION testschema.foo() RETURNS int AS 'select 1' LANGUAGE sql; <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_function_in_schema: <... completed>
+ERROR:  schema testschema does not exist
+
+starting permutation: s1_begin s1_alter_function_schema s2_drop_alterschema s1_commit
+step s1_begin: BEGIN;
+step s1_alter_function_schema: ALTER FUNCTION public.falter() SET SCHEMA alterschema;
+step s2_drop_alterschema: DROP SCHEMA alterschema; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_alterschema: <... completed>
+ERROR:  cannot drop schema alterschema because other objects depend on it
+
+starting permutation: s2_begin s2_drop_alterschema s1_alter_function_schema s2_commit
+step s2_begin: BEGIN;
+step s2_drop_alterschema: DROP SCHEMA alterschema;
+step s1_alter_function_schema: ALTER FUNCTION public.falter() SET SCHEMA alterschema; <waiting ...>
+step s2_commit: COMMIT;
+step s1_alter_function_schema: <... completed>
+ERROR:  schema alterschema does not exist
+
+starting permutation: s1_begin s1_create_function_with_argtype s2_drop_foo_type s1_commit
+step s1_begin: BEGIN;
+step s1_create_function_with_argtype: CREATE FUNCTION fooargtype(num foo) RETURNS int AS 'select 1' LANGUAGE sql;
+step s2_drop_foo_type: DROP TYPE public.foo; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_foo_type: <... completed>
+ERROR:  cannot drop type foo because other objects depend on it
+
+starting permutation: s2_begin s2_drop_foo_type s1_create_function_with_argtype s2_commit
+step s2_begin: BEGIN;
+step s2_drop_foo_type: DROP TYPE public.foo;
+step s1_create_function_with_argtype: CREATE FUNCTION fooargtype(num foo) RETURNS int AS 'select 1' LANGUAGE sql; <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_function_with_argtype: <... completed>
+ERROR:  type foo does not exist
+
+starting permutation: s1_begin s1_create_function_with_rettype s2_drop_foo_rettype s1_commit
+step s1_begin: BEGIN;
+step s1_create_function_with_rettype: CREATE FUNCTION footrettype() RETURNS id LANGUAGE sql RETURN 1;
+step s2_drop_foo_rettype: DROP DOMAIN id; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_foo_rettype: <... completed>
+ERROR:  cannot drop type id because other objects depend on it
+
+starting permutation: s2_begin s2_drop_foo_rettype s1_create_function_with_rettype s2_commit
+step s2_begin: BEGIN;
+step s2_drop_foo_rettype: DROP DOMAIN id;
+step s1_create_function_with_rettype: CREATE FUNCTION footrettype() RETURNS id LANGUAGE sql RETURN 1; <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_function_with_rettype: <... completed>
+ERROR:  type id does not exist
+
+starting permutation: s1_begin s1_create_function_with_function s2_drop_function_f s1_commit
+step s1_begin: BEGIN;
+step s1_create_function_with_function: CREATE FUNCTION foofunc() RETURNS int LANGUAGE SQL RETURN f() + 1;
+step s2_drop_function_f: DROP FUNCTION f(); <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_function_f: <... completed>
+ERROR:  cannot drop function f() because other objects depend on it
+
+starting permutation: s2_begin s2_drop_function_f s1_create_function_with_function s2_commit
+step s2_begin: BEGIN;
+step s2_drop_function_f: DROP FUNCTION f();
+step s1_create_function_with_function: CREATE FUNCTION foofunc() RETURNS int LANGUAGE SQL RETURN f() + 1; <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_function_with_function: <... completed>
+ERROR:  function f() does not exist
+
+starting permutation: s1_begin s1_create_domain_with_domain s2_drop_domain_id s1_commit
+step s1_begin: BEGIN;
+step s1_create_domain_with_domain: CREATE DOMAIN idid as id;
+step s2_drop_domain_id: DROP DOMAIN id; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_domain_id: <... completed>
+ERROR:  cannot drop type id because other objects depend on it
+
+starting permutation: s2_begin s2_drop_domain_id s1_create_domain_with_domain s2_commit
+step s2_begin: BEGIN;
+step s2_drop_domain_id: DROP DOMAIN id;
+step s1_create_domain_with_domain: CREATE DOMAIN idid as id; <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_domain_with_domain: <... completed>
+ERROR:  type id does not exist
+
+starting permutation: s1_begin s1_create_table_with_type s2_drop_footab_type s1_commit
+step s1_begin: BEGIN;
+step s1_create_table_with_type: CREATE TABLE tabtype(a footab);
+step s2_drop_footab_type: DROP TYPE public.footab; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_footab_type: <... completed>
+ERROR:  cannot drop type footab because other objects depend on it
+
+starting permutation: s2_begin s2_drop_footab_type s1_create_table_with_type s2_commit
+step s2_begin: BEGIN;
+step s2_drop_footab_type: DROP TYPE public.footab;
+step s1_create_table_with_type: CREATE TABLE tabtype(a footab); <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_table_with_type: <... completed>
+ERROR:  type footab does not exist
+
+starting permutation: s1_begin s1_create_server_with_fdw_wrapper s2_drop_fdw_wrapper s1_commit
+step s1_begin: BEGIN;
+step s1_create_server_with_fdw_wrapper: CREATE SERVER srv_fdw_wrapper FOREIGN DATA WRAPPER fdw_wrapper;
+step s2_drop_fdw_wrapper: DROP FOREIGN DATA WRAPPER fdw_wrapper RESTRICT; <waiting ...>
+step s1_commit: COMMIT;
+step s2_drop_fdw_wrapper: <... completed>
+ERROR:  cannot drop foreign-data wrapper fdw_wrapper because other objects depend on it
+
+starting permutation: s2_begin s2_drop_fdw_wrapper s1_create_server_with_fdw_wrapper s2_commit
+step s2_begin: BEGIN;
+step s2_drop_fdw_wrapper: DROP FOREIGN DATA WRAPPER fdw_wrapper RESTRICT;
+step s1_create_server_with_fdw_wrapper: CREATE SERVER srv_fdw_wrapper FOREIGN DATA WRAPPER fdw_wrapper; <waiting ...>
+step s2_commit: COMMIT;
+step s1_create_server_with_fdw_wrapper: <... completed>
+ERROR:  foreign-data wrapper fdw_wrapper does not exist
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 0342eb39e4..1b67f0bffe 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -114,3 +114,4 @@ test: serializable-parallel-2
 test: serializable-parallel-3
 test: matview-write-skew
 test: lock-nowait
+test: test_dependencies_locks
diff --git a/src/test/isolation/specs/test_dependencies_locks.spec b/src/test/isolation/specs/test_dependencies_locks.spec
new file mode 100644
index 0000000000..5d04dfe9dc
--- /dev/null
+++ b/src/test/isolation/specs/test_dependencies_locks.spec
@@ -0,0 +1,89 @@
+setup
+{
+  CREATE SCHEMA testschema;
+  CREATE SCHEMA alterschema;
+  CREATE TYPE public.foo as enum ('one', 'two');
+  CREATE TYPE public.footab as enum ('three', 'four');
+  CREATE DOMAIN id AS int;
+  CREATE FUNCTION f() RETURNS int LANGUAGE SQL RETURN 1;
+  CREATE FUNCTION public.falter() RETURNS int LANGUAGE SQL RETURN 1;
+  CREATE FOREIGN DATA WRAPPER fdw_wrapper;
+}
+
+teardown
+{
+  DROP FUNCTION IF EXISTS testschema.foo();
+  DROP FUNCTION IF EXISTS fooargtype(num foo);
+  DROP FUNCTION IF EXISTS footrettype();
+  DROP FUNCTION IF EXISTS foofunc();
+  DROP FUNCTION IF EXISTS public.falter();
+  DROP FUNCTION IF EXISTS alterschema.falter();
+  DROP DOMAIN IF EXISTS idid;
+  DROP SERVER IF EXISTS srv_fdw_wrapper;
+  DROP TABLE IF EXISTS tabtype;
+  DROP SCHEMA IF EXISTS testschema;
+  DROP SCHEMA IF EXISTS alterschema;
+  DROP TYPE IF EXISTS public.foo;
+  DROP TYPE IF EXISTS public.footab;
+  DROP DOMAIN IF EXISTS id;
+  DROP FUNCTION IF EXISTS f();
+  DROP FOREIGN DATA WRAPPER IF EXISTS fdw_wrapper;
+}
+
+session "s1"
+
+step "s1_begin" { BEGIN; }
+step "s1_create_function_in_schema" { CREATE FUNCTION testschema.foo() RETURNS int AS 'select 1' LANGUAGE sql; }
+step "s1_create_function_with_argtype" { CREATE FUNCTION fooargtype(num foo) RETURNS int AS 'select 1' LANGUAGE sql; }
+step "s1_create_function_with_rettype" { CREATE FUNCTION footrettype() RETURNS id LANGUAGE sql RETURN 1; }
+step "s1_create_function_with_function" { CREATE FUNCTION foofunc() RETURNS int LANGUAGE SQL RETURN f() + 1; }
+step "s1_alter_function_schema" { ALTER FUNCTION public.falter() SET SCHEMA alterschema; }
+step "s1_create_domain_with_domain" { CREATE DOMAIN idid as id; }
+step "s1_create_table_with_type" { CREATE TABLE tabtype(a footab); }
+step "s1_create_server_with_fdw_wrapper" { CREATE SERVER srv_fdw_wrapper FOREIGN DATA WRAPPER fdw_wrapper; }
+step "s1_commit" { COMMIT; }
+
+session "s2"
+
+step "s2_begin" { BEGIN; }
+step "s2_drop_schema" { DROP SCHEMA testschema; }
+step "s2_drop_alterschema" { DROP SCHEMA alterschema; }
+step "s2_drop_foo_type" { DROP TYPE public.foo; }
+step "s2_drop_foo_rettype" { DROP DOMAIN id; }
+step "s2_drop_footab_type" { DROP TYPE public.footab; }
+step "s2_drop_function_f" { DROP FUNCTION f(); }
+step "s2_drop_domain_id" { DROP DOMAIN id; }
+step "s2_drop_fdw_wrapper" { DROP FOREIGN DATA WRAPPER fdw_wrapper RESTRICT; }
+step "s2_commit" { COMMIT; }
+
+# function - schema
+permutation "s1_begin" "s1_create_function_in_schema" "s2_drop_schema" "s1_commit"
+permutation "s2_begin" "s2_drop_schema" "s1_create_function_in_schema" "s2_commit"
+
+# alter function - schema
+permutation "s1_begin" "s1_alter_function_schema" "s2_drop_alterschema" "s1_commit"
+permutation "s2_begin" "s2_drop_alterschema" "s1_alter_function_schema" "s2_commit"
+
+# function - argtype
+permutation "s1_begin" "s1_create_function_with_argtype" "s2_drop_foo_type" "s1_commit"
+permutation "s2_begin" "s2_drop_foo_type" "s1_create_function_with_argtype" "s2_commit"
+
+# function - rettype
+permutation "s1_begin" "s1_create_function_with_rettype" "s2_drop_foo_rettype" "s1_commit"
+permutation "s2_begin" "s2_drop_foo_rettype" "s1_create_function_with_rettype" "s2_commit"
+
+# function - function
+permutation "s1_begin" "s1_create_function_with_function" "s2_drop_function_f" "s1_commit"
+permutation "s2_begin" "s2_drop_function_f" "s1_create_function_with_function" "s2_commit"
+
+# domain - domain
+permutation "s1_begin" "s1_create_domain_with_domain" "s2_drop_domain_id" "s1_commit"
+permutation "s2_begin" "s2_drop_domain_id" "s1_create_domain_with_domain" "s2_commit"
+
+# table - type
+permutation "s1_begin" "s1_create_table_with_type" "s2_drop_footab_type" "s1_commit"
+permutation "s2_begin" "s2_drop_footab_type" "s1_create_table_with_type" "s2_commit"
+
+# server - foreign data wrapper
+permutation "s1_begin" "s1_create_server_with_fdw_wrapper" "s2_drop_fdw_wrapper" "s1_commit"
+permutation "s2_begin" "s2_drop_fdw_wrapper" "s1_create_server_with_fdw_wrapper" "s2_commit"
-- 
2.34.1


--rJmn4JZRBVtiOSY4--





^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread

* [PATCH v2 1/2] Do not lock tables in get_tables_to_repack().
@ 2026-06-16 06:49  ChangAo Chen <[email protected]>
  0 siblings, 0 replies; 186+ messages in thread

From: ChangAo Chen @ 2026-06-16 06:49 UTC (permalink / raw)

When doing a whole database repack, we build a list of repackable
tables and take a lock on them to prevent concurrent drops. But
concurrent drops can always happen after we build the list because
we process each table in a separate transaction. The
ConditionalLockRelationOid() also makes the default behavior like
SKIP_LOCKED, which is unexpected.

To remove the locks, we need to make repack_is_permitted_for_relation()
handles concurrent drops correctly: it should not report an error
when failing to search the syscache in pg_class_aclcheck(). Use
pg_class_aclcheck_ext() instead to detect a concurrent drop. Also
check the return value of get_rel_name().

While at it, replace relation_close() with table_close() to match
the table_open().
---
 src/backend/commands/repack.c | 67 ++++++++++-------------------------
 1 file changed, 19 insertions(+), 48 deletions(-)

diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index faa07d1a118..2879c8af574 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -2169,22 +2169,9 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			index = (Form_pg_index) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the index's table, to ensure it
-			 * doesn't go away while we collect the list.  If we cannot, just
-			 * disregard it.  Be sure to release this if we ultimately decide
-			 * not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(index->indrelid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists; skip if not */
 			classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(index->indrelid));
 			if (!HeapTupleIsValid(classtup))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 			classForm = (Form_pg_class) GETSTRUCT(classtup);
 
 			/* Skip temp relations belonging to other sessions */
@@ -2192,7 +2179,6 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 				!isTempOrTempToastNamespace(classForm->relnamespace))
 			{
 				ReleaseSysCache(classtup);
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
 			}
 
@@ -2201,10 +2187,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, index->indrelid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(index->indrelid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2228,45 +2211,20 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 
 			class = (Form_pg_class) GETSTRUCT(tuple);
 
-			/*
-			 * Try to obtain a light lock on the table, to ensure it doesn't
-			 * go away while we collect the list.  If we cannot, just
-			 * disregard the table.  Be sure to release this if we ultimately
-			 * decide not to process the table!
-			 */
-			if (!ConditionalLockRelationOid(class->oid, AccessShareLock))
-				continue;
-
-			/* Verify that the table still exists */
-			if (!SearchSysCacheExists1(RELOID, ObjectIdGetDatum(class->oid)))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
-				continue;
-			}
-
 			/* Can only process plain tables and matviews */
 			if (class->relkind != RELKIND_RELATION &&
 				class->relkind != RELKIND_MATVIEW)
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Skip temp relations belonging to other sessions */
 			if (class->relpersistence == RELPERSISTENCE_TEMP &&
 				!isTempOrTempToastNamespace(class->relnamespace))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* noisily skip rels which the user can't process */
 			if (!repack_is_permitted_for_relation(cmd, class->oid,
 												  GetUserId()))
-			{
-				UnlockRelationOid(class->oid, AccessShareLock);
 				continue;
-			}
 
 			/* Use a permanent memory context for the result list */
 			oldcxt = MemoryContextSwitchTo(permcxt);
@@ -2279,7 +2237,7 @@ get_tables_to_repack(RepackCommand cmd, bool usingindex, MemoryContext permcxt)
 	}
 
 	table_endscan(scan);
-	relation_close(catalog, AccessShareLock);
+	table_close(catalog, AccessShareLock);
 
 	return rtcs;
 }
@@ -2357,15 +2315,28 @@ get_tables_to_repack_partitioned(RepackCommand cmd, Oid relid,
 static bool
 repack_is_permitted_for_relation(RepackCommand cmd, Oid relid, Oid userid)
 {
+	bool		is_missing = false;
+
 	Assert(cmd == REPACK_COMMAND_CLUSTER || cmd == REPACK_COMMAND_REPACK);
 
-	if (pg_class_aclcheck(relid, userid, ACL_MAINTAIN) == ACLCHECK_OK)
+	if (pg_class_aclcheck_ext(relid, userid, ACL_MAINTAIN, &is_missing) == ACLCHECK_OK)
 		return true;
 
-	ereport(WARNING,
-			errmsg("permission denied to execute %s on \"%s\", skipping it",
-				   RepackCommandAsString(cmd),
-				   get_rel_name(relid)));
+	/* Report a warning if the relation still exists. */
+	if (!is_missing)
+	{
+		char	   *relname;
+
+		relname = get_rel_name(relid);
+		if (relname != NULL)
+		{
+			ereport(WARNING,
+					errmsg("permission denied to execute %s on \"%s\", skipping it",
+						   RepackCommandAsString(cmd), relname));
+
+			pfree(relname);
+		}
+	}
 
 	return false;
 }
-- 
2.47.3


--op6mnexl7cn72cto
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment; filename=v2-0002-fixups.patch



^ permalink  raw  reply  [nested|flat] 186+ messages in thread