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Modify the relcache to record the temp status of both local and nonlocal

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temp relations; this is no more expensive than before, now that we have
pg_class.relistemp.  Insert tests into bufmgr.c to prevent attempting
to fetch pages from nonlocal temp relations.  This provides a low-level
defense against bugs-of-omission allowing temp pages to be loaded into shared
buffers, as in the contrib/pgstattuple problem reported by Stuart Bishop.
While at it, tweak a bunch of places to use new relcache tests (instead of
expensive probes into pg_namespace) to detect local or nonlocal temp tables.
This commit is contained in:
Tom Lane
2009-03-31 22:12:48 +00:00
parent 84a059abf7
commit 948d6ec90f
14 changed files with 92 additions and 56 deletions
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8
src/backend/commands/cluster.c
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.182 2009/02/02 19:31:38 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.183 2009/03/31 22:12:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -117,7 +117,7 @@ cluster(ClusterStmt *stmt, bool isTopLevel)
* Reject clustering a remote temp table ... their local buffer
* manager is not going to cope.
*/
if (isOtherTempNamespace(RelationGetNamespace(rel)))
if (RELATION_IS_OTHER_TEMP(rel))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot cluster temporary tables of other sessions")));
@ -302,7 +302,7 @@ cluster_rel(RelToCluster *rvtc, bool recheck, bool verbose)
* check_index_is_clusterable which is redundant, but we leave it for
* extra safety.
*/
if (isOtherTempNamespace(RelationGetNamespace(OldHeap)))
if (RELATION_IS_OTHER_TEMP(OldHeap))
{
relation_close(OldHeap, AccessExclusiveLock);
return;
@ -465,7 +465,7 @@ check_index_is_clusterable(Relation OldHeap, Oid indexOid, bool recheck)
* Don't allow cluster on temp tables of other backends ... their local
* buffer manager is not going to cope.
*/
if (isOtherTempNamespace(RelationGetNamespace(OldHeap)))
if (RELATION_IS_OTHER_TEMP(OldHeap))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot cluster temporary tables of other sessions")));