diff options
Diffstat (limited to 'src/backend/utils/cache/relcache.c')
| -rw-r--r-- | src/backend/utils/cache/relcache.c | 62 |
1 files changed, 30 insertions, 32 deletions
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c index 0fe1f29b251..08697d50366 100644 --- a/src/backend/utils/cache/relcache.c +++ b/src/backend/utils/cache/relcache.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.246 2006/07/14 14:52:25 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.247 2006/07/31 20:09:05 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -17,7 +17,6 @@ * RelationCacheInitialize - initialize relcache (to empty) * RelationCacheInitializePhase2 - finish initializing relcache * RelationIdGetRelation - get a reldesc by relation id - * RelationIdCacheGetRelation - get a cached reldesc by relid * RelationClose - close an open relation * * NOTES @@ -34,6 +33,7 @@ #include "access/heapam.h" #include "access/reloptions.h" #include "access/xact.h" +#include "catalog/catalog.h" #include "catalog/indexing.h" #include "catalog/namespace.h" #include "catalog/pg_amop.h" @@ -763,6 +763,10 @@ equalRuleLocks(RuleLock *rlock1, RuleLock *rlock2) * recycling the given old relation object. The latter case * supports rebuilding a relcache entry without invalidating * pointers to it. + * + * Returns NULL if no pg_class row could be found for the given relid + * (suggesting we are trying to access a just-deleted relation). + * Any other error is reported via elog. * -------------------------------- */ static Relation @@ -1388,22 +1392,29 @@ formrdesc(const char *relationName, Oid relationReltype, */ /* - * RelationIdCacheGetRelation + * RelationIdGetRelation * - * Lookup an existing reldesc by OID. + * Lookup a reldesc by OID; make one if not already in cache. * - * Only try to get the reldesc by looking in the cache, - * do not go to the disk if it's not present. + * Returns NULL if no pg_class row could be found for the given relid + * (suggesting we are trying to access a just-deleted relation). + * Any other error is reported via elog. * - * NB: relation ref count is incremented if successful. + * NB: caller should already have at least AccessShareLock on the + * relation ID, else there are nasty race conditions. + * + * NB: relation ref count is incremented, or set to 1 if new entry. * Caller should eventually decrement count. (Usually, * that happens by calling RelationClose().) */ Relation -RelationIdCacheGetRelation(Oid relationId) +RelationIdGetRelation(Oid relationId) { Relation rd; + /* + * first try to find reldesc in the cache + */ RelationIdCacheLookup(relationId, rd); if (RelationIsValid(rd)) @@ -1412,31 +1423,8 @@ RelationIdCacheGetRelation(Oid relationId) /* revalidate nailed index if necessary */ if (!rd->rd_isvalid) RelationReloadClassinfo(rd); - } - - return rd; -} - -/* - * RelationIdGetRelation - * - * Lookup a reldesc by OID; make one if not already in cache. - * - * NB: relation ref count is incremented, or set to 1 if new entry. - * Caller should eventually decrement count. (Usually, - * that happens by calling RelationClose().) - */ -Relation -RelationIdGetRelation(Oid relationId) -{ - Relation rd; - - /* - * first try and get a reldesc from the cache - */ - rd = RelationIdCacheGetRelation(relationId); - if (RelationIsValid(rd)) return rd; + } /* * no reldesc in the cache, so have RelationBuildDesc() build one and add @@ -2134,6 +2122,16 @@ RelationBuildLocalRelation(const char *relname, } /* + * check that hardwired list of shared rels matches what's in the + * bootstrap .bki file. If you get a failure here during initdb, + * you probably need to fix IsSharedRelation() to match whatever + * you've done to the set of shared relations. + */ + if (shared_relation != IsSharedRelation(relid)) + elog(ERROR, "shared_relation flag for \"%s\" does not match IsSharedRelation(%u)", + relname, relid); + + /* * switch to the cache context to create the relcache entry. */ if (!CacheMemoryContext) |