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Upgrade formrdesc() so that it can correctly initialize the tupledesc

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(rd_att) field of a nailed-in-cache relcache entry.  This fixes the bug
reported by Alvaro 8-Dec-2004; I believe it probably also explains
Grant Finnemore's report of 10-Sep-2004.

In an unrelated change in the same file, put back 7.4's response to
failure to rename() the relcache init file, ie, unlink the useless
temp file.  I did not put back the warning message, since there might
actually be some reason not to have that.
This commit is contained in:
Tom Lane
2004-12-12 05:07:50 +00:00
parent 12b1b5d837
commit 984791e0e1
2 changed files with 39 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
src/backend/utils/cache/relcache.c vendored
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.212 2004/11/20 20:19:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.213 2004/12/12 05:07:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -257,8 +257,8 @@ static Relation RelationSysNameCacheGetRelation(const char *relationName);
static bool load_relcache_init_file(void);
static void write_relcache_init_file(void);
static void formrdesc(const char *relationName, int natts,
FormData_pg_attribute *att);
static void formrdesc(const char *relationName, Oid relationReltype,
bool hasoids, int natts, FormData_pg_attribute *att);
static HeapTuple ScanPgRelation(RelationBuildDescInfo buildinfo, bool indexOK);
static Relation AllocateRelationDesc(Relation relation, Form_pg_class relp);
@ -1265,16 +1265,15 @@ LookupOpclassInfo(Oid operatorClassOid,
* NOTE: we assume we are already switched into CacheMemoryContext.
*/
static void
formrdesc(const char *relationName,
int natts,
FormData_pg_attribute *att)
formrdesc(const char *relationName, Oid relationReltype,
bool hasoids, int natts, FormData_pg_attribute *att)
{
Relation relation;
int i;
bool has_not_null;
/*
* allocate new relation desc clear all fields of reldesc
* allocate new relation desc, clear all fields of reldesc
*/
relation = (Relation) palloc0(sizeof(RelationData));
relation->rd_targblock = InvalidBlockNumber;
@ -1306,6 +1305,7 @@ formrdesc(const char *relationName,
namestrcpy(&relation->rd_rel->relname, relationName);
relation->rd_rel->relnamespace = PG_CATALOG_NAMESPACE;
relation->rd_rel->reltype = relationReltype;
/*
* It's important to distinguish between shared and non-shared
@ -1318,7 +1318,7 @@ formrdesc(const char *relationName,
relation->rd_rel->relpages = 1;
relation->rd_rel->reltuples = 1;
relation->rd_rel->relkind = RELKIND_RELATION;
relation->rd_rel->relhasoids = true;
relation->rd_rel->relhasoids = hasoids;
relation->rd_rel->relnatts = (int16) natts;
/*
@ -1327,12 +1327,10 @@ formrdesc(const char *relationName,
* Unlike the case with the relation tuple, this data had better be right
* because it will never be replaced. The input values must be
* correctly defined by macros in src/include/catalog/ headers.
*
* Note however that rd_att's tdtypeid, tdtypmod, tdhasoid fields are not
* right at this point. They will be fixed later when the real
* pg_class row is loaded.
*/
relation->rd_att = CreateTemplateTupleDesc(natts, false);
relation->rd_att = CreateTemplateTupleDesc(natts, hasoids);
relation->rd_att->tdtypeid = relationReltype;
relation->rd_att->tdtypmod = -1; /* unnecessary, but... */
/*
* initialize tuple desc info
@ -1380,10 +1378,12 @@ formrdesc(const char *relationName,
/*
* initialize the rel-has-index flag, using hardwired knowledge
*/
relation->rd_rel->relhasindex = false;
/* In bootstrap mode, we have no indexes */
if (!IsBootstrapProcessingMode())
if (IsBootstrapProcessingMode())
{
/* In bootstrap mode, we have no indexes */
relation->rd_rel->relhasindex = false;
}
else
{
/* Otherwise, all the rels formrdesc is used for have indexes */
relation->rd_rel->relhasindex = true;
@ -2348,14 +2348,14 @@ RelationCacheInitialize(void)
if (IsBootstrapProcessingMode() ||
!load_relcache_init_file())
{
formrdesc(RelationRelationName,
Natts_pg_class, Desc_pg_class);
formrdesc(AttributeRelationName,
Natts_pg_attribute, Desc_pg_attribute);
formrdesc(ProcedureRelationName,
Natts_pg_proc, Desc_pg_proc);
formrdesc(TypeRelationName,
Natts_pg_type, Desc_pg_type);
formrdesc(RelationRelationName, PG_CLASS_RELTYPE_OID,
true, Natts_pg_class, Desc_pg_class);
formrdesc(AttributeRelationName, PG_ATTRIBUTE_RELTYPE_OID,
false, Natts_pg_attribute, Desc_pg_attribute);
formrdesc(ProcedureRelationName, PG_PROC_RELTYPE_OID,
true, Natts_pg_proc, Desc_pg_proc);
formrdesc(TypeRelationName, PG_TYPE_RELTYPE_OID,
true, Natts_pg_type, Desc_pg_type);
#define NUM_CRITICAL_RELS 4 /* fix if you change list above */
}
@ -3422,16 +3422,22 @@ write_relcache_init_file(void)
/*
* OK, rename the temp file to its final name, deleting any
* previously-existing init file.
*
* Note: a failure here is possible under Cygwin, if some other
* backend is holding open an unlinked-but-not-yet-gone init file.
* So treat this as a noncritical failure; just remove the useless
* temp file on failure.
*/
rename(tempfilename, finalfilename);
LWLockRelease(RelCacheInitLock);
if (rename(tempfilename, finalfilename) < 0)
unlink(tempfilename);
}
else
{
/* Delete the already-obsolete temp file */
unlink(tempfilename);
LWLockRelease(RelCacheInitLock);
}
LWLockRelease(RelCacheInitLock);
}
/*