*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/catalog/index.c,v 1.199 2002/09/22 23:03:58 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/catalog/index.c,v 1.200 2002/09/23 00:42:48 tgl Exp $
*
*
* INTERFACE ROUTINES
}
-/* --------------------------------------------
- * Lock class info for update
- * --------------------------------------------
- */
-static bool
-LockClassinfoForUpdate(Oid relid, HeapTuple rtup,
- Buffer *buffer, bool confirmCommitted)
-{
- HeapTuple classTuple;
- bool test;
- Relation relationRelation;
-
- /*
- * NOTE: get and hold RowExclusiveLock on pg_class, because caller
- * will probably modify the rel's pg_class tuple later on.
- */
- relationRelation = heap_openr(RelationRelationName, RowExclusiveLock);
- classTuple = SearchSysCache(RELOID, PointerGetDatum(relid),
- 0, 0, 0);
- if (!HeapTupleIsValid(classTuple))
- {
- heap_close(relationRelation, NoLock);
- return false;
- }
- rtup->t_self = classTuple->t_self;
- ReleaseSysCache(classTuple);
-
- while (1)
- {
- ItemPointerData tidsave;
-
- ItemPointerCopy(&(rtup->t_self), &tidsave);
- test = heap_mark4update(relationRelation, rtup, buffer,
- GetCurrentCommandId());
- switch (test)
- {
- case HeapTupleSelfUpdated:
- case HeapTupleMayBeUpdated:
- break;
- case HeapTupleUpdated:
- ReleaseBuffer(*buffer);
- if (!ItemPointerEquals(&(rtup->t_self), &tidsave))
- continue;
- default:
- elog(ERROR, "LockClassinfoForUpdate couldn't lock relid %u", relid);
- return false;
- }
- break;
- }
- CacheInvalidateHeapTuple(relationRelation, rtup);
- if (confirmCommitted)
- {
- HeapTupleHeader th = rtup->t_data;
-
- if (!(th->t_infomask & HEAP_XMIN_COMMITTED))
- elog(ERROR, "The tuple isn't committed");
- if (th->t_infomask & HEAP_XMAX_COMMITTED)
- if (!(th->t_infomask & HEAP_MARKED_FOR_UPDATE))
- elog(ERROR, "The tuple is already deleted");
- }
- heap_close(relationRelation, NoLock);
- return true;
-}
-
/* ---------------------------------------------
* Indexes of the relation active ?
+ *
+ * Caller must hold an adequate lock on the relation to ensure the
+ * answer won't be changing.
* ---------------------------------------------
*/
bool
-IndexesAreActive(Oid relid, bool confirmCommitted)
+IndexesAreActive(Relation heaprel)
{
- HeapTupleData tuple;
+ bool isactive;
Relation indexRelation;
- Buffer buffer;
HeapScanDesc scan;
ScanKeyData entry;
- bool isactive;
- if (!LockClassinfoForUpdate(relid, &tuple, &buffer, confirmCommitted))
- elog(ERROR, "IndexesAreActive couldn't lock %u", relid);
- if (((Form_pg_class) GETSTRUCT(&tuple))->relkind != RELKIND_RELATION &&
- ((Form_pg_class) GETSTRUCT(&tuple))->relkind != RELKIND_TOASTVALUE)
- elog(ERROR, "relation %u isn't an indexable relation", relid);
- isactive = ((Form_pg_class) GETSTRUCT(&tuple))->relhasindex;
- ReleaseBuffer(buffer);
+ if (heaprel->rd_rel->relkind != RELKIND_RELATION &&
+ heaprel->rd_rel->relkind != RELKIND_TOASTVALUE)
+ elog(ERROR, "relation %s isn't an indexable relation",
+ RelationGetRelationName(heaprel));
+
+ /* If pg_class.relhasindex is set, indexes are active */
+ isactive = heaprel->rd_rel->relhasindex;
if (isactive)
return isactive;
+
+ /* Otherwise, look to see if there are any indexes */
indexRelation = heap_openr(IndexRelationName, AccessShareLock);
- ScanKeyEntryInitialize(&entry, 0, Anum_pg_index_indrelid,
- F_OIDEQ, ObjectIdGetDatum(relid));
+ ScanKeyEntryInitialize(&entry, 0,
+ Anum_pg_index_indrelid, F_OIDEQ,
+ ObjectIdGetDatum(RelationGetRelid(heaprel)));
scan = heap_beginscan(indexRelation, SnapshotNow, 1, &entry);
if (heap_getnext(scan, ForwardScanDirection) == NULL)
isactive = true; /* no indexes, so report "active" */
heap_close(pg_class, RowExclusiveLock);
}
+/*
+ * setNewRelfilenode - assign a new relfilenode value to the relation
+ *
+ * Caller must already hold exclusive lock on the relation.
+ */
void
setNewRelfilenode(Relation relation)
{
- Relation pg_class;
Oid newrelfilenode;
- bool in_place_update = false;
- HeapTupleData lockTupleData;
- HeapTuple classTuple = NULL;
- Buffer buffer;
+ Relation pg_class;
+ HeapTuple tuple;
+ Form_pg_class rd_rel;
+ HeapScanDesc pg_class_scan = NULL;
+ bool in_place_upd;
RelationData workrel;
Assert(!IsSystemRelation(relation) || IsToastRelation(relation) ||
relation->rd_rel->relkind == RELKIND_INDEX);
- pg_class = heap_openr(RelationRelationName, RowExclusiveLock);
- /* Fetch and lock the classTuple associated with this relation */
- if (!LockClassinfoForUpdate(relation->rd_id, &lockTupleData, &buffer, true))
- elog(ERROR, "setNewRelfilenode impossible to lock class tuple");
- if (IsIgnoringSystemIndexes())
- in_place_update = true;
/* Allocate a new relfilenode */
newrelfilenode = newoid();
- /* update pg_class tuple with new relfilenode */
- if (!in_place_update)
+
+ /*
+ * Find the RELATION relation tuple for the given relation.
+ */
+ pg_class = heap_openr(RelationRelationName, RowExclusiveLock);
+
+ in_place_upd = IsIgnoringSystemIndexes();
+
+ if (!in_place_upd)
{
- classTuple = heap_copytuple(&lockTupleData);
- ReleaseBuffer(buffer);
- ((Form_pg_class) GETSTRUCT(classTuple))->relfilenode = newrelfilenode;
- simple_heap_update(pg_class, &classTuple->t_self, classTuple);
+ tuple = SearchSysCacheCopy(RELOID,
+ ObjectIdGetDatum(RelationGetRelid(relation)),
+ 0, 0, 0);
}
+ else
+ {
+ ScanKeyData key[1];
+
+ ScanKeyEntryInitialize(&key[0], 0,
+ ObjectIdAttributeNumber,
+ F_OIDEQ,
+ ObjectIdGetDatum(RelationGetRelid(relation)));
+
+ pg_class_scan = heap_beginscan(pg_class, SnapshotNow, 1, key);
+ tuple = heap_getnext(pg_class_scan, ForwardScanDirection);
+ }
+
+ if (!HeapTupleIsValid(tuple))
+ elog(ERROR, "setNewRelfilenode: cannot find relation %u in pg_class",
+ RelationGetRelid(relation));
+ rd_rel = (Form_pg_class) GETSTRUCT(tuple);
+
/* schedule unlinking old relfilenode */
smgrunlink(DEFAULT_SMGR, relation);
+
/* create another storage file. Is it a little ugly ? */
memcpy((char *) &workrel, relation, sizeof(RelationData));
+ workrel.rd_fd = -1;
workrel.rd_node.relNode = newrelfilenode;
heap_storage_create(&workrel);
smgrclose(DEFAULT_SMGR, &workrel);
- /* update pg_class tuple with new relfilenode in place */
- if (in_place_update)
+
+ /* update the pg_class row */
+ if (in_place_upd)
{
- classTuple = &lockTupleData;
+ LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_EXCLUSIVE);
+ rd_rel->relfilenode = newrelfilenode;
+ LockBuffer(pg_class_scan->rs_cbuf, BUFFER_LOCK_UNLOCK);
+ WriteNoReleaseBuffer(pg_class_scan->rs_cbuf);
+ BufferSync();
/* Send out shared cache inval if necessary */
if (!IsBootstrapProcessingMode())
- CacheInvalidateHeapTuple(pg_class, classTuple);
- /* Update the buffer in-place */
- LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
- ((Form_pg_class) GETSTRUCT(classTuple))->relfilenode = newrelfilenode;
- LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
- WriteBuffer(buffer);
- BufferSync();
+ CacheInvalidateHeapTuple(pg_class, tuple);
+ }
+ else
+ {
+ rd_rel->relfilenode = newrelfilenode;
+ simple_heap_update(pg_class, &tuple->t_self, tuple);
+ CatalogUpdateIndexes(pg_class, tuple);
}
- /* Keep the catalog indexes up to date */
- if (!in_place_update)
- CatalogUpdateIndexes(pg_class, classTuple);
-
- heap_close(pg_class, NoLock);
- if (!in_place_update)
- heap_freetuple(classTuple);
- /* Make sure the relfilenode change */
+
+ if (!pg_class_scan)
+ heap_freetuple(tuple);
+ else
+ heap_endscan(pg_class_scan);
+
+ heap_close(pg_class, RowExclusiveLock);
+
+ /* Make sure the relfilenode change is visible */
CommandCounterIncrement();
}
Relation whichRel;
Relation pg_class;
HeapTuple tuple;
- HeapTuple newtup;
BlockNumber relpages;
Form_pg_class rd_rel;
HeapScanDesc pg_class_scan = NULL;
else
{
/* During normal processing, must work harder. */
- newtup = heap_copytuple(tuple);
- rd_rel = (Form_pg_class) GETSTRUCT(newtup);
rd_rel->relpages = (int32) relpages;
rd_rel->reltuples = (float4) reltuples;
- simple_heap_update(pg_class, &tuple->t_self, newtup);
- CatalogUpdateIndexes(pg_class, newtup);
- heap_freetuple(newtup);
+ simple_heap_update(pg_class, &tuple->t_self, tuple);
+ CatalogUpdateIndexes(pg_class, tuple);
}
}
/* Get OID of index's parent table */
heapId = iRel->rd_index->indrelid;
- /* Fetch info needed for index_build */
- indexInfo = BuildIndexInfo(iRel->rd_index);
/* Open the parent heap relation */
heapRelation = heap_open(heapId, AccessExclusiveLock);
elog(ERROR, "reindex_index: can't open heap relation");
/*
- * Force inplace processing if it's a shared index. Necessary because
- * we have no way to update relfilenode in other databases.
+ * If it's a shared index, we must do inplace processing (because we
+ * have no way to update relfilenode in other databases). Also, if
+ * it's a nailed-in-cache index, we must do inplace processing because
+ * the relcache can't cope with changing its relfilenode.
+ *
+ * In either of these cases, we are definitely processing a system
+ * index, so we'd better be ignoring system indexes.
*/
if (iRel->rd_rel->relisshared)
+ {
+ if (!IsIgnoringSystemIndexes())
+ elog(ERROR, "the target relation %u is shared", indexId);
+ inplace = true;
+ }
+ if (iRel->rd_isnailed)
+ {
+ if (!IsIgnoringSystemIndexes())
+ elog(ERROR, "the target relation %u is nailed", indexId);
inplace = true;
+ }
+
+ /* Fetch info needed for index_build */
+ indexInfo = BuildIndexInfo(iRel->rd_index);
if (inplace)
{
* ----------------------------
* activate_indexes_of_a_table
* activate/deactivate indexes of the specified table.
+ *
+ * Caller must already hold exclusive lock on the table.
* ----------------------------
*/
bool
-activate_indexes_of_a_table(Oid relid, bool activate)
+activate_indexes_of_a_table(Relation heaprel, bool activate)
{
- if (IndexesAreActive(relid, true))
+ if (IndexesAreActive(heaprel))
{
if (!activate)
- setRelhasindex(relid, false, false, InvalidOid);
+ setRelhasindex(RelationGetRelid(heaprel), false, false,
+ InvalidOid);
else
return false;
}
else
{
if (activate)
- reindex_relation(relid, false);
+ reindex_relation(RelationGetRelid(heaprel), false);
else
return false;
}
bool old,
reindexed;
bool deactivate_needed,
- overwrite,
- upd_pg_class_inplace;
+ overwrite;
Relation rel;
- overwrite = upd_pg_class_inplace = deactivate_needed = false;
-
- /*
- * avoid heap_update() pg_class tuples while processing reindex for
- * pg_class.
- */
- if (IsIgnoringSystemIndexes())
- upd_pg_class_inplace = true;
+ overwrite = deactivate_needed = false;
/*
* Ensure to hold an exclusive lock throughout the transaction. The
if (!IsIgnoringSystemIndexes() &&
IsSystemRelation(rel) && !IsToastRelation(rel))
deactivate_needed = true;
-#ifndef ENABLE_REINDEX_NAILED_RELATIONS
-
- /*
- * nailed relations are never updated. We couldn't keep the
- * consistency between the relation descriptors and pg_class tuples.
- */
- if (rel->rd_isnailed)
- {
- if (IsIgnoringSystemIndexes())
- {
- overwrite = true;
- deactivate_needed = true;
- }
- else
- elog(ERROR, "the target relation %u is nailed", relid);
- }
-#endif /* ENABLE_REINDEX_NAILED_RELATIONS */
/*
* Shared system indexes must be overwritten because it's impossible
elog(ERROR, "the target relation %u is shared", relid);
}
- /*
- * Continue to hold the lock.
- */
- heap_close(rel, NoLock);
-
old = SetReindexProcessing(true);
+
if (deactivate_needed)
{
- if (IndexesAreActive(relid, upd_pg_class_inplace))
+ if (IndexesAreActive(rel))
{
if (!force)
{
SetReindexProcessing(old);
+ heap_close(rel, NoLock);
return false;
}
- activate_indexes_of_a_table(relid, false);
+ activate_indexes_of_a_table(rel, false);
CommandCounterIncrement();
}
}
+ /*
+ * Continue to hold the lock.
+ */
+ heap_close(rel, NoLock);
+
indexRelation = heap_openr(IndexRelationName, AccessShareLock);
ScanKeyEntryInitialize(&entry, 0, Anum_pg_index_indrelid,
F_OIDEQ, ObjectIdGetDatum(relid));
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