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Postgres FD Implementation
Commit 9858a8c8 authored by Heikki Linnakangas's avatar Heikki Linnakangas
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Rely on relcache invalidation to update the cached size of the FSM.

parent df559de9
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Showing with 39 additions and 36 deletions
src/backend/access/transam/xlogutils.c
View file @ 9858a8c8
......@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.63 2008/11/19 10:34:50 heikki Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.64 2008/11/26 17:08:57 heikki Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -376,7 +376,7 @@ CreateFakeRelcacheEntry(RelFileNode rnode)
rel->rd_lockInfo.lockRelId.relId = rnode.relNode;
rel->rd_targblock = InvalidBlockNumber;
rel->rd_fsm_nblocks_cache = InvalidBlockNumber;
rel->rd_fsm_nblocks = InvalidBlockNumber;
rel->rd_smgr = NULL;
return rel;
......
src/backend/storage/freespace/freespace.c
View file @ 9858a8c8
......@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.67 2008/11/19 10:34:52 heikki Exp $
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.68 2008/11/26 17:08:57 heikki Exp $
*
*
* NOTES:
......@@ -101,7 +101,7 @@ static BlockNumber fsm_get_heap_blk(FSMAddress addr, uint16 slot);
static BlockNumber fsm_logical_to_physical(FSMAddress addr);
static Buffer fsm_readbuf(Relation rel, FSMAddress addr, bool extend);
static void fsm_extend(Relation rel, BlockNumber nfsmblocks, bool createstorage);
static void fsm_extend(Relation rel, BlockNumber fsm_nblocks);
/* functions to convert amount of free space to a FSM category */
static uint8 fsm_space_avail_to_cat(Size avail);
......@@ -303,13 +303,13 @@ FreeSpaceMapTruncateRel(Relation rel, BlockNumber nblocks)
smgrtruncate(rel->rd_smgr, FSM_FORKNUM, new_nfsmblocks, rel->rd_istemp);
/*
* Need to invalidate the relcache entry, because rd_fsm_nblocks_cache
* Need to invalidate the relcache entry, because rd_fsm_nblocks
* seen by other backends is no longer valid.
*/
if (!InRecovery)
CacheInvalidateRelcache(rel);
rel->rd_fsm_nblocks_cache = new_nfsmblocks;
rel->rd_fsm_nblocks = new_nfsmblocks;
}
/*
......@@ -503,19 +503,20 @@ fsm_readbuf(Relation rel, FSMAddress addr, bool extend)
RelationOpenSmgr(rel);
if (rel->rd_fsm_nblocks_cache == InvalidBlockNumber ||
rel->rd_fsm_nblocks_cache <= blkno)
/* If we haven't cached the size of the FSM yet, check it first */
if (rel->rd_fsm_nblocks == InvalidBlockNumber)
{
if (!smgrexists(rel->rd_smgr, FSM_FORKNUM))
fsm_extend(rel, blkno + 1, true);
if (smgrexists(rel->rd_smgr, FSM_FORKNUM))
rel->rd_fsm_nblocks = smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
else
rel->rd_fsm_nblocks_cache = smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
rel->rd_fsm_nblocks = 0;
}
if (blkno >= rel->rd_fsm_nblocks_cache)
/* Handle requests beyond EOF */
if (blkno >= rel->rd_fsm_nblocks)
{
if (extend)
fsm_extend(rel, blkno + 1, false);
fsm_extend(rel, blkno + 1);
else
return InvalidBuffer;
}
......@@ -536,13 +537,12 @@ fsm_readbuf(Relation rel, FSMAddress addr, bool extend)
/*
* Ensure that the FSM fork is at least n_fsmblocks long, extending
* it if necessary with empty pages. And by empty, I mean pages filled
* with zeros, meaning there's no free space. If createstorage is true,
* the FSM file might need to be created first.
* with zeros, meaning there's no free space.
*/
static void
fsm_extend(Relation rel, BlockNumber n_fsmblocks, bool createstorage)
fsm_extend(Relation rel, BlockNumber fsm_nblocks)
{
BlockNumber n_fsmblocks_now;
BlockNumber fsm_nblocks_now;
Page pg;
pg = (Page) palloc(BLCKSZ);
......@@ -561,27 +561,30 @@ fsm_extend(Relation rel, BlockNumber n_fsmblocks, bool createstorage)
LockRelationForExtension(rel, ExclusiveLock);
/* Create the FSM file first if it doesn't exist */
if (createstorage && !smgrexists(rel->rd_smgr, FSM_FORKNUM))
if ((rel->rd_fsm_nblocks == 0 || rel->rd_fsm_nblocks == InvalidBlockNumber)
&& !smgrexists(rel->rd_smgr, FSM_FORKNUM))
{
smgrcreate(rel->rd_smgr, FSM_FORKNUM, false);
n_fsmblocks_now = 0;
fsm_nblocks_now = 0;
}
else
n_fsmblocks_now = smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
fsm_nblocks_now = smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
while (n_fsmblocks_now < n_fsmblocks)
while (fsm_nblocks_now < fsm_nblocks)
{
smgrextend(rel->rd_smgr, FSM_FORKNUM, n_fsmblocks_now,
smgrextend(rel->rd_smgr, FSM_FORKNUM, fsm_nblocks_now,
(char *) pg, rel->rd_istemp);
n_fsmblocks_now++;
fsm_nblocks_now++;
}
UnlockRelationForExtension(rel, ExclusiveLock);
pfree(pg);
/* update the cache with the up-to-date size */
rel->rd_fsm_nblocks_cache = n_fsmblocks_now;
/* Update the relcache with the up-to-date size */
if (!InRecovery)
CacheInvalidateRelcache(rel);
rel->rd_fsm_nblocks = fsm_nblocks_now;
}
/*
......
src/backend/utils/cache/relcache.c
View file @ 9858a8c8
......@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.276 2008/11/10 00:49:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.277 2008/11/26 17:08:57 heikki Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -304,7 +304,7 @@ AllocateRelationDesc(Relation relation, Form_pg_class relp)
*/
MemSet(relation, 0, sizeof(RelationData));
relation->rd_targblock = InvalidBlockNumber;
relation->rd_fsm_nblocks_cache = InvalidBlockNumber;
relation->rd_fsm_nblocks = InvalidBlockNumber;
/* make sure relation is marked as having no open file yet */
relation->rd_smgr = NULL;
......@@ -1376,7 +1376,7 @@ formrdesc(const char *relationName, Oid relationReltype,
*/
relation = (Relation) palloc0(sizeof(RelationData));
relation->rd_targblock = InvalidBlockNumber;
relation->rd_fsm_nblocks_cache = InvalidBlockNumber;
relation->rd_fsm_nblocks = InvalidBlockNumber;
/* make sure relation is marked as having no open file yet */
relation->rd_smgr = NULL;
......@@ -1665,9 +1665,9 @@ RelationReloadIndexInfo(Relation relation)
heap_freetuple(pg_class_tuple);
/* We must recalculate physical address in case it changed */
RelationInitPhysicalAddr(relation);
/* Must reset targblock and fsm_nblocks_cache in case rel was truncated */
/* Must reset targblock and fsm_nblocks in case rel was truncated */
relation->rd_targblock = InvalidBlockNumber;
relation->rd_fsm_nblocks_cache = InvalidBlockNumber;
relation->rd_fsm_nblocks = InvalidBlockNumber;
/* Must free any AM cached data, too */
if (relation->rd_amcache)
pfree(relation->rd_amcache);
......@@ -1750,7 +1750,7 @@ RelationClearRelation(Relation relation, bool rebuild)
if (relation->rd_isnailed)
{
relation->rd_targblock = InvalidBlockNumber;
relation->rd_fsm_nblocks_cache = InvalidBlockNumber;
relation->rd_fsm_nblocks = InvalidBlockNumber;
if (relation->rd_rel->relkind == RELKIND_INDEX)
{
relation->rd_isvalid = false; /* needs to be revalidated */
......@@ -2345,7 +2345,7 @@ RelationBuildLocalRelation(const char *relname,
rel = (Relation) palloc0(sizeof(RelationData));
rel->rd_targblock = InvalidBlockNumber;
rel->rd_fsm_nblocks_cache = InvalidBlockNumber;
rel->rd_fsm_nblocks = InvalidBlockNumber;
/* make sure relation is marked as having no open file yet */
rel->rd_smgr = NULL;
......@@ -3602,7 +3602,7 @@ load_relcache_init_file(void)
*/
rel->rd_smgr = NULL;
rel->rd_targblock = InvalidBlockNumber;
rel->rd_fsm_nblocks_cache = InvalidBlockNumber;
rel->rd_fsm_nblocks = InvalidBlockNumber;
if (rel->rd_isnailed)
rel->rd_refcnt = 1;
else
......
src/include/utils/rel.h
View file @ 9858a8c8
......@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.108 2008/09/30 10:52:14 heikki Exp $
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.109 2008/11/26 17:08:58 heikki Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -195,8 +195,8 @@ typedef struct RelationData
List *rd_indpred; /* index predicate tree, if any */
void *rd_amcache; /* available for use by index AM */
/* Cached last-seen size of the FSM */
BlockNumber rd_fsm_nblocks_cache;
/* size of the FSM, or InvalidBlockNumber if not known yet */
BlockNumber rd_fsm_nblocks;
/* use "struct" here to avoid needing to include pgstat.h: */
struct PgStat_TableStatus *pgstat_info; /* statistics collection area */
......
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