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Rethink the way FSM truncation works. Instead of WAL-logging FSM

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truncations in FSM code, call FreeSpaceMapTruncateRel from smgr_redo. To
make that cleaner from modularity point of view, move the WAL-logging one
level up to RelationTruncate, and move RelationTruncate and all the
related WAL-logging to new src/backend/catalog/storage.c file. Introduce
new RelationCreateStorage and RelationDropStorage functions that are used
instead of calling smgrcreate/smgrscheduleunlink directly. Move the
pending rel deletion stuff from smgrcreate/smgrscheduleunlink to the new
functions. This leaves smgr.c as a thin wrapper around md.c; all the
transactional stuff is now in storage.c.

This will make it easier to add new forks with similar truncation logic,
like the visibility map.
This commit is contained in:
Heikki Linnakangas
2008-11-19 10:34:52 +00:00
parent 26e6c896c9
commit 3396000684
30 changed files with 675 additions and 794 deletions
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5
src/backend/commands/vacuum.c
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@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.380 2008/11/10 00:49:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.381 2008/11/19 10:34:51 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -31,6 +31,7 @@
#include "catalog/namespace.h"
#include "catalog/pg_database.h"
#include "catalog/pg_namespace.h"
#include "catalog/storage.h"
#include "commands/dbcommands.h"
#include "commands/vacuum.h"
#include "executor/executor.h"
@@ -2863,7 +2864,6 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
/* Truncate relation, if needed */
if (blkno < nblocks)
{
FreeSpaceMapTruncateRel(onerel, blkno);
RelationTruncate(onerel, blkno);
vacrelstats->rel_pages = blkno; /* set new number of blocks */
}
@@ -3258,7 +3258,6 @@ vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages)
(errmsg("\"%s\": truncated %u to %u pages",
RelationGetRelationName(onerel),
vacrelstats->rel_pages, relblocks)));
FreeSpaceMapTruncateRel(onerel, relblocks);
RelationTruncate(onerel, relblocks);
vacrelstats->rel_pages = relblocks; /* set new number of blocks */
}