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

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

View File

@ -29,7 +29,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.110 2008/11/10 00:49:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.111 2008/11/19 10:34:51 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -40,6 +40,7 @@
#include "access/genam.h"
#include "access/heapam.h"
#include "access/transam.h"
#include "catalog/storage.h"
#include "commands/dbcommands.h"
#include "commands/vacuum.h"
#include "miscadmin.h"
@ -827,7 +828,6 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
/*
* Okay to truncate.
*/
FreeSpaceMapTruncateRel(onerel, new_rel_pages);
RelationTruncate(onerel, new_rel_pages);
/*