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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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28
src/backend/storage/freespace/indexfsm.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/freespace/indexfsm.c,v 1.2 2008/10/06 08:04:11 heikki Exp $
* $PostgreSQL: pgsql/src/backend/storage/freespace/indexfsm.c,v 1.3 2008/11/19 10:34:52 heikki Exp $
*
*
* NOTES:
@@ -30,20 +30,6 @@
* Exported routines
*/
/*
* InitIndexFreeSpaceMap - Create or reset the FSM fork for relation.
*/
void
InitIndexFreeSpaceMap(Relation rel)
{
/* Create FSM fork if it doesn't exist yet, or truncate it if it does */
RelationOpenSmgr(rel);
if (!smgrexists(rel->rd_smgr, FSM_FORKNUM))
smgrcreate(rel->rd_smgr, FSM_FORKNUM, rel->rd_istemp, false);
else
smgrtruncate(rel->rd_smgr, FSM_FORKNUM, 0, rel->rd_istemp);
}
/*
* GetFreeIndexPage - return a free page from the FSM
*
@@ -79,18 +65,6 @@ RecordUsedIndexPage(Relation rel, BlockNumber usedBlock)
RecordPageWithFreeSpace(rel, usedBlock, 0);
}
/*
* IndexFreeSpaceMapTruncate - adjust for truncation of a relation.
*
* We need to delete any stored data past the new relation length, so that
* we don't bogusly return removed block numbers.
*/
void
IndexFreeSpaceMapTruncate(Relation rel, BlockNumber nblocks)
{
FreeSpaceMapTruncateRel(rel, nblocks);
}
/*
* IndexFreeSpaceMapVacuum - scan and fix any inconsistencies in the FSM
*/