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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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21
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.270 2008/11/14 01:57:41 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.271 2008/11/19 10:34:51 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -35,6 +35,7 @@
#include "catalog/pg_trigger.h"
#include "catalog/pg_type.h"
#include "catalog/pg_type_fn.h"
#include "catalog/storage.h"
#include "catalog/toasting.h"
#include "commands/cluster.h"
#include "commands/defrem.h"
@ -6567,22 +6568,26 @@ ATExecSetTableSpace(Oid tableOid, Oid newTableSpace)
* of old physical files.
*
* NOTE: any conflict in relfilenode value will be caught in
* smgrcreate() below.
* RelationCreateStorage().
*/
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
RelationCreateStorage(newrnode, rel->rd_istemp);
/* copy main fork */
copy_relation_data(rel->rd_smgr, dstrel, MAIN_FORKNUM, rel->rd_istemp);
/* copy those extra forks that exist */
for (forkNum = MAIN_FORKNUM + 1; forkNum <= MAX_FORKNUM; forkNum++)
{
if (smgrexists(rel->rd_smgr, forkNum))
{
smgrcreate(dstrel, forkNum, rel->rd_istemp, false);
smgrcreate(dstrel, forkNum, false);
copy_relation_data(rel->rd_smgr, dstrel, forkNum, rel->rd_istemp);
smgrscheduleunlink(rel->rd_smgr, forkNum, rel->rd_istemp);
}
}
/* Close old and new relation */
/* drop old relation, and close new one */
RelationDropStorage(rel);
smgrclose(dstrel);
RelationCloseSmgr(rel);
/* update the pg_class row */
rd_rel->reltablespace = (newTableSpace == MyDatabaseTableSpace) ? InvalidOid : newTableSpace;