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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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24
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.241 2008/11/11 13:19:16 heikki Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.242 2008/11/19 10:34:52 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -1695,8 +1695,6 @@ void
BufmgrCommit(void)
{
/* Nothing to do in bufmgr anymore... */
smgrcommit();
}
/*
@ -1848,26 +1846,6 @@ RelationGetNumberOfBlocks(Relation relation)
return smgrnblocks(relation->rd_smgr, MAIN_FORKNUM);
}
/*
* RelationTruncate
* Physically truncate a relation to the specified number of blocks.
*
* As of Postgres 8.1, this includes getting rid of any buffers for the
* blocks that are to be dropped; previously, callers had to do that.
*/
void
RelationTruncate(Relation rel, BlockNumber nblocks)
{
/* Open it at the smgr level if not already done */
RelationOpenSmgr(rel);
/* Make sure rd_targblock isn't pointing somewhere past end */
rel->rd_targblock = InvalidBlockNumber;
/* Do the real work */
smgrtruncate(rel->rd_smgr, MAIN_FORKNUM, nblocks, rel->rd_istemp);
}
/* ---------------------------------------------------------------------
* DropRelFileNodeBuffers
*