From 3396000684b41e7e9467d1abc67152b39e697035 Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Wed, 19 Nov 2008 10:34:52 +0000
Subject: 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.
---
 src/backend/storage/buffer/bufmgr.c | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

(limited to 'src/backend/storage/buffer/bufmgr.c')

diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index bb4b968f1c4..b7e0861e2b5 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -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
  *
-- 
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