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First non-stub implementation of shared free space map. It's not super

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useful as yet, since its primary source of information is (full) VACUUM,
which makes a concerted effort to get rid of free space before telling
the map about it ... next stop is concurrent VACUUM ...
This commit is contained in:
Tom Lane
2001-07-02 20:50:46 +00:00
parent 755e367cb2
commit 42748087c1
6 changed files with 994 additions and 39 deletions
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12
src/backend/storage/smgr/smgr.c
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.51 2001/06/29 21:08:24 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/smgr.c,v 1.52 2001/07/02 20:50:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -469,11 +469,13 @@ smgrtruncate(int16 which, Relation reln, BlockNumber nblocks)
if (smgrsw[which].smgr_truncate)
{
/*
* Tell the free space map to forget this relation, so that it
* stops caching info about the deleted blocks. XXX perhaps
* tell it to forget only info about blocks beyond nblocks?
* Tell the free space map to forget anything it may have stored
* for the about-to-be-deleted blocks. We want to be sure it won't
* return bogus block numbers later on.
*/
FreeSpaceMapForgetRel(&reln->rd_node);
MultiRecordFreeSpace(&reln->rd_node,
nblocks, MaxBlockNumber,
0, NULL, NULL);
newblks = (*(smgrsw[which].smgr_truncate)) (reln, nblocks);
if (newblks == InvalidBlockNumber)