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Restructure smgr API as per recent proposal. smgr no longer depends on

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the relcache, and so the notion of 'blind write' is gone.  This should
improve efficiency in bgwriter and background checkpoint processes.
Internal restructuring in md.c to remove the not-very-useful array of
MdfdVec objects --- might as well just use pointers.
Also remove the long-dead 'persistent main memory' storage manager (mm.c),
since it seems quite unlikely to ever get resurrected.
This commit is contained in:
Tom Lane
2004-02-10 01:55:27 +00:00
parent f06e79525a
commit 87bd956385
37 changed files with 933 additions and 1776 deletions
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30
src/backend/storage/buffer/localbuf.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.51 2004/01/07 18:56:27 neilc Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.52 2004/02/10 01:55:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -90,24 +90,15 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
*/
if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
{
Relation bufrel = RelationNodeCacheGetRelation(bufHdr->tag.rnode);
SMgrRelation reln;
/* flush this page */
if (bufrel == NULL)
{
smgrblindwrt(DEFAULT_SMGR,
bufHdr->tag.rnode,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data));
}
else
{
smgrwrite(DEFAULT_SMGR, bufrel,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data));
/* drop refcount incremented by RelationNodeCacheGetRelation */
RelationDecrementReferenceCount(bufrel);
}
/* Find smgr relation for buffer */
reln = smgropen(bufHdr->tag.rnode);
/* And write... */
smgrwrite(reln,
bufHdr->tag.blockNum,
(char *) MAKE_PTR(bufHdr->data));
LocalBufferFlushCount++;
}
@ -143,9 +134,6 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
/*
* it's all ours now.
*
* We need not in tblNode currently but will in future I think, when
* we'll give up rel->rd_fd to fmgr cache.
*/
bufHdr->tag.rnode = reln->rd_node;
bufHdr->tag.blockNum = blockNum;