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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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41
src/backend/access/transam/xlogutils.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.28 2003/12/14 00:34:47 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.29 2004/02/10 01:55:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -261,14 +261,12 @@ _xl_remove_hash_entry(XLogRelDesc *rdesc)
if (hentry == NULL)
elog(PANIC, "_xl_remove_hash_entry: file was not found in cache");
if (rdesc->reldata.rd_fd >= 0)
smgrclose(DEFAULT_SMGR, &(rdesc->reldata));
if (rdesc->reldata.rd_smgr != NULL)
smgrclose(rdesc->reldata.rd_smgr);
memset(rdesc, 0, sizeof(XLogRelDesc));
memset(tpgc, 0, sizeof(FormData_pg_class));
rdesc->reldata.rd_rel = tpgc;
return;
}
static XLogRelDesc *
@ -296,7 +294,6 @@ _xl_new_reldesc(void)
void
XLogInitRelationCache(void)
{
CreateDummyCaches();
_xl_init_rel_cache();
}
@ -306,8 +303,6 @@ XLogCloseRelationCache(void)
HASH_SEQ_STATUS status;
XLogRelCacheEntry *hentry;
DestroyDummyCaches();
if (!_xlrelarr)
return;
@ -347,11 +342,18 @@ XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode)
sprintf(RelationGetRelationName(&(res->reldata)), "%u", rnode.relNode);
/* unexisting DB id */
res->reldata.rd_lockInfo.lockRelId.dbId = RecoveryDb;
res->reldata.rd_lockInfo.lockRelId.relId = rnode.relNode;
res->reldata.rd_node = rnode;
/*
* We set up the lockRelId in case anything tries to lock the dummy
* relation. Note that this is fairly bogus since relNode may be
* different from the relation's OID. It shouldn't really matter
* though, since we are presumably running by ourselves and can't
* have any lock conflicts ...
*/
res->reldata.rd_lockInfo.lockRelId.dbId = rnode.tblNode;
res->reldata.rd_lockInfo.lockRelId.relId = rnode.relNode;
hentry = (XLogRelCacheEntry *)
hash_search(_xlrelcache, (void *) &rnode, HASH_ENTER, &found);
@ -364,9 +366,17 @@ XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode)
hentry->rdesc = res;
res->reldata.rd_targblock = InvalidBlockNumber;
res->reldata.rd_fd = -1;
res->reldata.rd_fd = smgropen(DEFAULT_SMGR, &(res->reldata),
true /* allow failure */ );
res->reldata.rd_smgr = smgropen(res->reldata.rd_node);
/*
* Create the target file if it doesn't already exist. This lets
* us cope if the replay sequence contains writes to a relation
* that is later deleted. (The original coding of this routine
* would instead return NULL, causing the writes to be suppressed.
* But that seems like it risks losing valuable data if the filesystem
* loses an inode during a crash. Better to write the data until we
* are actually told to delete the file.)
*/
smgrcreate(res->reldata.rd_smgr, res->reldata.rd_istemp, true);
}
res->moreRecently = &(_xlrelarr[0]);
@ -374,8 +384,5 @@ XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode)
_xlrelarr[0].lessRecently = res;
res->lessRecently->moreRecently = res;
if (res->reldata.rd_fd < 0) /* file doesn't exist */
return (NULL);
return (&(res->reldata));
}