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Refactor XLogOpenRelation() and XLogReadBuffer() in preparation for relation

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forks. XLogOpenRelation() and the associated light-weight relation cache in
xlogutils.c is gone, and XLogReadBuffer() now takes a RelFileNode as argument,
instead of Relation.

For functions that still need a Relation struct during WAL replay, there's a
new function called CreateFakeRelcacheEntry() that returns a fake entry like
XLogOpenRelation() used to.
This commit is contained in:
Heikki Linnakangas
2008-06-12 09:12:31 +00:00
parent c4f2a0458d
commit a213f1ee6c
20 changed files with 295 additions and 427 deletions
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26
src/backend/utils/init/flatfiles.c
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@@ -23,7 +23,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.34 2008/05/12 00:00:52 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.35 2008/06/12 09:12:31 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -704,12 +704,6 @@ BuildFlatFiles(bool database_only)
rel_authid,
rel_authmem;
/*
* We don't have any hope of running a real relcache, but we can use the
* same fake-relcache facility that WAL replay uses.
*/
XLogInitRelationCache();
/* Need a resowner to keep the heapam and buffer code happy */
owner = ResourceOwnerCreate(NULL, "BuildFlatFiles");
CurrentResourceOwner = owner;
@@ -719,9 +713,15 @@ BuildFlatFiles(bool database_only)
rnode.dbNode = 0;
rnode.relNode = DatabaseRelationId;
/* No locking is needed because no one else is alive yet */
rel_db = XLogOpenRelation(rnode);
/*
* We don't have any hope of running a real relcache, but we can use the
* same fake-relcache facility that WAL replay uses.
*
* No locking is needed because no one else is alive yet.
*/
rel_db = CreateFakeRelcacheEntry(rnode);
write_database_file(rel_db, true);
FreeFakeRelcacheEntry(rel_db);
if (!database_only)
{
@@ -729,21 +729,21 @@ BuildFlatFiles(bool database_only)
rnode.spcNode = GLOBALTABLESPACE_OID;
rnode.dbNode = 0;
rnode.relNode = AuthIdRelationId;
rel_authid = XLogOpenRelation(rnode);
rel_authid = CreateFakeRelcacheEntry(rnode);
/* hard-wired path to pg_auth_members */
rnode.spcNode = GLOBALTABLESPACE_OID;
rnode.dbNode = 0;
rnode.relNode = AuthMemRelationId;
rel_authmem = XLogOpenRelation(rnode);
rel_authmem = CreateFakeRelcacheEntry(rnode);
write_auth_file(rel_authid, rel_authmem);
FreeFakeRelcacheEntry(rel_authid);
FreeFakeRelcacheEntry(rel_authmem);
}
CurrentResourceOwner = NULL;
ResourceOwnerDelete(owner);
XLogCloseRelationCache();
}