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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.
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@ -29,7 +29,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.110 2008/11/10 00:49:37 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.111 2008/11/19 10:34:51 heikki Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -40,6 +40,7 @@
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#include "access/genam.h"
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#include "access/heapam.h"
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#include "access/transam.h"
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#include "catalog/storage.h"
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#include "commands/dbcommands.h"
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#include "commands/vacuum.h"
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#include "miscadmin.h"
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@ -827,7 +828,6 @@ lazy_truncate_heap(Relation onerel, LVRelStats *vacrelstats)
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/*
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* Okay to truncate.
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*/
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FreeSpaceMapTruncateRel(onerel, new_rel_pages);
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RelationTruncate(onerel, new_rel_pages);
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/*
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