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Rethink the way FSM truncation works. Instead of WAL-logging FSM

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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.
This commit is contained in:
Heikki Linnakangas
2008-11-19 10:34:52 +00:00
parent 26e6c896c9
commit 3396000684
30 changed files with 675 additions and 794 deletions
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3
src/include/access/rmgr.h
View File

@@ -3,7 +3,7 @@
*
* Resource managers definition
*
* $PostgreSQL: pgsql/src/include/access/rmgr.h,v 1.18 2008/09/30 10:52:13 heikki Exp $
* $PostgreSQL: pgsql/src/include/access/rmgr.h,v 1.19 2008/11/19 10:34:52 heikki Exp $
*/
#ifndef RMGR_H
#define RMGR_H
@@ -23,7 +23,6 @@ typedef uint8 RmgrId;
#define RM_DBASE_ID 4
#define RM_TBLSPC_ID 5
#define RM_MULTIXACT_ID 6
#define RM_FREESPACE_ID 7
#define RM_HEAP2_ID 9
#define RM_HEAP_ID 10
#define RM_BTREE_ID 11

14
src/include/access/xact.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.95 2008/08/11 11:05:11 heikki Exp $
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.96 2008/11/19 10:34:52 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -88,10 +88,10 @@ typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid,
typedef struct xl_xact_commit
{
TimestampTz xact_time; /* time of commit */
int nrels; /* number of RelFileForks */
int nrels; /* number of RelFileNodes */
int nsubxacts; /* number of subtransaction XIDs */
/* Array of RelFileFork(s) to drop at commit */
RelFileFork xnodes[1]; /* VARIABLE LENGTH ARRAY */
/* Array of RelFileNode(s) to drop at commit */
RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
/* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */
} xl_xact_commit;
@@ -100,10 +100,10 @@ typedef struct xl_xact_commit
typedef struct xl_xact_abort
{
TimestampTz xact_time; /* time of abort */
int nrels; /* number of RelFileForks */
int nrels; /* number of RelFileNodes */
int nsubxacts; /* number of subtransaction XIDs */
/* Array of RelFileFork(s) to drop at abort */
RelFileFork xnodes[1]; /* VARIABLE LENGTH ARRAY */
/* Array of RelFileNode(s) to drop at abort */
RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
/* ARRAY OF ABORTED SUBTRANSACTION XIDs FOLLOWS */
} xl_xact_abort;