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Prevent re-use of a deleted relation's relfilenode until after the next

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checkpoint.  This guards against an unlikely data-loss scenario in which
we re-use the relfilenode, then crash, then replay the deletion and
recreation of the file.  Even then we'd be OK if all insertions into the
new relation had been WAL-logged ... but that's not guaranteed given all
the no-WAL-logging optimizations that have recently been added.

Patch by Heikki Linnakangas, per a discussion last month.
This commit is contained in:
Tom Lane
2007-11-15 20:36:40 +00:00
parent 7a550cb95c
commit 6cc4451b5c
5 changed files with 274 additions and 25 deletions
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6
src/include/storage/smgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.59 2007/09/05 18:10:48 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.60 2007/11/15 20:36:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -83,7 +83,9 @@ extern void AtSubAbort_smgr(void);
extern void PostPrepare_smgr(void);
extern void smgrcommit(void);
extern void smgrabort(void);
extern void smgrpreckpt(void);
extern void smgrsync(void);
extern void smgrpostckpt(void);
extern void smgr_redo(XLogRecPtr lsn, XLogRecord *record);
extern void smgr_desc(StringInfo buf, uint8 xl_info, char *rec);
@@ -104,7 +106,9 @@ extern void mdwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer,
extern BlockNumber mdnblocks(SMgrRelation reln);
extern void mdtruncate(SMgrRelation reln, BlockNumber nblocks, bool isTemp);
extern void mdimmedsync(SMgrRelation reln);
extern void mdpreckpt(void);
extern void mdsync(void);
extern void mdpostckpt(void);
extern void RememberFsyncRequest(RelFileNode rnode, BlockNumber segno);
extern void ForgetRelationFsyncRequests(RelFileNode rnode);