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This is actually more of a fundamental problem with mdtruncate. It 

looks
like someone just didn't add support for multiple segments for
truncation.

The following patch seems to do the right thing, for me at least.
It passed my tests, my data looks right(no data that shouldn't be in
there) and regression is ok.

Ole Gjerde
This commit is contained in:
Bruce Momjian 1999-05-17 06:38:41 +00:00
parent 1125c5e4c5
commit 184dd28d5c
1 changed files with 19 additions and 8 deletions
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27
src/backend/storage/smgr/md.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.42 1999/04/05 22:25:11 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.43 1999/05/17 06:38:41 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -711,15 +711,26 @@ mdtruncate(Relation reln, int nblocks)
MdfdVec *v;
#ifndef LET_OS_MANAGE_FILESIZE
int curnblk;
int curnblk,
i,
oldsegno,
newsegno;
char fname[NAMEDATALEN];
char tname[NAMEDATALEN + 10];
curnblk = mdnblocks(reln);
if (curnblk / RELSEG_SIZE > 0)
{
elog(NOTICE, "Can't truncate multi-segments relation %s",
reln->rd_rel->relname.data);
return curnblk;
}
oldsegno = curnblk / RELSEG_SIZE;
newsegno = nblocks / RELSEG_SIZE;
StrNCpy(fname, RelationGetRelationName(reln)->data, NAMEDATALEN);
if (newsegno < oldsegno) {
for (i = (newsegno + 1);; i++) {
sprintf(tname, "%s.%d", fname, i);
if (FileNameUnlink(tname) < 0)
break;
}
}
#endif
fd = RelationGetFile(reln);