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Commit184dd28

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This is actually more of a fundamental problem with mdtruncate. It
lookslike someone just didn't add support for multiple segments fortruncation.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 inthere) and regression is ok.Ole Gjerde
1 parent1125c5e commit184dd28

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1 file changed

+19
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  • src/backend/storage/smgr

1 file changed

+19
-8
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‎src/backend/storage/smgr/md.c

Lines changed: 19 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
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*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.42 1999/04/05 22:25:11 tgl Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.43 1999/05/17 06:38:41 momjian Exp $
1111
*
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*-------------------------------------------------------------------------
1313
*/
@@ -711,15 +711,26 @@ mdtruncate(Relation reln, int nblocks)
711711
MdfdVec*v;
712712

713713
#ifndefLET_OS_MANAGE_FILESIZE
714-
intcurnblk;
714+
intcurnblk,
715+
i,
716+
oldsegno,
717+
newsegno;
718+
charfname[NAMEDATALEN];
719+
chartname[NAMEDATALEN+10];
715720

716721
curnblk=mdnblocks(reln);
717-
if (curnblk /RELSEG_SIZE>0)
718-
{
719-
elog(NOTICE,"Can't truncate multi-segments relation %s",
720-
reln->rd_rel->relname.data);
721-
returncurnblk;
722-
}
722+
oldsegno=curnblk /RELSEG_SIZE;
723+
newsegno=nblocks /RELSEG_SIZE;
724+
725+
StrNCpy(fname,RelationGetRelationName(reln)->data,NAMEDATALEN);
726+
727+
if (newsegno<oldsegno) {
728+
for (i= (newsegno+1);;i++) {
729+
sprintf(tname,"%s.%d",fname,i);
730+
if (FileNameUnlink(tname)<0)
731+
break;
732+
}
733+
}
723734
#endif
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725736
fd=RelationGetFile(reln);

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