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Patch to allow vacuum on multi-segment tables, from Hiroshi Inoue

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This commit is contained in:
Bruce Momjian 1999-06-18 16:47:23 +00:00
parent 8c3a796328
commit 0591bbd558
1 changed files with 46 additions and 12 deletions
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58
src/backend/storage/smgr/md.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.45 1999/06/11 02:39:43 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.46 1999/06/18 16:47:23 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -674,11 +674,12 @@ mdnblocks(Relation reln)
segno = 0;
for (;;)
{
if (v->mdfd_lstbcnt == RELSEG_SIZE
|| (nblocks = _mdnblocks(v->mdfd_vfd, BLCKSZ)) == RELSEG_SIZE)
nblocks = _mdnblocks(v->mdfd_vfd, BLCKSZ);
if (nblocks > RELSEG_SIZE)
elog(FATAL, "segment too big in mdnblocks!");
v->mdfd_lstbcnt = nblocks;
if (nblocks == RELSEG_SIZE)
{
v->mdfd_lstbcnt = RELSEG_SIZE;
segno++;
if (v->mdfd_chain == (MdfdVec *) NULL)
@ -711,22 +712,55 @@ mdtruncate(Relation reln, int nblocks)
MdfdVec *v;
#ifndef LET_OS_MANAGE_FILESIZE
int curnblk;
int curnblk,
i,
oldsegno,
newsegno,
lastsegblocks;
MdfdVec **varray;
curnblk = mdnblocks(reln);
if (curnblk / RELSEG_SIZE > 0)
{
elog(NOTICE, "Can't truncate multi-segments relation %s",
reln->rd_rel->relname.data);
return curnblk;
}
if (nblocks > curnblk)
return -1;
oldsegno = curnblk / RELSEG_SIZE;
newsegno = nblocks / RELSEG_SIZE;
#endif
fd = RelationGetFile(reln);
v = &Md_fdvec[fd];
#ifndef LET_OS_MANAGE_FILESIZE
varray = (MdfdVec **)palloc((oldsegno + 1) * sizeof(MdfdVec *));
for (i = 0; i <= oldsegno; i++)
{
if (!v)
elog(ERROR,"segment isn't open in mdtruncate!");
varray[i] = v;
v = v->mdfd_chain;
}
for (i = oldsegno; i > newsegno; i--)
{
v = varray[i];
if (FileTruncate(v->mdfd_vfd, 0) < 0)
{
pfree(varray);
return -1;
}
v->mdfd_lstbcnt = 0;
}
/* Calculate the # of blocks in the last segment */
lastsegblocks = nblocks - (newsegno * RELSEG_SIZE);
v = varray[i];
pfree(varray);
if (FileTruncate(v->mdfd_vfd, lastsegblocks * BLCKSZ) < 0)
return -1;
v->mdfd_lstbcnt = lastsegblocks;
#else
if (FileTruncate(v->mdfd_vfd, nblocks * BLCKSZ) < 0)
return -1;
v->mdfd_lstbcnt = nblocks;
#endif
return nblocks;