From 0591bbd558ef23f756e6dcd2f4c5ee8250086040 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Fri, 18 Jun 1999 16:47:23 +0000
Subject: [PATCH] Patch to allow vacuum on multi-segment tables, from Hiroshi
Inoue
---
src/backend/storage/smgr/md.c | 58 +++++++++++++++++++++++++++--------
1 file changed, 46 insertions(+), 12 deletions(-)
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 5d84956059f..b5d7b86c21d 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -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;
--
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