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Repair possible failure to update hint bits back to disk, per

Browse Source 
http://archives.postgresql.org/pgsql-hackers/2004-10/msg00464.php.
This fix is intended to be permanent: it moves the responsibility for
calling SetBufferCommitInfoNeedsSave() into the tqual.c routines,
eliminating the requirement for callers to test whether t_infomask changed.
Also, tighten validity checking on buffer IDs in bufmgr.c --- several
routines were paranoid about out-of-range shared buffer numbers but not
about out-of-range local ones, which seems a tad pointless.
This commit is contained in:
Tom Lane
2004-10-15 22:40:29 +00:00
parent db9e2fd0a9
commit 9ffc8ed58b
13 changed files with 241 additions and 176 deletions
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14
src/backend/access/index/indexam.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/index/indexam.c,v 1.75 2004/09/30 23:21:14 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/index/indexam.c,v 1.76 2004/10/15 22:39:46 tgl Exp $
*
* INTERFACE ROUTINES
* index_open - open an index relation by relation OID
@@ -497,7 +497,6 @@ index_getnext(IndexScanDesc scan, ScanDirection direction)
for (;;)
{
bool found;
uint16 sv_infomask;
pgstat_count_index_scan(&scan->xs_pgstat_info);
@@ -541,19 +540,14 @@ index_getnext(IndexScanDesc scan, ScanDirection direction)
* index AM to not return it on future indexscans.
*
* We told heap_release_fetch to keep a pin on the buffer, so we can
* re-access the tuple here. But we must re-lock the buffer
* first. Also, it's just barely possible for an update of hint
* bits to occur here.
* re-access the tuple here. But we must re-lock the buffer first.
*/
LockBuffer(scan->xs_cbuf, BUFFER_LOCK_SHARE);
sv_infomask = heapTuple->t_data->t_infomask;
if (HeapTupleSatisfiesVacuum(heapTuple->t_data, RecentGlobalXmin) ==
HEAPTUPLE_DEAD)
if (HeapTupleSatisfiesVacuum(heapTuple->t_data, RecentGlobalXmin,
scan->xs_cbuf) == HEAPTUPLE_DEAD)
scan->kill_prior_tuple = true;
if (sv_infomask != heapTuple->t_data->t_infomask)
SetBufferCommitInfoNeedsSave(scan->xs_cbuf);
LockBuffer(scan->xs_cbuf, BUFFER_LOCK_UNLOCK);
}