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Prevent lazy_space_alloc from making requests that exceed MaxAllocSize,

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per report from Stefan Kaltenbrunner.
This commit is contained in:
Tom Lane
2006-03-04 19:09:23 +00:00
parent 8ccc7dfaf1
commit 53bbc47c2b
1 changed files with 4 additions and 1 deletions
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5
src/backend/commands/vacuumlazy.c
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@ -31,7 +31,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.61.2.1 2005/11/22 18:23:08 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.61.2.2 2006/03/04 19:09:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -48,6 +48,7 @@
#include "storage/freespace.h"
#include "storage/smgr.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/pg_rusage.h"
@ -955,6 +956,7 @@ lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
maxtuples = (maintenance_work_mem * 1024L) / sizeof(ItemPointerData);
maxtuples = Min(maxtuples, INT_MAX);
maxtuples = Min(maxtuples, MaxAllocSize / sizeof(ItemPointerData));
/* stay sane if small maintenance_work_mem */
maxtuples = Max(maxtuples, MaxHeapTuplesPerPage);
@ -964,6 +966,7 @@ lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
palloc(maxtuples * sizeof(ItemPointerData));
maxpages = MaxFSMPages;
maxpages = Min(maxpages, MaxAllocSize / sizeof(PageFreeSpaceInfo));
/* No need to allocate more pages than the relation has blocks */
if (relblocks < (BlockNumber) maxpages)
maxpages = (int) relblocks;