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Fix contrib/pg_freespacemap's underestimate of the number of pages it

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could find in the FSM.  Per report from Dimitri Fontaine and Andrew Gierth.

(Affects only 8.2 and 8.3 since HEAD no longer has MaxFSMPages at all.)
This commit is contained in:
Tom Lane 2009-04-07 18:11:04 +00:00
parent 6a42ab4eb8
commit 0e7d4c0289
1 changed files with 6 additions and 2 deletions
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8
contrib/pg_freespacemap/pg_freespacemap.c
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@ -3,7 +3,7 @@
* pg_freespacemap.c
* display some contents of the free space relation and page maps.
*
* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.c,v 1.9 2006/10/19 18:32:46 tgl Exp $
* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.c,v 1.9.2.1 2009/04/07 18:11:04 tgl Exp $
*-------------------------------------------------------------------------
*/
#include "postgres.h"
@ -94,6 +94,7 @@ pg_freespacemap_pages(PG_FUNCTION_ARGS)
if (SRF_IS_FIRSTCALL())
{
int i;
int nchunks; /* Size of freespace.c's arena. */
int numPages; /* Max possible no. of pages in map. */
int nPages; /* Mapped pages for a relation. */
@ -102,7 +103,10 @@ pg_freespacemap_pages(PG_FUNCTION_ARGS)
*/
FreeSpaceMap = GetFreeSpaceMap();
numPages = MaxFSMPages;
/* this must match calculation in InitFreeSpaceMap(): */
nchunks = (MaxFSMPages - 1) / CHUNKPAGES + 1;
/* Worst case (lots of indexes) could have this many pages: */
numPages = nchunks * INDEXCHUNKPAGES;
funcctx = SRF_FIRSTCALL_INIT();