MAPSIZE macro needs to use MAXALIGN(SizeOfPageHeaderData) instead of

SizeOfPageHeaderData, like PageGetContents does. Per report by Pavan
Deolasee.

diff --git a/src/backend/access/heap/visibilitymap.c b/src/backend/access/heap/visibilitymap.c
index 8d0befc74694f8a0fcb7e797fd1ee02893450de1..f8aa4bd4e841bcbc15c4a6c38a90c40f1fcb5a1d 100644 (file)
--- a/src/backend/access/heap/visibilitymap.c
+++ b/src/backend/access/heap/visibilitymap.c
@@ -101,7 +101,7 @@
  * extra headers, so the whole page minus except for the standard page header
  * is used for the bitmap.
  */
-#define MAPSIZE (BLCKSZ - SizeOfPageHeaderData)
+#define MAPSIZE (BLCKSZ - MAXALIGN(SizeOfPageHeaderData))
 
 /* Number of bits allocated for each heap block. */
 #define BITS_PER_HEAPBLOCK 1