diff options
Diffstat (limited to 'src/backend/access/heap/visibilitymap.c')
| -rw-r--r-- | src/backend/access/heap/visibilitymap.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/backend/access/heap/visibilitymap.c b/src/backend/access/heap/visibilitymap.c index b472d31a03c..3ad4a9f5870 100644 --- a/src/backend/access/heap/visibilitymap.c +++ b/src/backend/access/heap/visibilitymap.c @@ -11,7 +11,7 @@ * src/backend/access/heap/visibilitymap.c * * INTERFACE ROUTINES - * visibilitymap_clear - clear a bit in the visibility map + * visibilitymap_clear - clear bits for one page in the visibility map * visibilitymap_pin - pin a map page for setting a bit * visibilitymap_pin_ok - check whether correct map page is already pinned * visibilitymap_set - set a bit in a previously pinned page @@ -159,20 +159,23 @@ static void vm_extend(Relation rel, BlockNumber nvmblocks); /* - * visibilitymap_clear - clear all bits for one page in visibility map + * visibilitymap_clear - clear specified bits for one page in visibility map * * You must pass a buffer containing the correct map page to this function. * Call visibilitymap_pin first to pin the right one. This function doesn't do - * any I/O. + * any I/O. Returns true if any bits have been cleared and false otherwise. */ -void -visibilitymap_clear(Relation rel, BlockNumber heapBlk, Buffer buf) +bool +visibilitymap_clear(Relation rel, BlockNumber heapBlk, Buffer buf, uint8 flags) { BlockNumber mapBlock = HEAPBLK_TO_MAPBLOCK(heapBlk); int mapByte = HEAPBLK_TO_MAPBYTE(heapBlk); int mapOffset = HEAPBLK_TO_OFFSET(heapBlk); - uint8 mask = VISIBILITYMAP_VALID_BITS << mapOffset; + uint8 mask = flags << mapOffset; char *map; + bool cleared = false; + + Assert(flags & VISIBILITYMAP_VALID_BITS); #ifdef TRACE_VISIBILITYMAP elog(DEBUG1, "vm_clear %s %d", RelationGetRelationName(rel), heapBlk); @@ -189,9 +192,12 @@ visibilitymap_clear(Relation rel, BlockNumber heapBlk, Buffer buf) map[mapByte] &= ~mask; MarkBufferDirty(buf); + cleared = true; } LockBuffer(buf, BUFFER_LOCK_UNLOCK); + + return cleared; } /* |