diff options
Diffstat (limited to 'src/backend')
| -rw-r--r-- | src/backend/access/heap/visibilitymap.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/backend/access/heap/visibilitymap.c b/src/backend/access/heap/visibilitymap.c index 8b24e7bc33c..79b79d5982e 100644 --- a/src/backend/access/heap/visibilitymap.c +++ b/src/backend/access/heap/visibilitymap.c @@ -239,8 +239,10 @@ visibilitymap_pin_ok(BlockNumber heapBlk, Buffer vmbuf) * 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. + * + * Returns the state of the page's VM bits before setting flags. */ -void +uint8 visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf, XLogRecPtr recptr, Buffer vmBuf, TransactionId cutoff_xid, uint8 flags) @@ -250,6 +252,7 @@ visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf, uint8 mapOffset = HEAPBLK_TO_OFFSET(heapBlk); Page page; uint8 *map; + uint8 status; #ifdef TRACE_VISIBILITYMAP elog(DEBUG1, "vm_set %s %d", RelationGetRelationName(rel), heapBlk); @@ -274,7 +277,8 @@ visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf, map = (uint8 *) PageGetContents(page); LockBuffer(vmBuf, BUFFER_LOCK_EXCLUSIVE); - if (flags != (map[mapByte] >> mapOffset & VISIBILITYMAP_VALID_BITS)) + status = (map[mapByte] >> mapOffset) & VISIBILITYMAP_VALID_BITS; + if (flags != status) { START_CRIT_SECTION(); @@ -311,6 +315,7 @@ visibilitymap_set(Relation rel, BlockNumber heapBlk, Buffer heapBuf, } LockBuffer(vmBuf, BUFFER_LOCK_UNLOCK); + return status; } /* |