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pg_visibility: Add pg_truncate_visibility_map function.

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This requires some core changes as well so that we can properly
WAL-log the truncation.  Specifically, it changes the format of the
XLOG_SMGR_TRUNCATE WAL record, so bump XLOG_PAGE_MAGIC.

Patch by me, reviewed but not fully endorsed by Andres Freund.
This commit is contained in:
Robert Haas
2016-06-17 17:37:30 -04:00
parent 54f5c5150f
commit 71d05a2c7b
8 changed files with 133 additions and 13 deletions
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16
src/backend/catalog/storage.c
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@@ -268,6 +268,7 @@ RelationTruncate(Relation rel, BlockNumber nblocks)
xlrec.blkno = nblocks;
xlrec.rnode = rel->rd_node;
xlrec.flags = SMGR_TRUNCATE_ALL;
XLogBeginInsert();
XLogRegisterData((char *) &xlrec, sizeof(xlrec));
@@ -522,17 +523,22 @@ smgr_redo(XLogReaderState *record)
*/
XLogFlush(lsn);
smgrtruncate(reln, MAIN_FORKNUM, xlrec->blkno);
if ((xlrec->flags & SMGR_TRUNCATE_HEAP) != 0)
{
smgrtruncate(reln, MAIN_FORKNUM, xlrec->blkno);
/* Also tell xlogutils.c about it */
XLogTruncateRelation(xlrec->rnode, MAIN_FORKNUM, xlrec->blkno);
/* Also tell xlogutils.c about it */
XLogTruncateRelation(xlrec->rnode, MAIN_FORKNUM, xlrec->blkno);
}
/* Truncate FSM and VM too */
rel = CreateFakeRelcacheEntry(xlrec->rnode);
if (smgrexists(reln, FSM_FORKNUM))
if ((xlrec->flags & SMGR_TRUNCATE_FSM) != 0 &&
smgrexists(reln, FSM_FORKNUM))
FreeSpaceMapTruncateRel(rel, xlrec->blkno);
if (smgrexists(reln, VISIBILITYMAP_FORKNUM))
if ((xlrec->flags & SMGR_TRUNCATE_VM) != 0 &&
smgrexists(reln, VISIBILITYMAP_FORKNUM))
visibilitymap_truncate(rel, xlrec->blkno);
FreeFakeRelcacheEntry(rel);