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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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3
src/backend/access/rmgrdesc/smgrdesc.c
View File

@@ -37,7 +37,8 @@ smgr_desc(StringInfo buf, XLogReaderState *record)
xl_smgr_truncate *xlrec = (xl_smgr_truncate *) rec;
char *path = relpathperm(xlrec->rnode, MAIN_FORKNUM);
appendStringInfo(buf, "%s to %u blocks", path, xlrec->blkno);
appendStringInfo(buf, "%s to %u blocks flags %d", path,
xlrec->blkno, xlrec->flags);
pfree(path);
}
}

16
src/backend/catalog/storage.c
View File

@@ -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);

2
src/include/access/xlog_internal.h
View File

@@ -31,7 +31,7 @@
/*
* Each page of XLOG file has a header like this:
*/
#define XLOG_PAGE_MAGIC 0xD091 /* can be used as WAL version indicator */
#define XLOG_PAGE_MAGIC 0xD092 /* can be used as WAL version indicator */
typedef struct XLogPageHeaderData
{

8
src/include/catalog/storage_xlog.h
View File

@@ -36,10 +36,18 @@ typedef struct xl_smgr_create
ForkNumber forkNum;
} xl_smgr_create;
/* flags for xl_smgr_truncate */
#define SMGR_TRUNCATE_HEAP 0x0001
#define SMGR_TRUNCATE_VM 0x0002
#define SMGR_TRUNCATE_FSM 0x0004
#define SMGR_TRUNCATE_ALL \
(SMGR_TRUNCATE_HEAP|SMGR_TRUNCATE_VM|SMGR_TRUNCATE_FSM)
typedef struct xl_smgr_truncate
{
BlockNumber blkno;
RelFileNode rnode;
int flags;
} xl_smgr_truncate;
extern void log_smgrcreate(RelFileNode *rnode, ForkNumber forkNum);