if (btree_index_mainfork_expected(indrel))
{
- RelationOpenSmgr(indrel);
- if (!smgrexists(indrel->rd_smgr, MAIN_FORKNUM))
+ if (!smgrexists(RelationGetSmgr(indrel), MAIN_FORKNUM))
ereport(ERROR,
(errcode(ERRCODE_INDEX_CORRUPTED),
errmsg("index \"%s\" lacks a main relation fork",
* this even when wal_level=minimal.
*/
PageSetChecksumInplace(metapage, BLOOM_METAPAGE_BLKNO);
- smgrwrite(index->rd_smgr, INIT_FORKNUM, BLOOM_METAPAGE_BLKNO,
+ smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, BLOOM_METAPAGE_BLKNO,
(char *) metapage, true);
- log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
+ log_newpage(&(RelationGetSmgr(index))->smgr_rnode.node, INIT_FORKNUM,
BLOOM_METAPAGE_BLKNO, metapage, true);
/*
* write did not go through shared_buffers and therefore a concurrent
* checkpoint may have moved the redo pointer past our xlog record.
*/
- smgrimmedsync(index->rd_smgr, INIT_FORKNUM);
+ smgrimmedsync(RelationGetSmgr(index), INIT_FORKNUM);
}
/*
old_blk->filenode != blk->filenode ||
old_blk->forknum != blk->forknum)
{
- RelationOpenSmgr(rel);
-
/*
* smgrexists is not safe for illegal forknum, hence check whether
* the passed forknum is valid before using it in smgrexists.
*/
if (blk->forknum > InvalidForkNumber &&
blk->forknum <= MAX_FORKNUM &&
- smgrexists(rel->rd_smgr, blk->forknum))
+ smgrexists(RelationGetSmgr(rel), blk->forknum))
nblocks = RelationGetNumberOfBlocksInFork(rel, blk->forknum);
else
nblocks = 0;
aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind), get_rel_name(relOid));
/* Check that the fork exists. */
- RelationOpenSmgr(rel);
- if (!smgrexists(rel->rd_smgr, forkNumber))
+ if (!smgrexists(RelationGetSmgr(rel), forkNumber))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("fork \"%s\" does not exist for this relation",
for (block = first_block; block <= last_block; ++block)
{
CHECK_FOR_INTERRUPTS();
- smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data);
+ smgrread(RelationGetSmgr(rel), forkNumber, block, blockbuffer.data);
++blocks_done;
}
}
/* Only some relkinds have a visibility map */
check_relation_relkind(rel);
- RelationOpenSmgr(rel);
- rel->rd_smgr->smgr_vm_nblocks = InvalidBlockNumber;
+ /* Forcibly reset cached file size */
+ RelationGetSmgr(rel)->smgr_vm_nblocks = InvalidBlockNumber;
visibilitymap_truncate(rel, 0);
*/
if ((buildstate->bufferingMode == GIST_BUFFERING_AUTO &&
buildstate->indtuples % BUFFERING_MODE_SWITCH_CHECK_STEP == 0 &&
- effective_cache_size < smgrnblocks(index->rd_smgr, MAIN_FORKNUM)) ||
+ effective_cache_size < smgrnblocks(RelationGetSmgr(index), MAIN_FORKNUM)) ||
(buildstate->bufferingMode == GIST_BUFFERING_STATS &&
buildstate->indtuples >= BUFFERING_MODE_TUPLE_SIZE_STATS_TARGET))
{
zerobuf.data,
true);
- RelationOpenSmgr(rel);
PageSetChecksumInplace(page, lastblock);
- smgrextend(rel->rd_smgr, MAIN_FORKNUM, lastblock, zerobuf.data, false);
+ smgrextend(RelationGetSmgr(rel), MAIN_FORKNUM, lastblock, zerobuf.data,
+ false);
return true;
}
/* main heap */
FlushRelationBuffers(rel);
- /* FlushRelationBuffers will have opened rd_smgr */
- smgrimmedsync(rel->rd_smgr, MAIN_FORKNUM);
+ smgrimmedsync(RelationGetSmgr(rel), MAIN_FORKNUM);
/* FSM is not critical, don't bother syncing it */
toastrel = heap_open(rel->rd_rel->reltoastrelid, AccessShareLock);
FlushRelationBuffers(toastrel);
- smgrimmedsync(toastrel->rd_smgr, MAIN_FORKNUM);
+ smgrimmedsync(RelationGetSmgr(toastrel), MAIN_FORKNUM);
heap_close(toastrel, AccessShareLock);
}
}
state->rs_blockno,
state->rs_buffer,
true);
- RelationOpenSmgr(state->rs_new_rel);
PageSetChecksumInplace(state->rs_buffer, state->rs_blockno);
- smgrextend(state->rs_new_rel->rd_smgr, MAIN_FORKNUM, state->rs_blockno,
+ smgrextend(RelationGetSmgr(state->rs_new_rel), MAIN_FORKNUM, state->rs_blockno,
(char *) state->rs_buffer, true);
}
* fsync for this write; we'll do it ourselves in
* end_heap_rewrite.
*/
- RelationOpenSmgr(state->rs_new_rel);
-
PageSetChecksumInplace(page, state->rs_blockno);
- smgrextend(state->rs_new_rel->rd_smgr, MAIN_FORKNUM,
+ smgrextend(RelationGetSmgr(state->rs_new_rel), MAIN_FORKNUM,
state->rs_blockno, (char *) page, true);
state->rs_blockno++;
elog(DEBUG1, "vm_truncate %s %d", RelationGetRelationName(rel), nheapblocks);
#endif
- RelationOpenSmgr(rel);
-
/*
* If no visibility map has been created yet for this relation, there's
* nothing to truncate.
*/
- if (!smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM))
+ if (!smgrexists(RelationGetSmgr(rel), VISIBILITYMAP_FORKNUM))
return;
/*
else
newnblocks = truncBlock;
- if (smgrnblocks(rel->rd_smgr, VISIBILITYMAP_FORKNUM) <= newnblocks)
+ if (smgrnblocks(RelationGetSmgr(rel), VISIBILITYMAP_FORKNUM) <= newnblocks)
{
/* nothing to do, the file was already smaller than requested size */
return;
}
/* Truncate the unused VM pages, and send smgr inval message */
- smgrtruncate(rel->rd_smgr, VISIBILITYMAP_FORKNUM, newnblocks);
+ smgrtruncate(RelationGetSmgr(rel), VISIBILITYMAP_FORKNUM, newnblocks);
/*
* We might as well update the local smgr_vm_nblocks setting. smgrtruncate
vm_readbuf(Relation rel, BlockNumber blkno, bool extend)
{
Buffer buf;
+ SMgrRelation reln;
/*
- * We might not have opened the relation at the smgr level yet, or we
- * might have been forced to close it by a sinval message. The code below
- * won't necessarily notice relation extension immediately when extend =
- * false, so we rely on sinval messages to ensure that our ideas about the
- * size of the map aren't too far out of date.
+ * Caution: re-using this smgr pointer could fail if the relcache entry
+ * gets closed. It's safe as long as we only do smgr-level operations
+ * between here and the last use of the pointer.
*/
- RelationOpenSmgr(rel);
+ reln = RelationGetSmgr(rel);
/*
* If we haven't cached the size of the visibility map fork yet, check it
* first.
*/
- if (rel->rd_smgr->smgr_vm_nblocks == InvalidBlockNumber)
+ if (reln->smgr_vm_nblocks == InvalidBlockNumber)
{
- if (smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM))
- rel->rd_smgr->smgr_vm_nblocks = smgrnblocks(rel->rd_smgr,
- VISIBILITYMAP_FORKNUM);
+ if (smgrexists(reln, VISIBILITYMAP_FORKNUM))
+ reln->smgr_vm_nblocks = smgrnblocks(reln,
+ VISIBILITYMAP_FORKNUM);
else
- rel->rd_smgr->smgr_vm_nblocks = 0;
+ reln->smgr_vm_nblocks = 0;
}
/* Handle requests beyond EOF */
- if (blkno >= rel->rd_smgr->smgr_vm_nblocks)
+ if (blkno >= reln->smgr_vm_nblocks)
{
if (extend)
vm_extend(rel, blkno + 1);
{
BlockNumber vm_nblocks_now;
PGAlignedBlock pg;
+ SMgrRelation reln;
PageInit((Page) pg.data, BLCKSZ, 0);
*/
LockRelationForExtension(rel, ExclusiveLock);
- /* Might have to re-open if a cache flush happened */
- RelationOpenSmgr(rel);
+ /*
+ * Caution: re-using this smgr pointer could fail if the relcache entry
+ * gets closed. It's safe as long as we only do smgr-level operations
+ * between here and the last use of the pointer.
+ */
+ reln = RelationGetSmgr(rel);
/*
* Create the file first if it doesn't exist. If smgr_vm_nblocks is
* positive then it must exist, no need for an smgrexists call.
*/
- if ((rel->rd_smgr->smgr_vm_nblocks == 0 ||
- rel->rd_smgr->smgr_vm_nblocks == InvalidBlockNumber) &&
- !smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM))
- smgrcreate(rel->rd_smgr, VISIBILITYMAP_FORKNUM, false);
+ if ((reln->smgr_vm_nblocks == 0 ||
+ reln->smgr_vm_nblocks == InvalidBlockNumber) &&
+ !smgrexists(reln, VISIBILITYMAP_FORKNUM))
+ smgrcreate(reln, VISIBILITYMAP_FORKNUM, false);
- vm_nblocks_now = smgrnblocks(rel->rd_smgr, VISIBILITYMAP_FORKNUM);
+ vm_nblocks_now = smgrnblocks(reln, VISIBILITYMAP_FORKNUM);
/* Now extend the file */
while (vm_nblocks_now < vm_nblocks)
{
PageSetChecksumInplace((Page) pg.data, vm_nblocks_now);
- smgrextend(rel->rd_smgr, VISIBILITYMAP_FORKNUM, vm_nblocks_now,
+ smgrextend(reln, VISIBILITYMAP_FORKNUM, vm_nblocks_now,
pg.data, false);
vm_nblocks_now++;
}
* to keep checking for creation or extension of the file, which happens
* infrequently.
*/
- CacheInvalidateSmgr(rel->rd_smgr->smgr_rnode);
+ CacheInvalidateSmgr(reln->smgr_rnode);
/* Update local cache with the up-to-date size */
- rel->rd_smgr->smgr_vm_nblocks = vm_nblocks_now;
+ reln->smgr_vm_nblocks = vm_nblocks_now;
UnlockRelationForExtension(rel, ExclusiveLock);
}
* this even when wal_level=minimal.
*/
PageSetChecksumInplace(metapage, BTREE_METAPAGE);
- smgrwrite(index->rd_smgr, INIT_FORKNUM, BTREE_METAPAGE,
+ smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, BTREE_METAPAGE,
(char *) metapage, true);
- log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
+ log_newpage(&RelationGetSmgr(index)->smgr_rnode.node, INIT_FORKNUM,
BTREE_METAPAGE, metapage, true);
/*
* write did not go through shared_buffers and therefore a concurrent
* checkpoint may have moved the redo pointer past our xlog record.
*/
- smgrimmedsync(index->rd_smgr, INIT_FORKNUM);
+ smgrimmedsync(RelationGetSmgr(index), INIT_FORKNUM);
}
/*
static void
_bt_blwritepage(BTWriteState *wstate, Page page, BlockNumber blkno)
{
- /* Ensure rd_smgr is open (could have been closed by relcache flush!) */
- RelationOpenSmgr(wstate->index);
-
/* XLOG stuff */
if (wstate->btws_use_wal)
{
if (!wstate->btws_zeropage)
wstate->btws_zeropage = (Page) palloc0(BLCKSZ);
/* don't set checksum for all-zero page */
- smgrextend(wstate->index->rd_smgr, MAIN_FORKNUM,
+ smgrextend(RelationGetSmgr(wstate->index), MAIN_FORKNUM,
wstate->btws_pages_written++,
(char *) wstate->btws_zeropage,
true);
if (blkno == wstate->btws_pages_written)
{
/* extending the file... */
- smgrextend(wstate->index->rd_smgr, MAIN_FORKNUM, blkno,
+ smgrextend(RelationGetSmgr(wstate->index), MAIN_FORKNUM, blkno,
(char *) page, true);
wstate->btws_pages_written++;
}
else
{
/* overwriting a block we zero-filled before */
- smgrwrite(wstate->index->rd_smgr, MAIN_FORKNUM, blkno,
+ smgrwrite(RelationGetSmgr(wstate->index), MAIN_FORKNUM, blkno,
(char *) page, true);
}
* occurs.
*/
if (RelationNeedsWAL(wstate->index))
- {
- RelationOpenSmgr(wstate->index);
- smgrimmedsync(wstate->index->rd_smgr, MAIN_FORKNUM);
- }
+ smgrimmedsync(RelationGetSmgr(wstate->index), MAIN_FORKNUM);
}
/*
* replayed.
*/
PageSetChecksumInplace(page, SPGIST_METAPAGE_BLKNO);
- smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_METAPAGE_BLKNO,
+ smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, SPGIST_METAPAGE_BLKNO,
(char *) page, true);
- log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
+ log_newpage(&(RelationGetSmgr(index))->smgr_rnode.node, INIT_FORKNUM,
SPGIST_METAPAGE_BLKNO, page, true);
/* Likewise for the root page. */
SpGistInitPage(page, SPGIST_LEAF);
PageSetChecksumInplace(page, SPGIST_ROOT_BLKNO);
- smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_ROOT_BLKNO,
+ smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, SPGIST_ROOT_BLKNO,
(char *) page, true);
- log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
+ log_newpage(&(RelationGetSmgr(index))->smgr_rnode.node, INIT_FORKNUM,
SPGIST_ROOT_BLKNO, page, true);
/* Likewise for the null-tuples root page. */
SpGistInitPage(page, SPGIST_LEAF | SPGIST_NULLS);
PageSetChecksumInplace(page, SPGIST_NULL_BLKNO);
- smgrwrite(index->rd_smgr, INIT_FORKNUM, SPGIST_NULL_BLKNO,
+ smgrwrite(RelationGetSmgr(index), INIT_FORKNUM, SPGIST_NULL_BLKNO,
(char *) page, true);
- log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
+ log_newpage(&(RelationGetSmgr(index))->smgr_rnode.node, INIT_FORKNUM,
SPGIST_NULL_BLKNO, page, true);
/*
* writes did not go through shared buffers and therefore a concurrent
* checkpoint may have moved the redo pointer past our xlog record.
*/
- smgrimmedsync(index->rd_smgr, INIT_FORKNUM);
+ smgrimmedsync(RelationGetSmgr(index), INIT_FORKNUM);
}
/*
* demand.
*/
if (create_storage)
- {
- RelationOpenSmgr(rel);
RelationCreateStorage(rel->rd_node, relpersistence);
- }
/*
* If a tablespace is specified, removal of that tablespace is normally
Assert(rel->rd_rel->relkind == RELKIND_RELATION ||
rel->rd_rel->relkind == RELKIND_MATVIEW ||
rel->rd_rel->relkind == RELKIND_TOASTVALUE);
- RelationOpenSmgr(rel);
- smgrcreate(rel->rd_smgr, INIT_FORKNUM, false);
- log_smgrcreate(&rel->rd_smgr->smgr_rnode.node, INIT_FORKNUM);
- smgrimmedsync(rel->rd_smgr, INIT_FORKNUM);
+ smgrcreate(RelationGetSmgr(rel), INIT_FORKNUM, false);
+ log_smgrcreate(&(RelationGetSmgr(rel)->smgr_rnode.node), INIT_FORKNUM);
+ smgrimmedsync(RelationGetSmgr(rel), INIT_FORKNUM);
}
/*
* relfilenode won't change, and nothing needs to be done here.
*/
if (indexRelation->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
- !smgrexists(indexRelation->rd_smgr, INIT_FORKNUM))
+ !smgrexists(RelationGetSmgr(indexRelation), INIT_FORKNUM))
{
- RelationOpenSmgr(indexRelation);
- smgrcreate(indexRelation->rd_smgr, INIT_FORKNUM, false);
+ smgrcreate(RelationGetSmgr(indexRelation), INIT_FORKNUM, false);
indexRelation->rd_amroutine->ambuildempty(indexRelation);
}
{
bool fsm;
bool vm;
-
- /* Open it at the smgr level if not already done */
- RelationOpenSmgr(rel);
+ SMgrRelation reln;
/*
- * Make sure smgr_targblock etc aren't pointing somewhere past new end
+ * Make sure smgr_targblock etc aren't pointing somewhere past new end.
+ * (Note: don't rely on this reln pointer below here.)
*/
- rel->rd_smgr->smgr_targblock = InvalidBlockNumber;
- rel->rd_smgr->smgr_fsm_nblocks = InvalidBlockNumber;
- rel->rd_smgr->smgr_vm_nblocks = InvalidBlockNumber;
+ reln = RelationGetSmgr(rel);
+ reln->smgr_targblock = InvalidBlockNumber;
+ reln->smgr_fsm_nblocks = InvalidBlockNumber;
+ reln->smgr_vm_nblocks = InvalidBlockNumber;
/* Truncate the FSM first if it exists */
- fsm = smgrexists(rel->rd_smgr, FSM_FORKNUM);
+ fsm = smgrexists(reln, FSM_FORKNUM);
if (fsm)
FreeSpaceMapTruncateRel(rel, nblocks);
/* Truncate the visibility map too if it exists. */
- vm = smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM);
+ vm = smgrexists(RelationGetSmgr(rel), VISIBILITYMAP_FORKNUM);
if (vm)
visibilitymap_truncate(rel, nblocks);
* longer exist after truncation is complete, and then truncate the
* corresponding files on disk.
*/
- smgrtruncate(rel->rd_smgr, MAIN_FORKNUM, nblocks);
+ smgrtruncate(RelationGetSmgr(rel), MAIN_FORKNUM, nblocks);
/* We've done all the critical work, so checkpoints are OK now. */
MyProc->delayChkptEnd = false;
newrnode.spcNode = newTableSpace;
dstrel = smgropen(newrnode, rel->rd_backend);
- RelationOpenSmgr(rel);
-
/*
* Create and copy all forks of the relation, and schedule unlinking of
* old physical files.
RelationCreateStorage(newrnode, rel->rd_rel->relpersistence);
/* copy main fork */
- copy_relation_data(rel->rd_smgr, dstrel, MAIN_FORKNUM,
+ copy_relation_data(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
rel->rd_rel->relpersistence);
/* copy those extra forks that exist */
for (forkNum = MAIN_FORKNUM + 1; forkNum <= MAX_FORKNUM; forkNum++)
{
- if (smgrexists(rel->rd_smgr, forkNum))
+ if (smgrexists(RelationGetSmgr(rel), forkNum))
{
smgrcreate(dstrel, forkNum, false);
(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
forkNum == INIT_FORKNUM))
log_smgrcreate(&newrnode, forkNum);
- copy_relation_data(rel->rd_smgr, dstrel, forkNum,
+ copy_relation_data(RelationGetSmgr(rel), dstrel, forkNum,
rel->rd_rel->relpersistence);
}
}
Assert(RelationIsValid(reln));
Assert(BlockNumberIsValid(blockNum));
- /* Open it at the smgr level if not already done */
- RelationOpenSmgr(reln);
-
if (RelationUsesLocalBuffers(reln))
{
/* see comments in ReadBufferExtended */
errmsg("cannot access temporary tables of other sessions")));
/* pass it off to localbuf.c */
- LocalPrefetchBuffer(reln->rd_smgr, forkNum, blockNum);
+ LocalPrefetchBuffer(RelationGetSmgr(reln), forkNum, blockNum);
}
else
{
int buf_id;
/* create a tag so we can lookup the buffer */
- INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+ INIT_BUFFERTAG(newTag, RelationGetSmgr(reln)->smgr_rnode.node,
forkNum, blockNum);
/* determine its hash code and partition lock ID */
/* If not in buffers, initiate prefetch */
if (buf_id < 0)
- smgrprefetch(reln->rd_smgr, forkNum, blockNum);
+ smgrprefetch(RelationGetSmgr(reln), forkNum, blockNum);
/*
* If the block *is* in buffers, we do nothing. This is not really
bool hit;
Buffer buf;
- /* Open it at the smgr level if not already done */
- RelationOpenSmgr(reln);
-
/*
* Reject attempts to read non-local temporary relations; we would be
* likely to get wrong data since we have no visibility into the owning
* miss.
*/
pgstat_count_buffer_read(reln);
- buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence,
+ buf = ReadBuffer_common(RelationGetSmgr(reln), reln->rd_rel->relpersistence,
forkNum, blockNum, mode, strategy, &hit);
if (hit)
pgstat_count_buffer_hit(reln);
BlockNumber
RelationGetNumberOfBlocksInFork(Relation relation, ForkNumber forkNum)
{
- /* Open it at the smgr level if not already done */
- RelationOpenSmgr(relation);
-
- return smgrnblocks(relation->rd_smgr, forkNum);
+ return smgrnblocks(RelationGetSmgr(relation), forkNum);
}
/*
int i;
BufferDesc *bufHdr;
- /* Open rel at the smgr level if not already done */
- RelationOpenSmgr(rel);
-
if (RelationUsesLocalBuffers(rel))
{
for (i = 0; i < NLocBuffer; i++)
PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
- smgrwrite(rel->rd_smgr,
+ smgrwrite(RelationGetSmgr(rel),
bufHdr->tag.forkNum,
bufHdr->tag.blockNum,
localpage,
{
PinBuffer_Locked(bufHdr);
LWLockAcquire(BufferDescriptorGetContentLock(bufHdr), LW_SHARED);
- FlushBuffer(bufHdr, rel->rd_smgr);
+ FlushBuffer(bufHdr, RelationGetSmgr(rel));
LWLockRelease(BufferDescriptorGetContentLock(bufHdr));
UnpinBuffer(bufHdr, true);
}
uint16 first_removed_slot;
Buffer buf;
- RelationOpenSmgr(rel);
-
/*
* If no FSM has been created yet for this relation, there's nothing to
* truncate.
*/
- if (!smgrexists(rel->rd_smgr, FSM_FORKNUM))
+ if (!smgrexists(RelationGetSmgr(rel), FSM_FORKNUM))
return;
/* Get the location in the FSM of the first removed heap block */
else
{
new_nfsmblocks = fsm_logical_to_physical(first_removed_address);
- if (smgrnblocks(rel->rd_smgr, FSM_FORKNUM) <= new_nfsmblocks)
+ if (smgrnblocks(RelationGetSmgr(rel), FSM_FORKNUM) <= new_nfsmblocks)
return; /* nothing to do; the FSM was already smaller */
}
/* Truncate the unused FSM pages, and send smgr inval message */
- smgrtruncate(rel->rd_smgr, FSM_FORKNUM, new_nfsmblocks);
+ smgrtruncate(RelationGetSmgr(rel), FSM_FORKNUM, new_nfsmblocks);
/*
* We might as well update the local smgr_fsm_nblocks setting.
{
BlockNumber blkno = fsm_logical_to_physical(addr);
Buffer buf;
+ SMgrRelation reln;
- RelationOpenSmgr(rel);
+ /*
+ * Caution: re-using this smgr pointer could fail if the relcache entry
+ * gets closed. It's safe as long as we only do smgr-level operations
+ * between here and the last use of the pointer.
+ */
+ reln = RelationGetSmgr(rel);
/*
* If we haven't cached the size of the FSM yet, check it first. Also
* value might be stale. (We send smgr inval messages on truncation, but
* not on extension.)
*/
- if (rel->rd_smgr->smgr_fsm_nblocks == InvalidBlockNumber ||
- blkno >= rel->rd_smgr->smgr_fsm_nblocks)
+ if (reln->smgr_fsm_nblocks == InvalidBlockNumber ||
+ blkno >= reln->smgr_fsm_nblocks)
{
- if (smgrexists(rel->rd_smgr, FSM_FORKNUM))
- rel->rd_smgr->smgr_fsm_nblocks = smgrnblocks(rel->rd_smgr,
- FSM_FORKNUM);
+ if (smgrexists(reln, FSM_FORKNUM))
+ reln->smgr_fsm_nblocks = smgrnblocks(reln,
+ FSM_FORKNUM);
else
- rel->rd_smgr->smgr_fsm_nblocks = 0;
+ reln->smgr_fsm_nblocks = 0;
}
/* Handle requests beyond EOF */
- if (blkno >= rel->rd_smgr->smgr_fsm_nblocks)
+ if (blkno >= reln->smgr_fsm_nblocks)
{
if (extend)
fsm_extend(rel, blkno + 1);
{
BlockNumber fsm_nblocks_now;
PGAlignedBlock pg;
+ SMgrRelation reln;
PageInit((Page) pg.data, BLCKSZ, 0);
*/
LockRelationForExtension(rel, ExclusiveLock);
- /* Might have to re-open if a cache flush happened */
- RelationOpenSmgr(rel);
+ /*
+ * Caution: re-using this smgr pointer could fail if the relcache entry
+ * gets closed. It's safe as long as we only do smgr-level operations
+ * between here and the last use of the pointer.
+ */
+ reln = RelationGetSmgr(rel);
/*
* Create the FSM file first if it doesn't exist. If smgr_fsm_nblocks is
* positive then it must exist, no need for an smgrexists call.
*/
- if ((rel->rd_smgr->smgr_fsm_nblocks == 0 ||
- rel->rd_smgr->smgr_fsm_nblocks == InvalidBlockNumber) &&
- !smgrexists(rel->rd_smgr, FSM_FORKNUM))
- smgrcreate(rel->rd_smgr, FSM_FORKNUM, false);
+ if ((reln->smgr_fsm_nblocks == 0 ||
+ reln->smgr_fsm_nblocks == InvalidBlockNumber) &&
+ !smgrexists(reln, FSM_FORKNUM))
+ smgrcreate(reln, FSM_FORKNUM, false);
- fsm_nblocks_now = smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
+ fsm_nblocks_now = smgrnblocks(reln, FSM_FORKNUM);
while (fsm_nblocks_now < fsm_nblocks)
{
PageSetChecksumInplace((Page) pg.data, fsm_nblocks_now);
- smgrextend(rel->rd_smgr, FSM_FORKNUM, fsm_nblocks_now,
+ smgrextend(reln, FSM_FORKNUM, fsm_nblocks_now,
pg.data, false);
fsm_nblocks_now++;
}
/* Update local cache with the up-to-date size */
- rel->rd_smgr->smgr_fsm_nblocks = fsm_nblocks_now;
+ reln->smgr_fsm_nblocks = fsm_nblocks_now;
UnlockRelationForExtension(rel, ExclusiveLock);
}
#include "rewrite/prs2lock.h"
#include "storage/block.h"
#include "storage/relfilenode.h"
+#include "storage/smgr.h"
#include "utils/relcache.h"
#include "utils/reltrigger.h"
typedef struct RelationData
{
RelFileNode rd_node; /* relation physical identifier */
- /* use "struct" here to avoid needing to include smgr.h: */
- struct SMgrRelationData *rd_smgr; /* cached file handle, or NULL */
+ SMgrRelation rd_smgr; /* cached file handle, or NULL */
int rd_refcnt; /* reference count */
BackendId rd_backend; /* owning backend id, if temporary relation */
bool rd_islocaltemp; /* rel is a temp rel of this session */
#define RelationIsMapped(relation) \
((relation)->rd_rel->relfilenode == InvalidOid)
+/*
+ * RelationGetSmgr
+ * Returns smgr file handle for a relation, opening it if needed.
+ *
+ * Very little code is authorized to touch rel->rd_smgr directly. Instead
+ * use this function to fetch its value.
+ *
+ * Note: since a relcache flush can cause the file handle to be closed again,
+ * it's unwise to hold onto the pointer returned by this function for any
+ * long period. Recommended practice is to just re-execute RelationGetSmgr
+ * each time you need to access the SMgrRelation. It's quite cheap in
+ * comparison to whatever an smgr function is going to do.
+ */
+static inline SMgrRelation
+RelationGetSmgr(Relation rel)
+{
+ if (unlikely(rel->rd_smgr == NULL))
+ smgrsetowner(&(rel->rd_smgr), smgropen(rel->rd_node, rel->rd_backend));
+ return rel->rd_smgr;
+}
+
/*
* RelationOpenSmgr
* Open the relation at the smgr level, if not already done.
+ *
+ * XXX this is now deprecated, and should not be used in new code.
+ * Instead, call RelationGetSmgr in place of fetching rd_smgr directly.
*/
#define RelationOpenSmgr(relation) \
do { \
* Fetch relation's current insertion target block.
*
* Returns InvalidBlockNumber if there is no current target block. Note
- * that the target block status is discarded on any smgr-level invalidation.
+ * that the target block status is discarded on any smgr-level invalidation,
+ * so there's no need to re-open the smgr handle if it's not currently open.
*/
#define RelationGetTargetBlock(relation) \
( (relation)->rd_smgr != NULL ? (relation)->rd_smgr->smgr_targblock : InvalidBlockNumber )
*/
#define RelationSetTargetBlock(relation, targblock) \
do { \
- RelationOpenSmgr(relation); \
- (relation)->rd_smgr->smgr_targblock = (targblock); \
+ RelationGetSmgr(relation)->smgr_targblock = (targblock); \
} while (0)
/*
projects / thirdparty / postgresql.git / commitdiff
