bool heapkeyspace,
allequalimage;
- 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_cached_nblocks[VISIBILITYMAP_FORKNUM] = InvalidBlockNumber;
+ /* Forcibly reset cached file size */
+ RelationGetSmgr(rel)->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] = InvalidBlockNumber;
block = visibilitymap_prepare_truncate(rel, 0);
if (BlockNumberIsValid(block))
{
fork = VISIBILITYMAP_FORKNUM;
- smgrtruncate(rel->rd_smgr, &fork, 1, &block);
+ smgrtruncate(RelationGetSmgr(rel), &fork, 1, &block);
}
if (RelationNeedsWAL(rel))
* replaced with the real root page at the end.
*/
page = palloc0(BLCKSZ);
- RelationOpenSmgr(state->indexrel);
- smgrextend(state->indexrel->rd_smgr, MAIN_FORKNUM, GIST_ROOT_BLKNO,
+ smgrextend(RelationGetSmgr(state->indexrel), MAIN_FORKNUM, GIST_ROOT_BLKNO,
page, true);
state->pages_allocated++;
state->pages_written++;
gist_indexsortbuild_flush_ready_pages(state);
/* Write out the root */
- RelationOpenSmgr(state->indexrel);
PageSetLSN(pagestate->page, GistBuildLSN);
PageSetChecksumInplace(pagestate->page, GIST_ROOT_BLKNO);
- smgrwrite(state->indexrel->rd_smgr, MAIN_FORKNUM, GIST_ROOT_BLKNO,
+ smgrwrite(RelationGetSmgr(state->indexrel), MAIN_FORKNUM, GIST_ROOT_BLKNO,
pagestate->page, true);
if (RelationNeedsWAL(state->indexrel))
log_newpage(&state->indexrel->rd_node, MAIN_FORKNUM, GIST_ROOT_BLKNO,
if (state->ready_num_pages == 0)
return;
- RelationOpenSmgr(state->indexrel);
-
for (int i = 0; i < state->ready_num_pages; i++)
{
Page page = state->ready_pages[i];
PageSetLSN(page, GistBuildLSN);
PageSetChecksumInplace(page, blkno);
- smgrextend(state->indexrel->rd_smgr, MAIN_FORKNUM, blkno, page, true);
+ smgrextend(RelationGetSmgr(state->indexrel), MAIN_FORKNUM, blkno, page,
+ true);
state->pages_written++;
}
*/
if ((buildstate->buildMode == 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->buildMode == 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;
}
SMgrRelation dstrel;
dstrel = smgropen(*newrnode, rel->rd_backend);
- RelationOpenSmgr(rel);
/*
* Since we copy the file directly without looking at the shared buffers,
RelationCreateStorage(*newrnode, rel->rd_rel->relpersistence);
/* copy main fork */
- RelationCopyStorage(rel->rd_smgr, dstrel, MAIN_FORKNUM,
+ RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
rel->rd_rel->relpersistence);
/* copy those extra forks that exist */
for (ForkNumber 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);
- RelationCopyStorage(rel->rd_smgr, dstrel, forkNum,
+ RelationCopyStorage(RelationGetSmgr(rel), dstrel, forkNum,
rel->rd_rel->relpersistence);
}
}
PageSetChecksumInplace(state->rs_buffer, state->rs_blockno);
- RelationOpenSmgr(state->rs_new_rel);
- smgrextend(state->rs_new_rel->rd_smgr, MAIN_FORKNUM, state->rs_blockno,
- (char *) state->rs_buffer, true);
+ smgrextend(RelationGetSmgr(state->rs_new_rel), MAIN_FORKNUM,
+ state->rs_blockno, (char *) state->rs_buffer, true);
}
/*
* wrote before the checkpoint.
*/
if (RelationNeedsWAL(state->rs_new_rel))
- {
- /* for an empty table, this could be first smgr access */
- RelationOpenSmgr(state->rs_new_rel);
- smgrimmedsync(state->rs_new_rel->rd_smgr, MAIN_FORKNUM);
- }
+ smgrimmedsync(RelationGetSmgr(state->rs_new_rel), MAIN_FORKNUM);
logical_end_heap_rewrite(state);
* need for smgr to schedule an 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 InvalidBlockNumber;
/*
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 InvalidBlockNumber;
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_cached_nblocks[VISIBILITYMAP_FORKNUM] == InvalidBlockNumber)
+ if (reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] == InvalidBlockNumber)
{
- if (smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM))
- smgrnblocks(rel->rd_smgr, VISIBILITYMAP_FORKNUM);
+ if (smgrexists(reln, VISIBILITYMAP_FORKNUM))
+ smgrnblocks(reln, VISIBILITYMAP_FORKNUM);
else
- rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] = 0;
+ reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] = 0;
}
/* Handle requests beyond EOF */
- if (blkno >= rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM])
+ if (blkno >= reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM])
{
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_cached_nblocks[VISIBILITYMAP_FORKNUM] == 0 ||
- rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] == InvalidBlockNumber) &&
- !smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM))
- smgrcreate(rel->rd_smgr, VISIBILITYMAP_FORKNUM, false);
+ if ((reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] == 0 ||
+ reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] == InvalidBlockNumber) &&
+ !smgrexists(reln, VISIBILITYMAP_FORKNUM))
+ smgrcreate(reln, VISIBILITYMAP_FORKNUM, false);
/* Invalidate cache so that smgrnblocks() asks the kernel. */
- rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] = InvalidBlockNumber;
- vm_nblocks_now = smgrnblocks(rel->rd_smgr, VISIBILITYMAP_FORKNUM);
+ reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] = InvalidBlockNumber;
+ 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,
- pg.data, false);
+ 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);
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);
}
* still not be on disk when the crash occurs.
*/
if (wstate->btws_use_wal)
- {
- 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);
}
/*
{
uint64 nblocks = 0;
- /* Open it at the smgr level if not already done */
- RelationOpenSmgr(rel);
-
/* InvalidForkNumber indicates returning the size for all forks */
if (forkNumber == InvalidForkNumber)
{
for (int i = 0; i < MAX_FORKNUM; i++)
- nblocks += smgrnblocks(rel->rd_smgr, i);
+ nblocks += smgrnblocks(RelationGetSmgr(rel), i);
}
else
- nblocks = smgrnblocks(rel->rd_smgr, forkNumber);
+ nblocks = smgrnblocks(RelationGetSmgr(rel), forkNumber);
return nblocks * BLCKSZ;
}
*/
if (create_storage)
{
- RelationOpenSmgr(rel);
-
switch (rel->rd_rel->relkind)
{
case RELKIND_VIEW:
* 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_indam->ambuildempty(indexRelation);
}
ForkNumber forks[MAX_FORKNUM];
BlockNumber blocks[MAX_FORKNUM];
int nforks = 0;
-
- /* 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 this loop.)
*/
- rel->rd_smgr->smgr_targblock = InvalidBlockNumber;
+ reln = RelationGetSmgr(rel);
+ reln->smgr_targblock = InvalidBlockNumber;
for (int i = 0; i <= MAX_FORKNUM; ++i)
- rel->rd_smgr->smgr_cached_nblocks[i] = InvalidBlockNumber;
+ reln->smgr_cached_nblocks[i] = InvalidBlockNumber;
/* Prepare for truncation of MAIN fork of the relation */
forks[nforks] = MAIN_FORKNUM;
nforks++;
/* Prepare for truncation of the FSM if it exists */
- fsm = smgrexists(rel->rd_smgr, FSM_FORKNUM);
+ fsm = smgrexists(RelationGetSmgr(rel), FSM_FORKNUM);
if (fsm)
{
blocks[nforks] = FreeSpaceMapPrepareTruncateRel(rel, nblocks);
}
/* Prepare for truncation of the visibility map too if it exists */
- vm = smgrexists(rel->rd_smgr, VISIBILITYMAP_FORKNUM);
+ vm = smgrexists(RelationGetSmgr(rel), VISIBILITYMAP_FORKNUM);
if (vm)
{
blocks[nforks] = visibilitymap_prepare_truncate(rel, nblocks);
}
/* Do the real work to truncate relation forks */
- smgrtruncate(rel->rd_smgr, forks, nforks, blocks);
+ smgrtruncate(RelationGetSmgr(rel), forks, nforks, blocks);
/*
* Update upper-level FSM pages to account for the truncation. This is
if (!pendingSyncHash)
return;
- RelationOpenSmgr(rel);
- pending = hash_search(pendingSyncHash, &(rel->rd_smgr->smgr_rnode.node),
+ pending = hash_search(pendingSyncHash,
+ &(RelationGetSmgr(rel)->smgr_rnode.node),
HASH_FIND, NULL);
if (pending)
pending->is_truncated = true;
* Note that this requires that there is no dirty data in shared buffers. If
* it's possible that there are, callers need to flush those using
* e.g. FlushRelationBuffers(rel).
+ *
+ * Also note that this is frequently called via locutions such as
+ * RelationCopyStorage(RelationGetSmgr(rel), ...);
+ * That's safe only because we perform only smgr and WAL operations here.
+ * If we invoked anything else, a relcache flush could cause our SMgrRelation
+ * argument to become a dangling pointer.
*/
void
RelationCopyStorage(SMgrRelation src, SMgrRelation dst,
if (!PageIsVerifiedExtended(page, blkno,
PIV_LOG_WARNING | PIV_REPORT_STAT))
+ {
+ /*
+ * For paranoia's sake, capture the file path before invoking the
+ * ereport machinery. This guards against the possibility of a
+ * relcache flush caused by, e.g., an errcontext callback.
+ * (errcontext callbacks shouldn't be risking any such thing, but
+ * people have been known to forget that rule.)
+ */
+ char *relpath = relpathbackend(src->smgr_rnode.node,
+ src->smgr_rnode.backend,
+ forkNum);
+
ereport(ERROR,
(errcode(ERRCODE_DATA_CORRUPTED),
errmsg("invalid page in block %u of relation %s",
- blkno,
- relpathbackend(src->smgr_rnode.node,
- src->smgr_rnode.backend,
- forkNum))));
+ blkno, relpath)));
+ }
/*
* WAL-log the copied page. Unfortunately we don't know what kind of a
SMgrRelation dstrel;
dstrel = smgropen(newrnode, rel->rd_backend);
- RelationOpenSmgr(rel);
/*
* Since we copy the file directly without looking at the shared buffers,
RelationCreateStorage(newrnode, rel->rd_rel->relpersistence);
/* copy main fork */
- RelationCopyStorage(rel->rd_smgr, dstrel, MAIN_FORKNUM,
+ RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
rel->rd_rel->relpersistence);
/* copy those extra forks that exist */
for (ForkNumber 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);
- RelationCopyStorage(rel->rd_smgr, dstrel, forkNum,
+ RelationCopyStorage(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 */
- return PrefetchLocalBuffer(reln->rd_smgr, forkNum, blockNum);
+ return PrefetchLocalBuffer(RelationGetSmgr(reln), forkNum, blockNum);
}
else
{
/* pass it to the shared buffer version */
- return PrefetchSharedBuffer(reln->rd_smgr, forkNum, blockNum);
+ return PrefetchSharedBuffer(RelationGetSmgr(reln), forkNum, blockNum);
}
}
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);
case RELKIND_SEQUENCE:
case RELKIND_INDEX:
case RELKIND_PARTITIONED_INDEX:
- /* Open it at the smgr level if not already done */
- RelationOpenSmgr(relation);
-
- return smgrnblocks(relation->rd_smgr, forkNum);
+ return smgrnblocks(RelationGetSmgr(relation), forkNum);
case RELKIND_RELATION:
case RELKIND_TOASTVALUE:
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 InvalidBlockNumber;
/* 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 InvalidBlockNumber; /* nothing to do; the FSM was already
* smaller */
}
{
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_cached_nblocks[FSM_FORKNUM] == InvalidBlockNumber ||
- blkno >= rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM])
+ if (reln->smgr_cached_nblocks[FSM_FORKNUM] == InvalidBlockNumber ||
+ blkno >= reln->smgr_cached_nblocks[FSM_FORKNUM])
{
/* Invalidate the cache so smgrnblocks asks the kernel. */
- rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM] = InvalidBlockNumber;
- if (smgrexists(rel->rd_smgr, FSM_FORKNUM))
- smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
+ reln->smgr_cached_nblocks[FSM_FORKNUM] = InvalidBlockNumber;
+ if (smgrexists(reln, FSM_FORKNUM))
+ smgrnblocks(reln, FSM_FORKNUM);
else
- rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM] = 0;
+ reln->smgr_cached_nblocks[FSM_FORKNUM] = 0;
}
/* Handle requests beyond EOF */
- if (blkno >= rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM])
+ if (blkno >= reln->smgr_cached_nblocks[FSM_FORKNUM])
{
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_cached_nblocks[FSM_FORKNUM] is positive then it must exist, no
* need for an smgrexists call.
*/
- if ((rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM] == 0 ||
- rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM] == InvalidBlockNumber) &&
- !smgrexists(rel->rd_smgr, FSM_FORKNUM))
- smgrcreate(rel->rd_smgr, FSM_FORKNUM, false);
+ if ((reln->smgr_cached_nblocks[FSM_FORKNUM] == 0 ||
+ reln->smgr_cached_nblocks[FSM_FORKNUM] == InvalidBlockNumber) &&
+ !smgrexists(reln, FSM_FORKNUM))
+ smgrcreate(reln, FSM_FORKNUM, false);
/* Invalidate cache so that smgrnblocks() asks the kernel. */
- rel->rd_smgr->smgr_cached_nblocks[FSM_FORKNUM] = InvalidBlockNumber;
- fsm_nblocks_now = smgrnblocks(rel->rd_smgr, FSM_FORKNUM);
+ reln->smgr_cached_nblocks[FSM_FORKNUM] = InvalidBlockNumber;
+ fsm_nblocks_now = smgrnblocks(reln, FSM_FORKNUM);
+ /* Extend as needed. */
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++;
}
#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 */
((relation)->rd_rel->relfilenode == InvalidOid))
/*
- * RelationOpenSmgr
- * Open the relation at the smgr level, if not already done.
- */
-#define RelationOpenSmgr(relation) \
- do { \
- if ((relation)->rd_smgr == NULL) \
- smgrsetowner(&((relation)->rd_smgr), smgropen((relation)->rd_node, (relation)->rd_backend)); \
- } while (0)
+ * 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;
+}
/*
* RelationCloseSmgr
* 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)
/*
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