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Commitf10f0ae

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Replace RelationOpenSmgr() with RelationGetSmgr().
The idea behind this patch is to design out bugs like the one fixedby commit9d52311. Previously, once one did RelationOpenSmgr(rel),it was considered okay to access rel->rd_smgr directly for somenot-very-clear interval. But since that pointer will be cleared byrelcache flushes, we had bugs arising from overreliance on a previousRelationOpenSmgr call still being effective.Now, very little code except that in rel.h and relcache.c should evertouch the rd_smgr field directly. The normal coding rule is to useRelationGetSmgr(rel) and not expect the result to be valid for longerthan one smgr function call. There are a couple of places where usingthe function every single time seemed like overkill, but they are nowannotated with large warning comments.Amul Sul, after an idea of mine.Discussion:https://postgr.es/m/CANiYTQsU7yMFpQYnv=BrcRVqK_3U3mtAzAsJCaqtzsDHfsUbdQ@mail.gmail.com
1 parent5b60cf3 commitf10f0ae

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21 files changed

+165
-166
lines changed

21 files changed

+165
-166
lines changed

‎contrib/amcheck/verify_nbtree.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -301,8 +301,7 @@ bt_index_check_internal(Oid indrelid, bool parentcheck, bool heapallindexed,
301301
boolheapkeyspace,
302302
allequalimage;
303303

304-
RelationOpenSmgr(indrel);
305-
if (!smgrexists(indrel->rd_smgr,MAIN_FORKNUM))
304+
if (!smgrexists(RelationGetSmgr(indrel),MAIN_FORKNUM))
306305
ereport(ERROR,
307306
(errcode(ERRCODE_INDEX_CORRUPTED),
308307
errmsg("index \"%s\" lacks a main relation fork",

‎contrib/bloom/blinsert.c‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -177,17 +177,17 @@ blbuildempty(Relation index)
177177
* this even when wal_level=minimal.
178178
*/
179179
PageSetChecksumInplace(metapage,BLOOM_METAPAGE_BLKNO);
180-
smgrwrite(index->rd_smgr,INIT_FORKNUM,BLOOM_METAPAGE_BLKNO,
180+
smgrwrite(RelationGetSmgr(index),INIT_FORKNUM,BLOOM_METAPAGE_BLKNO,
181181
(char*)metapage, true);
182-
log_newpage(&index->rd_smgr->smgr_rnode.node,INIT_FORKNUM,
182+
log_newpage(&(RelationGetSmgr(index))->smgr_rnode.node,INIT_FORKNUM,
183183
BLOOM_METAPAGE_BLKNO,metapage, true);
184184

185185
/*
186186
* An immediate sync is required even if we xlog'd the page, because the
187187
* write did not go through shared_buffers and therefore a concurrent
188188
* checkpoint may have moved the redo pointer past our xlog record.
189189
*/
190-
smgrimmedsync(index->rd_smgr,INIT_FORKNUM);
190+
smgrimmedsync(RelationGetSmgr(index),INIT_FORKNUM);
191191
}
192192

193193
/*

‎contrib/pg_prewarm/autoprewarm.c‎

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -514,15 +514,13 @@ autoprewarm_database_main(Datum main_arg)
514514
old_blk->filenode!=blk->filenode||
515515
old_blk->forknum!=blk->forknum)
516516
{
517-
RelationOpenSmgr(rel);
518-
519517
/*
520518
* smgrexists is not safe for illegal forknum, hence check whether
521519
* the passed forknum is valid before using it in smgrexists.
522520
*/
523521
if (blk->forknum>InvalidForkNumber&&
524522
blk->forknum <=MAX_FORKNUM&&
525-
smgrexists(rel->rd_smgr,blk->forknum))
523+
smgrexists(RelationGetSmgr(rel),blk->forknum))
526524
nblocks=RelationGetNumberOfBlocksInFork(rel,blk->forknum);
527525
else
528526
nblocks=0;

‎contrib/pg_prewarm/pg_prewarm.c‎

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -109,8 +109,7 @@ pg_prewarm(PG_FUNCTION_ARGS)
109109
aclcheck_error(aclresult,get_relkind_objtype(rel->rd_rel->relkind),get_rel_name(relOid));
110110

111111
/* Check that the fork exists. */
112-
RelationOpenSmgr(rel);
113-
if (!smgrexists(rel->rd_smgr,forkNumber))
112+
if (!smgrexists(RelationGetSmgr(rel),forkNumber))
114113
ereport(ERROR,
115114
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
116115
errmsg("fork \"%s\" does not exist for this relation",
@@ -178,7 +177,7 @@ pg_prewarm(PG_FUNCTION_ARGS)
178177
for (block=first_block;block <=last_block;++block)
179178
{
180179
CHECK_FOR_INTERRUPTS();
181-
smgrread(rel->rd_smgr,forkNumber,block,blockbuffer.data);
180+
smgrread(RelationGetSmgr(rel),forkNumber,block,blockbuffer.data);
182181
++blocks_done;
183182
}
184183
}

‎contrib/pg_visibility/pg_visibility.c‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -391,14 +391,14 @@ pg_truncate_visibility_map(PG_FUNCTION_ARGS)
391391
/* Only some relkinds have a visibility map */
392392
check_relation_relkind(rel);
393393

394-
RelationOpenSmgr(rel);
395-
rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]=InvalidBlockNumber;
394+
/* Forcibly reset cached file size */
395+
RelationGetSmgr(rel)->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]=InvalidBlockNumber;
396396

397397
block=visibilitymap_prepare_truncate(rel,0);
398398
if (BlockNumberIsValid(block))
399399
{
400400
fork=VISIBILITYMAP_FORKNUM;
401-
smgrtruncate(rel->rd_smgr,&fork,1,&block);
401+
smgrtruncate(RelationGetSmgr(rel),&fork,1,&block);
402402
}
403403

404404
if (RelationNeedsWAL(rel))

‎src/backend/access/gist/gistbuild.c‎

Lines changed: 6 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -409,8 +409,7 @@ gist_indexsortbuild(GISTBuildState *state)
409409
* replaced with the real root page at the end.
410410
*/
411411
page=palloc0(BLCKSZ);
412-
RelationOpenSmgr(state->indexrel);
413-
smgrextend(state->indexrel->rd_smgr,MAIN_FORKNUM,GIST_ROOT_BLKNO,
412+
smgrextend(RelationGetSmgr(state->indexrel),MAIN_FORKNUM,GIST_ROOT_BLKNO,
414413
page, true);
415414
state->pages_allocated++;
416415
state->pages_written++;
@@ -450,10 +449,9 @@ gist_indexsortbuild(GISTBuildState *state)
450449
gist_indexsortbuild_flush_ready_pages(state);
451450

452451
/* Write out the root */
453-
RelationOpenSmgr(state->indexrel);
454452
PageSetLSN(pagestate->page,GistBuildLSN);
455453
PageSetChecksumInplace(pagestate->page,GIST_ROOT_BLKNO);
456-
smgrwrite(state->indexrel->rd_smgr,MAIN_FORKNUM,GIST_ROOT_BLKNO,
454+
smgrwrite(RelationGetSmgr(state->indexrel),MAIN_FORKNUM,GIST_ROOT_BLKNO,
457455
pagestate->page, true);
458456
if (RelationNeedsWAL(state->indexrel))
459457
log_newpage(&state->indexrel->rd_node,MAIN_FORKNUM,GIST_ROOT_BLKNO,
@@ -562,8 +560,6 @@ gist_indexsortbuild_flush_ready_pages(GISTBuildState *state)
562560
if (state->ready_num_pages==0)
563561
return;
564562

565-
RelationOpenSmgr(state->indexrel);
566-
567563
for (inti=0;i<state->ready_num_pages;i++)
568564
{
569565
Pagepage=state->ready_pages[i];
@@ -575,7 +571,8 @@ gist_indexsortbuild_flush_ready_pages(GISTBuildState *state)
575571

576572
PageSetLSN(page,GistBuildLSN);
577573
PageSetChecksumInplace(page,blkno);
578-
smgrextend(state->indexrel->rd_smgr,MAIN_FORKNUM,blkno,page, true);
574+
smgrextend(RelationGetSmgr(state->indexrel),MAIN_FORKNUM,blkno,page,
575+
true);
579576

580577
state->pages_written++;
581578
}
@@ -860,7 +857,8 @@ gistBuildCallback(Relation index,
860857
*/
861858
if ((buildstate->buildMode==GIST_BUFFERING_AUTO&&
862859
buildstate->indtuples %BUFFERING_MODE_SWITCH_CHECK_STEP==0&&
863-
effective_cache_size<smgrnblocks(index->rd_smgr,MAIN_FORKNUM))||
860+
effective_cache_size<smgrnblocks(RelationGetSmgr(index),
861+
MAIN_FORKNUM))||
864862
(buildstate->buildMode==GIST_BUFFERING_STATS&&
865863
buildstate->indtuples >=BUFFERING_MODE_TUPLE_SIZE_STATS_TARGET))
866864
{

‎src/backend/access/hash/hashpage.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1024,9 +1024,9 @@ _hash_alloc_buckets(Relation rel, BlockNumber firstblock, uint32 nblocks)
10241024
zerobuf.data,
10251025
true);
10261026

1027-
RelationOpenSmgr(rel);
10281027
PageSetChecksumInplace(page,lastblock);
1029-
smgrextend(rel->rd_smgr,MAIN_FORKNUM,lastblock,zerobuf.data, false);
1028+
smgrextend(RelationGetSmgr(rel),MAIN_FORKNUM,lastblock,zerobuf.data,
1029+
false);
10301030

10311031
return true;
10321032
}

‎src/backend/access/heap/heapam_handler.c‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -625,7 +625,6 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
625625
SMgrRelationdstrel;
626626

627627
dstrel=smgropen(*newrnode,rel->rd_backend);
628-
RelationOpenSmgr(rel);
629628

630629
/*
631630
* Since we copy the file directly without looking at the shared buffers,
@@ -645,14 +644,14 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
645644
RelationCreateStorage(*newrnode,rel->rd_rel->relpersistence);
646645

647646
/* copy main fork */
648-
RelationCopyStorage(rel->rd_smgr,dstrel,MAIN_FORKNUM,
647+
RelationCopyStorage(RelationGetSmgr(rel),dstrel,MAIN_FORKNUM,
649648
rel->rd_rel->relpersistence);
650649

651650
/* copy those extra forks that exist */
652651
for (ForkNumberforkNum=MAIN_FORKNUM+1;
653652
forkNum <=MAX_FORKNUM;forkNum++)
654653
{
655-
if (smgrexists(rel->rd_smgr,forkNum))
654+
if (smgrexists(RelationGetSmgr(rel),forkNum))
656655
{
657656
smgrcreate(dstrel,forkNum, false);
658657

@@ -664,7 +663,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
664663
(rel->rd_rel->relpersistence==RELPERSISTENCE_UNLOGGED&&
665664
forkNum==INIT_FORKNUM))
666665
log_smgrcreate(newrnode,forkNum);
667-
RelationCopyStorage(rel->rd_smgr,dstrel,forkNum,
666+
RelationCopyStorage(RelationGetSmgr(rel),dstrel,forkNum,
668667
rel->rd_rel->relpersistence);
669668
}
670669
}

‎src/backend/access/heap/rewriteheap.c‎

Lines changed: 4 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -326,9 +326,8 @@ end_heap_rewrite(RewriteState state)
326326

327327
PageSetChecksumInplace(state->rs_buffer,state->rs_blockno);
328328

329-
RelationOpenSmgr(state->rs_new_rel);
330-
smgrextend(state->rs_new_rel->rd_smgr,MAIN_FORKNUM,state->rs_blockno,
331-
(char*)state->rs_buffer, true);
329+
smgrextend(RelationGetSmgr(state->rs_new_rel),MAIN_FORKNUM,
330+
state->rs_blockno, (char*)state->rs_buffer, true);
332331
}
333332

334333
/*
@@ -339,11 +338,7 @@ end_heap_rewrite(RewriteState state)
339338
* wrote before the checkpoint.
340339
*/
341340
if (RelationNeedsWAL(state->rs_new_rel))
342-
{
343-
/* for an empty table, this could be first smgr access */
344-
RelationOpenSmgr(state->rs_new_rel);
345-
smgrimmedsync(state->rs_new_rel->rd_smgr,MAIN_FORKNUM);
346-
}
341+
smgrimmedsync(RelationGetSmgr(state->rs_new_rel),MAIN_FORKNUM);
347342

348343
logical_end_heap_rewrite(state);
349344

@@ -695,11 +690,9 @@ raw_heap_insert(RewriteState state, HeapTuple tup)
695690
* need for smgr to schedule an fsync for this write; we'll do it
696691
* ourselves in end_heap_rewrite.
697692
*/
698-
RelationOpenSmgr(state->rs_new_rel);
699-
700693
PageSetChecksumInplace(page,state->rs_blockno);
701694

702-
smgrextend(state->rs_new_rel->rd_smgr,MAIN_FORKNUM,
695+
smgrextend(RelationGetSmgr(state->rs_new_rel),MAIN_FORKNUM,
703696
state->rs_blockno, (char*)page, true);
704697

705698
state->rs_blockno++;

‎src/backend/access/heap/visibilitymap.c‎

Lines changed: 27 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -455,13 +455,11 @@ visibilitymap_prepare_truncate(Relation rel, BlockNumber nheapblocks)
455455
elog(DEBUG1,"vm_truncate %s %d",RelationGetRelationName(rel),nheapblocks);
456456
#endif
457457

458-
RelationOpenSmgr(rel);
459-
460458
/*
461459
* If no visibility map has been created yet for this relation, there's
462460
* nothing to truncate.
463461
*/
464-
if (!smgrexists(rel->rd_smgr,VISIBILITYMAP_FORKNUM))
462+
if (!smgrexists(RelationGetSmgr(rel),VISIBILITYMAP_FORKNUM))
465463
returnInvalidBlockNumber;
466464

467465
/*
@@ -528,7 +526,7 @@ visibilitymap_prepare_truncate(Relation rel, BlockNumber nheapblocks)
528526
else
529527
newnblocks=truncBlock;
530528

531-
if (smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM) <=newnblocks)
529+
if (smgrnblocks(RelationGetSmgr(rel),VISIBILITYMAP_FORKNUM) <=newnblocks)
532530
{
533531
/* nothing to do, the file was already smaller than requested size */
534532
returnInvalidBlockNumber;
@@ -547,30 +545,29 @@ static Buffer
547545
vm_readbuf(Relationrel,BlockNumberblkno,boolextend)
548546
{
549547
Bufferbuf;
548+
SMgrRelationreln;
550549

551550
/*
552-
* We might not have opened the relation at the smgr level yet, or we
553-
* might have been forced to close it by a sinval message. The code below
554-
* won't necessarily notice relation extension immediately when extend =
555-
* false, so we rely on sinval messages to ensure that our ideas about the
556-
* size of the map aren't too far out of date.
551+
* Caution: re-using this smgr pointer could fail if the relcache entry
552+
* gets closed. It's safe as long as we only do smgr-level operations
553+
* between here and the last use of the pointer.
557554
*/
558-
RelationOpenSmgr(rel);
555+
reln=RelationGetSmgr(rel);
559556

560557
/*
561558
* If we haven't cached the size of the visibility map fork yet, check it
562559
* first.
563560
*/
564-
if (rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]==InvalidBlockNumber)
561+
if (reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]==InvalidBlockNumber)
565562
{
566-
if (smgrexists(rel->rd_smgr,VISIBILITYMAP_FORKNUM))
567-
smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM);
563+
if (smgrexists(reln,VISIBILITYMAP_FORKNUM))
564+
smgrnblocks(reln,VISIBILITYMAP_FORKNUM);
568565
else
569-
rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]=0;
566+
reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]=0;
570567
}
571568

572569
/* Handle requests beyond EOF */
573-
if (blkno >=rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM])
570+
if (blkno >=reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM])
574571
{
575572
if (extend)
576573
vm_extend(rel,blkno+1);
@@ -618,6 +615,7 @@ vm_extend(Relation rel, BlockNumber vm_nblocks)
618615
{
619616
BlockNumbervm_nblocks_now;
620617
PGAlignedBlockpg;
618+
SMgrRelationreln;
621619

622620
PageInit((Page)pg.data,BLCKSZ,0);
623621

@@ -633,29 +631,32 @@ vm_extend(Relation rel, BlockNumber vm_nblocks)
633631
*/
634632
LockRelationForExtension(rel,ExclusiveLock);
635633

636-
/* Might have to re-open if a cache flush happened */
637-
RelationOpenSmgr(rel);
634+
/*
635+
* Caution: re-using this smgr pointer could fail if the relcache entry
636+
* gets closed. It's safe as long as we only do smgr-level operations
637+
* between here and the last use of the pointer.
638+
*/
639+
reln=RelationGetSmgr(rel);
638640

639641
/*
640642
* Create the file first if it doesn't exist. If smgr_vm_nblocks is
641643
* positive then it must exist, no need for an smgrexists call.
642644
*/
643-
if ((rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]==0||
644-
rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]==InvalidBlockNumber)&&
645-
!smgrexists(rel->rd_smgr,VISIBILITYMAP_FORKNUM))
646-
smgrcreate(rel->rd_smgr,VISIBILITYMAP_FORKNUM, false);
645+
if ((reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]==0||
646+
reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]==InvalidBlockNumber)&&
647+
!smgrexists(reln,VISIBILITYMAP_FORKNUM))
648+
smgrcreate(reln,VISIBILITYMAP_FORKNUM, false);
647649

648650
/* Invalidate cache so that smgrnblocks() asks the kernel. */
649-
rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]=InvalidBlockNumber;
650-
vm_nblocks_now=smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM);
651+
reln->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM]=InvalidBlockNumber;
652+
vm_nblocks_now=smgrnblocks(reln,VISIBILITYMAP_FORKNUM);
651653

652654
/* Now extend the file */
653655
while (vm_nblocks_now<vm_nblocks)
654656
{
655657
PageSetChecksumInplace((Page)pg.data,vm_nblocks_now);
656658

657-
smgrextend(rel->rd_smgr,VISIBILITYMAP_FORKNUM,vm_nblocks_now,
658-
pg.data, false);
659+
smgrextend(reln,VISIBILITYMAP_FORKNUM,vm_nblocks_now,pg.data, false);
659660
vm_nblocks_now++;
660661
}
661662

@@ -666,7 +667,7 @@ vm_extend(Relation rel, BlockNumber vm_nblocks)
666667
* to keep checking for creation or extension of the file, which happens
667668
* infrequently.
668669
*/
669-
CacheInvalidateSmgr(rel->rd_smgr->smgr_rnode);
670+
CacheInvalidateSmgr(reln->smgr_rnode);
670671

671672
UnlockRelationForExtension(rel,ExclusiveLock);
672673
}

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