PostgreSQL Source Code  git master
smgr.c
Go to the documentation of this file.
1 /*-------------------------------------------------------------------------
2  *
3  * smgr.c
4  * public interface routines to storage manager switch.
5  *
6  * All file system operations in POSTGRES dispatch through these
7  * routines.
8  *
9  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
10  * Portions Copyright (c) 1994, Regents of the University of California
11  *
12  *
13  * IDENTIFICATION
14  * src/backend/storage/smgr/smgr.c
15  *
16  *-------------------------------------------------------------------------
17  */
18 #include "postgres.h"
19 
20 #include "lib/ilist.h"
21 #include "storage/bufmgr.h"
22 #include "storage/ipc.h"
23 #include "storage/md.h"
24 #include "storage/smgr.h"
25 #include "utils/hsearch.h"
26 #include "utils/inval.h"
27 
28 
29 /*
30  * This struct of function pointers defines the API between smgr.c and
31  * any individual storage manager module. Note that smgr subfunctions are
32  * generally expected to report problems via elog(ERROR). An exception is
33  * that smgr_unlink should use elog(WARNING), rather than erroring out,
34  * because we normally unlink relations during post-commit/abort cleanup,
35  * and so it's too late to raise an error. Also, various conditions that
36  * would normally be errors should be allowed during bootstrap and/or WAL
37  * recovery --- see comments in md.c for details.
38  */
39 typedef struct f_smgr
40 {
41  void (*smgr_init) (void); /* may be NULL */
42  void (*smgr_shutdown) (void); /* may be NULL */
43  void (*smgr_open) (SMgrRelation reln);
44  void (*smgr_close) (SMgrRelation reln, ForkNumber forknum);
45  void (*smgr_create) (SMgrRelation reln, ForkNumber forknum,
46  bool isRedo);
48  void (*smgr_unlink) (RelFileNodeBackend rnode, ForkNumber forknum,
49  bool isRedo);
50  void (*smgr_extend) (SMgrRelation reln, ForkNumber forknum,
51  BlockNumber blocknum, char *buffer, bool skipFsync);
52  void (*smgr_prefetch) (SMgrRelation reln, ForkNumber forknum,
53  BlockNumber blocknum);
54  void (*smgr_read) (SMgrRelation reln, ForkNumber forknum,
55  BlockNumber blocknum, char *buffer);
56  void (*smgr_write) (SMgrRelation reln, ForkNumber forknum,
57  BlockNumber blocknum, char *buffer, bool skipFsync);
58  void (*smgr_writeback) (SMgrRelation reln, ForkNumber forknum,
59  BlockNumber blocknum, BlockNumber nblocks);
61  void (*smgr_truncate) (SMgrRelation reln, ForkNumber forknum,
62  BlockNumber nblocks);
63  void (*smgr_immedsync) (SMgrRelation reln, ForkNumber forknum);
64 } f_smgr;
65 
66 static const f_smgr smgrsw[] = {
67  /* magnetic disk */
68  {
69  .smgr_init = mdinit,
70  .smgr_shutdown = NULL,
71  .smgr_open = mdopen,
72  .smgr_close = mdclose,
73  .smgr_create = mdcreate,
74  .smgr_exists = mdexists,
75  .smgr_unlink = mdunlink,
76  .smgr_extend = mdextend,
77  .smgr_prefetch = mdprefetch,
78  .smgr_read = mdread,
79  .smgr_write = mdwrite,
80  .smgr_writeback = mdwriteback,
81  .smgr_nblocks = mdnblocks,
82  .smgr_truncate = mdtruncate,
83  .smgr_immedsync = mdimmedsync,
84  }
85 };
86 
87 static const int NSmgr = lengthof(smgrsw);
88 
89 /*
90  * Each backend has a hashtable that stores all extant SMgrRelation objects.
91  * In addition, "unowned" SMgrRelation objects are chained together in a list.
92  */
93 static HTAB *SMgrRelationHash = NULL;
94 
96 
97 /* local function prototypes */
98 static void smgrshutdown(int code, Datum arg);
99 
100 
101 /*
102  * smgrinit(), smgrshutdown() -- Initialize or shut down storage
103  * managers.
104  *
105  * Note: smgrinit is called during backend startup (normal or standalone
106  * case), *not* during postmaster start. Therefore, any resources created
107  * here or destroyed in smgrshutdown are backend-local.
108  */
109 void
110 smgrinit(void)
111 {
112  int i;
113 
114  for (i = 0; i < NSmgr; i++)
115  {
116  if (smgrsw[i].smgr_init)
117  smgrsw[i].smgr_init();
118  }
119 
120  /* register the shutdown proc */
122 }
123 
124 /*
125  * on_proc_exit hook for smgr cleanup during backend shutdown
126  */
127 static void
129 {
130  int i;
131 
132  for (i = 0; i < NSmgr; i++)
133  {
134  if (smgrsw[i].smgr_shutdown)
135  smgrsw[i].smgr_shutdown();
136  }
137 }
138 
139 /*
140  * smgropen() -- Return an SMgrRelation object, creating it if need be.
141  *
142  * This does not attempt to actually open the underlying file.
143  */
146 {
147  RelFileNodeBackend brnode;
148  SMgrRelation reln;
149  bool found;
150 
151  if (SMgrRelationHash == NULL)
152  {
153  /* First time through: initialize the hash table */
154  HASHCTL ctl;
155 
156  MemSet(&ctl, 0, sizeof(ctl));
157  ctl.keysize = sizeof(RelFileNodeBackend);
158  ctl.entrysize = sizeof(SMgrRelationData);
159  SMgrRelationHash = hash_create("smgr relation table", 400,
160  &ctl, HASH_ELEM | HASH_BLOBS);
161  dlist_init(&unowned_relns);
162  }
163 
164  /* Look up or create an entry */
165  brnode.node = rnode;
166  brnode.backend = backend;
167  reln = (SMgrRelation) hash_search(SMgrRelationHash,
168  (void *) &brnode,
169  HASH_ENTER, &found);
170 
171  /* Initialize it if not present before */
172  if (!found)
173  {
174  /* hash_search already filled in the lookup key */
175  reln->smgr_owner = NULL;
179  reln->smgr_which = 0; /* we only have md.c at present */
180 
181  /* implementation-specific initialization */
182  smgrsw[reln->smgr_which].smgr_open(reln);
183 
184  /* it has no owner yet */
185  dlist_push_tail(&unowned_relns, &reln->node);
186  }
187 
188  return reln;
189 }
190 
191 /*
192  * smgrsetowner() -- Establish a long-lived reference to an SMgrRelation object
193  *
194  * There can be only one owner at a time; this is sufficient since currently
195  * the only such owners exist in the relcache.
196  */
197 void
199 {
200  /* We don't support "disowning" an SMgrRelation here, use smgrclearowner */
201  Assert(owner != NULL);
202 
203  /*
204  * First, unhook any old owner. (Normally there shouldn't be any, but it
205  * seems possible that this can happen during swap_relation_files()
206  * depending on the order of processing. It's ok to close the old
207  * relcache entry early in that case.)
208  *
209  * If there isn't an old owner, then the reln should be in the unowned
210  * list, and we need to remove it.
211  */
212  if (reln->smgr_owner)
213  *(reln->smgr_owner) = NULL;
214  else
215  dlist_delete(&reln->node);
216 
217  /* Now establish the ownership relationship. */
218  reln->smgr_owner = owner;
219  *owner = reln;
220 }
221 
222 /*
223  * smgrclearowner() -- Remove long-lived reference to an SMgrRelation object
224  * if one exists
225  */
226 void
228 {
229  /* Do nothing if the SMgrRelation object is not owned by the owner */
230  if (reln->smgr_owner != owner)
231  return;
232 
233  /* unset the owner's reference */
234  *owner = NULL;
235 
236  /* unset our reference to the owner */
237  reln->smgr_owner = NULL;
238 
239  /* add to list of unowned relations */
240  dlist_push_tail(&unowned_relns, &reln->node);
241 }
242 
243 /*
244  * smgrexists() -- Does the underlying file for a fork exist?
245  */
246 bool
248 {
249  return smgrsw[reln->smgr_which].smgr_exists(reln, forknum);
250 }
251 
252 /*
253  * smgrclose() -- Close and delete an SMgrRelation object.
254  */
255 void
257 {
258  SMgrRelation *owner;
259  ForkNumber forknum;
260 
261  for (forknum = 0; forknum <= MAX_FORKNUM; forknum++)
262  smgrsw[reln->smgr_which].smgr_close(reln, forknum);
263 
264  owner = reln->smgr_owner;
265 
266  if (!owner)
267  dlist_delete(&reln->node);
268 
269  if (hash_search(SMgrRelationHash,
270  (void *) &(reln->smgr_rnode),
271  HASH_REMOVE, NULL) == NULL)
272  elog(ERROR, "SMgrRelation hashtable corrupted");
273 
274  /*
275  * Unhook the owner pointer, if any. We do this last since in the remote
276  * possibility of failure above, the SMgrRelation object will still exist.
277  */
278  if (owner)
279  *owner = NULL;
280 }
281 
282 /*
283  * smgrcloseall() -- Close all existing SMgrRelation objects.
284  */
285 void
287 {
289  SMgrRelation reln;
290 
291  /* Nothing to do if hashtable not set up */
292  if (SMgrRelationHash == NULL)
293  return;
294 
295  hash_seq_init(&status, SMgrRelationHash);
296 
297  while ((reln = (SMgrRelation) hash_seq_search(&status)) != NULL)
298  smgrclose(reln);
299 }
300 
301 /*
302  * smgrclosenode() -- Close SMgrRelation object for given RelFileNode,
303  * if one exists.
304  *
305  * This has the same effects as smgrclose(smgropen(rnode)), but it avoids
306  * uselessly creating a hashtable entry only to drop it again when no
307  * such entry exists already.
308  */
309 void
311 {
312  SMgrRelation reln;
313 
314  /* Nothing to do if hashtable not set up */
315  if (SMgrRelationHash == NULL)
316  return;
317 
318  reln = (SMgrRelation) hash_search(SMgrRelationHash,
319  (void *) &rnode,
320  HASH_FIND, NULL);
321  if (reln != NULL)
322  smgrclose(reln);
323 }
324 
325 /*
326  * smgrcreate() -- Create a new relation.
327  *
328  * Given an already-created (but presumably unused) SMgrRelation,
329  * cause the underlying disk file or other storage for the fork
330  * to be created.
331  */
332 void
333 smgrcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo)
334 {
335  smgrsw[reln->smgr_which].smgr_create(reln, forknum, isRedo);
336 }
337 
338 /*
339  * smgrdounlink() -- Immediately unlink all forks of a relation.
340  *
341  * All forks of the relation are removed from the store. This should
342  * not be used during transactional operations, since it can't be undone.
343  *
344  * If isRedo is true, it is okay for the underlying file(s) to be gone
345  * already.
346  */
347 void
348 smgrdounlink(SMgrRelation reln, bool isRedo)
349 {
350  RelFileNodeBackend rnode = reln->smgr_rnode;
351  int which = reln->smgr_which;
352  ForkNumber forknum;
353 
354  /* Close the forks at smgr level */
355  for (forknum = 0; forknum <= MAX_FORKNUM; forknum++)
356  smgrsw[which].smgr_close(reln, forknum);
357 
358  /*
359  * Get rid of any remaining buffers for the relation. bufmgr will just
360  * drop them without bothering to write the contents.
361  */
362  DropRelFileNodesAllBuffers(&rnode, 1);
363 
364  /*
365  * It'd be nice to tell the stats collector to forget it immediately, too.
366  * But we can't because we don't know the OID (and in cases involving
367  * relfilenode swaps, it's not always clear which table OID to forget,
368  * anyway).
369  */
370 
371  /*
372  * Send a shared-inval message to force other backends to close any
373  * dangling smgr references they may have for this rel. We should do this
374  * before starting the actual unlinking, in case we fail partway through
375  * that step. Note that the sinval message will eventually come back to
376  * this backend, too, and thereby provide a backstop that we closed our
377  * own smgr rel.
378  */
379  CacheInvalidateSmgr(rnode);
380 
381  /*
382  * Delete the physical file(s).
383  *
384  * Note: smgr_unlink must treat deletion failure as a WARNING, not an
385  * ERROR, because we've already decided to commit or abort the current
386  * xact.
387  */
388  smgrsw[which].smgr_unlink(rnode, InvalidForkNumber, isRedo);
389 }
390 
391 /*
392  * smgrdounlinkall() -- Immediately unlink all forks of all given relations
393  *
394  * All forks of all given relations are removed from the store. This
395  * should not be used during transactional operations, since it can't be
396  * undone.
397  *
398  * If isRedo is true, it is okay for the underlying file(s) to be gone
399  * already.
400  *
401  * This is equivalent to calling smgrdounlink for each relation, but it's
402  * significantly quicker so should be preferred when possible.
403  */
404 void
405 smgrdounlinkall(SMgrRelation *rels, int nrels, bool isRedo)
406 {
407  int i = 0;
408  RelFileNodeBackend *rnodes;
409  ForkNumber forknum;
410 
411  if (nrels == 0)
412  return;
413 
414  /*
415  * create an array which contains all relations to be dropped, and close
416  * each relation's forks at the smgr level while at it
417  */
418  rnodes = palloc(sizeof(RelFileNodeBackend) * nrels);
419  for (i = 0; i < nrels; i++)
420  {
421  RelFileNodeBackend rnode = rels[i]->smgr_rnode;
422  int which = rels[i]->smgr_which;
423 
424  rnodes[i] = rnode;
425 
426  /* Close the forks at smgr level */
427  for (forknum = 0; forknum <= MAX_FORKNUM; forknum++)
428  smgrsw[which].smgr_close(rels[i], forknum);
429  }
430 
431  /*
432  * Get rid of any remaining buffers for the relations. bufmgr will just
433  * drop them without bothering to write the contents.
434  */
435  DropRelFileNodesAllBuffers(rnodes, nrels);
436 
437  /*
438  * It'd be nice to tell the stats collector to forget them immediately,
439  * too. But we can't because we don't know the OIDs.
440  */
441 
442  /*
443  * Send a shared-inval message to force other backends to close any
444  * dangling smgr references they may have for these rels. We should do
445  * this before starting the actual unlinking, in case we fail partway
446  * through that step. Note that the sinval messages will eventually come
447  * back to this backend, too, and thereby provide a backstop that we
448  * closed our own smgr rel.
449  */
450  for (i = 0; i < nrels; i++)
451  CacheInvalidateSmgr(rnodes[i]);
452 
453  /*
454  * Delete the physical file(s).
455  *
456  * Note: smgr_unlink must treat deletion failure as a WARNING, not an
457  * ERROR, because we've already decided to commit or abort the current
458  * xact.
459  */
460 
461  for (i = 0; i < nrels; i++)
462  {
463  int which = rels[i]->smgr_which;
464 
465  for (forknum = 0; forknum <= MAX_FORKNUM; forknum++)
466  smgrsw[which].smgr_unlink(rnodes[i], forknum, isRedo);
467  }
468 
469  pfree(rnodes);
470 }
471 
472 
473 /*
474  * smgrextend() -- Add a new block to a file.
475  *
476  * The semantics are nearly the same as smgrwrite(): write at the
477  * specified position. However, this is to be used for the case of
478  * extending a relation (i.e., blocknum is at or beyond the current
479  * EOF). Note that we assume writing a block beyond current EOF
480  * causes intervening file space to become filled with zeroes.
481  */
482 void
484  char *buffer, bool skipFsync)
485 {
486  smgrsw[reln->smgr_which].smgr_extend(reln, forknum, blocknum,
487  buffer, skipFsync);
488 }
489 
490 /*
491  * smgrprefetch() -- Initiate asynchronous read of the specified block of a relation.
492  */
493 void
495 {
496  smgrsw[reln->smgr_which].smgr_prefetch(reln, forknum, blocknum);
497 }
498 
499 /*
500  * smgrread() -- read a particular block from a relation into the supplied
501  * buffer.
502  *
503  * This routine is called from the buffer manager in order to
504  * instantiate pages in the shared buffer cache. All storage managers
505  * return pages in the format that POSTGRES expects.
506  */
507 void
508 smgrread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
509  char *buffer)
510 {
511  smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer);
512 }
513 
514 /*
515  * smgrwrite() -- Write the supplied buffer out.
516  *
517  * This is to be used only for updating already-existing blocks of a
518  * relation (ie, those before the current EOF). To extend a relation,
519  * use smgrextend().
520  *
521  * This is not a synchronous write -- the block is not necessarily
522  * on disk at return, only dumped out to the kernel. However,
523  * provisions will be made to fsync the write before the next checkpoint.
524  *
525  * skipFsync indicates that the caller will make other provisions to
526  * fsync the relation, so we needn't bother. Temporary relations also
527  * do not require fsync.
528  */
529 void
531  char *buffer, bool skipFsync)
532 {
533  smgrsw[reln->smgr_which].smgr_write(reln, forknum, blocknum,
534  buffer, skipFsync);
535 }
536 
537 
538 /*
539  * smgrwriteback() -- Trigger kernel writeback for the supplied range of
540  * blocks.
541  */
542 void
544  BlockNumber nblocks)
545 {
546  smgrsw[reln->smgr_which].smgr_writeback(reln, forknum, blocknum,
547  nblocks);
548 }
549 
550 /*
551  * smgrnblocks() -- Calculate the number of blocks in the
552  * supplied relation.
553  */
556 {
557  return smgrsw[reln->smgr_which].smgr_nblocks(reln, forknum);
558 }
559 
560 /*
561  * smgrtruncate() -- Truncate the given forks of supplied relation to
562  * each specified numbers of blocks
563  *
564  * The truncation is done immediately, so this can't be rolled back.
565  *
566  * The caller must hold AccessExclusiveLock on the relation, to ensure that
567  * other backends receive the smgr invalidation event that this function sends
568  * before they access any forks of the relation again.
569  */
570 void
571 smgrtruncate(SMgrRelation reln, ForkNumber *forknum, int nforks, BlockNumber *nblocks)
572 {
573  int i;
574 
575  /*
576  * Get rid of any buffers for the about-to-be-deleted blocks. bufmgr will
577  * just drop them without bothering to write the contents.
578  */
579  DropRelFileNodeBuffers(reln->smgr_rnode, forknum, nforks, nblocks);
580 
581  /*
582  * Send a shared-inval message to force other backends to close any smgr
583  * references they may have for this rel. This is useful because they
584  * might have open file pointers to segments that got removed, and/or
585  * smgr_targblock variables pointing past the new rel end. (The inval
586  * message will come back to our backend, too, causing a
587  * probably-unnecessary local smgr flush. But we don't expect that this
588  * is a performance-critical path.) As in the unlink code, we want to be
589  * sure the message is sent before we start changing things on-disk.
590  */
592 
593  /* Do the truncation */
594  for (i = 0; i < nforks; i++)
595  {
596  smgrsw[reln->smgr_which].smgr_truncate(reln, forknum[i], nblocks[i]);
597 
598  /*
599  * We might as well update the local smgr_fsm_nblocks and
600  * smgr_vm_nblocks settings. The smgr cache inval message that
601  * this function sent will cause other backends to invalidate
602  * their copies of smgr_fsm_nblocks and smgr_vm_nblocks,
603  * and these ones too at the next command boundary.
604  * But these ensure they aren't outright wrong until then.
605  */
606  if (forknum[i] == FSM_FORKNUM)
607  reln->smgr_fsm_nblocks = nblocks[i];
608  if (forknum[i] == VISIBILITYMAP_FORKNUM)
609  reln->smgr_vm_nblocks = nblocks[i];
610  }
611 }
612 
613 /*
614  * smgrimmedsync() -- Force the specified relation to stable storage.
615  *
616  * Synchronously force all previous writes to the specified relation
617  * down to disk.
618  *
619  * This is useful for building completely new relations (eg, new
620  * indexes). Instead of incrementally WAL-logging the index build
621  * steps, we can just write completed index pages to disk with smgrwrite
622  * or smgrextend, and then fsync the completed index file before
623  * committing the transaction. (This is sufficient for purposes of
624  * crash recovery, since it effectively duplicates forcing a checkpoint
625  * for the completed index. But it is *not* sufficient if one wishes
626  * to use the WAL log for PITR or replication purposes: in that case
627  * we have to make WAL entries as well.)
628  *
629  * The preceding writes should specify skipFsync = true to avoid
630  * duplicative fsyncs.
631  *
632  * Note that you need to do FlushRelationBuffers() first if there is
633  * any possibility that there are dirty buffers for the relation;
634  * otherwise the sync is not very meaningful.
635  */
636 void
638 {
639  smgrsw[reln->smgr_which].smgr_immedsync(reln, forknum);
640 }
641 
642 /*
643  * AtEOXact_SMgr
644  *
645  * This routine is called during transaction commit or abort (it doesn't
646  * particularly care which). All transient SMgrRelation objects are closed.
647  *
648  * We do this as a compromise between wanting transient SMgrRelations to
649  * live awhile (to amortize the costs of blind writes of multiple blocks)
650  * and needing them to not live forever (since we're probably holding open
651  * a kernel file descriptor for the underlying file, and we need to ensure
652  * that gets closed reasonably soon if the file gets deleted).
653  */
654 void
656 {
657  dlist_mutable_iter iter;
658 
659  /*
660  * Zap all unowned SMgrRelations. We rely on smgrclose() to remove each
661  * one from the list.
662  */
663  dlist_foreach_modify(iter, &unowned_relns)
664  {
666  iter.cur);
667 
668  Assert(rel->smgr_owner == NULL);
669 
670  smgrclose(rel);
671  }
672 }
void CacheInvalidateSmgr(RelFileNodeBackend rnode)
Definition: inval.c:1369
void(* smgr_truncate)(SMgrRelation reln, ForkNumber forknum, BlockNumber nblocks)
Definition: smgr.c:61
struct SMgrRelationData SMgrRelationData
void(* smgr_write)(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer, bool skipFsync)
Definition: smgr.c:56
BlockNumber smgr_vm_nblocks
Definition: smgr.h:56
void mdimmedsync(SMgrRelation reln, ForkNumber forknum)
Definition: md.c:891
void smgrclose(SMgrRelation reln)
Definition: smgr.c:256
dlist_node * cur
Definition: ilist.h:180
void smgrcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo)
Definition: smgr.c:333
void smgrclearowner(SMgrRelation *owner, SMgrRelation reln)
Definition: smgr.c:227
#define HASH_ELEM
Definition: hsearch.h:87
#define dlist_foreach_modify(iter, lhead)
Definition: ilist.h:524
SMgrRelationData * SMgrRelation
Definition: smgr.h:77
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:305
BlockNumber mdnblocks(SMgrRelation reln, ForkNumber forknum)
Definition: md.c:739
struct f_smgr f_smgr
static const f_smgr smgrsw[]
Definition: smgr.c:66
static void smgrshutdown(int code, Datum arg)
Definition: smgr.c:128
static void dlist_push_tail(dlist_head *head, dlist_node *node)
Definition: ilist.h:317
void(* smgr_close)(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:44
void smgrdounlink(SMgrRelation reln, bool isRedo)
Definition: smgr.c:348
Size entrysize
Definition: hsearch.h:73
void(* smgr_immedsync)(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:63
static HTAB * SMgrRelationHash
Definition: smgr.c:93
void smgrdounlinkall(SMgrRelation *rels, int nrels, bool isRedo)
Definition: smgr.c:405
void(* smgr_create)(SMgrRelation reln, ForkNumber forknum, bool isRedo)
Definition: smgr.c:45
#define MemSet(start, val, len)
Definition: c.h:955
uint32 BlockNumber
Definition: block.h:31
BlockNumber smgr_fsm_nblocks
Definition: smgr.h:55
bool smgrexists(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:247
#define lengthof(array)
Definition: c.h:662
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:906
void mdinit(void)
Definition: md.c:148
void mdextend(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer, bool skipFsync)
Definition: md.c:388
void(* smgr_open)(SMgrRelation reln)
Definition: smgr.c:43
void smgrcloseall(void)
Definition: smgr.c:286
void smgrread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer)
Definition: smgr.c:508
bool(* smgr_exists)(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:47
Definition: dynahash.c:208
void(* smgr_prefetch)(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
Definition: smgr.c:52
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
void AtEOXact_SMgr(void)
Definition: smgr.c:655
void pfree(void *pointer)
Definition: mcxt.c:1056
#define ERROR
Definition: elog.h:43
void(* smgr_init)(void)
Definition: smgr.c:41
static const int NSmgr
Definition: smgr.c:87
RelFileNodeBackend smgr_rnode
Definition: smgr.h:42
void mdunlink(RelFileNodeBackend rnode, ForkNumber forkNum, bool isRedo)
Definition: md.c:278
void smgrwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer, bool skipFsync)
Definition: smgr.c:530
void mdwriteback(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, BlockNumber nblocks)
Definition: md.c:560
void smgrwriteback(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, BlockNumber nblocks)
Definition: smgr.c:543
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
void(* smgr_unlink)(RelFileNodeBackend rnode, ForkNumber forknum, bool isRedo)
Definition: smgr.c:48
void smgrclosenode(RelFileNodeBackend rnode)
Definition: smgr.c:310
SMgrRelation smgropen(RelFileNode rnode, BackendId backend)
Definition: smgr.c:145
ForkNumber
Definition: relpath.h:40
void(* smgr_read)(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer)
Definition: smgr.c:54
Definition: smgr.c:39
struct SMgrRelationData ** smgr_owner
Definition: smgr.h:45
void mdopen(SMgrRelation reln)
Definition: md.c:495
#define HASH_BLOBS
Definition: hsearch.h:88
void smgrinit(void)
Definition: smgr.c:110
void DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
Definition: bufmgr.c:2996
HTAB * hash_create(const char *tabname, long nelem, HASHCTL *info, int flags)
Definition: dynahash.c:316
uintptr_t Datum
Definition: postgres.h:367
BlockNumber(* smgr_nblocks)(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:60
int smgr_which
Definition: smgr.h:64
int BackendId
Definition: backendid.h:21
struct RelFileNodeBackend RelFileNodeBackend
Size keysize
Definition: hsearch.h:72
void smgrtruncate(SMgrRelation reln, ForkNumber *forknum, int nforks, BlockNumber *nblocks)
Definition: smgr.c:571
static void dlist_init(dlist_head *head)
Definition: ilist.h:278
void mdtruncate(SMgrRelation reln, ForkNumber forknum, BlockNumber nblocks)
Definition: md.c:794
bool mdexists(SMgrRelation reln, ForkNumber forkNum)
Definition: md.c:161
RelFileNode node
Definition: relfilenode.h:74
BlockNumber smgrnblocks(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:555
void mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer, bool skipFsync)
Definition: md.c:674
#define Assert(condition)
Definition: c.h:732
void(* smgr_writeback)(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, BlockNumber nblocks)
Definition: smgr.c:58
void smgrsetowner(SMgrRelation *owner, SMgrRelation reln)
Definition: smgr.c:198
BlockNumber smgr_targblock
Definition: smgr.h:54
void mdprefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
Definition: md.c:537
BackendId backend
Definition: relfilenode.h:75
#define InvalidBlockNumber
Definition: block.h:33
#define MAX_FORKNUM
Definition: relpath.h:55
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1389
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1379
void mdclose(SMgrRelation reln, ForkNumber forknum)
Definition: md.c:506
void DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum, int nforks, BlockNumber *firstDelBlock)
Definition: bufmgr.c:2927
void smgrextend(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer, bool skipFsync)
Definition: smgr.c:483
void * palloc(Size size)
Definition: mcxt.c:949
void(* smgr_extend)(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer, bool skipFsync)
Definition: smgr.c:50
#define elog(elevel,...)
Definition: elog.h:226
int i
void mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
Definition: md.c:178
void smgrprefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
Definition: smgr.c:494
void * arg
void(* smgr_shutdown)(void)
Definition: smgr.c:42
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:227
void smgrimmedsync(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:637
unsigned char bool
Definition: c.h:308
dlist_node node
Definition: smgr.h:74
static dlist_head unowned_relns
Definition: smgr.c:95
void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, char *buffer)
Definition: md.c:609