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xlogutils.h File Reference
#include "access/xlogreader.h"
#include "storage/bufmgr.h"
Include dependency graph for xlogutils.h:
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Data Structures

struct  ReadLocalXLogPageNoWaitPrivate
 

Macros

#define InHotStandby   (standbyState >= STANDBY_SNAPSHOT_PENDING)
 

Typedefs

typedef struct ReadLocalXLogPageNoWaitPrivate ReadLocalXLogPageNoWaitPrivate
 

Enumerations

enum  HotStandbyState { STANDBY_DISABLED , STANDBY_INITIALIZED , STANDBY_SNAPSHOT_PENDING , STANDBY_SNAPSHOT_READY }
 
enum  XLogRedoAction { BLK_NEEDS_REDO , BLK_DONE , BLK_RESTORED , BLK_NOTFOUND }
 

Functions

bool XLogHaveInvalidPages (void)
 
void XLogCheckInvalidPages (void)
 
void XLogDropRelation (RelFileLocator rlocator, ForkNumber forknum)
 
void XLogDropDatabase (Oid dbid)
 
void XLogTruncateRelation (RelFileLocator rlocator, ForkNumber forkNum, BlockNumber nblocks)
 
XLogRedoAction XLogReadBufferForRedo (XLogReaderState *record, uint8 block_id, Buffer *buf)
 
Buffer XLogInitBufferForRedo (XLogReaderState *record, uint8 block_id)
 
XLogRedoAction XLogReadBufferForRedoExtended (XLogReaderState *record, uint8 block_id, ReadBufferMode mode, bool get_cleanup_lock, Buffer *buf)
 
Buffer XLogReadBufferExtended (RelFileLocator rlocator, ForkNumber forknum, BlockNumber blkno, ReadBufferMode mode, Buffer recent_buffer)
 
Relation CreateFakeRelcacheEntry (RelFileLocator rlocator)
 
void FreeFakeRelcacheEntry (Relation fakerel)
 
int read_local_xlog_page (XLogReaderState *state, XLogRecPtr targetPagePtr, int reqLen, XLogRecPtr targetRecPtr, char *cur_page)
 
int read_local_xlog_page_no_wait (XLogReaderState *state, XLogRecPtr targetPagePtr, int reqLen, XLogRecPtr targetRecPtr, char *cur_page)
 
void wal_segment_open (XLogReaderState *state, XLogSegNo nextSegNo, TimeLineID *tli_p)
 
void wal_segment_close (XLogReaderState *state)
 
void XLogReadDetermineTimeline (XLogReaderState *state, XLogRecPtr wantPage, uint32 wantLength, TimeLineID currTLI)
 
void WALReadRaiseError (WALReadError *errinfo)
 

Variables

PGDLLIMPORT bool ignore_invalid_pages
 
PGDLLIMPORT bool InRecovery
 
PGDLLIMPORT HotStandbyState standbyState
 

Macro Definition Documentation

◆ InHotStandby

#define InHotStandby   (standbyState >= STANDBY_SNAPSHOT_PENDING)

Definition at line 60 of file xlogutils.h.

Typedef Documentation

◆ ReadLocalXLogPageNoWaitPrivate

Enumeration Type Documentation

◆ HotStandbyState

Enumerator
STANDBY_DISABLED 
STANDBY_INITIALIZED 
STANDBY_SNAPSHOT_PENDING 
STANDBY_SNAPSHOT_READY 

Definition at line 50 of file xlogutils.h.

51{
HotStandbyState
Definition: xlogutils.h:51
@ STANDBY_DISABLED
Definition: xlogutils.h:52
@ STANDBY_SNAPSHOT_READY
Definition: xlogutils.h:55
@ STANDBY_SNAPSHOT_PENDING
Definition: xlogutils.h:54
@ STANDBY_INITIALIZED
Definition: xlogutils.h:53

◆ XLogRedoAction

Enumerator
BLK_NEEDS_REDO 
BLK_DONE 
BLK_RESTORED 
BLK_NOTFOUND 

Definition at line 72 of file xlogutils.h.

73{
74 BLK_NEEDS_REDO, /* changes from WAL record need to be applied */
75 BLK_DONE, /* block is already up-to-date */
76 BLK_RESTORED, /* block was restored from a full-page image */
77 BLK_NOTFOUND, /* block was not found (and hence does not
78 * need to be replayed) */
XLogRedoAction
Definition: xlogutils.h:73
@ BLK_RESTORED
Definition: xlogutils.h:76
@ BLK_NEEDS_REDO
Definition: xlogutils.h:74
@ BLK_DONE
Definition: xlogutils.h:75
@ BLK_NOTFOUND
Definition: xlogutils.h:77

Function Documentation

◆ CreateFakeRelcacheEntry()

Relation CreateFakeRelcacheEntry ( RelFileLocator  rlocator)

Definition at line 571 of file xlogutils.c.

572{
573 FakeRelCacheEntry fakeentry;
574 Relation rel;
575
576 /* Allocate the Relation struct and all related space in one block. */
577 fakeentry = palloc0(sizeof(FakeRelCacheEntryData));
578 rel = (Relation) fakeentry;
579
580 rel->rd_rel = &fakeentry->pgc;
581 rel->rd_locator = rlocator;
582
583 /*
584 * We will never be working with temp rels during recovery or while
585 * syncing WAL-skipped files.
586 */
588
589 /* It must be a permanent table here */
590 rel->rd_rel->relpersistence = RELPERSISTENCE_PERMANENT;
591
592 /* We don't know the name of the relation; use relfilenumber instead */
593 sprintf(RelationGetRelationName(rel), "%u", rlocator.relNumber);
594
595 /*
596 * We set up the lockRelId in case anything tries to lock the dummy
597 * relation. Note that this is fairly bogus since relNumber may be
598 * different from the relation's OID. It shouldn't really matter though.
599 * In recovery, we are running by ourselves and can't have any lock
600 * conflicts. While syncing, we already hold AccessExclusiveLock.
601 */
602 rel->rd_lockInfo.lockRelId.dbId = rlocator.dbOid;
603 rel->rd_lockInfo.lockRelId.relId = rlocator.relNumber;
604
605 /*
606 * Set up a non-pinned SMgrRelation reference, so that we don't need to
607 * worry about unpinning it on error.
608 */
609 rel->rd_smgr = smgropen(rlocator, INVALID_PROC_NUMBER);
610
611 return rel;
612}
void * palloc0(Size size)
Definition: mcxt.c:1969
#define sprintf
Definition: port.h:241
#define INVALID_PROC_NUMBER
Definition: procnumber.h:26
#define RelationGetRelationName(relation)
Definition: rel.h:550
struct RelationData * Relation
Definition: relcache.h:27
SMgrRelation smgropen(RelFileLocator rlocator, ProcNumber backend)
Definition: smgr.c:240
FormData_pg_class pgc
Definition: xlogutils.c:551
LockRelId lockRelId
Definition: rel.h:46
Oid relId
Definition: rel.h:40
Oid dbId
Definition: rel.h:41
RelFileNumber relNumber
ProcNumber rd_backend
Definition: rel.h:60
LockInfoData rd_lockInfo
Definition: rel.h:114
SMgrRelation rd_smgr
Definition: rel.h:58
RelFileLocator rd_locator
Definition: rel.h:57
Form_pg_class rd_rel
Definition: rel.h:111

References LockRelId::dbId, RelFileLocator::dbOid, INVALID_PROC_NUMBER, LockInfoData::lockRelId, palloc0(), FakeRelCacheEntryData::pgc, RelationData::rd_backend, RelationData::rd_locator, RelationData::rd_lockInfo, RelationData::rd_rel, RelationData::rd_smgr, RelationGetRelationName, LockRelId::relId, RelFileLocator::relNumber, smgropen(), and sprintf.

Referenced by heap_xlog_delete(), heap_xlog_insert(), heap_xlog_lock(), heap_xlog_lock_updated(), heap_xlog_multi_insert(), heap_xlog_update(), heap_xlog_visible(), smgr_redo(), and smgrDoPendingSyncs().

◆ FreeFakeRelcacheEntry()

void FreeFakeRelcacheEntry ( Relation  fakerel)

Definition at line 618 of file xlogutils.c.

619{
620 pfree(fakerel);
621}
void pfree(void *pointer)
Definition: mcxt.c:2146

References pfree().

Referenced by heap_xlog_delete(), heap_xlog_insert(), heap_xlog_lock(), heap_xlog_lock_updated(), heap_xlog_multi_insert(), heap_xlog_update(), heap_xlog_visible(), smgr_redo(), and smgrDoPendingSyncs().

◆ read_local_xlog_page()

int read_local_xlog_page ( XLogReaderState state,
XLogRecPtr  targetPagePtr,
int  reqLen,
XLogRecPtr  targetRecPtr,
char *  cur_page 
)

Definition at line 845 of file xlogutils.c.

847{
848 return read_local_xlog_page_guts(state, targetPagePtr, reqLen,
849 targetRecPtr, cur_page, true);
850}
Definition: regguts.h:323
static int read_local_xlog_page_guts(XLogReaderState *state, XLogRecPtr targetPagePtr, int reqLen, XLogRecPtr targetRecPtr, char *cur_page, bool wait_for_wal)
Definition: xlogutils.c:869

References read_local_xlog_page_guts().

Referenced by create_logical_replication_slot(), LogicalReplicationSlotHasPendingWal(), LogicalSlotAdvanceAndCheckSnapState(), pg_logical_slot_get_changes_guts(), and XlogReadTwoPhaseData().

◆ read_local_xlog_page_no_wait()

int read_local_xlog_page_no_wait ( XLogReaderState state,
XLogRecPtr  targetPagePtr,
int  reqLen,
XLogRecPtr  targetRecPtr,
char *  cur_page 
)

Definition at line 857 of file xlogutils.c.

860{
861 return read_local_xlog_page_guts(state, targetPagePtr, reqLen,
862 targetRecPtr, cur_page, false);
863}

References read_local_xlog_page_guts().

Referenced by InitXLogReaderState().

◆ wal_segment_close()

◆ wal_segment_open()

void wal_segment_open ( XLogReaderState state,
XLogSegNo  nextSegNo,
TimeLineID tli_p 
)

Definition at line 806 of file xlogutils.c.

808{
809 TimeLineID tli = *tli_p;
810 char path[MAXPGPATH];
811
812 XLogFilePath(path, tli, nextSegNo, state->segcxt.ws_segsize);
813 state->seg.ws_file = BasicOpenFile(path, O_RDONLY | PG_BINARY);
814 if (state->seg.ws_file >= 0)
815 return;
816
817 if (errno == ENOENT)
820 errmsg("requested WAL segment %s has already been removed",
821 path)));
822 else
825 errmsg("could not open file \"%s\": %m",
826 path)));
827}
#define PG_BINARY
Definition: c.h:1244
int errcode_for_file_access(void)
Definition: elog.c:877
int errmsg(const char *fmt,...)
Definition: elog.c:1071
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
int BasicOpenFile(const char *fileName, int fileFlags)
Definition: fd.c:1089
#define MAXPGPATH
static void XLogFilePath(char *path, TimeLineID tli, XLogSegNo logSegNo, int wal_segsz_bytes)
uint32 TimeLineID
Definition: xlogdefs.h:59

References BasicOpenFile(), ereport, errcode_for_file_access(), errmsg(), ERROR, MAXPGPATH, PG_BINARY, and XLogFilePath().

Referenced by create_logical_replication_slot(), InitXLogReaderState(), LogicalReplicationSlotHasPendingWal(), LogicalSlotAdvanceAndCheckSnapState(), pg_logical_slot_get_changes_guts(), SummarizeWAL(), and XlogReadTwoPhaseData().

◆ WALReadRaiseError()

void WALReadRaiseError ( WALReadError errinfo)

Definition at line 1011 of file xlogutils.c.

1012{
1013 WALOpenSegment *seg = &errinfo->wre_seg;
1014 char fname[MAXFNAMELEN];
1015
1016 XLogFileName(fname, seg->ws_tli, seg->ws_segno, wal_segment_size);
1017
1018 if (errinfo->wre_read < 0)
1019 {
1020 errno = errinfo->wre_errno;
1021 ereport(ERROR,
1023 errmsg("could not read from WAL segment %s, offset %d: %m",
1024 fname, errinfo->wre_off)));
1025 }
1026 else if (errinfo->wre_read == 0)
1027 {
1028 ereport(ERROR,
1030 errmsg("could not read from WAL segment %s, offset %d: read %d of %d",
1031 fname, errinfo->wre_off, errinfo->wre_read,
1032 errinfo->wre_req)));
1033 }
1034}
int errcode(int sqlerrcode)
Definition: elog.c:854
#define ERRCODE_DATA_CORRUPTED
Definition: pg_basebackup.c:41
XLogSegNo ws_segno
Definition: xlogreader.h:48
TimeLineID ws_tli
Definition: xlogreader.h:49
WALOpenSegment wre_seg
Definition: xlogreader.h:388
int wal_segment_size
Definition: xlog.c:143
#define MAXFNAMELEN
static void XLogFileName(char *fname, TimeLineID tli, XLogSegNo logSegNo, int wal_segsz_bytes)

References ereport, errcode(), ERRCODE_DATA_CORRUPTED, errcode_for_file_access(), errmsg(), ERROR, MAXFNAMELEN, wal_segment_size, WALReadError::wre_errno, WALReadError::wre_off, WALReadError::wre_read, WALReadError::wre_req, WALReadError::wre_seg, WALOpenSegment::ws_segno, WALOpenSegment::ws_tli, and XLogFileName().

Referenced by logical_read_xlog_page(), read_local_xlog_page_guts(), summarizer_read_local_xlog_page(), and XLogSendPhysical().

◆ XLogCheckInvalidPages()

void XLogCheckInvalidPages ( void  )

Definition at line 234 of file xlogutils.c.

235{
236 HASH_SEQ_STATUS status;
237 xl_invalid_page *hentry;
238 bool foundone = false;
239
240 if (invalid_page_tab == NULL)
241 return; /* nothing to do */
242
244
245 /*
246 * Our strategy is to emit WARNING messages for all remaining entries and
247 * only PANIC after we've dumped all the available info.
248 */
249 while ((hentry = (xl_invalid_page *) hash_seq_search(&status)) != NULL)
250 {
252 hentry->key.blkno, hentry->present);
253 foundone = true;
254 }
255
256 if (foundone)
258 "WAL contains references to invalid pages");
259
261 invalid_page_tab = NULL;
262}
void hash_destroy(HTAB *hashp)
Definition: dynahash.c:865
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1420
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1385
#define WARNING
Definition: elog.h:36
#define PANIC
Definition: elog.h:42
#define elog(elevel,...)
Definition: elog.h:226
BlockNumber blkno
Definition: xlogutils.c:69
RelFileLocator locator
Definition: xlogutils.c:67
ForkNumber forkno
Definition: xlogutils.c:68
xl_invalid_page_key key
Definition: xlogutils.c:74
bool ignore_invalid_pages
Definition: xlogutils.c:34
static void report_invalid_page(int elevel, RelFileLocator locator, ForkNumber forkno, BlockNumber blkno, bool present)
Definition: xlogutils.c:86
static HTAB * invalid_page_tab
Definition: xlogutils.c:78

References xl_invalid_page_key::blkno, elog, xl_invalid_page_key::forkno, hash_destroy(), hash_seq_init(), hash_seq_search(), ignore_invalid_pages, invalid_page_tab, xl_invalid_page::key, xl_invalid_page_key::locator, PANIC, xl_invalid_page::present, report_invalid_page(), and WARNING.

Referenced by CheckRecoveryConsistency().

◆ XLogDropDatabase()

void XLogDropDatabase ( Oid  dbid)

Definition at line 641 of file xlogutils.c.

642{
643 /*
644 * This is unnecessarily heavy-handed, as it will close SMgrRelation
645 * objects for other databases as well. DROP DATABASE occurs seldom enough
646 * that it's not worth introducing a variant of smgrdestroy for just this
647 * purpose.
648 */
650
652}
void smgrdestroyall(void)
Definition: smgr.c:386
static void forget_invalid_pages_db(Oid dbid)
Definition: xlogutils.c:196

References forget_invalid_pages_db(), and smgrdestroyall().

Referenced by dbase_redo().

◆ XLogDropRelation()

void XLogDropRelation ( RelFileLocator  rlocator,
ForkNumber  forknum 
)

Definition at line 630 of file xlogutils.c.

631{
632 forget_invalid_pages(rlocator, forknum, 0);
633}
static void forget_invalid_pages(RelFileLocator locator, ForkNumber forkno, BlockNumber minblkno)
Definition: xlogutils.c:165

References forget_invalid_pages().

Referenced by DropRelationFiles().

◆ XLogHaveInvalidPages()

bool XLogHaveInvalidPages ( void  )

Definition at line 224 of file xlogutils.c.

225{
226 if (invalid_page_tab != NULL &&
228 return true;
229 return false;
230}
long hash_get_num_entries(HTAB *hashp)
Definition: dynahash.c:1341

References hash_get_num_entries(), and invalid_page_tab.

Referenced by RecoveryRestartPoint().

◆ XLogInitBufferForRedo()

◆ XLogReadBufferExtended()

Buffer XLogReadBufferExtended ( RelFileLocator  rlocator,
ForkNumber  forknum,
BlockNumber  blkno,
ReadBufferMode  mode,
Buffer  recent_buffer 
)

Definition at line 460 of file xlogutils.c.

463{
464 BlockNumber lastblock;
465 Buffer buffer;
466 SMgrRelation smgr;
467
468 Assert(blkno != P_NEW);
469
470 /* Do we have a clue where the buffer might be already? */
471 if (BufferIsValid(recent_buffer) &&
472 mode == RBM_NORMAL &&
473 ReadRecentBuffer(rlocator, forknum, blkno, recent_buffer))
474 {
475 buffer = recent_buffer;
476 goto recent_buffer_fast_path;
477 }
478
479 /* Open the relation at smgr level */
480 smgr = smgropen(rlocator, INVALID_PROC_NUMBER);
481
482 /*
483 * Create the target file if it doesn't already exist. This lets us cope
484 * if the replay sequence contains writes to a relation that is later
485 * deleted. (The original coding of this routine would instead suppress
486 * the writes, but that seems like it risks losing valuable data if the
487 * filesystem loses an inode during a crash. Better to write the data
488 * until we are actually told to delete the file.)
489 */
490 smgrcreate(smgr, forknum, true);
491
492 lastblock = smgrnblocks(smgr, forknum);
493
494 if (blkno < lastblock)
495 {
496 /* page exists in file */
497 buffer = ReadBufferWithoutRelcache(rlocator, forknum, blkno,
498 mode, NULL, true);
499 }
500 else
501 {
502 /* hm, page doesn't exist in file */
503 if (mode == RBM_NORMAL)
504 {
505 log_invalid_page(rlocator, forknum, blkno, false);
506 return InvalidBuffer;
507 }
508 if (mode == RBM_NORMAL_NO_LOG)
509 return InvalidBuffer;
510 /* OK to extend the file */
511 /* we do this in recovery only - no rel-extension lock needed */
513 buffer = ExtendBufferedRelTo(BMR_SMGR(smgr, RELPERSISTENCE_PERMANENT),
514 forknum,
515 NULL,
518 blkno + 1,
519 mode);
520 }
521
522recent_buffer_fast_path:
523 if (mode == RBM_NORMAL)
524 {
525 /* check that page has been initialized */
526 Page page = (Page) BufferGetPage(buffer);
527
528 /*
529 * We assume that PageIsNew is safe without a lock. During recovery,
530 * there should be no other backends that could modify the buffer at
531 * the same time.
532 */
533 if (PageIsNew(page))
534 {
535 ReleaseBuffer(buffer);
536 log_invalid_page(rlocator, forknum, blkno, true);
537 return InvalidBuffer;
538 }
539 }
540
541 return buffer;
542}
uint32 BlockNumber
Definition: block.h:31
#define InvalidBuffer
Definition: buf.h:25
Buffer ExtendBufferedRelTo(BufferManagerRelation bmr, ForkNumber fork, BufferAccessStrategy strategy, uint32 flags, BlockNumber extend_to, ReadBufferMode mode)
Definition: bufmgr.c:922
void ReleaseBuffer(Buffer buffer)
Definition: bufmgr.c:5373
Buffer ReadBufferWithoutRelcache(RelFileLocator rlocator, ForkNumber forkNum, BlockNumber blockNum, ReadBufferMode mode, BufferAccessStrategy strategy, bool permanent)
Definition: bufmgr.c:842
bool ReadRecentBuffer(RelFileLocator rlocator, ForkNumber forkNum, BlockNumber blockNum, Buffer recent_buffer)
Definition: bufmgr.c:682
#define P_NEW
Definition: bufmgr.h:191
static Page BufferGetPage(Buffer buffer)
Definition: bufmgr.h:417
#define BMR_SMGR(p_smgr, p_relpersistence)
Definition: bufmgr.h:109
@ EB_PERFORMING_RECOVERY
Definition: bufmgr.h:78
@ EB_SKIP_EXTENSION_LOCK
Definition: bufmgr.h:75
@ RBM_NORMAL
Definition: bufmgr.h:46
@ RBM_NORMAL_NO_LOG
Definition: bufmgr.h:52
static bool BufferIsValid(Buffer bufnum)
Definition: bufmgr.h:368
static bool PageIsNew(const PageData *page)
Definition: bufpage.h:234
PageData * Page
Definition: bufpage.h:82
Assert(PointerIsAligned(start, uint64))
static PgChecksumMode mode
Definition: pg_checksums.c:55
BlockNumber smgrnblocks(SMgrRelation reln, ForkNumber forknum)
Definition: smgr.c:819
void smgrcreate(SMgrRelation reln, ForkNumber forknum, bool isRedo)
Definition: smgr.c:481
bool InRecovery
Definition: xlogutils.c:50
static void log_invalid_page(RelFileLocator locator, ForkNumber forkno, BlockNumber blkno, bool present)
Definition: xlogutils.c:101

References Assert(), BMR_SMGR, BufferGetPage(), BufferIsValid(), EB_PERFORMING_RECOVERY, EB_SKIP_EXTENSION_LOCK, ExtendBufferedRelTo(), InRecovery, INVALID_PROC_NUMBER, InvalidBuffer, log_invalid_page(), mode, P_NEW, PageIsNew(), RBM_NORMAL, RBM_NORMAL_NO_LOG, ReadBufferWithoutRelcache(), ReadRecentBuffer(), ReleaseBuffer(), smgrcreate(), smgrnblocks(), and smgropen().

Referenced by verifyBackupPageConsistency(), XLogReadBufferForRedoExtended(), and XLogRecordPageWithFreeSpace().

◆ XLogReadBufferForRedo()

XLogRedoAction XLogReadBufferForRedo ( XLogReaderState record,
uint8  block_id,
Buffer buf 
)

Definition at line 303 of file xlogutils.c.

305{
306 return XLogReadBufferForRedoExtended(record, block_id, RBM_NORMAL,
307 false, buf);
308}

References buf, RBM_NORMAL, and XLogReadBufferForRedoExtended().

Referenced by _bt_clear_incomplete_split(), brin_xlog_desummarize_page(), brin_xlog_insert_update(), brin_xlog_revmap_extend(), brin_xlog_samepage_update(), brin_xlog_update(), btree_xlog_dedup(), btree_xlog_delete(), btree_xlog_insert(), btree_xlog_mark_page_halfdead(), btree_xlog_split(), btree_xlog_unlink_page(), generic_redo(), ginRedoClearIncompleteSplit(), ginRedoDeletePage(), ginRedoInsert(), ginRedoSplit(), ginRedoUpdateMetapage(), ginRedoVacuumDataLeafPage(), ginRedoVacuumPage(), gistRedoClearFollowRight(), gistRedoDeleteRecord(), gistRedoPageDelete(), gistRedoPageUpdateRecord(), hash_xlog_add_ovfl_page(), hash_xlog_delete(), hash_xlog_init_bitmap_page(), hash_xlog_insert(), hash_xlog_move_page_contents(), hash_xlog_split_allocate_page(), hash_xlog_split_cleanup(), hash_xlog_split_complete(), hash_xlog_split_page(), hash_xlog_squeeze_page(), hash_xlog_update_meta_page(), hash_xlog_vacuum_one_page(), heap_xlog_confirm(), heap_xlog_delete(), heap_xlog_inplace(), heap_xlog_insert(), heap_xlog_lock(), heap_xlog_lock_updated(), heap_xlog_multi_insert(), heap_xlog_update(), heap_xlog_visible(), spgRedoAddLeaf(), spgRedoAddNode(), spgRedoMoveLeafs(), spgRedoPickSplit(), spgRedoSplitTuple(), spgRedoVacuumLeaf(), spgRedoVacuumRedirect(), spgRedoVacuumRoot(), and xlog_redo().

◆ XLogReadBufferForRedoExtended()

XLogRedoAction XLogReadBufferForRedoExtended ( XLogReaderState record,
uint8  block_id,
ReadBufferMode  mode,
bool  get_cleanup_lock,
Buffer buf 
)

Definition at line 340 of file xlogutils.c.

344{
345 XLogRecPtr lsn = record->EndRecPtr;
346 RelFileLocator rlocator;
347 ForkNumber forknum;
348 BlockNumber blkno;
349 Buffer prefetch_buffer;
350 Page page;
351 bool zeromode;
352 bool willinit;
353
354 if (!XLogRecGetBlockTagExtended(record, block_id, &rlocator, &forknum, &blkno,
355 &prefetch_buffer))
356 {
357 /* Caller specified a bogus block_id */
358 elog(PANIC, "failed to locate backup block with ID %d in WAL record",
359 block_id);
360 }
361
362 /*
363 * Make sure that if the block is marked with WILL_INIT, the caller is
364 * going to initialize it. And vice versa.
365 */
367 willinit = (XLogRecGetBlock(record, block_id)->flags & BKPBLOCK_WILL_INIT) != 0;
368 if (willinit && !zeromode)
369 elog(PANIC, "block with WILL_INIT flag in WAL record must be zeroed by redo routine");
370 if (!willinit && zeromode)
371 elog(PANIC, "block to be initialized in redo routine must be marked with WILL_INIT flag in the WAL record");
372
373 /* If it has a full-page image and it should be restored, do it. */
374 if (XLogRecBlockImageApply(record, block_id))
375 {
376 Assert(XLogRecHasBlockImage(record, block_id));
377 *buf = XLogReadBufferExtended(rlocator, forknum, blkno,
378 get_cleanup_lock ? RBM_ZERO_AND_CLEANUP_LOCK : RBM_ZERO_AND_LOCK,
379 prefetch_buffer);
380 page = BufferGetPage(*buf);
381 if (!RestoreBlockImage(record, block_id, page))
383 (errcode(ERRCODE_INTERNAL_ERROR),
384 errmsg_internal("%s", record->errormsg_buf)));
385
386 /*
387 * The page may be uninitialized. If so, we can't set the LSN because
388 * that would corrupt the page.
389 */
390 if (!PageIsNew(page))
391 {
392 PageSetLSN(page, lsn);
393 }
394
396
397 /*
398 * At the end of crash recovery the init forks of unlogged relations
399 * are copied, without going through shared buffers. So we need to
400 * force the on-disk state of init forks to always be in sync with the
401 * state in shared buffers.
402 */
403 if (forknum == INIT_FORKNUM)
405
406 return BLK_RESTORED;
407 }
408 else
409 {
410 *buf = XLogReadBufferExtended(rlocator, forknum, blkno, mode, prefetch_buffer);
411 if (BufferIsValid(*buf))
412 {
414 {
415 if (get_cleanup_lock)
417 else
419 }
420 if (lsn <= PageGetLSN(BufferGetPage(*buf)))
421 return BLK_DONE;
422 else
423 return BLK_NEEDS_REDO;
424 }
425 else
426 return BLK_NOTFOUND;
427 }
428}
void MarkBufferDirty(Buffer buffer)
Definition: bufmgr.c:2952
void LockBufferForCleanup(Buffer buffer)
Definition: bufmgr.c:5687
void LockBuffer(Buffer buffer, int mode)
Definition: bufmgr.c:5607
void FlushOneBuffer(Buffer buffer)
Definition: bufmgr.c:5353
#define BUFFER_LOCK_EXCLUSIVE
Definition: bufmgr.h:198
@ RBM_ZERO_AND_CLEANUP_LOCK
Definition: bufmgr.h:49
static void PageSetLSN(Page page, XLogRecPtr lsn)
Definition: bufpage.h:391
static XLogRecPtr PageGetLSN(const PageData *page)
Definition: bufpage.h:386
int errmsg_internal(const char *fmt,...)
Definition: elog.c:1158
ForkNumber
Definition: relpath.h:56
@ INIT_FORKNUM
Definition: relpath.h:61
char * errormsg_buf
Definition: xlogreader.h:311
XLogRecPtr EndRecPtr
Definition: xlogreader.h:207
uint64 XLogRecPtr
Definition: xlogdefs.h:21
bool XLogRecGetBlockTagExtended(XLogReaderState *record, uint8 block_id, RelFileLocator *rlocator, ForkNumber *forknum, BlockNumber *blknum, Buffer *prefetch_buffer)
Definition: xlogreader.c:2007
bool RestoreBlockImage(XLogReaderState *record, uint8 block_id, char *page)
Definition: xlogreader.c:2066
#define XLogRecBlockImageApply(decoder, block_id)
Definition: xlogreader.h:425
#define XLogRecGetBlock(decoder, i)
Definition: xlogreader.h:419
#define XLogRecHasBlockImage(decoder, block_id)
Definition: xlogreader.h:423
#define BKPBLOCK_WILL_INIT
Definition: xlogrecord.h:199
Buffer XLogReadBufferExtended(RelFileLocator rlocator, ForkNumber forknum, BlockNumber blkno, ReadBufferMode mode, Buffer recent_buffer)
Definition: xlogutils.c:460

References Assert(), BKPBLOCK_WILL_INIT, BLK_DONE, BLK_NEEDS_REDO, BLK_NOTFOUND, BLK_RESTORED, buf, BUFFER_LOCK_EXCLUSIVE, BufferGetPage(), BufferIsValid(), elog, XLogReaderState::EndRecPtr, ereport, errcode(), errmsg_internal(), ERROR, XLogReaderState::errormsg_buf, FlushOneBuffer(), INIT_FORKNUM, LockBuffer(), LockBufferForCleanup(), MarkBufferDirty(), mode, PageGetLSN(), PageIsNew(), PageSetLSN(), PANIC, RBM_ZERO_AND_CLEANUP_LOCK, RBM_ZERO_AND_LOCK, RestoreBlockImage(), XLogReadBufferExtended(), XLogRecBlockImageApply, XLogRecGetBlock, XLogRecGetBlockTagExtended(), and XLogRecHasBlockImage.

Referenced by btree_xlog_vacuum(), hash_xlog_delete(), hash_xlog_move_page_contents(), hash_xlog_split_allocate_page(), hash_xlog_squeeze_page(), hash_xlog_vacuum_one_page(), heap_xlog_prune_freeze(), heap_xlog_visible(), XLogInitBufferForRedo(), and XLogReadBufferForRedo().

◆ XLogReadDetermineTimeline()

void XLogReadDetermineTimeline ( XLogReaderState state,
XLogRecPtr  wantPage,
uint32  wantLength,
TimeLineID  currTLI 
)

Definition at line 707 of file xlogutils.c.

709{
710 const XLogRecPtr lastReadPage = (state->seg.ws_segno *
711 state->segcxt.ws_segsize + state->segoff);
712
713 Assert(wantPage != InvalidXLogRecPtr && wantPage % XLOG_BLCKSZ == 0);
714 Assert(wantLength <= XLOG_BLCKSZ);
715 Assert(state->readLen == 0 || state->readLen <= XLOG_BLCKSZ);
716 Assert(currTLI != 0);
717
718 /*
719 * If the desired page is currently read in and valid, we have nothing to
720 * do.
721 *
722 * The caller should've ensured that it didn't previously advance readOff
723 * past the valid limit of this timeline, so it doesn't matter if the
724 * current TLI has since become historical.
725 */
726 if (lastReadPage == wantPage &&
727 state->readLen != 0 &&
728 lastReadPage + state->readLen >= wantPage + Min(wantLength, XLOG_BLCKSZ - 1))
729 return;
730
731 /*
732 * If we're reading from the current timeline, it hasn't become historical
733 * and the page we're reading is after the last page read, we can again
734 * just carry on. (Seeking backwards requires a check to make sure the
735 * older page isn't on a prior timeline).
736 *
737 * currTLI might've become historical since the caller obtained the value,
738 * but the caller is required not to read past the flush limit it saw at
739 * the time it looked up the timeline. There's nothing we can do about it
740 * if StartupXLOG() renames it to .partial concurrently.
741 */
742 if (state->currTLI == currTLI && wantPage >= lastReadPage)
743 {
744 Assert(state->currTLIValidUntil == InvalidXLogRecPtr);
745 return;
746 }
747
748 /*
749 * If we're just reading pages from a previously validated historical
750 * timeline and the timeline we're reading from is valid until the end of
751 * the current segment we can just keep reading.
752 */
753 if (state->currTLIValidUntil != InvalidXLogRecPtr &&
754 state->currTLI != currTLI &&
755 state->currTLI != 0 &&
756 ((wantPage + wantLength) / state->segcxt.ws_segsize) <
757 (state->currTLIValidUntil / state->segcxt.ws_segsize))
758 return;
759
760 /*
761 * If we reach this point we're either looking up a page for random
762 * access, the current timeline just became historical, or we're reading
763 * from a new segment containing a timeline switch. In all cases we need
764 * to determine the newest timeline on the segment.
765 *
766 * If it's the current timeline we can just keep reading from here unless
767 * we detect a timeline switch that makes the current timeline historical.
768 * If it's a historical timeline we can read all the segment on the newest
769 * timeline because it contains all the old timelines' data too. So only
770 * one switch check is required.
771 */
772 {
773 /*
774 * We need to re-read the timeline history in case it's been changed
775 * by a promotion or replay from a cascaded replica.
776 */
777 List *timelineHistory = readTimeLineHistory(currTLI);
778 XLogRecPtr endOfSegment;
779
780 endOfSegment = ((wantPage / state->segcxt.ws_segsize) + 1) *
781 state->segcxt.ws_segsize - 1;
782 Assert(wantPage / state->segcxt.ws_segsize ==
783 endOfSegment / state->segcxt.ws_segsize);
784
785 /*
786 * Find the timeline of the last LSN on the segment containing
787 * wantPage.
788 */
789 state->currTLI = tliOfPointInHistory(endOfSegment, timelineHistory);
790 state->currTLIValidUntil = tliSwitchPoint(state->currTLI, timelineHistory,
791 &state->nextTLI);
792
793 Assert(state->currTLIValidUntil == InvalidXLogRecPtr ||
794 wantPage + wantLength < state->currTLIValidUntil);
795
796 list_free_deep(timelineHistory);
797
798 elog(DEBUG3, "switched to timeline %u valid until %X/%X",
799 state->currTLI,
800 LSN_FORMAT_ARGS(state->currTLIValidUntil));
801 }
802}
List * readTimeLineHistory(TimeLineID targetTLI)
Definition: timeline.c:76
TimeLineID tliOfPointInHistory(XLogRecPtr ptr, List *history)
Definition: timeline.c:544
XLogRecPtr tliSwitchPoint(TimeLineID tli, List *history, TimeLineID *nextTLI)
Definition: timeline.c:572
#define Min(x, y)
Definition: c.h:975
#define DEBUG3
Definition: elog.h:28
void list_free_deep(List *list)
Definition: list.c:1560
Definition: pg_list.h:54
#define LSN_FORMAT_ARGS(lsn)
Definition: xlogdefs.h:43
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28

References Assert(), DEBUG3, elog, InvalidXLogRecPtr, list_free_deep(), LSN_FORMAT_ARGS, Min, readTimeLineHistory(), tliOfPointInHistory(), and tliSwitchPoint().

Referenced by logical_read_xlog_page(), and read_local_xlog_page_guts().

◆ XLogTruncateRelation()

void XLogTruncateRelation ( RelFileLocator  rlocator,
ForkNumber  forkNum,
BlockNumber  nblocks 
)

Definition at line 660 of file xlogutils.c.

662{
663 forget_invalid_pages(rlocator, forkNum, nblocks);
664}

References forget_invalid_pages().

Referenced by smgr_redo().

Variable Documentation

◆ ignore_invalid_pages

PGDLLIMPORT bool ignore_invalid_pages
extern

Definition at line 34 of file xlogutils.c.

Referenced by log_invalid_page(), and XLogCheckInvalidPages().

◆ InRecovery

◆ standbyState