PostgreSQL Source Code  git master
xloginsert.c File Reference
#include "postgres.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "access/xlog_internal.h"
#include "access/xloginsert.h"
#include "catalog/pg_control.h"
#include "common/pg_lzcompress.h"
#include "miscadmin.h"
#include "pg_trace.h"
#include "replication/origin.h"
#include "storage/bufmgr.h"
#include "storage/proc.h"
#include "utils/memutils.h"
Include dependency graph for xloginsert.c:

Go to the source code of this file.

Data Structures

struct  registered_buffer
 

Macros

#define LZ4_MAX_BLCKSZ   0
 
#define ZSTD_MAX_BLCKSZ   0
 
#define PGLZ_MAX_BLCKSZ   PGLZ_MAX_OUTPUT(BLCKSZ)
 
#define COMPRESS_BUFSIZE   Max(Max(PGLZ_MAX_BLCKSZ, LZ4_MAX_BLCKSZ), ZSTD_MAX_BLCKSZ)
 
#define SizeOfXlogOrigin   (sizeof(RepOriginId) + sizeof(char))
 
#define SizeOfXLogTransactionId   (sizeof(TransactionId) + sizeof(char))
 
#define HEADER_SCRATCH_SIZE
 

Functions

static XLogRecDataXLogRecordAssemble (RmgrId rmid, uint8 info, XLogRecPtr RedoRecPtr, bool doPageWrites, XLogRecPtr *fpw_lsn, int *num_fpi, bool *topxid_included)
 
static bool XLogCompressBackupBlock (char *page, uint16 hole_offset, uint16 hole_length, char *dest, uint16 *dlen)
 
void XLogBeginInsert (void)
 
void XLogEnsureRecordSpace (int max_block_id, int ndatas)
 
void XLogResetInsertion (void)
 
void XLogRegisterBuffer (uint8 block_id, Buffer buffer, uint8 flags)
 
void XLogRegisterBlock (uint8 block_id, RelFileLocator *rlocator, ForkNumber forknum, BlockNumber blknum, Page page, uint8 flags)
 
void XLogRegisterData (char *data, uint32 len)
 
void XLogRegisterBufData (uint8 block_id, char *data, uint32 len)
 
void XLogSetRecordFlags (uint8 flags)
 
XLogRecPtr XLogInsert (RmgrId rmid, uint8 info)
 
bool XLogCheckBufferNeedsBackup (Buffer buffer)
 
XLogRecPtr XLogSaveBufferForHint (Buffer buffer, bool buffer_std)
 
XLogRecPtr log_newpage (RelFileLocator *rlocator, ForkNumber forknum, BlockNumber blkno, Page page, bool page_std)
 
void log_newpages (RelFileLocator *rlocator, ForkNumber forknum, int num_pages, BlockNumber *blknos, Page *pages, bool page_std)
 
XLogRecPtr log_newpage_buffer (Buffer buffer, bool page_std)
 
void log_newpage_range (Relation rel, ForkNumber forknum, BlockNumber startblk, BlockNumber endblk, bool page_std)
 
void InitXLogInsert (void)
 

Variables

static registered_bufferregistered_buffers
 
static int max_registered_buffers
 
static int max_registered_block_id = 0
 
static XLogRecDatamainrdata_head
 
static XLogRecDatamainrdata_last = (XLogRecData *) &mainrdata_head
 
static uint64 mainrdata_len
 
static uint8 curinsert_flags = 0
 
static XLogRecData hdr_rdt
 
static char * hdr_scratch = NULL
 
static XLogRecDatardatas
 
static int num_rdatas
 
static int max_rdatas
 
static bool begininsert_called = false
 
static MemoryContext xloginsert_cxt
 

Macro Definition Documentation

◆ COMPRESS_BUFSIZE

#define COMPRESS_BUFSIZE   Max(Max(PGLZ_MAX_BLCKSZ, LZ4_MAX_BLCKSZ), ZSTD_MAX_BLCKSZ)

Definition at line 62 of file xloginsert.c.

◆ HEADER_SCRATCH_SIZE

#define HEADER_SCRATCH_SIZE
Value:
MaxSizeOfXLogRecordBlockHeader * (XLR_MAX_BLOCK_ID + 1) + \
#define SizeOfXlogOrigin
Definition: xloginsert.c:116
#define SizeOfXLogTransactionId
Definition: xloginsert.c:117
#define XLR_MAX_BLOCK_ID
Definition: xlogrecord.h:239
#define SizeOfXLogRecordDataHeaderLong
Definition: xlogrecord.h:225
#define SizeOfXLogRecord
Definition: xlogrecord.h:55

Definition at line 119 of file xloginsert.c.

◆ LZ4_MAX_BLCKSZ

#define LZ4_MAX_BLCKSZ   0

Definition at line 50 of file xloginsert.c.

◆ PGLZ_MAX_BLCKSZ

#define PGLZ_MAX_BLCKSZ   PGLZ_MAX_OUTPUT(BLCKSZ)

Definition at line 59 of file xloginsert.c.

◆ SizeOfXlogOrigin

#define SizeOfXlogOrigin   (sizeof(RepOriginId) + sizeof(char))

Definition at line 116 of file xloginsert.c.

◆ SizeOfXLogTransactionId

#define SizeOfXLogTransactionId   (sizeof(TransactionId) + sizeof(char))

Definition at line 117 of file xloginsert.c.

◆ ZSTD_MAX_BLCKSZ

#define ZSTD_MAX_BLCKSZ   0

Definition at line 56 of file xloginsert.c.

Function Documentation

◆ InitXLogInsert()

void InitXLogInsert ( void  )

Definition at line 1348 of file xloginsert.c.

1349 {
1350 #ifdef USE_ASSERT_CHECKING
1351 
1352  /*
1353  * Check that any records assembled can be decoded. This is capped based
1354  * on what XLogReader would require at its maximum bound. The XLOG_BLCKSZ
1355  * addend covers the larger allocate_recordbuf() demand. This code path
1356  * is called once per backend, more than enough for this check.
1357  */
1358  size_t max_required =
1360 
1361  Assert(AllocSizeIsValid(max_required));
1362 #endif
1363 
1364  /* Initialize the working areas */
1365  if (xloginsert_cxt == NULL)
1366  {
1368  "WAL record construction",
1370  }
1371 
1372  if (registered_buffers == NULL)
1373  {
1376  sizeof(registered_buffer) * (XLR_NORMAL_MAX_BLOCK_ID + 1));
1378  }
1379  if (rdatas == NULL)
1380  {
1382  sizeof(XLogRecData) * XLR_NORMAL_RDATAS);
1384  }
1385 
1386  /*
1387  * Allocate a buffer to hold the header information for a WAL record.
1388  */
1389  if (hdr_scratch == NULL)
1392 }
#define Assert(condition)
Definition: c.h:858
MemoryContext TopMemoryContext
Definition: mcxt.c:149
void * MemoryContextAllocZero(MemoryContext context, Size size)
Definition: mcxt.c:1215
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:1181
#define AllocSetContextCreate
Definition: memutils.h:129
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:160
#define AllocSizeIsValid(size)
Definition: memutils.h:42
static int max_registered_buffers
Definition: xloginsert.c:90
static MemoryContext xloginsert_cxt
Definition: xloginsert.c:135
static char * hdr_scratch
Definition: xloginsert.c:114
static XLogRecData * rdatas
Definition: xloginsert.c:128
static registered_buffer * registered_buffers
Definition: xloginsert.c:89
static int max_rdatas
Definition: xloginsert.c:130
#define HEADER_SCRATCH_SIZE
Definition: xloginsert.c:119
#define XLR_NORMAL_MAX_BLOCK_ID
Definition: xloginsert.h:27
#define XLR_NORMAL_RDATAS
Definition: xloginsert.h:28
size_t DecodeXLogRecordRequiredSpace(size_t xl_tot_len)
Definition: xlogreader.c:1629
#define XLogRecordMaxSize
Definition: xlogrecord.h:74

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, AllocSizeIsValid, Assert, DecodeXLogRecordRequiredSpace(), hdr_scratch, HEADER_SCRATCH_SIZE, max_rdatas, max_registered_buffers, MemoryContextAlloc(), MemoryContextAllocZero(), rdatas, registered_buffers, TopMemoryContext, xloginsert_cxt, XLogRecordMaxSize, XLR_NORMAL_MAX_BLOCK_ID, and XLR_NORMAL_RDATAS.

Referenced by BaseInit().

◆ log_newpage()

XLogRecPtr log_newpage ( RelFileLocator rlocator,
ForkNumber  forknum,
BlockNumber  blkno,
Page  page,
bool  page_std 
)

Definition at line 1143 of file xloginsert.c.

1145 {
1146  int flags;
1147  XLogRecPtr recptr;
1148 
1149  flags = REGBUF_FORCE_IMAGE;
1150  if (page_std)
1151  flags |= REGBUF_STANDARD;
1152 
1153  XLogBeginInsert();
1154  XLogRegisterBlock(0, rlocator, forknum, blkno, page, flags);
1155  recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI);
1156 
1157  /*
1158  * The page may be uninitialized. If so, we can't set the LSN because that
1159  * would corrupt the page.
1160  */
1161  if (!PageIsNew(page))
1162  {
1163  PageSetLSN(page, recptr);
1164  }
1165 
1166  return recptr;
1167 }
static bool PageIsNew(Page page)
Definition: bufpage.h:233
static void PageSetLSN(Page page, XLogRecPtr lsn)
Definition: bufpage.h:391
#define XLOG_FPI
Definition: pg_control.h:79
uint64 XLogRecPtr
Definition: xlogdefs.h:21
void XLogRegisterBlock(uint8 block_id, RelFileLocator *rlocator, ForkNumber forknum, BlockNumber blknum, Page page, uint8 flags)
Definition: xloginsert.c:309
XLogRecPtr XLogInsert(RmgrId rmid, uint8 info)
Definition: xloginsert.c:474
void XLogBeginInsert(void)
Definition: xloginsert.c:149
#define REGBUF_STANDARD
Definition: xloginsert.h:34
#define REGBUF_FORCE_IMAGE
Definition: xloginsert.h:31

References PageIsNew(), PageSetLSN(), REGBUF_FORCE_IMAGE, REGBUF_STANDARD, XLOG_FPI, XLogBeginInsert(), XLogInsert(), and XLogRegisterBlock().

Referenced by _hash_alloc_buckets(), _hash_init(), and log_newpage_buffer().

◆ log_newpage_buffer()

XLogRecPtr log_newpage_buffer ( Buffer  buffer,
bool  page_std 
)

Definition at line 1237 of file xloginsert.c.

1238 {
1239  Page page = BufferGetPage(buffer);
1240  RelFileLocator rlocator;
1241  ForkNumber forknum;
1242  BlockNumber blkno;
1243 
1244  /* Shared buffers should be modified in a critical section. */
1245  Assert(CritSectionCount > 0);
1246 
1247  BufferGetTag(buffer, &rlocator, &forknum, &blkno);
1248 
1249  return log_newpage(&rlocator, forknum, blkno, page, page_std);
1250 }
uint32 BlockNumber
Definition: block.h:31
void BufferGetTag(Buffer buffer, RelFileLocator *rlocator, ForkNumber *forknum, BlockNumber *blknum)
Definition: bufmgr.c:3757
static Page BufferGetPage(Buffer buffer)
Definition: bufmgr.h:400
Pointer Page
Definition: bufpage.h:81
volatile uint32 CritSectionCount
Definition: globals.c:44
ForkNumber
Definition: relpath.h:48
XLogRecPtr log_newpage(RelFileLocator *rlocator, ForkNumber forknum, BlockNumber blkno, Page page, bool page_std)
Definition: xloginsert.c:1143

References Assert, BufferGetPage(), BufferGetTag(), CritSectionCount, and log_newpage().

Referenced by brin_initialize_empty_new_buffer(), brinbuildempty(), FreeSpaceMapPrepareTruncateRel(), ginbuildempty(), gistbuildempty(), heap_force_common(), lazy_scan_new_or_empty(), RelationCopyStorageUsingBuffer(), and visibilitymap_prepare_truncate().

◆ log_newpage_range()

void log_newpage_range ( Relation  rel,
ForkNumber  forknum,
BlockNumber  startblk,
BlockNumber  endblk,
bool  page_std 
)

Definition at line 1270 of file xloginsert.c.

1273 {
1274  int flags;
1275  BlockNumber blkno;
1276 
1277  flags = REGBUF_FORCE_IMAGE;
1278  if (page_std)
1279  flags |= REGBUF_STANDARD;
1280 
1281  /*
1282  * Iterate over all the pages in the range. They are collected into
1283  * batches of XLR_MAX_BLOCK_ID pages, and a single WAL-record is written
1284  * for each batch.
1285  */
1287 
1288  blkno = startblk;
1289  while (blkno < endblk)
1290  {
1291  Buffer bufpack[XLR_MAX_BLOCK_ID];
1292  XLogRecPtr recptr;
1293  int nbufs;
1294  int i;
1295 
1297 
1298  /* Collect a batch of blocks. */
1299  nbufs = 0;
1300  while (nbufs < XLR_MAX_BLOCK_ID && blkno < endblk)
1301  {
1302  Buffer buf = ReadBufferExtended(rel, forknum, blkno,
1303  RBM_NORMAL, NULL);
1304 
1306 
1307  /*
1308  * Completely empty pages are not WAL-logged. Writing a WAL record
1309  * would change the LSN, and we don't want that. We want the page
1310  * to stay empty.
1311  */
1312  if (!PageIsNew(BufferGetPage(buf)))
1313  bufpack[nbufs++] = buf;
1314  else
1316  blkno++;
1317  }
1318 
1319  /* Nothing more to do if all remaining blocks were empty. */
1320  if (nbufs == 0)
1321  break;
1322 
1323  /* Write WAL record for this batch. */
1324  XLogBeginInsert();
1325 
1327  for (i = 0; i < nbufs; i++)
1328  {
1329  MarkBufferDirty(bufpack[i]);
1330  XLogRegisterBuffer(i, bufpack[i], flags);
1331  }
1332 
1333  recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI);
1334 
1335  for (i = 0; i < nbufs; i++)
1336  {
1337  PageSetLSN(BufferGetPage(bufpack[i]), recptr);
1338  UnlockReleaseBuffer(bufpack[i]);
1339  }
1340  END_CRIT_SECTION();
1341  }
1342 }
int Buffer
Definition: buf.h:23
void UnlockReleaseBuffer(Buffer buffer)
Definition: bufmgr.c:4953
void MarkBufferDirty(Buffer buffer)
Definition: bufmgr.c:2543
void LockBuffer(Buffer buffer, int mode)
Definition: bufmgr.c:5171
Buffer ReadBufferExtended(Relation reln, ForkNumber forkNum, BlockNumber blockNum, ReadBufferMode mode, BufferAccessStrategy strategy)
Definition: bufmgr.c:820
#define BUFFER_LOCK_EXCLUSIVE
Definition: bufmgr.h:191
@ RBM_NORMAL
Definition: bufmgr.h:45
int i
Definition: isn.c:73
#define START_CRIT_SECTION()
Definition: miscadmin.h:149
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:122
#define END_CRIT_SECTION()
Definition: miscadmin.h:151
static char * buf
Definition: pg_test_fsync.c:73
void XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
Definition: xloginsert.c:242
void XLogEnsureRecordSpace(int max_block_id, int ndatas)
Definition: xloginsert.c:175

References buf, BUFFER_LOCK_EXCLUSIVE, BufferGetPage(), CHECK_FOR_INTERRUPTS, END_CRIT_SECTION, i, LockBuffer(), MarkBufferDirty(), PageIsNew(), PageSetLSN(), RBM_NORMAL, ReadBufferExtended(), REGBUF_FORCE_IMAGE, REGBUF_STANDARD, START_CRIT_SECTION, UnlockReleaseBuffer(), XLOG_FPI, XLogBeginInsert(), XLogEnsureRecordSpace(), XLogInsert(), XLogRegisterBuffer(), and XLR_MAX_BLOCK_ID.

Referenced by ginbuild(), gistbuild(), smgrDoPendingSyncs(), and spgbuild().

◆ log_newpages()

void log_newpages ( RelFileLocator rlocator,
ForkNumber  forknum,
int  num_pages,
BlockNumber blknos,
Page pages,
bool  page_std 
)

Definition at line 1175 of file xloginsert.c.

1177 {
1178  int flags;
1179  XLogRecPtr recptr;
1180  int i;
1181  int j;
1182 
1183  flags = REGBUF_FORCE_IMAGE;
1184  if (page_std)
1185  flags |= REGBUF_STANDARD;
1186 
1187  /*
1188  * Iterate over all the pages. They are collected into batches of
1189  * XLR_MAX_BLOCK_ID pages, and a single WAL-record is written for each
1190  * batch.
1191  */
1193 
1194  i = 0;
1195  while (i < num_pages)
1196  {
1197  int batch_start = i;
1198  int nbatch;
1199 
1200  XLogBeginInsert();
1201 
1202  nbatch = 0;
1203  while (nbatch < XLR_MAX_BLOCK_ID && i < num_pages)
1204  {
1205  XLogRegisterBlock(nbatch, rlocator, forknum, blknos[i], pages[i], flags);
1206  i++;
1207  nbatch++;
1208  }
1209 
1210  recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI);
1211 
1212  for (j = batch_start; j < i; j++)
1213  {
1214  /*
1215  * The page may be uninitialized. If so, we can't set the LSN
1216  * because that would corrupt the page.
1217  */
1218  if (!PageIsNew(pages[j]))
1219  {
1220  PageSetLSN(pages[j], recptr);
1221  }
1222  }
1223  }
1224 }
int j
Definition: isn.c:74

References i, j, PageIsNew(), PageSetLSN(), REGBUF_FORCE_IMAGE, REGBUF_STANDARD, XLOG_FPI, XLogBeginInsert(), XLogEnsureRecordSpace(), XLogInsert(), XLogRegisterBlock(), and XLR_MAX_BLOCK_ID.

Referenced by smgr_bulk_flush().

◆ XLogBeginInsert()

void XLogBeginInsert ( void  )

Definition at line 149 of file xloginsert.c.

150 {
153  Assert(mainrdata_len == 0);
154 
155  /* cross-check on whether we should be here or not */
156  if (!XLogInsertAllowed())
157  elog(ERROR, "cannot make new WAL entries during recovery");
158 
159  if (begininsert_called)
160  elog(ERROR, "XLogBeginInsert was already called");
161 
162  begininsert_called = true;
163 }
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:224
bool XLogInsertAllowed(void)
Definition: xlog.c:6345
static XLogRecData * mainrdata_head
Definition: xloginsert.c:98
static uint64 mainrdata_len
Definition: xloginsert.c:100
static bool begininsert_called
Definition: xloginsert.c:132
static int max_registered_block_id
Definition: xloginsert.c:91
static XLogRecData * mainrdata_last
Definition: xloginsert.c:99

References Assert, begininsert_called, elog, ERROR, mainrdata_head, mainrdata_last, mainrdata_len, max_registered_block_id, and XLogInsertAllowed().

Referenced by _bt_allocbuf(), _bt_dedup_pass(), _bt_delitems_delete(), _bt_delitems_vacuum(), _bt_getroot(), _bt_insertonpg(), _bt_mark_page_halfdead(), _bt_newlevel(), _bt_set_cleanup_info(), _bt_split(), _bt_unlink_halfdead_page(), _hash_addovflpage(), _hash_doinsert(), _hash_expandtable(), _hash_freeovflpage(), _hash_init(), _hash_splitbucket(), _hash_squeezebucket(), _hash_vacuum_one_page(), addLeafTuple(), AssignTransactionId(), brin_doinsert(), brin_doupdate(), brinbuild(), brinRevmapDesummarizeRange(), CreateCheckPoint(), CreateDatabaseUsingFileCopy(), CreateDirAndVersionFile(), CreateEndOfRecoveryRecord(), CreateOverwriteContrecordRecord(), createPostingTree(), CreateTableSpace(), do_pg_backup_stop(), do_setval(), doPickSplit(), DropTableSpace(), EndPrepare(), ExecuteTruncateGuts(), fill_seq_fork_with_data(), GenericXLogFinish(), ginDeletePage(), ginHeapTupleFastInsert(), ginPlaceToPage(), ginUpdateStats(), ginVacuumPostingTreeLeaf(), gistXLogAssignLSN(), gistXLogDelete(), gistXLogPageDelete(), gistXLogPageReuse(), gistXLogSplit(), gistXLogUpdate(), hashbucketcleanup(), hashbulkdelete(), heap_abort_speculative(), heap_delete(), heap_finish_speculative(), heap_inplace_update(), heap_insert(), heap_lock_tuple(), heap_lock_updated_tuple_rec(), heap_multi_insert(), heap_update(), log_heap_new_cid(), log_heap_prune_and_freeze(), log_heap_update(), log_heap_visible(), log_newpage(), log_newpage_range(), log_newpages(), log_smgrcreate(), log_split_page(), LogAccessExclusiveLocks(), LogCurrentRunningXacts(), logical_heap_rewrite_flush_mappings(), LogLogicalInvalidations(), LogLogicalMessage(), LogStandbyInvalidations(), movedb(), moveLeafs(), MultiXactIdCreateFromMembers(), nextval_internal(), pg_truncate_visibility_map(), RelationTruncate(), remove_dbtablespaces(), replorigin_advance(), replorigin_state_clear(), RequestXLogSwitch(), revmap_physical_extend(), shiftList(), spgAddNodeAction(), spgSplitNodeAction(), test_custom_rmgrs_insert_wal_record(), UpdateFullPageWrites(), vacuumLeafPage(), vacuumLeafRoot(), vacuumRedirectAndPlaceholder(), write_relmap_file(), writeListPage(), WriteMTruncateXlogRec(), WriteMZeroPageXlogRec(), WriteTruncateXlogRec(), WriteZeroPageXlogRec(), XactLogAbortRecord(), XactLogCommitRecord(), XLogPutNextOid(), XLogReportParameters(), XLogRestorePoint(), XLogSaveBufferForHint(), and xlogVacuumPage().

◆ XLogCheckBufferNeedsBackup()

bool XLogCheckBufferNeedsBackup ( Buffer  buffer)

Definition at line 1027 of file xloginsert.c.

1028 {
1030  bool doPageWrites;
1031  Page page;
1032 
1034 
1035  page = BufferGetPage(buffer);
1036 
1037  if (doPageWrites && PageGetLSN(page) <= RedoRecPtr)
1038  return true; /* buffer requires backup */
1039 
1040  return false; /* buffer does not need to be backed up */
1041 }
static XLogRecPtr PageGetLSN(Page page)
Definition: bufpage.h:386
void GetFullPageWriteInfo(XLogRecPtr *RedoRecPtr_p, bool *doPageWrites_p)
Definition: xlog.c:6423
static XLogRecPtr RedoRecPtr
Definition: xlog.c:271
static bool doPageWrites
Definition: xlog.c:284

References BufferGetPage(), doPageWrites, GetFullPageWriteInfo(), PageGetLSN(), and RedoRecPtr.

Referenced by heap_page_prune_and_freeze(), and log_heap_update().

◆ XLogCompressBackupBlock()

static bool XLogCompressBackupBlock ( char *  page,
uint16  hole_offset,
uint16  hole_length,
char *  dest,
uint16 dlen 
)
static

Definition at line 944 of file xloginsert.c.

946 {
947  int32 orig_len = BLCKSZ - hole_length;
948  int32 len = -1;
949  int32 extra_bytes = 0;
950  char *source;
951  PGAlignedBlock tmp;
952 
953  if (hole_length != 0)
954  {
955  /* must skip the hole */
956  source = tmp.data;
957  memcpy(source, page, hole_offset);
958  memcpy(source + hole_offset,
959  page + (hole_offset + hole_length),
960  BLCKSZ - (hole_length + hole_offset));
961 
962  /*
963  * Extra data needs to be stored in WAL record for the compressed
964  * version of block image if the hole exists.
965  */
967  }
968  else
969  source = page;
970 
972  {
975  break;
976 
977  case WAL_COMPRESSION_LZ4:
978 #ifdef USE_LZ4
979  len = LZ4_compress_default(source, dest, orig_len,
981  if (len <= 0)
982  len = -1; /* failure */
983 #else
984  elog(ERROR, "LZ4 is not supported by this build");
985 #endif
986  break;
987 
989 #ifdef USE_ZSTD
990  len = ZSTD_compress(dest, COMPRESS_BUFSIZE, source, orig_len,
991  ZSTD_CLEVEL_DEFAULT);
992  if (ZSTD_isError(len))
993  len = -1; /* failure */
994 #else
995  elog(ERROR, "zstd is not supported by this build");
996 #endif
997  break;
998 
1000  Assert(false); /* cannot happen */
1001  break;
1002  /* no default case, so that compiler will warn */
1003  }
1004 
1005  /*
1006  * We recheck the actual size even if compression reports success and see
1007  * if the number of bytes saved by compression is larger than the length
1008  * of extra data needed for the compressed version of block image.
1009  */
1010  if (len >= 0 &&
1011  len + extra_bytes < orig_len)
1012  {
1013  *dlen = (uint16) len; /* successful compression */
1014  return true;
1015  }
1016  return false;
1017 }
unsigned short uint16
Definition: c.h:505
signed int int32
Definition: c.h:494
const void size_t len
const PGLZ_Strategy *const PGLZ_strategy_default
int32 pglz_compress(const char *source, int32 slen, char *dest, const PGLZ_Strategy *strategy)
static rewind_source * source
Definition: pg_rewind.c:89
char data[BLCKSZ]
Definition: c.h:1119
int wal_compression
Definition: xlog.c:122
WalCompression
Definition: xlog.h:81
@ WAL_COMPRESSION_NONE
Definition: xlog.h:82
@ WAL_COMPRESSION_LZ4
Definition: xlog.h:84
@ WAL_COMPRESSION_PGLZ
Definition: xlog.h:83
@ WAL_COMPRESSION_ZSTD
Definition: xlog.h:85
#define COMPRESS_BUFSIZE
Definition: xloginsert.c:62
#define SizeOfXLogRecordBlockCompressHeader
Definition: xlogrecord.h:177

References Assert, COMPRESS_BUFSIZE, PGAlignedBlock::data, generate_unaccent_rules::dest, elog, ERROR, len, pglz_compress(), PGLZ_strategy_default, SizeOfXLogRecordBlockCompressHeader, source, wal_compression, WAL_COMPRESSION_LZ4, WAL_COMPRESSION_NONE, WAL_COMPRESSION_PGLZ, and WAL_COMPRESSION_ZSTD.

Referenced by XLogRecordAssemble().

◆ XLogEnsureRecordSpace()

void XLogEnsureRecordSpace ( int  max_block_id,
int  ndatas 
)

Definition at line 175 of file xloginsert.c.

176 {
177  int nbuffers;
178 
179  /*
180  * This must be called before entering a critical section, because
181  * allocating memory inside a critical section can fail. repalloc() will
182  * check the same, but better to check it here too so that we fail
183  * consistently even if the arrays happen to be large enough already.
184  */
185  Assert(CritSectionCount == 0);
186 
187  /* the minimum values can't be decreased */
188  if (max_block_id < XLR_NORMAL_MAX_BLOCK_ID)
189  max_block_id = XLR_NORMAL_MAX_BLOCK_ID;
190  if (ndatas < XLR_NORMAL_RDATAS)
191  ndatas = XLR_NORMAL_RDATAS;
192 
193  if (max_block_id > XLR_MAX_BLOCK_ID)
194  elog(ERROR, "maximum number of WAL record block references exceeded");
195  nbuffers = max_block_id + 1;
196 
197  if (nbuffers > max_registered_buffers)
198  {
200  repalloc(registered_buffers, sizeof(registered_buffer) * nbuffers);
201 
202  /*
203  * At least the padding bytes in the structs must be zeroed, because
204  * they are included in WAL data, but initialize it all for tidiness.
205  */
207  (nbuffers - max_registered_buffers) * sizeof(registered_buffer));
208  max_registered_buffers = nbuffers;
209  }
210 
211  if (ndatas > max_rdatas)
212  {
213  rdatas = (XLogRecData *) repalloc(rdatas, sizeof(XLogRecData) * ndatas);
214  max_rdatas = ndatas;
215  }
216 }
#define MemSet(start, val, len)
Definition: c.h:1020
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1541

References Assert, CritSectionCount, elog, ERROR, max_rdatas, max_registered_buffers, MemSet, rdatas, registered_buffers, repalloc(), XLR_MAX_BLOCK_ID, XLR_NORMAL_MAX_BLOCK_ID, and XLR_NORMAL_RDATAS.

Referenced by _hash_freeovflpage(), _hash_squeezebucket(), EndPrepare(), gistplacetopage(), log_newpage_range(), log_newpages(), and shiftList().

◆ XLogInsert()

XLogRecPtr XLogInsert ( RmgrId  rmid,
uint8  info 
)

Definition at line 474 of file xloginsert.c.

475 {
476  XLogRecPtr EndPos;
477 
478  /* XLogBeginInsert() must have been called. */
479  if (!begininsert_called)
480  elog(ERROR, "XLogBeginInsert was not called");
481 
482  /*
483  * The caller can set rmgr bits, XLR_SPECIAL_REL_UPDATE and
484  * XLR_CHECK_CONSISTENCY; the rest are reserved for use by me.
485  */
486  if ((info & ~(XLR_RMGR_INFO_MASK |
488  XLR_CHECK_CONSISTENCY)) != 0)
489  elog(PANIC, "invalid xlog info mask %02X", info);
490 
491  TRACE_POSTGRESQL_WAL_INSERT(rmid, info);
492 
493  /*
494  * In bootstrap mode, we don't actually log anything but XLOG resources;
495  * return a phony record pointer.
496  */
497  if (IsBootstrapProcessingMode() && rmid != RM_XLOG_ID)
498  {
500  EndPos = SizeOfXLogLongPHD; /* start of 1st chkpt record */
501  return EndPos;
502  }
503 
504  do
505  {
507  bool doPageWrites;
508  bool topxid_included = false;
509  XLogRecPtr fpw_lsn;
510  XLogRecData *rdt;
511  int num_fpi = 0;
512 
513  /*
514  * Get values needed to decide whether to do full-page writes. Since
515  * we don't yet have an insertion lock, these could change under us,
516  * but XLogInsertRecord will recheck them once it has a lock.
517  */
519 
520  rdt = XLogRecordAssemble(rmid, info, RedoRecPtr, doPageWrites,
521  &fpw_lsn, &num_fpi, &topxid_included);
522 
523  EndPos = XLogInsertRecord(rdt, fpw_lsn, curinsert_flags, num_fpi,
524  topxid_included);
525  } while (EndPos == InvalidXLogRecPtr);
526 
528 
529  return EndPos;
530 }
#define PANIC
Definition: elog.h:42
#define IsBootstrapProcessingMode()
Definition: miscadmin.h:454
XLogRecPtr XLogInsertRecord(XLogRecData *rdata, XLogRecPtr fpw_lsn, uint8 flags, int num_fpi, bool topxid_included)
Definition: xlog.c:741
#define SizeOfXLogLongPHD
Definition: xlog_internal.h:69
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
static uint8 curinsert_flags
Definition: xloginsert.c:103
void XLogResetInsertion(void)
Definition: xloginsert.c:222
static XLogRecData * XLogRecordAssemble(RmgrId rmid, uint8 info, XLogRecPtr RedoRecPtr, bool doPageWrites, XLogRecPtr *fpw_lsn, int *num_fpi, bool *topxid_included)
Definition: xloginsert.c:548
#define XLR_RMGR_INFO_MASK
Definition: xlogrecord.h:63
#define XLR_SPECIAL_REL_UPDATE
Definition: xlogrecord.h:82
#define XLR_CHECK_CONSISTENCY
Definition: xlogrecord.h:91

References begininsert_called, curinsert_flags, doPageWrites, elog, ERROR, GetFullPageWriteInfo(), InvalidXLogRecPtr, IsBootstrapProcessingMode, PANIC, RedoRecPtr, SizeOfXLogLongPHD, XLogInsertRecord(), XLogRecordAssemble(), XLogResetInsertion(), XLR_CHECK_CONSISTENCY, XLR_RMGR_INFO_MASK, and XLR_SPECIAL_REL_UPDATE.

Referenced by _bt_allocbuf(), _bt_dedup_pass(), _bt_delitems_delete(), _bt_delitems_vacuum(), _bt_getroot(), _bt_insertonpg(), _bt_mark_page_halfdead(), _bt_newlevel(), _bt_set_cleanup_info(), _bt_split(), _bt_unlink_halfdead_page(), _hash_addovflpage(), _hash_doinsert(), _hash_expandtable(), _hash_freeovflpage(), _hash_init(), _hash_splitbucket(), _hash_squeezebucket(), _hash_vacuum_one_page(), addLeafTuple(), AssignTransactionId(), brin_doinsert(), brin_doupdate(), brinbuild(), brinRevmapDesummarizeRange(), CreateCheckPoint(), CreateDatabaseUsingFileCopy(), CreateDirAndVersionFile(), CreateEndOfRecoveryRecord(), CreateOverwriteContrecordRecord(), createPostingTree(), CreateTableSpace(), do_pg_backup_stop(), do_setval(), doPickSplit(), DropTableSpace(), EndPrepare(), ExecuteTruncateGuts(), fill_seq_fork_with_data(), GenericXLogFinish(), ginDeletePage(), ginHeapTupleFastInsert(), ginPlaceToPage(), ginUpdateStats(), ginVacuumPostingTreeLeaf(), gistXLogAssignLSN(), gistXLogDelete(), gistXLogPageDelete(), gistXLogPageReuse(), gistXLogSplit(), gistXLogUpdate(), hashbucketcleanup(), hashbulkdelete(), heap_abort_speculative(), heap_delete(), heap_finish_speculative(), heap_inplace_update(), heap_insert(), heap_lock_tuple(), heap_lock_updated_tuple_rec(), heap_multi_insert(), heap_update(), log_heap_new_cid(), log_heap_prune_and_freeze(), log_heap_update(), log_heap_visible(), log_newpage(), log_newpage_range(), log_newpages(), log_smgrcreate(), log_split_page(), LogAccessExclusiveLocks(), LogCurrentRunningXacts(), logical_heap_rewrite_flush_mappings(), LogLogicalInvalidations(), LogLogicalMessage(), LogStandbyInvalidations(), movedb(), moveLeafs(), MultiXactIdCreateFromMembers(), nextval_internal(), pg_truncate_visibility_map(), RelationTruncate(), remove_dbtablespaces(), replorigin_advance(), replorigin_state_clear(), RequestXLogSwitch(), revmap_physical_extend(), shiftList(), spgAddNodeAction(), spgSplitNodeAction(), test_custom_rmgrs_insert_wal_record(), UpdateFullPageWrites(), vacuumLeafPage(), vacuumLeafRoot(), vacuumRedirectAndPlaceholder(), write_relmap_file(), writeListPage(), WriteMTruncateXlogRec(), WriteMZeroPageXlogRec(), WriteTruncateXlogRec(), WriteZeroPageXlogRec(), XactLogAbortRecord(), XactLogCommitRecord(), XLogPutNextOid(), XLogReportParameters(), XLogRestorePoint(), XLogSaveBufferForHint(), and xlogVacuumPage().

◆ XLogRecordAssemble()

static XLogRecData * XLogRecordAssemble ( RmgrId  rmid,
uint8  info,
XLogRecPtr  RedoRecPtr,
bool  doPageWrites,
XLogRecPtr fpw_lsn,
int *  num_fpi,
bool topxid_included 
)
static

Definition at line 548 of file xloginsert.c.

551 {
552  XLogRecData *rdt;
553  uint64 total_len = 0;
554  int block_id;
555  pg_crc32c rdata_crc;
556  registered_buffer *prev_regbuf = NULL;
557  XLogRecData *rdt_datas_last;
558  XLogRecord *rechdr;
559  char *scratch = hdr_scratch;
560 
561  /*
562  * Note: this function can be called multiple times for the same record.
563  * All the modifications we do to the rdata chains below must handle that.
564  */
565 
566  /* The record begins with the fixed-size header */
567  rechdr = (XLogRecord *) scratch;
568  scratch += SizeOfXLogRecord;
569 
570  hdr_rdt.next = NULL;
571  rdt_datas_last = &hdr_rdt;
573 
574  /*
575  * Enforce consistency checks for this record if user is looking for it.
576  * Do this before at the beginning of this routine to give the possibility
577  * for callers of XLogInsert() to pass XLR_CHECK_CONSISTENCY directly for
578  * a record.
579  */
580  if (wal_consistency_checking[rmid])
581  info |= XLR_CHECK_CONSISTENCY;
582 
583  /*
584  * Make an rdata chain containing all the data portions of all block
585  * references. This includes the data for full-page images. Also append
586  * the headers for the block references in the scratch buffer.
587  */
588  *fpw_lsn = InvalidXLogRecPtr;
589  for (block_id = 0; block_id < max_registered_block_id; block_id++)
590  {
591  registered_buffer *regbuf = &registered_buffers[block_id];
592  bool needs_backup;
593  bool needs_data;
596  XLogRecordBlockCompressHeader cbimg = {0};
597  bool samerel;
598  bool is_compressed = false;
599  bool include_image;
600 
601  if (!regbuf->in_use)
602  continue;
603 
604  /* Determine if this block needs to be backed up */
605  if (regbuf->flags & REGBUF_FORCE_IMAGE)
606  needs_backup = true;
607  else if (regbuf->flags & REGBUF_NO_IMAGE)
608  needs_backup = false;
609  else if (!doPageWrites)
610  needs_backup = false;
611  else
612  {
613  /*
614  * We assume page LSN is first data on *every* page that can be
615  * passed to XLogInsert, whether it has the standard page layout
616  * or not.
617  */
618  XLogRecPtr page_lsn = PageGetLSN(regbuf->page);
619 
620  needs_backup = (page_lsn <= RedoRecPtr);
621  if (!needs_backup)
622  {
623  if (*fpw_lsn == InvalidXLogRecPtr || page_lsn < *fpw_lsn)
624  *fpw_lsn = page_lsn;
625  }
626  }
627 
628  /* Determine if the buffer data needs to included */
629  if (regbuf->rdata_len == 0)
630  needs_data = false;
631  else if ((regbuf->flags & REGBUF_KEEP_DATA) != 0)
632  needs_data = true;
633  else
634  needs_data = !needs_backup;
635 
636  bkpb.id = block_id;
637  bkpb.fork_flags = regbuf->forkno;
638  bkpb.data_length = 0;
639 
640  if ((regbuf->flags & REGBUF_WILL_INIT) == REGBUF_WILL_INIT)
642 
643  /*
644  * If needs_backup is true or WAL checking is enabled for current
645  * resource manager, log a full-page write for the current block.
646  */
647  include_image = needs_backup || (info & XLR_CHECK_CONSISTENCY) != 0;
648 
649  if (include_image)
650  {
651  Page page = regbuf->page;
652  uint16 compressed_len = 0;
653 
654  /*
655  * The page needs to be backed up, so calculate its hole length
656  * and offset.
657  */
658  if (regbuf->flags & REGBUF_STANDARD)
659  {
660  /* Assume we can omit data between pd_lower and pd_upper */
661  uint16 lower = ((PageHeader) page)->pd_lower;
662  uint16 upper = ((PageHeader) page)->pd_upper;
663 
664  if (lower >= SizeOfPageHeaderData &&
665  upper > lower &&
666  upper <= BLCKSZ)
667  {
668  bimg.hole_offset = lower;
669  cbimg.hole_length = upper - lower;
670  }
671  else
672  {
673  /* No "hole" to remove */
674  bimg.hole_offset = 0;
675  cbimg.hole_length = 0;
676  }
677  }
678  else
679  {
680  /* Not a standard page header, don't try to eliminate "hole" */
681  bimg.hole_offset = 0;
682  cbimg.hole_length = 0;
683  }
684 
685  /*
686  * Try to compress a block image if wal_compression is enabled
687  */
689  {
690  is_compressed =
692  cbimg.hole_length,
693  regbuf->compressed_page,
694  &compressed_len);
695  }
696 
697  /*
698  * Fill in the remaining fields in the XLogRecordBlockHeader
699  * struct
700  */
702 
703  /* Report a full page image constructed for the WAL record */
704  *num_fpi += 1;
705 
706  /*
707  * Construct XLogRecData entries for the page content.
708  */
709  rdt_datas_last->next = &regbuf->bkp_rdatas[0];
710  rdt_datas_last = rdt_datas_last->next;
711 
712  bimg.bimg_info = (cbimg.hole_length == 0) ? 0 : BKPIMAGE_HAS_HOLE;
713 
714  /*
715  * If WAL consistency checking is enabled for the resource manager
716  * of this WAL record, a full-page image is included in the record
717  * for the block modified. During redo, the full-page is replayed
718  * only if BKPIMAGE_APPLY is set.
719  */
720  if (needs_backup)
721  bimg.bimg_info |= BKPIMAGE_APPLY;
722 
723  if (is_compressed)
724  {
725  /* The current compression is stored in the WAL record */
726  bimg.length = compressed_len;
727 
728  /* Set the compression method used for this block */
730  {
733  break;
734 
735  case WAL_COMPRESSION_LZ4:
736 #ifdef USE_LZ4
738 #else
739  elog(ERROR, "LZ4 is not supported by this build");
740 #endif
741  break;
742 
744 #ifdef USE_ZSTD
746 #else
747  elog(ERROR, "zstd is not supported by this build");
748 #endif
749  break;
750 
752  Assert(false); /* cannot happen */
753  break;
754  /* no default case, so that compiler will warn */
755  }
756 
757  rdt_datas_last->data = regbuf->compressed_page;
758  rdt_datas_last->len = compressed_len;
759  }
760  else
761  {
762  bimg.length = BLCKSZ - cbimg.hole_length;
763 
764  if (cbimg.hole_length == 0)
765  {
766  rdt_datas_last->data = page;
767  rdt_datas_last->len = BLCKSZ;
768  }
769  else
770  {
771  /* must skip the hole */
772  rdt_datas_last->data = page;
773  rdt_datas_last->len = bimg.hole_offset;
774 
775  rdt_datas_last->next = &regbuf->bkp_rdatas[1];
776  rdt_datas_last = rdt_datas_last->next;
777 
778  rdt_datas_last->data =
779  page + (bimg.hole_offset + cbimg.hole_length);
780  rdt_datas_last->len =
781  BLCKSZ - (bimg.hole_offset + cbimg.hole_length);
782  }
783  }
784 
785  total_len += bimg.length;
786  }
787 
788  if (needs_data)
789  {
790  /*
791  * When copying to XLogRecordBlockHeader, the length is narrowed
792  * to an uint16. Double-check that it is still correct.
793  */
794  Assert(regbuf->rdata_len <= UINT16_MAX);
795 
796  /*
797  * Link the caller-supplied rdata chain for this buffer to the
798  * overall list.
799  */
801  bkpb.data_length = (uint16) regbuf->rdata_len;
802  total_len += regbuf->rdata_len;
803 
804  rdt_datas_last->next = regbuf->rdata_head;
805  rdt_datas_last = regbuf->rdata_tail;
806  }
807 
808  if (prev_regbuf && RelFileLocatorEquals(regbuf->rlocator, prev_regbuf->rlocator))
809  {
810  samerel = true;
812  }
813  else
814  samerel = false;
815  prev_regbuf = regbuf;
816 
817  /* Ok, copy the header to the scratch buffer */
818  memcpy(scratch, &bkpb, SizeOfXLogRecordBlockHeader);
819  scratch += SizeOfXLogRecordBlockHeader;
820  if (include_image)
821  {
822  memcpy(scratch, &bimg, SizeOfXLogRecordBlockImageHeader);
824  if (cbimg.hole_length != 0 && is_compressed)
825  {
826  memcpy(scratch, &cbimg,
829  }
830  }
831  if (!samerel)
832  {
833  memcpy(scratch, &regbuf->rlocator, sizeof(RelFileLocator));
834  scratch += sizeof(RelFileLocator);
835  }
836  memcpy(scratch, &regbuf->block, sizeof(BlockNumber));
837  scratch += sizeof(BlockNumber);
838  }
839 
840  /* followed by the record's origin, if any */
843  {
844  *(scratch++) = (char) XLR_BLOCK_ID_ORIGIN;
845  memcpy(scratch, &replorigin_session_origin, sizeof(replorigin_session_origin));
846  scratch += sizeof(replorigin_session_origin);
847  }
848 
849  /* followed by toplevel XID, if not already included in previous record */
851  {
853 
854  /* Set the flag that the top xid is included in the WAL */
855  *topxid_included = true;
856 
857  *(scratch++) = (char) XLR_BLOCK_ID_TOPLEVEL_XID;
858  memcpy(scratch, &xid, sizeof(TransactionId));
859  scratch += sizeof(TransactionId);
860  }
861 
862  /* followed by main data, if any */
863  if (mainrdata_len > 0)
864  {
865  if (mainrdata_len > 255)
866  {
867  uint32 mainrdata_len_4b;
868 
870  ereport(ERROR,
871  (errmsg_internal("too much WAL data"),
872  errdetail_internal("Main data length is %llu bytes for a maximum of %u bytes.",
873  (unsigned long long) mainrdata_len,
874  PG_UINT32_MAX)));
875 
876  mainrdata_len_4b = (uint32) mainrdata_len;
877  *(scratch++) = (char) XLR_BLOCK_ID_DATA_LONG;
878  memcpy(scratch, &mainrdata_len_4b, sizeof(uint32));
879  scratch += sizeof(uint32);
880  }
881  else
882  {
883  *(scratch++) = (char) XLR_BLOCK_ID_DATA_SHORT;
884  *(scratch++) = (uint8) mainrdata_len;
885  }
886  rdt_datas_last->next = mainrdata_head;
887  rdt_datas_last = mainrdata_last;
888  total_len += mainrdata_len;
889  }
890  rdt_datas_last->next = NULL;
891 
892  hdr_rdt.len = (scratch - hdr_scratch);
893  total_len += hdr_rdt.len;
894 
895  /*
896  * Calculate CRC of the data
897  *
898  * Note that the record header isn't added into the CRC initially since we
899  * don't know the prev-link yet. Thus, the CRC will represent the CRC of
900  * the whole record in the order: rdata, then backup blocks, then record
901  * header.
902  */
903  INIT_CRC32C(rdata_crc);
905  for (rdt = hdr_rdt.next; rdt != NULL; rdt = rdt->next)
906  COMP_CRC32C(rdata_crc, rdt->data, rdt->len);
907 
908  /*
909  * Ensure that the XLogRecord is not too large.
910  *
911  * XLogReader machinery is only able to handle records up to a certain
912  * size (ignoring machine resource limitations), so make sure that we will
913  * not emit records larger than the sizes advertised to be supported.
914  */
915  if (total_len > XLogRecordMaxSize)
916  ereport(ERROR,
917  (errmsg_internal("oversized WAL record"),
918  errdetail_internal("WAL record would be %llu bytes (of maximum %u bytes); rmid %u flags %u.",
919  (unsigned long long) total_len, XLogRecordMaxSize, rmid, info)));
920 
921  /*
922  * Fill in the fields in the record header. Prev-link is filled in later,
923  * once we know where in the WAL the record will be inserted. The CRC does
924  * not include the record header yet.
925  */
927  rechdr->xl_tot_len = (uint32) total_len;
928  rechdr->xl_info = info;
929  rechdr->xl_rmid = rmid;
930  rechdr->xl_prev = InvalidXLogRecPtr;
931  rechdr->xl_crc = rdata_crc;
932 
933  return &hdr_rdt;
934 }
PageHeaderData * PageHeader
Definition: bufpage.h:173
#define SizeOfPageHeaderData
Definition: bufpage.h:216
unsigned int uint32
Definition: c.h:506
#define PG_UINT32_MAX
Definition: c.h:590
unsigned char uint8
Definition: c.h:504
uint32 TransactionId
Definition: c.h:652
int errmsg_internal(const char *fmt,...)
Definition: elog.c:1157
int errdetail_internal(const char *fmt,...)
Definition: elog.c:1230
#define ereport(elevel,...)
Definition: elog.h:149
Datum lower(PG_FUNCTION_ARGS)
Definition: oracle_compat.c:49
Datum upper(PG_FUNCTION_ARGS)
Definition: oracle_compat.c:80
RepOriginId replorigin_session_origin
Definition: origin.c:155
#define InvalidRepOriginId
Definition: origin.h:33
uint32 pg_crc32c
Definition: pg_crc32c.h:38
#define COMP_CRC32C(crc, data, len)
Definition: pg_crc32c.h:98
#define INIT_CRC32C(crc)
Definition: pg_crc32c.h:41
struct RelFileLocator RelFileLocator
#define RelFileLocatorEquals(locator1, locator2)
struct XLogRecData * next
XLogRecPtr xl_prev
Definition: xlogrecord.h:45
pg_crc32c xl_crc
Definition: xlogrecord.h:49
uint8 xl_info
Definition: xlogrecord.h:46
uint32 xl_tot_len
Definition: xlogrecord.h:43
TransactionId xl_xid
Definition: xlogrecord.h:44
RmgrId xl_rmid
Definition: xlogrecord.h:47
XLogRecData bkp_rdatas[2]
Definition: xloginsert.c:82
char compressed_page[COMPRESS_BUFSIZE]
Definition: xloginsert.c:86
XLogRecData * rdata_tail
Definition: xloginsert.c:79
BlockNumber block
Definition: xloginsert.c:74
XLogRecData * rdata_head
Definition: xloginsert.c:77
ForkNumber forkno
Definition: xloginsert.c:73
RelFileLocator rlocator
Definition: xloginsert.c:72
TransactionId GetTopTransactionIdIfAny(void)
Definition: xact.c:439
TransactionId GetCurrentTransactionIdIfAny(void)
Definition: xact.c:469
bool IsSubxactTopXidLogPending(void)
Definition: xact.c:557
bool * wal_consistency_checking
Definition: xlog.c:124
#define XLOG_INCLUDE_ORIGIN
Definition: xlog.h:154
static XLogRecData hdr_rdt
Definition: xloginsert.c:113
static bool XLogCompressBackupBlock(char *page, uint16 hole_offset, uint16 hole_length, char *dest, uint16 *dlen)
Definition: xloginsert.c:944
#define REGBUF_NO_IMAGE
Definition: xloginsert.h:32
#define REGBUF_KEEP_DATA
Definition: xloginsert.h:35
#define REGBUF_WILL_INIT
Definition: xloginsert.h:33
#define SizeOfXLogRecordBlockImageHeader
Definition: xlogrecord.h:153
#define BKPIMAGE_COMPRESS_ZSTD
Definition: xlogrecord.h:162
#define BKPBLOCK_HAS_DATA
Definition: xlogrecord.h:198
#define BKPIMAGE_APPLY
Definition: xlogrecord.h:158
#define BKPIMAGE_HAS_HOLE
Definition: xlogrecord.h:157
#define XLR_BLOCK_ID_DATA_LONG
Definition: xlogrecord.h:242
#define BKPBLOCK_WILL_INIT
Definition: xlogrecord.h:199
#define BKPIMAGE_COMPRESS_LZ4
Definition: xlogrecord.h:161
#define XLR_BLOCK_ID_TOPLEVEL_XID
Definition: xlogrecord.h:244
#define XLR_BLOCK_ID_DATA_SHORT
Definition: xlogrecord.h:241
#define BKPBLOCK_SAME_REL
Definition: xlogrecord.h:200
#define SizeOfXLogRecordBlockHeader
Definition: xlogrecord.h:115
#define BKPIMAGE_COMPRESS_PGLZ
Definition: xlogrecord.h:160
#define XLR_BLOCK_ID_ORIGIN
Definition: xlogrecord.h:243
#define BKPBLOCK_HAS_IMAGE
Definition: xlogrecord.h:197

References Assert, XLogRecordBlockImageHeader::bimg_info, registered_buffer::bkp_rdatas, BKPBLOCK_HAS_DATA, BKPBLOCK_HAS_IMAGE, BKPBLOCK_SAME_REL, BKPBLOCK_WILL_INIT, BKPIMAGE_APPLY, BKPIMAGE_COMPRESS_LZ4, BKPIMAGE_COMPRESS_PGLZ, BKPIMAGE_COMPRESS_ZSTD, BKPIMAGE_HAS_HOLE, registered_buffer::block, COMP_CRC32C, registered_buffer::compressed_page, curinsert_flags, XLogRecData::data, XLogRecordBlockHeader::data_length, doPageWrites, elog, ereport, errdetail_internal(), errmsg_internal(), ERROR, registered_buffer::flags, XLogRecordBlockHeader::fork_flags, registered_buffer::forkno, GetCurrentTransactionIdIfAny(), GetTopTransactionIdIfAny(), hdr_rdt, hdr_scratch, XLogRecordBlockCompressHeader::hole_length, XLogRecordBlockImageHeader::hole_offset, XLogRecordBlockHeader::id, registered_buffer::in_use, INIT_CRC32C, InvalidRepOriginId, InvalidXLogRecPtr, IsSubxactTopXidLogPending(), XLogRecData::len, XLogRecordBlockImageHeader::length, lower(), mainrdata_head, mainrdata_last, mainrdata_len, max_registered_block_id, XLogRecData::next, registered_buffer::page, PageGetLSN(), PG_UINT32_MAX, registered_buffer::rdata_head, registered_buffer::rdata_len, registered_buffer::rdata_tail, RedoRecPtr, REGBUF_FORCE_IMAGE, REGBUF_KEEP_DATA, REGBUF_NO_IMAGE, REGBUF_STANDARD, REGBUF_WILL_INIT, registered_buffers, RelFileLocatorEquals, replorigin_session_origin, registered_buffer::rlocator, SizeOfPageHeaderData, SizeOfXLogRecord, SizeOfXLogRecordBlockCompressHeader, SizeOfXLogRecordBlockHeader, SizeOfXLogRecordBlockImageHeader, upper(), wal_compression, WAL_COMPRESSION_LZ4, WAL_COMPRESSION_NONE, WAL_COMPRESSION_PGLZ, WAL_COMPRESSION_ZSTD, wal_consistency_checking, XLogRecord::xl_crc, XLogRecord::xl_info, XLogRecord::xl_prev, XLogRecord::xl_rmid, XLogRecord::xl_tot_len, XLogRecord::xl_xid, XLOG_INCLUDE_ORIGIN, XLogCompressBackupBlock(), XLogRecordMaxSize, XLR_BLOCK_ID_DATA_LONG, XLR_BLOCK_ID_DATA_SHORT, XLR_BLOCK_ID_ORIGIN, XLR_BLOCK_ID_TOPLEVEL_XID, and XLR_CHECK_CONSISTENCY.

Referenced by XLogInsert().

◆ XLogRegisterBlock()

void XLogRegisterBlock ( uint8  block_id,
RelFileLocator rlocator,
ForkNumber  forknum,
BlockNumber  blknum,
Page  page,
uint8  flags 
)

Definition at line 309 of file xloginsert.c.

311 {
312  registered_buffer *regbuf;
313 
315 
316  if (block_id >= max_registered_block_id)
317  max_registered_block_id = block_id + 1;
318 
319  if (block_id >= max_registered_buffers)
320  elog(ERROR, "too many registered buffers");
321 
322  regbuf = &registered_buffers[block_id];
323 
324  regbuf->rlocator = *rlocator;
325  regbuf->forkno = forknum;
326  regbuf->block = blknum;
327  regbuf->page = page;
328  regbuf->flags = flags;
329  regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
330  regbuf->rdata_len = 0;
331 
332  /*
333  * Check that this page hasn't already been registered with some other
334  * block_id.
335  */
336 #ifdef USE_ASSERT_CHECKING
337  {
338  int i;
339 
340  for (i = 0; i < max_registered_block_id; i++)
341  {
342  registered_buffer *regbuf_old = &registered_buffers[i];
343 
344  if (i == block_id || !regbuf_old->in_use)
345  continue;
346 
347  Assert(!RelFileLocatorEquals(regbuf_old->rlocator, regbuf->rlocator) ||
348  regbuf_old->forkno != regbuf->forkno ||
349  regbuf_old->block != regbuf->block);
350  }
351  }
352 #endif
353 
354  regbuf->in_use = true;
355 }
for(;;)

References Assert, begininsert_called, registered_buffer::block, elog, ERROR, registered_buffer::flags, for(), registered_buffer::forkno, i, registered_buffer::in_use, max_registered_block_id, max_registered_buffers, registered_buffer::page, registered_buffer::rdata_head, registered_buffer::rdata_len, registered_buffer::rdata_tail, registered_buffers, RelFileLocatorEquals, and registered_buffer::rlocator.

Referenced by log_newpage(), log_newpages(), and XLogSaveBufferForHint().

◆ XLogRegisterBufData()

void XLogRegisterBufData ( uint8  block_id,
char *  data,
uint32  len 
)

Definition at line 405 of file xloginsert.c.

406 {
407  registered_buffer *regbuf;
408  XLogRecData *rdata;
409 
411 
412  /* find the registered buffer struct */
413  regbuf = &registered_buffers[block_id];
414  if (!regbuf->in_use)
415  elog(ERROR, "no block with id %d registered with WAL insertion",
416  block_id);
417 
418  /*
419  * Check against max_rdatas and ensure we do not register more data per
420  * buffer than can be handled by the physical data format; i.e. that
421  * regbuf->rdata_len does not grow beyond what
422  * XLogRecordBlockHeader->data_length can hold.
423  */
424  if (num_rdatas >= max_rdatas)
425  ereport(ERROR,
426  (errmsg_internal("too much WAL data"),
427  errdetail_internal("%d out of %d data segments are already in use.",
429  if (regbuf->rdata_len + len > UINT16_MAX || len > UINT16_MAX)
430  ereport(ERROR,
431  (errmsg_internal("too much WAL data"),
432  errdetail_internal("Registering more than maximum %u bytes allowed to block %u: current %u bytes, adding %u bytes.",
433  UINT16_MAX, block_id, regbuf->rdata_len, len)));
434 
435  rdata = &rdatas[num_rdatas++];
436 
437  rdata->data = data;
438  rdata->len = len;
439 
440  regbuf->rdata_tail->next = rdata;
441  regbuf->rdata_tail = rdata;
442  regbuf->rdata_len += len;
443 }
const void * data
static int num_rdatas
Definition: xloginsert.c:129

References Assert, begininsert_called, XLogRecData::data, data, elog, ereport, errdetail_internal(), errmsg_internal(), ERROR, registered_buffer::in_use, XLogRecData::len, len, max_rdatas, XLogRecData::next, num_rdatas, registered_buffer::rdata_len, registered_buffer::rdata_tail, rdatas, and registered_buffers.

Referenced by _bt_dedup_pass(), _bt_delitems_delete(), _bt_delitems_vacuum(), _bt_getroot(), _bt_insertonpg(), _bt_newlevel(), _bt_set_cleanup_info(), _bt_split(), _bt_unlink_halfdead_page(), _hash_addovflpage(), _hash_doinsert(), _hash_expandtable(), _hash_freeovflpage(), _hash_squeezebucket(), brin_doinsert(), brin_doupdate(), dataExecPlaceToPageInternal(), dataExecPlaceToPageLeaf(), entryExecPlaceToPage(), GenericXLogFinish(), ginHeapTupleFastInsert(), ginVacuumPostingTreeLeaf(), gistXLogSplit(), gistXLogUpdate(), hashbucketcleanup(), heap_inplace_update(), heap_insert(), heap_multi_insert(), log_heap_prune_and_freeze(), log_heap_update(), and writeListPage().

◆ XLogRegisterBuffer()

void XLogRegisterBuffer ( uint8  block_id,
Buffer  buffer,
uint8  flags 
)

Definition at line 242 of file xloginsert.c.

243 {
244  registered_buffer *regbuf;
245 
246  /* NO_IMAGE doesn't make sense with FORCE_IMAGE */
247  Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
249 
250  /*
251  * Ordinarily, buffer should be exclusive-locked and marked dirty before
252  * we get here, otherwise we could end up violating one of the rules in
253  * access/transam/README.
254  *
255  * Some callers intentionally register a clean page and never update that
256  * page's LSN; in that case they can pass the flag REGBUF_NO_CHANGE to
257  * bypass these checks.
258  */
259 #ifdef USE_ASSERT_CHECKING
260  if (!(flags & REGBUF_NO_CHANGE))
261  Assert(BufferIsExclusiveLocked(buffer) && BufferIsDirty(buffer));
262 #endif
263 
264  if (block_id >= max_registered_block_id)
265  {
266  if (block_id >= max_registered_buffers)
267  elog(ERROR, "too many registered buffers");
268  max_registered_block_id = block_id + 1;
269  }
270 
271  regbuf = &registered_buffers[block_id];
272 
273  BufferGetTag(buffer, &regbuf->rlocator, &regbuf->forkno, &regbuf->block);
274  regbuf->page = BufferGetPage(buffer);
275  regbuf->flags = flags;
276  regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
277  regbuf->rdata_len = 0;
278 
279  /*
280  * Check that this page hasn't already been registered with some other
281  * block_id.
282  */
283 #ifdef USE_ASSERT_CHECKING
284  {
285  int i;
286 
287  for (i = 0; i < max_registered_block_id; i++)
288  {
289  registered_buffer *regbuf_old = &registered_buffers[i];
290 
291  if (i == block_id || !regbuf_old->in_use)
292  continue;
293 
294  Assert(!RelFileLocatorEquals(regbuf_old->rlocator, regbuf->rlocator) ||
295  regbuf_old->forkno != regbuf->forkno ||
296  regbuf_old->block != regbuf->block);
297  }
298  }
299 #endif
300 
301  regbuf->in_use = true;
302 }
bool BufferIsExclusiveLocked(Buffer buffer)
Definition: bufmgr.c:2482
bool BufferIsDirty(Buffer buffer)
Definition: bufmgr.c:2511
#define REGBUF_NO_CHANGE
Definition: xloginsert.h:36

References Assert, begininsert_called, registered_buffer::block, BufferGetPage(), BufferGetTag(), BufferIsDirty(), BufferIsExclusiveLocked(), elog, ERROR, registered_buffer::flags, for(), registered_buffer::forkno, i, registered_buffer::in_use, max_registered_block_id, max_registered_buffers, registered_buffer::page, registered_buffer::rdata_head, registered_buffer::rdata_len, registered_buffer::rdata_tail, REGBUF_FORCE_IMAGE, REGBUF_NO_CHANGE, REGBUF_NO_IMAGE, registered_buffers, RelFileLocatorEquals, and registered_buffer::rlocator.

Referenced by _bt_dedup_pass(), _bt_delitems_delete(), _bt_delitems_vacuum(), _bt_getroot(), _bt_insertonpg(), _bt_mark_page_halfdead(), _bt_newlevel(), _bt_set_cleanup_info(), _bt_split(), _bt_unlink_halfdead_page(), _hash_addovflpage(), _hash_doinsert(), _hash_expandtable(), _hash_freeovflpage(), _hash_init(), _hash_splitbucket(), _hash_squeezebucket(), _hash_vacuum_one_page(), addLeafTuple(), brin_doinsert(), brin_doupdate(), brinbuild(), brinRevmapDesummarizeRange(), createPostingTree(), dataExecPlaceToPageInternal(), dataExecPlaceToPageLeaf(), do_setval(), doPickSplit(), entryExecPlaceToPage(), fill_seq_fork_with_data(), GenericXLogFinish(), ginDeletePage(), ginHeapTupleFastInsert(), ginPlaceToPage(), ginUpdateStats(), ginVacuumPostingTreeLeaf(), gistXLogDelete(), gistXLogPageDelete(), gistXLogSplit(), gistXLogUpdate(), hashbucketcleanup(), hashbulkdelete(), heap_abort_speculative(), heap_delete(), heap_finish_speculative(), heap_inplace_update(), heap_insert(), heap_lock_tuple(), heap_lock_updated_tuple_rec(), heap_multi_insert(), heap_update(), log_heap_prune_and_freeze(), log_heap_update(), log_heap_visible(), log_newpage_range(), log_split_page(), moveLeafs(), nextval_internal(), revmap_physical_extend(), shiftList(), spgAddNodeAction(), spgSplitNodeAction(), vacuumLeafPage(), vacuumLeafRoot(), vacuumRedirectAndPlaceholder(), writeListPage(), and xlogVacuumPage().

◆ XLogRegisterData()

void XLogRegisterData ( char *  data,
uint32  len 
)

Definition at line 364 of file xloginsert.c.

365 {
366  XLogRecData *rdata;
367 
369 
370  if (num_rdatas >= max_rdatas)
371  ereport(ERROR,
372  (errmsg_internal("too much WAL data"),
373  errdetail_internal("%d out of %d data segments are already in use.",
375  rdata = &rdatas[num_rdatas++];
376 
377  rdata->data = data;
378  rdata->len = len;
379 
380  /*
381  * we use the mainrdata_last pointer to track the end of the chain, so no
382  * need to clear 'next' here.
383  */
384 
385  mainrdata_last->next = rdata;
386  mainrdata_last = rdata;
387 
388  mainrdata_len += len;
389 }

References Assert, begininsert_called, XLogRecData::data, data, ereport, errdetail_internal(), errmsg_internal(), ERROR, XLogRecData::len, len, mainrdata_last, mainrdata_len, max_rdatas, XLogRecData::next, num_rdatas, and rdatas.

Referenced by _bt_allocbuf(), _bt_dedup_pass(), _bt_delitems_delete(), _bt_delitems_vacuum(), _bt_getroot(), _bt_insertonpg(), _bt_mark_page_halfdead(), _bt_newlevel(), _bt_split(), _bt_unlink_halfdead_page(), _hash_addovflpage(), _hash_doinsert(), _hash_expandtable(), _hash_freeovflpage(), _hash_init(), _hash_splitbucket(), _hash_squeezebucket(), _hash_vacuum_one_page(), addLeafTuple(), AssignTransactionId(), brin_doinsert(), brin_doupdate(), brinbuild(), brinRevmapDesummarizeRange(), CreateCheckPoint(), CreateDatabaseUsingFileCopy(), CreateDirAndVersionFile(), CreateEndOfRecoveryRecord(), CreateOverwriteContrecordRecord(), createPostingTree(), CreateTableSpace(), do_pg_backup_stop(), do_setval(), doPickSplit(), DropTableSpace(), EndPrepare(), ExecuteTruncateGuts(), fill_seq_fork_with_data(), ginDeletePage(), ginHeapTupleFastInsert(), ginPlaceToPage(), ginUpdateStats(), gistXLogAssignLSN(), gistXLogDelete(), gistXLogPageDelete(), gistXLogPageReuse(), gistXLogSplit(), gistXLogUpdate(), hashbucketcleanup(), hashbulkdelete(), heap_abort_speculative(), heap_delete(), heap_finish_speculative(), heap_inplace_update(), heap_insert(), heap_lock_tuple(), heap_lock_updated_tuple_rec(), heap_multi_insert(), heap_update(), log_heap_new_cid(), log_heap_prune_and_freeze(), log_heap_update(), log_heap_visible(), log_smgrcreate(), LogAccessExclusiveLocks(), LogCurrentRunningXacts(), logical_heap_rewrite_flush_mappings(), LogLogicalInvalidations(), LogLogicalMessage(), LogStandbyInvalidations(), movedb(), moveLeafs(), MultiXactIdCreateFromMembers(), nextval_internal(), pg_truncate_visibility_map(), RelationTruncate(), remove_dbtablespaces(), replorigin_advance(), replorigin_state_clear(), revmap_physical_extend(), shiftList(), spgAddNodeAction(), spgSplitNodeAction(), test_custom_rmgrs_insert_wal_record(), UpdateFullPageWrites(), vacuumLeafPage(), vacuumLeafRoot(), vacuumRedirectAndPlaceholder(), write_relmap_file(), writeListPage(), WriteMTruncateXlogRec(), WriteMZeroPageXlogRec(), WriteTruncateXlogRec(), WriteZeroPageXlogRec(), XactLogAbortRecord(), XactLogCommitRecord(), XLogPutNextOid(), XLogReportParameters(), and XLogRestorePoint().

◆ XLogResetInsertion()

void XLogResetInsertion ( void  )

Definition at line 222 of file xloginsert.c.

223 {
224  int i;
225 
226  for (i = 0; i < max_registered_block_id; i++)
227  registered_buffers[i].in_use = false;
228 
229  num_rdatas = 0;
231  mainrdata_len = 0;
233  curinsert_flags = 0;
234  begininsert_called = false;
235 }

References begininsert_called, curinsert_flags, i, mainrdata_head, mainrdata_last, mainrdata_len, max_registered_block_id, num_rdatas, and registered_buffers.

Referenced by AbortSubTransaction(), AbortTransaction(), and XLogInsert().

◆ XLogSaveBufferForHint()

XLogRecPtr XLogSaveBufferForHint ( Buffer  buffer,
bool  buffer_std 
)

Definition at line 1065 of file xloginsert.c.

1066 {
1067  XLogRecPtr recptr = InvalidXLogRecPtr;
1068  XLogRecPtr lsn;
1070 
1071  /*
1072  * Ensure no checkpoint can change our view of RedoRecPtr.
1073  */
1075 
1076  /*
1077  * Update RedoRecPtr so that we can make the right decision
1078  */
1080 
1081  /*
1082  * We assume page LSN is first data on *every* page that can be passed to
1083  * XLogInsert, whether it has the standard page layout or not. Since we're
1084  * only holding a share-lock on the page, we must take the buffer header
1085  * lock when we look at the LSN.
1086  */
1087  lsn = BufferGetLSNAtomic(buffer);
1088 
1089  if (lsn <= RedoRecPtr)
1090  {
1091  int flags = 0;
1092  PGAlignedBlock copied_buffer;
1093  char *origdata = (char *) BufferGetBlock(buffer);
1094  RelFileLocator rlocator;
1095  ForkNumber forkno;
1096  BlockNumber blkno;
1097 
1098  /*
1099  * Copy buffer so we don't have to worry about concurrent hint bit or
1100  * lsn updates. We assume pd_lower/upper cannot be changed without an
1101  * exclusive lock, so the contents bkp are not racy.
1102  */
1103  if (buffer_std)
1104  {
1105  /* Assume we can omit data between pd_lower and pd_upper */
1106  Page page = BufferGetPage(buffer);
1107  uint16 lower = ((PageHeader) page)->pd_lower;
1108  uint16 upper = ((PageHeader) page)->pd_upper;
1109 
1110  memcpy(copied_buffer.data, origdata, lower);
1111  memcpy(copied_buffer.data + upper, origdata + upper, BLCKSZ - upper);
1112  }
1113  else
1114  memcpy(copied_buffer.data, origdata, BLCKSZ);
1115 
1116  XLogBeginInsert();
1117 
1118  if (buffer_std)
1119  flags |= REGBUF_STANDARD;
1120 
1121  BufferGetTag(buffer, &rlocator, &forkno, &blkno);
1122  XLogRegisterBlock(0, &rlocator, forkno, blkno, copied_buffer.data, flags);
1123 
1124  recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
1125  }
1126 
1127  return recptr;
1128 }
XLogRecPtr BufferGetLSNAtomic(Buffer buffer)
Definition: bufmgr.c:3997
static Block BufferGetBlock(Buffer buffer)
Definition: bufmgr.h:367
#define XLOG_FPI_FOR_HINT
Definition: pg_control.h:78
#define DELAY_CHKPT_START
Definition: proc.h:114
PGPROC * MyProc
Definition: proc.c:66
int delayChkptFlags
Definition: proc.h:235
XLogRecPtr GetRedoRecPtr(void)
Definition: xlog.c:6393

References Assert, BufferGetBlock(), BufferGetLSNAtomic(), BufferGetPage(), BufferGetTag(), PGAlignedBlock::data, DELAY_CHKPT_START, PGPROC::delayChkptFlags, GetRedoRecPtr(), InvalidXLogRecPtr, lower(), MyProc, RedoRecPtr, REGBUF_STANDARD, upper(), XLOG_FPI_FOR_HINT, XLogBeginInsert(), XLogInsert(), and XLogRegisterBlock().

Referenced by MarkBufferDirtyHint().

◆ XLogSetRecordFlags()

Variable Documentation

◆ begininsert_called

◆ curinsert_flags

uint8 curinsert_flags = 0
static

◆ hdr_rdt

XLogRecData hdr_rdt
static

Definition at line 113 of file xloginsert.c.

Referenced by XLogRecordAssemble().

◆ hdr_scratch

char* hdr_scratch = NULL
static

Definition at line 114 of file xloginsert.c.

Referenced by InitXLogInsert(), and XLogRecordAssemble().

◆ mainrdata_head

XLogRecData* mainrdata_head
static

Definition at line 98 of file xloginsert.c.

Referenced by XLogBeginInsert(), XLogRecordAssemble(), and XLogResetInsertion().

◆ mainrdata_last

XLogRecData* mainrdata_last = (XLogRecData *) &mainrdata_head
static

◆ mainrdata_len

uint64 mainrdata_len
static

◆ max_rdatas

int max_rdatas
static

◆ max_registered_block_id

int max_registered_block_id = 0
static

◆ max_registered_buffers

int max_registered_buffers
static

◆ num_rdatas

int num_rdatas
static

Definition at line 129 of file xloginsert.c.

Referenced by XLogRegisterBufData(), XLogRegisterData(), and XLogResetInsertion().

◆ rdatas

XLogRecData* rdatas
static

◆ registered_buffers

◆ xloginsert_cxt

MemoryContext xloginsert_cxt
static

Definition at line 135 of file xloginsert.c.

Referenced by InitXLogInsert().