PostgreSQL Source Code  git master
fd.h File Reference
#include <dirent.h>
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Macros

#define FILE_POSSIBLY_DELETED(err)   ((err) == ENOENT)
 
#define PG_O_DIRECT   0
 
#define PG_TEMP_FILES_DIR   "pgsql_tmp"
 
#define PG_TEMP_FILE_PREFIX   "pgsql_tmp"
 

Typedefs

typedef enum RecoveryInitSyncMethod RecoveryInitSyncMethod
 
typedef int File
 

Enumerations

enum  RecoveryInitSyncMethod { RECOVERY_INIT_SYNC_METHOD_FSYNC, RECOVERY_INIT_SYNC_METHOD_SYNCFS }
 

Functions

File PathNameOpenFile (const char *fileName, int fileFlags)
 
File PathNameOpenFilePerm (const char *fileName, int fileFlags, mode_t fileMode)
 
File OpenTemporaryFile (bool interXact)
 
void FileClose (File file)
 
int FilePrefetch (File file, off_t offset, int amount, uint32 wait_event_info)
 
int FileRead (File file, char *buffer, int amount, off_t offset, uint32 wait_event_info)
 
int FileWrite (File file, char *buffer, int amount, off_t offset, uint32 wait_event_info)
 
int FileSync (File file, uint32 wait_event_info)
 
off_t FileSize (File file)
 
int FileTruncate (File file, off_t offset, uint32 wait_event_info)
 
void FileWriteback (File file, off_t offset, off_t nbytes, uint32 wait_event_info)
 
char * FilePathName (File file)
 
int FileGetRawDesc (File file)
 
int FileGetRawFlags (File file)
 
mode_t FileGetRawMode (File file)
 
File PathNameCreateTemporaryFile (const char *name, bool error_on_failure)
 
File PathNameOpenTemporaryFile (const char *path, int mode)
 
bool PathNameDeleteTemporaryFile (const char *name, bool error_on_failure)
 
void PathNameCreateTemporaryDir (const char *base, const char *name)
 
void PathNameDeleteTemporaryDir (const char *name)
 
void TempTablespacePath (char *path, Oid tablespace)
 
FILE * AllocateFile (const char *name, const char *mode)
 
int FreeFile (FILE *file)
 
FILE * OpenPipeStream (const char *command, const char *mode)
 
int ClosePipeStream (FILE *file)
 
DIRAllocateDir (const char *dirname)
 
struct direntReadDir (DIR *dir, const char *dirname)
 
struct direntReadDirExtended (DIR *dir, const char *dirname, int elevel)
 
int FreeDir (DIR *dir)
 
int OpenTransientFile (const char *fileName, int fileFlags)
 
int OpenTransientFilePerm (const char *fileName, int fileFlags, mode_t fileMode)
 
int CloseTransientFile (int fd)
 
int BasicOpenFile (const char *fileName, int fileFlags)
 
int BasicOpenFilePerm (const char *fileName, int fileFlags, mode_t fileMode)
 
bool AcquireExternalFD (void)
 
void ReserveExternalFD (void)
 
void ReleaseExternalFD (void)
 
int MakePGDirectory (const char *directoryName)
 
void InitFileAccess (void)
 
void set_max_safe_fds (void)
 
void closeAllVfds (void)
 
void SetTempTablespaces (Oid *tableSpaces, int numSpaces)
 
bool TempTablespacesAreSet (void)
 
int GetTempTablespaces (Oid *tableSpaces, int numSpaces)
 
Oid GetNextTempTableSpace (void)
 
void AtEOXact_Files (bool isCommit)
 
void AtEOSubXact_Files (bool isCommit, SubTransactionId mySubid, SubTransactionId parentSubid)
 
void RemovePgTempFiles (void)
 
void RemovePgTempFilesInDir (const char *tmpdirname, bool missing_ok, bool unlink_all)
 
bool looks_like_temp_rel_name (const char *name)
 
int pg_fsync (int fd)
 
int pg_fsync_no_writethrough (int fd)
 
int pg_fsync_writethrough (int fd)
 
int pg_fdatasync (int fd)
 
void pg_flush_data (int fd, off_t offset, off_t amount)
 
ssize_t pg_pwritev_with_retry (int fd, const struct iovec *iov, int iovcnt, off_t offset)
 
int pg_truncate (const char *path, off_t length)
 
void fsync_fname (const char *fname, bool isdir)
 
int fsync_fname_ext (const char *fname, bool isdir, bool ignore_perm, int elevel)
 
int durable_rename (const char *oldfile, const char *newfile, int loglevel)
 
int durable_unlink (const char *fname, int loglevel)
 
int durable_rename_excl (const char *oldfile, const char *newfile, int loglevel)
 
void SyncDataDirectory (void)
 
int data_sync_elevel (int elevel)
 

Variables

PGDLLIMPORT int max_files_per_process
 
PGDLLIMPORT bool data_sync_retry
 
int recovery_init_sync_method
 
int max_safe_fds
 

Macro Definition Documentation

◆ FILE_POSSIBLY_DELETED

#define FILE_POSSIBLY_DELETED (   err)    ((err) == ENOENT)

Definition at line 77 of file fd.h.

Referenced by _mdfd_getseg(), mdopenfork(), and ProcessSyncRequests().

◆ PG_O_DIRECT

#define PG_O_DIRECT   0

Definition at line 95 of file fd.h.

Referenced by BasicOpenFilePerm(), and get_sync_bit().

◆ PG_TEMP_FILE_PREFIX

#define PG_TEMP_FILE_PREFIX   "pgsql_tmp"

Definition at line 195 of file fd.h.

◆ PG_TEMP_FILES_DIR

#define PG_TEMP_FILES_DIR   "pgsql_tmp"

Definition at line 194 of file fd.h.

Typedef Documentation

◆ File

typedef int File

Definition at line 54 of file fd.h.

◆ RecoveryInitSyncMethod

Enumeration Type Documentation

◆ RecoveryInitSyncMethod

Enumerator
RECOVERY_INIT_SYNC_METHOD_FSYNC 
RECOVERY_INIT_SYNC_METHOD_SYNCFS 

Definition at line 48 of file fd.h.

Function Documentation

◆ AcquireExternalFD()

bool AcquireExternalFD ( void  )

Definition at line 1139 of file fd.c.

References max_safe_fds, numExternalFDs, and ReserveExternalFD().

Referenced by connect_pg_server(), CreateWaitEventSet(), dblink_connect(), and dblink_get_conn().

1140 {
1141  /*
1142  * We don't want more than max_safe_fds / 3 FDs to be consumed for
1143  * "external" FDs.
1144  */
1145  if (numExternalFDs < max_safe_fds / 3)
1146  {
1148  return true;
1149  }
1150  errno = EMFILE;
1151  return false;
1152 }
static int numExternalFDs
Definition: fd.c:265
int max_safe_fds
Definition: fd.c:158
void ReserveExternalFD(void)
Definition: fd.c:1174

◆ AllocateDir()

DIR* AllocateDir ( const char *  dirname)

Definition at line 2678 of file fd.c.

References AllocateDescDir, AllocateDesc::create_subid, AllocateDesc::desc, AllocateDesc::dir, DO_DB, elog, ereport, errcode(), errmsg(), ERROR, GetCurrentSubTransactionId(), AllocateDesc::kind, LOG, maxAllocatedDescs, numAllocatedDescs, opendir(), ReleaseLruFile(), ReleaseLruFiles(), and reserveAllocatedDesc().

Referenced by calculate_database_size(), calculate_tablespace_size(), CheckPointLogicalRewriteHeap(), CheckPointSnapBuild(), CleanupBackupHistory(), copydir(), db_dir_size(), DeleteAllExportedSnapshotFiles(), destroy_tablespace_directories(), directory_is_empty(), do_pg_start_backup(), dsm_cleanup_for_mmap(), extension_file_exists(), get_ext_ver_list(), getInstallationPaths(), movedb(), ParseTzFile(), perform_base_backup(), pg_available_extension_versions(), pg_available_extensions(), pg_logdir_ls_internal(), pg_ls_dir(), pg_ls_dir_files(), pg_tablespace_databases(), pg_tzenumerate_next(), pg_tzenumerate_start(), pgarch_readyXlog(), pgstat_reset_remove_files(), RelationCacheInitFileRemove(), RelationCacheInitFileRemoveInDir(), RemoveNonParentXlogFiles(), RemoveOldXlogFiles(), RemovePgTempFiles(), RemovePgTempFilesInDir(), RemovePgTempRelationFiles(), RemovePgTempRelationFilesInDbspace(), RemoveTempXlogFiles(), ReorderBufferCleanupSerializedTXNs(), ResetUnloggedRelations(), ResetUnloggedRelationsInDbspaceDir(), ResetUnloggedRelationsInTablespaceDir(), restoreTwoPhaseData(), scan_directory_ci(), sendDir(), SlruScanDirectory(), StartupReorderBuffer(), StartupReplicationSlots(), SyncDataDirectory(), UpdateLogicalMappings(), and walkdir().

2679 {
2680  DIR *dir;
2681 
2682  DO_DB(elog(LOG, "AllocateDir: Allocated %d (%s)",
2683  numAllocatedDescs, dirname));
2684 
2685  /* Can we allocate another non-virtual FD? */
2686  if (!reserveAllocatedDesc())
2687  ereport(ERROR,
2688  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2689  errmsg("exceeded maxAllocatedDescs (%d) while trying to open directory \"%s\"",
2690  maxAllocatedDescs, dirname)));
2691 
2692  /* Close excess kernel FDs. */
2693  ReleaseLruFiles();
2694 
2695 TryAgain:
2696  if ((dir = opendir(dirname)) != NULL)
2697  {
2699 
2700  desc->kind = AllocateDescDir;
2701  desc->desc.dir = dir;
2704  return desc->desc.dir;
2705  }
2706 
2707  if (errno == EMFILE || errno == ENFILE)
2708  {
2709  int save_errno = errno;
2710 
2711  ereport(LOG,
2712  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2713  errmsg("out of file descriptors: %m; release and retry")));
2714  errno = 0;
2715  if (ReleaseLruFile())
2716  goto TryAgain;
2717  errno = save_errno;
2718  }
2719 
2720  return NULL;
2721 }
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
DIR * dir
Definition: fd.c:253
#define DO_DB(A)
Definition: fd.c:176
int errcode(int sqlerrcode)
Definition: elog.c:698
static bool reserveAllocatedDesc(void)
Definition: fd.c:2342
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static bool ReleaseLruFile(void)
Definition: fd.c:1335
Definition: dirent.c:25
#define ERROR
Definition: elog.h:46
DIR * opendir(const char *)
Definition: dirent.c:33
static void ReleaseLruFiles(void)
Definition: fd.c:1357
#define ereport(elevel,...)
Definition: elog.h:157
SubTransactionId GetCurrentSubTransactionId(void)
Definition: xact.c:723
SubTransactionId create_subid
Definition: fd.c:249
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
static int maxAllocatedDescs
Definition: fd.c:259
static int numAllocatedDescs
Definition: fd.c:258

◆ AllocateFile()

FILE* AllocateFile ( const char *  name,
const char *  mode 
)

Definition at line 2417 of file fd.c.

References AllocateDescFile, AllocateDesc::create_subid, AllocateDesc::desc, DO_DB, elog, ereport, errcode(), errmsg(), ERROR, AllocateDesc::file, GetCurrentSubTransactionId(), AllocateDesc::kind, LOG, maxAllocatedDescs, numAllocatedDescs, ReleaseLruFile(), ReleaseLruFiles(), and reserveAllocatedDesc().

Referenced by _ShowOption(), AlterSystemSetConfigFile(), apw_dump_now(), apw_load_buffers(), BackendRun(), BeginCopyFrom(), BeginCopyTo(), checkControlFile(), do_pg_start_backup(), do_pg_stop_backup(), entry_reset(), existsTimeLineHistory(), ExportSnapshot(), fill_hba_view(), gc_qtexts(), ImportSnapshot(), load_dh_file(), load_hba(), load_ident(), load_relcache_init_file(), parse_extension_control_file(), ParseTzFile(), pg_backup_start_time(), pg_current_logfile(), pg_file_write_internal(), pg_promote(), PGSharedMemoryAttach(), pgss_shmem_shutdown(), pgss_shmem_startup(), pgstat_read_db_statsfile(), pgstat_read_db_statsfile_timestamp(), pgstat_read_statsfiles(), pgstat_write_db_statsfile(), pgstat_write_statsfiles(), PostmasterMarkPIDForWorkerNotify(), read_backup_label(), read_binary_file(), read_tablespace_map(), read_whole_file(), readTimeLineHistory(), tokenize_inc_file(), tsearch_readline_begin(), ValidatePgVersion(), write_relcache_init_file(), XLogArchiveForceDone(), and XLogArchiveNotify().

2418 {
2419  FILE *file;
2420 
2421  DO_DB(elog(LOG, "AllocateFile: Allocated %d (%s)",
2423 
2424  /* Can we allocate another non-virtual FD? */
2425  if (!reserveAllocatedDesc())
2426  ereport(ERROR,
2427  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2428  errmsg("exceeded maxAllocatedDescs (%d) while trying to open file \"%s\"",
2429  maxAllocatedDescs, name)));
2430 
2431  /* Close excess kernel FDs. */
2432  ReleaseLruFiles();
2433 
2434 TryAgain:
2435  if ((file = fopen(name, mode)) != NULL)
2436  {
2438 
2439  desc->kind = AllocateDescFile;
2440  desc->desc.file = file;
2443  return desc->desc.file;
2444  }
2445 
2446  if (errno == EMFILE || errno == ENFILE)
2447  {
2448  int save_errno = errno;
2449 
2450  ereport(LOG,
2451  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2452  errmsg("out of file descriptors: %m; release and retry")));
2453  errno = 0;
2454  if (ReleaseLruFile())
2455  goto TryAgain;
2456  errno = save_errno;
2457  }
2458 
2459  return NULL;
2460 }
static PgChecksumMode mode
Definition: pg_checksums.c:63
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
#define DO_DB(A)
Definition: fd.c:176
int errcode(int sqlerrcode)
Definition: elog.c:698
static bool reserveAllocatedDesc(void)
Definition: fd.c:2342
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static bool ReleaseLruFile(void)
Definition: fd.c:1335
#define ERROR
Definition: elog.h:46
static void ReleaseLruFiles(void)
Definition: fd.c:1357
FILE * file
Definition: fd.c:252
#define ereport(elevel,...)
Definition: elog.h:157
SubTransactionId GetCurrentSubTransactionId(void)
Definition: xact.c:723
SubTransactionId create_subid
Definition: fd.c:249
const char * name
Definition: encode.c:515
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
static int maxAllocatedDescs
Definition: fd.c:259
static int numAllocatedDescs
Definition: fd.c:258

◆ AtEOSubXact_Files()

void AtEOSubXact_Files ( bool  isCommit,
SubTransactionId  mySubid,
SubTransactionId  parentSubid 
)

Definition at line 2966 of file fd.c.

References AllocateDesc::create_subid, FreeDesc(), i, and numAllocatedDescs.

Referenced by AbortSubTransaction(), and CommitSubTransaction().

2968 {
2969  Index i;
2970 
2971  for (i = 0; i < numAllocatedDescs; i++)
2972  {
2973  if (allocatedDescs[i].create_subid == mySubid)
2974  {
2975  if (isCommit)
2976  allocatedDescs[i].create_subid = parentSubid;
2977  else
2978  {
2979  /* have to recheck the item after FreeDesc (ugly) */
2980  FreeDesc(&allocatedDescs[i--]);
2981  }
2982  }
2983  }
2984 }
static AllocateDesc * allocatedDescs
Definition: fd.c:260
static int FreeDesc(AllocateDesc *desc)
Definition: fd.c:2577
unsigned int Index
Definition: c.h:549
SubTransactionId create_subid
Definition: fd.c:249
int i
static int numAllocatedDescs
Definition: fd.c:258

◆ AtEOXact_Files()

void AtEOXact_Files ( bool  isCommit)

Definition at line 2999 of file fd.c.

References CleanupTempFiles(), numTempTableSpaces, and tempTableSpaces.

Referenced by AbortTransaction(), AutoVacLauncherMain(), BackgroundWriterMain(), CheckpointerMain(), CommitTransaction(), PrepareTransaction(), and WalWriterMain().

3000 {
3001  CleanupTempFiles(isCommit, false);
3002  tempTableSpaces = NULL;
3003  numTempTableSpaces = -1;
3004 }
static int numTempTableSpaces
Definition: fd.c:280
static Oid * tempTableSpaces
Definition: fd.c:279
static void CleanupTempFiles(bool isCommit, bool isProcExit)
Definition: fd.c:3031

◆ BasicOpenFile()

int BasicOpenFile ( const char *  fileName,
int  fileFlags 
)

Definition at line 1033 of file fd.c.

References BasicOpenFilePerm(), and pg_file_create_mode.

Referenced by AlterSystemSetConfigFile(), ReadControlFile(), update_controlfile(), wal_segment_open(), WalSndSegmentOpen(), WriteControlFile(), XLogFileInit(), XLogFileInitInternal(), XLogFileOpen(), and XLogFileRead().

1034 {
1035  return BasicOpenFilePerm(fileName, fileFlags, pg_file_create_mode);
1036 }
int pg_file_create_mode
Definition: file_perm.c:19
int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode)
Definition: fd.c:1055

◆ BasicOpenFilePerm()

int BasicOpenFilePerm ( const char *  fileName,
int  fileFlags,
mode_t  fileMode 
)

Definition at line 1055 of file fd.c.

References close, ereport, errcode(), errmsg(), vfd::fd, LOG, O_DSYNC, PG_O_DIRECT, ReleaseLruFile(), and StaticAssertStmt.

Referenced by BasicOpenFile(), LruInsert(), OpenTransientFilePerm(), PathNameOpenFilePerm(), and readRecoverySignalFile().

1056 {
1057  int fd;
1058 
1059 tryAgain:
1060 #ifdef PG_O_DIRECT_USE_F_NOCACHE
1061 
1062  /*
1063  * The value we defined to stand in for O_DIRECT when simulating it with
1064  * F_NOCACHE had better not collide with any of the standard flags.
1065  */
1067  (O_APPEND |
1068  O_CREAT |
1069  O_EXCL |
1070  O_RDWR |
1071  O_RDONLY |
1072  O_SYNC |
1073  O_TRUNC |
1074  O_WRONLY)) == 0,
1075  "PG_O_DIRECT value collides with standard flag");
1076 #if defined(O_CLOEXEC)
1077  StaticAssertStmt((PG_O_DIRECT & O_CLOEXEC) == 0,
1078  "PG_O_DIRECT value collides with O_CLOEXEC");
1079 #endif
1080 #if defined(O_DSYNC)
1082  "PG_O_DIRECT value collides with O_DSYNC");
1083 #endif
1084 
1085  fd = open(fileName, fileFlags & ~PG_O_DIRECT, fileMode);
1086 #else
1087  fd = open(fileName, fileFlags, fileMode);
1088 #endif
1089 
1090  if (fd >= 0)
1091  {
1092 #ifdef PG_O_DIRECT_USE_F_NOCACHE
1093  if (fileFlags & PG_O_DIRECT)
1094  {
1095  if (fcntl(fd, F_NOCACHE, 1) < 0)
1096  {
1097  int save_errno = errno;
1098 
1099  close(fd);
1100  errno = save_errno;
1101  return -1;
1102  }
1103  }
1104 #endif
1105 
1106  return fd; /* success! */
1107  }
1108 
1109  if (errno == EMFILE || errno == ENFILE)
1110  {
1111  int save_errno = errno;
1112 
1113  ereport(LOG,
1114  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
1115  errmsg("out of file descriptors: %m; release and retry")));
1116  errno = 0;
1117  if (ReleaseLruFile())
1118  goto tryAgain;
1119  errno = save_errno;
1120  }
1121 
1122  return -1; /* failure */
1123 }
int errcode(int sqlerrcode)
Definition: elog.c:698
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define StaticAssertStmt(condition, errmessage)
Definition: c.h:918
static bool ReleaseLruFile(void)
Definition: fd.c:1335
#define PG_O_DIRECT
Definition: fd.h:95
#define O_DSYNC
Definition: win32_port.h:328
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define close(a)
Definition: win32.h:12

◆ closeAllVfds()

void closeAllVfds ( void  )

Definition at line 2855 of file fd.c.

References Assert, FileIsNotOpen, i, LruDelete(), and SizeVfdCache.

Referenced by standard_ProcessUtility().

2856 {
2857  Index i;
2858 
2859  if (SizeVfdCache > 0)
2860  {
2861  Assert(FileIsNotOpen(0)); /* Make sure ring not corrupted */
2862  for (i = 1; i < SizeVfdCache; i++)
2863  {
2864  if (!FileIsNotOpen(i))
2865  LruDelete(i);
2866  }
2867  }
2868 }
static Size SizeVfdCache
Definition: fd.c:213
static void LruDelete(File file)
Definition: fd.c:1240
#define FileIsNotOpen(file)
Definition: fd.c:185
unsigned int Index
Definition: c.h:549
#define Assert(condition)
Definition: c.h:804
int i

◆ ClosePipeStream()

int ClosePipeStream ( FILE *  file)

Definition at line 2826 of file fd.c.

References AllocateDescPipe, AllocateDesc::desc, DO_DB, elog, AllocateDesc::file, FreeDesc(), i, AllocateDesc::kind, LOG, numAllocatedDescs, and WARNING.

Referenced by ClosePipeFromProgram(), ClosePipeToProgram(), pg_import_system_collations(), and run_ssl_passphrase_command().

2827 {
2828  int i;
2829 
2830  DO_DB(elog(LOG, "ClosePipeStream: Allocated %d", numAllocatedDescs));
2831 
2832  /* Remove file from list of allocated files, if it's present */
2833  for (i = numAllocatedDescs; --i >= 0;)
2834  {
2835  AllocateDesc *desc = &allocatedDescs[i];
2836 
2837  if (desc->kind == AllocateDescPipe && desc->desc.file == file)
2838  return FreeDesc(desc);
2839  }
2840 
2841  /* Only get here if someone passes us a file not in allocatedDescs */
2842  elog(WARNING, "file passed to ClosePipeStream was not obtained from OpenPipeStream");
2843 
2844  return pclose(file);
2845 }
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
#define DO_DB(A)
Definition: fd.c:176
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static int FreeDesc(AllocateDesc *desc)
Definition: fd.c:2577
#define WARNING
Definition: elog.h:40
FILE * file
Definition: fd.c:252
#define elog(elevel,...)
Definition: elog.h:232
int i
static int numAllocatedDescs
Definition: fd.c:258

◆ CloseTransientFile()

int CloseTransientFile ( int  fd)

Definition at line 2644 of file fd.c.

References AllocateDescRawFD, close, AllocateDesc::desc, DO_DB, elog, AllocateDesc::fd, FreeDesc(), i, AllocateDesc::kind, LOG, numAllocatedDescs, and WARNING.

Referenced by ApplyLogicalMappingFile(), be_lo_export(), CheckPointLogicalRewriteHeap(), CheckPointReplicationOrigin(), copy_file(), dsm_impl_mmap(), durable_rename(), fsync_fname_ext(), get_controlfile(), heap_xlog_logical_rewrite(), lo_import_internal(), load_relmap_file(), looks_like_temp_rel_name(), perform_base_backup(), pg_truncate(), qtext_load_file(), qtext_store(), ReadTwoPhaseFile(), RecreateTwoPhaseFile(), ReorderBufferSerializeChange(), ReorderBufferSerializeTXN(), RestoreSlotFromDisk(), SaveSlotToPath(), sendFile(), SendTimeLineHistory(), SimpleLruDoesPhysicalPageExist(), SimpleLruWriteAll(), SlruInternalWritePage(), SlruPhysicalReadPage(), SlruPhysicalWritePage(), SlruSyncFileTag(), SnapBuildRestore(), SnapBuildSerialize(), StartupReplicationOrigin(), walkdir(), write_relmap_file(), writeTimeLineHistory(), writeTimeLineHistoryFile(), and XLogFileCopy().

2645 {
2646  int i;
2647 
2648  DO_DB(elog(LOG, "CloseTransientFile: Allocated %d", numAllocatedDescs));
2649 
2650  /* Remove fd from list of allocated files, if it's present */
2651  for (i = numAllocatedDescs; --i >= 0;)
2652  {
2653  AllocateDesc *desc = &allocatedDescs[i];
2654 
2655  if (desc->kind == AllocateDescRawFD && desc->desc.fd == fd)
2656  return FreeDesc(desc);
2657  }
2658 
2659  /* Only get here if someone passes us a file not in allocatedDescs */
2660  elog(WARNING, "fd passed to CloseTransientFile was not obtained from OpenTransientFile");
2661 
2662  return close(fd);
2663 }
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
#define DO_DB(A)
Definition: fd.c:176
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static int fd(const char *x, int i)
Definition: preproc-init.c:105
static int FreeDesc(AllocateDesc *desc)
Definition: fd.c:2577
#define WARNING
Definition: elog.h:40
int fd
Definition: fd.c:254
#define elog(elevel,...)
Definition: elog.h:232
int i
#define close(a)
Definition: win32.h:12
static int numAllocatedDescs
Definition: fd.c:258

◆ data_sync_elevel()

◆ durable_rename()

int durable_rename ( const char *  oldfile,
const char *  newfile,
int  loglevel 
)

Definition at line 692 of file fd.c.

References CloseTransientFile(), ereport, errcode_for_file_access(), errmsg(), vfd::fd, fsync_fname_ext(), fsync_parent_path(), OpenTransientFile(), PG_BINARY, and pg_fsync().

Referenced by AlterSystemSetConfigFile(), apw_dump_now(), BaseBackup(), CancelBackup(), CheckPointReplicationOrigin(), dir_close(), KeepFileRestoredFromArchive(), pgarch_archiveDone(), pgss_shmem_shutdown(), StartupXLOG(), and XLogArchiveForceDone().

693 {
694  int fd;
695 
696  /*
697  * First fsync the old and target path (if it exists), to ensure that they
698  * are properly persistent on disk. Syncing the target file is not
699  * strictly necessary, but it makes it easier to reason about crashes;
700  * because it's then guaranteed that either source or target file exists
701  * after a crash.
702  */
703  if (fsync_fname_ext(oldfile, false, false, elevel) != 0)
704  return -1;
705 
706  fd = OpenTransientFile(newfile, PG_BINARY | O_RDWR);
707  if (fd < 0)
708  {
709  if (errno != ENOENT)
710  {
711  ereport(elevel,
713  errmsg("could not open file \"%s\": %m", newfile)));
714  return -1;
715  }
716  }
717  else
718  {
719  if (pg_fsync(fd) != 0)
720  {
721  int save_errno;
722 
723  /* close file upon error, might not be in transaction context */
724  save_errno = errno;
725  CloseTransientFile(fd);
726  errno = save_errno;
727 
728  ereport(elevel,
730  errmsg("could not fsync file \"%s\": %m", newfile)));
731  return -1;
732  }
733 
734  if (CloseTransientFile(fd) != 0)
735  {
736  ereport(elevel,
738  errmsg("could not close file \"%s\": %m", newfile)));
739  return -1;
740  }
741  }
742 
743  /* Time to do the real deal... */
744  if (rename(oldfile, newfile) < 0)
745  {
746  ereport(elevel,
748  errmsg("could not rename file \"%s\" to \"%s\": %m",
749  oldfile, newfile)));
750  return -1;
751  }
752 
753  /*
754  * To guarantee renaming the file is persistent, fsync the file with its
755  * new name, and its containing directory.
756  */
757  if (fsync_fname_ext(newfile, false, false, elevel) != 0)
758  return -1;
759 
760  if (fsync_parent_path(newfile, elevel) != 0)
761  return -1;
762 
763  return 0;
764 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define PG_BINARY
Definition: c.h:1271
int OpenTransientFile(const char *fileName, int fileFlags)
Definition: fd.c:2467
int errcode_for_file_access(void)
Definition: elog.c:721
int CloseTransientFile(int fd)
Definition: fd.c:2644
static int elevel
Definition: vacuumlazy.c:403
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909
int pg_fsync(int fd)
Definition: fd.c:352
int fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel)
Definition: fd.c:3619
static int fsync_parent_path(const char *fname, int elevel)
Definition: fd.c:3695

◆ durable_rename_excl()

int durable_rename_excl ( const char *  oldfile,
const char *  newfile,
int  loglevel 
)

Definition at line 822 of file fd.c.

References ereport, errcode_for_file_access(), errmsg(), fsync_fname_ext(), fsync_parent_path(), and link().

Referenced by InstallXLogFileSegment(), writeTimeLineHistory(), and writeTimeLineHistoryFile().

823 {
824  /*
825  * Ensure that, if we crash directly after the rename/link, a file with
826  * valid contents is moved into place.
827  */
828  if (fsync_fname_ext(oldfile, false, false, elevel) != 0)
829  return -1;
830 
831 #ifdef HAVE_WORKING_LINK
832  if (link(oldfile, newfile) < 0)
833  {
834  ereport(elevel,
836  errmsg("could not link file \"%s\" to \"%s\": %m",
837  oldfile, newfile)));
838  return -1;
839  }
840  unlink(oldfile);
841 #else
842  if (rename(oldfile, newfile) < 0)
843  {
844  ereport(elevel,
846  errmsg("could not rename file \"%s\" to \"%s\": %m",
847  oldfile, newfile)));
848  return -1;
849  }
850 #endif
851 
852  /*
853  * Make change persistent in case of an OS crash, both the new entry and
854  * its parent directory need to be flushed.
855  */
856  if (fsync_fname_ext(newfile, false, false, elevel) != 0)
857  return -1;
858 
859  /* Same for parent directory */
860  if (fsync_parent_path(newfile, elevel) != 0)
861  return -1;
862 
863  return 0;
864 }
int errcode_for_file_access(void)
Definition: elog.c:721
static int elevel
Definition: vacuumlazy.c:403
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909
int link(const char *src, const char *dst)
int fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel)
Definition: fd.c:3619
static int fsync_parent_path(const char *fname, int elevel)
Definition: fd.c:3695

◆ durable_unlink()

int durable_unlink ( const char *  fname,
int  loglevel 
)

Definition at line 782 of file fd.c.

References ereport, errcode_for_file_access(), errmsg(), and fsync_parent_path().

Referenced by do_pg_stop_backup(), exitArchiveRecovery(), InstallXLogFileSegment(), and RemoveXlogFile().

783 {
784  if (unlink(fname) < 0)
785  {
786  ereport(elevel,
788  errmsg("could not remove file \"%s\": %m",
789  fname)));
790  return -1;
791  }
792 
793  /*
794  * To guarantee that the removal of the file is persistent, fsync its
795  * parent directory.
796  */
797  if (fsync_parent_path(fname, elevel) != 0)
798  return -1;
799 
800  return 0;
801 }
int errcode_for_file_access(void)
Definition: elog.c:721
static int elevel
Definition: vacuumlazy.c:403
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909
static int fsync_parent_path(const char *fname, int elevel)
Definition: fd.c:3695

◆ FileClose()

void FileClose ( File  file)

Definition at line 1917 of file fd.c.

References Assert, close, data_sync_elevel(), Delete(), DO_DB, elog, ereport, errcode_for_file_access(), errmsg(), vfd::fd, FD_DELETE_AT_CLOSE, FD_TEMP_FILE_LIMIT, vfd::fdstate, FileIsNotOpen, FileIsValid, vfd::fileName, vfd::fileSize, FreeVfd(), LOG, nfile, ReportTemporaryFileUsage(), ResourceOwnerForgetFile(), vfd::resowner, stat::st_size, stat, temporary_files_size, and VFD_CLOSED.

Referenced by BufFileClose(), BufFileTruncateShared(), CleanupTempFiles(), logical_end_heap_rewrite(), mdclose(), mdimmedsync(), mdsyncfiletag(), mdtruncate(), ReorderBufferIterTXNFinish(), ReorderBufferRestoreChanges(), and ResourceOwnerReleaseInternal().

1918 {
1919  Vfd *vfdP;
1920 
1921  Assert(FileIsValid(file));
1922 
1923  DO_DB(elog(LOG, "FileClose: %d (%s)",
1924  file, VfdCache[file].fileName));
1925 
1926  vfdP = &VfdCache[file];
1927 
1928  if (!FileIsNotOpen(file))
1929  {
1930  /* close the file */
1931  if (close(vfdP->fd) != 0)
1932  {
1933  /*
1934  * We may need to panic on failure to close non-temporary files;
1935  * see LruDelete.
1936  */
1938  "could not close file \"%s\": %m", vfdP->fileName);
1939  }
1940 
1941  --nfile;
1942  vfdP->fd = VFD_CLOSED;
1943 
1944  /* remove the file from the lru ring */
1945  Delete(file);
1946  }
1947 
1948  if (vfdP->fdstate & FD_TEMP_FILE_LIMIT)
1949  {
1950  /* Subtract its size from current usage (do first in case of error) */
1951  temporary_files_size -= vfdP->fileSize;
1952  vfdP->fileSize = 0;
1953  }
1954 
1955  /*
1956  * Delete the file if it was temporary, and make a log entry if wanted
1957  */
1958  if (vfdP->fdstate & FD_DELETE_AT_CLOSE)
1959  {
1960  struct stat filestats;
1961  int stat_errno;
1962 
1963  /*
1964  * If we get an error, as could happen within the ereport/elog calls,
1965  * we'll come right back here during transaction abort. Reset the
1966  * flag to ensure that we can't get into an infinite loop. This code
1967  * is arranged to ensure that the worst-case consequence is failing to
1968  * emit log message(s), not failing to attempt the unlink.
1969  */
1970  vfdP->fdstate &= ~FD_DELETE_AT_CLOSE;
1971 
1972 
1973  /* first try the stat() */
1974  if (stat(vfdP->fileName, &filestats))
1975  stat_errno = errno;
1976  else
1977  stat_errno = 0;
1978 
1979  /* in any case do the unlink */
1980  if (unlink(vfdP->fileName))
1981  ereport(LOG,
1983  errmsg("could not delete file \"%s\": %m", vfdP->fileName)));
1984 
1985  /* and last report the stat results */
1986  if (stat_errno == 0)
1987  ReportTemporaryFileUsage(vfdP->fileName, filestats.st_size);
1988  else
1989  {
1990  errno = stat_errno;
1991  ereport(LOG,
1993  errmsg("could not stat file \"%s\": %m", vfdP->fileName)));
1994  }
1995  }
1996 
1997  /* Unregister it from the resource owner */
1998  if (vfdP->resowner)
1999  ResourceOwnerForgetFile(vfdP->resowner, file);
2000 
2001  /*
2002  * Return the Vfd slot to the free list
2003  */
2004  FreeVfd(file);
2005 }
#define FD_TEMP_FILE_LIMIT
Definition: fd.c:190
#define DO_DB(A)
Definition: fd.c:176
#define FD_DELETE_AT_CLOSE
Definition: fd.c:188
static Vfd * VfdCache
Definition: fd.c:212
static void Delete(File file)
Definition: fd.c:1221
#define LOG
Definition: elog.h:26
char * fileName
Definition: fd.c:201
int errcode_for_file_access(void)
Definition: elog.c:721
static int nfile
Definition: fd.c:218
unsigned short fdstate
Definition: fd.c:195
Definition: fd.c:192
off_t fileSize
Definition: fd.c:200
int fd
Definition: fd.c:194
ResourceOwner resowner
Definition: fd.c:196
static void ReportTemporaryFileUsage(const char *path, off_t size)
Definition: fd.c:1481
#define FileIsNotOpen(file)
Definition: fd.c:185
int data_sync_elevel(int elevel)
Definition: fd.c:3758
#define FileIsValid(file)
Definition: fd.c:182
#define VFD_CLOSED
Definition: fd.c:180
static uint64 temporary_files_size
Definition: fd.c:232
#define ereport(elevel,...)
Definition: elog.h:157
#define Assert(condition)
Definition: c.h:804
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
static void FreeVfd(File file)
Definition: fd.c:1425
#define close(a)
Definition: win32.h:12
void ResourceOwnerForgetFile(ResourceOwner owner, File file)
Definition: resowner.c:1306
#define stat
Definition: win32_port.h:275

◆ FileGetRawDesc()

int FileGetRawDesc ( File  file)

Definition at line 2311 of file fd.c.

References Assert, vfd::fd, and FileIsValid.

2312 {
2313  Assert(FileIsValid(file));
2314  return VfdCache[file].fd;
2315 }
static Vfd * VfdCache
Definition: fd.c:212
int fd
Definition: fd.c:194
#define FileIsValid(file)
Definition: fd.c:182
#define Assert(condition)
Definition: c.h:804

◆ FileGetRawFlags()

int FileGetRawFlags ( File  file)

Definition at line 2321 of file fd.c.

References Assert, vfd::fileFlags, and FileIsValid.

2322 {
2323  Assert(FileIsValid(file));
2324  return VfdCache[file].fileFlags;
2325 }
static Vfd * VfdCache
Definition: fd.c:212
#define FileIsValid(file)
Definition: fd.c:182
#define Assert(condition)
Definition: c.h:804
int fileFlags
Definition: fd.c:203

◆ FileGetRawMode()

mode_t FileGetRawMode ( File  file)

Definition at line 2331 of file fd.c.

References Assert, FileIsValid, and vfd::fileMode.

2332 {
2333  Assert(FileIsValid(file));
2334  return VfdCache[file].fileMode;
2335 }
static Vfd * VfdCache
Definition: fd.c:212
mode_t fileMode
Definition: fd.c:204
#define FileIsValid(file)
Definition: fd.c:182
#define Assert(condition)
Definition: c.h:804

◆ FilePathName()

char* FilePathName ( File  file)

Definition at line 2295 of file fd.c.

References Assert, FileIsValid, and vfd::fileName.

Referenced by _mdnblocks(), BufFileDumpBuffer(), BufFileLoadBuffer(), BufFileSeek(), BufFileSize(), BufFileTruncateShared(), mdextend(), mdimmedsync(), mdread(), mdsyncfiletag(), mdtruncate(), mdwrite(), and register_dirty_segment().

2296 {
2297  Assert(FileIsValid(file));
2298 
2299  return VfdCache[file].fileName;
2300 }
static Vfd * VfdCache
Definition: fd.c:212
char * fileName
Definition: fd.c:201
#define FileIsValid(file)
Definition: fd.c:182
#define Assert(condition)
Definition: c.h:804

◆ FilePrefetch()

int FilePrefetch ( File  file,
off_t  offset,
int  amount,
uint32  wait_event_info 
)

Definition at line 2017 of file fd.c.

References Assert, DO_DB, elog, vfd::fd, FileAccess(), FileIsValid, vfd::fileName, INT64_FORMAT, LOG, pgstat_report_wait_end(), and pgstat_report_wait_start().

Referenced by mdprefetch().

2018 {
2019 #if defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
2020  int returnCode;
2021 
2022  Assert(FileIsValid(file));
2023 
2024  DO_DB(elog(LOG, "FilePrefetch: %d (%s) " INT64_FORMAT " %d",
2025  file, VfdCache[file].fileName,
2026  (int64) offset, amount));
2027 
2028  returnCode = FileAccess(file);
2029  if (returnCode < 0)
2030  return returnCode;
2031 
2032  pgstat_report_wait_start(wait_event_info);
2033  returnCode = posix_fadvise(VfdCache[file].fd, offset, amount,
2034  POSIX_FADV_WILLNEED);
2036 
2037  return returnCode;
2038 #else
2039  Assert(FileIsValid(file));
2040  return 0;
2041 #endif
2042 }
static void pgstat_report_wait_end(void)
Definition: wait_event.h:278
#define DO_DB(A)
Definition: fd.c:176
static Vfd * VfdCache
Definition: fd.c:212
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:262
#define FileIsValid(file)
Definition: fd.c:182
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define INT64_FORMAT
Definition: c.h:483
#define elog(elevel,...)
Definition: elog.h:232

◆ FileRead()

int FileRead ( File  file,
char *  buffer,
int  amount,
off_t  offset,
uint32  wait_event_info 
)

Definition at line 2068 of file fd.c.

References _dosmaperr(), Assert, DO_DB, EINTR, elog, error(), vfd::fd, FileAccess(), FileIsValid, vfd::fileName, INT64_FORMAT, LOG, pg_pread(), pg_usleep(), pgstat_report_wait_end(), and pgstat_report_wait_start().

Referenced by BufFileLoadBuffer(), mdread(), and ReorderBufferRestoreChanges().

2070 {
2071  int returnCode;
2072  Vfd *vfdP;
2073 
2074  Assert(FileIsValid(file));
2075 
2076  DO_DB(elog(LOG, "FileRead: %d (%s) " INT64_FORMAT " %d %p",
2077  file, VfdCache[file].fileName,
2078  (int64) offset,
2079  amount, buffer));
2080 
2081  returnCode = FileAccess(file);
2082  if (returnCode < 0)
2083  return returnCode;
2084 
2085  vfdP = &VfdCache[file];
2086 
2087 retry:
2088  pgstat_report_wait_start(wait_event_info);
2089  returnCode = pg_pread(vfdP->fd, buffer, amount, offset);
2091 
2092  if (returnCode < 0)
2093  {
2094  /*
2095  * Windows may run out of kernel buffers and return "Insufficient
2096  * system resources" error. Wait a bit and retry to solve it.
2097  *
2098  * It is rumored that EINTR is also possible on some Unix filesystems,
2099  * in which case immediate retry is indicated.
2100  */
2101 #ifdef WIN32
2102  DWORD error = GetLastError();
2103 
2104  switch (error)
2105  {
2106  case ERROR_NO_SYSTEM_RESOURCES:
2107  pg_usleep(1000L);
2108  errno = EINTR;
2109  break;
2110  default:
2111  _dosmaperr(error);
2112  break;
2113  }
2114 #endif
2115  /* OK to retry if interrupted */
2116  if (errno == EINTR)
2117  goto retry;
2118  }
2119 
2120  return returnCode;
2121 }
static void pgstat_report_wait_end(void)
Definition: wait_event.h:278
static void error(void)
Definition: sql-dyntest.c:147
#define DO_DB(A)
Definition: fd.c:176
void _dosmaperr(unsigned long)
Definition: win32error.c:171
static Vfd * VfdCache
Definition: fd.c:212
#define LOG
Definition: elog.h:26
ssize_t pg_pread(int fd, void *buf, size_t nbyte, off_t offset)
Definition: pread.c:27
void pg_usleep(long microsec)
Definition: signal.c:53
Definition: fd.c:192
int fd
Definition: fd.c:194
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:262
#define FileIsValid(file)
Definition: fd.c:182
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define INT64_FORMAT
Definition: c.h:483
#define elog(elevel,...)
Definition: elog.h:232
#define EINTR
Definition: win32_port.h:343

◆ FileSize()

off_t FileSize ( File  file)

Definition at line 2243 of file fd.c.

References Assert, DO_DB, elog, vfd::fd, FileAccess(), FileIsNotOpen, FileIsValid, vfd::fileName, and LOG.

Referenced by _mdnblocks(), BufFileSeek(), and BufFileSize().

2244 {
2245  Assert(FileIsValid(file));
2246 
2247  DO_DB(elog(LOG, "FileSize %d (%s)",
2248  file, VfdCache[file].fileName));
2249 
2250  if (FileIsNotOpen(file))
2251  {
2252  if (FileAccess(file) < 0)
2253  return (off_t) -1;
2254  }
2255 
2256  return lseek(VfdCache[file].fd, 0, SEEK_END);
2257 }
#define DO_DB(A)
Definition: fd.c:176
static Vfd * VfdCache
Definition: fd.c:212
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define FileIsNotOpen(file)
Definition: fd.c:185
#define FileIsValid(file)
Definition: fd.c:182
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define elog(elevel,...)
Definition: elog.h:232

◆ FileSync()

int FileSync ( File  file,
uint32  wait_event_info 
)

Definition at line 2222 of file fd.c.

References Assert, DO_DB, elog, vfd::fd, FileAccess(), FileIsValid, vfd::fileName, LOG, pg_fsync(), pgstat_report_wait_end(), and pgstat_report_wait_start().

Referenced by logical_end_heap_rewrite(), mdimmedsync(), mdsyncfiletag(), and register_dirty_segment().

2223 {
2224  int returnCode;
2225 
2226  Assert(FileIsValid(file));
2227 
2228  DO_DB(elog(LOG, "FileSync: %d (%s)",
2229  file, VfdCache[file].fileName));
2230 
2231  returnCode = FileAccess(file);
2232  if (returnCode < 0)
2233  return returnCode;
2234 
2235  pgstat_report_wait_start(wait_event_info);
2236  returnCode = pg_fsync(VfdCache[file].fd);
2238 
2239  return returnCode;
2240 }
static void pgstat_report_wait_end(void)
Definition: wait_event.h:278
#define DO_DB(A)
Definition: fd.c:176
static Vfd * VfdCache
Definition: fd.c:212
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:262
#define FileIsValid(file)
Definition: fd.c:182
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define elog(elevel,...)
Definition: elog.h:232
int pg_fsync(int fd)
Definition: fd.c:352

◆ FileTruncate()

int FileTruncate ( File  file,
off_t  offset,
uint32  wait_event_info 
)

Definition at line 2260 of file fd.c.

References Assert, DO_DB, elog, vfd::fd, FD_TEMP_FILE_LIMIT, vfd::fdstate, FileAccess(), FileIsValid, vfd::fileName, vfd::fileSize, ftruncate, LOG, pgstat_report_wait_end(), pgstat_report_wait_start(), and temporary_files_size.

Referenced by BufFileTruncateShared(), and mdtruncate().

2261 {
2262  int returnCode;
2263 
2264  Assert(FileIsValid(file));
2265 
2266  DO_DB(elog(LOG, "FileTruncate %d (%s)",
2267  file, VfdCache[file].fileName));
2268 
2269  returnCode = FileAccess(file);
2270  if (returnCode < 0)
2271  return returnCode;
2272 
2273  pgstat_report_wait_start(wait_event_info);
2274  returnCode = ftruncate(VfdCache[file].fd, offset);
2276 
2277  if (returnCode == 0 && VfdCache[file].fileSize > offset)
2278  {
2279  /* adjust our state for truncation of a temp file */
2280  Assert(VfdCache[file].fdstate & FD_TEMP_FILE_LIMIT);
2281  temporary_files_size -= VfdCache[file].fileSize - offset;
2282  VfdCache[file].fileSize = offset;
2283  }
2284 
2285  return returnCode;
2286 }
static void pgstat_report_wait_end(void)
Definition: wait_event.h:278
#define FD_TEMP_FILE_LIMIT
Definition: fd.c:190
#define DO_DB(A)
Definition: fd.c:176
static Vfd * VfdCache
Definition: fd.c:212
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
off_t fileSize
Definition: fd.c:200
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:262
#define FileIsValid(file)
Definition: fd.c:182
static uint64 temporary_files_size
Definition: fd.c:232
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define elog(elevel,...)
Definition: elog.h:232
#define ftruncate(a, b)
Definition: win32_port.h:65

◆ FileWrite()

int FileWrite ( File  file,
char *  buffer,
int  amount,
off_t  offset,
uint32  wait_event_info 
)

Definition at line 2124 of file fd.c.

References _dosmaperr(), Assert, DO_DB, EINTR, elog, ereport, errcode(), errmsg(), ERROR, error(), vfd::fd, FD_TEMP_FILE_LIMIT, vfd::fdstate, FileAccess(), FileIsValid, vfd::fileName, vfd::fileSize, INT64_FORMAT, LOG, pg_pwrite(), pg_usleep(), pgstat_report_wait_end(), pgstat_report_wait_start(), temp_file_limit, and temporary_files_size.

Referenced by BufFileDumpBuffer(), logical_heap_rewrite_flush_mappings(), mdextend(), and mdwrite().

2126 {
2127  int returnCode;
2128  Vfd *vfdP;
2129 
2130  Assert(FileIsValid(file));
2131 
2132  DO_DB(elog(LOG, "FileWrite: %d (%s) " INT64_FORMAT " %d %p",
2133  file, VfdCache[file].fileName,
2134  (int64) offset,
2135  amount, buffer));
2136 
2137  returnCode = FileAccess(file);
2138  if (returnCode < 0)
2139  return returnCode;
2140 
2141  vfdP = &VfdCache[file];
2142 
2143  /*
2144  * If enforcing temp_file_limit and it's a temp file, check to see if the
2145  * write would overrun temp_file_limit, and throw error if so. Note: it's
2146  * really a modularity violation to throw error here; we should set errno
2147  * and return -1. However, there's no way to report a suitable error
2148  * message if we do that. All current callers would just throw error
2149  * immediately anyway, so this is safe at present.
2150  */
2151  if (temp_file_limit >= 0 && (vfdP->fdstate & FD_TEMP_FILE_LIMIT))
2152  {
2153  off_t past_write = offset + amount;
2154 
2155  if (past_write > vfdP->fileSize)
2156  {
2157  uint64 newTotal = temporary_files_size;
2158 
2159  newTotal += past_write - vfdP->fileSize;
2160  if (newTotal > (uint64) temp_file_limit * (uint64) 1024)
2161  ereport(ERROR,
2162  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
2163  errmsg("temporary file size exceeds temp_file_limit (%dkB)",
2164  temp_file_limit)));
2165  }
2166  }
2167 
2168 retry:
2169  errno = 0;
2170  pgstat_report_wait_start(wait_event_info);
2171  returnCode = pg_pwrite(VfdCache[file].fd, buffer, amount, offset);
2173 
2174  /* if write didn't set errno, assume problem is no disk space */
2175  if (returnCode != amount && errno == 0)
2176  errno = ENOSPC;
2177 
2178  if (returnCode >= 0)
2179  {
2180  /*
2181  * Maintain fileSize and temporary_files_size if it's a temp file.
2182  */
2183  if (vfdP->fdstate & FD_TEMP_FILE_LIMIT)
2184  {
2185  off_t past_write = offset + amount;
2186 
2187  if (past_write > vfdP->fileSize)
2188  {
2189  temporary_files_size += past_write - vfdP->fileSize;
2190  vfdP->fileSize = past_write;
2191  }
2192  }
2193  }
2194  else
2195  {
2196  /*
2197  * See comments in FileRead()
2198  */
2199 #ifdef WIN32
2200  DWORD error = GetLastError();
2201 
2202  switch (error)
2203  {
2204  case ERROR_NO_SYSTEM_RESOURCES:
2205  pg_usleep(1000L);
2206  errno = EINTR;
2207  break;
2208  default:
2209  _dosmaperr(error);
2210  break;
2211  }
2212 #endif
2213  /* OK to retry if interrupted */
2214  if (errno == EINTR)
2215  goto retry;
2216  }
2217 
2218  return returnCode;
2219 }
static void pgstat_report_wait_end(void)
Definition: wait_event.h:278
static void error(void)
Definition: sql-dyntest.c:147
#define FD_TEMP_FILE_LIMIT
Definition: fd.c:190
#define DO_DB(A)
Definition: fd.c:176
void _dosmaperr(unsigned long)
Definition: win32error.c:171
static Vfd * VfdCache
Definition: fd.c:212
int errcode(int sqlerrcode)
Definition: elog.c:698
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
ssize_t pg_pwrite(int fd, const void *buf, size_t nbyte, off_t offset)
Definition: pwrite.c:27
void pg_usleep(long microsec)
Definition: signal.c:53
#define ERROR
Definition: elog.h:46
unsigned short fdstate
Definition: fd.c:195
Definition: fd.c:192
off_t fileSize
Definition: fd.c:200
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:262
#define FileIsValid(file)
Definition: fd.c:182
static uint64 temporary_files_size
Definition: fd.c:232
#define ereport(elevel,...)
Definition: elog.h:157
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define INT64_FORMAT
Definition: c.h:483
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
#define EINTR
Definition: win32_port.h:343
int temp_file_limit
Definition: guc.c:609

◆ FileWriteback()

void FileWriteback ( File  file,
off_t  offset,
off_t  nbytes,
uint32  wait_event_info 
)

Definition at line 2045 of file fd.c.

References Assert, DO_DB, elog, vfd::fd, FileAccess(), FileIsValid, vfd::fileName, INT64_FORMAT, LOG, pg_flush_data(), pgstat_report_wait_end(), and pgstat_report_wait_start().

Referenced by mdwriteback().

2046 {
2047  int returnCode;
2048 
2049  Assert(FileIsValid(file));
2050 
2051  DO_DB(elog(LOG, "FileWriteback: %d (%s) " INT64_FORMAT " " INT64_FORMAT,
2052  file, VfdCache[file].fileName,
2053  (int64) offset, (int64) nbytes));
2054 
2055  if (nbytes <= 0)
2056  return;
2057 
2058  returnCode = FileAccess(file);
2059  if (returnCode < 0)
2060  return;
2061 
2062  pgstat_report_wait_start(wait_event_info);
2063  pg_flush_data(VfdCache[file].fd, offset, nbytes);
2065 }
static void pgstat_report_wait_end(void)
Definition: wait_event.h:278
#define DO_DB(A)
Definition: fd.c:176
static Vfd * VfdCache
Definition: fd.c:212
#define LOG
Definition: elog.h:26
static int fd(const char *x, int i)
Definition: preproc-init.c:105
static void pgstat_report_wait_start(uint32 wait_event_info)
Definition: wait_event.h:262
void pg_flush_data(int fd, off_t offset, off_t nbytes)
Definition: fd.c:462
#define FileIsValid(file)
Definition: fd.c:182
static int FileAccess(File file)
Definition: fd.c:1445
#define Assert(condition)
Definition: c.h:804
#define INT64_FORMAT
Definition: c.h:483
#define elog(elevel,...)
Definition: elog.h:232

◆ FreeDir()

int FreeDir ( DIR dir)

Definition at line 2796 of file fd.c.

References AllocateDescDir, closedir(), AllocateDesc::desc, AllocateDesc::dir, DO_DB, elog, FreeDesc(), i, AllocateDesc::kind, LOG, numAllocatedDescs, and WARNING.

Referenced by calculate_database_size(), calculate_tablespace_size(), CheckPointLogicalRewriteHeap(), CheckPointSnapBuild(), CleanupBackupHistory(), copydir(), db_dir_size(), DeleteAllExportedSnapshotFiles(), destroy_tablespace_directories(), directory_is_empty(), do_pg_start_backup(), dsm_cleanup_for_mmap(), extension_file_exists(), get_ext_ver_list(), getInstallationPaths(), movedb(), ParseTzFile(), perform_base_backup(), pg_available_extension_versions(), pg_available_extensions(), pg_logdir_ls_internal(), pg_ls_dir(), pg_ls_dir_files(), pg_tablespace_databases(), pg_tzenumerate_end(), pg_tzenumerate_next(), pgarch_readyXlog(), pgstat_reset_remove_files(), RelationCacheInitFileRemove(), RelationCacheInitFileRemoveInDir(), RemoveNonParentXlogFiles(), RemoveOldXlogFiles(), RemovePgTempFiles(), RemovePgTempFilesInDir(), RemovePgTempRelationFiles(), RemovePgTempRelationFilesInDbspace(), RemoveTempXlogFiles(), ReorderBufferCleanupSerializedTXNs(), ResetUnloggedRelations(), ResetUnloggedRelationsInDbspaceDir(), ResetUnloggedRelationsInTablespaceDir(), restoreTwoPhaseData(), scan_directory_ci(), sendDir(), SlruScanDirectory(), StartupReorderBuffer(), StartupReplicationSlots(), SyncDataDirectory(), UpdateLogicalMappings(), and walkdir().

2797 {
2798  int i;
2799 
2800  /* Nothing to do if AllocateDir failed */
2801  if (dir == NULL)
2802  return 0;
2803 
2804  DO_DB(elog(LOG, "FreeDir: Allocated %d", numAllocatedDescs));
2805 
2806  /* Remove dir from list of allocated dirs, if it's present */
2807  for (i = numAllocatedDescs; --i >= 0;)
2808  {
2809  AllocateDesc *desc = &allocatedDescs[i];
2810 
2811  if (desc->kind == AllocateDescDir && desc->desc.dir == dir)
2812  return FreeDesc(desc);
2813  }
2814 
2815  /* Only get here if someone passes us a dir not in allocatedDescs */
2816  elog(WARNING, "dir passed to FreeDir was not obtained from AllocateDir");
2817 
2818  return closedir(dir);
2819 }
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
DIR * dir
Definition: fd.c:253
#define DO_DB(A)
Definition: fd.c:176
int closedir(DIR *)
Definition: dirent.c:123
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static int FreeDesc(AllocateDesc *desc)
Definition: fd.c:2577
#define WARNING
Definition: elog.h:40
#define elog(elevel,...)
Definition: elog.h:232
int i
static int numAllocatedDescs
Definition: fd.c:258

◆ FreeFile()

int FreeFile ( FILE *  file)

Definition at line 2616 of file fd.c.

References AllocateDescFile, AllocateDesc::desc, DO_DB, elog, AllocateDesc::file, FreeDesc(), i, AllocateDesc::kind, LOG, numAllocatedDescs, and WARNING.

Referenced by _ShowOption(), AlterSystemSetConfigFile(), apw_dump_now(), apw_load_buffers(), BackendRun(), checkControlFile(), do_pg_start_backup(), do_pg_stop_backup(), EndCopy(), EndCopyFrom(), entry_reset(), existsTimeLineHistory(), ExportSnapshot(), fill_hba_view(), gc_qtexts(), ImportSnapshot(), load_dh_file(), load_hba(), load_ident(), load_relcache_init_file(), parse_extension_control_file(), ParseTzFile(), pg_backup_start_time(), pg_current_logfile(), pg_file_write_internal(), pg_promote(), PGSharedMemoryAttach(), pgss_shmem_shutdown(), pgss_shmem_startup(), pgstat_read_db_statsfile(), pgstat_read_db_statsfile_timestamp(), pgstat_read_statsfiles(), pgstat_write_db_statsfile(), pgstat_write_statsfiles(), PostmasterMarkPIDForWorkerNotify(), read_backup_label(), read_binary_file(), read_tablespace_map(), read_whole_file(), readTimeLineHistory(), tokenize_inc_file(), tsearch_readline_end(), ValidatePgVersion(), write_relcache_init_file(), XLogArchiveForceDone(), and XLogArchiveNotify().

2617 {
2618  int i;
2619 
2620  DO_DB(elog(LOG, "FreeFile: Allocated %d", numAllocatedDescs));
2621 
2622  /* Remove file from list of allocated files, if it's present */
2623  for (i = numAllocatedDescs; --i >= 0;)
2624  {
2625  AllocateDesc *desc = &allocatedDescs[i];
2626 
2627  if (desc->kind == AllocateDescFile && desc->desc.file == file)
2628  return FreeDesc(desc);
2629  }
2630 
2631  /* Only get here if someone passes us a file not in allocatedDescs */
2632  elog(WARNING, "file passed to FreeFile was not obtained from AllocateFile");
2633 
2634  return fclose(file);
2635 }
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
#define DO_DB(A)
Definition: fd.c:176
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static int FreeDesc(AllocateDesc *desc)
Definition: fd.c:2577
#define WARNING
Definition: elog.h:40
FILE * file
Definition: fd.c:252
#define elog(elevel,...)
Definition: elog.h:232
int i
static int numAllocatedDescs
Definition: fd.c:258

◆ fsync_fname()

void fsync_fname ( const char *  fname,
bool  isdir 
)

Definition at line 666 of file fd.c.

References data_sync_elevel(), ERROR, and fsync_fname_ext().

Referenced by _CloseArchive(), CheckPointTwoPhase(), copydir(), CreateSlotOnDisk(), dir_close(), dir_finish(), dir_open_for_write(), main(), ReplicationSlotDropPtr(), ResetUnloggedRelationsInDbspaceDir(), RestoreSlotFromDisk(), SaveSlotToPath(), SimpleLruWriteAll(), SnapBuildRestore(), SnapBuildSerialize(), StartupReplicationSlots(), and tar_finish().

667 {
668  fsync_fname_ext(fname, isdir, false, data_sync_elevel(ERROR));
669 }
#define ERROR
Definition: elog.h:46
int data_sync_elevel(int elevel)
Definition: fd.c:3758
int fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel)
Definition: fd.c:3619

◆ fsync_fname_ext()

int fsync_fname_ext ( const char *  fname,
bool  isdir,
bool  ignore_perm,
int  elevel 
)

Definition at line 3619 of file fd.c.

References CloseTransientFile(), ereport, errcode_for_file_access(), errmsg(), vfd::fd, OpenTransientFile(), PG_BINARY, and pg_fsync().

Referenced by datadir_fsync_fname(), durable_rename(), durable_rename_excl(), fsync_fname(), fsync_parent_path(), and pg_file_sync().

3620 {
3621  int fd;
3622  int flags;
3623  int returncode;
3624 
3625  /*
3626  * Some OSs require directories to be opened read-only whereas other
3627  * systems don't allow us to fsync files opened read-only; so we need both
3628  * cases here. Using O_RDWR will cause us to fail to fsync files that are
3629  * not writable by our userid, but we assume that's OK.
3630  */
3631  flags = PG_BINARY;
3632  if (!isdir)
3633  flags |= O_RDWR;
3634  else
3635  flags |= O_RDONLY;
3636 
3637  fd = OpenTransientFile(fname, flags);
3638 
3639  /*
3640  * Some OSs don't allow us to open directories at all (Windows returns
3641  * EACCES), just ignore the error in that case. If desired also silently
3642  * ignoring errors about unreadable files. Log others.
3643  */
3644  if (fd < 0 && isdir && (errno == EISDIR || errno == EACCES))
3645  return 0;
3646  else if (fd < 0 && ignore_perm && errno == EACCES)
3647  return 0;
3648  else if (fd < 0)
3649  {
3650  ereport(elevel,
3652  errmsg("could not open file \"%s\": %m", fname)));
3653  return -1;
3654  }
3655 
3656  returncode = pg_fsync(fd);
3657 
3658  /*
3659  * Some OSes don't allow us to fsync directories at all, so we can ignore
3660  * those errors. Anything else needs to be logged.
3661  */
3662  if (returncode != 0 && !(isdir && (errno == EBADF || errno == EINVAL)))
3663  {
3664  int save_errno;
3665 
3666  /* close file upon error, might not be in transaction context */
3667  save_errno = errno;
3668  (void) CloseTransientFile(fd);
3669  errno = save_errno;
3670 
3671  ereport(elevel,
3673  errmsg("could not fsync file \"%s\": %m", fname)));
3674  return -1;
3675  }
3676 
3677  if (CloseTransientFile(fd) != 0)
3678  {
3679  ereport(elevel,
3681  errmsg("could not close file \"%s\": %m", fname)));
3682  return -1;
3683  }
3684 
3685  return 0;
3686 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define PG_BINARY
Definition: c.h:1271
int OpenTransientFile(const char *fileName, int fileFlags)
Definition: fd.c:2467
int errcode_for_file_access(void)
Definition: elog.c:721
int CloseTransientFile(int fd)
Definition: fd.c:2644
static int elevel
Definition: vacuumlazy.c:403
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909
int pg_fsync(int fd)
Definition: fd.c:352

◆ GetNextTempTableSpace()

Oid GetNextTempTableSpace ( void  )

Definition at line 2945 of file fd.c.

References InvalidOid, nextTempTableSpace, numTempTableSpaces, and tempTableSpaces.

Referenced by GetDefaultTablespace(), and OpenTemporaryFile().

2946 {
2947  if (numTempTableSpaces > 0)
2948  {
2949  /* Advance nextTempTableSpace counter with wraparound */
2951  nextTempTableSpace = 0;
2953  }
2954  return InvalidOid;
2955 }
static int numTempTableSpaces
Definition: fd.c:280
static int nextTempTableSpace
Definition: fd.c:281
#define InvalidOid
Definition: postgres_ext.h:36
static Oid * tempTableSpaces
Definition: fd.c:279

◆ GetTempTablespaces()

int GetTempTablespaces ( Oid tableSpaces,
int  numSpaces 
)

Definition at line 2927 of file fd.c.

References Assert, i, numTempTableSpaces, tempTableSpaces, and TempTablespacesAreSet().

Referenced by SharedFileSetInit().

2928 {
2929  int i;
2930 
2932  for (i = 0; i < numTempTableSpaces && i < numSpaces; ++i)
2933  tableSpaces[i] = tempTableSpaces[i];
2934 
2935  return i;
2936 }
static int numTempTableSpaces
Definition: fd.c:280
bool TempTablespacesAreSet(void)
Definition: fd.c:2912
#define Assert(condition)
Definition: c.h:804
static Oid * tempTableSpaces
Definition: fd.c:279
int i

◆ InitFileAccess()

void InitFileAccess ( void  )

Definition at line 873 of file fd.c.

References Assert, AtProcExit_Files(), ereport, errcode(), errmsg(), FATAL, vfd::fd, malloc, MemSet, on_proc_exit(), SizeVfdCache, and VFD_CLOSED.

Referenced by BaseInit().

874 {
875  Assert(SizeVfdCache == 0); /* call me only once */
876 
877  /* initialize cache header entry */
878  VfdCache = (Vfd *) malloc(sizeof(Vfd));
879  if (VfdCache == NULL)
880  ereport(FATAL,
881  (errcode(ERRCODE_OUT_OF_MEMORY),
882  errmsg("out of memory")));
883 
884  MemSet((char *) &(VfdCache[0]), 0, sizeof(Vfd));
886 
887  SizeVfdCache = 1;
888 
889  /* register proc-exit hook to ensure temp files are dropped at exit */
891 }
static void AtProcExit_Files(int code, Datum arg)
Definition: fd.c:3013
static Size SizeVfdCache
Definition: fd.c:213
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:305
static Vfd * VfdCache
Definition: fd.c:212
int errcode(int sqlerrcode)
Definition: elog.c:698
#define MemSet(start, val, len)
Definition: c.h:1008
#define malloc(a)
Definition: header.h:50
#define FATAL
Definition: elog.h:49
Definition: fd.c:192
int fd
Definition: fd.c:194
#define VFD_CLOSED
Definition: fd.c:180
#define ereport(elevel,...)
Definition: elog.h:157
#define Assert(condition)
Definition: c.h:804
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ looks_like_temp_rel_name()

bool looks_like_temp_rel_name ( const char *  name)

Definition at line 3284 of file fd.c.

References CloseTransientFile(), ereport, errcode_for_file_access(), errmsg(), vfd::fd, forkname_chars(), LOG, and OpenTransientFile().

Referenced by RemovePgTempRelationFilesInDbspace(), and sendDir().

3285 {
3286  int pos;
3287  int savepos;
3288 
3289  /* Must start with "t". */
3290  if (name[0] != 't')
3291  return false;
3292 
3293  /* Followed by a non-empty string of digits and then an underscore. */
3294  for (pos = 1; isdigit((unsigned char) name[pos]); ++pos)
3295  ;
3296  if (pos == 1 || name[pos] != '_')
3297  return false;
3298 
3299  /* Followed by another nonempty string of digits. */
3300  for (savepos = ++pos; isdigit((unsigned char) name[pos]); ++pos)
3301  ;
3302  if (savepos == pos)
3303  return false;
3304 
3305  /* We might have _forkname or .segment or both. */
3306  if (name[pos] == '_')
3307  {
3308  int forkchar = forkname_chars(&name[pos + 1], NULL);
3309 
3310  if (forkchar <= 0)
3311  return false;
3312  pos += forkchar + 1;
3313  }
3314  if (name[pos] == '.')
3315  {
3316  int segchar;
3317 
3318  for (segchar = 1; isdigit((unsigned char) name[pos + segchar]); ++segchar)
3319  ;
3320  if (segchar <= 1)
3321  return false;
3322  pos += segchar;
3323  }
3324 
3325  /* Now we should be at the end. */
3326  if (name[pos] != '\0')
3327  return false;
3328  return true;
3329 }
int forkname_chars(const char *str, ForkNumber *fork)
Definition: relpath.c:81
const char * name
Definition: encode.c:515

◆ MakePGDirectory()

int MakePGDirectory ( const char *  directoryName)

◆ OpenPipeStream()

FILE* OpenPipeStream ( const char *  command,
const char *  mode 
)

Definition at line 2520 of file fd.c.

References AllocateDescPipe, AllocateDesc::create_subid, AllocateDesc::desc, DO_DB, elog, ereport, errcode(), errmsg(), ERROR, AllocateDesc::file, GetCurrentSubTransactionId(), AllocateDesc::kind, LOG, maxAllocatedDescs, numAllocatedDescs, pqsignal(), ReleaseLruFile(), ReleaseLruFiles(), reserveAllocatedDesc(), SIG_DFL, SIG_IGN, SIGPIPE, and generate_unaccent_rules::stdout.

Referenced by BeginCopyFrom(), BeginCopyTo(), pg_import_system_collations(), and run_ssl_passphrase_command().

2521 {
2522  FILE *file;
2523  int save_errno;
2524 
2525  DO_DB(elog(LOG, "OpenPipeStream: Allocated %d (%s)",
2526  numAllocatedDescs, command));
2527 
2528  /* Can we allocate another non-virtual FD? */
2529  if (!reserveAllocatedDesc())
2530  ereport(ERROR,
2531  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2532  errmsg("exceeded maxAllocatedDescs (%d) while trying to execute command \"%s\"",
2533  maxAllocatedDescs, command)));
2534 
2535  /* Close excess kernel FDs. */
2536  ReleaseLruFiles();
2537 
2538 TryAgain:
2539  fflush(stdout);
2540  fflush(stderr);
2542  errno = 0;
2543  file = popen(command, mode);
2544  save_errno = errno;
2546  errno = save_errno;
2547  if (file != NULL)
2548  {
2550 
2551  desc->kind = AllocateDescPipe;
2552  desc->desc.file = file;
2555  return desc->desc.file;
2556  }
2557 
2558  if (errno == EMFILE || errno == ENFILE)
2559  {
2560  ereport(LOG,
2561  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2562  errmsg("out of file descriptors: %m; release and retry")));
2563  if (ReleaseLruFile())
2564  goto TryAgain;
2565  errno = save_errno;
2566  }
2567 
2568  return NULL;
2569 }
static PgChecksumMode mode
Definition: pg_checksums.c:63
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
#define DO_DB(A)
Definition: fd.c:176
int errcode(int sqlerrcode)
Definition: elog.c:698
static bool reserveAllocatedDesc(void)
Definition: fd.c:2342
#define SIGPIPE
Definition: win32_port.h:164
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static bool ReleaseLruFile(void)
Definition: fd.c:1335
#define ERROR
Definition: elog.h:46
#define SIG_IGN
Definition: win32_port.h:156
static void ReleaseLruFiles(void)
Definition: fd.c:1357
FILE * file
Definition: fd.c:252
#define ereport(elevel,...)
Definition: elog.h:157
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:170
#define SIG_DFL
Definition: win32_port.h:154
SubTransactionId GetCurrentSubTransactionId(void)
Definition: xact.c:723
SubTransactionId create_subid
Definition: fd.c:249
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232
static int maxAllocatedDescs
Definition: fd.c:259
static int numAllocatedDescs
Definition: fd.c:258

◆ OpenTemporaryFile()

File OpenTemporaryFile ( bool  interXact)

Definition at line 1669 of file fd.c.

References CurrentResourceOwner, FD_DELETE_AT_CLOSE, FD_TEMP_FILE_LIMIT, vfd::fdstate, GetNextTempTableSpace(), MyDatabaseTableSpace, numTempTableSpaces, OidIsValid, OpenTemporaryFileInTablespace(), RegisterTemporaryFile(), and ResourceOwnerEnlargeFiles().

Referenced by BufFileCreateTemp(), and extendBufFile().

1670 {
1671  File file = 0;
1672 
1673  /*
1674  * Make sure the current resource owner has space for this File before we
1675  * open it, if we'll be registering it below.
1676  */
1677  if (!interXact)
1679 
1680  /*
1681  * If some temp tablespace(s) have been given to us, try to use the next
1682  * one. If a given tablespace can't be found, we silently fall back to
1683  * the database's default tablespace.
1684  *
1685  * BUT: if the temp file is slated to outlive the current transaction,
1686  * force it into the database's default tablespace, so that it will not
1687  * pose a threat to possible tablespace drop attempts.
1688  */
1689  if (numTempTableSpaces > 0 && !interXact)
1690  {
1691  Oid tblspcOid = GetNextTempTableSpace();
1692 
1693  if (OidIsValid(tblspcOid))
1694  file = OpenTemporaryFileInTablespace(tblspcOid, false);
1695  }
1696 
1697  /*
1698  * If not, or if tablespace is bad, create in database's default
1699  * tablespace. MyDatabaseTableSpace should normally be set before we get
1700  * here, but just in case it isn't, fall back to pg_default tablespace.
1701  */
1702  if (file <= 0)
1705  DEFAULTTABLESPACE_OID,
1706  true);
1707 
1708  /* Mark it for deletion at close and temporary file size limit */
1710 
1711  /* Register it with the current resource owner */
1712  if (!interXact)
1713  RegisterTemporaryFile(file);
1714 
1715  return file;
1716 }
static File OpenTemporaryFileInTablespace(Oid tblspcOid, bool rejectError)
Definition: fd.c:1747
#define FD_TEMP_FILE_LIMIT
Definition: fd.c:190
ResourceOwner CurrentResourceOwner
Definition: resowner.c:146
#define FD_DELETE_AT_CLOSE
Definition: fd.c:188
static Vfd * VfdCache
Definition: fd.c:212
static int numTempTableSpaces
Definition: fd.c:280
unsigned int Oid
Definition: postgres_ext.h:31
#define OidIsValid(objectId)
Definition: c.h:710
Oid MyDatabaseTableSpace
Definition: globals.c:90
Oid GetNextTempTableSpace(void)
Definition: fd.c:2945
unsigned short fdstate
Definition: fd.c:195
static void RegisterTemporaryFile(File file)
Definition: fd.c:1500
void ResourceOwnerEnlargeFiles(ResourceOwner owner)
Definition: resowner.c:1286
int File
Definition: fd.h:54

◆ OpenTransientFile()

◆ OpenTransientFilePerm()

int OpenTransientFilePerm ( const char *  fileName,
int  fileFlags,
mode_t  fileMode 
)

Definition at line 2476 of file fd.c.

References AllocateDescRawFD, BasicOpenFilePerm(), AllocateDesc::create_subid, AllocateDesc::desc, DO_DB, elog, ereport, errcode(), errmsg(), ERROR, vfd::fd, AllocateDesc::fd, GetCurrentSubTransactionId(), AllocateDesc::kind, LOG, maxAllocatedDescs, numAllocatedDescs, ReleaseLruFiles(), and reserveAllocatedDesc().

Referenced by be_lo_export(), and OpenTransientFile().

2477 {
2478  int fd;
2479 
2480  DO_DB(elog(LOG, "OpenTransientFile: Allocated %d (%s)",
2481  numAllocatedDescs, fileName));
2482 
2483  /* Can we allocate another non-virtual FD? */
2484  if (!reserveAllocatedDesc())
2485  ereport(ERROR,
2486  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
2487  errmsg("exceeded maxAllocatedDescs (%d) while trying to open file \"%s\"",
2488  maxAllocatedDescs, fileName)));
2489 
2490  /* Close excess kernel FDs. */
2491  ReleaseLruFiles();
2492 
2493  fd = BasicOpenFilePerm(fileName, fileFlags, fileMode);
2494 
2495  if (fd >= 0)
2496  {
2498 
2499  desc->kind = AllocateDescRawFD;
2500  desc->desc.fd = fd;
2503 
2504  return fd;
2505  }
2506 
2507  return -1; /* failure */
2508 }
union AllocateDesc::@18 desc
static AllocateDesc * allocatedDescs
Definition: fd.c:260
#define DO_DB(A)
Definition: fd.c:176
int errcode(int sqlerrcode)
Definition: elog.c:698
static bool reserveAllocatedDesc(void)
Definition: fd.c:2342
#define LOG
Definition: elog.h:26
AllocateDescKind kind
Definition: fd.c:248
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define ERROR
Definition: elog.h:46
static void ReleaseLruFiles(void)
Definition: fd.c:1357
#define ereport(elevel,...)
Definition: elog.h:157
SubTransactionId GetCurrentSubTransactionId(void)
Definition: xact.c:723
SubTransactionId create_subid
Definition: fd.c:249
int fd
Definition: fd.c:254
int errmsg(const char *fmt,...)
Definition: elog.c:909
int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode)
Definition: fd.c:1055
#define elog(elevel,...)
Definition: elog.h:232
static int maxAllocatedDescs
Definition: fd.c:259
static int numAllocatedDescs
Definition: fd.c:258

◆ PathNameCreateTemporaryDir()

void PathNameCreateTemporaryDir ( const char *  base,
const char *  name 
)

Definition at line 1605 of file fd.c.

References ereport, errcode_for_file_access(), errmsg(), ERROR, and MakePGDirectory().

Referenced by SharedFileSetCreate().

1606 {
1607  if (MakePGDirectory(directory) < 0)
1608  {
1609  if (errno == EEXIST)
1610  return;
1611 
1612  /*
1613  * Failed. Try to create basedir first in case it's missing. Tolerate
1614  * EEXIST to close a race against another process following the same
1615  * algorithm.
1616  */
1617  if (MakePGDirectory(basedir) < 0 && errno != EEXIST)
1618  ereport(ERROR,
1620  errmsg("cannot create temporary directory \"%s\": %m",
1621  basedir)));
1622 
1623  /* Try again. */
1624  if (MakePGDirectory(directory) < 0 && errno != EEXIST)
1625  ereport(ERROR,
1627  errmsg("cannot create temporary subdirectory \"%s\": %m",
1628  directory)));
1629  }
1630 }
static char * basedir
#define ERROR
Definition: elog.h:46
int errcode_for_file_access(void)
Definition: elog.c:721
#define ereport(elevel,...)
Definition: elog.h:157
int MakePGDirectory(const char *directoryName)
Definition: fd.c:3735
static const char * directory
Definition: zic.c:632
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ PathNameCreateTemporaryFile()

File PathNameCreateTemporaryFile ( const char *  name,
bool  error_on_failure 
)

Definition at line 1804 of file fd.c.

References CurrentResourceOwner, ereport, errcode_for_file_access(), errmsg(), ERROR, FD_TEMP_FILE_LIMIT, vfd::fdstate, PathNameOpenFile(), PG_BINARY, RegisterTemporaryFile(), and ResourceOwnerEnlargeFiles().

Referenced by SharedFileSetCreate().

1805 {
1806  File file;
1807 
1809 
1810  /*
1811  * Open the file. Note: we don't use O_EXCL, in case there is an orphaned
1812  * temp file that can be reused.
1813  */
1814  file = PathNameOpenFile(path, O_RDWR | O_CREAT | O_TRUNC | PG_BINARY);
1815  if (file <= 0)
1816  {
1817  if (error_on_failure)
1818  ereport(ERROR,
1820  errmsg("could not create temporary file \"%s\": %m",
1821  path)));
1822  else
1823  return file;
1824  }
1825 
1826  /* Mark it for temp_file_limit accounting. */
1828 
1829  /* Register it for automatic close. */
1830  RegisterTemporaryFile(file);
1831 
1832  return file;
1833 }
File PathNameOpenFile(const char *fileName, int fileFlags)
Definition: fd.c:1528
#define FD_TEMP_FILE_LIMIT
Definition: fd.c:190
ResourceOwner CurrentResourceOwner
Definition: resowner.c:146
static Vfd * VfdCache
Definition: fd.c:212
#define PG_BINARY
Definition: c.h:1271
#define ERROR
Definition: elog.h:46
int errcode_for_file_access(void)
Definition: elog.c:721
unsigned short fdstate
Definition: fd.c:195
#define ereport(elevel,...)
Definition: elog.h:157
static void RegisterTemporaryFile(File file)
Definition: fd.c:1500
int errmsg(const char *fmt,...)
Definition: elog.c:909
void ResourceOwnerEnlargeFiles(ResourceOwner owner)
Definition: resowner.c:1286
int File
Definition: fd.h:54

◆ PathNameDeleteTemporaryDir()

void PathNameDeleteTemporaryDir ( const char *  name)

Definition at line 1636 of file fd.c.

References LOG, stat, unlink_if_exists_fname(), and walkdir().

Referenced by SharedFileSetDeleteAll().

1637 {
1638  struct stat statbuf;
1639 
1640  /* Silently ignore missing directory. */
1641  if (stat(dirname, &statbuf) != 0 && errno == ENOENT)
1642  return;
1643 
1644  /*
1645  * Currently, walkdir doesn't offer a way for our passed in function to
1646  * maintain state. Perhaps it should, so that we could tell the caller
1647  * whether this operation succeeded or failed. Since this operation is
1648  * used in a cleanup path, we wouldn't actually behave differently: we'll
1649  * just log failures.
1650  */
1651  walkdir(dirname, unlink_if_exists_fname, false, LOG);
1652 }
static void walkdir(const char *path, void(*action)(const char *fname, bool isdir, int elevel), bool process_symlinks, int elevel)
Definition: fd.c:3486
#define LOG
Definition: elog.h:26
static void unlink_if_exists_fname(const char *fname, bool isdir, int elevel)
Definition: fd.c:3594
#define stat
Definition: win32_port.h:275

◆ PathNameDeleteTemporaryFile()

bool PathNameDeleteTemporaryFile ( const char *  name,
bool  error_on_failure 
)

Definition at line 1871 of file fd.c.

References ereport, errcode_for_file_access(), errmsg(), ERROR, LOG, ReportTemporaryFileUsage(), stat::st_size, and stat.

Referenced by SharedFileSetDelete(), and unlink_if_exists_fname().

1872 {
1873  struct stat filestats;
1874  int stat_errno;
1875 
1876  /* Get the final size for pgstat reporting. */
1877  if (stat(path, &filestats) != 0)
1878  stat_errno = errno;
1879  else
1880  stat_errno = 0;
1881 
1882  /*
1883  * Unlike FileClose's automatic file deletion code, we tolerate
1884  * non-existence to support BufFileDeleteShared which doesn't know how
1885  * many segments it has to delete until it runs out.
1886  */
1887  if (stat_errno == ENOENT)
1888  return false;
1889 
1890  if (unlink(path) < 0)
1891  {
1892  if (errno != ENOENT)
1893  ereport(error_on_failure ? ERROR : LOG,
1895  errmsg("could not unlink temporary file \"%s\": %m",
1896  path)));
1897  return false;
1898  }
1899 
1900  if (stat_errno == 0)
1901  ReportTemporaryFileUsage(path, filestats.st_size);
1902  else
1903  {
1904  errno = stat_errno;
1905  ereport(LOG,
1907  errmsg("could not stat file \"%s\": %m", path)));
1908  }
1909 
1910  return true;
1911 }
#define LOG
Definition: elog.h:26
#define ERROR
Definition: elog.h:46
int errcode_for_file_access(void)
Definition: elog.c:721
static void ReportTemporaryFileUsage(const char *path, off_t size)
Definition: fd.c:1481
#define ereport(elevel,...)
Definition: elog.h:157
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define stat
Definition: win32_port.h:275

◆ PathNameOpenFile()

File PathNameOpenFile ( const char *  fileName,
int  fileFlags 
)

Definition at line 1528 of file fd.c.

References PathNameOpenFilePerm(), and pg_file_create_mode.

Referenced by _mdfd_openseg(), logical_rewrite_log_mapping(), mdcreate(), mdopenfork(), mdsyncfiletag(), OpenTemporaryFileInTablespace(), PathNameCreateTemporaryFile(), PathNameOpenTemporaryFile(), and ReorderBufferRestoreChanges().

1529 {
1530  return PathNameOpenFilePerm(fileName, fileFlags, pg_file_create_mode);
1531 }
File PathNameOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode)
Definition: fd.c:1541
int pg_file_create_mode
Definition: file_perm.c:19

◆ PathNameOpenFilePerm()

File PathNameOpenFilePerm ( const char *  fileName,
int  fileFlags,
mode_t  fileMode 
)

Definition at line 1541 of file fd.c.

References AllocateVfd(), BasicOpenFilePerm(), DO_DB, elog, ereport, errcode(), errmsg(), ERROR, vfd::fd, vfd::fdstate, vfd::fileFlags, vfd::fileMode, vfd::fileName, vfd::fileSize, free, FreeVfd(), Insert(), LOG, nfile, ReleaseLruFiles(), and vfd::resowner.

Referenced by PathNameOpenFile().

1542 {
1543  char *fnamecopy;
1544  File file;
1545  Vfd *vfdP;
1546 
1547  DO_DB(elog(LOG, "PathNameOpenFilePerm: %s %x %o",
1548  fileName, fileFlags, fileMode));
1549 
1550  /*
1551  * We need a malloc'd copy of the file name; fail cleanly if no room.
1552  */
1553  fnamecopy = strdup(fileName);
1554  if (fnamecopy == NULL)
1555  ereport(ERROR,
1556  (errcode(ERRCODE_OUT_OF_MEMORY),
1557  errmsg("out of memory")));
1558 
1559  file = AllocateVfd();
1560  vfdP = &VfdCache[file];
1561 
1562  /* Close excess kernel FDs. */
1563  ReleaseLruFiles();
1564 
1565  vfdP->fd = BasicOpenFilePerm(fileName, fileFlags, fileMode);
1566 
1567  if (vfdP->fd < 0)
1568  {
1569  int save_errno = errno;
1570 
1571  FreeVfd(file);
1572  free(fnamecopy);
1573  errno = save_errno;
1574  return -1;
1575  }
1576  ++nfile;
1577  DO_DB(elog(LOG, "PathNameOpenFile: success %d",
1578  vfdP->fd));
1579 
1580  vfdP->fileName = fnamecopy;
1581  /* Saved flags are adjusted to be OK for re-opening file */
1582  vfdP->fileFlags = fileFlags & ~(O_CREAT | O_TRUNC | O_EXCL);
1583  vfdP->fileMode = fileMode;
1584  vfdP->fileSize = 0;
1585  vfdP->fdstate = 0x0;
1586  vfdP->resowner = NULL;
1587 
1588  Insert(file);
1589 
1590  return file;
1591 }
#define DO_DB(A)
Definition: fd.c:176
static Vfd * VfdCache
Definition: fd.c:212
int errcode(int sqlerrcode)
Definition: elog.c:698
#define LOG
Definition: elog.h:26
mode_t fileMode
Definition: fd.c:204
#define ERROR
Definition: elog.h:46
char * fileName
Definition: fd.c:201
static int nfile
Definition: fd.c:218
static File AllocateVfd(void)
Definition: fd.c:1367
unsigned short fdstate
Definition: fd.c:195
Definition: fd.c:192
off_t fileSize
Definition: fd.c:200
int fd
Definition: fd.c:194
static void Insert(File file)
Definition: fd.c:1266
ResourceOwner resowner
Definition: fd.c:196
static void ReleaseLruFiles(void)
Definition: fd.c:1357
#define ereport(elevel,...)
Definition: elog.h:157
#define free(a)
Definition: header.h:65
int errmsg(const char *fmt,...)
Definition: elog.c:909
int BasicOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode)
Definition: fd.c:1055
#define elog(elevel,...)
Definition: elog.h:232
static void FreeVfd(File file)
Definition: fd.c:1425
int fileFlags
Definition: fd.c:203
int File
Definition: fd.h:54

◆ PathNameOpenTemporaryFile()

File PathNameOpenTemporaryFile ( const char *  path,
int  mode 
)

Definition at line 1842 of file fd.c.

References CurrentResourceOwner, ereport, errcode_for_file_access(), errmsg(), ERROR, PathNameOpenFile(), PG_BINARY, RegisterTemporaryFile(), and ResourceOwnerEnlargeFiles().

Referenced by SharedFileSetOpen().

1843 {
1844  File file;
1845 
1847 
1848  file = PathNameOpenFile(path, mode | PG_BINARY);
1849 
1850  /* If no such file, then we don't raise an error. */
1851  if (file <= 0 && errno != ENOENT)
1852  ereport(ERROR,
1854  errmsg("could not open temporary file \"%s\": %m",
1855  path)));
1856 
1857  if (file > 0)
1858  {
1859  /* Register it for automatic close. */
1860  RegisterTemporaryFile(file);
1861  }
1862 
1863  return file;
1864 }
static PgChecksumMode mode
Definition: pg_checksums.c:63
File PathNameOpenFile(const char *fileName, int fileFlags)
Definition: fd.c:1528
ResourceOwner CurrentResourceOwner
Definition: resowner.c:146
#define PG_BINARY
Definition: c.h:1271
#define ERROR
Definition: elog.h:46
int errcode_for_file_access(void)
Definition: elog.c:721
#define ereport(elevel,...)
Definition: elog.h:157
static void RegisterTemporaryFile(File file)
Definition: fd.c:1500
int errmsg(const char *fmt,...)
Definition: elog.c:909
void ResourceOwnerEnlargeFiles(ResourceOwner owner)
Definition: resowner.c:1286
int File
Definition: fd.h:54

◆ pg_fdatasync()

int pg_fdatasync ( int  fd)

Definition at line 442 of file fd.c.

References enableFsync, and fsync.

Referenced by issue_xlog_fsync().

443 {
444  if (enableFsync)
445  {
446 #ifdef HAVE_FDATASYNC
447  return fdatasync(fd);
448 #else
449  return fsync(fd);
450 #endif
451  }
452  else
453  return 0;
454 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define fsync(fd)
Definition: win32_port.h:68
bool enableFsync
Definition: globals.c:122

◆ pg_flush_data()

void pg_flush_data ( int  fd,
off_t  offset,
off_t  amount 
)

Definition at line 462 of file fd.c.

References data_sync_elevel(), elevel, enableFsync, ereport, errcode_for_file_access(), errmsg(), FATAL, MAP_FAILED, and WARNING.

Referenced by copy_file(), FileWriteback(), and walkdir().

463 {
464  /*
465  * Right now file flushing is primarily used to avoid making later
466  * fsync()/fdatasync() calls have less impact. Thus don't trigger flushes
467  * if fsyncs are disabled - that's a decision we might want to make
468  * configurable at some point.
469  */
470  if (!enableFsync)
471  return;
472 
473  /*
474  * We compile all alternatives that are supported on the current platform,
475  * to find portability problems more easily.
476  */
477 #if defined(HAVE_SYNC_FILE_RANGE)
478  {
479  int rc;
480  static bool not_implemented_by_kernel = false;
481 
482  if (not_implemented_by_kernel)
483  return;
484 
485  /*
486  * sync_file_range(SYNC_FILE_RANGE_WRITE), currently linux specific,
487  * tells the OS that writeback for the specified blocks should be
488  * started, but that we don't want to wait for completion. Note that
489  * this call might block if too much dirty data exists in the range.
490  * This is the preferable method on OSs supporting it, as it works
491  * reliably when available (contrast to msync()) and doesn't flush out
492  * clean data (like FADV_DONTNEED).
493  */
494  rc = sync_file_range(fd, offset, nbytes,
495  SYNC_FILE_RANGE_WRITE);
496  if (rc != 0)
497  {
498  int elevel;
499 
500  /*
501  * For systems that don't have an implementation of
502  * sync_file_range() such as Windows WSL, generate only one
503  * warning and then suppress all further attempts by this process.
504  */
505  if (errno == ENOSYS)
506  {
507  elevel = WARNING;
508  not_implemented_by_kernel = true;
509  }
510  else
511  elevel = data_sync_elevel(WARNING);
512 
513  ereport(elevel,
515  errmsg("could not flush dirty data: %m")));
516  }
517 
518  return;
519  }
520 #endif
521 #if !defined(WIN32) && defined(MS_ASYNC)
522  {
523  void *p;
524  static int pagesize = 0;
525 
526  /*
527  * On several OSs msync(MS_ASYNC) on a mmap'ed file triggers
528  * writeback. On linux it only does so if MS_SYNC is specified, but
529  * then it does the writeback synchronously. Luckily all common linux
530  * systems have sync_file_range(). This is preferable over
531  * FADV_DONTNEED because it doesn't flush out clean data.
532  *
533  * We map the file (mmap()), tell the kernel to sync back the contents
534  * (msync()), and then remove the mapping again (munmap()).
535  */
536 
537  /* mmap() needs actual length if we want to map whole file */
538  if (offset == 0 && nbytes == 0)
539  {
540  nbytes = lseek(fd, 0, SEEK_END);
541  if (nbytes < 0)
542  {
545  errmsg("could not determine dirty data size: %m")));
546  return;
547  }
548  }
549 
550  /*
551  * Some platforms reject partial-page mmap() attempts. To deal with
552  * that, just truncate the request to a page boundary. If any extra
553  * bytes don't get flushed, well, it's only a hint anyway.
554  */
555 
556  /* fetch pagesize only once */
557  if (pagesize == 0)
558  pagesize = sysconf(_SC_PAGESIZE);
559 
560  /* align length to pagesize, dropping any fractional page */
561  if (pagesize > 0)
562  nbytes = (nbytes / pagesize) * pagesize;
563 
564  /* fractional-page request is a no-op */
565  if (nbytes <= 0)
566  return;
567 
568  /*
569  * mmap could well fail, particularly on 32-bit platforms where there
570  * may simply not be enough address space. If so, silently fall
571  * through to the next implementation.
572  */
573  if (nbytes <= (off_t) SSIZE_MAX)
574  p = mmap(NULL, nbytes, PROT_READ, MAP_SHARED, fd, offset);
575  else
576  p = MAP_FAILED;
577 
578  if (p != MAP_FAILED)
579  {
580  int rc;
581 
582  rc = msync(p, (size_t) nbytes, MS_ASYNC);
583  if (rc != 0)
584  {
587  errmsg("could not flush dirty data: %m")));
588  /* NB: need to fall through to munmap()! */
589  }
590 
591  rc = munmap(p, (size_t) nbytes);
592  if (rc != 0)
593  {
594  /* FATAL error because mapping would remain */
595  ereport(FATAL,
597  errmsg("could not munmap() while flushing data: %m")));
598  }
599 
600  return;
601  }
602  }
603 #endif
604 #if defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
605  {
606  int rc;
607 
608  /*
609  * Signal the kernel that the passed in range should not be cached
610  * anymore. This has the, desired, side effect of writing out dirty
611  * data, and the, undesired, side effect of likely discarding useful
612  * clean cached blocks. For the latter reason this is the least
613  * preferable method.
614  */
615 
616  rc = posix_fadvise(fd, offset, nbytes, POSIX_FADV_DONTNEED);
617 
618  if (rc != 0)
619  {
620  /* don't error out, this is just a performance optimization */
623  errmsg("could not flush dirty data: %m")));
624  }
625 
626  return;
627  }
628 #endif
629 }
#define MAP_FAILED
Definition: mem.h:45
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define FATAL
Definition: elog.h:49
int errcode_for_file_access(void)
Definition: elog.c:721
#define WARNING
Definition: elog.h:40
static int elevel
Definition: vacuumlazy.c:403
int data_sync_elevel(int elevel)
Definition: fd.c:3758
#define ereport(elevel,...)
Definition: elog.h:157
bool enableFsync
Definition: globals.c:122
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ pg_fsync()

int pg_fsync ( int  fd)

Definition at line 352 of file fd.c.

References Assert, fstat, pg_fsync_no_writethrough(), pg_fsync_writethrough(), S_ISDIR, stat::st_mode, sync_method, and SYNC_METHOD_FSYNC_WRITETHROUGH.

Referenced by AddToDataDirLockFile(), assign_xlog_sync_method(), BootStrapXLOG(), CheckPointLogicalRewriteHeap(), CreateLockFile(), do_pg_start_backup(), durable_rename(), FileSync(), fsync_fname_ext(), heap_xlog_logical_rewrite(), readRecoverySignalFile(), RecreateTwoPhaseFile(), RestoreSlotFromDisk(), SaveSlotToPath(), SlruPhysicalWritePage(), SlruSyncFileTag(), SnapBuildSerialize(), update_controlfile(), write_auto_conf_file(), write_relmap_file(), WriteControlFile(), writeTimeLineHistory(), writeTimeLineHistoryFile(), XLogFileCopy(), and XLogFileInitInternal().

353 {
354 #if !defined(WIN32) && defined(USE_ASSERT_CHECKING)
355  struct stat st;
356 
357  /*
358  * Some operating system implementations of fsync() have requirements
359  * about the file access modes that were used when their file descriptor
360  * argument was opened, and these requirements differ depending on whether
361  * the file descriptor is for a directory.
362  *
363  * For any file descriptor that may eventually be handed to fsync(), we
364  * should have opened it with access modes that are compatible with
365  * fsync() on all supported systems, otherwise the code may not be
366  * portable, even if it runs ok on the current system.
367  *
368  * We assert here that a descriptor for a file was opened with write
369  * permissions (either O_RDWR or O_WRONLY) and for a directory without
370  * write permissions (O_RDONLY).
371  *
372  * Ignore any fstat errors and let the follow-up fsync() do its work.
373  * Doing this sanity check here counts for the case where fsync() is
374  * disabled.
375  */
376  if (fstat(fd, &st) == 0)
377  {
378  int desc_flags = fcntl(fd, F_GETFL);
379 
380  /*
381  * O_RDONLY is historically 0, so just make sure that for directories
382  * no write flags are used.
383  */
384  if (S_ISDIR(st.st_mode))
385  Assert((desc_flags & (O_RDWR | O_WRONLY)) == 0);
386  else
387  Assert((desc_flags & (O_RDWR | O_WRONLY)) != 0);
388  }
389  errno = 0;
390 #endif
391 
392  /* #if is to skip the sync_method test if there's no need for it */
393 #if defined(HAVE_FSYNC_WRITETHROUGH) && !defined(FSYNC_WRITETHROUGH_IS_FSYNC)
395  return pg_fsync_writethrough(fd);
396  else
397 #endif
399 }
#define SYNC_METHOD_FSYNC_WRITETHROUGH
Definition: xlog.h:28
int pg_fsync_writethrough(int fd)
Definition: fd.c:419
int pg_fsync_no_writethrough(int fd)
Definition: fd.c:407
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define fstat
Definition: win32_port.h:274
#define Assert(condition)
Definition: c.h:804
int sync_method
Definition: xlog.c:107
#define S_ISDIR(m)
Definition: win32_port.h:316

◆ pg_fsync_no_writethrough()

int pg_fsync_no_writethrough ( int  fd)

Definition at line 407 of file fd.c.

References enableFsync, and fsync.

Referenced by issue_xlog_fsync(), and pg_fsync().

408 {
409  if (enableFsync)
410  return fsync(fd);
411  else
412  return 0;
413 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define fsync(fd)
Definition: win32_port.h:68
bool enableFsync
Definition: globals.c:122

◆ pg_fsync_writethrough()

int pg_fsync_writethrough ( int  fd)

Definition at line 419 of file fd.c.

References enableFsync.

Referenced by issue_xlog_fsync(), pg_fsync(), signal_cleanup(), and test_sync().

420 {
421  if (enableFsync)
422  {
423 #ifdef WIN32
424  return _commit(fd);
425 #elif defined(F_FULLFSYNC)
426  return (fcntl(fd, F_FULLFSYNC, 0) == -1) ? -1 : 0;
427 #else
428  errno = ENOSYS;
429  return -1;
430 #endif
431  }
432  else
433  return 0;
434 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
bool enableFsync
Definition: globals.c:122

◆ pg_pwritev_with_retry()

ssize_t pg_pwritev_with_retry ( int  fd,
const struct iovec iov,
int  iovcnt,
off_t  offset 
)

Definition at line 3768 of file fd.c.

References Assert, iovec::iov_base, iovec::iov_len, Min, and pg_pwritev().

Referenced by XLogFileInitInternal().

3769 {
3770  struct iovec iov_copy[PG_IOV_MAX];
3771  ssize_t sum = 0;
3772  ssize_t part;
3773 
3774  /* We'd better have space to make a copy, in case we need to retry. */
3775  if (iovcnt > PG_IOV_MAX)
3776  {
3777  errno = EINVAL;
3778  return -1;
3779  }
3780 
3781  for (;;)
3782  {
3783  /* Write as much as we can. */
3784  part = pg_pwritev(fd, iov, iovcnt, offset);
3785  if (part < 0)
3786  return -1;
3787 
3788 #ifdef SIMULATE_SHORT_WRITE
3789  part = Min(part, 4096);
3790 #endif
3791 
3792  /* Count our progress. */
3793  sum += part;
3794  offset += part;
3795 
3796  /* Step over iovecs that are done. */
3797  while (iovcnt > 0 && iov->iov_len <= part)
3798  {
3799  part -= iov->iov_len;
3800  ++iov;
3801  --iovcnt;
3802  }
3803 
3804  /* Are they all done? */
3805  if (iovcnt == 0)
3806  {
3807  /* We don't expect the kernel to write more than requested. */
3808  Assert(part == 0);
3809  break;
3810  }
3811 
3812  /*
3813  * Move whatever's left to the front of our mutable copy and adjust
3814  * the leading iovec.
3815  */
3816  Assert(iovcnt > 0);
3817  memmove(iov_copy, iov, sizeof(*iov) * iovcnt);
3818  Assert(iov->iov_len > part);
3819  iov_copy[0].iov_base = (char *) iov_copy[0].iov_base + part;
3820  iov_copy[0].iov_len -= part;
3821  iov = iov_copy;
3822  }
3823 
3824  return sum;
3825 }
size_t iov_len
Definition: pg_iovec.h:27
void * iov_base
Definition: pg_iovec.h:26
#define Min(x, y)
Definition: c.h:986
static int fd(const char *x, int i)
Definition: preproc-init.c:105
ssize_t pg_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset)
Definition: pwritev.c:29
#define PG_IOV_MAX
Definition: pg_iovec.h:40
Definition: pg_iovec.h:24
#define Assert(condition)
Definition: c.h:804

◆ pg_truncate()

int pg_truncate ( const char *  path,
off_t  length 
)

Definition at line 635 of file fd.c.

References CloseTransientFile(), vfd::fd, ftruncate, OpenTransientFile(), and PG_BINARY.

Referenced by do_truncate().

636 {
637 #ifdef WIN32
638  int save_errno;
639  int ret;
640  int fd;
641 
642  fd = OpenTransientFile(path, O_RDWR | PG_BINARY);
643  if (fd >= 0)
644  {
645  ret = ftruncate(fd, 0);
646  save_errno = errno;
647  CloseTransientFile(fd);
648  errno = save_errno;
649  }
650  else
651  ret = -1;
652 
653  return ret;
654 #else
655  return truncate(path, length);
656 #endif
657 }
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define PG_BINARY
Definition: c.h:1271
int OpenTransientFile(const char *fileName, int fileFlags)
Definition: fd.c:2467
int CloseTransientFile(int fd)
Definition: fd.c:2644
#define ftruncate(a, b)
Definition: win32_port.h:65

◆ ReadDir()

◆ ReadDirExtended()

struct dirent* ReadDirExtended ( DIR dir,
const char *  dirname,
int  elevel 
)

Definition at line 2759 of file fd.c.

References ereport, errcode_for_file_access(), errmsg(), and readdir().

Referenced by DeleteAllExportedSnapshotFiles(), ReadDir(), RelationCacheInitFileRemove(), RelationCacheInitFileRemoveInDir(), RemovePgTempFiles(), RemovePgTempFilesInDir(), RemovePgTempRelationFiles(), RemovePgTempRelationFilesInDbspace(), ReorderBufferCleanupSerializedTXNs(), scan_directory_ci(), SyncDataDirectory(), and walkdir().

2760 {
2761  struct dirent *dent;
2762 
2763  /* Give a generic message for AllocateDir failure, if caller didn't */
2764  if (dir == NULL)
2765  {
2766  ereport(elevel,
2768  errmsg("could not open directory \"%s\": %m",
2769  dirname)));
2770  return NULL;
2771  }
2772 
2773  errno = 0;
2774  if ((dent = readdir(dir)) != NULL)
2775  return dent;
2776 
2777  if (errno)
2778  ereport(elevel,
2780  errmsg("could not read directory \"%s\": %m",
2781  dirname)));
2782  return NULL;
2783 }
Definition: dirent.h:9
int errcode_for_file_access(void)
Definition: elog.c:721
static int elevel
Definition: vacuumlazy.c:403
#define ereport(elevel,...)
Definition: elog.h:157
struct dirent * readdir(DIR *)
Definition: dirent.c:78
int errmsg(const char *fmt,...)
Definition: elog.c:909

◆ ReleaseExternalFD()

◆ RemovePgTempFiles()

void RemovePgTempFiles ( void  )

Definition at line 3103 of file fd.c.

References AllocateDir(), dirent::d_name, FreeDir(), LOG, MAXPGPATH, PG_TEMP_FILES_DIR, ReadDirExtended(), RemovePgTempFilesInDir(), RemovePgTempRelationFiles(), snprintf, and TABLESPACE_VERSION_DIRECTORY.

Referenced by PostmasterMain(), and PostmasterStateMachine().

3104 {
3105  char temp_path[MAXPGPATH + 10 + sizeof(TABLESPACE_VERSION_DIRECTORY) + sizeof(PG_TEMP_FILES_DIR)];
3106  DIR *spc_dir;
3107  struct dirent *spc_de;
3108 
3109  /*
3110  * First process temp files in pg_default ($PGDATA/base)
3111  */
3112  snprintf(temp_path, sizeof(temp_path), "base/%s", PG_TEMP_FILES_DIR);
3113  RemovePgTempFilesInDir(temp_path, true, false);
3114  RemovePgTempRelationFiles("base");
3115 
3116  /*
3117  * Cycle through temp directories for all non-default tablespaces.
3118  */
3119  spc_dir = AllocateDir("pg_tblspc");
3120 
3121  while ((spc_de = ReadDirExtended(spc_dir, "pg_tblspc", LOG)) != NULL)
3122  {
3123  if (strcmp(spc_de->d_name, ".") == 0 ||
3124  strcmp(spc_de->d_name, "..") == 0)
3125  continue;
3126 
3127  snprintf(temp_path, sizeof(temp_path), "pg_tblspc/%s/%s/%s",
3129  RemovePgTempFilesInDir(temp_path, true, false);
3130 
3131  snprintf(temp_path, sizeof(temp_path), "pg_tblspc/%s/%s",
3133  RemovePgTempRelationFiles(temp_path);
3134  }
3135 
3136  FreeDir(spc_dir);
3137 
3138  /*
3139  * In EXEC_BACKEND case there is a pgsql_tmp directory at the top level of
3140  * DataDir as well. However, that is *not* cleaned here because doing so
3141  * would create a race condition. It's done separately, earlier in
3142  * postmaster startup.
3143  */
3144 }
struct dirent * ReadDirExtended(DIR *dir, const char *dirname, int elevel)
Definition: fd.c:2759
#define PG_TEMP_FILES_DIR
Definition: pg_checksums.c:60
#define LOG
Definition: elog.h:26
Definition: dirent.h:9
static void RemovePgTempRelationFiles(const char *tsdirname)
Definition: fd.c:3228
Definition: dirent.c:25
#define MAXPGPATH
#define TABLESPACE_VERSION_DIRECTORY
Definition: relpath.h:26
void RemovePgTempFilesInDir(const char *tmpdirname, bool missing_ok, bool unlink_all)
Definition: fd.c:3162
DIR * AllocateDir(const char *dirname)
Definition: fd.c:2678
char d_name[MAX_PATH]
Definition: dirent.h:15
#define snprintf
Definition: port.h:216
int FreeDir(DIR *dir)
Definition: fd.c:2796

◆ RemovePgTempFilesInDir()

void RemovePgTempFilesInDir ( const char *  tmpdirname,
bool  missing_ok,
bool  unlink_all 
)

Definition at line 3162 of file fd.c.

References AllocateDir(), dirent::d_name, ereport, errcode_for_file_access(), errmsg(), FreeDir(), LOG, lstat, MAXPGPATH, PG_TEMP_FILE_PREFIX, ReadDirExtended(), RemovePgTempFilesInDir(), S_ISDIR, snprintf, and stat::st_mode.

Referenced by PostmasterMain(), RemovePgTempFiles(), and RemovePgTempFilesInDir().

3163 {
3164  DIR *temp_dir;
3165  struct dirent *temp_de;
3166  char rm_path[MAXPGPATH * 2];
3167 
3168  temp_dir = AllocateDir(tmpdirname);
3169 
3170  if (temp_dir == NULL && errno == ENOENT && missing_ok)
3171  return;
3172 
3173  while ((temp_de = ReadDirExtended(temp_dir, tmpdirname, LOG)) != NULL)
3174  {
3175  if (strcmp(temp_de->d_name, ".") == 0 ||
3176  strcmp(temp_de->d_name, "..") == 0)
3177  continue;
3178 
3179  snprintf(rm_path, sizeof(rm_path), "%s/%s",
3180  tmpdirname, temp_de->d_name);
3181 
3182  if (unlink_all ||
3183  strncmp(temp_de->d_name,
3185  strlen(PG_TEMP_FILE_PREFIX)) == 0)
3186  {
3187  struct stat statbuf;
3188 
3189  if (lstat(rm_path, &statbuf) < 0)
3190  {
3191  ereport(LOG,
3193  errmsg("could not stat file \"%s\": %m", rm_path)));
3194  continue;
3195  }
3196 
3197  if (S_ISDIR(statbuf.st_mode))
3198  {
3199  /* recursively remove contents, then directory itself */
3200  RemovePgTempFilesInDir(rm_path, false, true);
3201 
3202  if (rmdir(rm_path) < 0)
3203  ereport(LOG,
3205  errmsg("could not remove directory \"%s\": %m",
3206  rm_path)));
3207  }
3208  else
3209  {
3210  if (unlink(rm_path) < 0)
3211  ereport(LOG,
3213  errmsg("could not remove file \"%s\": %m",
3214  rm_path)));
3215  }
3216  }
3217  else
3218  ereport(LOG,
3219  (errmsg("unexpected file found in temporary-files directory: \"%s\"",
3220  rm_path)));
3221  }
3222 
3223  FreeDir(temp_dir);
3224 }
struct dirent * ReadDirExtended(DIR *dir, const char *dirname, int elevel)
Definition: fd.c:2759
#define LOG
Definition: elog.h:26
Definition: dirent.h:9
Definition: dirent.c:25
#define PG_TEMP_FILE_PREFIX
Definition: pg_checksums.c:61
#define MAXPGPATH
void RemovePgTempFilesInDir(const char *tmpdirname, bool missing_ok, bool unlink_all)
Definition: fd.c:3162
int errcode_for_file_access(void)
Definition: elog.c:721
DIR * AllocateDir(const char *dirname)
Definition: fd.c:2678
#define ereport(elevel,...)
Definition: elog.h:157
#define S_ISDIR(m)
Definition: win32_port.h:316
#define lstat(path, sb)
Definition: win32_port.h:276
int errmsg(const char *fmt,...)
Definition: elog.c:909
char d_name[MAX_PATH]
Definition: dirent.h:15
#define snprintf
Definition: port.h:216
int FreeDir(DIR *dir)
Definition: fd.c:2796

◆ ReserveExternalFD()

void ReserveExternalFD ( void  )

Definition at line 1174 of file fd.c.

References numExternalFDs, and ReleaseLruFiles().

Referenced by AcquireExternalFD(), BackendInitialize(), dsm_impl_op(), InitializeLatchSupport(), InitPostmasterDeathWatchHandle(), pgstat_init(), PostmasterMarkPIDForWorkerNotify(), and XLogWrite().

1175 {
1176  /*
1177  * Release VFDs if needed to stay safe. Because we do this before
1178  * incrementing numExternalFDs, the final state will be as desired, i.e.,
1179  * nfile + numAllocatedDescs + numExternalFDs <= max_safe_fds.
1180  */
1181  ReleaseLruFiles();
1182 
1183  numExternalFDs++;
1184 }
static int numExternalFDs
Definition: fd.c:265
static void ReleaseLruFiles(void)
Definition: fd.c:1357

◆ set_max_safe_fds()

void set_max_safe_fds ( void  )

Definition at line 990 of file fd.c.

References count_usable_fds(), DEBUG2, elog, ereport, errcode(), errdetail(), errmsg(), FATAL, FD_MINFREE, max_files_per_process, max_safe_fds, Min, and NUM_RESERVED_FDS.

Referenced by PostmasterMain().

991 {
992  int usable_fds;
993  int already_open;
994 
995  /*----------
996  * We want to set max_safe_fds to
997  * MIN(usable_fds, max_files_per_process - already_open)
998  * less the slop factor for files that are opened without consulting
999  * fd.c. This ensures that we won't exceed either max_files_per_process
1000  * or the experimentally-determined EMFILE limit.
1001  *----------
1002  */
1004  &usable_fds, &already_open);
1005 
1006  max_safe_fds = Min(usable_fds, max_files_per_process - already_open);
1007 
1008  /*
1009  * Take off the FDs reserved for system() etc.
1010  */
1012 
1013  /*
1014  * Make sure we still have enough to get by.
1015  */
1016  if (max_safe_fds < FD_MINFREE)
1017  ereport(FATAL,
1018  (errcode(ERRCODE_INSUFFICIENT_RESOURCES),
1019  errmsg("insufficient file descriptors available to start server process"),
1020  errdetail("System allows %d, we need at least %d.",
1023 
1024  elog(DEBUG2, "max_safe_fds = %d, usable_fds = %d, already_open = %d",
1025  max_safe_fds, usable_fds, already_open);
1026 }
static void count_usable_fds(int max_to_probe, int *usable_fds, int *already_open)
Definition: fd.c:906
#define NUM_RESERVED_FDS
Definition: fd.c:128
int max_safe_fds
Definition: fd.c:158
#define Min(x, y)
Definition: c.h:986
int errcode(int sqlerrcode)
Definition: elog.c:698
#define FATAL
Definition: elog.h:49
#define DEBUG2
Definition: elog.h:24
int errdetail(const char *fmt,...)
Definition: elog.c:1042
int max_files_per_process
Definition: fd.c:145
#define ereport(elevel,...)
Definition: elog.h:157
#define FD_MINFREE
Definition: fd.c:137
int errmsg(const char *fmt,...)
Definition: elog.c:909
#define elog(elevel,...)
Definition: elog.h:232

◆ SetTempTablespaces()

void SetTempTablespaces ( Oid tableSpaces,
int  numSpaces 
)

Definition at line 2884 of file fd.c.

References Assert, nextTempTableSpace, numTempTableSpaces, random(), and tempTableSpaces.

Referenced by assign_temp_tablespaces(), and PrepareTempTablespaces().

2885 {
2886  Assert(numSpaces >= 0);
2887  tempTableSpaces = tableSpaces;
2888  numTempTableSpaces = numSpaces;
2889 
2890  /*
2891  * Select a random starting point in the list. This is to minimize
2892  * conflicts between backends that are most likely sharing the same list
2893  * of temp tablespaces. Note that if we create multiple temp files in the
2894  * same transaction, we'll advance circularly through the list --- this
2895  * ensures that large temporary sort files are nicely spread across all
2896  * available tablespaces.
2897  */
2898  if (numSpaces > 1)
2899  nextTempTableSpace = random() % numSpaces;
2900  else
2901  nextTempTableSpace = 0;
2902 }
long random(void)
Definition: random.c:22
static int numTempTableSpaces
Definition: fd.c:280
static int nextTempTableSpace
Definition: fd.c:281
#define Assert(condition)
Definition: c.h:804
static Oid * tempTableSpaces
Definition: fd.c:279

◆ SyncDataDirectory()

void SyncDataDirectory ( void  )

Definition at line 3376 of file fd.c.

References AllocateDir(), dirent::d_name, datadir_fsync_fname(), DEBUG1, enableFsync, ereport, errcode_for_file_access(), errmsg(), FreeDir(), LOG, lstat, MAXPGPATH, pgwin32_is_junction(), ReadDirExtended(), recovery_init_sync_method, RECOVERY_INIT_SYNC_METHOD_SYNCFS, snprintf, stat::st_mode, and walkdir().

Referenced by StartupXLOG().

3377 {
3378  bool xlog_is_symlink;
3379 
3380  /* We can skip this whole thing if fsync is disabled. */
3381  if (!enableFsync)
3382  return;
3383 
3384  /*
3385  * If pg_wal is a symlink, we'll need to recurse into it separately,
3386  * because the first walkdir below will ignore it.
3387  */
3388  xlog_is_symlink = false;
3389 
3390 #ifndef WIN32
3391  {
3392  struct stat st;
3393 
3394  if (lstat("pg_wal", &st) < 0)
3395  ereport(LOG,
3397  errmsg("could not stat file \"%s\": %m",
3398  "pg_wal")));
3399  else if (S_ISLNK(st.st_mode))
3400  xlog_is_symlink = true;
3401  }
3402 #else
3403  if (pgwin32_is_junction("pg_wal"))
3404  xlog_is_symlink = true;
3405 #endif
3406 
3407 #ifdef HAVE_SYNCFS
3409  {
3410  DIR *dir;
3411  struct dirent *de;
3412 
3413  /*
3414  * On Linux, we don't have to open every single file one by one. We
3415  * can use syncfs() to sync whole filesystems. We only expect
3416  * filesystem boundaries to exist where we tolerate symlinks, namely
3417  * pg_wal and the tablespaces, so we call syncfs() for each of those
3418  * directories.
3419  */
3420 
3421  /* Sync the top level pgdata directory. */
3422  do_syncfs(".");
3423  /* If any tablespaces are configured, sync each of those. */
3424  dir = AllocateDir("pg_tblspc");
3425  while ((de = ReadDirExtended(dir, "pg_tblspc", LOG)))
3426  {
3427  char path[MAXPGPATH];
3428 
3429  if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0)
3430  continue;
3431 
3432  snprintf(path, MAXPGPATH, "pg_tblspc/%s", de->d_name);
3433  do_syncfs(path);
3434  }
3435  FreeDir(dir);
3436  /* If pg_wal is a symlink, process that too. */
3437  if (xlog_is_symlink)
3438  do_syncfs("pg_wal");
3439  return;
3440  }
3441 #endif /* !HAVE_SYNCFS */
3442 
3443  /*
3444  * If possible, hint to the kernel that we're soon going to fsync the data
3445  * directory and its contents. Errors in this step are even less
3446  * interesting than normal, so log them only at DEBUG1.
3447  */
3448 #ifdef PG_FLUSH_DATA_WORKS
3449  walkdir(".", pre_sync_fname, false, DEBUG1);
3450  if (xlog_is_symlink)
3451  walkdir("pg_wal", pre_sync_fname, false, DEBUG1);
3452  walkdir("pg_tblspc", pre_sync_fname, true, DEBUG1);
3453 #endif
3454 
3455  /*
3456  * Now we do the fsync()s in the same order.
3457  *
3458  * The main call ignores symlinks, so in addition to specially processing
3459  * pg_wal if it's a symlink, pg_tblspc has to be visited separately with
3460  * process_symlinks = true. Note that if there are any plain directories
3461  * in pg_tblspc, they'll get fsync'd twice. That's not an expected case
3462  * so we don't worry about optimizing it.
3463  */
3464  walkdir(".", datadir_fsync_fname, false, LOG);
3465  if (xlog_is_symlink)
3466  walkdir("pg_wal", datadir_fsync_fname, false, LOG);
3467  walkdir("pg_tblspc", datadir_fsync_fname, true, LOG);
3468 }
#define DEBUG1
Definition: elog.h:25
static void walkdir(const char *path, void(*action)(const char *fname, bool isdir, int elevel), bool process_symlinks, int elevel)
Definition: fd.c:3486
struct dirent * ReadDirExtended(DIR *dir, const char *dirname, int elevel)
Definition: fd.c:2759
#define LOG
Definition: elog.h:26
Definition: dirent.h:9
Definition: dirent.c:25
int recovery_init_sync_method
Definition: fd.c:164
#define MAXPGPATH
int errcode_for_file_access(void)
Definition: elog.c:721
DIR * AllocateDir(const char *dirname)
Definition: fd.c:2678
static void datadir_fsync_fname(const char *fname, bool isdir, int elevel)
Definition: fd.c:3584
#define ereport(elevel,...)
Definition: elog.h:157
#define lstat(path, sb)
Definition: win32_port.h:276
bool enableFsync
Definition: globals.c:122
int errmsg(const char *fmt,...)
Definition: elog.c:909
char d_name[MAX_PATH]
Definition: dirent.h:15
#define snprintf
Definition: port.h:216
int FreeDir(DIR *dir)
Definition: fd.c:2796
bool pgwin32_is_junction(const char *path)

◆ TempTablespacePath()

void TempTablespacePath ( char *  path,
Oid  tablespace 
)

Definition at line 1722 of file fd.c.

References InvalidOid, MAXPGPATH, PG_TEMP_FILES_DIR, snprintf, and TABLESPACE_VERSION_DIRECTORY.

Referenced by OpenTemporaryFileInTablespace(), pg_ls_tmpdir(), SharedFileSetCreate(), and SharedFileSetPath().

1723 {
1724  /*
1725  * Identify the tempfile directory for this tablespace.
1726  *
1727  * If someone tries to specify pg_global, use pg_default instead.
1728  */
1729  if (tablespace == InvalidOid ||
1730  tablespace == DEFAULTTABLESPACE_OID ||
1731  tablespace == GLOBALTABLESPACE_OID)
1732  snprintf(path, MAXPGPATH, "base/%s", PG_TEMP_FILES_DIR);
1733  else
1734  {
1735  /* All other tablespaces are accessed via symlinks */
1736  snprintf(path, MAXPGPATH, "pg_tblspc/%u/%s/%s",
1739  }
1740 }
#define PG_TEMP_FILES_DIR
Definition: pg_checksums.c:60
#define MAXPGPATH
#define TABLESPACE_VERSION_DIRECTORY
Definition: relpath.h:26
char * tablespace
Definition: pgbench.c:225
#define InvalidOid
Definition: postgres_ext.h:36
#define snprintf
Definition: port.h:216

◆ TempTablespacesAreSet()

bool TempTablespacesAreSet ( void  )

Definition at line 2912 of file fd.c.

References numTempTableSpaces.

Referenced by GetTempTablespaces(), and PrepareTempTablespaces().

2913 {
2914  return (numTempTableSpaces >= 0);
2915 }
static int numTempTableSpaces
Definition: fd.c:280

Variable Documentation

◆ data_sync_retry

PGDLLIMPORT bool data_sync_retry

Definition at line 161 of file fd.c.

Referenced by data_sync_elevel().

◆ max_files_per_process

PGDLLIMPORT int max_files_per_process

Definition at line 145 of file fd.c.

Referenced by set_max_safe_fds().

◆ max_safe_fds

◆ recovery_init_sync_method

int recovery_init_sync_method

Definition at line 164 of file fd.c.

Referenced by SyncDataDirectory().