PostgreSQL Source Code git master
Data Structures | Macros | Functions
buffile.c File Reference
#include "postgres.h"
#include "commands/tablespace.h"
#include "executor/instrument.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "storage/buffile.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "utils/resowner.h"
Include dependency graph for buffile.c:

Go to the source code of this file.

Data Structures

struct   BufFile
 

Macros

#define  MAX_PHYSICAL_FILESIZE   0x40000000
 
#define  BUFFILE_SEG_SIZE   (MAX_PHYSICAL_FILESIZE / BLCKSZ)
 

Functions

static BufFile *  makeBufFileCommon (int nfiles)
 
static BufFile *  makeBufFile (File firstfile)
 
static void  extendBufFile (BufFile *file)
 
static void  BufFileLoadBuffer (BufFile *file)
 
static void  BufFileDumpBuffer (BufFile *file)
 
static void  BufFileFlush (BufFile *file)
 
static File  MakeNewFileSetSegment (BufFile *buffile, int segment)
 
BufFile *  BufFileCreateTemp (bool interXact)
 
static void  FileSetSegmentName (char *name, const char *buffile_name, int segment)
 
BufFile *  BufFileCreateFileSet (FileSet *fileset, const char *name)
 
BufFile *  BufFileOpenFileSet (FileSet *fileset, const char *name, int mode, bool missing_ok)
 
void  BufFileDeleteFileSet (FileSet *fileset, const char *name, bool missing_ok)
 
void  BufFileExportFileSet (BufFile *file)
 
void  BufFileClose (BufFile *file)
 
static size_t  BufFileReadCommon (BufFile *file, void *ptr, size_t size, bool exact, bool eofOK)
 
size_t  BufFileRead (BufFile *file, void *ptr, size_t size)
 
void  BufFileReadExact (BufFile *file, void *ptr, size_t size)
 
size_t  BufFileReadMaybeEOF (BufFile *file, void *ptr, size_t size, bool eofOK)
 
void  BufFileWrite (BufFile *file, const void *ptr, size_t size)
 
int  BufFileSeek (BufFile *file, int fileno, off_t offset, int whence)
 
void  BufFileTell (BufFile *file, int *fileno, off_t *offset)
 
int  BufFileSeekBlock (BufFile *file, int64 blknum)
 
int64  BufFileSize (BufFile *file)
 
int64  BufFileAppend (BufFile *target, BufFile *source)
 
void  BufFileTruncateFileSet (BufFile *file, int fileno, off_t offset)
 

Macro Definition Documentation

◆ BUFFILE_SEG_SIZE

#define BUFFILE_SEG_SIZE   (MAX_PHYSICAL_FILESIZE / BLCKSZ)

Definition at line 63 of file buffile.c.

◆ MAX_PHYSICAL_FILESIZE

#define MAX_PHYSICAL_FILESIZE   0x40000000

Definition at line 62 of file buffile.c.

Function Documentation

◆ BufFileAppend()

int64 BufFileAppend ( BufFile *  target,
BufFile *  source 
)

Definition at line 902 of file buffile.c.

903{
904 int64 startBlock = (int64) target->numFiles * BUFFILE_SEG_SIZE;
905 int newNumFiles = target->numFiles + source->numFiles;
906 int i;
907
908 Assert(source->readOnly);
909 Assert(!source->dirty);
910
911 if (target->resowner != source->resowner)
912 elog(ERROR, "could not append BufFile with non-matching resource owner");
913
914 target->files = (File *)
915 repalloc(target->files, sizeof(File) * newNumFiles);
916 for (i = target->numFiles; i < newNumFiles; i++)
917 target->files[i] = source->files[i - target->numFiles];
918 target->numFiles = newNumFiles;
919
920 return startBlock;
921}
#define BUFFILE_SEG_SIZE
Definition: buffile.c:63
int64_t int64
Definition: c.h:535
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:226
int File
Definition: fd.h:51
Assert(PointerIsAligned(start, uint64))
i
int i
Definition: isn.c:77
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1610
static rewind_source * source
Definition: pg_rewind.c:89
int numFiles
Definition: buffile.c:72
File * files
Definition: buffile.c:74
ResourceOwner resowner
Definition: buffile.c:88

References Assert(), BUFFILE_SEG_SIZE, elog, ERROR, BufFile::files, i, BufFile::numFiles, repalloc(), BufFile::resowner, and source.

Referenced by LogicalTapeImport().

◆ BufFileClose()

void BufFileClose ( BufFile *  file )

Definition at line 412 of file buffile.c.

413{
414 int i;
415
416 /* flush any unwritten data */
417 BufFileFlush(file);
418 /* close and delete the underlying file(s) */
419 for (i = 0; i < file->numFiles; i++)
420 FileClose(file->files[i]);
421 /* release the buffer space */
422 pfree(file->files);
423 pfree(file);
424}
static void BufFileFlush(BufFile *file)
Definition: buffile.c:720
void FileClose(File file)
Definition: fd.c:1979
void pfree(void *pointer)
Definition: mcxt.c:1594

References BufFileFlush(), FileClose(), BufFile::files, i, BufFile::numFiles, and pfree().

Referenced by ensure_last_message(), ExecHashJoinNewBatch(), ExecHashTableDestroy(), gistFreeBuildBuffers(), LogicalTapeSetClose(), SendBackupManifest(), stream_abort_internal(), stream_close_file(), sts_end_parallel_scan(), sts_end_write(), sts_parallel_scan_next(), subxact_info_read(), subxact_info_write(), tuplestore_clear(), and tuplestore_end().

◆ BufFileCreateFileSet()

BufFile * BufFileCreateFileSet ( FileSet *  fileset,
const char *  name 
)

Definition at line 267 of file buffile.c.

268{
269 BufFile *file;
270
271 file = makeBufFileCommon(1);
272 file->fileset = fileset;
273 file->name = pstrdup(name);
274 file->files = (File *) palloc(sizeof(File));
275 file->files[0] = MakeNewFileSetSegment(file, 0);
276 file->readOnly = false;
277
278 return file;
279}
static BufFile * makeBufFileCommon(int nfiles)
Definition: buffile.c:118
static File MakeNewFileSetSegment(BufFile *buffile, int segment)
Definition: buffile.c:231
char * pstrdup(const char *in)
Definition: mcxt.c:1759
void * palloc(Size size)
Definition: mcxt.c:1365
Definition: buffile.c:71
FileSet * fileset
Definition: buffile.c:80
bool readOnly
Definition: buffile.c:78
const char * name
Definition: buffile.c:81
const char * name

References BufFile::files, BufFile::fileset, makeBufFileCommon(), MakeNewFileSetSegment(), BufFile::name, name, palloc(), pstrdup(), and BufFile::readOnly.

Referenced by LogicalTapeSetCreate(), stream_open_file(), sts_puttuple(), and subxact_info_write().

◆ BufFileCreateTemp()

BufFile * BufFileCreateTemp ( bool  interXact )

Definition at line 193 of file buffile.c.

194{
195 BufFile *file;
196 File pfile;
197
198 /*
199 * Ensure that temp tablespaces are set up for OpenTemporaryFile to use.
200 * Possibly the caller will have done this already, but it seems useful to
201 * double-check here. Failure to do this at all would result in the temp
202 * files always getting placed in the default tablespace, which is a
203 * pretty hard-to-detect bug. Callers may prefer to do it earlier if they
204 * want to be sure that any required catalog access is done in some other
205 * resource context.
206 */
208
209 pfile = OpenTemporaryFile(interXact);
210 Assert(pfile >= 0);
211
212 file = makeBufFile(pfile);
213 file->isInterXact = interXact;
214
215 return file;
216}
void PrepareTempTablespaces(void)
Definition: tablespace.c:1331
static BufFile * makeBufFile(File firstfile)
Definition: buffile.c:139
File OpenTemporaryFile(bool interXact)
Definition: fd.c:1725
bool isInterXact
Definition: buffile.c:76

References Assert(), BufFile::isInterXact, makeBufFile(), OpenTemporaryFile(), and PrepareTempTablespaces().

Referenced by ExecHashJoinSaveTuple(), gistInitBuildBuffers(), InitializeBackupManifest(), LogicalTapeSetCreate(), and tuplestore_puttuple_common().

◆ BufFileDeleteFileSet()

void BufFileDeleteFileSet ( FileSet *  fileset,
const char *  name,
bool  missing_ok 
)

Definition at line 364 of file buffile.c.

365{
366 char segment_name[MAXPGPATH];
367 int segment = 0;
368 bool found = false;
369
370 /*
371 * We don't know how many segments the file has. We'll keep deleting
372 * until we run out. If we don't manage to find even an initial segment,
373 * raise an error.
374 */
375 for (;;)
376 {
377 FileSetSegmentName(segment_name, name, segment);
378 if (!FileSetDelete(fileset, segment_name, true))
379 break;
380 found = true;
381 ++segment;
382
384 }
385
386 if (!found && !missing_ok)
387 elog(ERROR, "could not delete unknown BufFile \"%s\"", name);
388}
static void FileSetSegmentName(char *name, const char *buffile_name, int segment)
Definition: buffile.c:222
bool FileSetDelete(FileSet *fileset, const char *name, bool error_on_failure)
Definition: fileset.c:136
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:122
#define MAXPGPATH

References CHECK_FOR_INTERRUPTS, elog, ERROR, FileSetDelete(), FileSetSegmentName(), MAXPGPATH, and name.

Referenced by stream_cleanup_files(), and subxact_info_write().

◆ BufFileDumpBuffer()

static void BufFileDumpBuffer ( BufFile *  file )
static

Definition at line 494 of file buffile.c.

495{
496 int wpos = 0;
497 int bytestowrite;
498 File thisfile;
499
500 /*
501 * Unlike BufFileLoadBuffer, we must dump the whole buffer even if it
502 * crosses a component-file boundary; so we need a loop.
503 */
504 while (wpos < file->nbytes)
505 {
506 off_t availbytes;
507 instr_time io_start;
508 instr_time io_time;
509
510 /*
511 * Advance to next component file if necessary and possible.
512 */
513 if (file->curOffset >= MAX_PHYSICAL_FILESIZE)
514 {
515 while (file->curFile + 1 >= file->numFiles)
516 extendBufFile(file);
517 file->curFile++;
518 file->curOffset = 0;
519 }
520
521 /*
522 * Determine how much we need to write into this file.
523 */
524 bytestowrite = file->nbytes - wpos;
525 availbytes = MAX_PHYSICAL_FILESIZE - file->curOffset;
526
527 if ((off_t) bytestowrite > availbytes)
528 bytestowrite = (int) availbytes;
529
530 thisfile = file->files[file->curFile];
531
532 if (track_io_timing)
533 INSTR_TIME_SET_CURRENT(io_start);
534 else
535 INSTR_TIME_SET_ZERO(io_start);
536
537 bytestowrite = FileWrite(thisfile,
538 file->buffer.data + wpos,
539 bytestowrite,
540 file->curOffset,
541 WAIT_EVENT_BUFFILE_WRITE);
542 if (bytestowrite <= 0)
545 errmsg("could not write to file \"%s\": %m",
546 FilePathName(thisfile))));
547
548 if (track_io_timing)
549 {
550 INSTR_TIME_SET_CURRENT(io_time);
552 }
553
554 file->curOffset += bytestowrite;
555 wpos += bytestowrite;
556
558 }
559 file->dirty = false;
560
561 /*
562 * At this point, curOffset has been advanced to the end of the buffer,
563 * ie, its original value + nbytes. We need to make it point to the
564 * logical file position, ie, original value + pos, in case that is less
565 * (as could happen due to a small backwards seek in a dirty buffer!)
566 */
567 file->curOffset -= (file->nbytes - file->pos);
568 if (file->curOffset < 0) /* handle possible segment crossing */
569 {
570 file->curFile--;
571 Assert(file->curFile >= 0);
573 }
574
575 /*
576 * Now we can set the buffer empty without changing the logical position
577 */
578 file->pos = 0;
579 file->nbytes = 0;
580}
static void extendBufFile(BufFile *file)
Definition: buffile.c:156
#define MAX_PHYSICAL_FILESIZE
Definition: buffile.c:62
bool track_io_timing
Definition: bufmgr.c:147
int errcode_for_file_access(void)
Definition: elog.c:877
int errmsg(const char *fmt,...)
Definition: elog.c:1071
#define ereport(elevel,...)
Definition: elog.h:150
char * FilePathName(File file)
Definition: fd.c:2513
static ssize_t FileWrite(File file, const void *buffer, size_t amount, off_t offset, uint32 wait_event_info)
Definition: fd.h:211
#define INSTR_TIME_SET_CURRENT(t)
Definition: instr_time.h:122
#define INSTR_TIME_SET_ZERO(t)
Definition: instr_time.h:172
#define INSTR_TIME_ACCUM_DIFF(x, y, z)
Definition: instr_time.h:184
BufferUsage pgBufferUsage
Definition: instrument.c:20
int nbytes
Definition: buffile.c:97
PGAlignedBlock buffer
Definition: buffile.c:103
bool dirty
Definition: buffile.c:77
int pos
Definition: buffile.c:96
int curFile
Definition: buffile.c:94
off_t curOffset
Definition: buffile.c:95
instr_time temp_blk_write_time
Definition: instrument.h:41
int64 temp_blks_written
Definition: instrument.h:35
Definition: instr_time.h:70
#define wpos(wep)
Definition: tsrank.c:27
char data[BLCKSZ]
Definition: c.h:1118

References Assert(), BufFile::buffer, BufFile::curFile, BufFile::curOffset, PGAlignedBlock::data, BufFile::dirty, ereport, errcode_for_file_access(), errmsg(), ERROR, extendBufFile(), FilePathName(), BufFile::files, FileWrite(), INSTR_TIME_ACCUM_DIFF, INSTR_TIME_SET_CURRENT, INSTR_TIME_SET_ZERO, MAX_PHYSICAL_FILESIZE, BufFile::nbytes, BufFile::numFiles, pgBufferUsage, BufFile::pos, BufferUsage::temp_blk_write_time, BufferUsage::temp_blks_written, track_io_timing, and wpos.

Referenced by BufFileFlush(), and BufFileWrite().

◆ BufFileExportFileSet()

void BufFileExportFileSet ( BufFile *  file )

Definition at line 394 of file buffile.c.

395{
396 /* Must be a file belonging to a FileSet. */
397 Assert(file->fileset != NULL);
398
399 /* It's probably a bug if someone calls this twice. */
400 Assert(!file->readOnly);
401
402 BufFileFlush(file);
403 file->readOnly = true;
404}

References Assert(), BufFileFlush(), BufFile::fileset, and BufFile::readOnly.

Referenced by LogicalTapeFreeze().

◆ BufFileFlush()

static void BufFileFlush ( BufFile *  file )
static

Definition at line 720 of file buffile.c.

721{
722 if (file->dirty)
723 BufFileDumpBuffer(file);
724
725 Assert(!file->dirty);
726}
static void BufFileDumpBuffer(BufFile *file)
Definition: buffile.c:494

References Assert(), BufFileDumpBuffer(), and BufFile::dirty.

Referenced by BufFileClose(), BufFileExportFileSet(), BufFileReadCommon(), and BufFileSeek().

◆ BufFileLoadBuffer()

static void BufFileLoadBuffer ( BufFile *  file )
static

Definition at line 434 of file buffile.c.

435{
436 File thisfile;
437 instr_time io_start;
438 instr_time io_time;
439
440 /*
441 * Advance to next component file if necessary and possible.
442 */
443 if (file->curOffset >= MAX_PHYSICAL_FILESIZE &&
444 file->curFile + 1 < file->numFiles)
445 {
446 file->curFile++;
447 file->curOffset = 0;
448 }
449
450 thisfile = file->files[file->curFile];
451
452 if (track_io_timing)
453 INSTR_TIME_SET_CURRENT(io_start);
454 else
455 INSTR_TIME_SET_ZERO(io_start);
456
457 /*
458 * Read whatever we can get, up to a full bufferload.
459 */
460 file->nbytes = FileRead(thisfile,
461 file->buffer.data,
462 sizeof(file->buffer.data),
463 file->curOffset,
464 WAIT_EVENT_BUFFILE_READ);
465 if (file->nbytes < 0)
466 {
467 file->nbytes = 0;
470 errmsg("could not read file \"%s\": %m",
471 FilePathName(thisfile))));
472 }
473
474 if (track_io_timing)
475 {
476 INSTR_TIME_SET_CURRENT(io_time);
478 }
479
480 /* we choose not to advance curOffset here */
481
482 if (file->nbytes > 0)
484}
static ssize_t FileRead(File file, void *buffer, size_t amount, off_t offset, uint32 wait_event_info)
Definition: fd.h:199
instr_time temp_blk_read_time
Definition: instrument.h:40
int64 temp_blks_read
Definition: instrument.h:34

References BufFile::buffer, BufFile::curFile, BufFile::curOffset, PGAlignedBlock::data, ereport, errcode_for_file_access(), errmsg(), ERROR, FilePathName(), FileRead(), BufFile::files, INSTR_TIME_ACCUM_DIFF, INSTR_TIME_SET_CURRENT, INSTR_TIME_SET_ZERO, MAX_PHYSICAL_FILESIZE, BufFile::nbytes, BufFile::numFiles, pgBufferUsage, BufferUsage::temp_blk_read_time, BufferUsage::temp_blks_read, and track_io_timing.

Referenced by BufFileReadCommon().

◆ BufFileOpenFileSet()

BufFile * BufFileOpenFileSet ( FileSet *  fileset,
const char *  name,
int  mode,
bool  missing_ok 
)

Definition at line 291 of file buffile.c.

293{
294 BufFile *file;
295 char segment_name[MAXPGPATH];
296 Size capacity = 16;
297 File *files;
298 int nfiles = 0;
299
300 files = palloc(sizeof(File) * capacity);
301
302 /*
303 * We don't know how many segments there are, so we'll probe the
304 * filesystem to find out.
305 */
306 for (;;)
307 {
308 /* See if we need to expand our file segment array. */
309 if (nfiles + 1 > capacity)
310 {
311 capacity *= 2;
312 files = repalloc(files, sizeof(File) * capacity);
313 }
314 /* Try to load a segment. */
315 FileSetSegmentName(segment_name, name, nfiles);
316 files[nfiles] = FileSetOpen(fileset, segment_name, mode);
317 if (files[nfiles] <= 0)
318 break;
319 ++nfiles;
320
322 }
323
324 /*
325 * If we didn't find any files at all, then no BufFile exists with this
326 * name.
327 */
328 if (nfiles == 0)
329 {
330 /* free the memory */
331 pfree(files);
332
333 if (missing_ok)
334 return NULL;
335
338 errmsg("could not open temporary file \"%s\" from BufFile \"%s\": %m",
339 segment_name, name)));
340 }
341
342 file = makeBufFileCommon(nfiles);
343 file->files = files;
344 file->readOnly = (mode == O_RDONLY);
345 file->fileset = fileset;
346 file->name = pstrdup(name);
347
348 return file;
349}
size_t Size
Definition: c.h:610
File FileSetOpen(FileSet *fileset, const char *name, int mode)
Definition: fileset.c:119
static PgChecksumMode mode
Definition: pg_checksums.c:55

References CHECK_FOR_INTERRUPTS, ereport, errcode_for_file_access(), errmsg(), ERROR, BufFile::files, BufFile::fileset, FileSetOpen(), FileSetSegmentName(), makeBufFileCommon(), MAXPGPATH, mode, BufFile::name, name, palloc(), pfree(), pstrdup(), BufFile::readOnly, and repalloc().

Referenced by apply_spooled_messages(), ensure_last_message(), LogicalTapeImport(), stream_abort_internal(), stream_open_file(), sts_parallel_scan_next(), subxact_info_read(), and subxact_info_write().

◆ BufFileRead()

size_t BufFileRead ( BufFile *  file,
void *  ptr,
size_t  size 
)

Definition at line 645 of file buffile.c.

646{
647 return BufFileReadCommon(file, ptr, size, false, false);
648}
static size_t BufFileReadCommon(BufFile *file, void *ptr, size_t size, bool exact, bool eofOK)
Definition: buffile.c:593

References BufFileReadCommon().

◆ BufFileReadCommon()

static size_t BufFileReadCommon ( BufFile *  file,
void *  ptr,
size_t  size,
bool  exact,
bool  eofOK 
)
static

Definition at line 593 of file buffile.c.

594{
595 size_t start_size = size;
596 size_t nread = 0;
597 size_t nthistime;
598
599 BufFileFlush(file);
600
601 while (size > 0)
602 {
603 if (file->pos >= file->nbytes)
604 {
605 /* Try to load more data into buffer. */
606 file->curOffset += file->pos;
607 file->pos = 0;
608 file->nbytes = 0;
609 BufFileLoadBuffer(file);
610 if (file->nbytes <= 0)
611 break; /* no more data available */
612 }
613
614 nthistime = file->nbytes - file->pos;
615 if (nthistime > size)
616 nthistime = size;
617 Assert(nthistime > 0);
618
619 memcpy(ptr, file->buffer.data + file->pos, nthistime);
620
621 file->pos += nthistime;
622 ptr = (char *) ptr + nthistime;
623 size -= nthistime;
624 nread += nthistime;
625 }
626
627 if (exact &&
628 (nread != start_size && !(nread == 0 && eofOK)))
631 file->name ?
632 errmsg("could not read from file set \"%s\": read only %zu of %zu bytes",
633 file->name, nread, start_size) :
634 errmsg("could not read from temporary file: read only %zu of %zu bytes",
635 nread, start_size));
636
637 return nread;
638}
static void BufFileLoadBuffer(BufFile *file)
Definition: buffile.c:434

References Assert(), BufFile::buffer, BufFileFlush(), BufFileLoadBuffer(), BufFile::curOffset, PGAlignedBlock::data, ereport, errcode_for_file_access(), errmsg(), ERROR, BufFile::name, BufFile::nbytes, and BufFile::pos.

Referenced by BufFileRead(), BufFileReadExact(), and BufFileReadMaybeEOF().

◆ BufFileReadExact()

void BufFileReadExact ( BufFile *  file,
void *  ptr,
size_t  size 
)

Definition at line 654 of file buffile.c.

655{
656 BufFileReadCommon(file, ptr, size, true, false);
657}

References BufFileReadCommon().

Referenced by apply_spooled_messages(), ExecHashJoinGetSavedTuple(), ltsReadBlock(), ReadTempFileBlock(), readtup_heap(), SendBackupManifest(), sts_parallel_scan_next(), sts_read_tuple(), and subxact_info_read().

◆ BufFileReadMaybeEOF()

size_t BufFileReadMaybeEOF ( BufFile *  file,
void *  ptr,
size_t  size,
bool  eofOK 
)

Definition at line 664 of file buffile.c.

665{
666 return BufFileReadCommon(file, ptr, size, true, eofOK);
667}

References BufFileReadCommon().

Referenced by apply_spooled_messages(), ExecHashJoinGetSavedTuple(), and getlen().

◆ BufFileSeek()

int BufFileSeek ( BufFile *  file,
int  fileno,
off_t  offset,
int  whence 
)

Definition at line 740 of file buffile.c.

741{
742 int newFile;
743 off_t newOffset;
744
745 switch (whence)
746 {
747 case SEEK_SET:
748 if (fileno < 0)
749 return EOF;
750 newFile = fileno;
751 newOffset = offset;
752 break;
753 case SEEK_CUR:
754
755 /*
756 * Relative seek considers only the signed offset, ignoring
757 * fileno. Note that large offsets (> 1 GB) risk overflow in this
758 * add, unless we have 64-bit off_t.
759 */
760 newFile = file->curFile;
761 newOffset = (file->curOffset + file->pos) + offset;
762 break;
763 case SEEK_END:
764
765 /*
766 * The file size of the last file gives us the end offset of that
767 * file.
768 */
769 newFile = file->numFiles - 1;
770 newOffset = FileSize(file->files[file->numFiles - 1]);
771 if (newOffset < 0)
774 errmsg("could not determine size of temporary file \"%s\" from BufFile \"%s\": %m",
775 FilePathName(file->files[file->numFiles - 1]),
776 file->name)));
777 break;
778 default:
779 elog(ERROR, "invalid whence: %d", whence);
780 return EOF;
781 }
782 while (newOffset < 0)
783 {
784 if (--newFile < 0)
785 return EOF;
786 newOffset += MAX_PHYSICAL_FILESIZE;
787 }
788 if (newFile == file->curFile &&
789 newOffset >= file->curOffset &&
790 newOffset <= file->curOffset + file->nbytes)
791 {
792 /*
793 * Seek is to a point within existing buffer; we can just adjust
794 * pos-within-buffer, without flushing buffer. Note this is OK
795 * whether reading or writing, but buffer remains dirty if we were
796 * writing.
797 */
798 file->pos = (int) (newOffset - file->curOffset);
799 return 0;
800 }
801 /* Otherwise, must reposition buffer, so flush any dirty data */
802 BufFileFlush(file);
803
804 /*
805 * At this point and no sooner, check for seek past last segment. The
806 * above flush could have created a new segment, so checking sooner would
807 * not work (at least not with this code).
808 */
809
810 /* convert seek to "start of next seg" to "end of last seg" */
811 if (newFile == file->numFiles && newOffset == 0)
812 {
813 newFile--;
814 newOffset = MAX_PHYSICAL_FILESIZE;
815 }
816 while (newOffset > MAX_PHYSICAL_FILESIZE)
817 {
818 if (++newFile >= file->numFiles)
819 return EOF;
820 newOffset -= MAX_PHYSICAL_FILESIZE;
821 }
822 if (newFile >= file->numFiles)
823 return EOF;
824 /* Seek is OK! */
825 file->curFile = newFile;
826 file->curOffset = newOffset;
827 file->pos = 0;
828 file->nbytes = 0;
829 return 0;
830}
off_t FileSize(File file)
Definition: fd.c:2461

References BufFileFlush(), BufFile::curFile, BufFile::curOffset, elog, ereport, errcode_for_file_access(), errmsg(), ERROR, FilePathName(), BufFile::files, FileSize(), MAX_PHYSICAL_FILESIZE, BufFile::name, BufFile::nbytes, BufFile::numFiles, and BufFile::pos.

Referenced by BufFileSeekBlock(), ensure_last_message(), ExecHashJoinNewBatch(), SendBackupManifest(), stream_open_file(), tuplestore_copy_read_pointer(), tuplestore_gettuple(), tuplestore_puttuple_common(), tuplestore_rescan(), and tuplestore_select_read_pointer().

◆ BufFileSeekBlock()

int BufFileSeekBlock ( BufFile *  file,
int64  blknum 
)

Definition at line 851 of file buffile.c.

852{
853 return BufFileSeek(file,
854 (int) (blknum / BUFFILE_SEG_SIZE),
855 (off_t) (blknum % BUFFILE_SEG_SIZE) * BLCKSZ,
856 SEEK_SET);
857}
int BufFileSeek(BufFile *file, int fileno, off_t offset, int whence)
Definition: buffile.c:740

References BUFFILE_SEG_SIZE, and BufFileSeek().

Referenced by ltsReadBlock(), ltsWriteBlock(), ReadTempFileBlock(), sts_parallel_scan_next(), and WriteTempFileBlock().

◆ BufFileSize()

int64 BufFileSize ( BufFile *  file )

Definition at line 866 of file buffile.c.

867{
868 int64 lastFileSize;
869
870 /* Get the size of the last physical file. */
871 lastFileSize = FileSize(file->files[file->numFiles - 1]);
872 if (lastFileSize < 0)
875 errmsg("could not determine size of temporary file \"%s\" from BufFile \"%s\": %m",
876 FilePathName(file->files[file->numFiles - 1]),
877 file->name)));
878
879 return ((file->numFiles - 1) * (int64) MAX_PHYSICAL_FILESIZE) +
880 lastFileSize;
881}

References ereport, errcode_for_file_access(), errmsg(), ERROR, FilePathName(), BufFile::files, FileSize(), MAX_PHYSICAL_FILESIZE, BufFile::name, and BufFile::numFiles.

Referenced by LogicalTapeImport(), and tuplestore_updatemax().

◆ BufFileTell()

void BufFileTell ( BufFile *  file,
int *  fileno,
off_t *  offset 
)

Definition at line 833 of file buffile.c.

834{
835 *fileno = file->curFile;
836 *offset = file->curOffset + file->pos;
837}

References BufFile::curFile, BufFile::curOffset, and BufFile::pos.

Referenced by apply_spooled_messages(), dumptuples(), ensure_last_message(), subxact_info_add(), tuplestore_copy_read_pointer(), tuplestore_gettuple(), tuplestore_puttuple_common(), and tuplestore_select_read_pointer().

◆ BufFileTruncateFileSet()

void BufFileTruncateFileSet ( BufFile *  file,
int  fileno,
off_t  offset 
)

Definition at line 928 of file buffile.c.

929{
930 int numFiles = file->numFiles;
931 int newFile = fileno;
932 off_t newOffset = file->curOffset;
933 char segment_name[MAXPGPATH];
934 int i;
935
936 /*
937 * Loop over all the files up to the given fileno and remove the files
938 * that are greater than the fileno and truncate the given file up to the
939 * offset. Note that we also remove the given fileno if the offset is 0
940 * provided it is not the first file in which we truncate it.
941 */
942 for (i = file->numFiles - 1; i >= fileno; i--)
943 {
944 if ((i != fileno || offset == 0) && i != 0)
945 {
946 FileSetSegmentName(segment_name, file->name, i);
947 FileClose(file->files[i]);
948 if (!FileSetDelete(file->fileset, segment_name, true))
951 errmsg("could not delete fileset \"%s\": %m",
952 segment_name)));
953 numFiles--;
954 newOffset = MAX_PHYSICAL_FILESIZE;
955
956 /*
957 * This is required to indicate that we have deleted the given
958 * fileno.
959 */
960 if (i == fileno)
961 newFile--;
962 }
963 else
964 {
965 if (FileTruncate(file->files[i], offset,
966 WAIT_EVENT_BUFFILE_TRUNCATE) < 0)
969 errmsg("could not truncate file \"%s\": %m",
970 FilePathName(file->files[i]))));
971 newOffset = offset;
972 }
973 }
974
975 file->numFiles = numFiles;
976
977 /*
978 * If the truncate point is within existing buffer then we can just adjust
979 * pos within buffer.
980 */
981 if (newFile == file->curFile &&
982 newOffset >= file->curOffset &&
983 newOffset <= file->curOffset + file->nbytes)
984 {
985 /* No need to reset the current pos if the new pos is greater. */
986 if (newOffset <= file->curOffset + file->pos)
987 file->pos = (int) (newOffset - file->curOffset);
988
989 /* Adjust the nbytes for the current buffer. */
990 file->nbytes = (int) (newOffset - file->curOffset);
991 }
992 else if (newFile == file->curFile &&
993 newOffset < file->curOffset)
994 {
995 /*
996 * The truncate point is within the existing file but prior to the
997 * current position, so we can forget the current buffer and reset the
998 * current position.
999 */
1000 file->curOffset = newOffset;
1001 file->pos = 0;
1002 file->nbytes = 0;
1003 }
1004 else if (newFile < file->curFile)
1005 {
1006 /*
1007 * The truncate point is prior to the current file, so need to reset
1008 * the current position accordingly.
1009 */
1010 file->curFile = newFile;
1011 file->curOffset = newOffset;
1012 file->pos = 0;
1013 file->nbytes = 0;
1014 }
1015 /* Nothing to do, if the truncate point is beyond current file. */
1016}
int FileTruncate(File file, off_t offset, uint32 wait_event_info)
Definition: fd.c:2478

References BufFile::curFile, BufFile::curOffset, ereport, errcode_for_file_access(), errmsg(), ERROR, FileClose(), FilePathName(), BufFile::files, BufFile::fileset, FileSetDelete(), FileSetSegmentName(), FileTruncate(), i, MAX_PHYSICAL_FILESIZE, MAXPGPATH, BufFile::name, BufFile::nbytes, BufFile::numFiles, and BufFile::pos.

Referenced by stream_abort_internal().

◆ BufFileWrite()

void BufFileWrite ( BufFile *  file,
const void *  ptr,
size_t  size 
)

Definition at line 676 of file buffile.c.

677{
678 size_t nthistime;
679
680 Assert(!file->readOnly);
681
682 while (size > 0)
683 {
684 if (file->pos >= BLCKSZ)
685 {
686 /* Buffer full, dump it out */
687 if (file->dirty)
688 BufFileDumpBuffer(file);
689 else
690 {
691 /* Hmm, went directly from reading to writing? */
692 file->curOffset += file->pos;
693 file->pos = 0;
694 file->nbytes = 0;
695 }
696 }
697
698 nthistime = BLCKSZ - file->pos;
699 if (nthistime > size)
700 nthistime = size;
701 Assert(nthistime > 0);
702
703 memcpy(file->buffer.data + file->pos, ptr, nthistime);
704
705 file->dirty = true;
706 file->pos += nthistime;
707 if (file->nbytes < file->pos)
708 file->nbytes = file->pos;
709 ptr = (const char *) ptr + nthistime;
710 size -= nthistime;
711 }
712}

References Assert(), BufFile::buffer, BufFileDumpBuffer(), BufFile::curOffset, PGAlignedBlock::data, BufFile::dirty, BufFile::nbytes, BufFile::pos, and BufFile::readOnly.

Referenced by AppendStringToManifest(), ExecHashJoinSaveTuple(), ltsWriteBlock(), stream_write_change(), sts_flush_chunk(), subxact_info_write(), WriteTempFileBlock(), and writetup_heap().

◆ extendBufFile()

static void extendBufFile ( BufFile *  file )
static

Definition at line 156 of file buffile.c.

157{
158 File pfile;
159 ResourceOwner oldowner;
160
161 /* Be sure to associate the file with the BufFile's resource owner */
162 oldowner = CurrentResourceOwner;
164
165 if (file->fileset == NULL)
166 pfile = OpenTemporaryFile(file->isInterXact);
167 else
168 pfile = MakeNewFileSetSegment(file, file->numFiles);
169
170 Assert(pfile >= 0);
171
172 CurrentResourceOwner = oldowner;
173
174 file->files = (File *) repalloc(file->files,
175 (file->numFiles + 1) * sizeof(File));
176 file->files[file->numFiles] = pfile;
177 file->numFiles++;
178}
ResourceOwner CurrentResourceOwner
Definition: resowner.c:173

References Assert(), CurrentResourceOwner, BufFile::files, BufFile::fileset, BufFile::isInterXact, MakeNewFileSetSegment(), BufFile::numFiles, OpenTemporaryFile(), repalloc(), and BufFile::resowner.

Referenced by BufFileDumpBuffer().

◆ FileSetSegmentName()

static void FileSetSegmentName ( char *  name,
const char *  buffile_name,
int  segment 
)
static

Definition at line 222 of file buffile.c.

223{
224 snprintf(name, MAXPGPATH, "%s.%d", buffile_name, segment);
225}
#define snprintf
Definition: port.h:239

References MAXPGPATH, name, and snprintf.

Referenced by BufFileDeleteFileSet(), BufFileOpenFileSet(), BufFileTruncateFileSet(), and MakeNewFileSetSegment().

◆ makeBufFile()

static BufFile * makeBufFile ( File  firstfile )
static

Definition at line 139 of file buffile.c.

140{
141 BufFile *file = makeBufFileCommon(1);
142
143 file->files = (File *) palloc(sizeof(File));
144 file->files[0] = firstfile;
145 file->readOnly = false;
146 file->fileset = NULL;
147 file->name = NULL;
148
149 return file;
150}

References BufFile::files, BufFile::fileset, makeBufFileCommon(), BufFile::name, palloc(), and BufFile::readOnly.

Referenced by BufFileCreateTemp().

◆ makeBufFileCommon()

static BufFile * makeBufFileCommon ( int  nfiles )
static

Definition at line 118 of file buffile.c.

119{
120 BufFile *file = (BufFile *) palloc(sizeof(BufFile));
121
122 file->numFiles = nfiles;
123 file->isInterXact = false;
124 file->dirty = false;
126 file->curFile = 0;
127 file->curOffset = 0;
128 file->pos = 0;
129 file->nbytes = 0;
130
131 return file;
132}

References BufFile::curFile, BufFile::curOffset, CurrentResourceOwner, BufFile::dirty, BufFile::isInterXact, BufFile::nbytes, BufFile::numFiles, palloc(), BufFile::pos, and BufFile::resowner.

Referenced by BufFileCreateFileSet(), BufFileOpenFileSet(), and makeBufFile().

◆ MakeNewFileSetSegment()

static File MakeNewFileSetSegment ( BufFile *  buffile,
int  segment 
)
static

Definition at line 231 of file buffile.c.

232{
233 char name[MAXPGPATH];
234 File file;
235
236 /*
237 * It is possible that there are files left over from before a crash
238 * restart with the same name. In order for BufFileOpenFileSet() not to
239 * get confused about how many segments there are, we'll unlink the next
240 * segment number if it already exists.
241 */
242 FileSetSegmentName(name, buffile->name, segment + 1);
243 FileSetDelete(buffile->fileset, name, true);
244
245 /* Create the new segment. */
246 FileSetSegmentName(name, buffile->name, segment);
247 file = FileSetCreate(buffile->fileset, name);
248
249 /* FileSetCreate would've errored out */
250 Assert(file > 0);
251
252 return file;
253}
File FileSetCreate(FileSet *fileset, const char *name)
Definition: fileset.c:92

References Assert(), BufFile::fileset, FileSetCreate(), FileSetDelete(), FileSetSegmentName(), MAXPGPATH, BufFile::name, and name.

Referenced by BufFileCreateFileSet(), and extendBufFile().

AltStyle によって変換されたページ (->オリジナル) /