granicus.if.org Git - postgresql/blob - src/bin/pg_resetxlog/pg_resetxlog.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * pg_resetxlog.c
   4  *        A utility to "zero out" the xlog when it's corrupt beyond recovery.
   5  *        Can also rebuild pg_control if needed.
   6  *
   7  * The theory of operation is fairly simple:
   8  *        1. Read the existing pg_control (which will include the last
   9  *               checkpoint record).  If it is an old format then update to
  10  *               current format.
  11  *        2. If pg_control is corrupt, attempt to intuit reasonable values,
  12  *               by scanning the old xlog if necessary.
  13  *        3. Modify pg_control to reflect a "shutdown" state with a checkpoint
  14  *               record at the start of xlog.
  15  *        4. Flush the existing xlog files and write a new segment with
  16  *               just a checkpoint record in it.  The new segment is positioned
  17  *               just past the end of the old xlog, so that existing LSNs in
  18  *               data pages will appear to be "in the past".
  19  * This is all pretty straightforward except for the intuition part of
  20  * step 2 ...
  21  *
  22  *
  23  * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
  24  * Portions Copyright (c) 1994, Regents of the University of California
  25  *
  26  * $PostgreSQL: pgsql/src/bin/pg_resetxlog/pg_resetxlog.c,v 1.25 2004/11/17 21:37:47 tgl Exp $
  27  *
  28  *-------------------------------------------------------------------------
  29  */
  30 #include "postgres.h"
  31
  32 #include <dirent.h>
  33 #include <fcntl.h>
  34 #include <locale.h>
  35 #include <sys/stat.h>
  36 #include <sys/time.h>
  37 #include <time.h>
  38 #include <unistd.h>
  39 #ifdef HAVE_GETOPT_H
  40 #include <getopt.h>
  41 #endif
  42
  43 #include "access/xlog.h"
  44 #include "access/xlog_internal.h"
  45 #include "catalog/catversion.h"
  46 #include "catalog/pg_control.h"
  47
  48 extern int      optind;
  49 extern char *optarg;
  50
  51 #define _(x) gettext((x))
  52
  53
  54 char            XLogDir[MAXPGPATH]; /* not static, see xlog_internal.h */
  55 static char ControlFilePath[MAXPGPATH];
  56
  57 static ControlFileData ControlFile;             /* pg_control values */
  58 static uint32 newXlogId,
  59                         newXlogSeg;                     /* ID/Segment of new XLOG segment */
  60 static bool guessed = false;    /* T if we had to guess at any values */
  61 static const char *progname;
  62
  63 static bool ReadControlFile(void);
  64 static void GuessControlValues(void);
  65 static void PrintControlValues(bool guessed);
  66 static void RewriteControlFile(void);
  67 static void KillExistingXLOG(void);
  68 static void WriteEmptyXLOG(void);
  69 static void usage(void);
  70
  71
  72 int
  73 main(int argc, char *argv[])
  74 {
  75         int                     c;
  76         bool            force = false;
  77         bool            noupdate = false;
  78         TransactionId set_xid = 0;
  79         Oid                     set_oid = 0;
  80         uint32          minXlogId = 0,
  81                                 minXlogSeg = 0;
  82         char       *endptr;
  83         char       *endptr2;
  84         char       *DataDir;
  85         int                     fd;
  86         char            path[MAXPGPATH];
  87
  88         set_pglocale_pgservice(argv[0], "pg_resetxlog");
  89
  90         progname = get_progname(argv[0]);
  91
  92         if (argc > 1)
  93         {
  94                 if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
  95                 {
  96                         usage();
  97                         exit(0);
  98                 }
  99                 if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
 100                 {
 101                         puts("pg_resetxlog (PostgreSQL) " PG_VERSION);
 102                         exit(0);
 103                 }
 104         }
 105
 106
 107         while ((c = getopt(argc, argv, "fl:no:x:")) != -1)
 108         {
 109                 switch (c)
 110                 {
 111                         case 'f':
 112                                 force = true;
 113                                 break;
 114
 115                         case 'n':
 116                                 noupdate = true;
 117                                 break;
 118
 119                         case 'x':
 120                                 set_xid = strtoul(optarg, &endptr, 0);
 121                                 if (endptr == optarg || *endptr != '\0')
 122                                 {
 123                                         fprintf(stderr, _("%s: invalid argument for option -x\n"), progname);
 124                                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 125                                         exit(1);
 126                                 }
 127                                 if (set_xid == 0)
 128                                 {
 129                                         fprintf(stderr, _("%s: transaction ID (-x) must not be 0\n"), progname);
 130                                         exit(1);
 131                                 }
 132                                 break;
 133
 134                         case 'o':
 135                                 set_oid = strtoul(optarg, &endptr, 0);
 136                                 if (endptr == optarg || *endptr != '\0')
 137                                 {
 138                                         fprintf(stderr, _("%s: invalid argument for option -o\n"), progname);
 139                                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 140                                         exit(1);
 141                                 }
 142                                 if (set_oid == 0)
 143                                 {
 144                                         fprintf(stderr, _("%s: OID (-o) must not be 0\n"), progname);
 145                                         exit(1);
 146                                 }
 147                                 break;
 148
 149                         case 'l':
 150                                 minXlogId = strtoul(optarg, &endptr, 0);
 151                                 if (endptr == optarg || *endptr != ',')
 152                                 {
 153                                         fprintf(stderr, _("%s: invalid argument for option -l\n"), progname);
 154                                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 155                                         exit(1);
 156                                 }
 157                                 minXlogSeg = strtoul(endptr + 1, &endptr2, 0);
 158                                 if (endptr2 == endptr + 1 || *endptr2 != '\0')
 159                                 {
 160                                         fprintf(stderr, _("%s: invalid argument for option -l\n"), progname);
 161                                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 162                                         exit(1);
 163                                 }
 164                                 break;
 165
 166                         default:
 167                                 fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 168                                 exit(1);
 169                 }
 170         }
 171
 172         if (optind == argc)
 173         {
 174                 fprintf(stderr, _("%s: no data directory specified\n"), progname);
 175                 fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 176                 exit(1);
 177         }
 178
 179         DataDir = argv[optind];
 180         snprintf(XLogDir, MAXPGPATH, "%s/pg_xlog", DataDir);
 181         snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", DataDir);
 182
 183         /*
 184          * Check for a postmaster lock file --- if there is one, refuse to
 185          * proceed, on grounds we might be interfering with a live
 186          * installation.
 187          */
 188         snprintf(path, MAXPGPATH, "%s/postmaster.pid", DataDir);
 189
 190         if ((fd = open(path, O_RDONLY)) < 0)
 191         {
 192                 if (errno != ENOENT)
 193                 {
 194                         fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"), progname, path, strerror(errno));
 195                         exit(1);
 196                 }
 197         }
 198         else
 199         {
 200                 fprintf(stderr, _("%s: lock file \"%s\" exists\n"
 201                                                   "Is a server running?  If not, delete the lock file and try again.\n"),
 202                                 progname, path);
 203                 exit(1);
 204         }
 205
 206         /*
 207          * Attempt to read the existing pg_control file
 208          */
 209         if (!ReadControlFile())
 210                 GuessControlValues();
 211
 212         /*
 213          * Adjust fields if required by switches.  (Do this now so that
 214          * printout, if any, includes these values.)
 215          */
 216         if (set_xid != 0)
 217                 ControlFile.checkPointCopy.nextXid = set_xid;
 218
 219         if (set_oid != 0)
 220                 ControlFile.checkPointCopy.nextOid = set_oid;
 221
 222         if (minXlogId > ControlFile.logId ||
 223                 (minXlogId == ControlFile.logId &&
 224                  minXlogSeg > ControlFile.logSeg))
 225         {
 226                 ControlFile.logId = minXlogId;
 227                 ControlFile.logSeg = minXlogSeg;
 228         }
 229
 230         /*
 231          * If we had to guess anything, and -f was not given, just print the
 232          * guessed values and exit.  Also print if -n is given.
 233          */
 234         if ((guessed && !force) || noupdate)
 235         {
 236                 PrintControlValues(guessed);
 237                 if (!noupdate)
 238                 {
 239                         printf(_("\nIf these values seem acceptable, use -f to force reset.\n"));
 240                         exit(1);
 241                 }
 242                 else
 243                         exit(0);
 244         }
 245
 246         /*
 247          * Don't reset from a dirty pg_control without -f, either.
 248          */
 249         if (ControlFile.state != DB_SHUTDOWNED && !force)
 250         {
 251                 printf(_("The database server was not shut down cleanly.\n"
 252                          "Resetting the transaction log may cause data to be lost.\n"
 253                          "If you want to proceed anyway, use -f to force reset.\n"));
 254                 exit(1);
 255         }
 256
 257         /*
 258          * Else, do the dirty deed.
 259          */
 260         RewriteControlFile();
 261         KillExistingXLOG();
 262         WriteEmptyXLOG();
 263
 264         printf(_("Transaction log reset\n"));
 265         return 0;
 266 }
 267
 268
 269 /*
 270  * Try to read the existing pg_control file.
 271  *
 272  * This routine is also responsible for updating old pg_control versions
 273  * to the current format.  (Currently we don't do anything of the sort.)
 274  */
 275 static bool
 276 ReadControlFile(void)
 277 {
 278         int                     fd;
 279         int                     len;
 280         char       *buffer;
 281         crc64           crc;
 282
 283         if ((fd = open(ControlFilePath, O_RDONLY)) < 0)
 284         {
 285                 /*
 286                  * If pg_control is not there at all, or we can't read it, the
 287                  * odds are we've been handed a bad DataDir path, so give up. User
 288                  * can do "touch pg_control" to force us to proceed.
 289                  */
 290                 fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
 291                                 progname, ControlFilePath, strerror(errno));
 292                 if (errno == ENOENT)
 293                         fprintf(stderr, _("If you are sure the data directory path is correct, execute\n"
 294                                                           "  touch %s\n"
 295                                                           "and try again.\n"),
 296                                         ControlFilePath);
 297                 exit(1);
 298         }
 299
 300         /* Use malloc to ensure we have a maxaligned buffer */
 301         buffer = (char *) malloc(BLCKSZ);
 302
 303         len = read(fd, buffer, BLCKSZ);
 304         if (len < 0)
 305         {
 306                 fprintf(stderr, _("%s: could not read file \"%s\": %s\n"),
 307                                 progname, ControlFilePath, strerror(errno));
 308                 exit(1);
 309         }
 310         close(fd);
 311
 312         if (len >= sizeof(ControlFileData) &&
 313                 ((ControlFileData *) buffer)->pg_control_version == PG_CONTROL_VERSION)
 314         {
 315                 /* Check the CRC. */
 316                 INIT_CRC64(crc);
 317                 COMP_CRC64(crc,
 318                                    buffer + sizeof(crc64),
 319                                    sizeof(ControlFileData) - sizeof(crc64));
 320                 FIN_CRC64(crc);
 321
 322                 if (EQ_CRC64(crc, ((ControlFileData *) buffer)->crc))
 323                 {
 324                         /* Valid data... */
 325                         memcpy(&ControlFile, buffer, sizeof(ControlFile));
 326                         return true;
 327                 }
 328
 329                 fprintf(stderr, _("%s: pg_control exists but has invalid CRC; proceed with caution\n"),
 330                                 progname);
 331                 /* We will use the data anyway, but treat it as guessed. */
 332                 memcpy(&ControlFile, buffer, sizeof(ControlFile));
 333                 guessed = true;
 334                 return true;
 335         }
 336
 337         /* Looks like it's a mess. */
 338         fprintf(stderr, _("%s: pg_control exists but is broken or unknown version; ignoring it\n"),
 339                         progname);
 340         return false;
 341 }
 342
 343
 344 /*
 345  * Guess at pg_control values when we can't read the old ones.
 346  */
 347 static void
 348 GuessControlValues(void)
 349 {
 350         uint64          sysidentifier;
 351         struct timeval tv;
 352         char       *localeptr;
 353
 354         /*
 355          * Set up a completely default set of pg_control values.
 356          */
 357         guessed = true;
 358         memset(&ControlFile, 0, sizeof(ControlFile));
 359
 360         ControlFile.pg_control_version = PG_CONTROL_VERSION;
 361         ControlFile.catalog_version_no = CATALOG_VERSION_NO;
 362
 363         /*
 364          * Create a new unique installation identifier, since we can no longer
 365          * use any old XLOG records.  See notes in xlog.c about the algorithm.
 366          */
 367         gettimeofday(&tv, NULL);
 368         sysidentifier = ((uint64) tv.tv_sec) << 32;
 369         sysidentifier |= (uint32) (tv.tv_sec | tv.tv_usec);
 370
 371         ControlFile.system_identifier = sysidentifier;
 372
 373         ControlFile.checkPointCopy.redo.xlogid = 0;
 374         ControlFile.checkPointCopy.redo.xrecoff = SizeOfXLogLongPHD;
 375         ControlFile.checkPointCopy.undo = ControlFile.checkPointCopy.redo;
 376         ControlFile.checkPointCopy.ThisTimeLineID = 1;
 377         ControlFile.checkPointCopy.nextXid = (TransactionId) 514;       /* XXX */
 378         ControlFile.checkPointCopy.nextOid = BootstrapObjectIdData;
 379         ControlFile.checkPointCopy.time = time(NULL);
 380
 381         ControlFile.state = DB_SHUTDOWNED;
 382         ControlFile.time = time(NULL);
 383         ControlFile.logId = 0;
 384         ControlFile.logSeg = 1;
 385         ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
 386
 387         ControlFile.blcksz = BLCKSZ;
 388         ControlFile.relseg_size = RELSEG_SIZE;
 389         ControlFile.xlog_seg_size = XLOG_SEG_SIZE;
 390         ControlFile.nameDataLen = NAMEDATALEN;
 391         ControlFile.funcMaxArgs = FUNC_MAX_ARGS;
 392 #ifdef HAVE_INT64_TIMESTAMP
 393         ControlFile.enableIntTimes = TRUE;
 394 #else
 395         ControlFile.enableIntTimes = FALSE;
 396 #endif
 397         ControlFile.localeBuflen = LOCALE_NAME_BUFLEN;
 398
 399         localeptr = setlocale(LC_COLLATE, "");
 400         if (!localeptr)
 401         {
 402                 fprintf(stderr, _("%s: invalid LC_COLLATE setting\n"), progname);
 403                 exit(1);
 404         }
 405         StrNCpy(ControlFile.lc_collate, localeptr, LOCALE_NAME_BUFLEN);
 406         localeptr = setlocale(LC_CTYPE, "");
 407         if (!localeptr)
 408         {
 409                 fprintf(stderr, _("%s: invalid LC_CTYPE setting\n"), progname);
 410                 exit(1);
 411         }
 412         StrNCpy(ControlFile.lc_ctype, localeptr, LOCALE_NAME_BUFLEN);
 413
 414         /*
 415          * XXX eventually, should try to grovel through old XLOG to develop
 416          * more accurate values for TimeLineID, nextXID, and nextOID.
 417          */
 418 }
 419
 420
 421 /*
 422  * Print the guessed pg_control values when we had to guess.
 423  *
 424  * NB: this display should be just those fields that will not be
 425  * reset by RewriteControlFile().
 426  */
 427 static void
 428 PrintControlValues(bool guessed)
 429 {
 430         char            sysident_str[32];
 431
 432         if (guessed)
 433                 printf(_("Guessed pg_control values:\n\n"));
 434         else
 435                 printf(_("pg_control values:\n\n"));
 436
 437         /*
 438          * Format system_identifier separately to keep platform-dependent
 439          * format code out of the translatable message string.
 440          */
 441         snprintf(sysident_str, sizeof(sysident_str), UINT64_FORMAT,
 442                          ControlFile.system_identifier);
 443
 444         printf(_("pg_control version number:            %u\n"), ControlFile.pg_control_version);
 445         printf(_("Catalog version number:               %u\n"), ControlFile.catalog_version_no);
 446         printf(_("Database system identifier:           %s\n"), sysident_str);
 447         printf(_("Current log file ID:                  %u\n"), ControlFile.logId);
 448         printf(_("Next log file segment:                %u\n"), ControlFile.logSeg);
 449         printf(_("Latest checkpoint's TimeLineID:       %u\n"), ControlFile.checkPointCopy.ThisTimeLineID);
 450         printf(_("Latest checkpoint's NextXID:          %u\n"), ControlFile.checkPointCopy.nextXid);
 451         printf(_("Latest checkpoint's NextOID:          %u\n"), ControlFile.checkPointCopy.nextOid);
 452         printf(_("Database block size:                  %u\n"), ControlFile.blcksz);
 453         printf(_("Blocks per segment of large relation: %u\n"), ControlFile.relseg_size);
 454         printf(_("Maximum length of identifiers:        %u\n"), ControlFile.nameDataLen);
 455         printf(_("Maximum number of function arguments: %u\n"), ControlFile.funcMaxArgs);
 456         printf(_("Date/time type storage:               %s\n"),
 457                    (ControlFile.enableIntTimes ? _("64-bit integers") : _("floating-point numbers")));
 458         printf(_("Maximum length of locale name:        %u\n"), ControlFile.localeBuflen);
 459         printf(_("LC_COLLATE:                           %s\n"), ControlFile.lc_collate);
 460         printf(_("LC_CTYPE:                             %s\n"), ControlFile.lc_ctype);
 461 }
 462
 463
 464 /*
 465  * Write out the new pg_control file.
 466  */
 467 static void
 468 RewriteControlFile(void)
 469 {
 470         int                     fd;
 471         char            buffer[BLCKSZ]; /* need not be aligned */
 472
 473         /*
 474          * Adjust fields as needed to force an empty XLOG starting at the next
 475          * available segment.
 476          */
 477         newXlogId = ControlFile.logId;
 478         newXlogSeg = ControlFile.logSeg;
 479
 480         /* adjust in case we are changing segment size */
 481         newXlogSeg *= ControlFile.xlog_seg_size;
 482         newXlogSeg = (newXlogSeg + XLogSegSize - 1) / XLogSegSize;
 483
 484         /* be sure we wrap around correctly at end of a logfile */
 485         NextLogSeg(newXlogId, newXlogSeg);
 486
 487         /* Now we can force the recorded xlog seg size to the right thing. */
 488         ControlFile.xlog_seg_size = XLogSegSize;
 489
 490         ControlFile.checkPointCopy.redo.xlogid = newXlogId;
 491         ControlFile.checkPointCopy.redo.xrecoff =
 492                 newXlogSeg * XLogSegSize + SizeOfXLogLongPHD;
 493         ControlFile.checkPointCopy.undo = ControlFile.checkPointCopy.redo;
 494         ControlFile.checkPointCopy.time = time(NULL);
 495
 496         ControlFile.state = DB_SHUTDOWNED;
 497         ControlFile.time = time(NULL);
 498         ControlFile.logId = newXlogId;
 499         ControlFile.logSeg = newXlogSeg + 1;
 500         ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
 501         ControlFile.prevCheckPoint.xlogid = 0;
 502         ControlFile.prevCheckPoint.xrecoff = 0;
 503
 504         /* Contents are protected with a CRC */
 505         INIT_CRC64(ControlFile.crc);
 506         COMP_CRC64(ControlFile.crc,
 507                            (char *) &ControlFile + sizeof(crc64),
 508                            sizeof(ControlFileData) - sizeof(crc64));
 509         FIN_CRC64(ControlFile.crc);
 510
 511         /*
 512          * We write out BLCKSZ bytes into pg_control, zero-padding the excess
 513          * over sizeof(ControlFileData).  This reduces the odds of
 514          * premature-EOF errors when reading pg_control.  We'll still fail
 515          * when we check the contents of the file, but hopefully with a more
 516          * specific error than "couldn't read pg_control".
 517          */
 518         if (sizeof(ControlFileData) > BLCKSZ)
 519         {
 520                 fprintf(stderr,
 521                                 _("%s: internal error -- sizeof(ControlFileData) is too large ... fix xlog.c\n"),
 522                                 progname);
 523                 exit(1);
 524         }
 525
 526         memset(buffer, 0, BLCKSZ);
 527         memcpy(buffer, &ControlFile, sizeof(ControlFileData));
 528
 529         unlink(ControlFilePath);
 530
 531         fd = open(ControlFilePath, O_RDWR | O_CREAT | O_EXCL | PG_BINARY, S_IRUSR | S_IWUSR);
 532         if (fd < 0)
 533         {
 534                 fprintf(stderr, _("%s: could not create pg_control file: %s\n"),
 535                                 progname, strerror(errno));
 536                 exit(1);
 537         }
 538
 539         errno = 0;
 540         if (write(fd, buffer, BLCKSZ) != BLCKSZ)
 541         {
 542                 /* if write didn't set errno, assume problem is no disk space */
 543                 if (errno == 0)
 544                         errno = ENOSPC;
 545                 fprintf(stderr, _("%s: could not write pg_control file: %s\n"),
 546                                 progname, strerror(errno));
 547                 exit(1);
 548         }
 549
 550         if (fsync(fd) != 0)
 551         {
 552                 fprintf(stderr, _("%s: fsync error: %s\n"), progname, strerror(errno));
 553                 exit(1);
 554         }
 555
 556         close(fd);
 557 }
 558
 559
 560 /*
 561  * Remove existing XLOG files
 562  */
 563 static void
 564 KillExistingXLOG(void)
 565 {
 566         DIR                *xldir;
 567         struct dirent *xlde;
 568         char            path[MAXPGPATH];
 569
 570         xldir = opendir(XLogDir);
 571         if (xldir == NULL)
 572         {
 573                 fprintf(stderr, _("%s: could not open directory \"%s\": %s\n"),
 574                                 progname, XLogDir, strerror(errno));
 575                 exit(1);
 576         }
 577
 578         errno = 0;
 579         while ((xlde = readdir(xldir)) != NULL)
 580         {
 581                 if (strlen(xlde->d_name) == 16 &&
 582                         strspn(xlde->d_name, "0123456789ABCDEF") == 16)
 583                 {
 584                         snprintf(path, MAXPGPATH, "%s/%s", XLogDir, xlde->d_name);
 585                         if (unlink(path) < 0)
 586                         {
 587                                 fprintf(stderr, _("%s: could not delete file \"%s\": %s\n"),
 588                                                 progname, path, strerror(errno));
 589                                 exit(1);
 590                         }
 591                 }
 592                 errno = 0;
 593         }
 594 #ifdef WIN32
 595
 596         /*
 597          * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but
 598          * not in released version
 599          */
 600         if (GetLastError() == ERROR_NO_MORE_FILES)
 601                 errno = 0;
 602 #endif
 603
 604         if (errno)
 605         {
 606                 fprintf(stderr, _("%s: could not read from directory \"%s\": %s\n"),
 607                                 progname, XLogDir, strerror(errno));
 608                 exit(1);
 609         }
 610         closedir(xldir);
 611 }
 612
 613
 614 /*
 615  * Write an empty XLOG file, containing only the checkpoint record
 616  * already set up in ControlFile.
 617  */
 618 static void
 619 WriteEmptyXLOG(void)
 620 {
 621         char       *buffer;
 622         XLogPageHeader page;
 623         XLogLongPageHeader longpage;
 624         XLogRecord *record;
 625         crc64           crc;
 626         char            path[MAXPGPATH];
 627         int                     fd;
 628         int                     nbytes;
 629
 630         /* Use malloc() to ensure buffer is MAXALIGNED */
 631         buffer = (char *) malloc(BLCKSZ);
 632         page = (XLogPageHeader) buffer;
 633         memset(buffer, 0, BLCKSZ);
 634
 635         /* Set up the XLOG page header */
 636         page->xlp_magic = XLOG_PAGE_MAGIC;
 637         page->xlp_info = XLP_LONG_HEADER;
 638         page->xlp_tli = ControlFile.checkPointCopy.ThisTimeLineID;
 639         page->xlp_pageaddr.xlogid =
 640                 ControlFile.checkPointCopy.redo.xlogid;
 641         page->xlp_pageaddr.xrecoff =
 642                 ControlFile.checkPointCopy.redo.xrecoff - SizeOfXLogLongPHD;
 643         longpage = (XLogLongPageHeader) page;
 644         longpage->xlp_sysid = ControlFile.system_identifier;
 645         longpage->xlp_seg_size = XLogSegSize;
 646
 647         /* Insert the initial checkpoint record */
 648         record = (XLogRecord *) ((char *) page + SizeOfXLogLongPHD);
 649         record->xl_prev.xlogid = 0;
 650         record->xl_prev.xrecoff = 0;
 651         record->xl_xid = InvalidTransactionId;
 652         record->xl_len = sizeof(CheckPoint);
 653         record->xl_info = XLOG_CHECKPOINT_SHUTDOWN;
 654         record->xl_rmid = RM_XLOG_ID;
 655         memcpy(XLogRecGetData(record), &ControlFile.checkPointCopy,
 656                    sizeof(CheckPoint));
 657
 658         INIT_CRC64(crc);
 659         COMP_CRC64(crc, &ControlFile.checkPointCopy, sizeof(CheckPoint));
 660         COMP_CRC64(crc, (char *) record + sizeof(crc64),
 661                            SizeOfXLogRecord - sizeof(crc64));
 662         FIN_CRC64(crc);
 663         record->xl_crc = crc;
 664
 665         /* Write the first page */
 666         XLogFilePath(path, ControlFile.checkPointCopy.ThisTimeLineID,
 667                                  newXlogId, newXlogSeg);
 668
 669         unlink(path);
 670
 671         fd = open(path, O_RDWR | O_CREAT | O_EXCL | PG_BINARY,
 672                           S_IRUSR | S_IWUSR);
 673         if (fd < 0)
 674         {
 675                 fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
 676                                 progname, path, strerror(errno));
 677                 exit(1);
 678         }
 679
 680         errno = 0;
 681         if (write(fd, buffer, BLCKSZ) != BLCKSZ)
 682         {
 683                 /* if write didn't set errno, assume problem is no disk space */
 684                 if (errno == 0)
 685                         errno = ENOSPC;
 686                 fprintf(stderr, _("%s: could not write file \"%s\": %s\n"),
 687                                 progname, path, strerror(errno));
 688                 exit(1);
 689         }
 690
 691         /* Fill the rest of the file with zeroes */
 692         memset(buffer, 0, BLCKSZ);
 693         for (nbytes = BLCKSZ; nbytes < XLogSegSize; nbytes += BLCKSZ)
 694         {
 695                 errno = 0;
 696                 if (write(fd, buffer, BLCKSZ) != BLCKSZ)
 697                 {
 698                         if (errno == 0)
 699                                 errno = ENOSPC;
 700                         fprintf(stderr, _("%s: could not write file \"%s\": %s\n"),
 701                                         progname, path, strerror(errno));
 702                         exit(1);
 703                 }
 704         }
 705
 706         if (fsync(fd) != 0)
 707         {
 708                 fprintf(stderr, _("%s: fsync error: %s\n"), progname, strerror(errno));
 709                 exit(1);
 710         }
 711
 712         close(fd);
 713 }
 714
 715
 716 static void
 717 usage(void)
 718 {
 719         printf(_("%s resets the PostgreSQL transaction log.\n\n"), progname);
 720         printf(_("Usage:\n  %s [OPTION]... DATADIR\n\n"), progname);
 721         printf(_("Options:\n"));
 722         printf(_("  -f              force update to be done\n"));
 723         printf(_("  -l FILEID,SEG   force minimum WAL starting location for new transaction log\n"));
 724         printf(_("  -n              no update, just show extracted control values (for testing)\n"));
 725         printf(_("  -o OID          set next OID\n"));
 726         printf(_("  -x XID          set next transaction ID\n"));
 727         printf(_("  --help          show this help, then exit\n"));
 728         printf(_("  --version       output version information, then exit\n"));
 729         printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
 730 }