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

   1 /*
   2  *      controldata.c
   3  *
   4  *      controldata functions
   5  *
   6  *      Copyright (c) 2010-2018, PostgreSQL Global Development Group
   7  *      src/bin/pg_upgrade/controldata.c
   8  */
   9
  10 #include "postgres_fe.h"
  11
  12 #include "pg_upgrade.h"
  13
  14 #include <ctype.h>
  15
  16 /*
  17  * get_control_data()
  18  *
  19  * gets pg_control information in "ctrl". Assumes that bindir and
  20  * datadir are valid absolute paths to postgresql bin and pgdata
  21  * directories respectively *and* pg_resetwal is version compatible
  22  * with datadir. The main purpose of this function is to get pg_control
  23  * data in a version independent manner.
  24  *
  25  * The approach taken here is to invoke pg_resetwal with -n option
  26  * and then pipe its output. With little string parsing we get the
  27  * pg_control data.  pg_resetwal cannot be run while the server is running
  28  * so we use pg_controldata;  pg_controldata doesn't provide all the fields
  29  * we need to actually perform the upgrade, but it provides enough for
  30  * check mode.  We do not implement pg_resetwal -n because it is hard to
  31  * return valid xid data for a running server.
  32  */
  33 void
  34 get_control_data(ClusterInfo *cluster, bool live_check)
  35 {
  36         char            cmd[MAXPGPATH];
  37         char            bufin[MAX_STRING];
  38         FILE       *output;
  39         char       *p;
  40         bool            got_tli = false;
  41         bool            got_log_id = false;
  42         bool            got_log_seg = false;
  43         bool            got_xid = false;
  44         bool            got_oid = false;
  45         bool            got_multi = false;
  46         bool            got_oldestmulti = false;
  47         bool            got_mxoff = false;
  48         bool            got_nextxlogfile = false;
  49         bool            got_float8_pass_by_value = false;
  50         bool            got_align = false;
  51         bool            got_blocksz = false;
  52         bool            got_largesz = false;
  53         bool            got_walsz = false;
  54         bool            got_walseg = false;
  55         bool            got_ident = false;
  56         bool            got_index = false;
  57         bool            got_toast = false;
  58         bool            got_large_object = false;
  59         bool            got_date_is_int = false;
  60         bool            got_data_checksum_version = false;
  61         char       *lc_collate = NULL;
  62         char       *lc_ctype = NULL;
  63         char       *lc_monetary = NULL;
  64         char       *lc_numeric = NULL;
  65         char       *lc_time = NULL;
  66         char       *lang = NULL;
  67         char       *language = NULL;
  68         char       *lc_all = NULL;
  69         char       *lc_messages = NULL;
  70         uint32          tli = 0;
  71         uint32          logid = 0;
  72         uint32          segno = 0;
  73         char       *resetwal_bin;
  74
  75
  76         /*
  77          * Because we test the pg_resetwal output as strings, it has to be in
  78          * English.  Copied from pg_regress.c.
  79          */
  80         if (getenv("LC_COLLATE"))
  81                 lc_collate = pg_strdup(getenv("LC_COLLATE"));
  82         if (getenv("LC_CTYPE"))
  83                 lc_ctype = pg_strdup(getenv("LC_CTYPE"));
  84         if (getenv("LC_MONETARY"))
  85                 lc_monetary = pg_strdup(getenv("LC_MONETARY"));
  86         if (getenv("LC_NUMERIC"))
  87                 lc_numeric = pg_strdup(getenv("LC_NUMERIC"));
  88         if (getenv("LC_TIME"))
  89                 lc_time = pg_strdup(getenv("LC_TIME"));
  90         if (getenv("LANG"))
  91                 lang = pg_strdup(getenv("LANG"));
  92         if (getenv("LANGUAGE"))
  93                 language = pg_strdup(getenv("LANGUAGE"));
  94         if (getenv("LC_ALL"))
  95                 lc_all = pg_strdup(getenv("LC_ALL"));
  96         if (getenv("LC_MESSAGES"))
  97                 lc_messages = pg_strdup(getenv("LC_MESSAGES"));
  98
  99         pg_putenv("LC_COLLATE", NULL);
 100         pg_putenv("LC_CTYPE", NULL);
 101         pg_putenv("LC_MONETARY", NULL);
 102         pg_putenv("LC_NUMERIC", NULL);
 103         pg_putenv("LC_TIME", NULL);
 104         pg_putenv("LANG",
 105 #ifndef WIN32
 106                           NULL);
 107 #else
 108         /* On Windows the default locale cannot be English, so force it */
 109                           "en");
 110 #endif
 111         pg_putenv("LANGUAGE", NULL);
 112         pg_putenv("LC_ALL", NULL);
 113         pg_putenv("LC_MESSAGES", "C");
 114
 115         /* pg_resetxlog has been renamed to pg_resetwal in version 10 */
 116         if (GET_MAJOR_VERSION(cluster->bin_version) < 1000)
 117                 resetwal_bin = "pg_resetxlog\" -n";
 118         else
 119                 resetwal_bin = "pg_resetwal\" -n";
 120         snprintf(cmd, sizeof(cmd), "\"%s/%s \"%s\"",
 121                          cluster->bindir,
 122                          live_check ? "pg_controldata\"" : resetwal_bin,
 123                          cluster->pgdata);
 124         fflush(stdout);
 125         fflush(stderr);
 126
 127         if ((output = popen(cmd, "r")) == NULL)
 128                 pg_fatal("could not get control data using %s: %s\n",
 129                                  cmd, strerror(errno));
 130
 131         /* Only in <= 9.2 */
 132         if (GET_MAJOR_VERSION(cluster->major_version) <= 902)
 133         {
 134                 cluster->controldata.data_checksum_version = 0;
 135                 got_data_checksum_version = true;
 136         }
 137
 138         /* we have the result of cmd in "output". so parse it line by line now */
 139         while (fgets(bufin, sizeof(bufin), output))
 140         {
 141                 pg_log(PG_VERBOSE, "%s", bufin);
 142
 143                 if ((p = strstr(bufin, "pg_control version number:")) != NULL)
 144                 {
 145                         p = strchr(p, ':');
 146
 147                         if (p == NULL || strlen(p) <= 1)
 148                                 pg_fatal("%d: pg_resetwal problem\n", __LINE__);
 149
 150                         p++;                            /* remove ':' char */
 151                         cluster->controldata.ctrl_ver = str2uint(p);
 152                 }
 153                 else if ((p = strstr(bufin, "Catalog version number:")) != NULL)
 154                 {
 155                         p = strchr(p, ':');
 156
 157                         if (p == NULL || strlen(p) <= 1)
 158                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 159
 160                         p++;                            /* remove ':' char */
 161                         cluster->controldata.cat_ver = str2uint(p);
 162                 }
 163                 else if ((p = strstr(bufin, "Latest checkpoint's TimeLineID:")) != NULL)
 164                 {
 165                         p = strchr(p, ':');
 166
 167                         if (p == NULL || strlen(p) <= 1)
 168                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 169
 170                         p++;                            /* remove ':' char */
 171                         tli = str2uint(p);
 172                         got_tli = true;
 173                 }
 174                 else if ((p = strstr(bufin, "First log file ID after reset:")) != NULL)
 175                 {
 176                         p = strchr(p, ':');
 177
 178                         if (p == NULL || strlen(p) <= 1)
 179                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 180
 181                         p++;                            /* remove ':' char */
 182                         logid = str2uint(p);
 183                         got_log_id = true;
 184                 }
 185                 else if ((p = strstr(bufin, "First log file segment after reset:")) != NULL)
 186                 {
 187                         p = strchr(p, ':');
 188
 189                         if (p == NULL || strlen(p) <= 1)
 190                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 191
 192                         p++;                            /* remove ':' char */
 193                         segno = str2uint(p);
 194                         got_log_seg = true;
 195                 }
 196                 else if ((p = strstr(bufin, "Latest checkpoint's NextXID:")) != NULL)
 197                 {
 198                         p = strchr(p, ':');
 199
 200                         if (p == NULL || strlen(p) <= 1)
 201                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 202
 203                         p++;                            /* remove ':' char */
 204                         cluster->controldata.chkpnt_nxtepoch = str2uint(p);
 205
 206                         /*
 207                          * Delimiter changed from '/' to ':' in 9.6.  We don't test for
 208                          * the catalog version of the change because the catalog version
 209                          * is pulled from pg_controldata too, and it isn't worth adding an
 210                          * order dependency for this --- we just check the string.
 211                          */
 212                         if (strchr(p, '/') != NULL)
 213                                 p = strchr(p, '/');
 214                         else if (GET_MAJOR_VERSION(cluster->major_version) >= 906)
 215                                 p = strchr(p, ':');
 216                         else
 217                                 p = NULL;
 218
 219                         if (p == NULL || strlen(p) <= 1)
 220                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 221
 222                         p++;                            /* remove '/' or ':' char */
 223                         cluster->controldata.chkpnt_nxtxid = str2uint(p);
 224                         got_xid = true;
 225                 }
 226                 else if ((p = strstr(bufin, "Latest checkpoint's NextOID:")) != NULL)
 227                 {
 228                         p = strchr(p, ':');
 229
 230                         if (p == NULL || strlen(p) <= 1)
 231                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 232
 233                         p++;                            /* remove ':' char */
 234                         cluster->controldata.chkpnt_nxtoid = str2uint(p);
 235                         got_oid = true;
 236                 }
 237                 else if ((p = strstr(bufin, "Latest checkpoint's NextMultiXactId:")) != NULL)
 238                 {
 239                         p = strchr(p, ':');
 240
 241                         if (p == NULL || strlen(p) <= 1)
 242                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 243
 244                         p++;                            /* remove ':' char */
 245                         cluster->controldata.chkpnt_nxtmulti = str2uint(p);
 246                         got_multi = true;
 247                 }
 248                 else if ((p = strstr(bufin, "Latest checkpoint's oldestMultiXid:")) != NULL)
 249                 {
 250                         p = strchr(p, ':');
 251
 252                         if (p == NULL || strlen(p) <= 1)
 253                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 254
 255                         p++;                            /* remove ':' char */
 256                         cluster->controldata.chkpnt_oldstMulti = str2uint(p);
 257                         got_oldestmulti = true;
 258                 }
 259                 else if ((p = strstr(bufin, "Latest checkpoint's NextMultiOffset:")) != NULL)
 260                 {
 261                         p = strchr(p, ':');
 262
 263                         if (p == NULL || strlen(p) <= 1)
 264                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 265
 266                         p++;                            /* remove ':' char */
 267                         cluster->controldata.chkpnt_nxtmxoff = str2uint(p);
 268                         got_mxoff = true;
 269                 }
 270                 else if ((p = strstr(bufin, "First log segment after reset:")) != NULL)
 271                 {
 272                         /* Skip the colon and any whitespace after it */
 273                         p = strchr(p, ':');
 274                         if (p == NULL || strlen(p) <= 1)
 275                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 276                         p = strpbrk(p, "01234567890ABCDEF");
 277                         if (p == NULL || strlen(p) <= 1)
 278                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 279
 280                         /* Make sure it looks like a valid WAL file name */
 281                         if (strspn(p, "0123456789ABCDEF") != 24)
 282                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 283
 284                         strlcpy(cluster->controldata.nextxlogfile, p, 25);
 285                         got_nextxlogfile = true;
 286                 }
 287                 else if ((p = strstr(bufin, "Float8 argument passing:")) != NULL)
 288                 {
 289                         p = strchr(p, ':');
 290
 291                         if (p == NULL || strlen(p) <= 1)
 292                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 293
 294                         p++;                            /* remove ':' char */
 295                         /* used later for contrib check */
 296                         cluster->controldata.float8_pass_by_value = strstr(p, "by value") != NULL;
 297                         got_float8_pass_by_value = true;
 298                 }
 299                 else if ((p = strstr(bufin, "Maximum data alignment:")) != NULL)
 300                 {
 301                         p = strchr(p, ':');
 302
 303                         if (p == NULL || strlen(p) <= 1)
 304                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 305
 306                         p++;                            /* remove ':' char */
 307                         cluster->controldata.align = str2uint(p);
 308                         got_align = true;
 309                 }
 310                 else if ((p = strstr(bufin, "Database block size:")) != NULL)
 311                 {
 312                         p = strchr(p, ':');
 313
 314                         if (p == NULL || strlen(p) <= 1)
 315                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 316
 317                         p++;                            /* remove ':' char */
 318                         cluster->controldata.blocksz = str2uint(p);
 319                         got_blocksz = true;
 320                 }
 321                 else if ((p = strstr(bufin, "Blocks per segment of large relation:")) != NULL)
 322                 {
 323                         p = strchr(p, ':');
 324
 325                         if (p == NULL || strlen(p) <= 1)
 326                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 327
 328                         p++;                            /* remove ':' char */
 329                         cluster->controldata.largesz = str2uint(p);
 330                         got_largesz = true;
 331                 }
 332                 else if ((p = strstr(bufin, "WAL block size:")) != NULL)
 333                 {
 334                         p = strchr(p, ':');
 335
 336                         if (p == NULL || strlen(p) <= 1)
 337                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 338
 339                         p++;                            /* remove ':' char */
 340                         cluster->controldata.walsz = str2uint(p);
 341                         got_walsz = true;
 342                 }
 343                 else if ((p = strstr(bufin, "Bytes per WAL segment:")) != NULL)
 344                 {
 345                         p = strchr(p, ':');
 346
 347                         if (p == NULL || strlen(p) <= 1)
 348                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 349
 350                         p++;                            /* remove ':' char */
 351                         cluster->controldata.walseg = str2uint(p);
 352                         got_walseg = true;
 353                 }
 354                 else if ((p = strstr(bufin, "Maximum length of identifiers:")) != NULL)
 355                 {
 356                         p = strchr(p, ':');
 357
 358                         if (p == NULL || strlen(p) <= 1)
 359                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 360
 361                         p++;                            /* remove ':' char */
 362                         cluster->controldata.ident = str2uint(p);
 363                         got_ident = true;
 364                 }
 365                 else if ((p = strstr(bufin, "Maximum columns in an index:")) != NULL)
 366                 {
 367                         p = strchr(p, ':');
 368
 369                         if (p == NULL || strlen(p) <= 1)
 370                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 371
 372                         p++;                            /* remove ':' char */
 373                         cluster->controldata.index = str2uint(p);
 374                         got_index = true;
 375                 }
 376                 else if ((p = strstr(bufin, "Maximum size of a TOAST chunk:")) != NULL)
 377                 {
 378                         p = strchr(p, ':');
 379
 380                         if (p == NULL || strlen(p) <= 1)
 381                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 382
 383                         p++;                            /* remove ':' char */
 384                         cluster->controldata.toast = str2uint(p);
 385                         got_toast = true;
 386                 }
 387                 else if ((p = strstr(bufin, "Size of a large-object chunk:")) != NULL)
 388                 {
 389                         p = strchr(p, ':');
 390
 391                         if (p == NULL || strlen(p) <= 1)
 392                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 393
 394                         p++;                            /* remove ':' char */
 395                         cluster->controldata.large_object = str2uint(p);
 396                         got_large_object = true;
 397                 }
 398                 else if ((p = strstr(bufin, "Date/time type storage:")) != NULL)
 399                 {
 400                         p = strchr(p, ':');
 401
 402                         if (p == NULL || strlen(p) <= 1)
 403                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 404
 405                         p++;                            /* remove ':' char */
 406                         cluster->controldata.date_is_int = strstr(p, "64-bit integers") != NULL;
 407                         got_date_is_int = true;
 408                 }
 409                 else if ((p = strstr(bufin, "checksum")) != NULL)
 410                 {
 411                         p = strchr(p, ':');
 412
 413                         if (p == NULL || strlen(p) <= 1)
 414                                 pg_fatal("%d: controldata retrieval problem\n", __LINE__);
 415
 416                         p++;                            /* remove ':' char */
 417                         /* used later for contrib check */
 418                         cluster->controldata.data_checksum_version = str2uint(p);
 419                         got_data_checksum_version = true;
 420                 }
 421         }
 422
 423         pclose(output);
 424
 425         /*
 426          * Restore environment variables
 427          */
 428         pg_putenv("LC_COLLATE", lc_collate);
 429         pg_putenv("LC_CTYPE", lc_ctype);
 430         pg_putenv("LC_MONETARY", lc_monetary);
 431         pg_putenv("LC_NUMERIC", lc_numeric);
 432         pg_putenv("LC_TIME", lc_time);
 433         pg_putenv("LANG", lang);
 434         pg_putenv("LANGUAGE", language);
 435         pg_putenv("LC_ALL", lc_all);
 436         pg_putenv("LC_MESSAGES", lc_messages);
 437
 438         pg_free(lc_collate);
 439         pg_free(lc_ctype);
 440         pg_free(lc_monetary);
 441         pg_free(lc_numeric);
 442         pg_free(lc_time);
 443         pg_free(lang);
 444         pg_free(language);
 445         pg_free(lc_all);
 446         pg_free(lc_messages);
 447
 448         /*
 449          * Before 9.3, pg_resetwal reported the xlogid and segno of the first log
 450          * file after reset as separate lines. Starting with 9.3, it reports the
 451          * WAL file name. If the old cluster is older than 9.3, we construct the
 452          * WAL file name from the xlogid and segno.
 453          */
 454         if (GET_MAJOR_VERSION(cluster->major_version) <= 902)
 455         {
 456                 if (got_tli && got_log_id && got_log_seg)
 457                 {
 458                         snprintf(cluster->controldata.nextxlogfile, 25, "%08X%08X%08X",
 459                                          tli, logid, segno);
 460                         got_nextxlogfile = true;
 461                 }
 462         }
 463
 464         /* verify that we got all the mandatory pg_control data */
 465         if (!got_xid || !got_oid ||
 466                 !got_multi ||
 467                 (!got_oldestmulti &&
 468                  cluster->controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER) ||
 469                 !got_mxoff || (!live_check && !got_nextxlogfile) ||
 470                 !got_float8_pass_by_value || !got_align || !got_blocksz ||
 471                 !got_largesz || !got_walsz || !got_walseg || !got_ident ||
 472                 !got_index || !got_toast ||
 473                 (!got_large_object &&
 474                  cluster->controldata.ctrl_ver >= LARGE_OBJECT_SIZE_PG_CONTROL_VER) ||
 475                 !got_date_is_int || !got_data_checksum_version)
 476         {
 477                 if (cluster == &old_cluster)
 478                         pg_log(PG_REPORT,
 479                                    "The source cluster lacks some required control information:\n");
 480                 else
 481                         pg_log(PG_REPORT,
 482                                    "The target cluster lacks some required control information:\n");
 483
 484                 if (!got_xid)
 485                         pg_log(PG_REPORT, "  checkpoint next XID\n");
 486
 487                 if (!got_oid)
 488                         pg_log(PG_REPORT, "  latest checkpoint next OID\n");
 489
 490                 if (!got_multi)
 491                         pg_log(PG_REPORT, "  latest checkpoint next MultiXactId\n");
 492
 493                 if (!got_oldestmulti &&
 494                         cluster->controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
 495                         pg_log(PG_REPORT, "  latest checkpoint oldest MultiXactId\n");
 496
 497                 if (!got_mxoff)
 498                         pg_log(PG_REPORT, "  latest checkpoint next MultiXactOffset\n");
 499
 500                 if (!live_check && !got_nextxlogfile)
 501                         pg_log(PG_REPORT, "  first WAL segment after reset\n");
 502
 503                 if (!got_float8_pass_by_value)
 504                         pg_log(PG_REPORT, "  float8 argument passing method\n");
 505
 506                 if (!got_align)
 507                         pg_log(PG_REPORT, "  maximum alignment\n");
 508
 509                 if (!got_blocksz)
 510                         pg_log(PG_REPORT, "  block size\n");
 511
 512                 if (!got_largesz)
 513                         pg_log(PG_REPORT, "  large relation segment size\n");
 514
 515                 if (!got_walsz)
 516                         pg_log(PG_REPORT, "  WAL block size\n");
 517
 518                 if (!got_walseg)
 519                         pg_log(PG_REPORT, "  WAL segment size\n");
 520
 521                 if (!got_ident)
 522                         pg_log(PG_REPORT, "  maximum identifier length\n");
 523
 524                 if (!got_index)
 525                         pg_log(PG_REPORT, "  maximum number of indexed columns\n");
 526
 527                 if (!got_toast)
 528                         pg_log(PG_REPORT, "  maximum TOAST chunk size\n");
 529
 530                 if (!got_large_object &&
 531                         cluster->controldata.ctrl_ver >= LARGE_OBJECT_SIZE_PG_CONTROL_VER)
 532                         pg_log(PG_REPORT, "  large-object chunk size\n");
 533
 534                 if (!got_date_is_int)
 535                         pg_log(PG_REPORT, "  dates/times are integers?\n");
 536
 537                 /* value added in Postgres 9.3 */
 538                 if (!got_data_checksum_version)
 539                         pg_log(PG_REPORT, "  data checksum version\n");
 540
 541                 pg_fatal("Cannot continue without required control information, terminating\n");
 542         }
 543 }
 544
 545
 546 /*
 547  * check_control_data()
 548  *
 549  * check to make sure the control data settings are compatible
 550  */
 551 void
 552 check_control_data(ControlData *oldctrl,
 553                                    ControlData *newctrl)
 554 {
 555         if (oldctrl->align == 0 || oldctrl->align != newctrl->align)
 556                 pg_fatal("old and new pg_controldata alignments are invalid or do not match\n"
 557                                  "Likely one cluster is a 32-bit install, the other 64-bit\n");
 558
 559         if (oldctrl->blocksz == 0 || oldctrl->blocksz != newctrl->blocksz)
 560                 pg_fatal("old and new pg_controldata block sizes are invalid or do not match\n");
 561
 562         if (oldctrl->largesz == 0 || oldctrl->largesz != newctrl->largesz)
 563                 pg_fatal("old and new pg_controldata maximum relation segment sizes are invalid or do not match\n");
 564
 565         if (oldctrl->walsz == 0 || oldctrl->walsz != newctrl->walsz)
 566                 pg_fatal("old and new pg_controldata WAL block sizes are invalid or do not match\n");
 567
 568         if (oldctrl->walseg == 0 || oldctrl->walseg != newctrl->walseg)
 569                 pg_fatal("old and new pg_controldata WAL segment sizes are invalid or do not match\n");
 570
 571         if (oldctrl->ident == 0 || oldctrl->ident != newctrl->ident)
 572                 pg_fatal("old and new pg_controldata maximum identifier lengths are invalid or do not match\n");
 573
 574         if (oldctrl->index == 0 || oldctrl->index != newctrl->index)
 575                 pg_fatal("old and new pg_controldata maximum indexed columns are invalid or do not match\n");
 576
 577         if (oldctrl->toast == 0 || oldctrl->toast != newctrl->toast)
 578                 pg_fatal("old and new pg_controldata maximum TOAST chunk sizes are invalid or do not match\n");
 579
 580         /* large_object added in 9.5, so it might not exist in the old cluster */
 581         if (oldctrl->large_object != 0 &&
 582                 oldctrl->large_object != newctrl->large_object)
 583                 pg_fatal("old and new pg_controldata large-object chunk sizes are invalid or do not match\n");
 584
 585         if (oldctrl->date_is_int != newctrl->date_is_int)
 586                 pg_fatal("old and new pg_controldata date/time storage types do not match\n");
 587
 588         /*
 589          * float8_pass_by_value does not need to match, but is used in
 590          * check_for_isn_and_int8_passing_mismatch().
 591          */
 592
 593         /*
 594          * We might eventually allow upgrades from checksum to no-checksum
 595          * clusters.
 596          */
 597         if (oldctrl->data_checksum_version == 0 &&
 598                 newctrl->data_checksum_version != 0)
 599                 pg_fatal("old cluster does not use data checksums but the new one does\n");
 600         else if (oldctrl->data_checksum_version != 0 &&
 601                          newctrl->data_checksum_version == 0)
 602                 pg_fatal("old cluster uses data checksums but the new one does not\n");
 603         else if (oldctrl->data_checksum_version != newctrl->data_checksum_version)
 604                 pg_fatal("old and new cluster pg_controldata checksum versions do not match\n");
 605 }
 606
 607
 608 void
 609 disable_old_cluster(void)
 610 {
 611         char            old_path[MAXPGPATH],
 612                                 new_path[MAXPGPATH];
 613
 614         /* rename pg_control so old server cannot be accidentally started */
 615         prep_status("Adding \".old\" suffix to old global/pg_control");
 616
 617         snprintf(old_path, sizeof(old_path), "%s/global/pg_control", old_cluster.pgdata);
 618         snprintf(new_path, sizeof(new_path), "%s/global/pg_control.old", old_cluster.pgdata);
 619         if (pg_mv_file(old_path, new_path) != 0)
 620                 pg_fatal("Unable to rename %s to %s.\n", old_path, new_path);
 621         check_ok();
 622
 623         pg_log(PG_REPORT, "\n"
 624                    "If you want to start the old cluster, you will need to remove\n"
 625                    "the \".old\" suffix from %s/global/pg_control.old.\n"
 626                    "Because \"link\" mode was used, the old cluster cannot be safely\n"
 627                    "started once the new cluster has been started.\n\n", old_cluster.pgdata);
 628 }