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pg_upgrade.c
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1 /*
2  * pg_upgrade.c
3  *
4  * main source file
5  *
6  * Copyright (c) 2010-2019, PostgreSQL Global Development Group
7  * src/bin/pg_upgrade/pg_upgrade.c
8  */
9 
10 /*
11  * To simplify the upgrade process, we force certain system values to be
12  * identical between old and new clusters:
13  *
14  * We control all assignments of pg_class.oid (and relfilenode) so toast
15  * oids are the same between old and new clusters. This is important
16  * because toast oids are stored as toast pointers in user tables.
17  *
18  * While pg_class.oid and pg_class.relfilenode are initially the same
19  * in a cluster, they can diverge due to CLUSTER, REINDEX, or VACUUM
20  * FULL. In the new cluster, pg_class.oid and pg_class.relfilenode will
21  * be the same and will match the old pg_class.oid value. Because of
22  * this, old/new pg_class.relfilenode values will not match if CLUSTER,
23  * REINDEX, or VACUUM FULL have been performed in the old cluster.
24  *
25  * We control all assignments of pg_type.oid because these oids are stored
26  * in user composite type values.
27  *
28  * We control all assignments of pg_enum.oid because these oids are stored
29  * in user tables as enum values.
30  *
31  * We control all assignments of pg_authid.oid for historical reasons (the
32  * oids used to be stored in pg_largeobject_metadata, which is now copied via
33  * SQL commands), that might change at some point in the future.
34  */
35 
36 
37 
38 #include "postgres_fe.h"
39 
40 #include "pg_upgrade.h"
41 #include "catalog/pg_class_d.h"
42 #include "common/file_perm.h"
43 #include "common/logging.h"
45 #include "fe_utils/string_utils.h"
46 
47 #ifdef HAVE_LANGINFO_H
48 #include <langinfo.h>
49 #endif
50 
51 static void prepare_new_cluster(void);
52 static void prepare_new_globals(void);
53 static void create_new_objects(void);
54 static void copy_xact_xlog_xid(void);
55 static void set_frozenxids(bool minmxid_only);
56 static void setup(char *argv0, bool *live_check);
57 static void cleanup(void);
58 
62 
63 char *output_files[] = {
65 #ifdef WIN32
66  /* unique file for pg_ctl start */
68 #endif
71  NULL
72 };
73 
74 
75 int
76 main(int argc, char **argv)
77 {
78  char *analyze_script_file_name = NULL;
79  char *deletion_script_file_name = NULL;
80  bool live_check = false;
81 
82  pg_logging_init(argv[0]);
83  set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_upgrade"));
84 
85  /* Set default restrictive mask until new cluster permissions are read */
86  umask(PG_MODE_MASK_OWNER);
87 
88  parseCommandLine(argc, argv);
89 
91 
92  adjust_data_dir(&old_cluster);
93  adjust_data_dir(&new_cluster);
94 
95  setup(argv[0], &live_check);
96 
97  output_check_banner(live_check);
98 
100 
101  get_sock_dir(&old_cluster, live_check);
102  get_sock_dir(&new_cluster, false);
103 
104  check_cluster_compatibility(live_check);
105 
106  /* Set mask based on PGDATA permissions */
107  if (!GetDataDirectoryCreatePerm(new_cluster.pgdata))
108  pg_fatal("could not read permissions of directory \"%s\": %s\n",
109  new_cluster.pgdata, strerror(errno));
110 
111  umask(pg_mode_mask);
112 
113  check_and_dump_old_cluster(live_check);
114 
115 
116  /* -- NEW -- */
117  start_postmaster(&new_cluster, true);
118 
121 
123  "\n"
124  "Performing Upgrade\n"
125  "------------------\n");
126 
128 
129  stop_postmaster(false);
130 
131  /*
132  * Destructive Changes to New Cluster
133  */
134 
136 
137  /* New now using xids of the old system */
138 
139  /* -- NEW -- */
140  start_postmaster(&new_cluster, true);
141 
143 
145 
146  stop_postmaster(false);
147 
148  /*
149  * Most failures happen in create_new_objects(), which has completed at
150  * this point. We do this here because it is just before linking, which
151  * will link the old and new cluster data files, preventing the old
152  * cluster from being safely started once the new cluster is started.
153  */
156 
157  transfer_all_new_tablespaces(&old_cluster.dbarr, &new_cluster.dbarr,
158  old_cluster.pgdata, new_cluster.pgdata);
159 
160  /*
161  * Assuming OIDs are only used in system tables, there is no need to
162  * restore the OID counter because we have not transferred any OIDs from
163  * the old system, but we do it anyway just in case. We do it late here
164  * because there is no need to have the schema load use new oids.
165  */
166  prep_status("Setting next OID for new cluster");
167  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
168  "\"%s/pg_resetwal\" -o %u \"%s\"",
169  new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid,
170  new_cluster.pgdata);
171  check_ok();
172 
173  prep_status("Sync data directory to disk");
174  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
175  "\"%s/initdb\" --sync-only \"%s\"", new_cluster.bindir,
176  new_cluster.pgdata);
177  check_ok();
178 
179  create_script_for_cluster_analyze(&analyze_script_file_name);
180  create_script_for_old_cluster_deletion(&deletion_script_file_name);
181 
183 
185  "\n"
186  "Upgrade Complete\n"
187  "----------------\n");
188 
189  output_completion_banner(analyze_script_file_name,
190  deletion_script_file_name);
191 
192  pg_free(analyze_script_file_name);
193  pg_free(deletion_script_file_name);
194 
195  cleanup();
196 
197  return 0;
198 }
199 
200 
201 static void
202 setup(char *argv0, bool *live_check)
203 {
204  /*
205  * make sure the user has a clean environment, otherwise, we may confuse
206  * libpq when we connect to one (or both) of the servers.
207  */
209 
210  /*
211  * In case the user hasn't specified the directory for the new binaries
212  * with -B, default to using the path of the currently executed pg_upgrade
213  * binary.
214  */
215  if (!new_cluster.bindir)
216  {
217  char exec_path[MAXPGPATH];
218 
219  if (find_my_exec(argv0, exec_path) < 0)
220  pg_fatal("%s: could not find own program executable\n", argv0);
221  /* Trim off program name and keep just path */
222  *last_dir_separator(exec_path) = '\0';
223  canonicalize_path(exec_path);
224  new_cluster.bindir = pg_strdup(exec_path);
225  }
226 
228 
229  /* no postmasters should be running, except for a live check */
230  if (pid_lock_file_exists(old_cluster.pgdata))
231  {
232  /*
233  * If we have a postmaster.pid file, try to start the server. If it
234  * starts, the pid file was stale, so stop the server. If it doesn't
235  * start, assume the server is running. If the pid file is left over
236  * from a server crash, this also allows any committed transactions
237  * stored in the WAL to be replayed so they are not lost, because WAL
238  * files are not transferred from old to new servers. We later check
239  * for a clean shutdown.
240  */
241  if (start_postmaster(&old_cluster, false))
242  stop_postmaster(false);
243  else
244  {
245  if (!user_opts.check)
246  pg_fatal("There seems to be a postmaster servicing the old cluster.\n"
247  "Please shutdown that postmaster and try again.\n");
248  else
249  *live_check = true;
250  }
251  }
252 
253  /* same goes for the new postmaster */
254  if (pid_lock_file_exists(new_cluster.pgdata))
255  {
256  if (start_postmaster(&new_cluster, false))
257  stop_postmaster(false);
258  else
259  pg_fatal("There seems to be a postmaster servicing the new cluster.\n"
260  "Please shutdown that postmaster and try again.\n");
261  }
262 }
263 
264 
265 static void
267 {
268  /*
269  * It would make more sense to freeze after loading the schema, but that
270  * would cause us to lose the frozenxids restored by the load. We use
271  * --analyze so autovacuum doesn't update statistics later
272  */
273  prep_status("Analyzing all rows in the new cluster");
274  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
275  "\"%s/vacuumdb\" %s --all --analyze %s",
276  new_cluster.bindir, cluster_conn_opts(&new_cluster),
277  log_opts.verbose ? "--verbose" : "");
278  check_ok();
279 
280  /*
281  * We do freeze after analyze so pg_statistic is also frozen. template0 is
282  * not frozen here, but data rows were frozen by initdb, and we set its
283  * datfrozenxid, relfrozenxids, and relminmxid later to match the new xid
284  * counter later.
285  */
286  prep_status("Freezing all rows in the new cluster");
287  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
288  "\"%s/vacuumdb\" %s --all --freeze %s",
289  new_cluster.bindir, cluster_conn_opts(&new_cluster),
290  log_opts.verbose ? "--verbose" : "");
291  check_ok();
292 }
293 
294 
295 static void
297 {
298  /*
299  * Before we restore anything, set frozenxids of initdb-created tables.
300  */
301  set_frozenxids(false);
302 
303  /*
304  * Now restore global objects (roles and tablespaces).
305  */
306  prep_status("Restoring global objects in the new cluster");
307 
308  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
309  "\"%s/psql\" " EXEC_PSQL_ARGS " %s -f \"%s\"",
310  new_cluster.bindir, cluster_conn_opts(&new_cluster),
312  check_ok();
313 }
314 
315 
316 static void
318 {
319  int dbnum;
320 
321  prep_status("Restoring database schemas in the new cluster\n");
322 
323  /*
324  * We cannot process the template1 database concurrently with others,
325  * because when it's transiently dropped, connection attempts would fail.
326  * So handle it in a separate non-parallelized pass.
327  */
328  for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
329  {
330  char sql_file_name[MAXPGPATH],
331  log_file_name[MAXPGPATH];
332  DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
333  const char *create_opts;
334 
335  /* Process only template1 in this pass */
336  if (strcmp(old_db->db_name, "template1") != 0)
337  continue;
338 
339  pg_log(PG_STATUS, "%s", old_db->db_name);
340  snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
341  snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
342 
343  /*
344  * template1 and postgres databases will already exist in the target
345  * installation, so tell pg_restore to drop and recreate them;
346  * otherwise we would fail to propagate their database-level
347  * properties.
348  */
349  create_opts = "--clean --create";
350 
351  exec_prog(log_file_name,
352  NULL,
353  true,
354  true,
355  "\"%s/pg_restore\" %s %s --exit-on-error --verbose "
356  "--dbname postgres \"%s\"",
357  new_cluster.bindir,
358  cluster_conn_opts(&new_cluster),
359  create_opts,
360  sql_file_name);
361 
362  break; /* done once we've processed template1 */
363  }
364 
365  for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
366  {
367  char sql_file_name[MAXPGPATH],
368  log_file_name[MAXPGPATH];
369  DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
370  const char *create_opts;
371 
372  /* Skip template1 in this pass */
373  if (strcmp(old_db->db_name, "template1") == 0)
374  continue;
375 
376  pg_log(PG_STATUS, "%s", old_db->db_name);
377  snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
378  snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
379 
380  /*
381  * template1 and postgres databases will already exist in the target
382  * installation, so tell pg_restore to drop and recreate them;
383  * otherwise we would fail to propagate their database-level
384  * properties.
385  */
386  if (strcmp(old_db->db_name, "postgres") == 0)
387  create_opts = "--clean --create";
388  else
389  create_opts = "--create";
390 
391  parallel_exec_prog(log_file_name,
392  NULL,
393  "\"%s/pg_restore\" %s %s --exit-on-error --verbose "
394  "--dbname template1 \"%s\"",
395  new_cluster.bindir,
396  cluster_conn_opts(&new_cluster),
397  create_opts,
398  sql_file_name);
399  }
400 
401  /* reap all children */
402  while (reap_child(true) == true)
403  ;
404 
406  check_ok();
407 
408  /*
409  * We don't have minmxids for databases or relations in pre-9.3 clusters,
410  * so set those after we have restored the schema.
411  */
412  if (GET_MAJOR_VERSION(old_cluster.major_version) < 903)
413  set_frozenxids(true);
414 
415  /* update new_cluster info now that we have objects in the databases */
416  get_db_and_rel_infos(&new_cluster);
417 }
418 
419 /*
420  * Delete the given subdirectory contents from the new cluster
421  */
422 static void
423 remove_new_subdir(const char *subdir, bool rmtopdir)
424 {
425  char new_path[MAXPGPATH];
426 
427  prep_status("Deleting files from new %s", subdir);
428 
429  snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, subdir);
430  if (!rmtree(new_path, rmtopdir))
431  pg_fatal("could not delete directory \"%s\"\n", new_path);
432 
433  check_ok();
434 }
435 
436 /*
437  * Copy the files from the old cluster into it
438  */
439 static void
440 copy_subdir_files(const char *old_subdir, const char *new_subdir)
441 {
442  char old_path[MAXPGPATH];
443  char new_path[MAXPGPATH];
444 
445  remove_new_subdir(new_subdir, true);
446 
447  snprintf(old_path, sizeof(old_path), "%s/%s", old_cluster.pgdata, old_subdir);
448  snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, new_subdir);
449 
450  prep_status("Copying old %s to new server", old_subdir);
451 
452  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
453 #ifndef WIN32
454  "cp -Rf \"%s\" \"%s\"",
455 #else
456  /* flags: everything, no confirm, quiet, overwrite read-only */
457  "xcopy /e /y /q /r \"%s\" \"%s\\\"",
458 #endif
459  old_path, new_path);
460 
461  check_ok();
462 }
463 
464 static void
466 {
467  /*
468  * Copy old commit logs to new data dir. pg_clog has been renamed to
469  * pg_xact in post-10 clusters.
470  */
472  "pg_clog" : "pg_xact",
473  GET_MAJOR_VERSION(new_cluster.major_version) < 1000 ?
474  "pg_clog" : "pg_xact");
475 
476  /* set the next transaction id and epoch of the new cluster */
477  prep_status("Setting next transaction ID and epoch for new cluster");
478  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
479  "\"%s/pg_resetwal\" -f -x %u \"%s\"",
480  new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
481  new_cluster.pgdata);
482  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
483  "\"%s/pg_resetwal\" -f -e %u \"%s\"",
484  new_cluster.bindir, old_cluster.controldata.chkpnt_nxtepoch,
485  new_cluster.pgdata);
486  /* must reset commit timestamp limits also */
487  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
488  "\"%s/pg_resetwal\" -f -c %u,%u \"%s\"",
489  new_cluster.bindir,
490  old_cluster.controldata.chkpnt_nxtxid,
491  old_cluster.controldata.chkpnt_nxtxid,
492  new_cluster.pgdata);
493  check_ok();
494 
495  /*
496  * If the old server is before the MULTIXACT_FORMATCHANGE_CAT_VER change
497  * (see pg_upgrade.h) and the new server is after, then we don't copy
498  * pg_multixact files, but we need to reset pg_control so that the new
499  * server doesn't attempt to read multis older than the cutoff value.
500  */
503  {
504  copy_subdir_files("pg_multixact/offsets", "pg_multixact/offsets");
505  copy_subdir_files("pg_multixact/members", "pg_multixact/members");
506 
507  prep_status("Setting next multixact ID and offset for new cluster");
508 
509  /*
510  * we preserve all files and contents, so we must preserve both "next"
511  * counters here and the oldest multi present on system.
512  */
513  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
514  "\"%s/pg_resetwal\" -O %u -m %u,%u \"%s\"",
515  new_cluster.bindir,
516  old_cluster.controldata.chkpnt_nxtmxoff,
517  old_cluster.controldata.chkpnt_nxtmulti,
518  old_cluster.controldata.chkpnt_oldstMulti,
519  new_cluster.pgdata);
520  check_ok();
521  }
522  else if (new_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
523  {
524  /*
525  * Remove offsets/0000 file created by initdb that no longer matches
526  * the new multi-xid value. "members" starts at zero so no need to
527  * remove it.
528  */
529  remove_new_subdir("pg_multixact/offsets", false);
530 
531  prep_status("Setting oldest multixact ID in new cluster");
532 
533  /*
534  * We don't preserve files in this case, but it's important that the
535  * oldest multi is set to the latest value used by the old system, so
536  * that multixact.c returns the empty set for multis that might be
537  * present on disk. We set next multi to the value following that; it
538  * might end up wrapped around (i.e. 0) if the old cluster had
539  * next=MaxMultiXactId, but multixact.c can cope with that just fine.
540  */
541  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
542  "\"%s/pg_resetwal\" -m %u,%u \"%s\"",
543  new_cluster.bindir,
544  old_cluster.controldata.chkpnt_nxtmulti + 1,
545  old_cluster.controldata.chkpnt_nxtmulti,
546  new_cluster.pgdata);
547  check_ok();
548  }
549 
550  /* now reset the wal archives in the new cluster */
551  prep_status("Resetting WAL archives");
552  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
553  /* use timeline 1 to match controldata and no WAL history file */
554  "\"%s/pg_resetwal\" -l 00000001%s \"%s\"", new_cluster.bindir,
555  old_cluster.controldata.nextxlogfile + 8,
556  new_cluster.pgdata);
557  check_ok();
558 }
559 
560 
561 /*
562  * set_frozenxids()
563  *
564  * This is called on the new cluster before we restore anything, with
565  * minmxid_only = false. Its purpose is to ensure that all initdb-created
566  * vacuumable tables have relfrozenxid/relminmxid matching the old cluster's
567  * xid/mxid counters. We also initialize the datfrozenxid/datminmxid of the
568  * built-in databases to match.
569  *
570  * As we create user tables later, their relfrozenxid/relminmxid fields will
571  * be restored properly by the binary-upgrade restore script. Likewise for
572  * user-database datfrozenxid/datminmxid. However, if we're upgrading from a
573  * pre-9.3 database, which does not store per-table or per-DB minmxid, then
574  * the relminmxid/datminmxid values filled in by the restore script will just
575  * be zeroes.
576  *
577  * Hence, with a pre-9.3 source database, a second call occurs after
578  * everything is restored, with minmxid_only = true. This pass will
579  * initialize all tables and databases, both those made by initdb and user
580  * objects, with the desired minmxid value. frozenxid values are left alone.
581  */
582 static void
583 set_frozenxids(bool minmxid_only)
584 {
585  int dbnum;
586  PGconn *conn,
587  *conn_template1;
588  PGresult *dbres;
589  int ntups;
590  int i_datname;
591  int i_datallowconn;
592 
593  if (!minmxid_only)
594  prep_status("Setting frozenxid and minmxid counters in new cluster");
595  else
596  prep_status("Setting minmxid counter in new cluster");
597 
598  conn_template1 = connectToServer(&new_cluster, "template1");
599 
600  if (!minmxid_only)
601  /* set pg_database.datfrozenxid */
602  PQclear(executeQueryOrDie(conn_template1,
603  "UPDATE pg_catalog.pg_database "
604  "SET datfrozenxid = '%u'",
605  old_cluster.controldata.chkpnt_nxtxid));
606 
607  /* set pg_database.datminmxid */
608  PQclear(executeQueryOrDie(conn_template1,
609  "UPDATE pg_catalog.pg_database "
610  "SET datminmxid = '%u'",
611  old_cluster.controldata.chkpnt_nxtmulti));
612 
613  /* get database names */
614  dbres = executeQueryOrDie(conn_template1,
615  "SELECT datname, datallowconn "
616  "FROM pg_catalog.pg_database");
617 
618  i_datname = PQfnumber(dbres, "datname");
619  i_datallowconn = PQfnumber(dbres, "datallowconn");
620 
621  ntups = PQntuples(dbres);
622  for (dbnum = 0; dbnum < ntups; dbnum++)
623  {
624  char *datname = PQgetvalue(dbres, dbnum, i_datname);
625  char *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
626 
627  /*
628  * We must update databases where datallowconn = false, e.g.
629  * template0, because autovacuum increments their datfrozenxids,
630  * relfrozenxids, and relminmxid even if autovacuum is turned off, and
631  * even though all the data rows are already frozen. To enable this,
632  * we temporarily change datallowconn.
633  */
634  if (strcmp(datallowconn, "f") == 0)
635  PQclear(executeQueryOrDie(conn_template1,
636  "ALTER DATABASE %s ALLOW_CONNECTIONS = true",
637  quote_identifier(datname)));
638 
639  conn = connectToServer(&new_cluster, datname);
640 
641  if (!minmxid_only)
642  /* set pg_class.relfrozenxid */
644  "UPDATE pg_catalog.pg_class "
645  "SET relfrozenxid = '%u' "
646  /* only heap, materialized view, and TOAST are vacuumed */
647  "WHERE relkind IN ("
648  CppAsString2(RELKIND_RELATION) ", "
649  CppAsString2(RELKIND_MATVIEW) ", "
650  CppAsString2(RELKIND_TOASTVALUE) ")",
651  old_cluster.controldata.chkpnt_nxtxid));
652 
653  /* set pg_class.relminmxid */
655  "UPDATE pg_catalog.pg_class "
656  "SET relminmxid = '%u' "
657  /* only heap, materialized view, and TOAST are vacuumed */
658  "WHERE relkind IN ("
659  CppAsString2(RELKIND_RELATION) ", "
660  CppAsString2(RELKIND_MATVIEW) ", "
661  CppAsString2(RELKIND_TOASTVALUE) ")",
662  old_cluster.controldata.chkpnt_nxtmulti));
663  PQfinish(conn);
664 
665  /* Reset datallowconn flag */
666  if (strcmp(datallowconn, "f") == 0)
667  PQclear(executeQueryOrDie(conn_template1,
668  "ALTER DATABASE %s ALLOW_CONNECTIONS = false",
669  quote_identifier(datname)));
670  }
671 
672  PQclear(dbres);
673 
674  PQfinish(conn_template1);
675 
676  check_ok();
677 }
678 
679 
680 static void
681 cleanup(void)
682 {
683  fclose(log_opts.internal);
684 
685  /* Remove dump and log files? */
686  if (!log_opts.retain)
687  {
688  int dbnum;
689  char **filename;
690 
691  for (filename = output_files; *filename != NULL; filename++)
692  unlink(*filename);
693 
694  /* remove dump files */
695  unlink(GLOBALS_DUMP_FILE);
696 
697  if (old_cluster.dbarr.dbs)
698  for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
699  {
700  char sql_file_name[MAXPGPATH],
701  log_file_name[MAXPGPATH];
702  DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
703 
704  snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
705  unlink(sql_file_name);
706 
707  snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
708  unlink(log_file_name);
709  }
710  }
711 }
void transfer_all_new_tablespaces(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata)
Definition: relfilenode.c:30
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Definition: parallel.c:63
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