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-rw-r--r--src/bin/pg_upgrade/relfilenode.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/src/bin/pg_upgrade/relfilenode.c b/src/bin/pg_upgrade/relfilenode.c
new file mode 100644
index 0000000..4deae7d
--- /dev/null
+++ b/src/bin/pg_upgrade/relfilenode.c
@@ -0,0 +1,271 @@
+/*
+ * relfilenode.c
+ *
+ * relfilenode functions
+ *
+ * Copyright (c) 2010-2021, PostgreSQL Global Development Group
+ * src/bin/pg_upgrade/relfilenode.c
+ */
+
+#include "postgres_fe.h"
+
+#include <sys/stat.h>
+
+#include "access/transam.h"
+#include "catalog/pg_class_d.h"
+#include "pg_upgrade.h"
+
+static void transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace);
+static void transfer_relfile(FileNameMap *map, const char *suffix, bool vm_must_add_frozenbit);
+
+
+/*
+ * transfer_all_new_tablespaces()
+ *
+ * Responsible for upgrading all database. invokes routines to generate mappings and then
+ * physically link the databases.
+ */
+void
+transfer_all_new_tablespaces(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr,
+ char *old_pgdata, char *new_pgdata)
+{
+ switch (user_opts.transfer_mode)
+ {
+ case TRANSFER_MODE_CLONE:
+ pg_log(PG_REPORT, "Cloning user relation files\n");
+ break;
+ case TRANSFER_MODE_COPY:
+ pg_log(PG_REPORT, "Copying user relation files\n");
+ break;
+ case TRANSFER_MODE_LINK:
+ pg_log(PG_REPORT, "Linking user relation files\n");
+ break;
+ }
+
+ /*
+ * Transferring files by tablespace is tricky because a single database
+ * can use multiple tablespaces. For non-parallel mode, we just pass a
+ * NULL tablespace path, which matches all tablespaces. In parallel mode,
+ * we pass the default tablespace and all user-created tablespaces and let
+ * those operations happen in parallel.
+ */
+ if (user_opts.jobs <= 1)
+ parallel_transfer_all_new_dbs(old_db_arr, new_db_arr, old_pgdata,
+ new_pgdata, NULL);
+ else
+ {
+ int tblnum;
+
+ /* transfer default tablespace */
+ parallel_transfer_all_new_dbs(old_db_arr, new_db_arr, old_pgdata,
+ new_pgdata, old_pgdata);
+
+ for (tblnum = 0; tblnum < os_info.num_old_tablespaces; tblnum++)
+ parallel_transfer_all_new_dbs(old_db_arr,
+ new_db_arr,
+ old_pgdata,
+ new_pgdata,
+ os_info.old_tablespaces[tblnum]);
+ /* reap all children */
+ while (reap_child(true) == true)
+ ;
+ }
+
+ end_progress_output();
+ check_ok();
+}
+
+
+/*
+ * transfer_all_new_dbs()
+ *
+ * Responsible for upgrading all database. invokes routines to generate mappings and then
+ * physically link the databases.
+ */
+void
+transfer_all_new_dbs(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr,
+ char *old_pgdata, char *new_pgdata, char *old_tablespace)
+{
+ int old_dbnum,
+ new_dbnum;
+
+ /* Scan the old cluster databases and transfer their files */
+ for (old_dbnum = new_dbnum = 0;
+ old_dbnum < old_db_arr->ndbs;
+ old_dbnum++, new_dbnum++)
+ {
+ DbInfo *old_db = &old_db_arr->dbs[old_dbnum],
+ *new_db = NULL;
+ FileNameMap *mappings;
+ int n_maps;
+
+ /*
+ * Advance past any databases that exist in the new cluster but not in
+ * the old, e.g. "postgres". (The user might have removed the
+ * 'postgres' database from the old cluster.)
+ */
+ for (; new_dbnum < new_db_arr->ndbs; new_dbnum++)
+ {
+ new_db = &new_db_arr->dbs[new_dbnum];
+ if (strcmp(old_db->db_name, new_db->db_name) == 0)
+ break;
+ }
+
+ if (new_dbnum >= new_db_arr->ndbs)
+ pg_fatal("old database \"%s\" not found in the new cluster\n",
+ old_db->db_name);
+
+ mappings = gen_db_file_maps(old_db, new_db, &n_maps, old_pgdata,
+ new_pgdata);
+ if (n_maps)
+ {
+ print_maps(mappings, n_maps, new_db->db_name);
+
+ transfer_single_new_db(mappings, n_maps, old_tablespace);
+ }
+ /* We allocate something even for n_maps == 0 */
+ pg_free(mappings);
+ }
+}
+
+/*
+ * transfer_single_new_db()
+ *
+ * create links for mappings stored in "maps" array.
+ */
+static void
+transfer_single_new_db(FileNameMap *maps, int size, char *old_tablespace)
+{
+ int mapnum;
+ bool vm_crashsafe_match = true;
+ bool vm_must_add_frozenbit = false;
+
+ /*
+ * Do the old and new cluster disagree on the crash-safetiness of the vm
+ * files? If so, do not copy them.
+ */
+ if (old_cluster.controldata.cat_ver < VISIBILITY_MAP_CRASHSAFE_CAT_VER &&
+ new_cluster.controldata.cat_ver >= VISIBILITY_MAP_CRASHSAFE_CAT_VER)
+ vm_crashsafe_match = false;
+
+ /*
+ * Do we need to rewrite visibilitymap?
+ */
+ if (old_cluster.controldata.cat_ver < VISIBILITY_MAP_FROZEN_BIT_CAT_VER &&
+ new_cluster.controldata.cat_ver >= VISIBILITY_MAP_FROZEN_BIT_CAT_VER)
+ vm_must_add_frozenbit = true;
+
+ for (mapnum = 0; mapnum < size; mapnum++)
+ {
+ if (old_tablespace == NULL ||
+ strcmp(maps[mapnum].old_tablespace, old_tablespace) == 0)
+ {
+ /* transfer primary file */
+ transfer_relfile(&maps[mapnum], "", vm_must_add_frozenbit);
+
+ /*
+ * Copy/link any fsm and vm files, if they exist
+ */
+ transfer_relfile(&maps[mapnum], "_fsm", vm_must_add_frozenbit);
+ if (vm_crashsafe_match)
+ transfer_relfile(&maps[mapnum], "_vm", vm_must_add_frozenbit);
+ }
+ }
+}
+
+
+/*
+ * transfer_relfile()
+ *
+ * Copy or link file from old cluster to new one. If vm_must_add_frozenbit
+ * is true, visibility map forks are converted and rewritten, even in link
+ * mode.
+ */
+static void
+transfer_relfile(FileNameMap *map, const char *type_suffix, bool vm_must_add_frozenbit)
+{
+ char old_file[MAXPGPATH];
+ char new_file[MAXPGPATH];
+ int segno;
+ char extent_suffix[65];
+ struct stat statbuf;
+
+ /*
+ * Now copy/link any related segments as well. Remember, PG breaks large
+ * files into 1GB segments, the first segment has no extension, subsequent
+ * segments are named relfilenode.1, relfilenode.2, relfilenode.3.
+ */
+ for (segno = 0;; segno++)
+ {
+ if (segno == 0)
+ extent_suffix[0] = '\0';
+ else
+ snprintf(extent_suffix, sizeof(extent_suffix), ".%d", segno);
+
+ snprintf(old_file, sizeof(old_file), "%s%s/%u/%u%s%s",
+ map->old_tablespace,
+ map->old_tablespace_suffix,
+ map->old_db_oid,
+ map->old_relfilenode,
+ type_suffix,
+ extent_suffix);
+ snprintf(new_file, sizeof(new_file), "%s%s/%u/%u%s%s",
+ map->new_tablespace,
+ map->new_tablespace_suffix,
+ map->new_db_oid,
+ map->new_relfilenode,
+ type_suffix,
+ extent_suffix);
+
+ /* Is it an extent, fsm, or vm file? */
+ if (type_suffix[0] != '\0' || segno != 0)
+ {
+ /* Did file open fail? */
+ if (stat(old_file, &statbuf) != 0)
+ {
+ /* File does not exist? That's OK, just return */
+ if (errno == ENOENT)
+ return;
+ else
+ pg_fatal("error while checking for file existence \"%s.%s\" (\"%s\" to \"%s\"): %s\n",
+ map->nspname, map->relname, old_file, new_file,
+ strerror(errno));
+ }
+
+ /* If file is empty, just return */
+ if (statbuf.st_size == 0)
+ return;
+ }
+
+ unlink(new_file);
+
+ /* Copying files might take some time, so give feedback. */
+ pg_log(PG_STATUS, "%s", old_file);
+
+ if (vm_must_add_frozenbit && strcmp(type_suffix, "_vm") == 0)
+ {
+ /* Need to rewrite visibility map format */
+ pg_log(PG_VERBOSE, "rewriting \"%s\" to \"%s\"\n",
+ old_file, new_file);
+ rewriteVisibilityMap(old_file, new_file, map->nspname, map->relname);
+ }
+ else
+ switch (user_opts.transfer_mode)
+ {
+ case TRANSFER_MODE_CLONE:
+ pg_log(PG_VERBOSE, "cloning \"%s\" to \"%s\"\n",
+ old_file, new_file);
+ cloneFile(old_file, new_file, map->nspname, map->relname);
+ break;
+ case TRANSFER_MODE_COPY:
+ pg_log(PG_VERBOSE, "copying \"%s\" to \"%s\"\n",
+ old_file, new_file);
+ copyFile(old_file, new_file, map->nspname, map->relname);
+ break;
+ case TRANSFER_MODE_LINK:
+ pg_log(PG_VERBOSE, "linking \"%s\" to \"%s\"\n",
+ old_file, new_file);
+ linkFile(old_file, new_file, map->nspname, map->relname);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 20:37:40 +0000