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https://git.postgresql.org/git/postgresql.git
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244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
/*
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* relfilenode.c
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*
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* relfilenode functions
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*
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* Copyright (c) 2010-2012, PostgreSQL Global Development Group
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* contrib/pg_upgrade/relfilenode.c
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*/
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#include "postgres.h"
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#include "pg_upgrade.h"
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#include "catalog/pg_class.h"
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#include "access/transam.h"
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static void transfer_single_new_db(pageCnvCtx *pageConverter,
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FileNameMap *maps, int size);
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static void transfer_relfile(pageCnvCtx *pageConverter, FileNameMap *map,
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const char *suffix);
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/*
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* transfer_all_new_dbs()
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*
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* Responsible for upgrading all database. invokes routines to generate mappings and then
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* physically link the databases.
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*/
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const char *
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transfer_all_new_dbs(DbInfoArr *old_db_arr,
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DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata)
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{
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int old_dbnum,
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new_dbnum;
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const char *msg = NULL;
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pg_log(PG_REPORT, "%s user relation files\n",
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user_opts.transfer_mode == TRANSFER_MODE_LINK ? "Linking" : "Copying");
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/* Scan the old cluster databases and transfer their files */
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for (old_dbnum = new_dbnum = 0;
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old_dbnum < old_db_arr->ndbs;
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old_dbnum++, new_dbnum++)
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{
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DbInfo *old_db = &old_db_arr->dbs[old_dbnum],
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*new_db = NULL;
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FileNameMap *mappings;
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int n_maps;
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pageCnvCtx *pageConverter = NULL;
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/*
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* Advance past any databases that exist in the new cluster but not in
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* the old, e.g. "postgres". (The user might have removed the
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* 'postgres' database from the old cluster.)
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*/
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for (; new_dbnum < new_db_arr->ndbs; new_dbnum++)
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{
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new_db = &new_db_arr->dbs[new_dbnum];
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if (strcmp(old_db->db_name, new_db->db_name) == 0)
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break;
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}
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if (new_dbnum >= new_db_arr->ndbs)
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pg_log(PG_FATAL, "old database \"%s\" not found in the new cluster\n",
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old_db->db_name);
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n_maps = 0;
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mappings = gen_db_file_maps(old_db, new_db, &n_maps, old_pgdata,
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new_pgdata);
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if (n_maps)
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{
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print_maps(mappings, n_maps, new_db->db_name);
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#ifdef PAGE_CONVERSION
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msg = setupPageConverter(&pageConverter);
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#endif
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transfer_single_new_db(pageConverter, mappings, n_maps);
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pg_free(mappings);
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}
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}
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prep_status(" "); /* in case nothing printed; pass a space so
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* gcc doesn't complain about empty format
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* string */
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check_ok();
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return msg;
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}
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/*
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* get_pg_database_relfilenode()
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*
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* Retrieves the relfilenode for a few system-catalog tables. We need these
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* relfilenodes later in the upgrade process.
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*/
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void
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get_pg_database_relfilenode(ClusterInfo *cluster)
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{
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PGconn *conn = connectToServer(cluster, "template1");
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PGresult *res;
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int i_relfile;
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res = executeQueryOrDie(conn,
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"SELECT c.relname, c.relfilenode "
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"FROM pg_catalog.pg_class c, "
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" pg_catalog.pg_namespace n "
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"WHERE c.relnamespace = n.oid AND "
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" n.nspname = 'pg_catalog' AND "
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" c.relname = 'pg_database' "
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"ORDER BY c.relname");
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i_relfile = PQfnumber(res, "relfilenode");
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cluster->pg_database_oid = atooid(PQgetvalue(res, 0, i_relfile));
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PQclear(res);
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PQfinish(conn);
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}
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/*
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* transfer_single_new_db()
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*
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* create links for mappings stored in "maps" array.
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*/
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static void
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transfer_single_new_db(pageCnvCtx *pageConverter,
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FileNameMap *maps, int size)
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{
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int mapnum;
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bool vm_crashsafe_match = true;
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/*
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* Do the old and new cluster disagree on the crash-safetiness of the vm
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* files? If so, do not copy them.
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*/
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if (old_cluster.controldata.cat_ver < VISIBILITY_MAP_CRASHSAFE_CAT_VER &&
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new_cluster.controldata.cat_ver >= VISIBILITY_MAP_CRASHSAFE_CAT_VER)
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vm_crashsafe_match = false;
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for (mapnum = 0; mapnum < size; mapnum++)
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{
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/* transfer primary file */
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transfer_relfile(pageConverter, &maps[mapnum], "");
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/* fsm/vm files added in PG 8.4 */
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if (GET_MAJOR_VERSION(old_cluster.major_version) >= 804)
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{
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/*
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* Copy/link any fsm and vm files, if they exist
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*/
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transfer_relfile(pageConverter, &maps[mapnum], "_fsm");
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if (vm_crashsafe_match)
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transfer_relfile(pageConverter, &maps[mapnum], "_vm");
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}
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}
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}
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/*
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* transfer_relfile()
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*
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* Copy or link file from old cluster to new one.
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*/
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static void
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transfer_relfile(pageCnvCtx *pageConverter, FileNameMap *map,
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const char *type_suffix)
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{
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const char *msg;
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char old_file[MAXPGPATH];
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char new_file[MAXPGPATH];
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int fd;
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int segno;
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char extent_suffix[65];
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/*
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* Now copy/link any related segments as well. Remember, PG breaks
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* large files into 1GB segments, the first segment has no extension,
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* subsequent segments are named relfilenode.1, relfilenode.2,
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* relfilenode.3.
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* copied.
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*/
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for (segno = 0;; segno++)
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{
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if (segno == 0)
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extent_suffix[0] = '\0';
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else
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snprintf(extent_suffix, sizeof(extent_suffix), ".%d", segno);
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snprintf(old_file, sizeof(old_file), "%s/%u%s%s", map->old_dir,
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map->old_relfilenode, type_suffix, extent_suffix);
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snprintf(new_file, sizeof(new_file), "%s/%u%s%s", map->new_dir,
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map->new_relfilenode, type_suffix, extent_suffix);
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/* Is it an extent, fsm, or vm file? */
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if (type_suffix[0] != '\0' || segno != 0)
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{
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/* Did file open fail? */
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if ((fd = open(old_file, O_RDONLY, 0)) == -1)
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{
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/* File does not exist? That's OK, just return */
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if (errno == ENOENT)
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return;
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else
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pg_log(PG_FATAL, "non-existant file error while copying relation \"%s.%s\" (\"%s\" to \"%s\")\n",
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map->nspname, map->relname, old_file, new_file);
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}
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close(fd);
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}
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unlink(new_file);
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/* Copying files might take some time, so give feedback. */
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pg_log(PG_REPORT, OVERWRITE_MESSAGE, old_file);
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if ((user_opts.transfer_mode == TRANSFER_MODE_LINK) && (pageConverter != NULL))
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pg_log(PG_FATAL, "This upgrade requires page-by-page conversion, "
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"you must use copy mode instead of link mode.\n");
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if (user_opts.transfer_mode == TRANSFER_MODE_COPY)
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{
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pg_log(PG_VERBOSE, "copying \"%s\" to \"%s\"\n", old_file, new_file);
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if ((msg = copyAndUpdateFile(pageConverter, old_file, new_file, true)) != NULL)
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pg_log(PG_FATAL, "error while copying relation \"%s.%s\" (\"%s\" to \"%s\"): %s\n",
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map->nspname, map->relname, old_file, new_file, msg);
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}
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else
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{
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pg_log(PG_VERBOSE, "linking \"%s\" to \"%s\"\n", old_file, new_file);
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if ((msg = linkAndUpdateFile(pageConverter, old_file, new_file)) != NULL)
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pg_log(PG_FATAL,
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"error while creating link for relation \"%s.%s\" (\"%s\" to \"%s\"): %s\n",
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map->nspname, map->relname, old_file, new_file, msg);
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}
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}
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return;
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}
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