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230 lines
6.6 KiB
C
230 lines
6.6 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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* $PostgreSQL: pgsql/contrib/pg_upgrade/relfilenode.c,v 1.5 2010/07/03 14:23:13 momjian Exp $
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*/
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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(migratorContext *ctx, pageCnvCtx *pageConverter,
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FileNameMap *maps, int size);
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static void transfer_relfile(migratorContext *ctx, pageCnvCtx *pageConverter,
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const char *fromfile, const char *tofile,
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const char *oldnspname, const char *oldrelname,
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const char *newnspname, const char *newrelname);
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/* used by scandir(), must be global */
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char scandir_file_pattern[MAXPGPATH];
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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(migratorContext *ctx, DbInfoArr *olddb_arr,
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DbInfoArr *newdb_arr, char *old_pgdata, char *new_pgdata)
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{
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int dbnum;
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const char *msg = NULL;
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prep_status(ctx, "Restoring user relation files\n");
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for (dbnum = 0; dbnum < newdb_arr->ndbs; dbnum++)
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{
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DbInfo *new_db = &newdb_arr->dbs[dbnum];
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DbInfo *old_db = dbarr_lookup_db(olddb_arr, new_db->db_name);
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FileNameMap *mappings;
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int n_maps;
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pageCnvCtx *pageConverter = NULL;
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n_maps = 0;
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mappings = gen_db_file_maps(ctx, 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(ctx, mappings, n_maps, new_db->db_name);
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#ifdef PAGE_CONVERSION
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msg = setupPageConverter(ctx, &pageConverter);
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#endif
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transfer_single_new_db(ctx, 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(ctx, ""); /* in case nothing printed */
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check_ok(ctx);
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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(migratorContext *ctx, Cluster whichCluster)
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{
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PGconn *conn = connectToServer(ctx, "template1", whichCluster);
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PGresult *res;
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int i_relfile;
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res = executeQueryOrDie(ctx, 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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if (whichCluster == CLUSTER_OLD)
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ctx->old.pg_database_oid = atol(PQgetvalue(res, 0, i_relfile));
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else
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ctx->new.pg_database_oid = atol(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(migratorContext *ctx, pageCnvCtx *pageConverter,
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FileNameMap *maps, int size)
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{
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int mapnum;
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for (mapnum = 0; mapnum < size; mapnum++)
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{
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char old_file[MAXPGPATH];
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char new_file[MAXPGPATH];
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struct dirent **namelist = NULL;
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int numFiles;
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/* Copying files might take some time, so give feedback. */
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snprintf(old_file, sizeof(old_file), "%s/%u", maps[mapnum].old_file, maps[mapnum].old);
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snprintf(new_file, sizeof(new_file), "%s/%u", maps[mapnum].new_file, maps[mapnum].new);
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pg_log(ctx, PG_REPORT, OVERWRITE_MESSAGE, old_file);
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/*
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* Copy/link the relation file to the new cluster
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*/
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unlink(new_file);
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transfer_relfile(ctx, pageConverter, old_file, new_file,
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maps[mapnum].old_nspname, maps[mapnum].old_relname,
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maps[mapnum].new_nspname, maps[mapnum].new_relname);
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/* fsm/vm files added in PG 8.4 */
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if (GET_MAJOR_VERSION(ctx->old.major_version) >= 804)
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{
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/*
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* Now copy/link any fsm and vm files, if they exist
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*/
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snprintf(scandir_file_pattern, sizeof(scandir_file_pattern), "%u_", maps[mapnum].old);
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numFiles = pg_scandir(ctx, maps[mapnum].old_file, &namelist, dir_matching_filenames);
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while (numFiles--)
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{
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snprintf(old_file, sizeof(old_file), "%s/%s", maps[mapnum].old_file,
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namelist[numFiles]->d_name);
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snprintf(new_file, sizeof(new_file), "%s/%u%s", maps[mapnum].new_file,
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maps[mapnum].new, strchr(namelist[numFiles]->d_name, '_'));
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unlink(new_file);
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transfer_relfile(ctx, pageConverter, old_file, new_file,
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maps[mapnum].old_nspname, maps[mapnum].old_relname,
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maps[mapnum].new_nspname, maps[mapnum].new_relname);
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pg_free(namelist[numFiles]);
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}
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pg_free(namelist);
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}
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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, ... 'fsm' and 'vm' files use underscores so are not
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* copied.
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*/
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snprintf(scandir_file_pattern, sizeof(scandir_file_pattern), "%u.", maps[mapnum].old);
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numFiles = pg_scandir(ctx, maps[mapnum].old_file, &namelist, dir_matching_filenames);
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while (numFiles--)
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{
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snprintf(old_file, sizeof(old_file), "%s/%s", maps[mapnum].old_file,
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namelist[numFiles]->d_name);
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snprintf(new_file, sizeof(new_file), "%s/%u%s", maps[mapnum].new_file,
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maps[mapnum].new, strchr(namelist[numFiles]->d_name, '.'));
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unlink(new_file);
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transfer_relfile(ctx, pageConverter, old_file, new_file,
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maps[mapnum].old_nspname, maps[mapnum].old_relname,
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maps[mapnum].new_nspname, maps[mapnum].new_relname);
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pg_free(namelist[numFiles]);
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}
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pg_free(namelist);
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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(migratorContext *ctx, pageCnvCtx *pageConverter, const char *oldfile,
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const char *newfile, const char *oldnspname, const char *oldrelname,
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const char *newnspname, const char *newrelname)
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{
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const char *msg;
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if ((ctx->transfer_mode == TRANSFER_MODE_LINK) && (pageConverter != NULL))
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pg_log(ctx, PG_FATAL, "this migration requires page-by-page conversion, "
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"you must use copy-mode instead of link-mode\n");
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if (ctx->transfer_mode == TRANSFER_MODE_COPY)
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{
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pg_log(ctx, PG_INFO, "copying %s to %s\n", oldfile, newfile);
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if ((msg = copyAndUpdateFile(ctx, pageConverter, oldfile, newfile, true)) != NULL)
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pg_log(ctx, PG_FATAL, "error while copying %s.%s(%s) to %s.%s(%s): %s\n",
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oldnspname, oldrelname, oldfile, newnspname, newrelname, newfile, msg);
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}
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else
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{
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pg_log(ctx, PG_INFO, "linking %s to %s\n", newfile, oldfile);
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if ((msg = linkAndUpdateFile(ctx, pageConverter, oldfile, newfile)) != NULL)
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pg_log(ctx, PG_FATAL,
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"error while creating link from %s.%s(%s) to %s.%s(%s): %s\n",
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oldnspname, oldrelname, oldfile, newnspname, newrelname,
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newfile, msg);
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}
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return;
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}
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