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/*
* relfilenode.c
*
* relfilenode functions
*
* Copyright (c) 2010, PostgreSQL Global Development Group
* $PostgreSQL: pgsql/contrib/pg_upgrade/relfilenode.c,v 1.8 2010/07/06 19:18:55 momjian Exp $
*/
#include "pg_upgrade.h"
#include "catalog/pg_class.h"
#include "access/transam.h"
static void transfer_single_new_db(migratorContext *ctx, pageCnvCtx *pageConverter,
FileNameMap *maps, int size);
static void transfer_relfile(migratorContext *ctx, pageCnvCtx *pageConverter,
const char *fromfile, const char *tofile,
const char *oldnspname, const char *oldrelname,
const char *newnspname, const char *newrelname);
/* used by scandir(), must be global */
char scandir_file_pattern[MAXPGPATH];
/*
* transfer_all_new_dbs()
*
* Responsible for upgrading all database. invokes routines to generate mappings and then
* physically link the databases.
*/
const char *
transfer_all_new_dbs(migratorContext *ctx, DbInfoArr *olddb_arr,
DbInfoArr *newdb_arr, char *old_pgdata, char *new_pgdata)
{
int dbnum;
const char *msg = NULL;
prep_status(ctx, "Restoring user relation files\n");
for (dbnum = 0; dbnum < newdb_arr->ndbs; dbnum++)
{
DbInfo *new_db = &newdb_arr->dbs[dbnum];
DbInfo *old_db = dbarr_lookup_db(olddb_arr, new_db->db_name);
FileNameMap *mappings;
int n_maps;
pageCnvCtx *pageConverter = NULL;
n_maps = 0;
mappings = gen_db_file_maps(ctx, old_db, new_db, &n_maps, old_pgdata,
new_pgdata);
if (n_maps)
{
print_maps(ctx, mappings, n_maps, new_db->db_name);
#ifdef PAGE_CONVERSION
msg = setupPageConverter(ctx, &pageConverter);
#endif
transfer_single_new_db(ctx, pageConverter, mappings, n_maps);
pg_free(mappings);
}
}
prep_status(ctx, ""); /* in case nothing printed */
check_ok(ctx);
return msg;
}
/*
* get_pg_database_relfilenode()
*
* Retrieves the relfilenode for a few system-catalog tables. We need these
* relfilenodes later in the upgrade process.
*/
void
get_pg_database_relfilenode(migratorContext *ctx, Cluster whichCluster)
{
PGconn *conn = connectToServer(ctx, "template1", whichCluster);
PGresult *res;
int i_relfile;
res = executeQueryOrDie(ctx, conn,
"SELECT c.relname, c.relfilenode "
"FROM pg_catalog.pg_class c, "
" pg_catalog.pg_namespace n "
"WHERE c.relnamespace = n.oid AND "
" n.nspname = 'pg_catalog' AND "
" c.relname = 'pg_database' "
"ORDER BY c.relname");
i_relfile = PQfnumber(res, "relfilenode");
if (whichCluster == CLUSTER_OLD)
ctx->old.pg_database_oid = atol(PQgetvalue(res, 0, i_relfile));
else
ctx->new.pg_database_oid = atol(PQgetvalue(res, 0, i_relfile));
PQclear(res);
PQfinish(conn);
}
/*
* transfer_single_new_db()
*
* create links for mappings stored in "maps" array.
*/
static void
transfer_single_new_db(migratorContext *ctx, pageCnvCtx *pageConverter,
FileNameMap *maps, int size)
{
int mapnum;
for (mapnum = 0; mapnum < size; mapnum++)
{
char old_file[MAXPGPATH];
char new_file[MAXPGPATH];
struct dirent **namelist = NULL;
int numFiles;
/* Copying files might take some time, so give feedback. */
snprintf(old_file, sizeof(old_file), "%s/%u", maps[mapnum].old_file, maps[mapnum].old);
snprintf(new_file, sizeof(new_file), "%s/%u", maps[mapnum].new_file, maps[mapnum].new);
pg_log(ctx, PG_REPORT, OVERWRITE_MESSAGE, old_file);
/*
* Copy/link the relation file to the new cluster
*/
unlink(new_file);
transfer_relfile(ctx, pageConverter, old_file, new_file,
maps[mapnum].old_nspname, maps[mapnum].old_relname,
maps[mapnum].new_nspname, maps[mapnum].new_relname);
/* fsm/vm files added in PG 8.4 */
if (GET_MAJOR_VERSION(ctx->old.major_version) >= 804)
{
/*
* Now copy/link any fsm and vm files, if they exist
*/
snprintf(scandir_file_pattern, sizeof(scandir_file_pattern), "%u_", maps[mapnum].old);
numFiles = pg_scandir(ctx, maps[mapnum].old_file, &namelist, dir_matching_filenames);
while (numFiles--)
{
snprintf(old_file, sizeof(old_file), "%s/%s", maps[mapnum].old_file,
namelist[numFiles]->d_name);
snprintf(new_file, sizeof(new_file), "%s/%u%s", maps[mapnum].new_file,
maps[mapnum].new, strchr(namelist[numFiles]->d_name, '_'));
unlink(new_file);
transfer_relfile(ctx, pageConverter, old_file, new_file,
maps[mapnum].old_nspname, maps[mapnum].old_relname,
maps[mapnum].new_nspname, maps[mapnum].new_relname);
pg_free(namelist[numFiles]);
}
pg_free(namelist);
}
/*
* 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, ... 'fsm' and 'vm' files use underscores so are not
* copied.
*/
snprintf(scandir_file_pattern, sizeof(scandir_file_pattern), "%u.", maps[mapnum].old);
numFiles = pg_scandir(ctx, maps[mapnum].old_file, &namelist, dir_matching_filenames);
while (numFiles--)
{
snprintf(old_file, sizeof(old_file), "%s/%s", maps[mapnum].old_file,
namelist[numFiles]->d_name);
snprintf(new_file, sizeof(new_file), "%s/%u%s", maps[mapnum].new_file,
maps[mapnum].new, strchr(namelist[numFiles]->d_name, '.'));
unlink(new_file);
transfer_relfile(ctx, pageConverter, old_file, new_file,
maps[mapnum].old_nspname, maps[mapnum].old_relname,
maps[mapnum].new_nspname, maps[mapnum].new_relname);
pg_free(namelist[numFiles]);
}
pg_free(namelist);
}
}
/*
* transfer_relfile()
*
* Copy or link file from old cluster to new one.
*/
static void
transfer_relfile(migratorContext *ctx, pageCnvCtx *pageConverter, const char *oldfile,
const char *newfile, const char *oldnspname, const char *oldrelname,
const char *newnspname, const char *newrelname)
{
const char *msg;
if ((ctx->transfer_mode == TRANSFER_MODE_LINK) && (pageConverter != NULL))
pg_log(ctx, PG_FATAL, "this migration requires page-by-page conversion, "
"you must use copy-mode instead of link-mode\n");
if (ctx->transfer_mode == TRANSFER_MODE_COPY)
{
pg_log(ctx, PG_INFO, "copying %s to %s\n", oldfile, newfile);
if ((msg = copyAndUpdateFile(ctx, pageConverter, oldfile, newfile, true)) != NULL)
pg_log(ctx, PG_FATAL, "error while copying %s.%s(%s) to %s.%s(%s): %s\n",
oldnspname, oldrelname, oldfile, newnspname, newrelname, newfile, msg);
}
else
{
pg_log(ctx, PG_INFO, "linking %s to %s\n", newfile, oldfile);
if ((msg = linkAndUpdateFile(ctx, pageConverter, oldfile, newfile)) != NULL)
pg_log(ctx, PG_FATAL,
"error while creating link from %s.%s(%s) to %s.%s(%s): %s\n",
oldnspname, oldrelname, oldfile, newnspname, newrelname,
newfile, msg);
}
return;
}
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