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/*
* relfilenumber.c
*
* relfilenumber functions
*
* Copyright (c) 2010-2023, PostgreSQL Global Development Group
* src/bin/pg_upgrade/relfilenumber.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 *type_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:
prep_status_progress("Cloning user relation files");
break;
case TRANSFER_MODE_COPY:
prep_status_progress("Copying user relation files");
break;
case TRANSFER_MODE_LINK:
prep_status_progress("Linking user relation files");
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",
old_db->db_name);
mappings = gen_db_file_maps(old_db, new_db, &n_maps, old_pgdata,
new_pgdata);
if (n_maps)
{
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_must_add_frozenbit = 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);
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 relfilenumber.1, relfilenumber.2, relfilenumber.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->db_oid,
map->relfilenumber,
type_suffix,
extent_suffix);
snprintf(new_file, sizeof(new_file), "%s%s/%u/%u%s%s",
map->new_tablespace,
map->new_tablespace_suffix,
map->db_oid,
map->relfilenumber,
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",
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\"",
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\"",
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\"",
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\"",
old_file, new_file);
linkFile(old_file, new_file, map->nspname, map->relname);
}
}
}
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