* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.

/* $NetBSD: vgrename.c,v 1.1.1.3 2009/12/02 00:25:58 haad Exp $ */

/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include "tools.h"

static struct volume_group *vg_rename_old(struct cmd_context *cmd,
const char *vg_name_old,
const char *vgid)
{
struct volume_group *vg;

/* FIXME we used to print an error about EXPORTED, but proceeded
nevertheless. */
vg = vg_read_for_update(cmd, vg_name_old, vgid, READ_ALLOW_EXPORTED);
if (vg_read_error(vg)) {
vg_release(vg);
return_NULL;
}

if (lvs_in_vg_activated_by_uuid_only(vg)) {
unlock_and_release_vg(cmd, vg, vg_name_old);
log_error("Volume group \"%s\" still has active LVs",
vg_name_old);
/* FIXME Remove this restriction */
return NULL;
}
return vg;
}

static int vg_rename_new(struct cmd_context *cmd,
const char *vg_name_new)
{
int rc;

log_verbose("Checking for new volume group \"%s\"", vg_name_new);

rc = vg_lock_newname(cmd, vg_name_new);

if (rc == FAILED_LOCKING) {
log_error("Can't get lock for %s", vg_name_new);
return 0;
}

if (rc == FAILED_EXIST) {
log_error("New volume group \"%s\" already exists",
vg_name_new);
return 0;
}
return 1;
}

static int vg_rename_path(struct cmd_context *cmd, const char *old_vg_path,
const char *new_vg_path)
{
char *dev_dir;
struct id id;
int match = 0;
int found_id = 0;
struct dm_list *vgids;
struct str_list *sl;
char *vg_name_new;
const char *vgid = NULL, *vg_name, *vg_name_old;
char old_path[NAME_LEN], new_path[NAME_LEN];
struct volume_group *vg = NULL;
int lock_vg_old_first = 1;

vg_name_old = skip_dev_dir(cmd, old_vg_path, NULL);
vg_name_new = skip_dev_dir(cmd, new_vg_path, NULL);

dev_dir = cmd->dev_dir;

if (!validate_vg_rename_params(cmd, vg_name_old, vg_name_new))
return 0;

log_verbose("Checking for existing volume group \"%s\"", vg_name_old);

/* Avoid duplicates */
if (!(vgids = get_vgids(cmd, 0)) || dm_list_empty(vgids)) {
log_error("No complete volume groups found");
return 0;
}

dm_list_iterate_items(sl, vgids) {
vgid = sl->str;
if (!vgid || !(vg_name = vgname_from_vgid(NULL, vgid)) ||
is_orphan_vg(vg_name))
continue;
if (!strcmp(vg_name, vg_name_old)) {
if (match) {
log_error("Found more than one VG called %s. "
"Please supply VG uuid.", vg_name_old);
return 0;
}
match = 1;
}
}

log_suppress(2);
found_id = id_read_format(&id, vg_name_old);
log_suppress(0);
if (found_id && (vg_name = vgname_from_vgid(cmd->mem, (char *)id.uuid))) {
vg_name_old = vg_name;
vgid = (char *)id.uuid;
} else
vgid = NULL;

if (strcmp(vg_name_new, vg_name_old) < 0)
lock_vg_old_first = 0;

if (lock_vg_old_first) {
vg = vg_rename_old(cmd, vg_name_old, vgid);
if (!vg)
return 0;

if (!vg_rename_new(cmd, vg_name_new)) {
unlock_and_release_vg(cmd, vg, vg_name_old);
return 0;
}
} else {
if (!vg_rename_new(cmd, vg_name_new)) {
return 0;
}

vg = vg_rename_old(cmd, vg_name_old, vgid);
if (!vg)
return 0;
}

if (!archive(vg))
goto error;

/* Remove references based on old name */
drop_cached_metadata(vg);

/* Change the volume group name */
vg_rename(cmd, vg, vg_name_new);

/* store it on disks */
log_verbose("Writing out updated volume group");
if (!vg_write(vg) || !vg_commit(vg)) {
goto error;
}

sprintf(old_path, "%s%s", dev_dir, vg_name_old);
sprintf(new_path, "%s%s", dev_dir, vg_name_new);

if (activation() && dir_exists(old_path)) {
log_verbose("Renaming \"%s\" to \"%s\"", old_path, new_path);

if (test_mode())
log_verbose("Test mode: Skipping rename.");

else if (lvs_in_vg_activated_by_uuid_only(vg)) {
if (!vg_refresh_visible(cmd, vg)) {
log_error("Renaming \"%s\" to \"%s\" failed",
old_path, new_path);
goto error;
}
}
}

/******* FIXME Rename any active LVs! *****/

backup(vg);
backup_remove(cmd, vg_name_old);

unlock_vg(cmd, vg_name_new);
unlock_and_release_vg(cmd, vg, vg_name_old);

log_print("Volume group \"%s\" successfully renamed to \"%s\"",
vg_name_old, vg_name_new);

/* FIXME lvmcache corruption - vginfo duplicated instead of renamed */
persistent_filter_wipe(cmd->filter);
lvmcache_destroy(cmd, 1);

return 1;

error:
if (lock_vg_old_first) {
unlock_vg(cmd, vg_name_new);
unlock_and_release_vg(cmd, vg, vg_name_old);
} else {
unlock_and_release_vg(cmd, vg, vg_name_old);
unlock_vg(cmd, vg_name_new);
}
return 0;
}

int vgrename(struct cmd_context *cmd, int argc, char **argv)
{
if (argc != 2) {
log_error("Old and new volume group names need specifying");
return EINVALID_CMD_LINE;
}

if (!vg_rename_path(cmd, argv[0], argv[1])) {
stack;
return ECMD_FAILED;
}

return ECMD_PROCESSED;
}