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/*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "tools.h"
static struct volume_group *_vgmerge_vg_read(struct cmd_context *cmd,
const char *vg_name)
{
struct volume_group *vg;
log_verbose("Checking for volume group \"%s\"", vg_name);
vg = vg_read_for_update(cmd, vg_name, NULL, 0, 0);
if (!vg)
return NULL;
if (vg_is_shared(vg)) {
log_error("vgmerge not allowed for lock_type %s", vg->lock_type);
unlock_and_release_vg(cmd, vg, vg_name);
return NULL;
}
return vg;
}
/* Select bigger pool metadata spare volume */
static int _vgmerge_select_pool_metadata_spare(struct cmd_context *cmd,
struct volume_group *vg_to,
struct volume_group *vg_from)
{
struct volume_group *svg;
if (!vg_to->pool_metadata_spare_lv ||
!vg_from->pool_metadata_spare_lv)
return 1; /* no problem */
/* Drop smaller pool metadata spare */
svg = (vg_to->pool_metadata_spare_lv->le_count <
vg_from->pool_metadata_spare_lv->le_count) ? vg_to : vg_from;
vg_remove_pool_metadata_spare(svg);
/* Re-test lv name compatibility */
if (!vgs_are_compatible(cmd, vg_from, vg_to))
return_0;
return 1;
}
static int _vgmerge_single(struct cmd_context *cmd, const char *vg_name_to,
const char *vg_name_from)
{
struct pv_list *pvl, *tpvl;
struct volume_group *vg_to, *vg_from;
struct lv_list *lvl1, *lvl2;
int r = ECMD_FAILED;
int lock_vg_from_first = 0;
struct logical_volume *lv;
int poolmetadataspare = arg_int_value(cmd, poolmetadataspare_ARG, DEFAULT_POOL_METADATA_SPARE);
if (!strcmp(vg_name_to, vg_name_from)) {
log_error("Duplicate volume group name \"%s\"", vg_name_from);
return ECMD_FAILED;
}
if (!lvmcache_label_scan(cmd))
return_ECMD_FAILED;
if (strcmp(vg_name_to, vg_name_from) > 0)
lock_vg_from_first = 1;
if (lock_vg_from_first) {
if (!(vg_from = _vgmerge_vg_read(cmd, vg_name_from)))
return_ECMD_FAILED;
if (!(vg_to = _vgmerge_vg_read(cmd, vg_name_to))) {
unlock_and_release_vg(cmd, vg_from, vg_name_from);
return_ECMD_FAILED;
}
} else {
if (!(vg_to = _vgmerge_vg_read(cmd, vg_name_to)))
return_ECMD_FAILED;
if (!(vg_from = _vgmerge_vg_read(cmd, vg_name_from))) {
unlock_and_release_vg(cmd, vg_to, vg_name_to);
return_ECMD_FAILED;
}
}
if (vg_from->pool_metadata_spare_lv &&
vg_to->pool_metadata_spare_lv) {
if (vg_from->pool_metadata_spare_lv->le_count >
vg_to->pool_metadata_spare_lv->le_count)
/* Preserve bigger pmspare from VG_FROM */
lv = vg_to->pool_metadata_spare_lv;
else
lv = vg_from->pool_metadata_spare_lv;
log_debug_metadata("Removing pool metadata spare %s.", display_lvname(lv));
if (!lv_remove_single(cmd, lv, DONT_PROMPT, 0))
return_ECMD_FAILED;
}
if (!vgs_are_compatible(cmd, vg_from, vg_to))
goto_bad;
/* FIXME List arg: vg_show_with_pv_and_lv(vg_to); */
if (!archive(vg_from) || !archive(vg_to))
goto_bad;
if (!_vgmerge_select_pool_metadata_spare(cmd, vg_to, vg_from))
goto_bad;
/* Merge volume groups */
dm_list_iterate_items_safe(pvl, tpvl, &vg_from->pvs) {
del_pvl_from_vgs(vg_from, pvl);
add_pvl_to_vgs(vg_to, pvl);
pvl->pv->vg_name = dm_pool_strdup(cmd->mem, vg_to->name);
/* Mark the VGs that still hold metadata for the old VG */
log_debug_metadata("Marking PV %s as moved to VG %s", dev_name(pvl->pv->dev), vg_to->name);
pvl->pv->status |= PV_MOVED_VG;
}
/* Fix up LVIDs */
dm_list_iterate_items(lvl1, &vg_to->lvs) {
union lvid *lvid1 = &lvl1->lv->lvid;
char uuid[64] __attribute__((aligned(8)));
dm_list_iterate_items(lvl2, &vg_from->lvs) {
union lvid *lvid2 = &lvl2->lv->lvid;
if (id_equal(&lvid1->id[1], &lvid2->id[1])) {
if (!id_create(&lvid2->id[1])) {
log_error("Failed to generate new "
"random LVID for %s",
lvl2->lv->name);
goto bad;
}
if (!id_write_format(&lvid2->id[1], uuid,
sizeof(uuid)))
goto_bad;
log_verbose("Changed LVID for %s to %s",
lvl2->lv->name, uuid);
}
}
}
dm_list_iterate_items(lvl1, &vg_from->lvs) {
lvl1->lv->vg = vg_to;
lvl1->lv->lvid.id[0] = lvl1->lv->vg->id;
}
while (!dm_list_empty(&vg_from->lvs)) {
struct dm_list *lvh = vg_from->lvs.n;
dm_list_move(&vg_to->lvs, lvh);
}
while (!dm_list_empty(&vg_from->fid->metadata_areas_in_use)) {
struct dm_list *mdah = vg_from->fid->metadata_areas_in_use.n;
dm_list_move(&vg_to->fid->metadata_areas_in_use, mdah);
}
while (!dm_list_empty(&vg_from->fid->metadata_areas_ignored)) {
struct dm_list *mdah = vg_from->fid->metadata_areas_ignored.n;
dm_list_move(&vg_to->fid->metadata_areas_ignored, mdah);
}
if (!vg_to->pool_metadata_spare_lv)
vg_to->pool_metadata_spare_lv =
vg_from->pool_metadata_spare_lv;
vg_to->extent_count += vg_from->extent_count;
vg_to->free_count += vg_from->free_count;
/* Flag up that some PVs have moved from another VG */
vg_to->old_name = vg_from->name;
/* Check whether size of pmspare is big enough now for merged VG */
if (!handle_pool_metadata_spare(vg_to, 0, &vg_to->pvs, poolmetadataspare))
goto_bad;
/* store it on disks */
log_verbose("Writing out updated volume group");
if (!vg_write(vg_to) || !vg_commit(vg_to))
goto_bad;
/* FIXME Remove /dev/vgfrom */
backup(vg_to);
log_print_unless_silent("Volume group \"%s\" successfully merged into \"%s\"",
vg_from->name, vg_to->name);
r = ECMD_PROCESSED;
bad:
/*
* Note: as vg_to is referencing moved elements from vg_from
* the order of release_vg calls is mandatory.
*/
unlock_and_release_vg(cmd, vg_to, vg_name_to);
unlock_and_release_vg(cmd, vg_from, vg_name_from);
return r;
}
int vgmerge(struct cmd_context *cmd, int argc, char **argv)
{
const char *vg_name_to, *vg_name_from;
int opt = 0;
int ret = 0, ret_max = 0;
if (argc < 2) {
log_error("Please enter 2 or more volume groups to merge");
return EINVALID_CMD_LINE;
}
if (!lock_global(cmd, "ex"))
return ECMD_FAILED;
clear_hint_file(cmd);
vg_name_to = skip_dev_dir(cmd, argv[0], NULL);
argc--;
argv++;
for (; opt < argc; opt++) {
vg_name_from = skip_dev_dir(cmd, argv[opt], NULL);
ret = _vgmerge_single(cmd, vg_name_to, vg_name_from);
if (ret > ret_max)
ret_max = ret;
}
return ret_max;
}
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