/*
* 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
*/
/* Ensure all the PVs used by this LV remain in the same */
/* VG as each other */
vg_with = NULL;
dm_list_iterate_items(seg, &lv->segments) {
for (s = 0; s < seg->area_count; s++) {
/* FIXME Check AREA_LV too */
if (seg_type(seg, s) != AREA_PV)
continue;
pv = seg_pv(seg, s);
if (vg_with) {
if (!pv_is_in_vg(vg_with, pv)) {
log_error("Can't split Logical "
"Volume %s between "
"two Volume Groups",
lv->name);
return 0;
}
continue;
}
if (pv_is_in_vg(vg_from, pv)) {
vg_with = vg_from;
continue;
}
if (pv_is_in_vg(vg_to, pv)) {
vg_with = vg_to;
continue;
}
log_error("Physical Volume %s not found",
pv_dev_name(pv));
return 0;
}
}
if (vg_with == vg_from)
continue;
/* Move this LV */
if (!_move_one_lv(vg_from, vg_to, lvh))
return_0;
}
/* FIXME Ensure no LVs contain segs pointing at LVs in the other VG */
return 1;
}
/*
* Move the hidden / internal "snapshotN" LVs.from 'vg_from' to 'vg_to'.
*/
static int _move_snapshots(struct volume_group *vg_from,
struct volume_group *vg_to)
{
struct dm_list *lvh, *lvht;
struct logical_volume *lv;
struct lv_segment *seg;
int cow_from = 0;
int origin_from = 0;
if (cow_from && origin_from)
continue;
if ((!cow_from && origin_from) ||
(cow_from && !origin_from)) {
log_error("Can't split snapshot %s between"
" two Volume Groups", seg->cow->name);
return 0;
}
/*
* At this point, the cow and origin should already be
* in vg_to.
*/
if (_lv_is_in_vg(vg_to, seg->cow) &&
_lv_is_in_vg(vg_to, seg->origin)) {
if (!_move_one_lv(vg_from, vg_to, lvh))
return_0;
}
}
if (seg_in == seg->area_count && log_in) {
if (!_move_one_lv(vg_from, vg_to, lvh))
return_0;
}
}
return 1;
}
/*
* Create or open the destination of the vgsplit operation.
* Returns
* - non-NULL: VG handle w/VG lock held
* - NULL: no VG lock held
*/
static struct volume_group *_vgsplit_to(struct cmd_context *cmd,
const char *vg_name_to,
int *existing_vg)
{
struct volume_group *vg_to = NULL;
log_verbose("Checking for new volume group \"%s\"", vg_name_to);
/*
* First try to create a new VG. If we cannot create it,
* and we get FAILED_EXIST (we will not be holding a lock),
* a VG must already exist with this name. We then try to
* read the existing VG - the vgsplit will be into an existing VG.
*
* Otherwise, if the lock was successful, it must be the case that
* we obtained a WRITE lock and could not find the vgname in the
* system. Thus, the split will be into a new VG.
*/
vg_to = vg_create(cmd, vg_name_to);
if (vg_read_error(vg_to) == FAILED_LOCKING) {
log_error("Can't get lock for %s", vg_name_to);
vg_release(vg_to);
return NULL;
}
if (vg_read_error(vg_to) == FAILED_EXIST) {
*existing_vg = 1;
vg_release(vg_to);
vg_to = vg_read_for_update(cmd, vg_name_to, NULL, 0);
if (vg_read_error(vg_to)) {
vg_release(vg_to);
stack;
return NULL;
}
/*
* Has the user given an option related to a new vg as the split destination?
*/
static int new_vg_option_specified(struct cmd_context *cmd)
{
return(arg_count(cmd, clustered_ARG) ||
arg_count(cmd, alloc_ARG) ||
arg_count(cmd, maxphysicalvolumes_ARG) ||
arg_count(cmd, maxlogicalvolumes_ARG));
}
int vgsplit(struct cmd_context *cmd, int argc, char **argv)
{
struct vgcreate_params vp_new;
struct vgcreate_params vp_def;
char *vg_name_from, *vg_name_to;
struct volume_group *vg_to = NULL, *vg_from = NULL;
int opt;
int existing_vg = 0;
int r = ECMD_FAILED;
const char *lv_name;
int lock_vg_from_first = 1;
if ((arg_count(cmd, name_ARG) + argc) < 3) {
log_error("Existing VG, new VG and either physical volumes "
"or logical volume required.");
return EINVALID_CMD_LINE;
}
if (arg_count(cmd, name_ARG) && (argc > 2)) {
log_error("A logical volume name cannot be given with "
"physical volumes.");
return ECMD_FAILED;
}
if (!strcmp(vg_name_to, vg_name_from)) {
log_error("Duplicate volume group name \"%s\"", vg_name_from);
return ECMD_FAILED;
}
if (strcmp(vg_name_to, vg_name_from) < 0)
lock_vg_from_first = 0;
if (lock_vg_from_first) {
vg_from = _vgsplit_from(cmd, vg_name_from);
if (!vg_from) {
stack;
return ECMD_FAILED;
}
/*
* Set metadata format of original VG.
* NOTE: We must set the format before calling vg_create()
* since vg_create() calls the per-format constructor.
*/
cmd->fmt = vg_from->fid->fmt;
if (cmd->fmt != vg_from->fid->fmt) {
/* In this case we don't know the vg_from->fid->fmt */
log_error("Unable to set new VG metadata type based on "
"source VG format - use -M option.");
goto bad;
}
}
if (existing_vg) {
if (new_vg_option_specified(cmd)) {
log_error("Volume group \"%s\" exists, but new VG "
"option specified", vg_name_to);
goto bad;
}
if (!vgs_are_compatible(cmd, vg_from,vg_to))
goto_bad;
} else {
vgcreate_params_set_defaults(&vp_def, vg_from);
vp_def.vg_name = vg_name_to;
if (vgcreate_params_set_from_args(cmd, &vp_new, &vp_def)) {
r = EINVALID_CMD_LINE;
goto_bad;
}
if (vgcreate_params_validate(cmd, &vp_new)) {
r = EINVALID_CMD_LINE;
goto_bad;
}
/* FIXME Separate the 'move' from the 'validation' to fix dev stacks */
/* Move required mirrors across */
if (!(_move_mirrors(vg_from, vg_to)))
goto_bad;
/* Move required snapshots across */
if (!(_move_snapshots(vg_from, vg_to)))
goto_bad;
/* Split metadata areas and check if both vgs have at least one area */
if (!(vg_split_mdas(cmd, vg_from, vg_to)) && vg_from->pv_count) {
log_error("Cannot split: Nowhere to store metadata for new Volume Group");
goto bad;
}
/* Set proper name for all PVs in new VG */
if (!vg_rename(cmd, vg_to, vg_name_to))
goto_bad;
/* store it on disks */
log_verbose("Writing out updated volume groups");
/*
* First, write out the new VG as EXPORTED. We do this first in case
* there is a crash - we will still have the new VG information, in an
* exported state. Recovery after this point would be removal of the
* new VG and redoing the vgsplit.
* FIXME: recover automatically or instruct the user?
*/
vg_to->status |= EXPORTED_VG;
if (!archive(vg_to))
goto_bad;
if (!vg_write(vg_to) || !vg_commit(vg_to))
goto_bad;
backup(vg_to);
/*
* Next, write out the updated old VG. If we crash after this point,
* recovery is a vgimport on the new VG.
* FIXME: recover automatically or instruct the user?
*/
if (vg_from->pv_count) {
if (!vg_write(vg_from) || !vg_commit(vg_from))
goto_bad;
backup(vg_from);
}
/*
* Finally, remove the EXPORTED flag from the new VG and write it out.
*/
if (!test_mode()) {
vg_release(vg_to);
vg_to = vg_read_for_update(cmd, vg_name_to, NULL,
READ_ALLOW_EXPORTED);
if (vg_read_error(vg_to)) {
log_error("Volume group \"%s\" became inconsistent: "
"please fix manually", vg_name_to);
goto bad;
}
}
vg_to->status &= ~EXPORTED_VG;
if (!vg_write(vg_to) || !vg_commit(vg_to))
goto_bad;
backup(vg_to);
log_print("%s volume group \"%s\" successfully split from \"%s\"",
existing_vg ? "Existing" : "New",
vg_to->name, vg_from->name);
