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lvm2/tools/vgsplit.c

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/*
* Copyright (C) 2001 Sistina Software
*
* LVM is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LVM is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with LVM; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include "tools.h"
static int _move_pv(struct volume_group *vg_from, struct volume_group *vg_to,
char *pv_name)
{
struct pv_list *pvl;
struct physical_volume *pv;
if (!(pvl = find_pv_in_vg(vg_from, pv_name))) {
log_error("Physical volume %s not in volume group %s",
pv_name, vg_from->name);
return 0;
}
list_del(&pvl->list);
list_add(&vg_to->pvs, &pvl->list);
vg_from->pv_count--;
vg_to->pv_count++;
pv = list_item(pvl, struct pv_list)->pv;
vg_from->extent_count -= pv->pe_count;
vg_to->extent_count += pv->pe_count;
vg_from->free_count -= pv->pe_count - pv->pe_alloc_count;
vg_to->free_count += pv->pe_count - pv->pe_alloc_count;
return 1;
}
static int _move_lvs(struct volume_group *vg_from, struct volume_group *vg_to)
{
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struct list *lvh, *lvht;
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struct logical_volume *lv;
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struct lv_segment *seg;
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struct physical_volume *pv;
struct volume_group *vg_with;
unsigned int s;
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list_iterate_safe(lvh, lvht, &vg_from->lvs) {
lv = list_item(lvh, struct lv_list)->lv;
/* Ensure all the PVs used by this LV remain in the same */
/* VG as each other */
vg_with = NULL;
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list_iterate_items(seg, &lv->segments) {
for (s = 0; s < seg->area_count; s++) {
/* FIXME Check AREA_LV too */
if (seg->area[s].type != AREA_PV)
continue;
pv = seg->area[s].u.pv.pv;
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if (vg_with) {
if (!pv_is_in_vg(vg_with, pv)) {
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log_error("Logical Volume %s "
"split between "
"Volume Groups",
lv->name);
return 0;
}
continue;
}
if (pv_is_in_vg(vg_from, pv)) {
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vg_with = vg_from;
continue;
}
if (pv_is_in_vg(vg_to, pv)) {
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vg_with = vg_to;
continue;
}
log_error("Physical Volume %s not found",
dev_name(pv->dev));
return 0;
}
}
if (vg_with == vg_from)
continue;
/* Move this LV */
list_del(lvh);
list_add(&vg_to->lvs, lvh);
vg_from->lv_count--;
vg_to->lv_count++;
}
/* FIXME Ensure no LVs contain segs pointing at LVs in the other VG */
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return 1;
}
static int _lv_is_in_vg(struct volume_group *vg, struct logical_volume *lv)
{
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struct lv_list *lvl;
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list_iterate_items(lvl, &vg->lvs)
if (lv == lvl->lv)
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return 1;
return 0;
}
static int _move_snapshots(struct volume_group *vg_from,
struct volume_group *vg_to)
{
struct list *slh, *slth;
struct snapshot *snap;
int cow_from, origin_from;
list_iterate_safe(slh, slth, &vg_from->snapshots) {
snap = list_item(slh, struct snapshot_list)->snapshot;
cow_from = _lv_is_in_vg(vg_from, snap->cow);
origin_from = _lv_is_in_vg(vg_from, snap->origin);
if (cow_from && origin_from)
return 1;
if ((!cow_from && origin_from) || (cow_from && !origin_from)) {
log_error("Snapshot %s split", snap->cow->name);
return 0;
}
vg_from->snapshot_count--;
vg_to->snapshot_count++;
list_del(slh);
list_add(&vg_to->snapshots, slh);
}
return 1;
}
int vgsplit(struct cmd_context *cmd, int argc, char **argv)
{
char *vg_name_from, *vg_name_to;
struct volume_group *vg_to, *vg_from;
int opt;
int active;
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int consistent = 1;
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if (argc < 3) {
log_error("Existing VG, new VG and physical volumes required.");
return EINVALID_CMD_LINE;
}
vg_name_from = argv[0];
vg_name_to = argv[1];
argc -= 2;
argv += 2;
if (!strcmp(vg_name_to, vg_name_from)) {
log_error("Duplicate volume group name \"%s\"", vg_name_from);
return ECMD_FAILED;
}
log_verbose("Checking for volume group \"%s\"", vg_name_from);
if (!lock_vol(cmd, vg_name_from, LCK_VG_WRITE)) {
log_error("Can't get lock for %s", vg_name_from);
return ECMD_FAILED;
}
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if (!(vg_from = vg_read(cmd, vg_name_from, &consistent)) || !consistent) {
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log_error("Volume group \"%s\" doesn't exist", vg_name_from);
unlock_vg(cmd, vg_name_from);
return ECMD_FAILED;
}
if (vg_from->status & EXPORTED_VG) {
log_error("Volume group \"%s\" is exported", vg_from->name);
unlock_vg(cmd, vg_name_from);
return ECMD_FAILED;
}
if (!(vg_from->status & LVM_WRITE)) {
log_error("Volume group \"%s\" is read-only", vg_from->name);
unlock_vg(cmd, vg_name_from);
return ECMD_FAILED;
}
log_verbose("Checking for volume group \"%s\"", vg_name_to);
if (!lock_vol(cmd, vg_name_to, LCK_VG_WRITE | LCK_NONBLOCK)) {
log_error("Can't get lock for %s", vg_name_to);
unlock_vg(cmd, vg_name_from);
return ECMD_FAILED;
}
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consistent = 0;
if ((vg_to = vg_read(cmd, vg_name_to, &consistent))) {
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/* FIXME Remove this restriction */
log_error("Volume group \"%s\" already exists", vg_name_to);
goto error;
}
if ((active = lvs_in_vg_activated(vg_from))) {
/* FIXME Remove this restriction */
log_error("Logical volumes in \"%s\" must be inactive",
vg_name_from);
goto error;
}
/* Create new VG structure */
if (!(vg_to = vg_create(cmd, vg_name_to, vg_from->extent_size,
vg_from->max_pv, vg_from->max_lv, 0, NULL)))
goto error;
/* Archive vg_from before changing it */
if (!archive(vg_from))
goto error;
/* Move PVs across to new structure */
for (opt = 0; opt < argc; opt++) {
if (!_move_pv(vg_from, vg_to, argv[opt]))
goto error;
}
/* Move required LVs across, checking consistency */
if (!(_move_lvs(vg_from, vg_to)))
goto error;
/* Move required snapshots across */
if (!(_move_snapshots(vg_from, vg_to)))
goto error;
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/* FIXME Split mdas properly somehow too! */
/* Currently we cheat by sharing the format instance and relying on
* vg_write to ignore mdas outside the VG! Done this way, with text
* format, vg_from disappears for a short time. */
vg_to->fid = vg_from->fid;
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/* store it on disks */
log_verbose("Writing out updated volume groups");
/* Write out new VG as EXPORTED */
vg_to->status |= EXPORTED_VG;
if (!archive(vg_to))
goto error;
if (!vg_write(vg_to) || !vg_commit(vg_to))
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goto error;
backup(vg_to);
/* Write out updated old VG */
if (!vg_write(vg_from) || !vg_commit(vg_from))
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goto error;
backup(vg_from);
/* Remove EXPORTED flag from new VG */
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consistent = 1;
if (!(vg_to = vg_read(cmd, vg_name_to, &consistent)) || !consistent) {
log_error("Volume group \"%s\" became inconsistent: please "
"fix manually", vg_name_to);
goto error;
}
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vg_to->status &= ~EXPORTED_VG;
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if (!vg_write(vg_to) || !vg_commit(vg_to))
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goto error;
backup(vg_to);
unlock_vg(cmd, vg_name_from);
unlock_vg(cmd, vg_name_to);
log_print("Volume group \"%s\" successfully split from \"%s\"",
vg_to->name, vg_from->name);
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return ECMD_PROCESSED;
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error:
unlock_vg(cmd, vg_name_from);
unlock_vg(cmd, vg_name_to);
return ECMD_FAILED;
}