mirror of
git://sourceware.org/git/lvm2.git
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293 lines
7.0 KiB
C
293 lines
7.0 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "tools.h"
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static int _move_pv(struct volume_group *vg_from, struct volume_group *vg_to,
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char *pv_name)
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{
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struct pv_list *pvl;
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struct physical_volume *pv;
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if (!(pvl = find_pv_in_vg(vg_from, pv_name))) {
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log_error("Physical volume %s not in volume group %s",
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pv_name, vg_from->name);
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return 0;
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}
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list_del(&pvl->list);
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list_add(&vg_to->pvs, &pvl->list);
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vg_from->pv_count--;
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vg_to->pv_count++;
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pv = list_item(pvl, struct pv_list)->pv;
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vg_from->extent_count -= pv->pe_count;
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vg_to->extent_count += pv->pe_count;
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vg_from->free_count -= pv->pe_count - pv->pe_alloc_count;
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vg_to->free_count += pv->pe_count - pv->pe_alloc_count;
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return 1;
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}
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static int _move_lvs(struct volume_group *vg_from, struct volume_group *vg_to)
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{
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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;
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struct volume_group *vg_with;
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unsigned int s;
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list_iterate_safe(lvh, lvht, &vg_from->lvs) {
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lv = list_item(lvh, struct lv_list)->lv;
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/* Ensure all the PVs used by this LV remain in the same */
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/* VG as each other */
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vg_with = NULL;
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list_iterate_items(seg, &lv->segments) {
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for (s = 0; s < seg->area_count; s++) {
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/* FIXME Check AREA_LV too */
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if (seg->area[s].type != AREA_PV)
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continue;
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pv = seg->area[s].u.pv.pv;
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if (vg_with) {
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if (!pv_is_in_vg(vg_with, pv)) {
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log_error("Logical Volume %s "
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"split between "
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"Volume Groups",
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lv->name);
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return 0;
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}
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continue;
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}
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if (pv_is_in_vg(vg_from, pv)) {
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vg_with = vg_from;
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continue;
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}
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if (pv_is_in_vg(vg_to, pv)) {
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vg_with = vg_to;
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continue;
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}
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log_error("Physical Volume %s not found",
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dev_name(pv->dev));
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return 0;
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}
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}
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if (vg_with == vg_from)
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continue;
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/* Move this LV */
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list_del(lvh);
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list_add(&vg_to->lvs, lvh);
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vg_from->lv_count--;
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vg_to->lv_count++;
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}
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/* FIXME Ensure no LVs contain segs pointing at LVs in the other VG */
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return 1;
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}
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static int _lv_is_in_vg(struct volume_group *vg, struct logical_volume *lv)
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{
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struct lv_list *lvl;
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list_iterate_items(lvl, &vg->lvs)
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if (lv == lvl->lv)
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return 1;
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return 0;
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}
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static int _move_snapshots(struct volume_group *vg_from,
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struct volume_group *vg_to)
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{
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struct list *slh, *slth;
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struct snapshot *snap;
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int cow_from, origin_from;
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list_iterate_safe(slh, slth, &vg_from->snapshots) {
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snap = list_item(slh, struct snapshot_list)->snapshot;
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cow_from = _lv_is_in_vg(vg_from, snap->cow);
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origin_from = _lv_is_in_vg(vg_from, snap->origin);
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if (cow_from && origin_from)
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return 1;
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if ((!cow_from && origin_from) || (cow_from && !origin_from)) {
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log_error("Snapshot %s split", snap->cow->name);
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return 0;
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}
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vg_from->snapshot_count--;
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vg_to->snapshot_count++;
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list_del(slh);
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list_add(&vg_to->snapshots, slh);
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}
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return 1;
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}
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int vgsplit(struct cmd_context *cmd, int argc, char **argv)
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{
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char *vg_name_from, *vg_name_to;
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struct volume_group *vg_to, *vg_from;
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int opt;
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int active;
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int consistent = 1;
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if (argc < 3) {
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log_error("Existing VG, new VG and physical volumes required.");
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return EINVALID_CMD_LINE;
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}
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vg_name_from = argv[0];
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vg_name_to = argv[1];
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argc -= 2;
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argv += 2;
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if (!strcmp(vg_name_to, vg_name_from)) {
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log_error("Duplicate volume group name \"%s\"", vg_name_from);
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return ECMD_FAILED;
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}
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log_verbose("Checking for volume group \"%s\"", vg_name_from);
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if (!lock_vol(cmd, vg_name_from, LCK_VG_WRITE)) {
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log_error("Can't get lock for %s", vg_name_from);
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return ECMD_FAILED;
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}
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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);
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unlock_vg(cmd, vg_name_from);
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return ECMD_FAILED;
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}
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if (vg_from->status & EXPORTED_VG) {
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log_error("Volume group \"%s\" is exported", vg_from->name);
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unlock_vg(cmd, vg_name_from);
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return ECMD_FAILED;
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}
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if (!(vg_from->status & LVM_WRITE)) {
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log_error("Volume group \"%s\" is read-only", vg_from->name);
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unlock_vg(cmd, vg_name_from);
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return ECMD_FAILED;
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}
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log_verbose("Checking for volume group \"%s\"", vg_name_to);
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if (!lock_vol(cmd, vg_name_to, LCK_VG_WRITE | LCK_NONBLOCK)) {
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log_error("Can't get lock for %s", vg_name_to);
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unlock_vg(cmd, vg_name_from);
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return ECMD_FAILED;
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}
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consistent = 0;
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if ((vg_to = vg_read(cmd, vg_name_to, &consistent))) {
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/* FIXME Remove this restriction */
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log_error("Volume group \"%s\" already exists", vg_name_to);
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goto error;
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}
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if ((active = lvs_in_vg_activated(vg_from))) {
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/* FIXME Remove this restriction */
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log_error("Logical volumes in \"%s\" must be inactive",
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vg_name_from);
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goto error;
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}
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/* Create new VG structure */
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if (!(vg_to = vg_create(cmd, vg_name_to, vg_from->extent_size,
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vg_from->max_pv, vg_from->max_lv,
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vg_from->alloc, 0, NULL)))
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goto error;
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/* Archive vg_from before changing it */
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if (!archive(vg_from))
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goto error;
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/* Move PVs across to new structure */
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for (opt = 0; opt < argc; opt++) {
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if (!_move_pv(vg_from, vg_to, argv[opt]))
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goto error;
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}
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/* Move required LVs across, checking consistency */
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if (!(_move_lvs(vg_from, vg_to)))
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goto error;
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/* Move required snapshots across */
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if (!(_move_snapshots(vg_from, vg_to)))
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goto error;
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/* FIXME Split mdas properly somehow too! */
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/* Currently we cheat by sharing the format instance and relying on
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* vg_write to ignore mdas outside the VG! Done this way, with text
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* format, vg_from disappears for a short time. */
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vg_to->fid = vg_from->fid;
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/* store it on disks */
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log_verbose("Writing out updated volume groups");
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/* Write out new VG as EXPORTED */
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vg_to->status |= EXPORTED_VG;
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if (!archive(vg_to))
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goto error;
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if (!vg_write(vg_to) || !vg_commit(vg_to))
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goto error;
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backup(vg_to);
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/* Write out updated old VG */
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if (!vg_write(vg_from) || !vg_commit(vg_from))
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goto error;
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backup(vg_from);
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/* Remove EXPORTED flag from new VG */
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consistent = 1;
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if (!(vg_to = vg_read(cmd, vg_name_to, &consistent)) || !consistent) {
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log_error("Volume group \"%s\" became inconsistent: please "
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"fix manually", vg_name_to);
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goto error;
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}
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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;
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backup(vg_to);
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unlock_vg(cmd, vg_name_from);
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unlock_vg(cmd, vg_name_to);
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log_print("Volume group \"%s\" successfully split from \"%s\"",
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vg_to->name, vg_from->name);
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return ECMD_PROCESSED;
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error:
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unlock_vg(cmd, vg_name_from);
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unlock_vg(cmd, vg_name_to);
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return ECMD_FAILED;
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}
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