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lvm2/tools/vgreduce.c

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2005 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 General Public License v.2.
*
* You should have received a copy of the GNU 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"
#include "lv_alloc.h"
static int _remove_pv(struct volume_group *vg, struct pv_list *pvl)
{
char uuid[64];
if (vg->pv_count == 1) {
log_error("Volume Groups must always contain at least one PV");
return 0;
}
if (!id_write_format(&pvl->pv->id, uuid, sizeof(uuid))) {
stack;
return 0;
}
log_verbose("Removing PV with UUID %s from VG %s", uuid, vg->name);
if (pvl->pv->pe_alloc_count) {
log_error("LVs still present on PV with UUID %s: Can't remove "
"from VG %s", uuid, vg->name);
return 0;
}
vg->free_count -= pvl->pv->pe_count;
vg->extent_count -= pvl->pv->pe_count;
vg->pv_count--;
list_del(&pvl->list);
return 1;
}
static int _remove_lv(struct cmd_context *cmd, struct logical_volume *lv,
int *list_unsafe, struct list *lvs_changed)
{
struct lv_segment *snap_seg, *mirror_seg;
struct list *snh, *snht;
struct logical_volume *cow;
struct lv_list *lvl;
uint32_t extents;
struct lvinfo info;
int first = 1;
log_verbose("%s/%s has missing extents: removing (including "
"dependencies)", lv->vg->name, lv->name);
/* FIXME Cope properly with stacked devices & snapshots. */
/* If snapshot device is missing, deactivate origin. */
if (lv_is_cow(lv) && (snap_seg = find_cow(lv))) {
log_verbose("Deactivating (if active) logical volume %s "
"(origin of %s)", snap_seg->origin->name, lv->name);
if (!test_mode() && !deactivate_lv(cmd, snap_seg->origin)) {
log_error("Failed to deactivate LV %s",
snap_seg->origin->name);
return 0;
}
/* Use the origin LV */
lv = snap_seg->origin;
}
/* Remove snapshot dependencies */
list_iterate_safe(snh, snht, &lv->snapshot_segs) {
snap_seg = list_struct_base(snh, struct lv_segment,
origin_list);
cow = snap_seg->cow;
if (first && !test_mode() &&
!deactivate_lv(cmd, snap_seg->origin)) {
log_error("Failed to deactivate LV %s",
snap_seg->origin->name);
return 0;
}
*list_unsafe = 1; /* May remove caller's lvht! */
if (!vg_remove_snapshot(cow)) {
stack;
return 0;
}
log_verbose("Removing LV %s from VG %s", cow->name,
lv->vg->name);
if (!lv_remove(cow)) {
stack;
return 0;
}
first = 0;
}
/*
* If LV is active, replace it with error segment
* and add to list of LVs to be removed later.
* Doesn't apply to snapshots/origins yet - they're already deactivated.
*/
if (lv_info(cmd, lv, &info, 0) && info.exists) {
extents = lv->le_count;
mirror_seg = first_seg(lv)->mirror_seg;
if (!lv_empty(lv)) {
stack;
return 0;
}
if (!lv_add_virtual_segment(lv, 0, extents,
get_segtype_from_string(cmd,
"error"))) {
stack;
return 0;
}
if (mirror_seg) {
first_seg(lv)->status |= MIRROR_IMAGE;
first_seg(lv)->mirror_seg = mirror_seg;
}
if (!(lvl = dm_pool_alloc(cmd->mem, sizeof(*lvl)))) {
log_error("lv_list alloc failed");
return 0;
}
lvl->lv = lv;
list_add(lvs_changed, &lvl->list);
} else {
/* Remove LV immediately. */
log_verbose("Removing LV %s from VG %s", lv->name, lv->vg->name);
if (!lv_remove(lv)) {
stack;
return 0;
}
}
return 1;
}
static int _make_vg_consistent(struct cmd_context *cmd, struct volume_group *vg)
{
struct list *pvh, *pvht;
struct list *lvh, *lvht;
struct pv_list *pvl;
struct lv_list *lvl, *lvl2, *lvlt;
struct logical_volume *lv;
struct physical_volume *pv;
struct lv_segment *seg, *mirrored_seg;
struct lv_segment_area area;
unsigned int s;
uint32_t mimages;
int list_unsafe, only_mirror_images_found;
LIST_INIT(lvs_changed);
only_mirror_images_found = 1;
/* Deactivate & remove necessary LVs */
restart_loop:
list_unsafe = 0; /* Set if we delete a different list-member */
list_iterate_safe(lvh, lvht, &vg->lvs) {
lv = list_item(lvh, struct lv_list)->lv;
/* Are any segments of this LV on missing PVs? */
list_iterate_items(seg, &lv->segments) {
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) != AREA_PV)
continue;
/* FIXME Also check for segs on deleted LVs */
pv = seg_pv(seg, s);
if (!pv || !pv->dev) {
if (arg_count(cmd, mirrorsonly_ARG) &&
!(lv->status & MIRROR_IMAGE)) {
log_error("Non-mirror-image LV %s found: can't remove.", lv->name);
only_mirror_images_found = 0;
continue;
}
if (!_remove_lv(cmd, lv, &list_unsafe, &lvs_changed)) {
stack;
return 0;
}
if (list_unsafe)
goto restart_loop;
}
}
}
}
if (!only_mirror_images_found) {
log_error("Aborting because --mirrorsonly was specified.");
return 0;
}
/* Remove missing PVs */
list_iterate_safe(pvh, pvht, &vg->pvs) {
pvl = list_item(pvh, struct pv_list);
if (pvl->pv->dev)
continue;
if (!_remove_pv(vg, pvl)) {
stack;
return 0;
}
}
/* VG is now consistent */
vg->status &= ~PARTIAL_VG;
vg->status |= LVM_WRITE;
init_partial(0);
/* FIXME Recovery. For now people must clean up by hand. */
if (!list_empty(&lvs_changed)) {
if (!vg_write(vg)) {
log_error("Failed to write out a consistent VG for %s",
vg->name);
return 0;
}
if (!test_mode()) {
/* Suspend lvs_changed */
init_partial(1);
if (!suspend_lvs(cmd, &lvs_changed)) {
stack;
init_partial(0);
vg_revert(vg);
return 0;
}
init_partial(0);
}
if (!vg_commit(vg)) {
log_error("Failed to commit consistent VG for %s",
vg->name);
vg_revert(vg);
return 0;
}
if (!test_mode()) {
if (!resume_lvs(cmd, &lvs_changed)) {
log_error("Failed to resume LVs using error segments.");
return 0;
}
}
/* Remove lost mirror images from mirrors */
list_iterate_items(lvl, &vg->lvs) {
mirrored_seg = first_seg(lvl->lv);
if (!seg_is_mirrored(mirrored_seg))
continue;
mimages = mirrored_seg->area_count;
for (s = 0; s < mirrored_seg->area_count; s++) {
list_iterate_items_safe(lvl2, lvlt, &lvs_changed) {
if (seg_type(mirrored_seg, s) != AREA_LV ||
lvl2->lv != seg_lv(mirrored_seg, s))
continue;
list_del(&lvl2->list);
area = mirrored_seg->areas[mimages - 1];
mirrored_seg->areas[mimages - 1] = mirrored_seg->areas[s];
mirrored_seg->areas[s] = area;
mimages--; /* FIXME Assumes uniqueness */
}
}
if (mimages != mirrored_seg->area_count) {
if (!remove_mirror_images(mirrored_seg, mimages, NULL, 0)) {
stack;
return 0;
}
if (!vg_write(vg)) {
log_error("Failed to write out updated "
"VG for %s", vg->name);
return 0;
}
if (!vg_commit(vg)) {
log_error("Failed to commit updated VG "
"for %s", vg->name);
vg_revert(vg);
return 0;
}
}
}
/* Deactivate error LVs */
if (!test_mode()) {
list_iterate_items(lvl, &lvs_changed) {
log_verbose("Deactivating (if active) logical volume %s",
lvl->lv->name);
if (!deactivate_lv(cmd, lvl->lv)) {
log_error("Failed to deactivate LV %s",
lvl->lv->name);
return 0;
}
}
}
/* Remove remaining LVs */
list_iterate_items(lvl, &lvs_changed) {
log_verbose("Removing LV %s from VG %s", lvl->lv->name,
lvl->lv->vg->name);
if (!lv_remove(lvl->lv)) {
stack;
return 0;
}
}
}
return 1;
}
/* Or take pv_name instead? */
static int _vgreduce_single(struct cmd_context *cmd, struct volume_group *vg,
struct physical_volume *pv, void *handle)
{
struct pv_list *pvl;
const char *name = dev_name(pv->dev);
if (pv->pe_alloc_count) {
log_error("Physical volume \"%s\" still in use", name);
return ECMD_FAILED;
}
if (vg->pv_count == 1) {
log_error("Can't remove final physical volume \"%s\" from "
"volume group \"%s\"", name, vg->name);
return ECMD_FAILED;
}
pvl = find_pv_in_vg(vg, name);
if (!archive(vg))
return ECMD_FAILED;
log_verbose("Removing \"%s\" from volume group \"%s\"", name, vg->name);
if (pvl)
list_del(&pvl->list);
pv->vg_name = ORPHAN;
pv->status = ALLOCATABLE_PV;
if (!dev_get_size(pv->dev, &pv->size)) {
log_error("%s: Couldn't get size.", dev_name(pv->dev));
return ECMD_FAILED;
}
vg->pv_count--;
vg->free_count -= pv->pe_count - pv->pe_alloc_count;
vg->extent_count -= pv->pe_count;
if (!vg_write(vg) || !vg_commit(vg)) {
log_error("Removal of physical volume \"%s\" from "
"\"%s\" failed", name, vg->name);
return ECMD_FAILED;
}
if (!pv_write(cmd, pv, NULL, INT64_C(-1))) {
log_error("Failed to clear metadata from physical "
"volume \"%s\" "
"after removal from \"%s\"", name, vg->name);
return ECMD_FAILED;
}
backup(vg);
log_print("Removed \"%s\" from volume group \"%s\"", name, vg->name);
return ECMD_PROCESSED;
}
int vgreduce(struct cmd_context *cmd, int argc, char **argv)
{
struct volume_group *vg;
char *vg_name;
int ret = 1;
int consistent = 1;
if (!argc & !arg_count(cmd, removemissing_ARG)) {
log_error("Please give volume group name and "
"physical volume paths");
return EINVALID_CMD_LINE;
}
if (!argc & arg_count(cmd, removemissing_ARG)) {
log_error("Please give volume group name");
return EINVALID_CMD_LINE;
}
if (arg_count(cmd, mirrorsonly_ARG) &&
!arg_count(cmd, removemissing_ARG)) {
log_error("--mirrorsonly requires --removemissing");
return EINVALID_CMD_LINE;
}
if (argc == 1 && !arg_count(cmd, all_ARG)
&& !arg_count(cmd, removemissing_ARG)) {
log_error("Please enter physical volume paths or option -a");
return EINVALID_CMD_LINE;
}
if (argc > 1 && arg_count(cmd, all_ARG)) {
log_error("Option -a and physical volume paths mutually "
"exclusive");
return EINVALID_CMD_LINE;
}
if (argc > 1 && arg_count(cmd, removemissing_ARG)) {
log_error("Please only specify the volume group");
return EINVALID_CMD_LINE;
}
vg_name = argv[0];
argv++;
argc--;
log_verbose("Finding volume group \"%s\"", vg_name);
if (!lock_vol(cmd, vg_name, LCK_VG_WRITE)) {
log_error("Can't get lock for %s", vg_name);
return ECMD_FAILED;
}
if ((!(vg = vg_read(cmd, vg_name, &consistent)) || !consistent) &&
!arg_count(cmd, removemissing_ARG)) {
log_error("Volume group \"%s\" doesn't exist", vg_name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
if (arg_count(cmd, removemissing_ARG)) {
if (vg && consistent) {
log_error("Volume group \"%s\" is already consistent",
vg_name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
init_partial(1);
consistent = 0;
if (!(vg = vg_read(cmd, vg_name, &consistent))) {
log_error("Volume group \"%s\" not found", vg_name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
if (!archive(vg)) {
init_partial(0);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
if (!_make_vg_consistent(cmd, vg)) {
init_partial(0);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
if (!vg_write(vg) || !vg_commit(vg)) {
log_error("Failed to write out a consistent VG for %s",
vg_name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
backup(vg);
log_print("Wrote out consistent volume group %s", vg_name);
} else {
if (vg->status & EXPORTED_VG) {
log_error("Volume group \"%s\" is exported", vg->name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
if (!(vg->status & LVM_WRITE)) {
log_error("Volume group \"%s\" is read-only", vg_name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
if (!(vg->status & RESIZEABLE_VG)) {
log_error("Volume group \"%s\" is not reducible",
vg_name);
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
}
/* FIXME: Pass private struct through to all these functions */
/* and update in batch here? */
ret = process_each_pv(cmd, argc, argv, vg, NULL,
_vgreduce_single);
}
unlock_vg(cmd, vg_name);
return ret;
/******* FIXME
log_error ("no empty physical volumes found in volume group \"%s\"", vg_name);
log_verbose
("volume group \"%s\" will be reduced by %d physical volume%s",
vg_name, np, np > 1 ? "s" : "");
log_verbose ("reducing volume group \"%s\" by physical volume \"%s\"",
vg_name, pv_names[p]);
log_print
("volume group \"%s\" %ssuccessfully reduced by physical volume%s:",
vg_name, error > 0 ? "NOT " : "", p > 1 ? "s" : "");
log_print("%s", pv_this[p]->pv_name);
********/
}
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