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c64f9e63eb
lvm2/tools/lvconvert.c
Jonathan Earl Brassow c64f9e63eb Don't attempt to convert the log type of an LV if the LV 
is not a mirror.
2010-04-28 17:41:30 +00:00

1664 lines
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/*
* Copyright (C) 2005-2007 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
*/
#include "tools.h"
#include "polldaemon.h"
#include "lv_alloc.h"
struct lvconvert_params {
int snapshot;
int merge;
int zero;
const char *origin;
const char *lv_name;
const char *lv_split_name;
const char *lv_name_full;
const char *vg_name;
int wait_completion;
int need_polling;
uint32_t chunk_size;
uint32_t region_size;
uint32_t mirrors;
sign_t mirrors_sign;
uint32_t keep_mimages;
uint32_t stripes;
uint32_t stripe_size;
struct segment_type *segtype;
alloc_policy_t alloc;
int pv_count;
char **pvs;
struct dm_list *pvh;
struct dm_list *failed_pvs;
struct logical_volume *lv_to_poll;
};
static int _lvconvert_name_params(struct lvconvert_params *lp,
struct cmd_context *cmd,
int *pargc, char ***pargv)
{
char *ptr;
const char *vg_name = NULL;
if (lp->merge)
return 1;
if (lp->snapshot) {
if (!*pargc) {
log_error("Please specify a logical volume to act as "
"the snapshot origin.");
return 0;
}
lp->origin = *pargv[0];
(*pargv)++, (*pargc)--;
if (!(lp->vg_name = extract_vgname(cmd, lp->origin))) {
log_error("The origin name should include the "
"volume group.");
return 0;
}
/* Strip the volume group from the origin */
if ((ptr = strrchr(lp->origin, (int) '/')))
lp->origin = ptr + 1;
}
if (!*pargc) {
log_error("Please provide logical volume path");
return 0;
}
lp->lv_name = lp->lv_name_full = (*pargv)[0];
(*pargv)++, (*pargc)--;
if (strchr(lp->lv_name_full, '/') &&
(vg_name = extract_vgname(cmd, lp->lv_name_full)) &&
lp->vg_name && strcmp(vg_name, lp->vg_name)) {
log_error("Please use a single volume group name "
"(\"%s\" or \"%s\")", vg_name, lp->vg_name);
return 0;
}
if (!lp->vg_name)
lp->vg_name = vg_name;
if (!validate_name(lp->vg_name)) {
log_error("Please provide a valid volume group name");
return 0;
}
if ((ptr = strrchr(lp->lv_name_full, '/')))
lp->lv_name = ptr + 1;
if (!apply_lvname_restrictions(lp->lv_name))
return_0;
if (*pargc && lp->snapshot) {
log_error("Too many arguments provided for snapshots");
return 0;
}
return 1;
}
static int _read_params(struct lvconvert_params *lp, struct cmd_context *cmd,
int argc, char **argv)
{
int region_size;
int pagesize = lvm_getpagesize();
memset(lp, 0, sizeof(*lp));
if ((arg_count(cmd, snapshot_ARG) || arg_count(cmd, merge_ARG)) &&
(arg_count(cmd, mirrorlog_ARG) || arg_count(cmd, mirrors_ARG) ||
arg_count(cmd, repair_ARG))) {
log_error("--snapshot or --merge argument cannot be mixed "
"with --mirrors, --repair or --log");
return 0;
}
if (!arg_count(cmd, background_ARG))
lp->wait_completion = 1;
if (arg_count(cmd, snapshot_ARG))
lp->snapshot = 1;
if (arg_count(cmd, snapshot_ARG) && arg_count(cmd, merge_ARG)) {
log_error("--snapshot and --merge are mutually exclusive");
return 0;
}
if (arg_count(cmd, splitmirrors_ARG) && arg_count(cmd, mirrors_ARG)) {
log_error("--mirrors and --splitmirrors are "
"mutually exclusive");
return 0;
}
/*
* The '--splitmirrors n' argument is equivalent to '--mirrors -n'
* (note the minus sign), except that it signifies the additional
* intent to keep the mimage that is detached, rather than
* discarding it.
*/
if (arg_count(cmd, splitmirrors_ARG)) {
if (!arg_count(cmd, name_ARG)) {
log_error("Please name the new logical volume using '--name'");
return 0;
}
lp->lv_split_name = arg_value(cmd, name_ARG);
if (!apply_lvname_restrictions(lp->lv_split_name))
return_0;
lp->keep_mimages = 1;
if (arg_sign_value(cmd, mirrors_ARG, 0) == SIGN_MINUS) {
log_error("Argument to --splitmirrors"
" cannot be negative");
return 0;
}
lp->mirrors = arg_uint_value(cmd, splitmirrors_ARG, 0);
lp->mirrors_sign = SIGN_MINUS;
} else if (arg_count(cmd, name_ARG)) {
log_error("The 'name' argument is only valid"
" with --splitmirrors");
return 0;
}
if (arg_count(cmd, merge_ARG))
lp->merge = 1;
if (arg_count(cmd, mirrors_ARG)) {
/*
* --splitmirrors has been chosen as the mechanism for
* specifying the intent of detaching and keeping a mimage
* versus an additional qualifying argument being added here.
*/
lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 0);
lp->mirrors_sign = arg_sign_value(cmd, mirrors_ARG, 0);
}
lp->alloc = arg_uint_value(cmd, alloc_ARG, ALLOC_INHERIT);
/* There are three types of lvconvert. */
if (lp->merge) { /* Snapshot merge */
if (arg_count(cmd, regionsize_ARG) || arg_count(cmd, chunksize_ARG) ||
arg_count(cmd, zero_ARG) || arg_count(cmd, regionsize_ARG) ||
arg_count(cmd, stripes_long_ARG) || arg_count(cmd, stripesize_ARG)) {
log_error("Only --background and --interval are valid "
"arguments for snapshot merge");
return 0;
}
if (!(lp->segtype = get_segtype_from_string(cmd, "snapshot")))
return_0;
} else if (lp->snapshot) { /* Snapshot creation from pre-existing cow */
if (arg_count(cmd, regionsize_ARG)) {
log_error("--regionsize is only available with mirrors");
return 0;
}
if (arg_count(cmd, stripesize_ARG) || arg_count(cmd, stripes_long_ARG)) {
log_error("--stripes and --stripesize are only available with striped mirrors");
return 0;
}
if (arg_sign_value(cmd, chunksize_ARG, 0) == SIGN_MINUS) {
log_error("Negative chunk size is invalid");
return 0;
}
lp->chunk_size = arg_uint_value(cmd, chunksize_ARG, 8);
if (lp->chunk_size < 8 || lp->chunk_size > 1024 ||
(lp->chunk_size & (lp->chunk_size - 1))) {
log_error("Chunk size must be a power of 2 in the "
"range 4K to 512K");
return 0;
}
log_verbose("Setting chunksize to %d sectors.", lp->chunk_size);
if (!(lp->segtype = get_segtype_from_string(cmd, "snapshot")))
return_0;
lp->zero = strcmp(arg_str_value(cmd, zero_ARG,
(lp->segtype->flags &
SEG_CANNOT_BE_ZEROED) ?
"n" : "y"), "n");
} else { /* Mirrors */
if (arg_count(cmd, chunksize_ARG)) {
log_error("--chunksize is only available with "
"snapshots");
return 0;
}
if (arg_count(cmd, zero_ARG)) {
log_error("--zero is only available with snapshots");
return 0;
}
/*
* --regionsize is only valid if converting an LV into a mirror.
* Checked when we know the state of the LV being converted.
*/
if (arg_count(cmd, regionsize_ARG)) {
if (arg_sign_value(cmd, regionsize_ARG, 0) ==
SIGN_MINUS) {
log_error("Negative regionsize is invalid");
return 0;
}
lp->region_size = arg_uint_value(cmd, regionsize_ARG, 0);
} else {
region_size = 2 * find_config_tree_int(cmd,
"activation/mirror_region_size",
DEFAULT_MIRROR_REGION_SIZE);
if (region_size < 0) {
log_error("Negative regionsize in "
"configuration file is invalid");
return 0;
}
lp->region_size = region_size;
}
if (lp->region_size % (pagesize >> SECTOR_SHIFT)) {
log_error("Region size (%" PRIu32 ") must be "
"a multiple of machine memory "
"page size (%d)",
lp->region_size, pagesize >> SECTOR_SHIFT);
return 0;
}
if (lp->region_size & (lp->region_size - 1)) {
log_error("Region size (%" PRIu32
") must be a power of 2", lp->region_size);
return 0;
}
if (!lp->region_size) {
log_error("Non-zero region size must be supplied.");
return 0;
}
/* Default is never striped, regardless of existing LV configuration. */
if (!get_stripe_params(cmd, &lp->stripes, &lp->stripe_size)) {
stack;
return 0;
}
if (!(lp->segtype = get_segtype_from_string(cmd, "mirror")))
return_0;
}
if (activation() && lp->segtype->ops->target_present &&
!lp->segtype->ops->target_present(cmd, NULL, NULL)) {
log_error("%s: Required device-mapper target(s) not "
"detected in your kernel", lp->segtype->name);
return 0;
}
if (!_lvconvert_name_params(lp, cmd, &argc, &argv))
return_0;
lp->pv_count = argc;
lp->pvs = argv;
lp->failed_pvs = NULL;
return 1;
}
static struct volume_group *_get_lvconvert_vg(struct cmd_context *cmd,
const char *name,
const char *uuid __attribute((unused)))
{
dev_close_all();
if (name && !strchr(name, '/'))
return vg_read_for_update(cmd, name, NULL, 0);
/* 'name' is the full LV name; must extract_vgname() */
return vg_read_for_update(cmd, extract_vgname(cmd, name),
NULL, 0);
}
static struct logical_volume *_get_lvconvert_lv(struct cmd_context *cmd __attribute((unused)),
struct volume_group *vg,
const char *name,
const char *uuid,
uint32_t lv_type __attribute((unused)))
{
struct logical_volume *lv = find_lv(vg, name);
if (!lv || (uuid && strcmp(uuid, (char *)&lv->lvid)))
return NULL;
return lv;
}
static int _finish_lvconvert_mirror(struct cmd_context *cmd,
struct volume_group *vg,
struct logical_volume *lv,
struct dm_list *lvs_changed __attribute((unused)))
{
int r = 0;
if (!(lv->status & CONVERTING))
return 1;
if (!collapse_mirrored_lv(lv)) {
log_error("Failed to remove temporary sync layer.");
return 0;
}
lv->status &= ~CONVERTING;
log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
if (!vg_write(vg))
return_0;
if (!suspend_lv(cmd, lv)) {
log_error("Failed to lock %s", lv->name);
vg_revert(vg);
goto out;
}
if (!vg_commit(vg)) {
resume_lv(cmd, lv);
goto_out;
}
log_very_verbose("Updating \"%s\" in kernel", lv->name);
if (!resume_lv(cmd, lv)) {
log_error("Problem reactivating %s", lv->name);
goto out;
}
r = 1;
log_print("Logical volume %s converted.", lv->name);
out:
backup(vg);
return r;
}
static int _finish_lvconvert_merge(struct cmd_context *cmd,
struct volume_group *vg,
struct logical_volume *lv,
struct dm_list *lvs_changed __attribute((unused)))
{
struct lv_segment *snap_seg = find_merging_cow(lv);
if (!snap_seg) {
log_error("Logical volume %s has no merging snapshot.", lv->name);
return 0;
}
log_print("Merge of snapshot into logical volume %s has finished.", lv->name);
if (!lv_remove_single(cmd, snap_seg->cow, DONT_PROMPT)) {
log_error("Could not remove snapshot %s merged into %s.",
snap_seg->cow->name, lv->name);
return 0;
}
return 1;
}
static progress_t _poll_merge_progress(struct cmd_context *cmd,
struct logical_volume *lv,
const char *name __attribute((unused)),
struct daemon_parms *parms)
{
float percent = 0.0;
percent_range_t percent_range;
if (!lv_snapshot_percent(lv, &percent, &percent_range)) {
log_error("%s: Failed query for merging percentage. Aborting merge.", lv->name);
return PROGRESS_CHECK_FAILED;
} else if (percent_range == PERCENT_INVALID) {
log_error("%s: Merging snapshot invalidated. Aborting merge.", lv->name);
return PROGRESS_CHECK_FAILED;
}
if (parms->progress_display)
log_print("%s: %s: %.1f%%", lv->name, parms->progress_title, percent);
else
log_verbose("%s: %s: %.1f%%", lv->name, parms->progress_title, percent);
if (percent_range == PERCENT_0)
return PROGRESS_FINISHED_ALL;
return PROGRESS_UNFINISHED;
}
static struct poll_functions _lvconvert_mirror_fns = {
.get_copy_vg = _get_lvconvert_vg,
.get_copy_lv = _get_lvconvert_lv,
.poll_progress = poll_mirror_progress,
.finish_copy = _finish_lvconvert_mirror,
};
static struct poll_functions _lvconvert_merge_fns = {
.get_copy_vg = _get_lvconvert_vg,
.get_copy_lv = _get_lvconvert_lv,
.poll_progress = _poll_merge_progress,
.finish_copy = _finish_lvconvert_merge,
};
int lvconvert_poll(struct cmd_context *cmd, struct logical_volume *lv,
unsigned background)
{
/*
* FIXME allocate an "object key" structure with split
* out members (vg_name, lv_name, uuid, etc) and pass that
* around the lvconvert and polldaemon code
* - will avoid needless work, e.g. extract_vgname()
* - unfortunately there are enough overloaded "name" dragons in
* the polldaemon, lvconvert, pvmove code that a comprehensive
* audit/rework is needed
*/
int len = strlen(lv->vg->name) + strlen(lv->name) + 2;
char *uuid = alloca(sizeof(lv->lvid));
char *lv_full_name = alloca(len);
if (!uuid || !lv_full_name)
return_0;
if (!dm_snprintf(lv_full_name, len, "%s/%s", lv->vg->name, lv->name))
return_0;
memcpy(uuid, &lv->lvid, sizeof(lv->lvid));
if (!lv_is_merging_origin(lv))
return poll_daemon(cmd, lv_full_name, uuid, background, 0,
&_lvconvert_mirror_fns, "Converted");
else
return poll_daemon(cmd, lv_full_name, uuid, background, 0,
&_lvconvert_merge_fns, "Merged");
}
static int _insert_lvconvert_layer(struct cmd_context *cmd,
struct logical_volume *lv)
{
char *format, *layer_name;
size_t len;
int i;
/*
* We would like to give the same number for this layer
* and the newly added mimage.
* However, LV name of newly added mimage is determined *after*
* the LV name of this layer is determined.
*
* So, use generate_lv_name() to generate mimage name first
* and take the number from it.
*/
len = strlen(lv->name) + 32;
if (!(format = alloca(len)) ||
!(layer_name = alloca(len)) ||
dm_snprintf(format, len, "%s_mimage_%%d", lv->name) < 0) {
log_error("lvconvert: layer name allocation failed.");
return 0;
}
if (!generate_lv_name(lv->vg, format, layer_name, len) ||
sscanf(layer_name, format, &i) != 1) {
log_error("lvconvert: layer name generation failed.");
return 0;
}
if (dm_snprintf(layer_name, len, MIRROR_SYNC_LAYER "_%d", i) < 0) {
log_error("layer name allocation failed.");
return 0;
}
if (!insert_layer_for_lv(cmd, lv, 0, layer_name)) {
log_error("Failed to insert resync layer");
return 0;
}
return 1;
}
static int _area_missing(struct lv_segment *lvseg, int s)
{
if (seg_type(lvseg, s) == AREA_LV) {
if (seg_lv(lvseg, s)->status & PARTIAL_LV)
return 1;
} else if ((seg_type(lvseg, s) == AREA_PV) &&
(is_missing_pv(seg_pv(lvseg, s))))
return 1;
return 0;
}
/* FIXME we want to handle mirror stacks here... */
static int _failed_mirrors_count(struct logical_volume *lv)
{
struct lv_segment *lvseg;
int ret = 0;
int s;
dm_list_iterate_items(lvseg, &lv->segments) {
if (!seg_is_mirrored(lvseg))
return -1;
for (s = 0; s < lvseg->area_count; s++)
if (_area_missing(lvseg, s))
ret++;
}
return ret;
}
static struct dm_list *_failed_pv_list(struct volume_group *vg)
{
struct dm_list *failed_pvs;
struct pv_list *pvl, *new_pvl;
if (!(failed_pvs = dm_pool_alloc(vg->vgmem, sizeof(*failed_pvs)))) {
log_error("Allocation of list of failed_pvs failed.");
return_NULL;
}
dm_list_init(failed_pvs);
dm_list_iterate_items(pvl, &vg->pvs) {
if (!is_missing_pv(pvl->pv))
continue;
/*
* Finally, --repair will remove empty PVs.
* But we only want remove these which are output of repair,
* Do not count these which are already empty here.
* FIXME: code should traverse PV in LV not in whole VG.
* FIXME: layer violation? should it depend on vgreduce --removemising?
*/
if (pvl->pv->pe_alloc_count == 0)
continue;
if (!(new_pvl = dm_pool_alloc(vg->vgmem, sizeof(*new_pvl)))) {
log_error("Allocation of failed_pvs list entry failed.");
return_NULL;
}
new_pvl->pv = pvl->pv;
dm_list_add(failed_pvs, &new_pvl->list);
}
return failed_pvs;
}
/*
* Walk down the stacked mirror LV to the original mirror LV.
*/
static struct logical_volume *_original_lv(struct logical_volume *lv)
{
struct logical_volume *next_lv = lv, *tmp_lv;
while ((tmp_lv = find_temporary_mirror(next_lv)))
next_lv = tmp_lv;
return next_lv;
}
static void _lvconvert_mirrors_repair_ask(struct cmd_context *cmd,
int failed_log, int failed_mirrors,
int *replace_log, int *replace_mirrors)
{
const char *leg_policy = NULL, *log_policy = NULL;
int force = arg_count(cmd, force_ARG);
int yes = arg_count(cmd, yes_ARG);
*replace_log = *replace_mirrors = 1;
if (arg_count(cmd, use_policies_ARG)) {
leg_policy = find_config_tree_str(cmd,
"activation/mirror_image_fault_policy", NULL);
if (!leg_policy)
leg_policy = find_config_tree_str(cmd,
"activation/mirror_device_fault_policy",
DEFAULT_MIRROR_DEVICE_FAULT_POLICY);
log_policy = find_config_tree_str(cmd,
"activation/mirror_log_fault_policy",
DEFAULT_MIRROR_LOG_FAULT_POLICY);
*replace_mirrors = strcmp(leg_policy, "remove");
*replace_log = strcmp(log_policy, "remove");
return;
}
if (yes)
return;
if (force != PROMPT) {
*replace_log = *replace_mirrors = 0;
return;
}
if (failed_log &&
yes_no_prompt("Attempt to replace failed mirror log? [y/n]: ") == 'n') {
*replace_log = 0;
}
if (failed_mirrors &&
yes_no_prompt("Attempt to replace failed mirror images "
"(requires full device resync)? [y/n]: ") == 'n') {
*replace_mirrors = 0;
}
}
/*
* _get_log_count
* @lv: the mirror LV
*
* Get the number of on-disk copies of the log.
* 0 = 'core'
* 1 = 'disk'
* 2+ = 'mirrored'
*/
static int _get_log_count(struct logical_volume *lv)
{
struct logical_volume *log_lv;
log_lv = first_seg(_original_lv(lv))->log_lv;
if (!log_lv)
return 0;
return lv_mirror_count(log_lv);
}
static int _lv_update_log_type(struct cmd_context *cmd,
struct lvconvert_params *lp,
struct logical_volume *lv,
struct dm_list *operable_pvs,
int log_count)
{
uint32_t region_size;
int old_log_count;
struct logical_volume *original_lv;
struct logical_volume *log_lv;
old_log_count = _get_log_count(lv);
if (old_log_count == log_count)
return 1;
original_lv = _original_lv(lv);
region_size = adjusted_mirror_region_size(lv->vg->extent_size,
lv->le_count,
lp->region_size);
/* Add a log where there is none */
if (!old_log_count) {
if (!add_mirror_log(cmd, original_lv, log_count,
region_size, operable_pvs, lp->alloc))
return_0;
return 1;
}
/* Remove an existing log completely */
if (!log_count) {
if (!remove_mirror_log(cmd, original_lv, operable_pvs))
return_0;
return 1;
}
log_lv = first_seg(original_lv)->log_lv;
/* Adding redundancy to the log */
if (old_log_count < log_count) {
log_error("Adding log redundancy not supported yet.");
log_error("Try converting the log to 'core' first.");
return_0;
}
/* Reducing redundancy of the log */
return remove_mirror_images(log_lv, log_count, operable_pvs, 1U);
}
/*
* Reomove missing and empty PVs from VG, if are also in provided list
*/
static void _remove_missing_empty_pv(struct volume_group *vg, struct dm_list *remove_pvs)
{
struct pv_list *pvl, *pvl_vg, *pvlt;
int removed = 0;
if (!remove_pvs)
return;
dm_list_iterate_items(pvl, remove_pvs) {
dm_list_iterate_items_safe(pvl_vg, pvlt, &vg->pvs) {
if (!id_equal(&pvl->pv->id, &pvl_vg->pv->id) ||
!is_missing_pv(pvl_vg->pv) ||
pvl_vg->pv->pe_alloc_count != 0)
continue;
/* FIXME: duplication of vgreduce code, move this to library */
vg->free_count -= pvl_vg->pv->pe_count;
vg->extent_count -= pvl_vg->pv->pe_count;
del_pvl_from_vgs(vg, pvl_vg);
removed++;
}
}
if (removed) {
if (!vg_write(vg) || !vg_commit(vg)) {
stack;
return;
}
log_warn("%d missing and now unallocated Physical Volumes removed from VG.", removed);
}
}
/*
* _lvconvert_mirrors_parse_params
*
* This function performs the following:
* 1) Gets the old values of mimage and log counts
* 2) Parses the CLI args to find the new desired values
* 3) Adjusts 'lp->mirrors' to the appropriate absolute value.
* (Remember, 'lp->mirrors' is specified in terms of the number of "copies"
* vs. the number of mimages. It can also be a relative value.)
* 4) Sets 'lp->need_polling' if collapsing
* 5) Validates other mirror params
*
* Returns: 1 on success, 0 on error
*/
static int _lvconvert_mirrors_parse_params(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp,
uint32_t *old_mimage_count,
uint32_t *old_log_count,
uint32_t *new_mimage_count,
uint32_t *new_log_count)
{
int repair = arg_count(cmd, repair_ARG);
const char *mirrorlog;
*old_mimage_count = lv_mirror_count(lv);
*old_log_count = _get_log_count(lv);
/*
* Collapsing a stack of mirrors:
*
* If called with no argument, try collapsing the resync layers
*/
if (!arg_count(cmd, mirrors_ARG) && !arg_count(cmd, mirrorlog_ARG) &&
!arg_count(cmd, corelog_ARG) && !arg_count(cmd, regionsize_ARG) &&
!arg_count(cmd, splitmirrors_ARG) && !repair) {
*new_mimage_count = *old_mimage_count;
*new_log_count = *old_log_count;
if (find_temporary_mirror(lv) || (lv->status & CONVERTING))
lp->need_polling = 1;
return 1;
}
if ((arg_count(cmd, mirrors_ARG) && repair) ||
(arg_count(cmd, mirrorlog_ARG) && repair) ||
(arg_count(cmd, corelog_ARG) && repair)) {
log_error("--repair cannot be used with --mirrors, --mirrorlog,"
" or --corelog");
return 0;
}
if (arg_count(cmd, mirrorlog_ARG) && arg_count(cmd, corelog_ARG)) {
log_error("--mirrorlog and --corelog are incompatible");
return 0;
}
/*
* Adjusting mimage count?
*/
if (!arg_count(cmd, mirrors_ARG) && !arg_count(cmd, splitmirrors_ARG))
lp->mirrors = *old_mimage_count;
else if (lp->mirrors_sign == SIGN_PLUS)
lp->mirrors = *old_mimage_count + lp->mirrors;
else if (lp->mirrors_sign == SIGN_MINUS)
lp->mirrors = *old_mimage_count - lp->mirrors;
else
lp->mirrors += 1;
*new_mimage_count = lp->mirrors;
/* Too many mimages? */
if (lp->mirrors > DEFAULT_MIRROR_MAX_IMAGES) {
log_error("Only up to %d images in mirror supported currently.",
DEFAULT_MIRROR_MAX_IMAGES);
return 0;
}
/* Did the user try to subtract more legs than available? */
if (lp->mirrors < 1) {
log_error("Logical volume %s only has %" PRIu32 " mirrors.",
lv->name, *old_mimage_count);
return 0;
}
/*
* FIXME: It would be nice to say what we are adjusting to, but
* I really don't know whether to specify the # of copies or mimages.
*/
if (*old_mimage_count != *new_mimage_count)
log_verbose("Adjusting mirror image count of %s", lv->name);
/*
* Adjust log type
*
* If we are converting from a mirror to another mirror or simply
* changing the log type, we start by assuming they want the log
* type the same and then parse the given args. OTOH, If we are
* converting from linear to mirror, then we start from the default
* position that the user would like a 'disk' log.
*/
*new_log_count = (*old_mimage_count > 1) ? *old_log_count : 1;
if (!arg_count(cmd, corelog_ARG) && !arg_count(cmd, mirrorlog_ARG))
return 1;
if (arg_count(cmd, corelog_ARG))
*new_log_count = 0;
mirrorlog = arg_str_value(cmd, mirrorlog_ARG,
!*new_log_count ? "core" : DEFAULT_MIRRORLOG);
if (!strcmp("mirrored", mirrorlog))
*new_log_count = 2;
else if (!strcmp("disk", mirrorlog))
*new_log_count = 1;
else if (!strcmp("core", mirrorlog))
*new_log_count = 0;
else {
log_error("Unknown mirrorlog type: %s", mirrorlog);
return 0;
}
log_verbose("Setting logging type to %s", mirrorlog);
/*
* Region size must not change on existing mirrors
*/
if (arg_count(cmd, regionsize_ARG) && (lv->status & MIRRORED) &&
(lp->region_size != first_seg(lv)->region_size)) {
log_error("Mirror log region size cannot be changed on "
"an existing mirror.");
return 0;
}
/*
* For the most part, we cannot handle multi-segment mirrors. Bail out
* early if we have encountered one.
*/
if ((lv->status & MIRRORED) && dm_list_size(&lv->segments) != 1) {
log_error("Logical volume %s has multiple "
"mirror segments.", lv->name);
return 0;
}
return 1;
}
/*
* _lvconvert_mirrors_aux
*
* Add/remove mirror images and adjust log type. 'operable_pvs'
* are the set of PVs open to removal or allocation - depending
* on the operation being performed.
*/
static int _lvconvert_mirrors_aux(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp,
struct dm_list *operable_pvs,
uint32_t new_mimage_count,
uint32_t new_log_count)
{
uint32_t region_size;
struct lv_segment *seg;
struct logical_volume *layer_lv;
uint32_t old_mimage_count = lv_mirror_count(lv);
uint32_t old_log_count = _get_log_count(lv);
if ((lp->mirrors == 1) && !(lv->status & MIRRORED)) {
log_error("Logical volume %s is already not mirrored.",
lv->name);
return 1;
}
region_size = adjusted_mirror_region_size(lv->vg->extent_size,
lv->le_count,
lp->region_size);
if (!operable_pvs)
operable_pvs = lp->pvh;
seg = first_seg(lv);
/*
* Up-convert from linear to mirror
*/
if (!(lv->status & MIRRORED)) {
/* FIXME Share code with lvcreate */
/*
* FIXME should we give not only lp->pvh, but also all PVs
* currently taken by the mirror? Would make more sense from
* user perspective.
*/
if (!lv_add_mirrors(cmd, lv, new_mimage_count - 1, lp->stripes,
lp->stripe_size, region_size, new_log_count, operable_pvs,
lp->alloc, MIRROR_BY_LV)) {
stack;
return 0;
}
if (lp->wait_completion)
lp->need_polling = 1;
goto out;
}
/*
* Up-convert m-way mirror to n-way mirror
*/
if (new_mimage_count > old_mimage_count) {
if (lv->status & MIRROR_NOTSYNCED) {
log_error("Can't add mirror to out-of-sync mirrored "
"LV: use lvchange --resync first.");
return 0;
}
/*
* We allow snapshots of mirrors, but for now, we
* do not allow up converting mirrors that are under
* snapshots. The layering logic is somewhat complex,
* and preliminary test show that the conversion can't
* seem to get the correct %'age of completion.
*/
if (lv_is_origin(lv)) {
log_error("Can't add additional mirror images to "
"mirrors that are under snapshots");
return 0;
}
/*
* Is there already a convert in progress? We do not
* currently allow more than one.
*/
if (find_temporary_mirror(lv) || (lv->status & CONVERTING)) {
log_error("%s is already being converted. Unable to start another conversion.",
lv->name);
return 0;
}
/*
* Log addition/removal should be done before the layer
* insertion to make the end result consistent with
* linear-to-mirror conversion.
*/
if (!_lv_update_log_type(cmd, lp, lv,
operable_pvs, new_log_count)) {
stack;
return 0;
}
/* Insert a temporary layer for syncing,
* only if the original lv is using disk log. */
if (seg->log_lv && !_insert_lvconvert_layer(cmd, lv)) {
log_error("Failed to insert resync layer");
return 0;
}
/* FIXME: can't have multiple mlogs. force corelog. */
if (!lv_add_mirrors(cmd, lv,
new_mimage_count - old_mimage_count, lp->stripes, lp->stripe_size,
region_size, 0U, operable_pvs, lp->alloc,
MIRROR_BY_LV)) {
layer_lv = seg_lv(first_seg(lv), 0);
if (!remove_layer_from_lv(lv, layer_lv) ||
!deactivate_lv(cmd, layer_lv) ||
!lv_remove(layer_lv) || !vg_write(lv->vg) ||
!vg_commit(lv->vg)) {
log_error("ABORTING: Failed to remove "
"temporary mirror layer %s.",
layer_lv->name);
log_error("Manual cleanup with vgcfgrestore "
"and dmsetup may be required.");
return 0;
}
stack;
return 0;
}
if (seg->log_lv)
lv->status |= CONVERTING;
lp->need_polling = 1;
goto out_skip_log_convert;
}
/*
* Down-convert (reduce # of mimages).
*/
if (new_mimage_count < old_mimage_count) {
uint32_t nmc = old_mimage_count - new_mimage_count;
uint32_t nlc = (!new_log_count || lp->mirrors == 1) ? 1U : 0U;
/* FIXME: Why did nlc used to be calculated that way? */
/* Reduce number of mirrors */
if (lp->keep_mimages) {
if (!lv_split_mirror_images(lv, lp->lv_split_name,
nmc, operable_pvs))
return 0;
} else if (!lv_remove_mirrors(cmd, lv, nmc, nlc,
operable_pvs, 0))
return_0;
goto out; /* Just in case someone puts code between */
}
out:
/*
* Converting the log type
*/
if ((lv->status & MIRRORED) && (old_log_count != new_log_count)) {
if (!_lv_update_log_type(cmd, lp, lv,
operable_pvs, new_log_count)) {
stack;
return 0;
}
}
out_skip_log_convert:
log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
if (!vg_write(lv->vg))
return_0;
if (!suspend_lv(cmd, lv)) {
log_error("Failed to lock %s", lv->name);
vg_revert(lv->vg);
goto out;
}
if (!vg_commit(lv->vg)) {
if (!resume_lv(cmd, lv))
stack;
goto_out;
}
log_very_verbose("Updating \"%s\" in kernel", lv->name);
if (!resume_lv(cmd, lv)) {
log_error("Problem reactivating %s", lv->name);
goto out;
}
return 1;
}
/*
* _lvconvert_mirrors_repair
*
* This function operates in two phases. First, all of the bad
* devices are removed from the mirror. Then, if desired by the
* user, the devices are replaced.
*
* 'old_mimage_count' and 'old_log_count' are there so we know
* what to convert to after the removal of devices.
*/
static int _lvconvert_mirrors_repair(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp,
uint32_t old_mimage_count,
uint32_t old_log_count)
{
int failed_log = 0;
int failed_mirrors = 0;
int replace_log = 0;
int replace_mirrors = 0;
uint32_t new_log_count, log_count;
struct dm_list *failed_pvs = NULL;
struct logical_volume *log_lv;
cmd->handles_missing_pvs = 1;
cmd->partial_activation = 1;
lp->need_polling = 0;
if (!(lv->status & PARTIAL_LV)) {
log_error("%s is consistent. Nothing to repair.", lv->name);
return 1;
}
/*
* Count the failed mimages - negative if 'lv' is not a mirror
*/
if ((failed_mirrors = _failed_mirrors_count(lv)) < 0)
return_0;
lp->mirrors = old_mimage_count - failed_mirrors;
if (lp->mirrors != old_mimage_count)
log_error("Mirror status: %d of %d images failed.",
failed_mirrors, old_mimage_count);
/*
* Count the failed log devices
*/
new_log_count = old_log_count;
log_lv = first_seg(lv)->log_lv;
if (log_lv) {
new_log_count = lv_mirror_count(log_lv);
if (log_lv->status & PARTIAL_LV) {
failed_log = 1;
if (log_lv->status & MIRRORED)
new_log_count -= _failed_mirrors_count(log_lv);
else
new_log_count = 0;
}
}
if (old_log_count != new_log_count)
log_error("Mirror log status: %d of %d images failed%s",
old_log_count - new_log_count, old_log_count,
(!new_log_count) ? " - switching to core" : "");
/*
* Find out our policies
*/
_lvconvert_mirrors_repair_ask(cmd, failed_log, failed_mirrors,
&replace_log, &replace_mirrors);
/*
* First phase - remove faulty devices
*/
if (!(failed_pvs = _failed_pv_list(lv->vg)))
return_0;
/*
* We must adjust the log first, or the entire mirror
* will get stuck during a suspend.
*/
if (!_lv_update_log_type(cmd, lp, lv, failed_pvs, new_log_count))
return 0;
/*
* Remove all failed_pvs
*/
if (!_lvconvert_mirrors_aux(cmd, lv, lp, failed_pvs,
lp->mirrors, new_log_count))
return 0;
/*
* Second phase - replace faulty devices
*/
if (replace_mirrors)
lp->mirrors = old_mimage_count;
log_count = replace_log ? old_log_count : new_log_count;
while (replace_mirrors || replace_log) {
log_warn("Trying to up-convert to %d images, %d logs.", lp->mirrors, log_count);
if (_lvconvert_mirrors_aux(cmd, lv, lp, NULL,
lp->mirrors, log_count))
break;
else {
if (lp->mirrors > 2)
-- lp->mirrors;
else if (log_count > 0)
-- log_count;
else
break; /* nowhere to go, anymore... */
}
}
if (lp->mirrors != old_mimage_count)
log_warn("WARNING: Failed to replace %d of %d images in volume %s",
old_mimage_count - lp->mirrors, old_mimage_count, lv->name);
if (log_count != old_log_count)
log_warn("WARNING: Failed to replace %d of %d logs in volume %s",
old_log_count - log_count, old_log_count, lv->name);
/* if (!arg_count(cmd, use_policies_ARG) && (lp->mirrors != old_mimage_count
|| log_count != old_log_count))
return 0; */
return 1;
}
/*
* _lvconvert_mirrors
*
* Determine what is being done. Are we doing a conversion, repair, or
* collapsing a stack? Once determined, call helper functions.
*/
static int _lvconvert_mirrors(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp)
{
int repair = arg_count(cmd, repair_ARG);
uint32_t old_mimage_count;
uint32_t old_log_count;
uint32_t new_mimage_count;
uint32_t new_log_count;
/* Adjust mimage and/or log count */
if (!_lvconvert_mirrors_parse_params(cmd, lv, lp,
&old_mimage_count, &old_log_count,
&new_mimage_count, &new_log_count))
return 0;
/* Nothing to do? (Probably finishing collapse.) */
if ((old_mimage_count == new_mimage_count) &&
(old_log_count == new_log_count) && !repair)
return 1;
if (repair)
return _lvconvert_mirrors_repair(cmd, lv, lp,
old_mimage_count,
old_log_count);
if (!_lvconvert_mirrors_aux(cmd, lv, lp, NULL,
new_mimage_count, new_log_count))
return 0;
if (!lp->need_polling)
log_print("Logical volume %s converted.", lv->name);
backup(lv->vg);
return 1;
}
static int lvconvert_snapshot(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp)
{
struct logical_volume *org;
int r = 0;
if (!(org = find_lv(lv->vg, lp->origin))) {
log_error("Couldn't find origin volume '%s'.", lp->origin);
return 0;
}
if (org == lv) {
log_error("Unable to use \"%s\" as both snapshot and origin.",
lv->name);
return 0;
}
if (org->status & (LOCKED|PVMOVE|MIRRORED) || lv_is_cow(org)) {
log_error("Unable to create a snapshot of a %s LV.",
org->status & LOCKED ? "locked" :
org->status & PVMOVE ? "pvmove" :
org->status & MIRRORED ? "mirrored" :
"snapshot");
return 0;
}
if (!lp->zero || !(lv->status & LVM_WRITE))
log_warn("WARNING: \"%s\" not zeroed", lv->name);
else if (!set_lv(cmd, lv, UINT64_C(0), 0)) {
log_error("Aborting. Failed to wipe snapshot "
"exception store.");
return 0;
}
if (!deactivate_lv(cmd, lv)) {
log_error("Couldn't deactivate LV %s.", lv->name);
return 0;
}
if (!vg_add_snapshot(org, lv, NULL, org->le_count, lp->chunk_size)) {
log_error("Couldn't create snapshot.");
return 0;
}
/* store vg on disk(s) */
if (!vg_write(lv->vg))
return_0;
if (!suspend_lv(cmd, org)) {
log_error("Failed to suspend origin %s", org->name);
vg_revert(lv->vg);
goto out;
}
if (!vg_commit(lv->vg))
goto_out;
if (!resume_lv(cmd, org)) {
log_error("Problem reactivating origin %s", org->name);
goto out;
}
log_print("Logical volume %s converted to snapshot.", lv->name);
r = 1;
out:
backup(lv->vg);
return r;
}
static int lvconvert_merge(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp)
{
int r = 0;
int merge_on_activate = 0;
struct logical_volume *origin = origin_from_cow(lv);
struct lv_segment *cow_seg = find_cow(lv);
struct lvinfo info;
/* Check if merge is possible */
if (lv_is_merging_cow(lv)) {
log_error("Snapshot %s is already merging", lv->name);
return 0;
}
if (lv_is_merging_origin(origin)) {
log_error("Snapshot %s is already merging into the origin",
find_merging_cow(origin)->cow->name);
return 0;
}
/*
* Prevent merge with open device(s) as it would likely lead
* to application/filesystem failure. Merge on origin's next
* activation if either the origin or snapshot LV are currently
* open.
*
* FIXME testing open_count is racey; snapshot-merge target's
* constructor and DM should prevent appropriate devices from
* being open.
*/
if (lv_info(cmd, origin, &info, 1, 0)) {
if (info.open_count) {
log_error("Can't merge over open origin volume");
merge_on_activate = 1;
}
}
if (lv_info(cmd, lv, &info, 1, 0)) {
if (info.open_count) {
log_print("Can't merge when snapshot is open");
merge_on_activate = 1;
}
}
init_snapshot_merge(cow_seg, origin);
/* store vg on disk(s) */
if (!vg_write(lv->vg))
return_0;
if (merge_on_activate) {
/* commit vg but skip starting the merge */
if (!vg_commit(lv->vg))
return_0;
r = 1;
log_print("Merging of snapshot %s will start "
"next activation.", lv->name);
goto out;
}
/* Perform merge */
if (!suspend_lv(cmd, origin)) {
log_error("Failed to suspend origin %s", origin->name);
vg_revert(lv->vg);
goto out;
}
if (!vg_commit(lv->vg)) {
if (!resume_lv(cmd, origin))
stack;
goto_out;
}
if (!resume_lv(cmd, origin)) {
log_error("Failed to reactivate origin %s", origin->name);
goto out;
}
lp->need_polling = 1;
lp->lv_to_poll = origin;
r = 1;
log_print("Merging of volume %s started.", lv->name);
out:
backup(lv->vg);
return r;
}
static int _lvconvert_single(struct cmd_context *cmd, struct logical_volume *lv,
void *handle)
{
struct lvconvert_params *lp = handle;
if (lv->status & LOCKED) {
log_error("Cannot convert locked LV %s", lv->name);
return ECMD_FAILED;
}
if (lv_is_cow(lv) && !lp->merge) {
log_error("Can't convert snapshot logical volume \"%s\"",
lv->name);
return ECMD_FAILED;
}
if (lv->status & PVMOVE) {
log_error("Unable to convert pvmove LV %s", lv->name);
return ECMD_FAILED;
}
if (arg_count(cmd, repair_ARG) && !(lv->status & MIRRORED)) {
if (arg_count(cmd, use_policies_ARG))
return ECMD_PROCESSED; /* nothing to be done here */
log_error("Can't repair non-mirrored LV \"%s\".", lv->name);
return ECMD_FAILED;
}
if (lp->merge) {
if (!lv_is_cow(lv)) {
log_error("Logical volume \"%s\" is not a snapshot",
lv->name);
return ECMD_FAILED;
}
if (!archive(lv->vg)) {
stack;
return ECMD_FAILED;
}
if (!lvconvert_merge(cmd, lv, lp)) {
stack;
return ECMD_FAILED;
}
} else if (lp->snapshot) {
if (lv->status & MIRRORED) {
log_error("Unable to convert mirrored LV \"%s\" into a snapshot.", lv->name);
return ECMD_FAILED;
}
if (!archive(lv->vg)) {
stack;
return ECMD_FAILED;
}
if (!lvconvert_snapshot(cmd, lv, lp)) {
stack;
return ECMD_FAILED;
}
} else if (arg_count(cmd, mirrors_ARG) || (lv->status & MIRRORED)) {
if (!archive(lv->vg)) {
stack;
return ECMD_FAILED;
}
if (!_lvconvert_mirrors(cmd, lv, lp)) {
stack;
return ECMD_FAILED;
}
/* If repairing and using policies, remove missing PVs from VG */
if (arg_count(cmd, repair_ARG) && arg_count(cmd, use_policies_ARG))
_remove_missing_empty_pv(lv->vg, lp->failed_pvs);
}
return ECMD_PROCESSED;
}
/*
* FIXME move to toollib along with the rest of the drop/reacquire
* VG locking that is used by lvconvert_merge_single()
*/
static struct logical_volume *get_vg_lock_and_logical_volume(struct cmd_context *cmd,
const char *vg_name,
const char *lv_name)
{
/*
* Returns NULL if the requested LV doesn't exist;
* otherwise the caller must vg_release(lv->vg)
* - it is also up to the caller to unlock_vg() as needed
*/
struct volume_group *vg;
struct logical_volume* lv = NULL;
vg = _get_lvconvert_vg(cmd, vg_name, NULL);
if (vg_read_error(vg)) {
vg_release(vg);
return_NULL;
}
if (!(lv = _get_lvconvert_lv(cmd, vg, lv_name, NULL, 0))) {
log_error("Can't find LV %s in VG %s", lv_name, vg_name);
unlock_and_release_vg(cmd, vg, vg_name);
return NULL;
}
return lv;
}
static int poll_logical_volume(struct cmd_context *cmd, struct logical_volume *lv,
int wait_completion)
{
struct lvinfo info;
if (!lv_info(cmd, lv, &info, 1, 0) || !info.exists) {
log_print("Conversion starts after activation.");
return ECMD_PROCESSED;
}
return lvconvert_poll(cmd, lv, wait_completion ? 0 : 1U);
}
static int lvconvert_single(struct cmd_context *cmd, struct lvconvert_params *lp)
{
struct logical_volume *lv = NULL;
int ret = ECMD_FAILED;
int saved_ignore_suspended_devices = ignore_suspended_devices();
if (arg_count(cmd, repair_ARG)) {
init_ignore_suspended_devices(1);
cmd->handles_missing_pvs = 1;
}
lv = get_vg_lock_and_logical_volume(cmd, lp->vg_name, lp->lv_name);
if (!lv)
goto_out;
/*
* lp->pvh holds the list of PVs available for allocation or removal
*/
if (lp->pv_count) {
if (!(lp->pvh = create_pv_list(cmd->mem, lv->vg, lp->pv_count,
lp->pvs, 0)))
goto_bad;
} else
lp->pvh = &lv->vg->pvs;
lp->lv_to_poll = lv;
ret = _lvconvert_single(cmd, lv, lp);
bad:
unlock_vg(cmd, lp->vg_name);
if (ret == ECMD_PROCESSED && lp->need_polling)
ret = poll_logical_volume(cmd, lp->lv_to_poll,
lp->wait_completion);
vg_release(lv->vg);
out:
init_ignore_suspended_devices(saved_ignore_suspended_devices);
return ret;
}
static int lvconvert_merge_single(struct cmd_context *cmd, struct logical_volume *lv,
void *handle)
{
struct lvconvert_params *lp = handle;
const char *vg_name = NULL;
struct logical_volume *refreshed_lv = NULL;
int ret;
/*
* FIXME can't trust lv's VG to be current given that caller
* is process_each_lv() -- poll_logical_volume() may have
* already updated the VG's metadata in an earlier iteration.
* - preemptively drop the VG lock, as is needed for
* poll_logical_volume(), refresh LV (and VG in the process).
*/
vg_name = lv->vg->name;
unlock_vg(cmd, vg_name);
refreshed_lv = get_vg_lock_and_logical_volume(cmd, vg_name, lv->name);
if (!refreshed_lv) {
log_error("ABORTING: Can't reread LV %s/%s", vg_name, lv->name);
return ECMD_FAILED;
}
lp->lv_to_poll = refreshed_lv;
ret = _lvconvert_single(cmd, refreshed_lv, lp);
if (ret == ECMD_PROCESSED && lp->need_polling) {
/*
* Must drop VG lock, because lvconvert_poll() needs it,
* then reacquire it after polling completes
*/
unlock_vg(cmd, vg_name);
ret = poll_logical_volume(cmd, lp->lv_to_poll,
lp->wait_completion);
/* use LCK_VG_WRITE to match lvconvert()'s READ_FOR_UPDATE */
if (!lock_vol(cmd, vg_name, LCK_VG_WRITE)) {
log_error("ABORTING: Can't relock VG for %s "
"after polling finished", vg_name);
ret = ECMD_FAILED;
}
}
vg_release(refreshed_lv->vg);
return ret;
}
int lvconvert(struct cmd_context * cmd, int argc, char **argv)
{
struct lvconvert_params lp;
if (!_read_params(&lp, cmd, argc, argv)) {
stack;
return EINVALID_CMD_LINE;
}
if (lp.merge)
return process_each_lv(cmd, argc, argv, READ_FOR_UPDATE, &lp,
&lvconvert_merge_single);
return lvconvert_single(cmd, &lp);
}
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