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lvm2/tools/lvconvert.c

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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 zero;
const char *origin;
const char *lv_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;
struct segment_type *segtype;
alloc_policy_t alloc;
int pv_count;
char **pvs;
struct dm_list *pvh;
};
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->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;
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, mirrorlog_ARG) || arg_count(cmd, mirrors_ARG))) {
log_error("--snapshots argument cannot be mixed "
"with --mirrors 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, mirrors_ARG)) {
lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 0);
lp->mirrors_sign = arg_sign_value(cmd, mirrors_ARG, 0);
}
lp->alloc = ALLOC_INHERIT;
if (arg_count(cmd, alloc_ARG))
lp->alloc = arg_uint_value(cmd, alloc_ARG, lp->alloc);
if (lp->snapshot) {
if (arg_count(cmd, regionsize_ARG)) {
log_error("--regionsize is only available with 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;
}
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;
return 1;
}
static struct volume_group *_get_lvconvert_vg(struct cmd_context *cmd,
const char *lv_name)
{
dev_close_all();
return vg_lock_and_read(cmd, extract_vgname(cmd, lv_name),
NULL, LCK_VG_WRITE,
CLUSTERED | EXPORTED_VG | LVM_WRITE,
CORRECT_INCONSISTENT | FAIL_INCONSISTENT);
}
static struct logical_volume *_get_lvconvert_lv(struct cmd_context *cmd __attribute((unused)),
struct volume_group *vg,
const char *name,
uint32_t lv_type __attribute((unused)))
{
return find_lv(vg, name);
}
static int _update_lvconvert_mirror(struct cmd_context *cmd __attribute((unused)),
struct volume_group *vg __attribute((unused)),
struct logical_volume *lv __attribute((unused)),
struct dm_list *lvs_changed __attribute((unused)),
unsigned flags __attribute((unused)))
{
/* lvconvert mirror doesn't require periodical metadata update */
return 1;
}
static int _finish_lvconvert_mirror(struct cmd_context *cmd,
struct volume_group *vg,
struct logical_volume *lv,
struct dm_list *lvs_changed __attribute((unused)))
{
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;
backup(vg);
if (!suspend_lv(cmd, lv)) {
log_error("Failed to lock %s", lv->name);
vg_revert(vg);
return 0;
}
if (!vg_commit(vg)) {
resume_lv(cmd, lv);
return 0;
}
log_very_verbose("Updating \"%s\" in kernel", lv->name);
if (!resume_lv(cmd, lv)) {
log_error("Problem reactivating %s", lv->name);
return 0;
}
log_print("Logical volume %s converted.", lv->name);
return 1;
}
static struct poll_functions _lvconvert_mirror_fns = {
.get_copy_vg = _get_lvconvert_vg,
.get_copy_lv = _get_lvconvert_lv,
.update_metadata = _update_lvconvert_mirror,
.finish_copy = _finish_lvconvert_mirror,
};
int lvconvert_poll(struct cmd_context *cmd, const char *lv_name,
unsigned background)
{
return poll_daemon(cmd, lv_name, background, 0, &_lvconvert_mirror_fns,
"Converted");
}
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;
}
/* 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 int lvconvert_mirrors(struct cmd_context * cmd, struct logical_volume * lv,
struct lvconvert_params *lp)
{
struct lv_segment *seg;
uint32_t existing_mirrors;
const char *mirrorlog;
unsigned corelog = 0;
struct logical_volume *original_lv;
seg = first_seg(lv);
existing_mirrors = lv_mirror_count(lv);
/* 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)) {
lp->need_polling = 1;
return 1;
}
/*
* Adjust required number of mirrors
*
* We check mirrors_ARG again to see if it
* was supplied. If not, they want the mirror
* count to remain the same. They may be changing
* the logging type.
*/
if (!arg_count(cmd, mirrors_ARG))
lp->mirrors = existing_mirrors;
else if (lp->mirrors_sign == SIGN_PLUS)
lp->mirrors = existing_mirrors + lp->mirrors;
else if (lp->mirrors_sign == SIGN_MINUS)
lp->mirrors = existing_mirrors - lp->mirrors;
else
lp->mirrors += 1;
/*
* 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, existing_mirrors);
return 0;
}
/*
* Adjust log type
*/
if (arg_count(cmd, corelog_ARG))
corelog = 1;
mirrorlog = arg_str_value(cmd, mirrorlog_ARG,
corelog ? "core" : DEFAULT_MIRRORLOG);
if (!strcmp("disk", mirrorlog)) {
if (corelog) {
log_error("--mirrorlog disk and --corelog "
"are incompatible");
return 0;
}
corelog = 0;
} else if (!strcmp("core", mirrorlog))
corelog = 1;
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 != seg->region_size)) {
log_error("Mirror log region size cannot be changed on "
"an existing mirror.");
return 0;
}
/*
* Converting from mirror to linear
*/
if ((lp->mirrors == 1)) {
if (!(lv->status & MIRRORED)) {
log_error("Logical volume %s is already not mirrored.",
lv->name);
return 1;
}
if (!lv_remove_mirrors(cmd, lv, existing_mirrors - 1, 1,
lp->pv_count ? lp->pvh : NULL, 0))
return_0;
goto commit_changes;
}
/*
* Converting from linear to mirror
*/
if (!(lv->status & MIRRORED)) {
/* FIXME Share code with lvcreate */
/* FIXME Why is this restriction here? Fix it! */
dm_list_iterate_items(seg, &lv->segments) {
if (seg_is_striped(seg) && seg->area_count > 1) {
log_error("Mirrors of striped volumes are not yet supported.");
return 0;
}
}
if (!lv_add_mirrors(cmd, lv, lp->mirrors - 1, 1,
adjusted_mirror_region_size(
lv->vg->extent_size,
lv->le_count,
lp->region_size),
corelog ? 0U : 1U, lp->pvh, lp->alloc,
MIRROR_BY_LV))
return_0;
if (lp->wait_completion)
lp->need_polling = 1;
goto commit_changes;
}
/*
* Converting from mirror to mirror with different leg count,
* or different log type.
*/
if (dm_list_size(&lv->segments) != 1) {
log_error("Logical volume %s has multiple "
"mirror segments.", lv->name);
return 0;
}
if (lp->mirrors == existing_mirrors) {
/*
* Convert Mirror log type
*/
original_lv = _original_lv(lv);
if (!first_seg(original_lv)->log_lv && !corelog) {
if (!add_mirror_log(cmd, original_lv, 1,
adjusted_mirror_region_size(
lv->vg->extent_size,
lv->le_count,
lp->region_size),
lp->pvh, lp->alloc))
return_0;
} else if (first_seg(original_lv)->log_lv && corelog) {
if (!remove_mirror_log(cmd, original_lv,
lp->pv_count ? lp->pvh : NULL))
return_0;
} else {
/* No change */
log_error("Logical volume %s already has %"
PRIu32 " mirror(s).", lv->name,
lp->mirrors - 1);
if (lv->status & CONVERTING)
lp->need_polling = 1;
return 1;
}
} else if (lp->mirrors > existing_mirrors) {
if (lv->status & MIRROR_NOTSYNCED) {
log_error("Not adding mirror to mirrored LV "
"without initial resync");
return 0;
}
/*
* Log addition/removal should be done before the layer
* insertion to make the end result consistent with
* linear-to-mirror conversion.
*/
original_lv = _original_lv(lv);
if (!first_seg(original_lv)->log_lv && !corelog) {
if (!add_mirror_log(cmd, original_lv, 1,
adjusted_mirror_region_size(
lv->vg->extent_size,
lv->le_count,
lp->region_size),
lp->pvh, lp->alloc))
return_0;
} else if (first_seg(original_lv)->log_lv && corelog) {
if (!remove_mirror_log(cmd, original_lv,
lp->pv_count ? lp->pvh : NULL))
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, lp->mirrors - existing_mirrors, 1,
adjusted_mirror_region_size(
lv->vg->extent_size,
lv->le_count,
lp->region_size),
0U, lp->pvh, lp->alloc,
MIRROR_BY_LV))
return_0;
lv->status |= CONVERTING;
lp->need_polling = 1;
} else {
/* Reduce number of mirrors */
if (!lv_remove_mirrors(cmd, lv, existing_mirrors - lp->mirrors,
corelog ? 1U : 0U,
lp->pv_count ? lp->pvh : NULL, 0))
return_0;
}
commit_changes:
log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
if (!vg_write(lv->vg))
return_0;
backup(lv->vg);
if (!suspend_lv(cmd, lv)) {
log_error("Failed to lock %s", lv->name);
vg_revert(lv->vg);
return 0;
}
if (!vg_commit(lv->vg)) {
resume_lv(cmd, lv);
return 0;
}
log_very_verbose("Updating \"%s\" in kernel", lv->name);
if (!resume_lv(cmd, lv)) {
log_error("Problem reactivating %s", lv->name);
return 0;
}
if (!lp->need_polling)
log_print("Logical volume %s converted.", lv->name);
return 1;
}
static int lvconvert_snapshot(struct cmd_context *cmd,
struct logical_volume *lv,
struct lvconvert_params *lp)
{
struct logical_volume *org;
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(NULL, 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;
backup(lv->vg);
if (!suspend_lv(cmd, org)) {
log_error("Failed to suspend origin %s", org->name);
vg_revert(lv->vg);
return 0;
}
if (!vg_commit(lv->vg))
return_0;
if (!resume_lv(cmd, org)) {
log_error("Problem reactivating origin %s", org->name);
return 0;
}
log_print("Logical volume %s converted to snapshot.", lv->name);
return 1;
}
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_origin(lv)) {
log_error("Can't convert logical volume \"%s\" under snapshot",
lv->name);
return ECMD_FAILED;
}
if (lv_is_cow(lv)) {
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 (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))
return ECMD_FAILED;
if (!lvconvert_snapshot(cmd, lv, lp))
return ECMD_FAILED;
} else if (arg_count(cmd, mirrors_ARG) || (lv->status & MIRRORED)) {
if (!archive(lv->vg))
return ECMD_FAILED;
if (!lvconvert_mirrors(cmd, lv, lp))
return ECMD_FAILED;
}
return ECMD_PROCESSED;
}
int lvconvert(struct cmd_context * cmd, int argc, char **argv)
{
struct volume_group *vg;
struct lv_list *lvl;
struct lvconvert_params lp;
int ret = ECMD_FAILED;
struct lvinfo info;
if (!_read_params(&lp, cmd, argc, argv)) {
stack;
return EINVALID_CMD_LINE;
}
log_verbose("Checking for existing volume group \"%s\"", lp.vg_name);
if (!(vg = vg_lock_and_read(cmd, lp.vg_name, NULL, LCK_VG_WRITE,
CLUSTERED | EXPORTED_VG | LVM_WRITE,
CORRECT_INCONSISTENT)))
return ECMD_FAILED;
if (!(lvl = find_lv_in_vg(vg, lp.lv_name))) {
log_error("Logical volume \"%s\" not found in "
"volume group \"%s\"", lp.lv_name, lp.vg_name);
goto bad;
}
if (lp.pv_count) {
if (!(lp.pvh = create_pv_list(cmd->mem, vg, lp.pv_count,
lp.pvs, 0)))
goto_bad;
} else
lp.pvh = &vg->pvs;
ret = lvconvert_single(cmd, lvl->lv, &lp);
bad:
unlock_vg(cmd, lp.vg_name);
if (ret == ECMD_PROCESSED && lp.need_polling) {
if (!lv_info(cmd, lvl->lv, &info, 1, 0) || !info.exists) {
log_print("Conversion starts after activation");
goto out;
}
ret = lvconvert_poll(cmd, lp.lv_name_full,
lp.wait_completion ? 0 : 1U);
}
out:
vg_release(vg);
return ret;
}
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