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lvm2/tools/lvresize.c
Petr Rockai a341cab721 Implement automatic snapshot extension with dmeventd, and add two new options 
to lvm.conf in the activation section: 'snapshot_autoextend_threshold' and
'snapshot_autoextend_percent', that define how to handle automatic snapshot
extension. The former defines when the snapshot should be extended: when its
space usage exceeds this many percent. The latter defines how much extra space
should be allocated for the snapshot, in percent of its current size.
2010-10-15 16:28:14 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2009 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"
#define SIZE_BUF 128
struct lvresize_params {
const char *vg_name;
const char *lv_name;
uint32_t stripes;
uint32_t stripe_size;
uint32_t mirrors;
const struct segment_type *segtype;
/* size */
uint32_t extents;
uint64_t size;
sign_t sign;
percent_t percent;
enum {
LV_ANY = 0,
LV_REDUCE = 1,
LV_EXTEND = 2
} resize;
int resizefs;
int nofsck;
int argc;
char **argv;
};
static int _validate_stripesize(struct cmd_context *cmd,
const struct volume_group *vg,
struct lvresize_params *lp)
{
if (arg_sign_value(cmd, stripesize_ARG, 0) == SIGN_MINUS) {
log_error("Stripesize may not be negative.");
return 0;
}
if (arg_uint_value(cmd, stripesize_ARG, 0) > STRIPE_SIZE_LIMIT * 2) {
log_error("Stripe size cannot be larger than %s",
display_size(cmd, (uint64_t) STRIPE_SIZE_LIMIT));
return 0;
}
if (!(vg->fid->fmt->features & FMT_SEGMENTS))
log_warn("Varied stripesize not supported. Ignoring.");
else if (arg_uint_value(cmd, stripesize_ARG, 0) > vg->extent_size * 2) {
log_error("Reducing stripe size %s to maximum, "
"physical extent size %s",
display_size(cmd,
(uint64_t) arg_uint_value(cmd, stripesize_ARG, 0)),
display_size(cmd, (uint64_t) vg->extent_size));
lp->stripe_size = vg->extent_size;
} else
lp->stripe_size = arg_uint_value(cmd, stripesize_ARG, 0);
if (lp->stripe_size & (lp->stripe_size - 1)) {
log_error("Stripe size must be power of 2");
return 0;
}
return 1;
}
static int _request_confirmation(struct cmd_context *cmd,
const struct volume_group *vg,
const struct logical_volume *lv,
const struct lvresize_params *lp)
{
struct lvinfo info;
memset(&info, 0, sizeof(info));
if (!lv_info(cmd, lv, 0, &info, 1, 0) && driver_version(NULL, 0)) {
log_error("lv_info failed: aborting");
return 0;
}
if (lp->resizefs) {
if (!info.exists) {
log_error("Logical volume %s must be activated "
"before resizing filesystem", lp->lv_name);
return 0;
}
return 1;
}
if (!info.exists)
return 1;
log_warn("WARNING: Reducing active%s logical volume to %s",
info.open_count ? " and open" : "",
display_size(cmd, (uint64_t) lp->extents * vg->extent_size));
log_warn("THIS MAY DESTROY YOUR DATA (filesystem etc.)");
if (!arg_count(cmd, force_ARG)) {
if (yes_no_prompt("Do you really want to reduce %s? [y/n]: ",
lp->lv_name) == 'n') {
log_error("Logical volume %s NOT reduced", lp->lv_name);
return 0;
}
if (sigint_caught())
return 0;
}
return 1;
}
enum fsadm_cmd_e { FSADM_CMD_CHECK, FSADM_CMD_RESIZE };
#define FSADM_CMD "fsadm"
#define FSADM_CMD_MAX_ARGS 6
/*
* FSADM_CMD --dry-run --verbose --force check lv_path
* FSADM_CMD --dry-run --verbose --force resize lv_path size
*/
static int _fsadm_cmd(struct cmd_context *cmd,
const struct volume_group *vg,
const struct lvresize_params *lp,
enum fsadm_cmd_e fcmd)
{
char lv_path[PATH_MAX];
char size_buf[SIZE_BUF];
const char *argv[FSADM_CMD_MAX_ARGS + 2];
unsigned i = 0;
argv[i++] = FSADM_CMD;
if (test_mode())
argv[i++] = "--dry-run";
if (verbose_level() >= _LOG_NOTICE)
argv[i++] = "--verbose";
if (arg_count(cmd, force_ARG))
argv[i++] = "--force";
argv[i++] = (fcmd == FSADM_CMD_RESIZE) ? "resize" : "check";
if (dm_snprintf(lv_path, PATH_MAX, "%s%s/%s", cmd->dev_dir, lp->vg_name,
lp->lv_name) < 0) {
log_error("Couldn't create LV path for %s", lp->lv_name);
return 0;
}
argv[i++] = lv_path;
if (fcmd == FSADM_CMD_RESIZE) {
if (dm_snprintf(size_buf, SIZE_BUF, "%" PRIu64 "K",
(uint64_t) lp->extents * vg->extent_size / 2) < 0) {
log_error("Couldn't generate new LV size string");
return 0;
}
argv[i++] = size_buf;
}
argv[i] = NULL;
return exec_cmd(cmd, argv);
}
static int _lvresize_params(struct cmd_context *cmd, int argc, char **argv,
struct lvresize_params *lp)
{
const char *cmd_name;
char *st;
unsigned dev_dir_found = 0;
int use_policy = arg_count(cmd, use_policies_ARG);
lp->sign = SIGN_NONE;
lp->resize = LV_ANY;
cmd_name = command_name(cmd);
if (!strcmp(cmd_name, "lvreduce"))
lp->resize = LV_REDUCE;
if (!strcmp(cmd_name, "lvextend"))
lp->resize = LV_EXTEND;
if (use_policy) {
/* do nothing; _lvresize will handle --use-policies itself */
lp->extents = 0;
lp->sign = SIGN_PLUS;
lp->percent = PERCENT_LV;
} else {
/*
* Allow omission of extents and size if the user has given us
* one or more PVs. Most likely, the intent was "resize this
* LV the best you can with these PVs"
*/
if ((arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) == 0) &&
(argc >= 2)) {
lp->extents = 100;
lp->percent = PERCENT_PVS;
lp->sign = SIGN_PLUS;
} else if ((arg_count(cmd, extents_ARG) +
arg_count(cmd, size_ARG) != 1)) {
log_error("Please specify either size or extents but not "
"both.");
return 0;
}
if (arg_count(cmd, extents_ARG)) {
lp->extents = arg_uint_value(cmd, extents_ARG, 0);
lp->sign = arg_sign_value(cmd, extents_ARG, SIGN_NONE);
lp->percent = arg_percent_value(cmd, extents_ARG, PERCENT_NONE);
}
/* Size returned in kilobyte units; held in sectors */
if (arg_count(cmd, size_ARG)) {
lp->size = arg_uint64_value(cmd, size_ARG, 0);
lp->sign = arg_sign_value(cmd, size_ARG, SIGN_NONE);
lp->percent = PERCENT_NONE;
}
}
if (lp->resize == LV_EXTEND && lp->sign == SIGN_MINUS) {
log_error("Negative argument not permitted - use lvreduce");
return 0;
}
if (lp->resize == LV_REDUCE && lp->sign == SIGN_PLUS) {
log_error("Positive sign not permitted - use lvextend");
return 0;
}
lp->resizefs = arg_is_set(cmd, resizefs_ARG);
lp->nofsck = arg_is_set(cmd, nofsck_ARG);
if (!argc) {
log_error("Please provide the logical volume name");
return 0;
}
lp->lv_name = argv[0];
argv++;
argc--;
if (!(lp->lv_name = skip_dev_dir(cmd, lp->lv_name, &dev_dir_found)) ||
!(lp->vg_name = extract_vgname(cmd, lp->lv_name))) {
log_error("Please provide a volume group name");
return 0;
}
if (!validate_name(lp->vg_name)) {
log_error("Volume group name %s has invalid characters",
lp->vg_name);
return 0;
}
if ((st = strrchr(lp->lv_name, '/')))
lp->lv_name = st + 1;
lp->argc = argc;
lp->argv = argv;
return 1;
}
static int _adjust_policy_params(struct cmd_context *cmd,
struct logical_volume *lv, struct lvresize_params *lp)
{
float percent;
percent_range_t range;
int policy_threshold, policy_amount;
policy_threshold =
find_config_tree_int(cmd, "activation/snapshot_autoextend_threshold",
DEFAULT_SNAPSHOT_AUTOEXTEND_THRESHOLD);
policy_amount =
find_config_tree_int(cmd, "activation/snapshot_autoextend_percent",
DEFAULT_SNAPSHOT_AUTOEXTEND_PERCENT);
if (policy_threshold >= 100)
return 1; /* nothing to do */
if (!lv_snapshot_percent(lv, &percent, &range))
return_0;
if (range != PERCENT_0_TO_100 || percent <= policy_threshold)
return 1; /* nothing to do */
lp->extents = policy_amount;
return 1;
}
static int _lvresize(struct cmd_context *cmd, struct volume_group *vg,
struct lvresize_params *lp)
{
struct logical_volume *lv;
struct lvinfo info;
uint32_t stripesize_extents = 0;
uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
uint32_t seg_mirrors = 0;
uint32_t extents_used = 0;
uint32_t size_rest;
uint32_t pv_extent_count = 0;
alloc_policy_t alloc;
struct logical_volume *lock_lv;
struct lv_list *lvl;
struct lv_segment *seg, *uninitialized_var(mirr_seg);
uint32_t seg_extents;
uint32_t sz, str;
struct dm_list *pvh = NULL;
int use_policy = arg_count(cmd, use_policies_ARG);
/* does LV exist? */
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);
return ECMD_FAILED;
}
if (arg_count(cmd, stripes_ARG)) {
if (vg->fid->fmt->features & FMT_SEGMENTS)
lp->stripes = arg_uint_value(cmd, stripes_ARG, 1);
else
log_warn("Varied striping not supported. Ignoring.");
}
if (arg_count(cmd, mirrors_ARG)) {
if (vg->fid->fmt->features & FMT_SEGMENTS)
lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 1) + 1;
else
log_warn("Mirrors not supported. Ignoring.");
if (arg_sign_value(cmd, mirrors_ARG, 0) == SIGN_MINUS) {
log_error("Mirrors argument may not be negative");
return EINVALID_CMD_LINE;
}
}
if (arg_count(cmd, stripesize_ARG) &&
!_validate_stripesize(cmd, vg, lp))
return EINVALID_CMD_LINE;
lv = lvl->lv;
if (use_policy) {
if (!lv_is_cow(lv)) {
log_error("Can't use policy-based resize for non-snapshot volumes.");
return ECMD_FAILED;
}
_adjust_policy_params(cmd, lv, lp);
}
if (!lv_is_visible(lv)) {
log_error("Can't resize internal logical volume %s", lv->name);
return ECMD_FAILED;
}
if (lv->status & LOCKED) {
log_error("Can't resize locked LV %s", lv->name);
return ECMD_FAILED;
}
if (lv->status & CONVERTING) {
log_error("Can't resize %s while lvconvert in progress", lv->name);
return ECMD_FAILED;
}
alloc = arg_uint_value(cmd, alloc_ARG, lv->alloc);
if (lp->size) {
if (lp->size % vg->extent_size) {
if (lp->sign == SIGN_MINUS)
lp->size -= lp->size % vg->extent_size;
else
lp->size += vg->extent_size -
(lp->size % vg->extent_size);
log_print("Rounding up size to full physical extent %s",
display_size(cmd, (uint64_t) lp->size));
}
lp->extents = lp->size / vg->extent_size;
}
if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc,
lp->argv, 1) : &vg->pvs)) {
stack;
return ECMD_FAILED;
}
switch(lp->percent) {
case PERCENT_VG:
lp->extents = lp->extents * vg->extent_count / 100;
break;
case PERCENT_FREE:
lp->extents = lp->extents * vg->free_count / 100;
break;
case PERCENT_LV:
lp->extents = lp->extents * lv->le_count / 100;
break;
case PERCENT_PVS:
if (lp->argc) {
pv_extent_count = pv_list_extents_free(pvh);
lp->extents = lp->extents * pv_extent_count / 100;
} else
lp->extents = lp->extents * vg->extent_count / 100;
break;
case PERCENT_ORIGIN:
if (!lv_is_cow(lv)) {
log_error("Specified LV does not have an origin LV.");
return EINVALID_CMD_LINE;
}
lp->extents = lp->extents * origin_from_cow(lv)->le_count / 100;
break;
case PERCENT_NONE:
break;
}
if (lp->sign == SIGN_PLUS)
lp->extents += lv->le_count;
if (lp->sign == SIGN_MINUS) {
if (lp->extents >= lv->le_count) {
log_error("Unable to reduce %s below 1 extent",
lp->lv_name);
return EINVALID_CMD_LINE;
}
lp->extents = lv->le_count - lp->extents;
}
if (!lp->extents) {
log_error("New size of 0 not permitted");
return EINVALID_CMD_LINE;
}
if (lp->extents == lv->le_count) {
if (use_policy)
return ECMD_PROCESSED; /* Nothing to do. */
if (!lp->resizefs) {
log_error("New size (%d extents) matches existing size "
"(%d extents)", lp->extents, lv->le_count);
return EINVALID_CMD_LINE;
}
lp->resize = LV_EXTEND; /* lets pretend zero size extension */
}
seg_size = lp->extents - lv->le_count;
/* Use segment type of last segment */
dm_list_iterate_items(seg, &lv->segments) {
lp->segtype = seg->segtype;
}
/* FIXME Support LVs with mixed segment types */
if (lp->segtype != get_segtype_from_string(cmd, arg_str_value(cmd, type_ARG,
lp->segtype->name))) {
log_error("VolumeType does not match (%s)", lp->segtype->name);
return EINVALID_CMD_LINE;
}
/* If extending, find mirrors of last segment */
if ((lp->extents > lv->le_count)) {
dm_list_iterate_back_items(mirr_seg, &lv->segments) {
if (seg_is_mirrored(mirr_seg))
seg_mirrors = lv_mirror_count(mirr_seg->lv);
else
seg_mirrors = 0;
break;
}
if (!arg_count(cmd, mirrors_ARG) && seg_mirrors) {
log_print("Extending %" PRIu32 " mirror images.",
seg_mirrors);
lp->mirrors = seg_mirrors;
}
if ((arg_count(cmd, mirrors_ARG) || seg_mirrors) &&
(lp->mirrors != seg_mirrors)) {
log_error("Cannot vary number of mirrors in LV yet.");
return EINVALID_CMD_LINE;
}
}
/* If extending, find stripes, stripesize & size of last segment */
if ((lp->extents > lv->le_count) &&
!(lp->stripes == 1 || (lp->stripes > 1 && lp->stripe_size))) {
/* FIXME Don't assume mirror seg will always be AREA_LV */
dm_list_iterate_items(seg, seg_mirrors ? &seg_lv(mirr_seg, 0)->segments : &lv->segments) {
if (!seg_is_striped(seg))
continue;
sz = seg->stripe_size;
str = seg->area_count;
if ((seg_stripesize && seg_stripesize != sz &&
sz && !lp->stripe_size) ||
(seg_stripes && seg_stripes != str && !lp->stripes)) {
log_error("Please specify number of "
"stripes (-i) and stripesize (-I)");
return EINVALID_CMD_LINE;
}
seg_stripesize = sz;
seg_stripes = str;
}
if (!lp->stripes)
lp->stripes = seg_stripes;
if (!lp->stripe_size && lp->stripes > 1) {
if (seg_stripesize) {
log_print("Using stripesize of last segment %s",
display_size(cmd, (uint64_t) seg_stripesize));
lp->stripe_size = seg_stripesize;
} else {
lp->stripe_size =
find_config_tree_int(cmd,
"metadata/stripesize",
DEFAULT_STRIPESIZE) * 2;
log_print("Using default stripesize %s",
display_size(cmd, (uint64_t) lp->stripe_size));
}
}
}
/* If reducing, find stripes, stripesize & size of last segment */
if (lp->extents < lv->le_count) {
extents_used = 0;
if (lp->stripes || lp->stripe_size || lp->mirrors)
log_error("Ignoring stripes, stripesize and mirrors "
"arguments when reducing");
dm_list_iterate_items(seg, &lv->segments) {
seg_extents = seg->len;
if (seg_is_striped(seg)) {
seg_stripesize = seg->stripe_size;
seg_stripes = seg->area_count;
}
if (seg_is_mirrored(seg))
seg_mirrors = lv_mirror_count(seg->lv);
else
seg_mirrors = 0;
if (lp->extents <= extents_used + seg_extents)
break;
extents_used += seg_extents;
}
seg_size = lp->extents - extents_used;
lp->stripe_size = seg_stripesize;
lp->stripes = seg_stripes;
lp->mirrors = seg_mirrors;
}
if (lp->stripes > 1 && !lp->stripe_size) {
log_error("Stripesize for striped segment should not be 0!");
return EINVALID_CMD_LINE;
}
if ((lp->stripes > 1)) {
if (!(stripesize_extents = lp->stripe_size / vg->extent_size))
stripesize_extents = 1;
if ((size_rest = seg_size % (lp->stripes * stripesize_extents))) {
log_print("Rounding size (%d extents) down to stripe "
"boundary size for segment (%d extents)",
lp->extents, lp->extents - size_rest);
lp->extents = lp->extents - size_rest;
}
if (lp->stripe_size < STRIPE_SIZE_MIN) {
log_error("Invalid stripe size %s",
display_size(cmd, (uint64_t) lp->stripe_size));
return EINVALID_CMD_LINE;
}
}
if (lp->extents < lv->le_count) {
if (lp->resize == LV_EXTEND) {
log_error("New size given (%d extents) not larger "
"than existing size (%d extents)",
lp->extents, lv->le_count);
return EINVALID_CMD_LINE;
}
lp->resize = LV_REDUCE;
} else if (lp->extents > lv->le_count) {
if (lp->resize == LV_REDUCE) {
log_error("New size given (%d extents) not less than "
"existing size (%d extents)", lp->extents,
lv->le_count);
return EINVALID_CMD_LINE;
}
lp->resize = LV_EXTEND;
}
if (lv_is_origin(lv)) {
if (lp->resize == LV_REDUCE) {
log_error("Snapshot origin volumes cannot be reduced "
"in size yet.");
return ECMD_FAILED;
}
memset(&info, 0, sizeof(info));
if (lv_info(cmd, lv, 0, &info, 0, 0) && info.exists) {
log_error("Snapshot origin volumes can be resized "
"only while inactive: try lvchange -an");
return ECMD_FAILED;
}
}
if ((lp->resize == LV_REDUCE) && lp->argc)
log_warn("Ignoring PVs on command line when reducing");
/* Request confirmation before operations that are often mistakes. */
if ((lp->resizefs || (lp->resize == LV_REDUCE)) &&
!_request_confirmation(cmd, vg, lv, lp)) {
stack;
return ECMD_FAILED;
}
if (lp->resizefs) {
if (!lp->nofsck &&
!_fsadm_cmd(cmd, vg, lp, FSADM_CMD_CHECK)) {
stack;
return ECMD_FAILED;
}
if ((lp->resize == LV_REDUCE) &&
!_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE)) {
stack;
return ECMD_FAILED;
}
}
if (!archive(vg)) {
stack;
return ECMD_FAILED;
}
log_print("%sing logical volume %s to %s",
(lp->resize == LV_REDUCE) ? "Reduc" : "Extend",
lp->lv_name,
display_size(cmd, (uint64_t) lp->extents * vg->extent_size));
if (lp->resize == LV_REDUCE) {
if (!lv_reduce(lv, lv->le_count - lp->extents)) {
stack;
return ECMD_FAILED;
}
} else if ((lp->extents > lv->le_count) && /* Ensure we extend */
!lv_extend(lv, lp->segtype, lp->stripes,
lp->stripe_size, lp->mirrors,
lp->extents - lv->le_count,
NULL, 0u, 0u, pvh, alloc)) {
stack;
return ECMD_FAILED;
}
/* store vg on disk(s) */
if (!vg_write(vg)) {
stack;
return ECMD_FAILED;
}
/* If snapshot, must suspend all associated devices */
if (lv_is_cow(lv))
lock_lv = origin_from_cow(lv);
else
lock_lv = lv;
if (!suspend_lv(cmd, lock_lv)) {
log_error("Failed to suspend %s", lp->lv_name);
vg_revert(vg);
backup(vg);
return ECMD_FAILED;
}
if (!vg_commit(vg)) {
stack;
if (!resume_lv(cmd, lock_lv))
stack;
backup(vg);
return ECMD_FAILED;
}
if (!resume_lv(cmd, lock_lv)) {
log_error("Problem reactivating %s", lp->lv_name);
backup(vg);
return ECMD_FAILED;
}
backup(vg);
log_print("Logical volume %s successfully resized", lp->lv_name);
if (lp->resizefs && (lp->resize == LV_EXTEND) &&
!_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE)) {
stack;
return ECMD_FAILED;
}
return ECMD_PROCESSED;
}
int lvresize(struct cmd_context *cmd, int argc, char **argv)
{
struct lvresize_params lp;
struct volume_group *vg;
int r;
memset(&lp, 0, sizeof(lp));
if (!_lvresize_params(cmd, argc, argv, &lp))
return EINVALID_CMD_LINE;
log_verbose("Finding volume group %s", lp.vg_name);
vg = vg_read_for_update(cmd, lp.vg_name, NULL, 0);
if (vg_read_error(vg)) {
vg_release(vg);
stack;
return ECMD_FAILED;
}
if (!(r = _lvresize(cmd, vg, &lp)))
stack;
unlock_and_release_vg(cmd, vg, lp.vg_name);
return r;
}
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