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lvm2/tools/lvresize.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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* This file is part of LVM2.
*
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* 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
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* 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;
struct segment_type *segtype;
/* size */
uint32_t extents;
uint64_t size;
sign_t sign;
enum {
LV_ANY = 0,
LV_REDUCE = 1,
LV_EXTEND = 2
} resize;
int resizefs;
int nofsck;
int argc;
char **argv;
};
static int _read_params(struct cmd_context *cmd, int argc, char **argv,
struct lvresize_params *lp)
{
const char *cmd_name;
char *st;
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 (arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) != 1) {
log_error("Please specify either size or extents (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);
}
/* Size returned in kilobyte units; held in sectors */
if (arg_count(cmd, size_ARG)) {
lp->size = arg_uint64_value(cmd, size_ARG, UINT64_C(0)) * 2;
lp->sign = arg_sign_value(cmd, size_ARG, SIGN_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_count(cmd, resizefs_ARG) ? 1 : 0;
lp->nofsck = arg_count(cmd, nofsck_ARG) ? 1 : 0;
if (!argc) {
log_error("Please provide the logical volume name");
return 0;
}
lp->lv_name = argv[0];
argv++;
argc--;
if (!(lp->vg_name = extract_vgname(cmd, lp->lv_name))) {
log_error("Please provide a volume group name");
return 0;
}
if ((st = strrchr(lp->lv_name, '/')))
lp->lv_name = st + 1;
lp->argc = argc;
lp->argv = argv;
return 1;
}
static int _lvresize(struct cmd_context *cmd, struct lvresize_params *lp)
{
struct volume_group *vg;
struct logical_volume *lv;
struct snapshot *snap;
struct lvinfo info;
uint32_t stripesize_extents = 0;
uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
uint32_t extents_used = 0;
uint32_t size_rest;
alloc_policy_t alloc;
char *lock_lvid;
struct lv_list *lvl;
int consistent = 1;
struct lv_segment *seg;
uint32_t seg_extents;
uint32_t sz, str;
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struct list *pvh = NULL;
char size_buf[SIZE_BUF];
char lv_path[PATH_MAX];
if (!(vg = vg_read(cmd, lp->vg_name, &consistent))) {
log_error("Volume group %s doesn't exist", lp->vg_name);
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return ECMD_FAILED;
}
if (vg->status & EXPORTED_VG) {
log_error("Volume group %s is exported", vg->name);
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return ECMD_FAILED;
}
if (!(vg->status & LVM_WRITE)) {
log_error("Volume group %s is read-only", lp->vg_name);
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return ECMD_FAILED;
}
/* 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);
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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_print("Varied striping not supported. Ignoring.");
}
if (arg_count(cmd, stripesize_ARG)) {
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if (arg_sign_value(cmd, stripesize_ARG, 0) == SIGN_MINUS) {
log_error("Stripesize may not be negative.");
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return ECMD_FAILED;
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}
if (vg->fid->fmt->features & FMT_SEGMENTS)
lp->stripe_size = 2 * arg_uint_value(cmd,
stripesize_ARG, 0);
else
log_print("Varied stripesize not supported. Ignoring.");
}
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lv = lvl->lv;
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if (lv->status & LOCKED) {
log_error("Can't resize locked LV %s", lv->name);
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return ECMD_FAILED;
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}
alloc = (alloc_policy_t) arg_uint_value(cmd, alloc_ARG, lv->alloc);
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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",
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display_size(cmd, (uint64_t) lp->size,
SIZE_SHORT));
}
lp->extents = lp->size / vg->extent_size;
}
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);
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return EINVALID_CMD_LINE;
}
lp->extents = lv->le_count - lp->extents;
}
if (!lp->extents) {
log_error("New size of 0 not permitted");
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return EINVALID_CMD_LINE;
}
if (lp->extents == lv->le_count) {
log_error("New size (%d extents) matches existing size "
"(%d extents)", lp->extents, lv->le_count);
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return EINVALID_CMD_LINE;
}
seg_size = lp->extents - lv->le_count;
/* Use segment type of last segment */
list_iterate_items(seg, &lv->segments) {
lp->segtype = seg->segtype;
}
/* FIXME Support LVs with mixed segment types */
if (lp->segtype != (struct segment_type *) arg_ptr_value(cmd, type_ARG,
lp->segtype)) {
log_error("VolumeType does not match (%s)", lp->segtype->name);
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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))) {
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list_iterate_items(seg, &lv->segments) {
if (!(seg->segtype->flags & SEG_AREAS_STRIPED))
continue;
sz = seg->stripe_size;
str = seg->area_count;
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if ((seg_stripesize && seg_stripesize != sz
&& !lp->stripe_size) ||
(seg_stripes && seg_stripes != str && !lp->stripes)) {
log_error("Please specify number of "
"stripes (-i) and stripesize (-I)");
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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 "
"%dKB", seg_stripesize / 2);
lp->stripe_size = seg_stripesize;
} else {
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lp->stripe_size =
find_config_int(cmd->cft->root,
"metadata/stripesize",
DEFAULT_STRIPESIZE) * 2;
log_print("Using default stripesize %dKB",
lp->stripe_size / 2);
}
}
}
/* If reducing, find stripes, stripesize & size of last segment */
if (lp->extents < lv->le_count) {
extents_used = 0;
if (lp->stripes || lp->stripe_size)
log_error("Ignoring stripes and stripesize arguments "
"when reducing");
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list_iterate_items(seg, &lv->segments) {
seg_extents = seg->len;
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if (seg->segtype->flags & SEG_AREAS_STRIPED) {
seg_stripesize = seg->stripe_size;
seg_stripes = seg->area_count;
}
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;
}
if (lp->stripes > 1 && !lp->stripe_size) {
log_error("Stripesize for striped segment should not be 0!");
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return EINVALID_CMD_LINE;
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}
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if ((lp->stripes > 1)) {
if (!(stripesize_extents = lp->stripe_size / vg->extent_size))
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stripesize_extents = 1;
if ((size_rest = seg_size % (lp->stripes * stripesize_extents))) {
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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;
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}
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}
if (lp->extents == lv->le_count) {
log_error("New size (%d extents) matches existing size "
"(%d extents)", lp->extents, lv->le_count);
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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);
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return EINVALID_CMD_LINE;
} else
lp->resize = LV_REDUCE;
}
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);
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return EINVALID_CMD_LINE;
} else
lp->resize = LV_EXTEND;
}
if (lp->resize == LV_REDUCE) {
if (lp->argc)
log_print("Ignoring PVs on command line when reducing");
} else if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc,
lp->argv, 1) : &vg->pvs)) {
stack;
return ECMD_FAILED;
}
if (lp->resize == LV_REDUCE || lp->resizefs) {
memset(&info, 0, sizeof(info));
if (!lv_info(lv, &info) && driver_version(NULL, 0)) {
log_error("lv_info failed: aborting");
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return ECMD_FAILED;
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}
if (lp->resizefs && !info.exists) {
log_error("Logical volume %s must be activated "
"before resizing filesystem", lp->lv_name);
return ECMD_FAILED;
}
if (info.exists && !lp->resizefs && (lp->resize == LV_REDUCE)) {
log_print("WARNING: Reducing active%s logical volume "
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"to %s", info.open_count ? " and open" : "",
display_size(cmd, (uint64_t) lp->extents *
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vg->extent_size,
SIZE_SHORT));
log_print("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_print("Logical volume %s NOT "
"reduced", lp->lv_name);
return ECMD_FAILED;
}
}
}
}
if (lp->resizefs) {
if (lvm_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);
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return ECMD_FAILED;
}
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if (lvm_snprintf(size_buf, SIZE_BUF, "%" PRIu64,
(uint64_t) lp->extents * vg->extent_size / 2)
< 0) {
log_error("Couldn't generate new LV size string");
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return ECMD_FAILED;
}
if (!lp->nofsck) {
if (!exec_cmd("fsadm", "check", lv_path, NULL)) {
stack;
return ECMD_FAILED;
}
}
if (lp->resize == LV_REDUCE) {
if (!exec_cmd("fsadm", "resize", lv_path, size_buf)) {
stack;
return ECMD_FAILED;
}
}
}
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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,
SIZE_SHORT));
if (lp->resize == LV_REDUCE) {
if (!lv_reduce(vg->fid, lv, lv->le_count - lp->extents)) {
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stack;
return ECMD_FAILED;
}
} else if (!lv_extend(vg->fid, lv, lp->segtype, lp->stripes,
lp->stripe_size, 0u,
lp->extents - lv->le_count,
NULL, 0u, 0u, pvh, alloc)) {
stack;
return ECMD_FAILED;
}
/* store vg on disk(s) */
if (!vg_write(vg)) {
stack;
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return ECMD_FAILED;
}
backup(vg);
/* If snapshot, must suspend all associated devices */
if ((snap = find_cow(lv)))
lock_lvid = snap->origin->lvid.s;
else
lock_lvid = lv->lvid.s;
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if (!suspend_lv(cmd, lock_lvid)) {
log_error("Failed to suspend %s", lp->lv_name);
vg_revert(vg);
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return ECMD_FAILED;
}
if (!vg_commit(vg)) {
stack;
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resume_lv(cmd, lock_lvid);
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return ECMD_FAILED;
}
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if (!resume_lv(cmd, lock_lvid)) {
log_error("Problem reactivating %s", lp->lv_name);
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return ECMD_FAILED;
}
log_print("Logical volume %s successfully resized", lp->lv_name);
if (lp->resizefs && (lp->resize == LV_EXTEND)) {
if (!exec_cmd("fsadm", "resize", lv_path, size_buf)) {
stack;
return ECMD_FAILED;
}
}
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return ECMD_PROCESSED;
}
int lvresize(struct cmd_context *cmd, int argc, char **argv)
{
struct lvresize_params lp;
int r;
memset(&lp, 0, sizeof(lp));
if (!_read_params(cmd, argc, argv, &lp))
return EINVALID_CMD_LINE;
log_verbose("Finding volume group %s", lp.vg_name);
if (!lock_vol(cmd, lp.vg_name, LCK_VG_WRITE)) {
log_error("Can't get lock for %s", lp.vg_name);
return ECMD_FAILED;
}
if (!(r = _lvresize(cmd, &lp)))
stack;
unlock_vg(cmd, lp.vg_name);
return r;
}