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lvm2/tools/lvresize.c
Alasdair Kergon 25b733809a Merge with text format branch. 
Lots of changes/very little testing so far => there'll be bugs!

Use 'vgcreate -M text' to create a volume group with its metadata stored
in text files.  Text format metadata changes should be reasonably atomic,
with a (basic) automatic recovery mechanism if the system crashes while a
change is in progress.

Add a metadata section to lvm.conf to specify multiple directories if
you want (recommended) to keep multiple copies of the metadata (eg on
different filesystems).

e.g. metadata {
        dirs = ["/etc/lvm/metadata1","/usr/local/lvm/metadata2"]
}

Plenty of refinements still in the pipeline.
2002-04-24 18:20:51 +00:00

391 lines
9.2 KiB
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/*
* Copyright (C) 2001 Sistina Software
*
* LVM is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LVM is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with LVM; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include "tools.h"
int lvresize(struct cmd_context *cmd, int argc, char **argv)
{
struct volume_group *vg;
struct logical_volume *lv;
struct dm_info info;
uint32_t extents = 0;
uint32_t size = 0;
uint32_t stripes = 0, stripesize = 0;
uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
uint32_t extents_used = 0;
uint32_t size_rest;
sign_t sign = SIGN_NONE;
char *lv_name, *vg_name;
char *st;
char *dummy;
const char *cmd_name;
struct list *pvh, *segh;
struct lv_list *lvl;
int opt = 0;
enum {
LV_ANY = 0,
LV_REDUCE = 1,
LV_EXTEND = 2
} resize = LV_ANY;
cmd_name = command_name(cmd);
if (!strcmp(cmd_name, "lvreduce"))
resize = LV_REDUCE;
if (!strcmp(cmd_name, "lvextend"))
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 EINVALID_CMD_LINE;
}
if (arg_count(cmd, extents_ARG)) {
extents = arg_int_value(cmd, extents_ARG, 0);
sign = arg_sign_value(cmd, extents_ARG, SIGN_NONE);
}
if (arg_count(cmd, size_ARG)) {
size = arg_int_value(cmd, size_ARG, 0);
sign = arg_sign_value(cmd, size_ARG, SIGN_NONE);
}
if (resize == LV_EXTEND && sign == SIGN_MINUS) {
log_error("Negative argument not permitted - use lvreduce");
return EINVALID_CMD_LINE;
}
if (resize == LV_REDUCE && sign == SIGN_PLUS) {
log_error("Positive sign not permitted - use lvextend");
return EINVALID_CMD_LINE;
}
if (!argc) {
log_error("Please provide the logical volume name");
return EINVALID_CMD_LINE;
}
lv_name = argv[0];
argv++;
argc--;
if (!(vg_name = extract_vgname(cmd, lv_name))) {
log_error("Please provide a volume group name");
return EINVALID_CMD_LINE;
}
if ((st = strrchr(lv_name, '/')))
lv_name = st + 1;
/* does VG exist? */
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))) {
log_error("Volume group %s doesn't exist", vg_name);
goto error;
}
if (vg->status & EXPORTED_VG) {
log_error("Volume group %s is exported", vg->name);
goto error;
}
if (!(vg->status & LVM_WRITE)) {
log_error("Volume group %s is read-only", vg_name);
goto error;
}
/* does LV exist? */
if (!(lvl = find_lv_in_vg(vg, lv_name))) {
log_error("Logical volume %s not found in volume group %s",
lv_name, vg_name);
goto error;
}
if (arg_count(cmd, stripes_ARG)) {
if (vg->fid->fmt->features & FMT_SEGMENTS)
stripes = arg_int_value(cmd, stripes_ARG, 1);
else
log_print("Varied striping not supported. Ignoring.");
}
if (arg_count(cmd, stripesize_ARG)) {
if (vg->fid->fmt->features & FMT_SEGMENTS)
stripesize = 2 * arg_int_value(cmd, stripesize_ARG, 0);
else
log_print("Varied stripesize not supported. Ignoring.");
}
lv = lvl->lv;
if (size) {
/* No of 512-byte sectors */
extents = size * 2;
if (extents % vg->extent_size) {
char *s1;
if (sign == SIGN_MINUS)
extents -= extents % vg->extent_size;
else
extents += vg->extent_size -
(extents % vg->extent_size);
log_print("Rounding up size to full physical extent %s",
(s1 = display_size(extents / 2, SIZE_SHORT)));
dbg_free(s1);
}
extents /= vg->extent_size;
}
if (sign == SIGN_PLUS)
extents += lv->le_count;
if (sign == SIGN_MINUS) {
if (extents >= lv->le_count) {
log_error("Unable to reduce %s below 1 extent",
lv_name);
goto error_cmdline;
}
extents = lv->le_count - extents;
}
if (!extents) {
log_error("New size of 0 not permitted");
goto error_cmdline;
}
if (extents == lv->le_count) {
log_error("New size (%d extents) matches existing size "
"(%d extents)", extents, lv->le_count);
goto error_cmdline;
}
seg_size = extents - lv->le_count;
/* If extending, find stripes, stripesize & size of last segment */
if (extents > lv->le_count &&
!(stripes == 1 || (stripes > 1 && stripesize))) {
list_iterate(segh, &lv->segments) {
struct stripe_segment *seg;
uint32_t sz, str;
seg = list_item(segh, struct stripe_segment);
sz = seg->stripe_size;
str = seg->stripes;
if ((seg_stripesize && seg_stripesize != sz
&& !stripesize) ||
(seg_stripes && seg_stripes != str && !stripes)) {
log_error("Please specify number of "
"stripes (-i) and stripesize (-I)");
goto error_cmdline;
}
seg_stripesize = sz;
seg_stripes = str;
}
if (!stripes)
stripes = seg_stripes;
if (!stripesize && stripes > 1) {
if (seg_stripesize) {
log_print("Using stripesize of last segment "
"%dKB", seg_stripesize / 2);
stripesize = seg_stripesize;
} else {
log_print("Using default stripesize %dKB",
STRIPE_SIZE_DEFAULT);
stripesize = 2 * STRIPE_SIZE_DEFAULT;
}
}
}
/* If reducing, find stripes, stripesize & size of last segment */
if (extents < lv->le_count) {
extents_used = 0;
if (stripes || stripesize)
log_error("Ignoring stripes and stripesize arguments "
"when reducing");
list_iterate(segh, &lv->segments) {
struct stripe_segment *seg;
uint32_t seg_extents;
seg = list_item(segh, struct stripe_segment);
seg_extents = seg->len;
seg_stripesize = seg->stripe_size;
seg_stripes = seg->stripes;
if (extents <= extents_used + seg_extents)
break;
extents_used += seg_extents;
}
seg_size = extents - extents_used;
stripesize = seg_stripesize;
stripes = seg_stripes;
}
if (stripes > 1 && !stripesize) {
log_error("Stripesize for striped segment should not be 0!");
} else if ((stripes > 1) &&
(size_rest = seg_size % (stripes * stripesize))) {
log_print("Rounding size (%d extents) down to stripe boundary "
"size for segment (%d extents)", extents,
extents - size_rest);
extents = extents - size_rest;
}
if (extents == lv->le_count) {
log_error("New size (%d extents) matches existing size "
"(%d extents)", extents, lv->le_count);
goto error_cmdline;
}
if (extents < lv->le_count) {
if (resize == LV_EXTEND) {
log_error("New size given (%d extents) not larger "
"than existing size (%d extents)",
extents, lv->le_count);
goto error_cmdline;
} else
resize = LV_REDUCE;
}
if (extents > lv->le_count) {
if (resize == LV_REDUCE) {
log_error("New size given (%d extents) not less than "
"existing size (%d extents)", extents,
lv->le_count);
goto error_cmdline;
} else
resize = LV_EXTEND;
}
if (resize == LV_REDUCE) {
if (argc)
log_print("Ignoring PVs on command line when reducing");
memset(&info, 0, sizeof(info));
if (!lv_info(lv, &info) && driver_version(NULL, 0)) {
log_error("lv_info failed: aborting");
goto error;
}
if (info.exists) {
dummy = display_size((uint64_t)
extents * (vg->extent_size / 2),
SIZE_SHORT);
log_print("WARNING: Reducing active%s logical volume "
"to %s", info.open_count ? " and open" : "",
dummy);
log_print("THIS MAY DESTROY YOUR DATA "
"(filesystem etc.)");
dbg_free(dummy);
}
if (!arg_count(cmd, force_ARG)) {
if (yes_no_prompt("Do you really want to reduce %s?"
" [y/n]: ", lv_name) == 'n') {
log_print("Logical volume %s NOT reduced",
lv_name);
goto error;
}
}
if (!archive(vg))
goto error;
if (!lv_reduce(vg->fid, lv, lv->le_count - extents))
goto error;
}
if ((resize == LV_EXTEND && argc) &&
!(pvh = create_pv_list(cmd->mem, vg, argc - opt, argv + opt))) {
stack;
goto error;
}
if (resize == LV_EXTEND) {
if (!archive(vg))
goto error;
if (!argc) {
/* Use full list from VG */
pvh = &vg->pvs;
}
dummy = display_size((uint64_t)
extents * (vg->extent_size / 2),
SIZE_SHORT);
log_print("Extending logical volume %s to %s", lv_name, dummy);
dbg_free(dummy);
if (!lv_extend(vg->fid, lv, stripes, stripesize,
extents - lv->le_count, pvh))
goto error;
}
if (!lock_vol(cmd, lv->lvid.s, LCK_LV_SUSPEND | LCK_HOLD)) {
log_error("Can't get lock for %s", lv_name);
goto error;
}
/* store vg on disk(s) */
if (!vg_write(vg)) {
/* FIXME: Attempt reversion? */
unlock_lv(cmd, lv->lvid.s);
goto error;
}
backup(vg);
if (!unlock_lv(cmd, lv->lvid.s)) {
log_error("Problem reactivating %s", lv_name);
goto error;
}
unlock_vg(cmd, vg_name);
log_print("Logical volume %s successfully resized", lv_name);
return 0;
error:
unlock_vg(cmd, vg_name);
return ECMD_FAILED;
error_cmdline:
unlock_vg(cmd, vg_name);
return EINVALID_CMD_LINE;
}
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