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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 lvreduce(int argc, char **argv)
{
struct volume_group *vg;
struct logical_volume *lv;
struct list *lvh;
uint32_t extents = 0;
uint32_t size = 0;
sign_t sign = SIGN_NONE;
char *lv_name, *vg_name;
char *st;
int i;
if (arg_count(extents_ARG) + arg_count(size_ARG) != 1) {
log_error("Please specify either size or extents (not both)");
return EINVALID_CMD_LINE;
}
if (arg_count(extents_ARG)) {
extents = arg_int_value(extents_ARG, 0);
sign = arg_sign_value(extents_ARG, SIGN_NONE);
}
if (arg_count(size_ARG)) {
size = arg_int_value(size_ARG, 0);
sign = arg_sign_value(extents_ARG, SIGN_NONE);
}
if (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(fid, 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 (!(vg = fid->ops->vg_read(fid, vg_name))) {
log_error("Volume group %s doesn't exist", vg_name);
return ECMD_FAILED;
}
if (!(vg->status & ACTIVE)) {
log_error("Volume group %s must be active before changing a "
"logical volume", vg_name);
return ECMD_FAILED;
}
/* does LV exist? */
if (!(lvh = find_lv_in_vg(vg, lv_name))) {
log_error("Logical volume %s not found in volume group %s",
lv_name, vg_name);
return ECMD_FAILED;
}
lv = &list_item(lvh, struct lv_list)->lv;
if (!(lv->status & ACTIVE)) {
log_error("Logical volume %s must be active before reduction",
lv_name);
return ECMD_FAILED;
}
if (size) {
/* No of 512-byte sectors */
extents = size * 2;
if (extents % vg->extent_size) {
char *s1;
if (sign == SIGN_NONE)
extents += vg->extent_size -
(extents % vg->extent_size);
else
extents -= 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 (!extents) {
log_error("New size of 0 not permitted");
return EINVALID_CMD_LINE;
}
if (sign == SIGN_MINUS) {
if (extents >= lv->le_count) {
log_error("Unable to reduce %s below 1 extent",
lv_name);
return EINVALID_CMD_LINE;
}
extents = lv->le_count - extents;
} else {
if (extents >= lv->le_count) {
log_error("New size given (%d extents) not less than "
"existing size (%d extents)", extents,
lv->le_count);
return EINVALID_CMD_LINE;
}
}
/************ FIXME Stripes
size_rest = new_size % (vg->lv[l]->lv_stripes * vg->pe_size);
if (size_rest != 0) {
log_print
("rounding size %ld KB to stripe boundary size ",
new_size / 2);
new_size = new_size - size_rest;
printf("%ld KB\n", new_size / 2);
}
***********************/
if (lv->status & ACTIVE || lv_active(lv) > 0) {
char *dummy;
log_print("WARNING: Reducing active%s logical volume to %s",
(lv_open_count(lv) > 0) ? " and open" : "",
(dummy =
display_size(extents * vg->extent_size / 2,
SIZE_SHORT)));
log_print("THIS MAY DESTROY YOUR DATA (filesystem etc.)");
dbg_free(dummy);
}
if (!arg_count(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);
return ECMD_FAILED;
}
}
for (i = extents; i < lv->le_count; i++) {
lv->map[i].pv->pe_allocated--;
}
lv->le_count = extents;
/********* FIXME Suspend lv ***********/
/* store vg on disk(s) */
if (!fid->ops->vg_write(fid, vg))
return ECMD_FAILED;
/* FIXME Ensure it always displays errors? */
if (!lv_reactivate(lv))
return ECMD_FAILED;
/********* FIXME Resume *********/
/********* FIXME Backup
if ((ret = do_autobackup(vg_name, vg)))
return ret;
************/
log_print("Logical volume %s reduced", lv_name);
return 0;
}
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