mirror of
git://sourceware.org/git/lvm2.git
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366 lines
8.8 KiB
C
366 lines
8.8 KiB
C
/*
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* Copyright (C) 2001 Sistina Software
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*
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* LVM is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LVM is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LVM; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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#include "tools.h"
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int lvresize(int argc, char **argv)
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{
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struct volume_group *vg;
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struct logical_volume *lv;
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uint32_t extents = 0;
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uint32_t size = 0;
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uint32_t stripes = 0, stripesize = 0;
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uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
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uint32_t size_rest;
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sign_t sign = SIGN_NONE;
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char *lv_name, *vg_name;
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char *st;
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char *dummy;
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const char *cmd_name;
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struct list *lvh, *pvh, *pvl, *segh;
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int opt = 0;
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enum {
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LV_ANY = 0,
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LV_REDUCE = 1,
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LV_EXTEND = 2
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} resize = LV_ANY;
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cmd_name = command_name();
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if (!strcmp(cmd_name, "lvreduce"))
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resize = LV_REDUCE;
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if (!strcmp(cmd_name, "lvextend"))
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resize = LV_EXTEND;
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if (arg_count(extents_ARG) + arg_count(size_ARG) != 1) {
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log_error("Please specify either size or extents (not both)");
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return EINVALID_CMD_LINE;
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}
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if (arg_count(extents_ARG)) {
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extents = arg_int_value(extents_ARG, 0);
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sign = arg_sign_value(extents_ARG, SIGN_NONE);
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}
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if (arg_count(size_ARG)) {
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size = arg_int_value(size_ARG, 0);
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sign = arg_sign_value(size_ARG, SIGN_NONE);
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}
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if (resize == LV_EXTEND && sign == SIGN_MINUS) {
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log_error("Negative argument not permitted - use lvreduce");
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return EINVALID_CMD_LINE;
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}
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if (resize == LV_REDUCE && sign == SIGN_PLUS) {
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log_error("Positive sign not permitted - use lvextend");
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return EINVALID_CMD_LINE;
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}
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if (arg_count(stripes_ARG)) {
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log_print("Stripes not yet implemented in LVM2. Ignoring.");
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stripes = arg_int_value(stripes_ARG, 1);
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}
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if (arg_count(stripesize_ARG))
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stripesize = 2 * arg_int_value(stripesize_ARG, 0);
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if (!argc) {
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log_error("Please provide the logical volume name");
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return EINVALID_CMD_LINE;
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}
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lv_name = argv[0];
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argv++;
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argc--;
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if (!(vg_name = extract_vgname(fid, lv_name))) {
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log_error("Please provide a volume group name");
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return EINVALID_CMD_LINE;
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}
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if ((st = strrchr(lv_name, '/')))
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lv_name = st + 1;
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/* does VG exist? */
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log_verbose("Finding volume group %s", vg_name);
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if (!(vg = fid->ops->vg_read(fid, vg_name))) {
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log_error("Volume group %s doesn't exist", vg_name);
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return ECMD_FAILED;
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}
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/******* Remove requirement
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if (!(vg->status & ACTIVE)) {
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log_error("Volume group %s must be active before changing a "
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"logical volume", vg_name);
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return ECMD_FAILED;
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}
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********/
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/* does LV exist? */
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if (!(lvh = find_lv_in_vg(vg, lv_name))) {
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log_error("Logical volume %s not found in volume group %s",
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lv_name, vg_name);
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return ECMD_FAILED;
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}
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lv = &list_item(lvh, struct lv_list)->lv;
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/******* Remove requirement
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if (!(lv->status & ACTIVE)) {
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log_error("Logical volume %s must be active before change",
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lv_name);
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return ECMD_FAILED;
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}
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********/
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if (size) {
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/* No of 512-byte sectors */
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extents = size * 2;
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if (extents % vg->extent_size) {
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char *s1;
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if (sign == SIGN_MINUS)
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extents -= extents % vg->extent_size;
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else
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extents += vg->extent_size -
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(extents % vg->extent_size);
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log_print("Rounding up size to full physical extent %s",
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(s1 = display_size(extents / 2, SIZE_SHORT)));
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dbg_free(s1);
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}
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extents /= vg->extent_size;
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}
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if (sign == SIGN_PLUS)
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extents += lv->le_count;
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if (sign == SIGN_MINUS) {
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if (extents >= lv->le_count) {
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log_error("Unable to reduce %s below 1 extent",
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lv_name);
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return EINVALID_CMD_LINE;
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}
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extents = lv->le_count - extents;
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}
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if (!extents) {
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log_error("New size of 0 not permitted");
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return EINVALID_CMD_LINE;
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}
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if (extents == lv->le_count) {
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log_error("New size (%d extents) matches existing size "
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"(%d extents)", extents, lv->le_count);
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return EINVALID_CMD_LINE;
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}
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/* If extending, find stripes, stripesize & size of last segment */
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if (extents > lv->le_count &&
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!(stripes == 1 || (stripes > 1 && stripesize))) {
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list_iterate(segh, &lv->segments) {
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struct stripe_segment *seg;
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uint32_t sz, str;
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seg = list_item(segh, struct stripe_segment);
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sz = seg->stripe_size;
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str = seg->stripes;
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if ((seg_stripesize && seg_stripesize != sz
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&& !stripesize) ||
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(seg_stripes && seg_stripes != str && !stripes)) {
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log_error("Please specify number of "
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"stripes (-i) and stripesize (-I)");
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return EINVALID_CMD_LINE;
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}
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seg_stripesize = sz;
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seg_stripes = str;
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}
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if (!stripesize && stripes > 1)
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stripesize = seg_stripesize;
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if (!stripes)
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stripes = seg_stripes;
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seg_size = extents - lv->le_count;
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}
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/* If reducing, find stripes, stripesize & size of last segment */
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if (extents < lv->le_count) {
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uint32_t extents_used = 0;
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if (stripes || stripesize)
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log_error("Ignoring stripes and stripesize arguments "
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"when reducing");
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list_iterate(segh, &lv->segments) {
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struct stripe_segment *seg;
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uint32_t seg_extents;
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seg = list_item(segh, struct stripe_segment);
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seg_extents = seg->len;
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seg_stripesize = seg->stripe_size;
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seg_stripes = seg->stripes;
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if (extents <= extents_used + seg_extents)
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break;
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extents_used += seg_extents;
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}
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seg_size = extents - extents_used;
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stripesize = seg_stripesize;
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stripes = seg_stripes;
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}
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if ((size_rest = seg_size % stripes)) {
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log_print("Rounding size (%d extents) down to stripe boundary "
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"size of last segment (%d extents)", extents,
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extents - size_rest);
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extents = extents - size_rest;
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}
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if (extents == lv->le_count) {
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log_error("New size (%d extents) matches existing size "
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"(%d extents)", extents, lv->le_count);
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return EINVALID_CMD_LINE;
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}
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if (extents < lv->le_count) {
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if (resize == LV_EXTEND) {
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log_error("New size given (%d extents) not larger "
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"than existing size (%d extents)",
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extents, lv->le_count);
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return EINVALID_CMD_LINE;
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} else
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resize = LV_REDUCE;
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}
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if (extents > lv->le_count) {
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if (resize == LV_REDUCE) {
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log_error("New size given (%d extents) not less than "
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"existing size (%d extents)", extents,
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lv->le_count);
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return EINVALID_CMD_LINE;
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} else
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resize = LV_EXTEND;
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}
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if (resize == LV_REDUCE) {
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if (argc)
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log_print("Ignoring PVs on command line when reducing");
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if (lv_active(lv)) {
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dummy =
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display_size(extents * vg->extent_size / 2,
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SIZE_SHORT);
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log_print("WARNING: Reducing active%s logical volume "
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"to %s", lv_open_count(lv) ? " and open" : "",
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dummy);
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log_print("THIS MAY DESTROY YOUR DATA "
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"(filesystem etc.)");
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dbg_free(dummy);
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}
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if (!arg_count(force_ARG)) {
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if (yes_no_prompt("Do you really want to reduce %s?"
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" [y/n]: ", lv_name) == 'n') {
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log_print("Logical volume %s NOT reduced",
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lv_name);
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return ECMD_FAILED;
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}
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}
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if (!archive(vg))
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return ECMD_FAILED;
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if (!lv_reduce(lv, lv->le_count - extents))
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return ECMD_FAILED;
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}
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if (resize == LV_EXTEND && argc) {
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/* Build up list of PVs */
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if (!(pvh = pool_alloc(fid->cmd->mem, sizeof(struct list)))) {
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log_error("pvh list allocation failed");
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return ECMD_FAILED;
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}
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list_init(pvh);
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for (; opt < argc; opt++) {
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if (!(pvl = find_pv_in_vg(vg, argv[opt]))) {
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log_error("Physical Volume %s not found in "
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"Volume Group %s", argv[opt],
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vg->name);
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return EINVALID_CMD_LINE;
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}
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if (list_item(pvl, struct pv_list)->pv.pe_count ==
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list_item(pvl, struct pv_list)->pv.pe_allocated) {
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log_error("No free extents on physical volume"
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" %s", argv[opt]);
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continue;
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/* FIXME Buy check not empty at end! */
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}
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list_add(pvh, pvl);
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}
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}
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if (resize == LV_EXTEND) {
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if (!archive(vg))
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return ECMD_FAILED;
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if (!argc) {
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/* Use full list from VG */
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pvh = &vg->pvs;
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}
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dummy = display_size(extents * vg->extent_size / 2, SIZE_SHORT);
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log_print("Extending logical volume %s to %s", lv_name, dummy);
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dbg_free(dummy);
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if (!lv_extend(lv, stripes, stripesize, extents - lv->le_count,
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pvh))
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return ECMD_FAILED;
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}
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/********* FIXME Suspend lv ***********/
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/* store vg on disk(s) */
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if (!fid->ops->vg_write(fid, vg))
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return ECMD_FAILED;
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backup(vg);
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/* FIXME Ensure it always displays errors? */
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if (!lv_reactivate(lv))
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return ECMD_FAILED;
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/********* FIXME Resume *********/
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log_print("Logical volume %s successfully resized", lv_name);
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return 0;
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}
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