mirror of
git://sourceware.org/git/lvm2.git
synced 2024-12-22 17:35:59 +03:00
25b733809a
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.
366 lines
9.4 KiB
C
366 lines
9.4 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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static int lvchange_single(struct cmd_context *cmd, struct logical_volume *lv);
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static int lvchange_permission(struct cmd_context *cmd,
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struct logical_volume *lv);
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static int lvchange_availability(struct cmd_context *cmd,
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struct logical_volume *lv);
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static int lvchange_contiguous(struct cmd_context *cmd,
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struct logical_volume *lv);
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static int lvchange_readahead(struct cmd_context *cmd,
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struct logical_volume *lv);
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static int lvchange_persistent(struct cmd_context *cmd,
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struct logical_volume *lv);
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int lvchange(struct cmd_context *cmd, int argc, char **argv)
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{
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if (!arg_count(cmd, available_ARG) && !arg_count(cmd, contiguous_ARG)
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&& !arg_count(cmd, permission_ARG) && !arg_count(cmd, readahead_ARG)
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&& !arg_count(cmd, minor_ARG) && !arg_count(cmd, persistent_ARG)) {
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log_error("One or more of -a, -C, -m, -M, -p or -r required");
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return EINVALID_CMD_LINE;
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}
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if (!argc) {
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log_error("Please give logical volume path(s)");
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return EINVALID_CMD_LINE;
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}
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if (arg_count(cmd, minor_ARG) && argc != 1) {
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log_error("Only give one logical volume when specifying minor");
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return EINVALID_CMD_LINE;
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}
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return process_each_lv(cmd, argc, argv, LCK_VG_WRITE, &lvchange_single);
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}
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static int lvchange_single(struct cmd_context *cmd, struct logical_volume *lv)
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{
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int doit = 0;
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int archived = 0;
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if (!(lv->vg->status & LVM_WRITE) &&
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(arg_count(cmd, contiguous_ARG) || arg_count(cmd, permission_ARG) ||
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arg_count(cmd, readahead_ARG) || arg_count(cmd, persistent_ARG))) {
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log_error("Only -a permitted with read-only volume "
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"group \"%s\"", lv->vg->name);
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return EINVALID_CMD_LINE;
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}
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if (lv_is_origin(lv) &&
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(arg_count(cmd, contiguous_ARG) || arg_count(cmd, permission_ARG) ||
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arg_count(cmd, readahead_ARG) || arg_count(cmd, persistent_ARG))) {
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log_error("Can't change logical volume \"%s\" under snapshot",
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lv->name);
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return ECMD_FAILED;
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}
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if (lv_is_cow(lv)) {
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log_error("Can't change snapshot logical volume \"%s\"",
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lv->name);
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return ECMD_FAILED;
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}
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/* access permission change */
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if (arg_count(cmd, permission_ARG)) {
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if (!archive(lv->vg))
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return ECMD_FAILED;
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archived = 1;
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doit += lvchange_permission(cmd, lv);
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}
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/* allocation policy change */
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if (arg_count(cmd, contiguous_ARG)) {
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if (!archived && !archive(lv->vg))
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return ECMD_FAILED;
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archived = 1;
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doit += lvchange_contiguous(cmd, lv);
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}
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/* read ahead sector change */
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if (arg_count(cmd, readahead_ARG)) {
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if (!archived && !archive(lv->vg))
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return ECMD_FAILED;
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archived = 1;
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doit += lvchange_readahead(cmd, lv);
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}
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/* read ahead sector change */
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if (arg_count(cmd, persistent_ARG)) {
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if (!archived && !archive(lv->vg))
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return ECMD_FAILED;
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archived = 1;
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doit += lvchange_persistent(cmd, lv);
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}
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if (doit)
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log_print("Logical volume \"%s\" changed", lv->name);
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/* availability change */
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if (arg_count(cmd, available_ARG))
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if (!lvchange_availability(cmd, lv))
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return ECMD_FAILED;
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return 0;
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}
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static int lvchange_permission(struct cmd_context *cmd,
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struct logical_volume *lv)
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{
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int lv_access;
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lv_access = arg_int_value(cmd, permission_ARG, 0);
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if ((lv_access & LVM_WRITE) && (lv->status & LVM_WRITE)) {
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log_error("Logical volume \"%s\" is already writable",
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lv->name);
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return 0;
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}
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if (!(lv_access & LVM_WRITE) && !(lv->status & LVM_WRITE)) {
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log_error("Logical volume \"%s\" is already read only",
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lv->name);
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return 0;
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}
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if (lv_access & LVM_WRITE) {
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lv->status |= LVM_WRITE;
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log_verbose("Setting logical volume \"%s\" read/write",
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lv->name);
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} else {
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lv->status &= ~LVM_WRITE;
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log_verbose("Setting logical volume \"%s\" read-only",
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lv->name);
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}
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_SUSPEND | LCK_HOLD)) {
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log_error("Failed to lock %s", lv->name);
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return 0;
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}
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log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
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if (!(lv->vg)) {
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/* FIXME: Attempt reversion? */
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unlock_lv(cmd, lv->lvid.s);
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return 0;
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}
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backup(lv->vg);
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log_very_verbose("Updating permissions for \"%s\" in kernel", lv->name);
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if (!unlock_lv(cmd, lv->lvid.s)) {
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log_error("Problem reactivating %s", lv->name);
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return 0;
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}
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return 1;
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}
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static int lvchange_availability(struct cmd_context *cmd,
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struct logical_volume *lv)
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{
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int activate = 0;
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if (strcmp(arg_str_value(cmd, available_ARG, "n"), "n"))
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activate = 1;
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if (arg_count(cmd, minor_ARG)) {
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lv->minor = arg_int_value(cmd, minor_ARG, -1);
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}
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if (activate) {
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/* FIXME Tighter locking if lv_is_origin() */
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log_verbose("Activating logical volume \"%s\"", lv->name);
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_ACTIVATE))
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return 0;
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} else {
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log_verbose("Deactivating logical volume \"%s\"", lv->name);
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_DEACTIVATE))
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return 0;
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}
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return 1;
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}
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static int lvchange_contiguous(struct cmd_context *cmd,
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struct logical_volume *lv)
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{
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int lv_allocation = 0;
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if (strcmp(arg_str_value(cmd, contiguous_ARG, "n"), "n"))
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lv_allocation |= ALLOC_CONTIGUOUS;
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if ((lv_allocation & ALLOC_CONTIGUOUS) &&
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(lv->status & ALLOC_CONTIGUOUS)) {
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log_error("Allocation policy of logical volume \"%s\" is "
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"already contiguous", lv->name);
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return 0;
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}
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if (!(lv_allocation & ALLOC_CONTIGUOUS) &&
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!(lv->status & ALLOC_CONTIGUOUS)) {
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log_error
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("Allocation policy of logical volume \"%s\" is already"
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" not contiguous", lv->name);
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return 0;
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}
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/******** FIXME lv_check_contiguous?
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if ((lv_allocation & ALLOC_CONTIGUOUS)
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&& (ret = lv_check_contiguous(vg, lv_index + 1)) == FALSE) {
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log_error("No contiguous logical volume \"%s\"", lv->name);
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return 0;
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*********/
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if (lv_allocation & ALLOC_CONTIGUOUS) {
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lv->status |= ALLOC_CONTIGUOUS;
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log_verbose("Setting contiguous allocation policy for \"%s\"",
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lv->name);
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} else {
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lv->status &= ~ALLOC_CONTIGUOUS;
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log_verbose("Removing contiguous allocation policy for \"%s\"",
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lv->name);
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}
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_SUSPEND | LCK_HOLD)) {
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log_error("Failed to lock %s", lv->name);
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return 0;
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}
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log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
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if (!vg_write(lv->vg)) {
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/* FIXME: Attempt reversion? */
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unlock_lv(cmd, lv->lvid.s);
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return 0;
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}
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backup(lv->vg);
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if (!unlock_lv(cmd, lv->lvid.s)) {
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log_error("Problem reactivating %s", lv->name);
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return 0;
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}
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return 1;
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}
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static int lvchange_readahead(struct cmd_context *cmd,
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struct logical_volume *lv)
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{
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int read_ahead = 0;
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read_ahead = arg_int_value(cmd, readahead_ARG, 0);
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/******* FIXME Ranges?
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if (read_ahead < LVM_MIN_READ_AHEAD || read_ahead > LVM_MAX_READ_AHEAD) {
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log_error("read ahead sector argument is invalid");
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return 0;
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}
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********/
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if (lv->read_ahead == read_ahead) {
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log_error("Read ahead is already %u for \"%s\"",
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read_ahead, lv->name);
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return 0;
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}
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lv->read_ahead = read_ahead;
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log_verbose("Setting read ahead to %u for \"%s\"", read_ahead,
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lv->name);
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_SUSPEND | LCK_HOLD)) {
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log_error("Failed to lock %s", lv->name);
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return 0;
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}
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log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
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if (!vg_write(lv->vg)) {
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/* FIXME: Attempt reversion? */
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unlock_lv(cmd, lv->lvid.s);
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return 0;
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}
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backup(lv->vg);
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if (!unlock_lv(cmd, lv->lvid.s)) {
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log_error("Problem reactivating %s", lv->name);
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return 0;
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}
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return 1;
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}
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static int lvchange_persistent(struct cmd_context *cmd,
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struct logical_volume *lv)
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{
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if (!strcmp(arg_str_value(cmd, persistent_ARG, "n"), "n")) {
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if (!(lv->status & FIXED_MINOR)) {
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log_error("Minor number is already not persistent "
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"for \"%s\"", lv->name);
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return 0;
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}
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lv->status &= ~FIXED_MINOR;
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lv->minor = -1;
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log_verbose("Disabling persistent minor for \"%s\"", lv->name);
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} else {
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if (!arg_count(cmd, minor_ARG)) {
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log_error("Minor number must be specified with -My");
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return 0;
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}
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log_verbose("Ensuring %s is inactive. Reactivate with -ay.",
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lv->name);
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_DEACTIVATE)) {
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log_error("%s: deactivation failed", lv->name);
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return 0;
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}
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lv->status |= FIXED_MINOR;
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lv->minor = arg_int_value(cmd, minor_ARG, -1);
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log_verbose("Setting persistent minor number to %d for \"%s\"",
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lv->minor, lv->name);
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}
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if (!lock_vol(cmd, lv->lvid.s, LCK_LV_SUSPEND | LCK_HOLD)) {
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log_error("Failed to lock %s", lv->name);
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return 0;
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}
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log_very_verbose("Updating logical volume \"%s\" on disk(s)", lv->name);
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if (!vg_write(lv->vg)) {
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/* FIXME: Attempt reversion? */
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unlock_lv(cmd, lv->lvid.s);
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return 0;
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}
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backup(lv->vg);
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if (!unlock_lv(cmd, lv->lvid.s)) {
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log_error("Problem reactivating %s", lv->name);
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return 0;
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}
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return 1;
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}
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