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314 lines
9.1 KiB
Bash
314 lines
9.1 KiB
Bash
#!/bin/bash
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#
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# Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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#
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# This file is part of LVM2.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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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 this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Author: Peter Rajnoha <prajnoha at redhat.com>
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#
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# Script for deactivating block devices
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#
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# Requires:
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# bash >= 4.0 (associative array support)
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# lsblk >= 2.22 (lsblk -s support)
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# umount
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# dmsetup >= 1.02.68 (--retry option support)
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# lvm >= 2.2.89 (activation/retry_deactivation config support)
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#
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#set -x
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shopt -s dotglob nullglob
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TOOL=blkdeactivate
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DEV_DIR='/dev'
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SYS_BLK_DIR='/sys/block'
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UMOUNT="/bin/umount"
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DMSETUP="@sbindir@/dmsetup"
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LVM="@sbindir@/lvm"
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LSBLK="/bin/lsblk -r --noheadings -o TYPE,KNAME,NAME,MOUNTPOINT"
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LSBLK_VARS="local devtype local kname local name local mnt"
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LSBLK_READ="read -r devtype kname name mnt"
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# Do not unmount mounted devices by default.
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DO_UMOUNT=0
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# Deactivate each LV separately by default (not the whole VG).
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LVM_DO_WHOLE_VG=0
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# Do not retry LV deactivation by default.
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LVM_CONFIG="activation{retry_deactivation=0}"
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#
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# List of device names and/or VGs to be skipped.
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# Device name is the KNAME from lsblk output.
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#
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# If deactivation of any device fails, it's automatically
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# added to the SKIP_DEVICE_LIST (also a particular VG
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# added to the SKIP_VG_LIST for a device that is an LV).
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#
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# These lists provide device tree pruning to skip
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# particular device/VG deactivation that failed already.
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# (lists are associative arrays!)
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#
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declare -A SKIP_DEVICE_LIST=()
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declare -A SKIP_VG_LIST=()
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#
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# List of mountpoints to be skipped. Any device that is mounted on the mountpoint
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# listed here will be added to SKIP_DEVICE_LIST (and SKIP_VG_LIST) automatically.
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# (list is an associative array!)
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#
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declare -A SKIP_UMOUNT_LIST=(["/"]=1 ["/boot"]=1 \
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["/lib"]=1 ["/lib64"]=1 \
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["/bin"]=1 ["/sbin"]=1 \
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["/usr"]=1 \
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["/usr/lib"]=1 ["/usr/lib64"]=1 \
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["/usr/sbin"]=1 ["/usr/bin"]=1)
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# Bash can't properly handle '[' and ']' used as a subscript
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# within the '()'initialization - it needs to be done separately!
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SKIP_UMOUNT_LIST["[SWAP]"]=1
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usage() {
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echo "${TOOL}: Utility to deactivate block devices"
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echo
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echo " ${TOOL} [options] [device...]"
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echo " - Deactivate block device tree."
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echo " If devices are specified, deactivate only supplied devices and their holders."
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echo
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echo " Options:"
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echo " -h | --help Show this help message"
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echo " -d | --dmoption DM_OPTIONS Comma separated DM specific options"
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echo " -l | --lvmoption LVM_OPTIONS Comma separated LVM specific options"
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echo " -u | --umount Unmount the device if mounted"
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echo
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echo " Device specific options:"
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echo " DM_OPTIONS:"
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echo " retry retry removal several times in case of failure"
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echo " force force device removal"
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echo " LVM_OPTIONS:"
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echo " retry retry removal several times in case of failure"
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echo " wholevg deactivate the whole VG when processing an LV"
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exit
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}
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add_device_to_skip_list() {
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SKIP_DEVICE_LIST+=(["$kname"]=1)
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return 1
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}
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add_vg_to_skip_list() {
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SKIP_VG_LIST+=(["$DM_VG_NAME"]=1)
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return 1
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}
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is_top_level_device() {
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# top level devices do not have any holders, that is
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# the SYS_BLK_DIR/<device_name>/holders dir is empty
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files="`echo $SYS_BLK_DIR/$kname/holders/*`"
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test -z "$files"
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}
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device_umount () {
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test -z "$mnt" && return 0;
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if test -z "${SKIP_UMOUNT_LIST["$mnt"]}" -a "$DO_UMOUNT" -eq "1"; then
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echo " UMOUNT: unmounting $name ($kname) mounted on $mnt"
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$UMOUNT "$mnt" || add_device_to_skip_list
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else
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echo " [SKIP]: unmount of $name ($kname) mounted on $mnt"
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add_device_to_skip_list
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fi
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}
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deactivate_holders () {
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local skip=1; $LSBLK_VARS
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# Get holders for the device - either a mount or another device.
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# First line on the lsblk output is the device itself - skip it for
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# the deactivate call as this device is already being deactivated.
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while $LSBLK_READ; do
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test -e $SYS_BLK_DIR/$kname || continue
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# check if the device not on the skip list already
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test -z ${SKIP_DEVICE_LIST["$kname"]} || return 1
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# try to unmount it if mounted
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device_umount || return 1
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# try to deactivate the holder
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test $skip -eq 1 && skip=0 && continue
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deactivate || return 1
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done <<< "`$LSBLK $1`"
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}
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deactivate_dm () {
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local name=$(printf $name)
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test -b "$DEV_DIR/mapper/$name" || return 0
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test -z ${SKIP_DEVICE_LIST["$kname"]} || return 1
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deactivate_holders "$DEV_DIR/mapper/$name" || return 1
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echo " DM: deactivating $devtype device $name ($kname)"
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$DMSETUP $DMSETUP_OPTS remove "$name" || add_device_to_skip_list
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}
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deactivate_lvm () {
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local DM_VG_NAME; local DM_LV_NAME; local DM_LV_LAYER
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eval $($DMSETUP splitname --nameprefixes --noheadings --rows "$name" LVM)
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test -b "$DEV_DIR/$DM_VG_NAME/$DM_LV_NAME" || return 0
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test -z ${SKIP_VG_LIST["$DM_VG_NAME"]} || return 1
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# Deactivating only the LV specified
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test $LVM_DO_WHOLE_VG -eq 0 && {
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deactivate_holders "$DEV_DIR/$DM_VG_NAME/$DM_LV_NAME" || {
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add_device_to_skip_list
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return 1
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}
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echo " LVM: deactivating Logical Volume $DM_VG_NAME/$DM_LV_NAME"
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$LVM lvchange --config "log{prefix=\"\"} $LVM_CONFIG" -aln $DM_VG_NAME/$DM_LV_NAME || {
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add_device_to_skip_list
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return 1
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}
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return 0
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}
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# Deactivating the whole VG the LV is part of
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lv_list=$($LVM vgs --config "$LVM_CONFIG" --noheadings --rows -o lv_name $DM_VG_NAME)
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for lv in $lv_list; do
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test -b "$DEV_DIR/$DM_VG_NAME/$lv" || continue
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deactivate_holders "$DEV_DIR/$DM_VG_NAME/$lv" || {
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add_vg_to_skip_list
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return 1
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}
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done
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echo " LVM: deactivating Volume Group $DM_VG_NAME"
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$LVM vgchange --config "log{prefix=\" \"} $LVM_CONFIG" -aln $DM_VG_NAME || add_vg_to_skip_list
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}
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deactivate () {
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######################################################################
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# DEACTIVATION HOOKS FOR NEW DEVICE TYPES GO HERE! #
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# #
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# Identify a new device type either by inspecting the TYPE provided #
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# by lsblk directly ($devtype) or by any other mean that is suitable #
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# e.g. the KNAME provided by lsblk ($kname). See $LSBLK_VARS for #
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# complete list of variables that may be used. Then call a #
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# device-specific deactivation function that handles the exact type. #
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# #
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# This device-specific function will certainly need to call #
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# deactivate_holders first to recursively deactivate any existing #
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# holders it might have before deactivating the device it processes. #
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######################################################################
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if test "$devtype" = "lvm"; then
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deactivate_lvm
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elif test "${kname:0:3}" = "dm-"; then
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deactivate_dm
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fi
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}
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deactivate_all() {
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$LSBLK_VARS
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skip=0
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echo "Deactivating block devices:"
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if test $# -eq 0; then
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# Deactivate all devices
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while $LSBLK_READ; do
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# 'disk' is at the bottom already and it's a real device
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test "$devtype" = "disk" && continue
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# if deactivation of any device fails, skip processing
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# any subsequent devices within its subtree as the
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# top-level device could not be deactivated anyway
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test $skip -eq 1 && {
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# reset 'skip' on top level device
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is_top_level_device && skip=0 || continue
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}
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# check if the device is not on the skip list already
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test -z ${SKIP_DEVICE_LIST["$kname"]} || continue
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# try to deactivate top-level device, set 'skip=1'
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# if it fails to do so - this will cause all the
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# device's subtree to be skipped when processing
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# devices further in this loop
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deactivate || skip=1
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done <<< "`$LSBLK -s`"
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else
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# Deactivate only specified devices
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while test $# -ne 0; do
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# Single dm device tree deactivation.
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if test -b "$1"; then
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$LSBLK_READ <<< "`$LSBLK --nodeps $1`"
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# check if the device is not on the skip list already
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test -z ${SKIP_DEVICE_LIST["$kname"]} || continue
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deactivate
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else
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echo "$1: device not found"
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return 1
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fi
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shift
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done;
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fi
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}
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get_dmopts() {
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ORIG_IFS=$IFS; IFS=','
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for opt in $1; do
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case $opt in
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"") ;;
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"retry") DMSETUP_OPTS+="--retry " ;;
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"force") DMSETUP_OPTS+="--force " ;;
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*) echo "$opt: unknown DM option"
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esac
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done
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IFS=$ORIG_IFS
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}
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get_lvmopts() {
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ORIG_IFS=$IFS; IFS=','
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for opt in $1; do
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case "$opt" in
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"") ;;
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"retry") LVM_CONFIG="activation{retry_deactivation=1}" ;;
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"wholevg") LVM_DO_WHOLE_VG=1 ;;
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*) echo "$opt: unknown LVM option"
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esac
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done
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IFS=$ORIG_IFS
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}
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while test $# -ne 0; do
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case "$1" in
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"") ;;
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"-h"|"--help") usage ;;
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"-d"|"--dmoption ") get_dmopts "$2" ; shift ;;
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"-l"|"--lvmoption ") get_lvmopts "$2" ; shift ;;
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"-u"|"--umount") DO_UMOUNT=1 ;;
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*) break ;;
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esac
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shift
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done
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deactivate_all "$@"
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