mirror of
git://sourceware.org/git/lvm2.git
synced 2024-10-28 03:27:58 +03:00
7a4e27eee5
This removes dependency on lvm binary - if it's not present, all LVM processing is skipped (shouldn't normally happen because if lvm binary is missing then there's obviously nothing that would activate it, but let's make sure). Without this tight dependency on lvm, the blkdeactivate script can be packaged with libdevmapper/dmsetup (in contrast to lvm as it was before) and as such the script can still be used to handle other DM devices.
423 lines
12 KiB
Bash
423 lines
12 KiB
Bash
#!/bin/bash
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#
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# Copyright (C) 2012-2015 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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# util-linux {
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# lsblk >= 2.22 (lsblk -s support)
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# umount
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# }
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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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if $UMOUNT --help | grep -- "--all-targets" >$DEV_DIR/null; then
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UMOUNT_OPTS="--all-targets "
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else
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UMOUNT_OPTS=""
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FINDMNT="/bin/findmnt -r --noheadings -u -o TARGET"
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FINDMNT_READ="read -r mnt"
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fi
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DMSETUP_OPTS=""
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LVM_OPTS=""
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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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SORT_MNT="/bin/sort -r -u -k 4"
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# Do not show tool errors by default (only done/skipping summary
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# message provided by this script) and no verbose mode by default.
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ERRORS=0
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VERBOSE=0
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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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["/var"]=1 ["/var/log"]=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 " -e | --errors Show errors reported from tools"
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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 " -v | --verbose Verbose mode (also implies -e)"
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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 "$files"
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}
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device_umount_one() {
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test -z "$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 -n " [UMOUNT]: unmounting $name ($kname) mounted on $mnt... "
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if eval $UMOUNT $UMOUNT_OPTS "$(printf $mnt)" $OUT $ERR; then
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echo "done"
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else
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echo "skipping"
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add_device_to_skip_list
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fi
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else
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echo " [SKIP]: unmount of $name ($kname) mounted on $mnt"
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add_device_to_skip_list
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fi
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}
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device_umount() {
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test "$devtype" != "lvm" && test "${kname:0:3}" != "dm-" && return 0
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# FINDMNT is defined only if umount --all-targets is not available.
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# In that case, read the list of multiple mount points of one device
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# using FINDMNT and unmount it one by one manually.
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if test -z "$FINDMNT"; then
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device_umount_one
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else
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while $FINDMNT_READ; do
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device_umount_one || return 1
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done <<< "`$FINDMNT $DEV_DIR/$kname`"
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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 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 -n " [DM]: deactivating $devtype device $name ($kname)... "
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if eval $DMSETUP $DMSETUP_OPTS remove "$name" $OUT $ERR; then
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echo "done"
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else
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echo "skipping"
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add_device_to_skip_list
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fi
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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 $(eval $DMSETUP splitname --nameprefixes --noheadings --rows "$name" LVM $ERR)
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test -b "$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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if test $LVM_DO_WHOLE_VG -eq 0; then
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# Skip LVM device deactivation if LVM tools missing.
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test $LVM_AVAILABLE -eq 0 && {
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add_device_to_skip_list
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return 1
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}
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# Deactivating only the LV specified
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deactivate_holders "$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 -n " [LVM]: deactivating Logical Volume $DM_VG_NAME/$DM_LV_NAME... "
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if eval $LVM lvchange $LVM_OPTS --config \'log{prefix=\"\"} $LVM_CONFIG\' -aln $DM_VG_NAME/$DM_LV_NAME $OUT $ERR; then
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echo "done"
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else
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echo "skipping"
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add_device_to_skip_list
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fi
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else
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# Skip LVM VG deactivation if LVM tools missing.
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test $LVM_AVAILABLE -eq 0 && {
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add_vg_to_skip_list
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return 1
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}
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# Deactivating the whole VG the LV is part of
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lv_list=$(eval $LVM vgs --config "$LVM_CONFIG" --noheadings --rows -o lv_name $DM_VG_NAME $ERR)
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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 -n " [LVM]: deactivating Volume Group $DM_VG_NAME... "
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if eval $LVM vgchange $LVM_OPTS --config \'log{prefix=\" \"} $LVM_CONFIG\' -aln $DM_VG_NAME $OUT $ERR; then
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echo "done"
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else
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echo "skipping"
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add_vg_to_skip_list
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fi
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fi
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}
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deactivate () {
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######################################################################
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# DEACTIVATION HOOKS FOR NEW DEVICE TYPES GO HERE! #
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# #
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# Identify a new device type either by inspecting the TYPE provided #
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# by lsblk directly ($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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#######################
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# Process all devices #
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#######################
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# Unmount all relevant mountpoints first
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while $LSBLK_READ; do
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device_umount
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done <<< "`$LSBLK | $SORT_MNT`"
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# Do deactivate
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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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##################################
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# Process only specified devices #
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##################################
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while test $# -ne 0; do
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# Unmount all relevant mountpoints first
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while $LSBLK_READ; do
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device_umount
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done <<< "`$LSBLK $1 | $SORT_MNT`"
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# Do deactivate
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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"]} || {
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shift
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continue
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}
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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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set_env() {
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if test "$ERRORS" -eq "1"; then
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unset ERR
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else
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ERR="2>$DEV_DIR/null"
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fi
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if test "$VERBOSE" -eq "1"; then
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unset OUT
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UMOUNT_OPTS+="-v"
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DMSETUP_OPTS+="-vvvv"
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LVM_OPTS+="-vvvv"
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else
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OUT="1>$DEV_DIR/null"
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fi
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if test -f $LVM; then
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LVM_AVAILABLE=1
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else
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LVM_AVAILABLE=0
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fi
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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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"-e"|"--errors") ERRORS=1 ;;
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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 "$2" ; shift ;;
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"-u"|"--umount") DO_UMOUNT=1 ;;
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"-v"|"--verbose") VERBOSE=1 ; ERRORS=1 ;;
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"-vv") VERBOSE=1 ; ERRORS=1 ; set -x ;;
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*) break ;;
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esac
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shift
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done
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set_env
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deactivate_all "$@"
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