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lvm2/scripts/blkdeactivate.sh.in

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#!/bin/bash
#
# Copyright (C) 2012-2015 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Author: Peter Rajnoha <prajnoha at redhat.com>
#
# Script for deactivating block devices
#
# Requires:
# bash >= 4.0 (associative array support)
# util-linux {
# lsblk >= 2.22 (lsblk -s support)
# umount
# }
# dmsetup >= 1.02.68 (--retry option support)
# lvm >= 2.2.89 (activation/retry_deactivation config support)
#
#set -x
shopt -s dotglob nullglob
TOOL=blkdeactivate
DEV_DIR='/dev'
SYS_BLK_DIR='/sys/block'
UMOUNT="/bin/umount"
DMSETUP="@sbindir@/dmsetup"
LVM="@sbindir@/lvm"
MDADM="@sbindir@/mdadm"
if $UMOUNT --help | grep -- "--all-targets" >$DEV_DIR/null; then
UMOUNT_OPTS="--all-targets "
else
UMOUNT_OPTS=""
FINDMNT="/bin/findmnt -r --noheadings -u -o TARGET"
FINDMNT_READ="read -r mnt"
fi
DMSETUP_OPTS=""
LVM_OPTS=""
MDADM_OPTS=""
LSBLK="/bin/lsblk -r --noheadings -o TYPE,KNAME,NAME,MOUNTPOINT"
LSBLK_VARS="local devtype local kname local name local mnt"
LSBLK_READ="read -r devtype kname name mnt"
SORT_MNT="/bin/sort -r -u -k 4"
# Do not show tool errors by default (only done/skipping summary
# message provided by this script) and no verbose mode by default.
ERRORS=0
VERBOSE=0
# Do not unmount mounted devices by default.
DO_UMOUNT=0
# Deactivate each LV separately by default (not the whole VG).
LVM_DO_WHOLE_VG=0
# Do not retry LV deactivation by default.
LVM_CONFIG="activation{retry_deactivation=0}"
#
# List of device names and/or VGs to be skipped.
# Device name is the KNAME from lsblk output.
#
# If deactivation of any device fails, it's automatically
# added to the SKIP_DEVICE_LIST (also a particular VG
# added to the SKIP_VG_LIST for a device that is an LV).
#
# These lists provide device tree pruning to skip
# particular device/VG deactivation that failed already.
# (lists are associative arrays!)
#
declare -A SKIP_DEVICE_LIST=()
declare -A SKIP_VG_LIST=()
#
# List of mountpoints to be skipped. Any device that is mounted on the mountpoint
# listed here will be added to SKIP_DEVICE_LIST (and SKIP_VG_LIST) automatically.
# (list is an associative array!)
#
declare -A SKIP_UMOUNT_LIST=(["/"]=1 ["/boot"]=1 \
["/lib"]=1 ["/lib64"]=1 \
["/bin"]=1 ["/sbin"]=1 \
["/var"]=1 ["/var/log"]=1 \
["/usr"]=1 \
["/usr/lib"]=1 ["/usr/lib64"]=1 \
["/usr/sbin"]=1 ["/usr/bin"]=1)
# Bash can't properly handle '[' and ']' used as a subscript
# within the '()'initialization - it needs to be done separately!
SKIP_UMOUNT_LIST["[SWAP]"]=1
usage() {
echo "${TOOL}: Utility to deactivate block devices"
echo
echo " ${TOOL} [options] [device...]"
echo " - Deactivate block device tree."
echo " If devices are specified, deactivate only supplied devices and their holders."
echo
echo " Options:"
echo " -e | --errors Show errors reported from tools"
echo " -h | --help Show this help message"
echo " -d | --dmoption DM_OPTIONS Comma separated DM specific options"
echo " -l | --lvmoption LVM_OPTIONS Comma separated LVM specific options"
echo " -u | --umount Unmount the device if mounted"
echo " -v | --verbose Verbose mode (also implies -e)"
echo
echo " Device specific options:"
echo " DM_OPTIONS:"
echo " retry retry removal several times in case of failure"
echo " force force device removal"
echo " LVM_OPTIONS:"
echo " retry retry removal several times in case of failure"
echo " wholevg deactivate the whole VG when processing an LV"
exit
}
add_device_to_skip_list() {
SKIP_DEVICE_LIST+=(["$kname"]=1)
return 1
}
add_vg_to_skip_list() {
SKIP_VG_LIST+=(["$DM_VG_NAME"]=1)
return 1
}
is_top_level_device() {
# top level devices do not have any holders, that is
# the SYS_BLK_DIR/<device_name>/holders dir is empty
files="`echo $SYS_BLK_DIR/$kname/holders/*`"
test -z "$files"
}
device_umount_one() {
test -z "$mnt" && return 0
if test -z "${SKIP_UMOUNT_LIST["$mnt"]}" -a "$DO_UMOUNT" -eq "1"; then
echo -n " [UMOUNT]: unmounting $name ($kname) mounted on $mnt... "
if eval $UMOUNT $UMOUNT_OPTS "$(printf $mnt)" $OUT $ERR; then
echo "done"
else
echo "skipping"
add_device_to_skip_list
fi
else
echo " [SKIP]: unmount of $name ($kname) mounted on $mnt"
add_device_to_skip_list
fi
}
device_umount() {
test "$devtype" != "lvm" && test "${kname:0:3}" != "dm-" && return 0
# FINDMNT is defined only if umount --all-targets is not available.
# In that case, read the list of multiple mount points of one device
# using FINDMNT and unmount it one by one manually.
if test -z "$FINDMNT"; then
device_umount_one
else
while $FINDMNT_READ; do
device_umount_one || return 1
done <<< "`$FINDMNT $DEV_DIR/$kname`"
fi
}
deactivate_holders () {
local skip=1; $LSBLK_VARS
# Get holders for the device - either a mount or another device.
# First line on the lsblk output is the device itself - skip it for
# the deactivate call as this device is already being deactivated.
while $LSBLK_READ; do
test -e $SYS_BLK_DIR/$kname || continue
# check if the device not on the skip list already
test -z ${SKIP_DEVICE_LIST["$kname"]} || return 1
# try to deactivate the holder
test $skip -eq 1 && skip=0 && continue
deactivate || return 1
done <<< "`$LSBLK $1`"
}
deactivate_dm () {
local name=$(printf $name)
test -b "$DEV_DIR/mapper/$name" || return 0
test -z ${SKIP_DEVICE_LIST["$kname"]} || return 1
deactivate_holders "$DEV_DIR/mapper/$name" || return 1
echo -n " [DM]: deactivating $devtype device $name ($kname)... "
if eval $DMSETUP $DMSETUP_OPTS remove "$name" $OUT $ERR; then
echo "done"
else
echo "skipping"
add_device_to_skip_list
fi
}
deactivate_lvm () {
local DM_VG_NAME; local DM_LV_NAME; local DM_LV_LAYER
eval $(eval $DMSETUP splitname --nameprefixes --noheadings --rows "$name" LVM $ERR)
test -b "$DEV_DIR/$DM_VG_NAME/$DM_LV_NAME" || return 0
test -z ${SKIP_VG_LIST["$DM_VG_NAME"]} || return 1
if test $LVM_DO_WHOLE_VG -eq 0; then
# Skip LVM device deactivation if LVM tools missing.
test $LVM_AVAILABLE -eq 0 && {
add_device_to_skip_list
return 1
}
# Deactivating only the LV specified
deactivate_holders "$DEV_DIR/$DM_VG_NAME/$DM_LV_NAME" || {
add_device_to_skip_list
return 1
}
echo -n " [LVM]: deactivating Logical Volume $DM_VG_NAME/$DM_LV_NAME... "
if eval $LVM lvchange $LVM_OPTS --config \'log{prefix=\"\"} $LVM_CONFIG\' -aln $DM_VG_NAME/$DM_LV_NAME $OUT $ERR; then
echo "done"
else
echo "skipping"
add_device_to_skip_list
fi
else
# Skip LVM VG deactivation if LVM tools missing.
test $LVM_AVAILABLE -eq 0 && {
add_vg_to_skip_list
return 1
}
# Deactivating the whole VG the LV is part of
lv_list=$(eval $LVM vgs --config "$LVM_CONFIG" --noheadings --rows -o lv_name $DM_VG_NAME $ERR)
for lv in $lv_list; do
test -b "$DEV_DIR/$DM_VG_NAME/$lv" || continue
deactivate_holders "$DEV_DIR/$DM_VG_NAME/$lv" || {
add_vg_to_skip_list
return 1
}
done
echo -n " [LVM]: deactivating Volume Group $DM_VG_NAME... "
if eval $LVM vgchange $LVM_OPTS --config \'log{prefix=\" \"} $LVM_CONFIG\' -aln $DM_VG_NAME $OUT $ERR; then
echo "done"
else
echo "skipping"
add_vg_to_skip_list
fi
fi
}
deactivate_md () {
local name=$(printf $name)
test -b "$DEV_DIR/$name" || return 0
test -z ${SKIP_DEVICE_LIST["$kname"]} || return 1
# Skip MD device deactivation if MD tools missing.
test $MDADM_AVAILABLE -eq 0 && {
add_device_to_skip_list
return 1
}
deactivate_holders "$DEV_DIR/$name" || return 1
echo -n " [MD]: deactivating $devtype device $kname... "
if eval $MDADM $MDADM_OPTS -S "$name" $OUT $ERR; then
echo "done"
else
echo "skipping"
add_device_to_skip_list
fi
}
deactivate () {
######################################################################
# DEACTIVATION HOOKS FOR NEW DEVICE TYPES GO HERE! #
# #
# Identify a new device type either by inspecting the TYPE provided #
# by lsblk directly ($devtype) or by any other mean that is suitable #
# e.g. the KNAME provided by lsblk ($kname). See $LSBLK_VARS for #
# complete list of variables that may be used. Then call a #
# device-specific deactivation function that handles the exact type. #
# #
# This device-specific function will certainly need to call #
# deactivate_holders first to recursively deactivate any existing #
# holders it might have before deactivating the device it processes. #
######################################################################
if test "$devtype" = "lvm"; then
deactivate_lvm
elif test "${kname:0:3}" = "dm-"; then
deactivate_dm
elif test "${kname:0:2}" = "md"; then
deactivate_md
fi
}
deactivate_all() {
$LSBLK_VARS
skip=0
echo "Deactivating block devices:"
if test $# -eq 0; then
#######################
# Process all devices #
#######################
# Unmount all relevant mountpoints first
while $LSBLK_READ; do
device_umount
done <<< "`$LSBLK | $SORT_MNT`"
# Do deactivate
while $LSBLK_READ; do
# 'disk' is at the bottom already and it's a real device
test "$devtype" = "disk" && continue
# if deactivation of any device fails, skip processing
# any subsequent devices within its subtree as the
# top-level device could not be deactivated anyway
test $skip -eq 1 && {
# reset 'skip' on top level device
is_top_level_device && skip=0 || continue
}
# check if the device is not on the skip list already
test -z ${SKIP_DEVICE_LIST["$kname"]} || continue
# try to deactivate top-level device, set 'skip=1'
# if it fails to do so - this will cause all the
# device's subtree to be skipped when processing
# devices further in this loop
deactivate || skip=1
done <<< "`$LSBLK -s`"
else
##################################
# Process only specified devices #
##################################
while test $# -ne 0; do
# Unmount all relevant mountpoints first
while $LSBLK_READ; do
device_umount
done <<< "`$LSBLK $1 | $SORT_MNT`"
# Do deactivate
# Single dm device tree deactivation.
if test -b "$1"; then
$LSBLK_READ <<< "`$LSBLK --nodeps $1`"
# check if the device is not on the skip list already
test -z ${SKIP_DEVICE_LIST["$kname"]} || {
shift
continue
}
deactivate
else
echo "$1: device not found"
return 1
fi
shift
done;
fi
}
get_dmopts() {
ORIG_IFS=$IFS; IFS=','
for opt in $1; do
case $opt in
"") ;;
"retry") DMSETUP_OPTS+="--retry " ;;
"force") DMSETUP_OPTS+="--force " ;;
*) echo "$opt: unknown DM option"
esac
done
IFS=$ORIG_IFS
}
get_lvmopts() {
ORIG_IFS=$IFS; IFS=','
for opt in $1; do
case "$opt" in
"") ;;
"retry") LVM_CONFIG="activation{retry_deactivation=1}" ;;
"wholevg") LVM_DO_WHOLE_VG=1 ;;
*) echo "$opt: unknown LVM option"
esac
done
IFS=$ORIG_IFS
}
set_env() {
if test "$ERRORS" -eq "1"; then
unset ERR
else
ERR="2>$DEV_DIR/null"
fi
if test "$VERBOSE" -eq "1"; then
unset OUT
UMOUNT_OPTS+="-v"
DMSETUP_OPTS+="-vvvv"
LVM_OPTS+="-vvvv"
MDADM_OPTS+="-vv"
else
OUT="1>$DEV_DIR/null"
fi
if test -f $LVM; then
LVM_AVAILABLE=1
else
LVM_AVAILABLE=0
fi
if test -f $MDADM; then
MDADM_AVAILABLE=1
else
MDADM_AVAILABLE=0
fi
}
while test $# -ne 0; do
case "$1" in
"") ;;
"-e"|"--errors") ERRORS=1 ;;
"-h"|"--help") usage ;;
"-d"|"--dmoption ") get_dmopts "$2" ; shift ;;
"-l"|"--lvmoption ") get_lvmopts "$2" ; shift ;;
"-u"|"--umount") DO_UMOUNT=1 ;;
"-v"|"--verbose") VERBOSE=1 ; ERRORS=1 ;;
"-vv") VERBOSE=1 ; ERRORS=1 ; set -x ;;
*) break ;;
esac
shift
done
set_env
deactivate_all "$@"
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