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#!/bin/bash
#
# Copyright (C) 2007-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# Author: Zdenek Kabelac <zkabelac at redhat.com>
#
# Script for resizing devices (usable for LVM resize)
#
# Needed utilities:
# mount, umount, grep, readlink, blockdev, blkid, fsck, xfs_check
#
# ext2/ext3/ext4: resize2fs, tune2fs
# reiserfs: resize_reiserfs, reiserfstune
# xfs: xfs_growfs, xfs_info
#
# Return values:
# 0 success
# 1 error
# 2 break detected
# 3 unsupported online filesystem check for given mounted fs
TOOL=fsadm
_SAVEPATH=$PATH
PATH=/sbin:/usr/sbin:/bin:/usr/sbin:$PATH
# utilities
TUNE_EXT=tune2fs
RESIZE_EXT=resize2fs
TUNE_REISER=reiserfstune
RESIZE_REISER=resize_reiserfs
TUNE_XFS=xfs_info
RESIZE_XFS=xfs_growfs
MOUNT=mount
UMOUNT=umount
MKDIR=mkdir
RMDIR=rmdir
BLOCKDEV=blockdev
BLKID=blkid
DATE=date
GREP=grep
READLINK=readlink
READLINK_E="-e"
FSCK=fsck
XFS_CHECK=xfs_check
# XFS_REPAIR -n is used when XFS_CHECK is not found
XFS_REPAIR=xfs_repair
# user may override lvm location by setting LVM_BINARY
LVM=${LVM_BINARY:-lvm}
YES=${_FSADM_YES}
DRY=0
VERB=
FORCE=
EXTOFF=${_FSADM_EXTOFF:-0}
DO_LVRESIZE=0
FSTYPE=unknown
VOLUME=unknown
TEMPDIR="${TMPDIR:-/tmp}/${TOOL}_${RANDOM}$$/m"
DM_DEV_DIR="${DM_DEV_DIR:-/dev}"
BLOCKSIZE=
BLOCKCOUNT=
MOUNTPOINT=
MOUNTED=
REMOUNT=
PROCMOUNTS="/proc/mounts"
PROCSELFMOUNTINFO="/proc/self/mountinfo"
NULL="$DM_DEV_DIR/null"
IFS_OLD=$IFS
# without bash $'\n'
NL='
'
tool_usage() {
echo "${TOOL}: Utility to resize or check the filesystem on a device"
echo
echo " ${TOOL} [options] check <device>"
echo " - Check the filesystem on device using fsck"
echo
echo " ${TOOL} [options] resize <device> [<new_size>[BKMGTPE]]"
echo " - Change the size of the filesystem on device to new_size"
echo
echo " Options:"
echo " -h | --help Show this help message"
echo " -v | --verbose Be verbose"
echo " -e | --ext-offline unmount filesystem before ext2/ext3/ext4 resize"
echo " -f | --force Bypass sanity checks"
echo " -n | --dry-run Print commands without running them"
echo " -l | --lvresize Resize given device (if it is LVM device)"
echo " -y | --yes Answer \"yes\" at any prompts"
echo
echo " new_size - Absolute number of filesystem blocks to be in the filesystem,"
echo " or an absolute size using a suffix (in powers of 1024)."
echo " If new_size is not supplied, the whole device is used."
exit
}
verbose() {
test -n "$VERB" && echo "$TOOL: $@" || true
}
error() {
echo "$TOOL: $@" >&2
cleanup 1
}
dry() {
if [ "$DRY" -ne 0 ]; then
verbose "Dry execution $@"
return 0
fi
verbose "Executing $@"
"$@"
}
cleanup() {
trap '' 2
# reset MOUNTPOINT - avoid recursion
test "$MOUNTPOINT" = "$TEMPDIR" && MOUNTPOINT="" temp_umount
if [ -n "$REMOUNT" ]; then
verbose "Remounting unmounted filesystem back"
dry "$MOUNT" "$VOLUME" "$MOUNTED"
fi
IFS=$IFS_OLD
trap 2
test "$1" -eq 2 && verbose "Break detected"
if [ "$DO_LVRESIZE" -eq 2 ]; then
# start LVRESIZE with the filesystem modification flag
# and allow recursive call of fsadm
_FSADM_YES=$YES
_FSADM_EXTOFF=$EXTOFF
export _FSADM_YES _FSADM_EXTOFF
unset FSADM_RUNNING
test -n "$LVM_BINARY" && PATH=$_SAVEPATH
dry exec "$LVM" lvresize $VERB $FORCE -r -L${NEWSIZE}b "$VOLUME_ORIG"
fi
# error exit status for break
exit ${1:-1}
}
# convert parameter from Exa/Peta/Tera/Giga/Mega/Kilo/Bytes and blocks
# (2^(60/50/40/30/20/10/0))
decode_size() {
case "$1" in
*[eE]) NEWSIZE=$(( ${1%[eE]} * 1152921504606846976 )) ;;
*[pP]) NEWSIZE=$(( ${1%[pP]} * 1125899906842624 )) ;;
*[tT]) NEWSIZE=$(( ${1%[tT]} * 1099511627776 )) ;;
*[gG]) NEWSIZE=$(( ${1%[gG]} * 1073741824 )) ;;
*[mM]) NEWSIZE=$(( ${1%[mM]} * 1048576 )) ;;
*[kK]) NEWSIZE=$(( ${1%[kK]} * 1024 )) ;;
*[bB]) NEWSIZE=${1%[bB]} ;;
*) NEWSIZE=$(( $1 * $2 )) ;;
esac
#NEWBLOCKCOUNT=$(round_block_size $NEWSIZE $2)
NEWBLOCKCOUNT=$(( $NEWSIZE / $2 ))
if [ $DO_LVRESIZE -eq 1 ]; then
# start lvresize, but first cleanup mounted dirs
DO_LVRESIZE=2
cleanup 0
fi
}
# detect filesystem on the given device
# dereference device name if it is symbolic link
detect_fs() {
VOLUME_ORIG=$1
VOLUME=${1/#"${DM_DEV_DIR}/"/}
VOLUME=$("$READLINK" $READLINK_E "$DM_DEV_DIR/$VOLUME") || error "Cannot get readlink \"$1\""
RVOLUME=$VOLUME
case "$RVOLUME" in
# hardcoded /dev since udev does not create these entries elsewhere
/dev/dm-[0-9]*)
read </sys/block/${RVOLUME#/dev/}/dm/name SYSVOLUME 2>&1 && VOLUME="$DM_DEV_DIR/mapper/$SYSVOLUME"
read </sys/block/${RVOLUME#/dev/}/dev MAJORMINOR 2>&1 || error "Cannot get major:minor for \"$VOLUME\""
;;
*)
STAT=$(stat --format "MAJOR=%t MINOR=%T" ${RVOLUME}) || error "Cannot get major:minor for \"$VOLUME\""
eval $STAT
MAJOR=$((0x${MAJOR}))
MINOR=$((0x${MINOR}))
MAJORMINOR=${MAJOR}:${MINOR}
;;
esac
# use null device as cache file to be sure about the result
# not using option '-o value' to be compatible with older version of blkid
FSTYPE=$("$BLKID" -c "$NULL" -s TYPE "$VOLUME") || error "Cannot get FSTYPE of \"$VOLUME\""
FSTYPE=${FSTYPE##*TYPE=\"} # cut quotation marks
FSTYPE=${FSTYPE%%\"*}
verbose "\"$FSTYPE\" filesystem found on \"$VOLUME\""
}
detect_mounted_with_proc_self_mountinfo() {
MOUNTED=$("$GREP" "^[0-9]* [0-9]* $MAJORMINOR " "$PROCSELFMOUNTINFO")
# extract 5th field which is mount point
# echo -e translates \040 to spaces
MOUNTED=$(echo ${MOUNTED} | cut -d " " -f 5)
MOUNTED=$(echo -n -e ${MOUNTED})
test -n "$MOUNTED"
}
detect_mounted_with_proc_mounts() {
MOUNTED=$("$GREP" "^$VOLUME[ \t]" "$PROCMOUNTS")
# for empty string try again with real volume name
test -z "$MOUNTED" && MOUNTED=$("$GREP" "^$RVOLUME[ \t]" "$PROCMOUNTS")
# cut device name prefix and trim everything past mountpoint
# echo translates \040 to spaces
MOUNTED=${MOUNTED#* }
MOUNTED=$(echo -n -e ${MOUNTED%% *})
# for systems with different device names - check also mount output
if test -z "$MOUNTED" ; then
MOUNTED=$(LC_ALL=C "$MOUNT" | "$GREP" "^$VOLUME[ \t]")
test -z "$MOUNTED" && MOUNTED=$(LC_ALL=C "$MOUNT" | "$GREP" "^$RVOLUME[ \t]")
MOUNTED=${MOUNTED##* on }
MOUNTED=${MOUNTED% type *} # allow type in the mount name
fi
test -n "$MOUNTED"
}
# check if the given device is already mounted and where
# FIXME: resolve swap usage and device stacking
detect_mounted() {
if test -e "$PROCSELFMOUNTINFO"; then
detect_mounted_with_proc_self_mountinfo
elif test -e "$PROCMOUNTS"; then
detect_mounted_with_proc_mounts
else
error "Cannot detect mounted device \"$VOLUME\""
fi
}
# get the full size of device in bytes
detect_device_size() {
# check if blockdev supports getsize64
"$BLOCKDEV" 2>&1 | "$GREP" getsize64 >"$NULL"
if test $? -eq 0; then
DEVSIZE=$("$BLOCKDEV" --getsize64 "$VOLUME") || error "Cannot read size of device \"$VOLUME\""
else
DEVSIZE=$("$BLOCKDEV" --getsize "$VOLUME") || error "Cannot read size of device \"$VOLUME\""
SSSIZE=$("$BLOCKDEV" --getss "$VOLUME") || error "Cannot block size read device \"$VOLUME\""
DEVSIZE=$(($DEVSIZE * $SSSIZE))
fi
}
# round up $1 / $2
# could be needed to gaurantee 'at least given size'
# but it makes many troubles
round_up_block_size() {
echo $(( ($1 + $2 - 1) / $2 ))
}
temp_mount() {
dry "$MKDIR" -p -m 0000 "$TEMPDIR" || error "Failed to create $TEMPDIR"
dry "$MOUNT" "$VOLUME" "$TEMPDIR" || error "Failed to mount $TEMPDIR"
}
temp_umount() {
dry "$UMOUNT" "$TEMPDIR" || error "Failed to umount \"$TEMPDIR\""
dry "$RMDIR" "${TEMPDIR}" || error "Failed to remove \"$TEMPDIR\""
dry "$RMDIR" "${TEMPDIR%%m}" || error "Failed to remove \"${TEMPDIR%%m}\""
}
yes_no() {
echo -n "$@? [Y|n] "
if [ -n "$YES" ]; then
echo y ; return 0
fi
while read -r -s -n 1 ANS ; do
case "$ANS" in
"y" | "Y" | "") echo y ; return 0 ;;
"n" | "N") echo n ; return 1 ;;
esac
done
}
try_umount() {
yes_no "Do you want to unmount \"$MOUNTED\"" && dry "$UMOUNT" "$MOUNTED" && return 0
error "Cannot proceed with mounted filesystem \"$MOUNTED\""
}
validate_parsing() {
test -n "$BLOCKSIZE" && test -n "$BLOCKCOUNT" || error "Cannot parse $1 output"
}
####################################
# Resize ext2/ext3/ext4 filesystem
# - unmounted or mounted for upsize
# - unmounted for downsize
####################################
resize_ext() {
verbose "Parsing $TUNE_EXT -l \"$VOLUME\""
for i in $(LC_ALL=C "$TUNE_EXT" -l "$VOLUME"); do
case "$i" in
"Block size"*) BLOCKSIZE=${i##* } ;;
"Block count"*) BLOCKCOUNT=${i##* } ;;
esac
done
validate_parsing "$TUNE_EXT"
decode_size $1 $BLOCKSIZE
FSFORCE=$FORCE
if [ "$NEWBLOCKCOUNT" -lt "$BLOCKCOUNT" -o "$EXTOFF" -eq 1 ]; then
detect_mounted && verbose "$RESIZE_EXT needs unmounted filesystem" && try_umount
REMOUNT=$MOUNTED
if test -n "$MOUNTED" ; then
# Forced fsck -f for umounted extX filesystem.
case "$-" in
*i*) dry "$FSCK" $YES -f "$VOLUME" ;;
*) dry "$FSCK" -f -p "$VOLUME" ;;
esac
fi
fi
verbose "Resizing filesystem on device \"$VOLUME\" to $NEWSIZE bytes ($BLOCKCOUNT -> $NEWBLOCKCOUNT blocks of $BLOCKSIZE bytes)"
dry "$RESIZE_EXT" $FSFORCE "$VOLUME" $NEWBLOCKCOUNT
}
#############################
# Resize reiserfs filesystem
# - unmounted for upsize
# - unmounted for downsize
#############################
resize_reiser() {
detect_mounted && verbose "ReiserFS resizes only unmounted filesystem" && try_umount
REMOUNT=$MOUNTED
verbose "Parsing $TUNE_REISER \"$VOLUME\""
for i in $(LC_ALL=C "$TUNE_REISER" "$VOLUME"); do
case "$i" in
"Blocksize"*) BLOCKSIZE=${i##*: } ;;
"Count of blocks"*) BLOCKCOUNT=${i##*: } ;;
esac
done
validate_parsing "$TUNE_REISER"
decode_size $1 $BLOCKSIZE
verbose "Resizing \"$VOLUME\" $BLOCKCOUNT -> $NEWBLOCKCOUNT blocks ($NEWSIZE bytes, bs: $NEWBLOCKCOUNT)"
if [ -n "$YES" ]; then
echo y | dry "$RESIZE_REISER" -s $NEWSIZE "$VOLUME"
else
dry "$RESIZE_REISER" -s $NEWSIZE "$VOLUME"
fi
}
########################
# Resize XFS filesystem
# - mounted for upsize
# - cannot downsize
########################
resize_xfs() {
detect_mounted
MOUNTPOINT=$MOUNTED
if [ -z "$MOUNTED" ]; then
MOUNTPOINT=$TEMPDIR
temp_mount || error "Cannot mount Xfs filesystem"
fi
verbose "Parsing $TUNE_XFS \"$MOUNTPOINT\""
for i in $(LC_ALL=C "$TUNE_XFS" "$MOUNTPOINT"); do
case "$i" in
"data"*) BLOCKSIZE=${i##*bsize=} ; BLOCKCOUNT=${i##*blocks=} ;;
esac
done
BLOCKSIZE=${BLOCKSIZE%%[^0-9]*}
BLOCKCOUNT=${BLOCKCOUNT%%[^0-9]*}
validate_parsing "$TUNE_XFS"
decode_size $1 $BLOCKSIZE
if [ $NEWBLOCKCOUNT -gt $BLOCKCOUNT ]; then
verbose "Resizing Xfs mounted on \"$MOUNTPOINT\" to fill device \"$VOLUME\""
dry "$RESIZE_XFS" $MOUNTPOINT
elif [ $NEWBLOCKCOUNT -eq $BLOCKCOUNT ]; then
verbose "Xfs filesystem already has the right size"
else
error "Xfs filesystem shrinking is unsupported"
fi
}
####################
# Resize filesystem
####################
resize() {
NEWSIZE=$2
detect_fs "$1"
detect_device_size
verbose "Device \"$VOLUME\" size is $DEVSIZE bytes"
# if the size parameter is missing use device size
#if [ -n "$NEWSIZE" -a $NEWSIZE <
test -z "$NEWSIZE" && NEWSIZE=${DEVSIZE}b
IFS=$NL
case "$FSTYPE" in
"ext3"|"ext2"|"ext4") resize_ext $NEWSIZE ;;
"reiserfs") resize_reiser $NEWSIZE ;;
"xfs") resize_xfs $NEWSIZE ;;
*) error "Filesystem \"$FSTYPE\" on device \"$VOLUME\" is not supported by this tool" ;;
esac || error "Resize $FSTYPE failed"
cleanup 0
}
####################################
# Calclulate diff between two dates
# LC_ALL=C input is expected the
# only one supported
####################################
diff_dates() {
echo $(( $("$DATE" -u -d"$1" +%s 2>"$NULL") - $("$DATE" -u -d"$2" +%s 2>"$NULL") ))
}
###################
# Check filesystem
###################
check() {
detect_fs "$1"
if detect_mounted ; then
verbose "Skipping filesystem check for device \"$VOLUME\" as the filesystem is mounted on $MOUNTED";
cleanup 3
fi
case "$FSTYPE" in
"ext2"|"ext3"|"ext4")
IFS_CHECK=$IFS
IFS=$NL
for i in $(LC_ALL=C "$TUNE_EXT" -l "$VOLUME"); do
case "$i" in
"Last mount"*) LASTMOUNT=${i##*: } ;;
"Last checked"*) LASTCHECKED=${i##*: } ;;
esac
done
case "$LASTMOUNT" in
*"n/a") ;; # nothing to do - system was not mounted yet
*)
LASTDIFF=$(diff_dates $LASTMOUNT $LASTCHECKED)
if test "$LASTDIFF" -gt 0 ; then
verbose "Filesystem has not been checked after the last mount, using fsck -f"
FORCE="-f"
fi
;;
esac
IFS=$IFS_CHECK
esac
case "$FSTYPE" in
"xfs") if which "$XFS_CHECK" >"$NULL" 2>&1 ; then
dry "$XFS_CHECK" "$VOLUME"
else
# Replacement for outdated xfs_check
# FIXME: for small devices we need to force_geometry,
# since we run in '-n' mode, it shouldn't be problem.
# Think about better way....
dry "$XFS_REPAIR" -n -o force_geometry "$VOLUME"
fi ;;
*) # check if executed from interactive shell environment
case "$-" in
*i*) dry "$FSCK" $YES $FORCE "$VOLUME" ;;
*) dry "$FSCK" $FORCE -p "$VOLUME" ;;
esac
esac
}
#############################
# start point of this script
# - parsing parameters
#############################
trap "cleanup 2" 2
# test if we are not invoked recursively
test -n "$FSADM_RUNNING" && exit 0
# test some prerequisities
for i in "$TUNE_EXT" "$RESIZE_EXT" "$TUNE_REISER" "$RESIZE_REISER" \
"$TUNE_XFS" "$RESIZE_XFS" "$MOUNT" "$UMOUNT" "$MKDIR" \
"$RMDIR" "$BLOCKDEV" "$BLKID" "$GREP" "$READLINK" \
"$DATE" "$FSCK" "$XFS_CHECK" "$XFS_REPAIR" "$LVM" ; do
test -n "$i" || error "Required command definitions in the script are missing!"
done
"$LVM" version >"$NULL" 2>&1 || error "Could not run lvm binary \"$LVM\""
$("$READLINK" -e / >"$NULL" 2>&1) || READLINK_E="-f"
TEST64BIT=$(( 1000 * 1000000000000 ))
test "$TEST64BIT" -eq 1000000000000000 || error "Shell does not handle 64bit arithmetic"
$(echo Y | "$GREP" Y >"$NULL") || error "Grep does not work properly"
test $("$DATE" -u -d"Jan 01 00:00:01 1970" +%s) -eq 1 || error "Date translation does not work"
if [ "$#" -eq 0 ] ; then
tool_usage
fi
while [ "$#" -ne 0 ]
do
case "$1" in
"") ;;
"-h"|"--help") tool_usage ;;
"-v"|"--verbose") VERB="-v" ;;
"-n"|"--dry-run") DRY=1 ;;
"-f"|"--force") FORCE="-f" ;;
"-e"|"--ext-offline") EXTOFF=1 ;;
"-y"|"--yes") YES="-y" ;;
"-l"|"--lvresize") DO_LVRESIZE=1 ;;
"check") CHECK="$2" ; shift ;;
"resize") RESIZE="$2"; NEWSIZE="$3" ; shift 2 ;;
*) error "Wrong argument \"$1\". (see: $TOOL --help)"
esac
shift
done
test "$YES" = "-y" || YES=
test "$EXTOFF" -eq 1 || EXTOFF=0
if [ -n "$CHECK" ]; then
check "$CHECK"
elif [ -n "$RESIZE" ]; then
export FSADM_RUNNING="fsadm"
resize "$RESIZE" "$NEWSIZE"
else
error "Missing command. (see: $TOOL --help)"
fi