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lvm2/scripts/fsadm.sh
Alasdair Kergon 04ed52f6a0 pre-release (bug fixes only - enhancements excluded)
2008-04-29 15:58:25 +00:00

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#!/bin/sh
#
# Copyright (C) 2007 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: 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: resize2fs, tune2fs
# reiserfs: resize_reiserfs, reiserfstune
# xfs: xfs_growfs, xfs_info
#
TOOL=fsadm
PATH=/sbin:/usr/sbin:/bin:/usr/sbin:$PATH
# utilities
TUNE_EXT=tune2fs
RESIZE_EXT=resize2fs
TUNE_REISER=reiserfstune
RESIZE_REISER=resize_reiserfs
TUNE_XFS=xfs_info
RESIZE_XFS=xfs_growfs
MOUNT=mount
UMOUNT=umount
MKDIR=mkdir
RMDIR=rmdir
BLOCKDEV=blockdev
BLKID=blkid
GREP=grep
CUT=cut
READLINK=readlink
READLINK_E="-e"
FSCK=fsck
XFS_CHECK=xfs_check
LVRESIZE=lvresize
YES=
DRY=0
VERB=
FORCE=
EXTOFF=0
DO_LVRESIZE=0
FSTYPE=unknown
VOLUME=unknown
TEMPDIR="${TMPDIR:-/tmp}/${TOOL}_${RANDOM}$$/m"
BLOCKSIZE=
BLOCKCOUNT=
MOUNTPOINT=
MOUNTED=
REMOUNT=
IFS_OLD=$IFS
tool_usage() {
echo "${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 " ${TOOL} [options] resize device [new_size[BKMGTPE]]"
echo " - Change the size of the filesystem on device to new_size"
echo
echo " Options:"
echo " -h | --help Show this help message"
echo " -v | --verbose Be verbose"
echo " -e | --ext-offline unmount filesystem before Ext2/3 resize"
echo " -f | --force Bypass sanity checks"
echo " -n | --dry-run Print commands without running them"
echo " -l | --lvresize Resize given device (if it is LVM device)"
echo " -y | --yes Answer \"yes\" at any prompts"
echo
echo " new_size - Absolute number of filesystem blocks to be in the filesystem,"
echo " or an absolute size using a suffix (in powers of 1024)."
echo " If new_size is not supplied, the whole device is used."
exit
}
verbose() {
test -n "$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
# start LVRESIZE with the filesystem modification flag
# and allow recursive call of fsadm
unset FSADM_RUNNING
test "$DO_LVRESIZE" -eq 2 && exec $LVRESIZE $VERB -r -L$(( $NEWSIZE / 1048576 )) $VOLUME
exit ${1:-0}
}
# 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 [ $DO_LVRESIZE -eq 1 ]; then
# start lvresize, but first cleanup mounted dirs
DO_LVRESIZE=2
cleanup 0
fi
}
# detect filesystem on the given device
# dereference device name if it is symbolic link
detect_fs() {
VOLUME=${1#/dev/}
VOLUME=$($READLINK $READLINK_E -n "/dev/$VOLUME") || error "Cannot get readlink $1"
# use /dev/null as cache file to be sure about the result
# use 'cut' to be compatible with older version of blkid that does not provide option '-o value'
FSTYPE=$($BLKID -c /dev/null -s TYPE "$VOLUME" | $CUT -d \" -f 2) || error "Cannot get FSTYPE of \"$VOLUME\""
verbose "\"$FSTYPE\" filesystem found on \"$VOLUME\""
}
# check if the given device is already mounted and where
detect_mounted() {
$MOUNT >/dev/null || error "Cannot detect mounted device $VOLUME"
MOUNTED=$($MOUNT | $GREP "$VOLUME")
MOUNTED=${MOUNTED##* on }
MOUNTED=${MOUNTED% type *} # allow type in the mount name
test -n "$MOUNTED"
}
# get the full size of device in bytes
detect_device_size() {
# check if blockdev supports getsize64
$BLOCKDEV 2>&1 | $GREP getsize64 >/dev/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
ANS="y"; echo -n $ANS
else
read -n 1 ANS
fi
test -n "$ANS" && echo
case "$ANS" in
"y" | "Y" | "" ) return 0 ;;
esac
return 1
}
try_umount() {
yes_no "Do you want to unmount \"$MOUNTED\"" && dry $UMOUNT "$MOUNTED" && return 0
error "Cannot proceed test with mounted filesystem \"$MOUNTED\""
}
validate_parsing() {
test -n "$BLOCKSIZE" -a -n "$BLOCKCOUNT" || error "Cannot parse $1 output"
}
####################################
# Resize ext2/ext3 filesystem
# - unmounted or mounted for upsize
# - unmounted for downsize
####################################
resize_ext() {
verbose "Parsing $TUNE_EXT -l \"$VOLUME\""
for i in $($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=$MOUNTED
# CHECKME: after umount resize2fs requires fsck or -f flag.
FSFORCE="-f"
fi
verbose "Resizing \"$VOLUME\" $BLOCKCOUNT -> $NEWBLOCKCOUNT blocks ($NEWSIZE bytes, bs:$BLOCKSIZE)"
dry $RESIZE_EXT $FSFORCE "$VOLUME" $NEWBLOCKCOUNT
}
#############################
# Resize reiserfs filesystem
# - unmounted for upsize
# - unmounted for downsize
#############################
resize_reiser() {
detect_mounted
if [ -n "$MOUNTED" ]; then
verbose "ReiserFS resizes only unmounted filesystem"
try_umount
REMOUNT=$MOUNTED
fi
verbose "Parsing $TUNE_REISER \"$VOLUME\""
for i in $($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
dry echo y | $RESIZE_REISER -s $NEWSIZE "$VOLUME"
else
dry $RESIZE_REISER -s $NEWSIZE "$VOLUME"
fi
}
########################
# Resize XFS filesystem
# - mounted for upsize
# - can not 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 $($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\" has $DEVSIZE bytes"
# if the size parameter is missing use device size
#if [ -n "$NEWSIZE" -a $NEWSIZE <
test -z "$NEWSIZE" && NEWSIZE=${DEVSIZE}b
trap cleanup 2
#IFS=$'\n' # don't use bash-ism ??
IFS="$(printf \"\\n\")" # needed for parsing output
case "$FSTYPE" in
"ext3"|"ext2") 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
}
###################
# Check filesystem
###################
check() {
detect_fs "$1"
case "$FSTYPE" in
"xfs") dry $XFS_CHECK "$VOLUME" ;;
*) dry $FSCK $YES "$VOLUME" ;;
esac
}
#############################
# start point of this script
# - parsing parameters
#############################
# test if we are not invoked recursively
test -n "$FSADM_RUNNING" && exit 0
# test some prerequisities
test -n "$TUNE_EXT" -a -n "$RESIZE_EXT" -a -n "$TUNE_REISER" -a -n "$RESIZE_REISER" \
-a -n "$TUNE_XFS" -a -n "$RESIZE_XFS" -a -n "$MOUNT" -a -n "$UMOUNT" -a -n "$MKDIR" \
-a -n "$RMDIR" -a -n "$BLOCKDEV" -a -n "$BLKID" -a -n "$GREP" -a -n "$READLINK" \
-a -n "$FSCK" -a -n "$XFS_CHECK" -a -n "LVRESIZE" -a -n "$CUT" \
|| error "Required command definitions in the script are missing!"
$($READLINK -e -n / >/dev/null 2>&1) || READLINK_E="-f"
TEST64BIT=$(( 1000 * 1000000000000 ))
test $TEST64BIT -eq 1000000000000000 || error "Shell does not handle 64bit arithmetic"
$(echo Y | $GREP Y >/dev/null) || error "Grep does not work properly"
if [ "$1" = "" ] ; then
tool_usage
fi
while [ "$1" != "" ]
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") shift; CHECK=$1 ;;
"resize") shift; RESIZE=$1; shift; NEWSIZE=$1 ;;
*) error "Wrong argument \"$1\". (see: $TOOL --help)"
esac
shift
done
if [ -n "$CHECK" ]; then
check "$CHECK"
elif [ -n "$RESIZE" ]; then
export FSADM_RUNNING="fsadm"
resize "$RESIZE" "$NEWSIZE"
else
error "Missing command. (see: $TOOL --help)"
fi
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