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git://sourceware.org/git/lvm2.git
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407 lines
11 KiB
Bash
407 lines
11 KiB
Bash
#!/bin/bash
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#
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# Copyright (C) 2007-2009 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: Zdenek Kabelac <zkabelac at redhat.com>
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#
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# Script for resizing devices (usable for LVM resize)
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#
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# Needed utilities:
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# mount, umount, grep, readlink, blockdev, blkid, fsck, xfs_check
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#
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# ext2/ext3/ext4: resize2fs, tune2fs
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# reiserfs: resize_reiserfs, reiserfstune
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# xfs: xfs_growfs, xfs_info
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#
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TOOL=fsadm
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PATH=/sbin:/usr/sbin:/bin:/usr/sbin:$PATH
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# utilities
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TUNE_EXT=tune2fs
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RESIZE_EXT=resize2fs
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TUNE_REISER=reiserfstune
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RESIZE_REISER=resize_reiserfs
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TUNE_XFS=xfs_info
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RESIZE_XFS=xfs_growfs
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MOUNT=mount
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UMOUNT=umount
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MKDIR=mkdir
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RMDIR=rmdir
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BLOCKDEV=blockdev
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BLKID=blkid
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GREP=grep
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READLINK=readlink
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READLINK_E="-e"
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FSCK=fsck
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XFS_CHECK=xfs_check
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# user may override lvm location by setting LVM_BINARY
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LVM=${LVM_BINARY-lvm}
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YES=
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DRY=0
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VERB=
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FORCE=
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EXTOFF=0
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DO_LVRESIZE=0
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FSTYPE=unknown
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VOLUME=unknown
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TEMPDIR="${TMPDIR:-/tmp}/${TOOL}_${RANDOM}$$/m"
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BLOCKSIZE=
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BLOCKCOUNT=
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MOUNTPOINT=
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MOUNTED=
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REMOUNT=
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IFS_OLD=$IFS
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# without bash $'\n'
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NL='
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'
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tool_usage() {
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echo "${TOOL}: Utility to resize or check the filesystem on a device"
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echo
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echo " ${TOOL} [options] check device"
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echo " - Check the filesystem on device using fsck"
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echo
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echo " ${TOOL} [options] resize device [new_size[BKMGTPE]]"
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echo " - Change the size of the filesystem on device to new_size"
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echo
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echo " Options:"
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echo " -h | --help Show this help message"
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echo " -v | --verbose Be verbose"
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echo " -e | --ext-offline unmount filesystem before ext2/ext3/ext4 resize"
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echo " -f | --force Bypass sanity checks"
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echo " -n | --dry-run Print commands without running them"
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echo " -l | --lvresize Resize given device (if it is LVM device)"
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echo " -y | --yes Answer \"yes\" at any prompts"
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echo
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echo " new_size - Absolute number of filesystem blocks to be in the filesystem,"
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echo " or an absolute size using a suffix (in powers of 1024)."
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echo " If new_size is not supplied, the whole device is used."
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exit
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}
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verbose() {
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test -n "$VERB" && echo "$TOOL: $@" || true
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}
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error() {
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echo "$TOOL: $@" >&2
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cleanup 1
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}
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dry() {
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if [ "$DRY" -ne 0 ]; then
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verbose "Dry execution $@"
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return 0
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fi
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verbose "Executing $@"
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$@
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}
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cleanup() {
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trap '' 2
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# reset MOUNTPOINT - avoid recursion
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test "$MOUNTPOINT" = "$TEMPDIR" && MOUNTPOINT="" temp_umount
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if [ -n "$REMOUNT" ]; then
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verbose "Remounting unmounted filesystem back"
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dry $MOUNT "$VOLUME" "$MOUNTED"
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fi
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IFS=$IFS_OLD
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trap 2
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# start LVRESIZE with the filesystem modification flag
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# and allow recursive call of fsadm
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unset FSADM_RUNNING
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test "$DO_LVRESIZE" -eq 2 && exec $LVM lvresize $VERB -r -L$(( $NEWSIZE / 1048576 )) $VOLUME
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exit ${1:-0}
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}
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# convert parameter from Exa/Peta/Tera/Giga/Mega/Kilo/Bytes and blocks
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# (2^(60/50/40/30/20/10/0))
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decode_size() {
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case "$1" in
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*[eE]) NEWSIZE=$(( ${1%[eE]} * 1152921504606846976 )) ;;
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*[pP]) NEWSIZE=$(( ${1%[pP]} * 1125899906842624 )) ;;
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*[tT]) NEWSIZE=$(( ${1%[tT]} * 1099511627776 )) ;;
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*[gG]) NEWSIZE=$(( ${1%[gG]} * 1073741824 )) ;;
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*[mM]) NEWSIZE=$(( ${1%[mM]} * 1048576 )) ;;
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*[kK]) NEWSIZE=$(( ${1%[kK]} * 1024 )) ;;
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*[bB]) NEWSIZE=${1%[bB]} ;;
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*) NEWSIZE=$(( $1 * $2 )) ;;
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esac
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#NEWBLOCKCOUNT=$(round_block_size $NEWSIZE $2)
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NEWBLOCKCOUNT=$(( $NEWSIZE / $2 ))
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if [ $DO_LVRESIZE -eq 1 ]; then
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# start lvresize, but first cleanup mounted dirs
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DO_LVRESIZE=2
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cleanup 0
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fi
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}
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# detect filesystem on the given device
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# dereference device name if it is symbolic link
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detect_fs() {
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VOLUME=${1#/dev/}
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VOLUME=$($READLINK $READLINK_E "/dev/$VOLUME") || error "Cannot get readlink $1"
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# strip newline from volume name
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VOLUME=${VOLUME%%$NL}
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# use /dev/null as cache file to be sure about the result
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# not using option '-o value' to be compatible with older version of blkid
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FSTYPE=$($BLKID -c /dev/null -s TYPE "$VOLUME") || error "Cannot get FSTYPE of \"$VOLUME\""
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FSTYPE=${FSTYPE##*TYPE=\"} # cut quotation marks
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FSTYPE=${FSTYPE%%\"*}
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verbose "\"$FSTYPE\" filesystem found on \"$VOLUME\""
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}
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# check if the given device is already mounted and where
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detect_mounted() {
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$MOUNT >/dev/null || error "Cannot detect mounted device $VOLUME"
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MOUNTED=$($MOUNT | $GREP "$VOLUME")
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MOUNTED=${MOUNTED##* on }
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MOUNTED=${MOUNTED% type *} # allow type in the mount name
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test -n "$MOUNTED"
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}
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# get the full size of device in bytes
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detect_device_size() {
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# check if blockdev supports getsize64
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$BLOCKDEV 2>&1 | $GREP getsize64 >/dev/null
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if test $? -eq 0; then
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DEVSIZE=$($BLOCKDEV --getsize64 "$VOLUME") || error "Cannot read size of device \"$VOLUME\""
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else
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DEVSIZE=$($BLOCKDEV --getsize "$VOLUME") || error "Cannot read size of device \"$VOLUME\""
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SSSIZE=$($BLOCKDEV --getss "$VOLUME") || error "Cannot block size read device \"$VOLUME\""
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DEVSIZE=$(($DEVSIZE * $SSSIZE))
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fi
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}
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# round up $1 / $2
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# could be needed to gaurantee 'at least given size'
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# but it makes many troubles
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round_up_block_size() {
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echo $(( ($1 + $2 - 1) / $2 ))
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}
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temp_mount() {
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dry $MKDIR -p -m 0000 "$TEMPDIR" || error "Failed to create $TEMPDIR"
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dry $MOUNT "$VOLUME" "$TEMPDIR" || error "Failed to mount $TEMPDIR"
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}
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temp_umount() {
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dry $UMOUNT "$TEMPDIR" || error "Failed to umount $TEMPDIR"
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dry $RMDIR "${TEMPDIR}" || error "Failed to remove $TEMPDIR"
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dry $RMDIR "${TEMPDIR%%m}" || error "Failed to remove ${TEMPDIR%%m}"
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}
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yes_no() {
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echo -n "$@? [Y|n] "
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if [ -n "$YES" ]; then
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echo y ; return 0
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fi
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while read -r -s -n 1 ANS ; do
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case "$ANS" in
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"y" | "Y" | "") echo y ; return 0 ;;
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"n" | "N") echo n ; return 1 ;;
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esac
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done
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}
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try_umount() {
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yes_no "Do you want to unmount \"$MOUNTED\"" && dry $UMOUNT "$MOUNTED" && return 0
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error "Can not proceed with mounted filesystem \"$MOUNTED\""
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}
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validate_parsing() {
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test -n "$BLOCKSIZE" -a -n "$BLOCKCOUNT" || error "Cannot parse $1 output"
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}
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####################################
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# Resize ext2/ext3/ext4 filesystem
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# - unmounted or mounted for upsize
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# - unmounted for downsize
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####################################
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resize_ext() {
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verbose "Parsing $TUNE_EXT -l \"$VOLUME\""
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for i in $($TUNE_EXT -l "$VOLUME"); do
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case "$i" in
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"Block size"*) BLOCKSIZE=${i##* } ;;
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"Block count"*) BLOCKCOUNT=${i##* } ;;
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esac
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done
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validate_parsing $TUNE_EXT
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decode_size $1 $BLOCKSIZE
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FSFORCE=$FORCE
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if [ "$NEWBLOCKCOUNT" -lt "$BLOCKCOUNT" -o "$EXTOFF" -eq 1 ]; then
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detect_mounted && verbose "$RESIZE_EXT needs unmounted filesystem" && try_umount
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REMOUNT=$MOUNTED
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# CHECKME: after umount resize2fs requires fsck or -f flag.
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FSFORCE="-f"
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fi
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verbose "Resizing filesystem on device \"$VOLUME\" to $NEWSIZE bytes ($BLOCKCOUNT -> $NEWBLOCKCOUNT blocks of $BLOCKSIZE bytes)"
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dry $RESIZE_EXT $FSFORCE "$VOLUME" $NEWBLOCKCOUNT
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}
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#############################
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# Resize reiserfs filesystem
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# - unmounted for upsize
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# - unmounted for downsize
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#############################
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resize_reiser() {
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detect_mounted && verbose "ReiserFS resizes only unmounted filesystem" && try_umount
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REMOUNT=$MOUNTED
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verbose "Parsing $TUNE_REISER \"$VOLUME\""
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for i in $($TUNE_REISER "$VOLUME"); do
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case "$i" in
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"Blocksize"*) BLOCKSIZE=${i##*: } ;;
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"Count of blocks"*) BLOCKCOUNT=${i##*: } ;;
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esac
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done
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validate_parsing $TUNE_REISER
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decode_size $1 $BLOCKSIZE
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verbose "Resizing \"$VOLUME\" $BLOCKCOUNT -> $NEWBLOCKCOUNT blocks ($NEWSIZE bytes, bs: $NEWBLOCKCOUNT)"
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if [ -n "$YES" ]; then
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dry echo y | $RESIZE_REISER -s $NEWSIZE "$VOLUME"
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else
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dry $RESIZE_REISER -s $NEWSIZE "$VOLUME"
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fi
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}
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########################
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# Resize XFS filesystem
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# - mounted for upsize
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# - can not downsize
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########################
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resize_xfs() {
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detect_mounted
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MOUNTPOINT=$MOUNTED
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if [ -z "$MOUNTED" ]; then
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MOUNTPOINT=$TEMPDIR
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temp_mount || error "Cannot mount Xfs filesystem"
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fi
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verbose "Parsing $TUNE_XFS \"$MOUNTPOINT\""
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for i in $($TUNE_XFS "$MOUNTPOINT"); do
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case "$i" in
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"data"*) BLOCKSIZE=${i##*bsize=} ; BLOCKCOUNT=${i##*blocks=} ;;
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esac
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done
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BLOCKSIZE=${BLOCKSIZE%%[^0-9]*}
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BLOCKCOUNT=${BLOCKCOUNT%%[^0-9]*}
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validate_parsing $TUNE_XFS
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decode_size $1 $BLOCKSIZE
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if [ $NEWBLOCKCOUNT -gt $BLOCKCOUNT ]; then
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verbose "Resizing Xfs mounted on \"$MOUNTPOINT\" to fill device \"$VOLUME\""
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dry $RESIZE_XFS $MOUNTPOINT
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elif [ $NEWBLOCKCOUNT -eq $BLOCKCOUNT ]; then
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verbose "Xfs filesystem already has the right size"
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else
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error "Xfs filesystem shrinking is unsupported"
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fi
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}
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####################
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# Resize filesystem
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####################
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resize() {
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NEWSIZE=$2
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detect_fs "$1"
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detect_device_size
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verbose "Device \"$VOLUME\" size is $DEVSIZE bytes"
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# if the size parameter is missing use device size
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#if [ -n "$NEWSIZE" -a $NEWSIZE <
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test -z "$NEWSIZE" && NEWSIZE=${DEVSIZE}b
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trap cleanup 2
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IFS=$NL
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case "$FSTYPE" in
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"ext3"|"ext2"|"ext4") resize_ext $NEWSIZE ;;
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"reiserfs") resize_reiser $NEWSIZE ;;
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"xfs") resize_xfs $NEWSIZE ;;
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*) error "Filesystem \"$FSTYPE\" on device \"$VOLUME\" is not supported by this tool" ;;
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esac || error "Resize $FSTYPE failed"
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cleanup 0
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}
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###################
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# Check filesystem
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###################
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check() {
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detect_fs "$1"
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detect_mounted && error "Can not fsck device \"$VOLUME\", filesystem mounted on $MOUNTED"
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case "$FSTYPE" in
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"xfs") dry $XFS_CHECK "$VOLUME" ;;
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*) dry $FSCK $YES "$VOLUME" ;;
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esac
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}
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#############################
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# start point of this script
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# - parsing parameters
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#############################
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# test if we are not invoked recursively
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test -n "$FSADM_RUNNING" && exit 0
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# test some prerequisities
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test -n "$TUNE_EXT" -a -n "$RESIZE_EXT" -a -n "$TUNE_REISER" -a -n "$RESIZE_REISER" \
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-a -n "$TUNE_XFS" -a -n "$RESIZE_XFS" -a -n "$MOUNT" -a -n "$UMOUNT" -a -n "$MKDIR" \
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-a -n "$RMDIR" -a -n "$BLOCKDEV" -a -n "$BLKID" -a -n "$GREP" -a -n "$READLINK" \
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-a -n "$FSCK" -a -n "$XFS_CHECK" -a -n "LVM" \
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|| error "Required command definitions in the script are missing!"
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$LVM version >/dev/null 2>&1 || error "Could not run lvm binary '$LVM'"
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$($READLINK -e / >/dev/null 2>&1) || READLINK_E="-f"
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TEST64BIT=$(( 1000 * 1000000000000 ))
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test $TEST64BIT -eq 1000000000000000 || error "Shell does not handle 64bit arithmetic"
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$(echo Y | $GREP Y >/dev/null) || error "Grep does not work properly"
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if [ "$#" -eq 0 ] ; then
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tool_usage
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fi
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while [ "$#" -ne 0 ]
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do
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case "$1" in
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"") ;;
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"-h"|"--help") tool_usage ;;
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"-v"|"--verbose") VERB="-v" ;;
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"-n"|"--dry-run") DRY=1 ;;
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"-f"|"--force") FORCE="-f" ;;
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"-e"|"--ext-offline") EXTOFF=1 ;;
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"-y"|"--yes") YES="-y" ;;
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"-l"|"--lvresize") DO_LVRESIZE=1 ;;
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"check") CHECK="$2" ; shift ;;
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"resize") RESIZE="$2"; NEWSIZE="$3" ; shift 2 ;;
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*) error "Wrong argument \"$1\". (see: $TOOL --help)"
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esac
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shift
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done
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if [ -n "$CHECK" ]; then
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check "$CHECK"
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elif [ -n "$RESIZE" ]; then
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export FSADM_RUNNING="fsadm"
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resize "$RESIZE" "$NEWSIZE"
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else
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error "Missing command. (see: $TOOL --help)"
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fi
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