##/bin/bash
#-----------------------------------------------------------------------
#  Copyright (c) 2000-2006 Silicon Graphics, Inc.  All Rights Reserved.
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  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
#
#  Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane,
#  Mountain View, CA 94043, USA, or: http://www.sgi.com
#-----------------------------------------------------------------------

BC=$(which bc 2> /dev/null) || BC=

# Valid test names start with 3 digits "NNN":
#  "[0-9]\{3\}"
# followed by an optional "-":
#  "-\?"
# followed by an optional combination of alphanumeric and "-" chars:
#  "[[:alnum:]-]*"
# e.g. 999-the-mark-of-fstests
#
VALID_TEST_ID="[0-9]\{3\}"
VALID_TEST_NAME="$VALID_TEST_ID-\?[[:alnum:]-]*"

_require_math()
{
	if [ -z "$BC" ]; then
		_notrun "this test requires 'bc' tool for doing math operations"
	fi
}

_math()
{
	[ $# -le 0 ] && return
	if [ "$BC" ]; then
		result=$(LANG=C echo "scale=0; $@" | "$BC" -q 2> /dev/null)
	else
		_notrun "this test requires 'bc' tool for doing math operations"
	fi
	echo "$result"
}

dd()
{
   if [ "$HOSTOS" == "Linux" ]
   then	
	command dd --help 2>&1 | grep noxfer >/dev/null
	
	if [ "$?" -eq 0 ]
	    then
		command dd status=noxfer $@
	    else
		command dd $@
    	fi
   else
	command dd $@
   fi
}

_btrfs_get_subvolid()
{
	mnt=$1
	name=$2

	$BTRFS_UTIL_PROG sub list $mnt | grep $name | awk '{ print $2 }'
}

# Prints the md5 checksum of a given file
_md5_checksum()
{
	md5sum $1 | cut -d ' ' -f1
}

# Write a byte into a range of a file
_pwrite_byte() {
	pattern="$1"
	offset="$2"
	len="$3"
	file="$4"
	xfs_io_args="$5"

	"$XFS_IO_PROG" $xfs_io_args -f -c "pwrite -S $pattern $offset $len" "$file"
}

# mmap-write a byte into a range of a file
_mwrite_byte() {
	pattern="$1"
	offset="$2"
	len="$3"
	mmap_len="$4"
	file="$5"

	"$XFS_IO_PROG" -f -c "mmap -rw 0 $mmap_len" -c "mwrite -S $pattern $offset $len" "$file"
}

# ls -l w/ selinux sometimes puts a dot at the end:
# -rwxrw-r--. id1 id2 file1
# Also filter out lost+found directory on extN file system if present

_ls_l()
{
	ls -l $* | sed "s/\(^[-rwxdlbcpsStT]*\)\. /\1 /" | grep -v 'lost+found'
}

# we need common/config
if [ "$iam" != "check" ]
then
    if ! . ./common/config
        then
        echo "$iam: failed to source common/config"
        exit 1
    fi
fi

# check for correct setup
case "$FSTYP" in
    xfs)
	 [ "$XFS_LOGPRINT_PROG" = "" ] && _fatal "xfs_logprint not found"
	 [ "$XFS_REPAIR_PROG" = "" ] && _fatal "xfs_repair not found"
	 [ "$XFS_DB_PROG" = "" ] && _fatal "xfs_db not found"
	 [ "$MKFS_XFS_PROG" = "" ] && _fatal "mkfs_xfs not found"
	 ;;
    udf)
	 [ "$MKFS_UDF_PROG" = "" ] && _fatal "mkfs_udf/mkudffs not found"
	 ;;
    btrfs)
	 [ "$MKFS_BTRFS_PROG" = "" ] && _fatal "mkfs.btrfs not found"
	 ;;
    ext4)
	 [ "$MKFS_EXT4_PROG" = "" ] && _fatal "mkfs.ext4 not found"
	 ;;
    f2fs)
	 [ "$MKFS_F2FS_PROG" = "" ] && _fatal "mkfs.f2fs not found"
	 ;;
    nfs)
	 ;;
    cifs)
	 ;;
    overlay)
	 ;;
    reiser4)
	 [ "$MKFS_REISER4_PROG" = "" ] && _fatal "mkfs.reiser4 not found"
	 ;;
esac

# make sure we have a standard umask
umask 022

_mount()
{
    $MOUNT_PROG `_mount_ops_filter $*`
}

_scratch_options()
{
    type=$1
    SCRATCH_OPTIONS=""

    if [ "$FSTYP" != "xfs" ]; then
        return
    fi

    case $type in
    mkfs)
	[ "$HOSTOS" != "IRIX" ] && SCRATCH_OPTIONS="$SCRATCH_OPTIONS -f"
	rt_opt="-r"
        log_opt="-l"
	;;
    mount)
	rt_opt="-o"
        log_opt="-o"
	;;
    esac
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ] && \
	SCRATCH_OPTIONS="$SCRATCH_OPTIONS ${rt_opt}rtdev=$SCRATCH_RTDEV"
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
	SCRATCH_OPTIONS="$SCRATCH_OPTIONS ${log_opt}logdev=$SCRATCH_LOGDEV"
}

_test_options()
{
    type=$1
    TEST_OPTIONS=""

    if [ "$FSTYP" != "xfs" ]; then
        return
    fi

    case $type in
    mkfs)
	rt_opt="-r"
        log_opt="-l"
	;;
    mount)
	rt_opt="-o"
        log_opt="-o"
	;;
    esac
    [ "$USE_EXTERNAL" = yes -a ! -z "$TEST_RTDEV" ] && \
	TEST_OPTIONS="$TEST_OPTIONS ${rt_opt}rtdev=$TEST_RTDEV"
    [ "$USE_EXTERNAL" = yes -a ! -z "$TEST_LOGDEV" ] && \
	TEST_OPTIONS="$TEST_OPTIONS ${log_opt}logdev=$TEST_LOGDEV"
}

_mount_ops_filter()
{
    params="$*"
    
    #get mount point to handle dmapi mtpt option correctly
    let last_index=$#-1
    [ $last_index -gt 0 ] && shift $last_index
    FS_ESCAPED=$1
    
    # irix is fussy about how it is fed its mount options
    # - multiple -o's are not allowed
    # - no spaces between comma delimitered options
    # the sed script replaces all -o's (except the first) with a comma
    # not required for linux, but won't hurt
    
    echo $params | sed -e 's/[[:space:]]\+-o[[:space:]]*/UnIqUe/1; s/[[:space:]]\+-o[[:space:]]*/,/g; s/UnIqUe/ -o /1' \
        | sed -e 's/dmapi/dmi/' \
        | $PERL_PROG -ne "s#mtpt=[^,|^\n|^\s]*#mtpt=$FS_ESCAPED\1\2#; print;"

}

# Used for mounting non-scratch devices (e.g. loop, dm constructs)
# with the safe set of scratch mount options (e.g. loop image may be
# hosted on $SCRATCH_DEV, so can't use external scratch devices).
_common_dev_mount_options()
{
	echo $MOUNT_OPTIONS $SELINUX_MOUNT_OPTIONS $*
}

_overlay_basic_mount_options()
{
	echo "-o lowerdir=$1/$OVERLAY_LOWER_DIR,upperdir=$1/$OVERLAY_UPPER_DIR,workdir=$1/$OVERLAY_WORK_DIR"
}

_overlay_mount_options()
{
	echo `_common_dev_mount_options` \
	     `_overlay_basic_mount_options $1` \
	     $OVERLAY_MOUNT_OPTIONS
}

_scratch_mount_options()
{
	_scratch_options mount

	if [ "$FSTYP" == "overlay" ]; then
		echo `_overlay_mount_options $SCRATCH_DEV`
		return 0
	fi
	echo `_common_dev_mount_options $*` $SCRATCH_OPTIONS \
					$SCRATCH_DEV $SCRATCH_MNT
}

# helper function to do the actual overlayfs mount operation
_overlay_mount_dirs()
{
	local lowerdir=$1
	local upperdir=$2
	local workdir=$3
	shift 3

	$MOUNT_PROG -t overlay -o lowerdir=$lowerdir -o upperdir=$upperdir \
		    -o workdir=$workdir $*
}

# Given a dir, set up 3 subdirectories and mount on the given mnt.
# The dir is used as the mount device so it can be seen from df or mount
_overlay_mount()
{
	local dir=$1
	local mnt=$2
	shift 2

	local upper_fst=$(df --output=fstype $dir | tail -1)
	case "$upper_fst" in
	xfs)
		if ! xfs_info $dir | grep -q "ftype=1" ; then
			_notrun "upper fs needs to support d_type"
		fi
		;;
	ext2|ext3|ext4)
		if ! tune2fs -l $(df --output=source $dir | tail -1) | \
		   grep -q filetype ; then
			_notrun "upper fs needs to support d_type"
		fi
		;;
	esac

	mkdir -p $dir/$OVERLAY_UPPER_DIR
	mkdir -p $dir/$OVERLAY_LOWER_DIR
	mkdir -p $dir/$OVERLAY_WORK_DIR

	_overlay_mount_dirs $dir/$OVERLAY_LOWER_DIR $dir/$OVERLAY_UPPER_DIR \
			    $dir/$OVERLAY_WORK_DIR $OVERLAY_MOUNT_OPTIONS \
			    $SELINUX_MOUNT_OPTIONS $* $dir $mnt
}

_overlay_test_mount()
{
	_overlay_mount $TEST_DEV $TEST_DIR $*
}

_overlay_scratch_mount()
{
	_overlay_mount $SCRATCH_DEV $SCRATCH_MNT $*
}

_overlay_test_unmount()
{
	$UMOUNT_PROG $TEST_DIR
}

_overlay_scratch_unmount()
{
	$UMOUNT_PROG $SCRATCH_MNT
}

_scratch_mount()
{
    if [ "$FSTYP" == "overlay" ]; then
        _overlay_scratch_mount $*
        return $?
    fi
    _mount -t $FSTYP `_scratch_mount_options $*`
}

_scratch_unmount()
{
	case "$FSTYP" in
	overlay)
		_overlay_scratch_unmount
		;;
	btrfs)
		$UMOUNT_PROG $SCRATCH_MNT
		;;
	*)
		$UMOUNT_PROG $SCRATCH_DEV
		;;
	esac
}

_scratch_remount()
{
    local opts="$1"

    if test -n "$opts"; then
	mount -o "remount,$opts" $SCRATCH_MNT
    fi
}

_scratch_cycle_mount()
{
    local opts="$1"

    if [ "$FSTYP" = tmpfs ]; then
	_scratch_remount "$opts"
	return
    fi
    if test -n "$opts"; then
	opts="-o $opts"
    fi
    _scratch_unmount
    _scratch_mount "$opts"
}

_test_mount()
{
    if [ "$FSTYP" == "overlay" ]; then
        _overlay_test_mount $*
        return $?
    fi
    _test_options mount
    _mount -t $FSTYP $TEST_OPTIONS $TEST_FS_MOUNT_OPTS $SELINUX_MOUNT_OPTIONS $* $TEST_DEV $TEST_DIR
}

_test_unmount()
{
	if [ "$FSTYP" == "overlay" ]; then
		_overlay_test_unmount
	else
		$UMOUNT_PROG $TEST_DEV
	fi
}

_test_cycle_mount()
{
    if [ "$FSTYP" = tmpfs ]; then
	return
    fi
    _test_unmount
    _test_mount
}

_scratch_mkfs_options()
{
    _scratch_options mkfs
    echo $SCRATCH_OPTIONS $MKFS_OPTIONS $* $SCRATCH_DEV
}

_scratch_metadump()
{
	dumpfile=$1
	options=

	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		options="-l $SCRATCH_LOGDEV"

	xfs_metadump $options $SCRATCH_DEV $dumpfile
}

_setup_large_xfs_fs()
{
	fs_size=$1
	local tmp_dir=/tmp/

	[ "$LARGE_SCRATCH_DEV" != yes ] && return 0
	[ -z "$SCRATCH_DEV_EMPTY_SPACE" ] && SCRATCH_DEV_EMPTY_SPACE=0
	[ $SCRATCH_DEV_EMPTY_SPACE -ge $fs_size ] && return 0

	# calculate the size of the file we need to allocate.
	# Default free space in the FS is 50GB, but you can specify more via
	# SCRATCH_DEV_EMPTY_SPACE
	file_size=$(($fs_size - 50*1024*1024*1024))
	file_size=$(($file_size - $SCRATCH_DEV_EMPTY_SPACE))

	# mount the filesystem, create the file, unmount it
	_scratch_mount 2>&1 >$tmp_dir/mnt.err
	local status=$?
	if [ $status -ne 0 ]; then
		echo "mount failed"
		cat $tmp_dir/mnt.err >&2
		rm -f $tmp_dir/mnt.err
		return $status
	fi
	rm -f $tmp_dir/mnt.err

	xfs_io -F -f \
		-c "truncate $file_size" \
		-c "falloc -k 0 $file_size" \
		-c "chattr +d" \
		$SCRATCH_MNT/.use_space 2>&1 > /dev/null
	export NUM_SPACE_FILES=1
	status=$?
	_scratch_unmount
	if [ $status -ne 0 ]; then
		echo "large file prealloc failed"
		cat $tmp_dir/mnt.err >&2
		return $status
	fi
	return 0
}

_scratch_mkfs_xfs_opts()
{
	mkfs_opts=$*

	# remove metadata related mkfs options if mkfs.xfs doesn't them
	if [ -n "$XFS_MKFS_HAS_NO_META_SUPPORT" ]; then
		mkfs_opts=`echo $mkfs_opts | sed "s/-m\s\+\S\+//g"`
	fi

	_scratch_options mkfs

	$MKFS_XFS_PROG $SCRATCH_OPTIONS $mkfs_opts $SCRATCH_DEV
}


_scratch_mkfs_xfs_supported()
{
	local mkfs_opts=$*

	_scratch_options mkfs

	$MKFS_XFS_PROG -N $MKFS_OPTIONS $SCRATCH_OPTIONS $mkfs_opts $SCRATCH_DEV
	local mkfs_status=$?

	# a mkfs failure may be caused by conflicts between $MKFS_OPTIONS and
	# $mkfs_opts, try again without $MKFS_OPTIONS
	if [ $mkfs_status -ne 0 -a -n "$mkfs_opts" ]; then
		$MKFS_XFS_PROG -N $SCRATCH_OPTIONS $mkfs_opts $SCRATCH_DEV
		mkfs_status=$?
	fi
	return $mkfs_status
}

_scratch_mkfs_xfs()
{
	# extra mkfs options can be added by tests
	local extra_mkfs_options=$*

	local tmp_dir=/tmp/

	# save mkfs output in case conflict means we need to run again.
	# only the output for the mkfs that applies should be shown
	_scratch_mkfs_xfs_opts $MKFS_OPTIONS $extra_mkfs_options \
		2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
	local mkfs_status=$?


	# a mkfs failure may be caused by conflicts between
	# $MKFS_OPTIONS and $extra_mkfs_options
	if [ $mkfs_status -ne 0 -a ! -z "$extra_mkfs_options" ]; then
		(
		echo -n "** mkfs failed with extra mkfs options "
		echo "added to \"$MKFS_OPTIONS\" by test $seq **"
		echo -n "** attempting to mkfs using only test $seq "
		echo "options: $extra_mkfs_options **"
		) >> $seqres.full

		# running mkfs again. overwrite previous mkfs output files
		_scratch_mkfs_xfs_opts $extra_mkfs_options \
			2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
		local mkfs_status=$?
	fi

	if [ $mkfs_status -eq 0 -a "$LARGE_SCRATCH_DEV" = yes ]; then
		# manually parse the mkfs output to get the fs size in bytes
		local fs_size
		fs_size=`cat $tmp_dir.mkfsstd | perl -ne '
			if (/^data\s+=\s+bsize=(\d+)\s+blocks=(\d+)/) {
				my $size = $1 * $2;
				print STDOUT "$size\n";
			}'`
		_setup_large_xfs_fs $fs_size
		mkfs_status=$?
	fi

	# output stored mkfs output, filtering unnecessary warnings from stderr
	cat $tmp_dir.mkfsstd
	cat $tmp_dir.mkfserr | sed \
		-e '/less than device physical sector/d' \
		-e '/switching to logical sector/d' \
		>&2
	rm -f $tmp_dir.mkfserr $tmp_dir.mkfsstd

	return $mkfs_status
}

# xfs_check script is planned to be deprecated. But, we want to
# be able to invoke "xfs_check" behavior in xfstests in order to
# maintain the current verification levels.
_xfs_check()
{
    OPTS=" "
    DBOPTS=" "
    USAGE="Usage: xfs_check [-fsvV] [-l logdev] [-i ino]... [-b bno]... special"

    while getopts "b:fi:l:stvV" c
    do
        case $c in
            s) OPTS=$OPTS"-s ";;
            t) OPTS=$OPTS"-t ";;
            v) OPTS=$OPTS"-v ";;
            i) OPTS=$OPTS"-i "$OPTARG" ";;
            b) OPTS=$OPTS"-b "$OPTARG" ";;
            f) DBOPTS=$DBOPTS" -f";;
            l) DBOPTS=$DBOPTS" -l "$OPTARG" ";;
            V) $XFS_DB_PROG -p xfs_check -V
                return $?
                ;;
        esac
    done
    set -- extra $@
    shift $OPTIND
    case $# in
        1)    ${XFS_DB_PROG}${DBOPTS} -F -i -p xfs_check -c "check$OPTS" $1
               status=$?
               ;;
        2)    echo $USAGE 1>&1
              status=2
              ;;
    esac
    return $status
}

_setup_large_ext4_fs()
{
	fs_size=$1
	local tmp_dir=/tmp/

	[ "$LARGE_SCRATCH_DEV" != yes ] && return 0
	[ -z "$SCRATCH_DEV_EMPTY_SPACE" ] && SCRATCH_DEV_EMPTY_SPACE=0
	[ $SCRATCH_DEV_EMPTY_SPACE -ge $fs_size ] && return 0

	# Default free space in the FS is 50GB, but you can specify more via
	# SCRATCH_DEV_EMPTY_SPACE
	space_to_consume=$(($fs_size - 50*1024*1024*1024 - $SCRATCH_DEV_EMPTY_SPACE))

	# mount the filesystem and create 16TB - 4KB files until we consume
	# all the necessary space.
	_scratch_mount 2>&1 >$tmp_dir/mnt.err
	local status=$?
	if [ $status -ne 0 ]; then
		echo "mount failed"
		cat $tmp_dir/mnt.err >&2
		rm -f $tmp_dir/mnt.err
		return $status
	fi
	rm -f $tmp_dir/mnt.err

	file_size=$((16*1024*1024*1024*1024 - 4096))
	nfiles=0
	while [ $space_to_consume -gt $file_size ]; do

		xfs_io -F -f \
			-c "truncate $file_size" \
			-c "falloc -k 0 $file_size" \
			$SCRATCH_MNT/.use_space.$nfiles 2>&1
		status=$?
		if [ $status -ne 0 ]; then
			break;
		fi

		space_to_consume=$(( $space_to_consume - $file_size ))
		nfiles=$(($nfiles + 1))
	done

	# consume the remaining space.
	if [ $space_to_consume -gt 0 ]; then
		xfs_io -F -f \
			-c "truncate $space_to_consume" \
			-c "falloc -k 0 $space_to_consume" \
			$SCRATCH_MNT/.use_space.$nfiles 2>&1
		status=$?
	fi
	export NUM_SPACE_FILES=$nfiles

	_scratch_unmount
	if [ $status -ne 0 ]; then
		echo "large file prealloc failed"
		cat $tmp_dir/mnt.err >&2
		return $status
	fi
	return 0
}

_scratch_mkfs_ext4()
{
	# extra mkfs options can be added by tests
	local extra_mkfs_options=$*

	local tmp_dir=/tmp/

	$MKFS_EXT4_PROG -F $MKFS_OPTIONS $extra_mkfs_options $SCRATCH_DEV \
			2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
	local mkfs_status=$?

	# a mkfs failure may be caused by conflicts between
	# $MKFS_OPTIONS and $extra_mkfs_options
	if [ $mkfs_status -ne 0 -a ! -z "$extra_mkfs_options" ]; then
		(
		echo -n "** mkfs failed with extra mkfs options "
		echo "added to \"$MKFS_OPTIONS\" by test $seq **"
		echo -n "** attempting to mkfs using only test $seq "
		echo "options: $extra_mkfs_options **"
		) >> $seqres.full

		# running mkfs again. overwrite previous mkfs output files
		$MKFS_EXT4_PROG -F $extra_mkfs_options $SCRATCH_DEV \
				2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
		local mkfs_status=$?
	fi

	if [ $mkfs_status -eq 0 -a "$LARGE_SCRATCH_DEV" = yes ]; then
		# manually parse the mkfs output to get the fs size in bytes
		fs_size=`cat $tmp_dir.mkfsstd | awk ' \
			/^Block size/ { split($2, a, "="); bs = a[2] ; } \
			/ inodes, / { blks = $3 } \
			/reserved for the super user/ { resv = $1 } \
			END { fssize = bs * blks - resv; print fssize }'`

		_setup_large_ext4_fs $fs_size
		mkfs_status=$?
	fi

	# output stored mkfs output
	grep -v -e ^Warning: -e "^mke2fs " $tmp_dir.mkfserr >&2
	cat $tmp_dir.mkfsstd
	rm -f $tmp_dir.mkfserr $tmp_dir.mkfsstd

	return $mkfs_status
}

_test_mkfs()
{
    case $FSTYP in
    nfs*)
	# do nothing for nfs
	;;
    cifs)
	# do nothing for cifs
	;;
    overlay)
	# do nothing for overlay
	;;
    udf)
        $MKFS_UDF_PROG $MKFS_OPTIONS $* $TEST_DEV > /dev/null
	;;
    btrfs)
        $MKFS_BTRFS_PROG $MKFS_OPTIONS $* $TEST_DEV > /dev/null
	;;
    ext2|ext3|ext4)
	$MKFS_PROG -t $FSTYP -- -F $MKFS_OPTIONS $* $TEST_DEV
	;;
    *)
	yes | $MKFS_PROG -t $FSTYP -- $MKFS_OPTIONS $* $TEST_DEV
	;;
    esac
}

_mkfs_dev()
{
    case $FSTYP in
    nfs*)
	# do nothing for nfs
	;;
    overlay)
	# do nothing for overlay
	;;
    udf)
        $MKFS_UDF_PROG $MKFS_OPTIONS $* 2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
	;;
    btrfs)
        $MKFS_BTRFS_PROG $MKFS_OPTIONS $* 2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
	;;
    ext2|ext3|ext4)
	$MKFS_PROG -t $FSTYP -- -F $MKFS_OPTIONS $* \
		2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
	;;

    *)
	yes | $MKFS_PROG -t $FSTYP -- $MKFS_OPTIONS $* \
		2>$tmp_dir.mkfserr 1>$tmp_dir.mkfsstd
	;;
    esac

    if [ $? -ne 0 ]; then
	# output stored mkfs output
	cat $tmp_dir.mkfserr >&2
	cat $tmp_dir.mkfsstd
	status=1
	exit 1
    fi
    rm -f $tmp_dir.mkfserr $tmp_dir.mkfsstd
}

# remove all files in $SCRATCH_MNT, useful when testing on NFS/CIFS
_scratch_cleanup_files()
{
	case $FSTYP in
	overlay)
		# $SCRATCH_DEV is a valid directory in overlay case
		rm -rf $SCRATCH_DEV/*
		;;
	*)
		_scratch_mount
		rm -rf $SCRATCH_MNT/*
		_scratch_unmount
		;;
	esac
}

_scratch_mkfs()
{
    case $FSTYP in
    xfs)
        _scratch_mkfs_xfs $*
	;;
    nfs*)
	# unable to re-create NFS, just remove all files in $SCRATCH_MNT to
	# avoid EEXIST caused by the leftover files created in previous runs
        _scratch_cleanup_files
	;;
    cifs)
	# unable to re-create CIFS, just remove all files in $SCRATCH_MNT to
	# avoid EEXIST caused by the leftover files created in previous runs
        _scratch_cleanup_files
	;;
    overlay)
	# unable to re-create overlay, remove all files in $SCRATCH_MNT to
	# avoid EEXIST caused by the leftover files created in previous runs
        _scratch_cleanup_files
	;;
    udf)
        $MKFS_UDF_PROG $MKFS_OPTIONS $* $SCRATCH_DEV > /dev/null
	;;
    btrfs)
        $MKFS_BTRFS_PROG $MKFS_OPTIONS $* $SCRATCH_DEV > /dev/null
	;;
    ext2|ext3)
	$MKFS_PROG -t $FSTYP -- -F $MKFS_OPTIONS $* $SCRATCH_DEV
	;;
    ext4)
	_scratch_mkfs_ext4 $*
	;;
    tmpfs)
	# do nothing for tmpfs
	;;
    f2fs)
        $MKFS_F2FS_PROG $MKFS_OPTIONS $* $SCRATCH_DEV > /dev/null
	;;
    *)
	yes | $MKFS_PROG -t $FSTYP -- $MKFS_OPTIONS $* $SCRATCH_DEV
	;;
    esac
}

# Helper function to get a spare or replace-target device from
# configured SCRATCH_DEV_POLL, must call _scratch_dev_pool_get()
# before _spare_dev_get(). Replace-target-device/Spare-device will
# be assigned to SPARE_DEV.
# As of now only one replace-target-device/spare-device can be
# assigned.
#
# Usage:
#  _scratch_dev_pool_get() <ndevs>
#     _spare_dev_get()
#     :: do stuff
#     _spare_dev_put()
#  _scratch_dev_pool_put()
#
_spare_dev_get()
{
	typeset -p SCRATCH_DEV_POOL_SAVED >/dev/null 2>&1
	if [ $? -ne 0 ]; then
		_fail "Bug: unset val, must call _scratch_dev_pool_get before _spare_dev_get"
	fi

	if [ -z "$SCRATCH_DEV_POOL_SAVED" ]; then
		_fail "Bug: str empty, must call _scratch_dev_pool_get before _spare_dev_get"
	fi

	# Check if the spare is already assigned
	typeset -p SPARE_DEV >/dev/null 2>&1
	if [ $? -eq 0 ]; then
		if [ ! -z "$SPARE_DEV" ]; then
			_fail "Bug: SPARE_DEV = $SPARE_DEV already assigned"
		fi
	fi

	local ndevs=`echo $SCRATCH_DEV_POOL| wc -w`
	local config_ndevs=`echo $SCRATCH_DEV_POOL_SAVED| wc -w`

	if [ $ndevs -eq $config_ndevs ]; then
		_notrun "All devs used no spare"
	fi
	# Get a dev that is not used
	local devs[]="( $SCRATCH_DEV_POOL_SAVED )"
	SPARE_DEV=${devs[@]:$ndevs:1}
	export SPARE_DEV
}

_spare_dev_put()
{
	typeset -p SPARE_DEV >/dev/null 2>&1
	if [ $? -ne 0 ]; then
		_fail "Bug: unset val, must call _spare_dev_get before its put"
	fi

	if [ -z "$SPARE_DEV" ]; then
		_fail "Bug: str empty, must call _spare_dev_get before its put"
	fi

	export SPARE_DEV=""
}

#
# Generally test cases will have..
#   _require_scratch_dev_pool X
# to make sure it has the enough scratch devices including
# replace-target and spare device. Now arg1 here is the
# required number of scratch devices by a-test-case excluding
# the replace-target and spare device. So this function will
# set SCRATCH_DEV_POOL to the specified number of devices.
#
# Usage:
#  _scratch_dev_pool_get() <ndevs>
#     :: do stuff
#
#  _scratch_dev_pool_put()
#
_scratch_dev_pool_get()
{
	if [ $# -ne 1 ]; then
		_fail "Usage: _scratch_dev_pool_get ndevs"
	fi

	local test_ndevs=$1
	local config_ndevs=`echo $SCRATCH_DEV_POOL| wc -w`
	local devs[]="( $SCRATCH_DEV_POOL )"

	typeset -p config_ndevs >/dev/null 2>&1
	if [ $? -ne 0 ]; then
		_fail "Bug: cant find SCRATCH_DEV_POOL ndevs"
	fi

	if [ $config_ndevs -lt $test_ndevs ]; then
		_notrun "Need at least test requested number of ndevs $test_ndevs"
	fi

	SCRATCH_DEV_POOL_SAVED=${SCRATCH_DEV_POOL}
	export SCRATCH_DEV_POOL_SAVED
	SCRATCH_DEV_POOL=${devs[@]:0:$test_ndevs}
	export SCRATCH_DEV_POOL
}

_scratch_dev_pool_put()
{
	typeset -p SCRATCH_DEV_POOL_SAVED >/dev/null 2>&1
	if [ $? -ne 0 ]; then
		_fail "Bug: unset val, must call _scratch_dev_pool_get before _scratch_dev_pool_put"
	fi

	if [ -z "$SCRATCH_DEV_POOL_SAVED" ]; then
		_fail "Bug: str empty, must call _scratch_dev_pool_get before _scratch_dev_pool_put"
	fi

	export SCRATCH_DEV_POOL=$SCRATCH_DEV_POOL_SAVED
	export SCRATCH_DEV_POOL_SAVED=""
}

_scratch_pool_mkfs()
{
    case $FSTYP in
    btrfs)
        # if dup profile is in mkfs options call _scratch_mkfs instead
        # because dup profile only works with single device
        if [[ "$*" =~ dup ]]; then
            _scratch_mkfs $*
        else
            $MKFS_BTRFS_PROG $MKFS_OPTIONS $* $SCRATCH_DEV_POOL > /dev/null
        fi
        ;;
    *)
        echo "_scratch_pool_mkfs is not implemented for $FSTYP" 1>&2
        ;;
    esac
}

# Return the amount of free memory available on the system
_free_memory_bytes()
{
    free -b | grep ^Mem | awk '{print $4}'
}

# Create fs of certain size on scratch device
# _scratch_mkfs_sized <size in bytes> [optional blocksize]
_scratch_mkfs_sized()
{
    fssize=$1
    blocksize=$2

    case $FSTYP in
    xfs)
	def_blksz=`echo $MKFS_OPTIONS|sed -rn 's/.*-b ?size= ?+([0-9]+).*/\1/p'`
	;;
    ext2|ext3|ext4|ext4dev|udf|btrfs|reiser4)
	def_blksz=`echo $MKFS_OPTIONS| sed -rn 's/.*-b ?+([0-9]+).*/\1/p'`
	;;
    esac

    [ -n "$def_blksz" ] && blocksize=$def_blksz
    [ -z "$blocksize" ] && blocksize=4096


    re='^[0-9]+$'
    if ! [[ $fssize =~ $re ]] ; then
        _notrun "error: _scratch_mkfs_sized: fs size \"$fssize\" not an integer."
    fi
    if ! [[ $blocksize =~ $re ]] ; then
        _notrun "error: _scratch_mkfs_sized: block size \"$blocksize\" not an integer."
    fi

    blocks=`expr $fssize / $blocksize`

    if [ "$HOSTOS" == "Linux" -a -b "$SCRATCH_DEV" ]; then
	devsize=`blockdev --getsize64 $SCRATCH_DEV`
	[ "$fssize" -gt "$devsize" ] && _notrun "Scratch device too small"
    fi

    case $FSTYP in
    xfs)
	# don't override MKFS_OPTIONS that set a block size.
	echo $MKFS_OPTIONS |egrep -q "b?size="
	if [ $? -eq 0 ]; then
		_scratch_mkfs_xfs -d size=$fssize
	else
		_scratch_mkfs_xfs -d size=$fssize -b size=$blocksize
	fi
	;;
    ext2|ext3|ext4|ext4dev)
	${MKFS_PROG}.$FSTYP -F $MKFS_OPTIONS -b $blocksize $SCRATCH_DEV $blocks
	;;
    udf)
	$MKFS_UDF_PROG $MKFS_OPTIONS -b $blocksize $SCRATCH_DEV $blocks
	;;
    btrfs)
	local mixed_opt=
	(( fssize <= 100 * 1024 * 1024 )) && mixed_opt='--mixed'
	$MKFS_BTRFS_PROG $MKFS_OPTIONS $mixed_opt -b $fssize $SCRATCH_DEV
	;;
    reiser4)
	# mkfs.resier4 requires size in KB as input for creating filesystem
	$MKFS_REISER4_PROG $MKFS_OPTIONS -y -b $blocksize $SCRATCH_DEV \
			   `expr $fssize / 1024`
	;;
    f2fs)
	# mkfs.f2fs requires # of sectors as an input for the size
	sector_size=`blockdev --getss $SCRATCH_DEV`
	$MKFS_F2FS_PROG $MKFS_OPTIONS $SCRATCH_DEV `expr $fssize / $sector_size`
	;;
    tmpfs)
	free_mem=`_free_memory_bytes`
	if [ "$free_mem" -lt "$fssize" ] ; then
	   _notrun "Not enough memory ($free_mem) for tmpfs with $fssize bytes"
	fi
	export MOUNT_OPTIONS="-o size=$fssize $TMPFS_MOUNT_OPTIONS"
	;;
    *)
	_notrun "Filesystem $FSTYP not supported in _scratch_mkfs_sized"
	;;
    esac
}

# Emulate an N-data-disk stripe w/ various stripe units
# _scratch_mkfs_geom <sunit bytes> <swidth multiplier> [optional blocksize]
_scratch_mkfs_geom()
{
    sunit_bytes=$1
    swidth_mult=$2
    blocksize=$3
    [ -z "$blocksize" ] && blocksize=4096

    let sunit_blocks=$sunit_bytes/$blocksize
    let swidth_blocks=$sunit_blocks*$swidth_mult

    case $FSTYP in
    xfs)
	MKFS_OPTIONS+=" -b size=$blocksize, -d su=$sunit_bytes,sw=$swidth_mult"
	;;
    ext4|ext4dev)
	MKFS_OPTIONS+=" -b $blocksize -E stride=$sunit_blocks,stripe_width=$swidth_blocks"
	;;
    *)
	_notrun "can't mkfs $FSTYP with geometry"
	;;
    esac
    _scratch_mkfs
}

# Create fs of certain blocksize on scratch device
# _scratch_mkfs_blocksized blocksize
_scratch_mkfs_blocksized()
{
    blocksize=$1

    re='^[0-9]+$'
    if ! [[ $blocksize =~ $re ]] ; then
        _notrun "error: _scratch_mkfs_sized: block size \"$blocksize\" not an integer."
    fi

    case $FSTYP in
    xfs)
	_scratch_mkfs_xfs $MKFS_OPTIONS -b size=$blocksize
	;;
    ext2|ext3|ext4|ocfs2)
	${MKFS_PROG}.$FSTYP -F $MKFS_OPTIONS -b $blocksize $SCRATCH_DEV
	;;
    *)
	_notrun "Filesystem $FSTYP not supported in _scratch_mkfs_blocksized"
	;;
    esac
}

_scratch_resvblks()
{
	case $FSTYP in
	xfs)
		xfs_io -x -c "resblks $1" $SCRATCH_MNT
		;;
	*)
		;;
	esac
}

_scratch_xfs_db_options()
{
    SCRATCH_OPTIONS=""
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
        SCRATCH_OPTIONS="-l$SCRATCH_LOGDEV"
    echo $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

_scratch_xfs_db()
{
	$XFS_DB_PROG "$@" $(_scratch_xfs_db_options)
}

_scratch_xfs_logprint()
{
    SCRATCH_OPTIONS=""
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
        SCRATCH_OPTIONS="-l$SCRATCH_LOGDEV"
    $XFS_LOGPRINT_PROG $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

_test_xfs_logprint()
{
	TEST_OPTIONS=""
	[ "$USE_EXTERNAL" = yes -a ! -z "$TEST_LOGDEV" ] && \
		TEST_OPTIONS="-l$TEST_LOGDEV"
	$XFS_LOGPRINT_PROG $TEST_OPTIONS $* $TEST_DEV
}

_scratch_xfs_check()
{
    SCRATCH_OPTIONS=""
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
        SCRATCH_OPTIONS="-l $SCRATCH_LOGDEV"
    [ "$LARGE_SCRATCH_DEV" = yes ] && \
        SCRATCH_OPTIONS=$SCRATCH_OPTIONS" -t"
    _xfs_check $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

_scratch_xfs_repair()
{
    SCRATCH_OPTIONS=""
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
        SCRATCH_OPTIONS="-l$SCRATCH_LOGDEV"
    [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ] && \
        SCRATCH_OPTIONS=$SCRATCH_OPTIONS" -r$SCRATCH_RTDEV"
    [ "$LARGE_SCRATCH_DEV" = yes ] && SCRATCH_OPTIONS=$SCRATCH_OPTIONS" -t"
    $XFS_REPAIR_PROG $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

# Repair scratch filesystem.  Returns 0 if the FS is good to go (either no
# errors found or errors were fixed) and nonzero otherwise; also spits out
# a complaint on stderr if fsck didn't tell us that the FS is good to go.
_repair_scratch_fs()
{
    case $FSTYP in
    xfs)
        _scratch_xfs_repair "$@" 2>&1
	res=$?
	if [ "$res" -ne 0 ]; then
		echo "xfs_repair returns $res; replay log?"
		_scratch_mount
		res=$?
		if [ "$res" -gt 0 ]; then
			echo "mount returns $res; zap log?"
			_scratch_xfs_repair -L 2>&1
			echo "log zap returns $?"
		else
			umount "$SCRATCH_MNT"
		fi
		_scratch_xfs_repair "$@" 2>&1
		res=$?
	fi
	test $res -ne 0 && >&2 echo "xfs_repair failed, err=$res"
	return $res
        ;;
    *)
        # Let's hope fsck -y suffices...
        fsck -t $FSTYP -y $SCRATCH_DEV 2>&1
	res=$?
	case $res in
	0|1|2)
		res=0
		;;
	*)
		>&2 echo "fsck.$FSTYP failed, err=$res"
		;;
	esac
	return $res
        ;;
    esac
}

_get_pids_by_name()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _get_pids_by_name process-name" 1>&2
	exit 1
    fi

    # Algorithm ... all ps(1) variants have a time of the form MM:SS or
    # HH:MM:SS before the psargs field, use this as the search anchor.
    #
    # Matches with $1 (process-name) occur if the first psarg is $1
    # or ends in /$1 ... the matching uses sed's regular expressions,
    # so passing a regex into $1 will work.

    ps $PS_ALL_FLAGS \
    | sed -n \
	-e 's/$/ /' \
	-e 's/[ 	][ 	]*/ /g' \
	-e 's/^ //' \
	-e 's/^[^ ]* //' \
	-e "/[0-9]:[0-9][0-9]  *[^ ]*\/$1 /s/ .*//p" \
	-e "/[0-9]:[0-9][0-9]  *$1 /s/ .*//p"
}

# fix malloc libs output
#
_fix_malloc()
{
    # filter out the Electric Fence notice
    $PERL_PROG -e '
        while (<>) {
            if (defined $o && /^\s+Electric Fence/) {
                chomp($o);
                print "$o";
                undef $o;
                next;
            }
            print $o if (defined $o);

            $o=$_;
        }
        print $o if (defined $o);
    '
}

#
# _df_device : get an IRIX style df line for a given device
#
#       - returns "" if not mounted
#       - returns fs type in field two (ala IRIX)
#       - joins line together if split by fancy df formatting
#       - strips header etc
#

_df_device()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _df_device device" 1>&2
	exit 1
    fi

    # Note that we use "==" here so awk doesn't try to interpret an NFS over
    # IPv6 server as a regular expression.
    $DF_PROG 2>/dev/null | $AWK_PROG -v what=$1 '
        ($1==what) && (NF==1) {
            v=$1
            getline
            print v, $0
            exit
        }
        ($1==what) {
            print
            exit
        }
    '
}

#
# _df_dir : get an IRIX style df line for device where a directory resides
#
#       - returns fs type in field two (ala IRIX)
#       - joins line together if split by fancy df formatting
#       - strips header etc
#

_df_dir()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _df_dir device" 1>&2
	exit 1
    fi

    $DF_PROG $1 2>/dev/null | $AWK_PROG -v what=$1 '
        NR == 2 && NF==1 {
            v=$1
            getline
            print v, $0;
            exit 0
        }
        NR == 2 {
            print;
            exit 0
        }
        {}
    '
    # otherwise, nada
}

# return percentage used disk space for mounted device

_used()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _used device" 1>&2
	exit 1
    fi

    _df_device $1 | $AWK_PROG '{ sub("%", "") ; print $6 }'
}

# return the FS type of a mounted device
#
_fs_type()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _fs_type device" 1>&2
	exit 1
    fi

    #
    # The Linux kernel shows NFSv4 filesystems in df output as
    # filesystem type nfs4, although we mounted it as nfs earlier.
    # Fix the filesystem type up here so that the callers don't
    # have to bother with this quirk.
    #
    _df_device $1 | $AWK_PROG '{ print $2 }' | sed -e 's/nfs4/nfs/'
}

# return the FS mount options of a mounted device
#
# should write a version which just parses the output of mount for IRIX
# compatibility, but since this isn't used at all, at the moment I'll leave
# this for now
#
_fs_options()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _fs_options device" 1>&2
	exit 1
    fi

    $AWK_PROG -v dev=$1 '
        match($1,dev) { print $4 }
    ' </proc/mounts
}

# returns device number if a file is a block device
#
_is_block_dev()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _is_block_dev dev" 1>&2
	exit 1
    fi

    _dev=$1
    if [ -L "${_dev}" ]; then
        _dev=`readlink -f "${_dev}"`
    fi

    if [ -b "${_dev}" ]; then
        src/lstat64 "${_dev}" | $AWK_PROG '/Device type:/ { print $9 }'
    fi
}

# Do a command, log it to $seqres.full, optionally test return status
# and die if command fails. If called with one argument _do executes the
# command, logs it, and returns its exit status. With two arguments _do
# first prints the message passed in the first argument, and then "done"
# or "fail" depending on the return status of the command passed in the
# second argument. If the command fails and the variable _do_die_on_error
# is set to "always" or the two argument form is used and _do_die_on_error
# is set to "message_only" _do will print an error message to
# $seqres.out and exit.

_do()
{
    if [ $# -eq 1 ]; then
	_cmd=$1
    elif [ $# -eq 2 ]; then
	_note=$1
	_cmd=$2
	echo -n "$_note... "
    else
	echo "Usage: _do [note] cmd" 1>&2
	status=1; exit
    fi

    (eval "echo '---' \"$_cmd\"") >>$seqres.full
    (eval "$_cmd") >$tmp._out 2>&1; ret=$?
    cat $tmp._out | _fix_malloc >>$seqres.full
    if [ $# -eq 2 ]; then
	if [ $ret -eq 0 ]; then
	    echo "done"
	else
	    echo "fail"
	fi
    fi
    if [ $ret -ne 0  ] \
	&& [ "$_do_die_on_error" = "always" \
	    -o \( $# -eq 2 -a "$_do_die_on_error" = "message_only" \) ]
    then
	[ $# -ne 2 ] && echo
	eval "echo \"$_cmd\" failed \(returned $ret\): see $seqres.full"
	status=1; exit
    fi

    return $ret
}

# bail out, setting up .notrun file. Need to kill the filesystem check files
# here, otherwise they are set incorrectly for the next test.
#
_notrun()
{
    echo "$*" > $seqres.notrun
    echo "$seq not run: $*"
    rm -f ${RESULT_DIR}/require_test
    rm -f ${RESULT_DIR}/require_scratch
    status=0
    exit
}

# just plain bail out
#
_fail()
{
    echo "$*" | tee -a $seqres.full
    echo "(see $seqres.full for details)"
    status=1
    exit 1
}

# tests whether $FSTYP is one of the supported filesystems for a test
#
_supported_fs()
{
    for f
    do
	if [ "$f" = "$FSTYP" -o "$f" = "generic" ]
	then
	    return
	fi
    done

    _notrun "not suitable for this filesystem type: $FSTYP"
}


# tests whether $FSTYP is one of the supported OSes for a test
#
_supported_os()
{
    for h
    do
	if [ "$h" = "$HOSTOS" ]
	then
	    return
	fi
    done

    _notrun "not suitable for this OS: $HOSTOS"
}

_require_btrfs_loadable()
{
	modprobe -r btrfs || _notrun "btrfs unloadable"
	modprobe btrfs || _notrun "Can't load btrfs"
}

_reload_btrfs_ko()
{
	modprobe -r btrfs || _fail "btrfs unload failed"
	modprobe btrfs || _fail "btrfs load failed"
}

# this test needs a scratch partition - check we're ok & unmount it
# No post-test check of the device is required. e.g. the test intentionally
# finishes the test with the filesystem in a corrupt state
_require_scratch_nocheck()
{
    case "$FSTYP" in
	nfs*)
		echo $SCRATCH_DEV | grep -q ":/" > /dev/null 2>&1
		if [ -z "$SCRATCH_DEV" -o "$?" != "0" ]; then
			_notrun "this test requires a valid \$SCRATCH_DEV"
		fi
		if [ ! -d "$SCRATCH_MNT" ]; then
			_notrun "this test requires a valid \$SCRATCH_MNT"
		fi
		;;
	cifs)
		echo $SCRATCH_DEV | grep -q "//" > /dev/null 2>&1
		if [ -z "$SCRATCH_DEV" -o "$?" != "0" ]; then
			_notrun "this test requires a valid \$SCRATCH_DEV"
		fi
		if [ ! -d "$SCRATCH_MNT" ]; then
		     _notrun "this test requires a valid \$SCRATCH_MNT"
		fi
		;;
	overlay)
		if [ -z "$SCRATCH_DEV" -o ! -d "$SCRATCH_DEV" ]; then
			_notrun "this test requires a valid \$SCRATCH_DEV as ovl base dir"
		fi
		if [ ! -d "$SCRATCH_MNT" ]; then
			_notrun "this test requires a valid \$SCRATCH_MNT"
		fi
		;;
	tmpfs)
		if [ -z "$SCRATCH_DEV" -o ! -d "$SCRATCH_MNT" ];
		then
		    _notrun "this test requires a valid \$SCRATCH_MNT and unique $SCRATCH_DEV"
		fi
		;;
	*)
		 if [ -z "$SCRATCH_DEV" -o "`_is_block_dev "$SCRATCH_DEV"`" = "" ]
		 then
		     _notrun "this test requires a valid \$SCRATCH_DEV"
		 fi
		 if [ "`_is_block_dev "$SCRATCH_DEV"`" = "`_is_block_dev "$TEST_DEV"`" ]
		 then
		     _notrun "this test requires a valid \$SCRATCH_DEV"
		 fi
		if [ ! -d "$SCRATCH_MNT" ]
		then
		     _notrun "this test requires a valid \$SCRATCH_MNT"
		fi
		 ;;
    esac

    # mounted?
    # Note that we use -F here so grep doesn't try to interpret an NFS over
    # IPv6 server as a regular expression.
    mount_rec=`_mount | grep -F $SCRATCH_DEV`
    if [ "$mount_rec" ]
    then
        # if it's mounted, make sure its on $SCRATCH_MNT
        if ! echo $mount_rec | grep -q $SCRATCH_MNT
        then
            echo "\$SCRATCH_DEV=$SCRATCH_DEV is mounted but not on \$SCRATCH_MNT=$SCRATCH_MNT - aborting"
            echo "Already mounted result:"
            echo $mount_rec
            exit 1
        fi
        # and then unmount it
        if ! _scratch_unmount
        then
            echo "failed to unmount $SCRATCH_DEV"
            exit 1
        fi
    fi
    rm -f ${RESULT_DIR}/require_scratch
}

# we need the scratch device and it should be checked post test.
_require_scratch()
{
	_require_scratch_nocheck
	touch ${RESULT_DIR}/require_scratch
}


# this test needs a test partition - check we're ok & mount it
#
_require_test()
{
    case "$FSTYP" in
	nfs*)
		echo $TEST_DEV | grep -q ":/" > /dev/null 2>&1
		if [ -z "$TEST_DEV" -o "$?" != "0" ]; then
			_notrun "this test requires a valid \$TEST_DIR"
		fi
		if [ ! -d "$TEST_DIR" ]; then
			_notrun "this test requires a valid \$TEST_DIR"
		fi
		;;
	cifs)
		echo $TEST_DEV | grep -q "//" > /dev/null 2>&1
		if [ -z "$TEST_DEV" -o "$?" != "0" ]; then
			_notrun "this test requires a valid \$TEST_DEV"
		fi
		if [ ! -d "$TEST_DIR" ]; then
		     _notrun "this test requires a valid \$TEST_DIR"
		fi
		;;
	overlay)
		if [ -z "$TEST_DEV" -o ! -d "$TEST_DEV" ]; then
			_notrun "this test requires a valid \$TEST_DEV as ovl base dir"
		fi
		if [ ! -d "$TEST_DIR" ]; then
			_notrun "this test requires a valid \$TEST_DIR"
		fi
		;;
	tmpfs)
		if [ -z "$TEST_DEV" -o ! -d "$TEST_DIR" ];
		then
		    _notrun "this test requires a valid \$TEST_DIR and unique $TEST_DEV"
		fi
		;;
	*)
		 if [ -z "$TEST_DEV" ] || [ "`_is_block_dev "$TEST_DEV"`" = "" ]
		 then
		     _notrun "this test requires a valid \$TEST_DEV"
		 fi
		 if [ "`_is_block_dev "$SCRATCH_DEV"`" = "`_is_block_dev "$TEST_DEV"`" ]
		 then
		     _notrun "this test requires a valid \$TEST_DEV"
		 fi
		if [ ! -d "$TEST_DIR" ]
		then
		     _notrun "this test requires a valid \$TEST_DIR"
		fi
		 ;;
    esac

    # mounted?
    # Note that we use -F here so grep doesn't try to interpret an NFS over
    # IPv6 server as a regular expression.
    mount_rec=`_mount | grep -F $TEST_DEV`
    if [ "$mount_rec" ]
    then
        # if it's mounted, make sure its on $TEST_DIR
        if ! echo $mount_rec | grep -q $TEST_DIR
        then
            echo "\$TEST_DEV=$TEST_DEV is mounted but not on \$TEST_DIR=$TEST_DIR - aborting"
            echo "Already mounted result:"
            echo $mount_rec
            exit 1
        fi
    else
	out=`_mount_or_remount_rw "$MOUNT_OPTIONS" $TEST_DEV $TEST_DIR`
	if [ $? -ne 1 ]; then
		echo $out
		exit 1
	fi
    fi
    touch ${RESULT_DIR}/require_test
}

# this test needs a logdev
#
_require_logdev()
{
    [ -z "$SCRATCH_LOGDEV" -o ! -b "$SCRATCH_LOGDEV" ] && \
        _notrun "This test requires a valid \$SCRATCH_LOGDEV"
    [ "$USE_EXTERNAL" != yes ] && \
        _notrun "This test requires USE_EXTERNAL to be enabled"

    # ensure its not mounted
    $UMOUNT_PROG $SCRATCH_LOGDEV 2>/dev/null
}

# this test requires loopback device support
#
_require_loop()
{
    if [ "$HOSTOS" != "Linux" ]
    then
	_notrun "This test requires linux for loopback device support"
    fi

    modprobe loop >/dev/null 2>&1
    if grep loop /proc/devices >/dev/null 2>&1
    then
	:
    else
	_notrun "This test requires loopback device support"
    fi
}

# this test requires ext2 filesystem support
#
_require_ext2()
{
    if [ "$HOSTOS" != "Linux" ]
    then
	_notrun "This test requires linux for ext2 filesystem support"
    fi

    modprobe ext2 >/dev/null 2>&1
    if grep ext2 /proc/filesystems >/dev/null 2>&1
    then
	:
    else
	_notrun "This test requires ext2 filesystem support"
    fi
}

# this test requires that (large) loopback device files are not in use
#
_require_no_large_scratch_dev()
{
    [ "$LARGE_SCRATCH_DEV" = yes ] && \
	_notrun "Large filesystem testing in progress, skipped this test"
}

# this test requires that a realtime subvolume is in use, and
# that the kernel supports realtime as well.
#
_require_realtime()
{
    [ "$USE_EXTERNAL" = yes ] || \
	_notrun "External volumes not in use, skipped this test"
    [ "$SCRATCH_RTDEV" = "" ] && \
	_notrun "Realtime device required, skipped this test"
}

# this test requires that a specified command (executable) exists
# $1 - command, $2 - name for error message
#
# Note: the command string might have parameters, so strip them before checking
# whether it is executable.
_require_command()
{
	if [ $# -eq 2 ]; then
		_name="$2"
	elif [ $# -eq 1 ]; then
		_name="$1"
	else
		_fail "usage: _require_command <command> [<name>]"
	fi

	_command=`echo "$1" | awk '{ print $1 }'`
	if [ ! -x "$_command" ]; then
		_notrun "$_name utility required, skipped this test"
	fi
}

# this test requires the device to be valid block device
# $1 - device
_require_block_device()
{
	if [ -z "$1" ]; then
		echo "Usage: _require_block_device <dev>" 1>&2
		exit 1
	fi
	if [ "`_is_block_dev "$1"`" == "" ]; then
		_notrun "require $1 to be valid block disk"
	fi
}

# brd based ram disks erase the device when they receive a flush command when no
# active references are present. This causes problems for DM devices sitting on
# top of brd devices as DM doesn't hold active references to the brd device.
_require_sane_bdev_flush()
{
	echo $1 | grep -q "^/dev/ram[0-9]\+$"
	if [ $? -eq 0 ]; then
		_notrun "This test requires a sane block device flush"
	fi
}

# this test requires a specific device mapper target
_require_dm_target()
{
	_target=$1

	# require SCRATCH_DEV to be a valid block device with sane BLKFLSBUF
	# behaviour
	_require_block_device $SCRATCH_DEV
	_require_sane_bdev_flush $SCRATCH_DEV
	_require_command "$DMSETUP_PROG" dmsetup

	modprobe dm-$_target >/dev/null 2>&1

	$DMSETUP_PROG targets 2>&1 | grep -q ^$_target
	if [ $? -ne 0 ]; then
		_notrun "This test requires dm $_target support"
	fi
}

# this test requires the projid32bit feature to be available in mkfs.xfs.
#
_require_projid32bit()
{
       _scratch_mkfs_xfs_supported -i projid32bit=1 >/dev/null 2>&1 \
	   || _notrun "mkfs.xfs doesn't have projid32bit feature"
}

_require_projid16bit()
{
	_scratch_mkfs_xfs_supported -i projid32bit=0 >/dev/null 2>&1 \
	   || _notrun "16 bit project IDs not supported on $SCRATCH_DEV"
}

# this test requires the crc feature to be available in mkfs.xfs
#
_require_xfs_mkfs_crc()
{
	_scratch_mkfs_xfs_supported -m crc=1 >/dev/null 2>&1 \
	   || _notrun "mkfs.xfs doesn't have crc feature"
}

# this test requires the xfs kernel support crc feature
#
_require_xfs_crc()
{
	_scratch_mkfs_xfs -m crc=1 >/dev/null 2>&1
	_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support crc feature"
	_scratch_unmount
}

# this test requires the ext4 kernel support crc feature on scratch device
#
_require_scratch_ext4_crc()
{
	_scratch_mkfs_ext4 >/dev/null 2>&1
	dumpe2fs -h $SCRATCH_DEV 2> /dev/null | grep -q metadata_csum || _notrun "metadata_csum not supported by this filesystem"
	_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support metadata_csum feature"
	_scratch_unmount
}

# this test requires the xfs kernel support crc feature on scratch device
#
_require_scratch_xfs_crc()
{
	_scratch_mkfs_xfs >/dev/null 2>&1
	_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support crc feature"
	xfs_info $SCRATCH_MNT | grep -q 'crc=1' || _notrun "crc feature not supported by this filesystem"
	_scratch_unmount
}

# this test requires the bigalloc feature to be available in mkfs.ext4
#
_require_ext4_mkfs_bigalloc()
{
	$MKFS_EXT4_PROG -F -O bigalloc -n $SCRATCH_DEV 512m >/dev/null 2>&1 \
	   || _notrun "mkfs.ext4 doesn't have bigalloc feature"
}

# this test requires the ext4 kernel support bigalloc feature
#
_require_ext4_bigalloc()
{
	$MKFS_EXT4_PROG -F -O bigalloc $SCRATCH_DEV 512m >/dev/null 2>&1
	_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Ext4 kernel doesn't support bigalloc feature"
	_scratch_unmount
}

# this test requires the finobt feature to be available in mkfs.xfs
#
_require_xfs_mkfs_finobt()
{
	_scratch_mkfs_xfs_supported -m crc=1,finobt=1 >/dev/null 2>&1 \
	   || _notrun "mkfs.xfs doesn't have finobt feature"
}

# this test requires the xfs kernel support finobt feature
#
_require_xfs_finobt()
{
	_scratch_mkfs_xfs -m crc=1,finobt=1 >/dev/null 2>&1
	_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support finobt feature"
	_scratch_unmount
}

# this test requires xfs sysfs attribute support
#
_require_xfs_sysfs()
{
	attr=$1
	sysfsdir=/sys/fs/xfs

	if [ ! -e $sysfsdir ]; then
		_notrun "no kernel support for XFS sysfs attributes"
	fi

	if [ ! -z $1 ] && [ ! -e $sysfsdir/$attr ]; then
		_notrun "sysfs attribute '$attr' is not supported"
	fi
}

# this test requires the xfs sparse inode feature
#
_require_xfs_sparse_inodes()
{
	_scratch_mkfs_xfs_supported -m crc=1 -i sparse > /dev/null 2>&1 \
		|| _notrun "mkfs.xfs does not support sparse inodes"
	_scratch_mkfs_xfs -m crc=1 -i sparse > /dev/null 2>&1
	_scratch_mount >/dev/null 2>&1 \
		|| _notrun "kernel does not support sparse inodes"
	_scratch_unmount
}

# this test requires that external log/realtime devices are not in use
#
_require_nonexternal()
{
    [ "$USE_EXTERNAL" = yes ] && \
	_notrun "External device testing in progress, skipped this test"
}

# this test requires that a (specified) aio-dio executable exists
# $1 - command (optional)
#
_require_aiodio()
{
    if [ -z "$1" ]
    then
        AIO_TEST=src/aio-dio-regress/aiodio_sparse2
        [ -x $AIO_TEST ] || _notrun "aio-dio utilities required"
    else
        AIO_TEST=src/aio-dio-regress/$1
        [ -x $AIO_TEST ] || _notrun "$AIO_TEST not built"
    fi
    _require_odirect
}

# this test requires that a test program exists under src/
# $1 - command (require)
#
_require_test_program()
{
    SRC_TEST=src/$1
    [ -x $SRC_TEST ] || _notrun "$SRC_TEST not built"
}

# run an aio-dio program
# $1 - command
_run_aiodio()
{
    if [ -z "$1" ]
    then
        echo "usage: _run_aiodio command_name" 2>&1
        status=1; exit 1
    fi

    _require_aiodio $1

    local testtemp=$TEST_DIR/aio-testfile
    rm -f $testtemp
    $AIO_TEST $testtemp 2>&1
    status=$?
    rm -f $testtemp

    return $status
}

# indicate whether YP/NIS is active or not
#
_yp_active()
{
	local dn
	dn=$(domainname 2>/dev/null)
	test -n "${dn}" -a "${dn}" != "(none)"
	echo $?
}

# cat the password file
#
_cat_passwd()
{
	[ $(_yp_active) -eq 0 ] && ypcat passwd
	cat /etc/passwd
}

# cat the group file
#
_cat_group()
{
	[ $(_yp_active) -eq 0 ] && ypcat group
	cat /etc/group
}

# check for a user on the machine, fsgqa as default
#
_require_user()
{
    qa_user=fsgqa
    if [ -n "$1" ];then
        qa_user=$1
    fi
    _cat_passwd | grep -q $qa_user
    [ "$?" == "0" ] || _notrun "$qa_user user not defined."
    echo /bin/true | su $qa_user
    [ "$?" == "0" ] || _notrun "$qa_user cannot execute commands."
}

# check for a group on the machine, fsgqa as default
#
_require_group()
{
    qa_group=fsgqa
    if [ -n "$1" ];then
        qa_group=$1
    fi
    _cat_group | grep -q $qa_group
    [ "$?" == "0" ] || _notrun "$qa_group user not defined."
}

_filter_user_do()
{
        perl -ne "
s,.*Permission\sdenied.*,Permission denied,;
s,.*no\saccess\sto\stty.*,,;
s,.*no\sjob\scontrol\sin\sthis\sshell.*,,;
s,^\s*$,,;
        print;"
}

_user_do()
{
    if [ "$HOSTOS" == "IRIX" ]
	then
	echo $1 | /bin/bash "su $qa_user 2>&1" | _filter_user_do
    else
	echo $1 | su $qa_user 2>&1 | _filter_user_do
    fi
}

_require_xfs_io_command()
{
	if [ -z "$1" ]
	then
		echo "Usage: _require_xfs_io_command command [switch]" 1>&2
		exit 1
	fi
	command=$1
	shift
	param="$*"

	testfile=$TEST_DIR/$$.xfs_io
	case $command in
	"chproj")
		testio=`$XFS_IO_PROG -F -f -c "chproj 0" $testfile 2>&1`
		;;
	"falloc" )
		testio=`$XFS_IO_PROG -F -f -c "falloc 0 1m" $testfile 2>&1`
		;;
	"fpunch" | "fcollapse" | "zero" | "fzero" | "finsert" )
		testio=`$XFS_IO_PROG -F -f -c "pwrite 0 20k" -c "fsync" \
			-c "$command 4k 8k" $testfile 2>&1`
		;;
	"fiemap")
		testio=`$XFS_IO_PROG -F -f -c "pwrite 0 20k" -c "fsync" \
			-c "fiemap -v" $testfile 2>&1`
		;;
	"flink" )
		testio=`$XFS_IO_PROG -T -F -c "flink $testfile" \
			$TEST_DIR 2>&1`
		echo $testio | egrep -q "invalid option|Is a directory" && \
			_notrun "xfs_io $command support is missing"
		;;
	"fsmap" )
		testio=`$XFS_IO_PROG -f -c "fsmap" $testfile 2>&1`
		echo $testio | egrep -q "Inappropriate ioctl" && \
			_notrun "xfs_io $command support is missing"
		;;
	*)
		testio=`$XFS_IO_PROG -c "$command help" 2>&1`
	esac

	rm -f $testfile 2>&1 > /dev/null
	echo $testio | grep -q "not found" && \
		_notrun "xfs_io $command support is missing"
	echo $testio | grep -q "Operation not supported" && \
		_notrun "xfs_io $command failed (old kernel/wrong fs?)"
	echo $testio | grep -q "foreign file active" && \
		_notrun "xfs_io $command not supported on $FSTYP"

	test -z "$param" && return
	$XFS_IO_PROG -c "help $command" | grep -q "^ $param --" || \
		_notrun "xfs_io $command doesn't support $param"
}

# check that xfs_db supports a specific command
_require_xfs_db_command()
{
	if [ $# -ne 1 ]
	then
		echo "Usage: _require_xfs_db_command command" 1>&2
		exit 1
	fi
	command=$1

	_scratch_xfs_db -x -c "help" | grep $command > /dev/null || \
		_notrun "xfs_db $command support is missing"
}

# check that kernel and filesystem support direct I/O
_require_odirect()
{
	if [ $FSTYP = "ext4" ] ; then
		if echo "$MOUNT_OPTIONS" | grep -q "test_dummy_encryption"; then
			_notrun "ext4 encryption doesn't support O_DIRECT"
		fi
	fi
	testfile=$TEST_DIR/$$.direct
	$XFS_IO_PROG -F -f -d -c "pwrite 0 20k" $testfile > /dev/null 2>&1
	if [ $? -ne 0 ]; then
		_notrun "O_DIRECT is not supported"
	fi
	rm -f $testfile 2>&1 > /dev/null
}

# Check that a fs has enough free space (in 1024b blocks)
#
_require_fs_space()
{
	MNT=$1
	BLOCKS=$2	# in units of 1024
	let GB=$BLOCKS/1024/1024

	FREE_BLOCKS=`df -kP $MNT | grep -v Filesystem | awk '{print $4}'`
	[ $FREE_BLOCKS -lt $BLOCKS ] && \
		_notrun "This test requires at least ${GB}GB free on $MNT to run"
}

#
# Check if the filesystem supports sparse files.
#
# Unfortunately there is no better way to do this than a manual black list.
#
_require_sparse_files()
{
    case $FSTYP in
    hfsplus)
        _notrun "Sparse files not supported by this filesystem type: $FSTYP"
	;;
    *)
        ;;
    esac
}

_require_debugfs()
{
    #boot_params always present in debugfs
    [ -d "$DEBUGFS_MNT/boot_params" ] || _notrun "Debugfs not mounted"
}

_require_fail_make_request()
{
    [ -f "$DEBUGFS_MNT/fail_make_request/probability" ] \
	|| _notrun "$DEBUGFS_MNT/fail_make_request \
 not found. Seems that CONFIG_FAIL_MAKE_REQUEST kernel config option not enabled"
}

#
# Check if the file system supports seek_data/hole
#
_require_seek_data_hole()
{
    testfile=$TEST_DIR/$$.seek
    testseek=`$here/src/seek_sanity_test -t $testfile 2>&1`
    rm -f $testfile &>/dev/null
    echo $testseek | grep -q "Kernel does not support" && \
        _notrun "File system does not support llseek(2) SEEK_DATA/HOLE"
}

_require_runas()
{
	_require_test_program "runas"
}

_runas()
{
	"$here/src/runas" "$@"
}

_require_richacl_prog()
{
	_require_command "$GETRICHACL_PROG" getrichacl
	_require_command "$SETRICHACL_PROG" setrichacl
}

_require_scratch_richacl_xfs()
{
	_scratch_mkfs_xfs_supported -m richacl=1 >/dev/null 2>&1 \
		|| _notrun "mkfs.xfs doesn't have richacl feature"
	_scratch_mkfs_xfs -m richacl=1 >/dev/null 2>&1
	_scratch_mount >/dev/null 2>&1 \
		|| _notrun "kernel doesn't support richacl feature on $FSTYP"
	_scratch_unmount
}

_require_scratch_richacl_ext4()
{
	_scratch_mkfs -O richacl >/dev/null 2>&1 \
		|| _notrun "can't mkfs $FSTYP with option -O richacl"
	_scratch_mount >/dev/null 2>&1 \
		|| _notrun "kernel doesn't support richacl feature on $FSTYP"
	_scratch_unmount
}

_require_scratch_richacl_support()
{
	_scratch_mount
	$GETFATTR_PROG -n system.richacl >/dev/null 2>&1 \
		|| _notrun "this test requires richacl support on \$SCRATCH_DEV"
	_scratch_unmount
}

_require_scratch_richacl()
{
	case "$FSTYP" in
	xfs)    _require_scratch_richacl_xfs
		;;
	ext4)   _require_scratch_richacl_ext4
		;;
	nfs*|cifs|overlay)
		_require_scratch_richacl_support
		;;
	*)      _notrun "this test requires richacl support on \$SCRATCH_DEV"
		;;
	esac
}

_scratch_mkfs_richacl()
{
	case "$FSTYP" in
	xfs)    _scratch_mkfs_xfs -m richacl=1
		;;
	ext4)   _scratch_mkfs -O richacl
		;;
	nfs*|cifs|overlay)
		_scratch_mkfs
		;;
	esac
}

# check that a FS on a device is mounted
# if so, return mount point
#
_is_mounted()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _is_mounted device" 1>&2
	exit 1
    fi

    device=$1

    if _mount | grep "$device " | $AWK_PROG -v pattern="type $FSTYP" '
        pattern        { print $3 ; exit 0 }
        END            { exit 1 }
    '
    then
        echo "_is_mounted: $device is not a mounted $FSTYP FS"
        exit 1
    fi
}

# remount a FS to a new mode (ro or rw)
#
_remount()
{
    if [ $# -ne 2 ]
    then
	echo "Usage: _remount device ro/rw" 1>&2
	exit 1
    fi
    device=$1
    mode=$2

    if ! mount -o remount,$mode $device
    then
        echo "_remount: failed to remount filesystem on $device as $mode"
        exit 1
    fi
}

# Run the appropriate repair/check on a filesystem
#
# if the filesystem is mounted, it's either remounted ro before being
# checked or it's unmounted and then remounted
#

# If set, we remount ro instead of unmounting for fsck
USE_REMOUNT=0

_umount_or_remount_ro()
{
    if [ $# -ne 1 ]
    then
	echo "Usage: _umount_or_remount_ro <device>" 1>&2
	exit 1
    fi

    device=$1
    mountpoint=`_is_mounted $device`

    if [ $USE_REMOUNT -eq 0 ]; then
        $UMOUNT_PROG $device
    else
        _remount $device ro
    fi
    echo "$mountpoint"
}

_mount_or_remount_rw()
{
	if [ $# -ne 3 ]; then
		echo "Usage: _mount_or_remount_rw <opts> <dev> <mnt>" 1>&2
		exit 1
	fi
	mount_opts=$1
	device=$2
	mountpoint=$3

	if [ $USE_REMOUNT -eq 0 ]; then
		if [ "$FSTYP" != "overlay" ]; then
			_mount -t $FSTYP $mount_opts $device $mountpoint
		else
			_overlay_mount $device $mountpoint
		fi
		if [ $? -ne 0 ]; then
			echo "!!! failed to remount $device on $mountpoint"
			return 0 # ok=0
		fi
	else
		_remount $device rw
	fi

	return 1 # ok=1
}

# Check a generic filesystem in no-op mode; this assumes that the
# underlying fsck program accepts "-n" for a no-op (check-only) run,
# and that it will still return an errno for corruption in this mode.
#
# Filesystems which don't support this will need to define their
# own check routine.
#
_check_generic_filesystem()
{
    device=$1

    # If type is set, we're mounted
    type=`_fs_type $device`
    ok=1

    if [ "$type" = "$FSTYP" ]
    then
        # mounted ...
        mountpoint=`_umount_or_remount_ro $device`
    fi

    fsck -t $FSTYP $FSCK_OPTIONS $device >$tmp.fsck 2>&1
    if [ $? -ne 0 ]
    then
        echo "_check_generic_filesystem: filesystem on $device is inconsistent (see $seqres.full)"

        echo "_check_generic filesystem: filesystem on $device is inconsistent" >>$seqres.full
        echo "*** fsck.$FSTYP output ***"	>>$seqres.full
        cat $tmp.fsck				>>$seqres.full
        echo "*** end fsck.$FSTYP output"	>>$seqres.full

        ok=0
    fi
    rm -f $tmp.fsck

    if [ $ok -eq 0 ]
    then
        echo "*** mount output ***"		>>$seqres.full
        _mount					>>$seqres.full
        echo "*** end mount output"		>>$seqres.full
    elif [ "$type" = "$FSTYP" ]
    then
	# was mounted ...
	_mount_or_remount_rw "$MOUNT_OPTIONS" $device $mountpoint
	ok=$?
    fi

    if [ $ok -eq 0 ]; then
	status=1
	if [ "$iam" != "check" ]; then
		exit 1
	fi
	return 1
    fi

    return 0
}

# run xfs_check and friends on a FS.

_check_xfs_filesystem()
{
    if [ $# -ne 3 ]
    then
	echo "Usage: _check_xfs_filesystem device <logdev>|none <rtdev>|none" 1>&2
	exit 1
    fi

    extra_mount_options=""
    extra_log_options=""
    extra_options=""
    device=$1
    if [ -f $device ];then
       extra_options="-f"
    fi

    if [ "$2" != "none" ]; then
	extra_log_options="-l$2"
        extra_mount_options="-ologdev=$2"
    fi

    if [ "$3" != "none" ]; then
	extra_rt_options="-r$3"
        extra_mount_options=$extra_mount_options" -ortdev=$3"
    fi
    extra_mount_options=$extra_mount_options" $MOUNT_OPTIONS"

    [ "$FSTYP" != xfs ] && return 0

    type=`_fs_type $device`
    ok=1

    if [ "$type" = "xfs" ]
    then
        if [ -n "$TEST_XFS_SCRUB" ] && [ -x "$XFS_SCRUB_PROG" ]; then
            "$XFS_SCRUB_PROG" $scrubflag -vd $device >>$seqres.full
            if [ $? -ne 0 ]; then
                echo "filesystem on $device failed scrub (see $seqres.full)"
                ok=0
            fi
        fi
        # mounted ...
        mountpoint=`_umount_or_remount_ro $device`
    fi

    $XFS_LOGPRINT_PROG -t $extra_log_options $device 2>&1 \
                | tee $tmp.logprint | grep -q "<CLEAN>"
    if [ $? -ne 0 -a "$HOSTOS" = "Linux" ]
    then
        echo "_check_xfs_filesystem: filesystem on $device has dirty log (see $seqres.full)"

        echo "_check_xfs_filesystem: filesystem on $device has dirty log"   >>$seqres.full
        echo "*** xfs_logprint -t output ***"	>>$seqres.full
        cat $tmp.logprint			>>$seqres.full
        echo "*** end xfs_logprint output"	>>$seqres.full

        ok=0
    fi

    # xfs_check runs out of memory on large files, so even providing the test
    # option (-t) to avoid indexing the free space trees doesn't make it pass on
    # large filesystems. Avoid it.
    if [ "$LARGE_SCRATCH_DEV" != yes ]; then
	    _xfs_check $extra_log_options $device 2>&1 |\
		 _fix_malloc >$tmp.fs_check
    fi
    if [ -s $tmp.fs_check ]
    then
        echo "_check_xfs_filesystem: filesystem on $device is inconsistent (c) (see $seqres.full)"

        echo "_check_xfs_filesystem: filesystem on $device is inconsistent" >>$seqres.full
        echo "*** xfs_check output ***"		>>$seqres.full
        cat $tmp.fs_check			>>$seqres.full
        echo "*** end xfs_check output"		>>$seqres.full

        ok=0
    fi

    $XFS_REPAIR_PROG -n $extra_options $extra_log_options $extra_rt_options $device >$tmp.repair 2>&1
    if [ $? -ne 0 ]
    then
        echo "_check_xfs_filesystem: filesystem on $device is inconsistent (r) (see $seqres.full)"

        echo "_check_xfs_filesystem: filesystem on $device is inconsistent" >>$seqres.full
        echo "*** xfs_repair -n output ***"	>>$seqres.full
        cat $tmp.repair | _fix_malloc		>>$seqres.full
        echo "*** end xfs_repair output"	>>$seqres.full

        ok=0
    fi
    rm -f $tmp.fs_check $tmp.logprint $tmp.repair

    # Optionally test the index rebuilding behavior.
    if [ -n "$TEST_XFS_REPAIR_REBUILD" ]; then
        $XFS_REPAIR_PROG $extra_options $extra_log_options $extra_rt_options $device >$tmp.repair 2>&1
        if [ $? -ne 0 ]; then
            echo "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild) (see $seqres.full)"

            echo "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild)" >>$seqres.full
            echo "*** xfs_repair output ***"	>>$seqres.full
            cat $tmp.repair | _fix_malloc		>>$seqres.full
            echo "*** end xfs_repair output"	>>$seqres.full

            ok=0
        fi
        rm -f $tmp.repair

        $XFS_REPAIR_PROG -n $extra_options $extra_log_options $extra_rt_options $device >$tmp.repair 2>&1
        if [ $? -ne 0 ]; then
            echo "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild-reverify) (see $seqres.full)"

            echo "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild-reverify)" >>$seqres.full
            echo "*** xfs_repair -n output ***"	>>$seqres.full
            cat $tmp.repair | _fix_malloc		>>$seqres.full
            echo "*** end xfs_repair output"	>>$seqres.full

            ok=0
        fi
        rm -f $tmp.repair
    fi

    if [ $ok -eq 0 ]
    then
        echo "*** mount output ***"		>>$seqres.full
        _mount					>>$seqres.full
        echo "*** end mount output"		>>$seqres.full
    elif [ "$type" = "xfs" ]
    then
	_mount_or_remount_rw "$extra_mount_options" $device $mountpoint
    fi

    if [ $ok -eq 0 ]; then
	status=1
	if [ "$iam" != "check" ]; then
		exit 1
	fi
	return 1
    fi

    return 0
}

# Filter the knowen errors the UDF Verifier reports.
_udf_test_known_error_filter()
{
	egrep -v "PVD  60  Error: Interchange Level: 1, Maximum Interchange Level: 0|FSD  28  Error: Interchange Level: 1, Maximum Interchange Level: 1,|PVD  72  Warning: Volume Set Identifier: \"\*IRIX UDF\",|Warning: [0-9]+ unused blocks NOT marked as unallocated."

}

_check_udf_filesystem()
{
    [ "$DISABLE_UDF_TEST" == "1" ] && return

    if [ $# -ne 1 -a $# -ne 2 ]
    then
	echo "Usage: _check_udf_filesystem device [last_block]" 1>&2
	exit 1
    fi

    if [ ! -x $here/src/udf_test ]
    then
	echo "udf_test not installed, please download and build the Philips"
	echo "UDF Verification Software from http://www.extra.research.philips.com/udf/."
	echo "Then copy the udf_test binary to $here/src/."
	echo "If you do not wish to run udf_test then set environment variable DISABLE_UDF_TEST"
	echo "to 1."
	return
    fi

    device=$1
    if [ $# -eq 2 ];
    then
        LAST_BLOCK=`expr \( $2 - 1 \)`
        OPT_ARG="-lastvalidblock $LAST_BLOCK"
    fi

    rm -f $seqres.checkfs
    sleep 1 # Due to a problem with time stamps in udf_test
    $here/src/udf_test $OPT_ARG $device | tee $seqres.checkfs | egrep "Error|Warning" | \
	_udf_test_known_error_filter | \
	egrep -iv "Error count:.*[0-9]+.*total occurrences:.*[0-9]+|Warning count:.*[0-9]+.*total occurrences:.*[0-9]+" && \
        echo "Warning UDF Verifier reported errors see $seqres.checkfs." && return 1
    return 0
}

_check_xfs_test_fs()
{
    TEST_LOG="none"
    TEST_RT="none"
    [ "$USE_EXTERNAL" = yes -a ! -z "$TEST_LOGDEV" ] && \
        TEST_LOG="$TEST_LOGDEV"

    [ "$USE_EXTERNAL" = yes -a ! -z "$TEST_RTDEV" ] && \
        TEST_RT="$TEST_RTDEV"

    _check_xfs_filesystem $TEST_DEV $TEST_LOG $TEST_RT

    # check for ipath consistency
    if $XFS_GROWFS_PROG -n $TEST_DIR | grep -q 'inode-paths=1'; then
	# errors go to stderr
	xfs_check_ipaths $TEST_DIR >/dev/null
	xfs_repair_ipaths -n $TEST_DIR >/dev/null
    fi
}

_check_btrfs_filesystem()
{
    device=$1

    # If type is set, we're mounted
    type=`_fs_type $device`
    ok=1

    if [ "$type" = "$FSTYP" ]
    then
        # mounted ...
        mountpoint=`_umount_or_remount_ro $device`
    fi

    btrfsck $device >$tmp.fsck 2>&1
    if [ $? -ne 0 ]
    then
        echo "_check_btrfs_filesystem: filesystem on $device is inconsistent (see $seqres.full)"

        echo "_check_btrfs_filesystem: filesystem on $device is inconsistent" >>$seqres.full
        echo "*** fsck.$FSTYP output ***"	>>$seqres.full
        cat $tmp.fsck				>>$seqres.full
        echo "*** end fsck.$FSTYP output"	>>$seqres.full

        ok=0
    fi
    rm -f $tmp.fsck

    if [ $ok -eq 0 ]
    then
        echo "*** mount output ***"		>>$seqres.full
        _mount					>>$seqres.full
        echo "*** end mount output"		>>$seqres.full
    elif [ "$type" = "$FSTYP" ]
    then
	# was mounted ...
	_mount_or_remount_rw "$MOUNT_OPTIONS" $device $mountpoint
	ok=$?
    fi

    if [ $ok -eq 0 ]; then
	status=1
	if [ "$iam" != "check" ]; then
		exit 1
	fi
	return 1
    fi

    return 0
}

_check_test_fs()
{
    case $FSTYP in
    xfs)
	_check_xfs_test_fs
	;;
    nfs)
	# no way to check consistency for nfs
	;;
    cifs)
	# no way to check consistency for cifs
	;;
    overlay)
	# no way to check consistency for overlay
	;;
    udf)
	# do nothing for now
	;;
    btrfs)
	_check_btrfs_filesystem $TEST_DEV
	;;
    tmpfs)
	# no way to check consistency for tmpfs
	;;
    *)
	_check_generic_filesystem $TEST_DEV
	;;
    esac
}

_check_scratch_fs()
{
    device=$SCRATCH_DEV
    [ $# -eq 1 ] && device=$1

    case $FSTYP in
    xfs)
	SCRATCH_LOG="none"
	SCRATCH_RT="none"
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
	    SCRATCH_LOG="$SCRATCH_LOGDEV"

	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ] && \
	    SCRATCH_RT="$SCRATCH_RTDEV"

	_check_xfs_filesystem $device $SCRATCH_LOG $SCRATCH_RT
	;;
    udf)
	_check_udf_filesystem $device $udf_fsize
	;;
    nfs*)
	# Don't know how to check an NFS filesystem, yet.
	;;
    cifs)
	# Don't know how to check a CIFS filesystem, yet.
	;;
    overlay)
	# no way to check consistency for overlay
	;;
    btrfs)
	_check_btrfs_filesystem $device
	;;
    tmpfs)
	# no way to check consistency for tmpfs
	;;
    *)
	_check_generic_filesystem $device
	;;
    esac
}

_full_fstyp_details()
{
     [ -z "$FSTYP" ] && FSTYP=xfs
     if [ $FSTYP = xfs ]; then
	if [ -d /proc/fs/xfs ]; then
	    if grep -q 'debug 0' /proc/fs/xfs/stat; then
		FSTYP="$FSTYP (non-debug)"
	    elif grep -q 'debug 1' /proc/fs/xfs/stat; then
		FSTYP="$FSTYP (debug)"
	    fi
	else
	    if uname -a | grep -qi 'debug'; then
		FSTYP="$FSTYP (debug)"
	    else
		FSTYP="$FSTYP (non-debug)"
	    fi
	fi
     fi
     echo $FSTYP
}

_full_platform_details()
{
     os=`uname -s`
     host=`hostname -s`
     kernel=`uname -r`
     platform=`uname -m`
     echo "$os/$platform $host $kernel"
}

_get_os_name()
{
	if [ "`uname`" == "IRIX64" ] || [ "`uname`" == "IRIX" ]; then
		echo 'irix'
	elif [ "`uname`" == "Linux" ]; then
		echo 'linux'
	else
		echo Unknown operating system: `uname`
		exit
	fi
}

_link_out_file_named()
{
	export FEATURES=$2
	SUFFIX=$(perl -e '
		my %feathash;
		my $feature, $result, $suffix, $opts;

		foreach $feature (split(/,/, $ENV{"FEATURES"})) {
			$feathash{$feature} = 1;
		}
		$result = "default";
		while (<>) {
			my $found = 1;

			chomp;
			($opts, $suffix) = split(/ *: */);
			foreach my $opt (split(/,/, $opts)) {
				if (!exists($feathash{$opt})) {
					$found = 0;
					last;
				}
			}
			if ($found == 1) {
				$result = $suffix;
				last;
			}
		}
		print $result
		' <$seqfull.cfg)
	rm -f $1
	SRC=$(basename $1)
	ln -fs $SRC.$SUFFIX $1
}

_link_out_file()
{
	if [ $# -eq 0 ]; then
		FEATURES="$(_get_os_name)"
		if [ -n "$MOUNT_OPTIONS" ]; then
			FEATURES=$FEATURES,${MOUNT_OPTIONS##"-o "}
		fi
	else
		FEATURES=$1
	fi

	_link_out_file_named $seqfull.out "$FEATURES"
}

_die()
{
        echo $@
        exit 1
}

#takes files, randomdata
_nfiles()
{
        f=0
        while [ $f -lt $1 ]
        do
                file=f$f
                echo > $file
                if [ $size -gt 0 ]; then
                    if [ "$2" == "false" ]; then
                        dd if=/dev/zero of=$file bs=1024 count=$size 2>&1 | _filter_dd
                    else
                        dd if=/dev/urandom of=$file bs=1024 count=$size 2>&1 | _filter_dd
                    fi
                fi
		let f=$f+1
        done
}

# takes dirname, depth, randomdata
_descend()
{
        dirname=$1; depth=$2; randomdata=$3
        mkdir $dirname  || die "mkdir $dirname failed"
        cd $dirname

        _nfiles $files $randomdata          # files for this dir and data type

        [ $depth -eq 0 ] && return
	let deep=$depth-1 # go 1 down

        [ $verbose = true ] && echo "descending, depth from leaves = $deep"

        d=0
        while [ $d -lt $dirs ]
        do
                _descend d$d $deep &
		let d=$d+1
                wait
        done
}

# Populate a filesystem with inodes for performance experiments
#
# usage: populate [-v] [-n ndirs] [-f nfiles] [-d depth] [-r root] [-s size] [-x]
#
_populate_fs()
{
    here=`pwd`
    dirs=5          # ndirs in each subdir till leaves
    size=0          # sizeof files in K
    files=100       # num files in _each_ subdir
    depth=2         # depth of tree from root to leaves
    verbose=false
    root=root       # path of initial root of directory tree
    randomdata=false # -x data type urandom or zero

    OPTIND=1
    while getopts "d:f:n:r:s:v:x" c
    do
        case $c in
        d)      depth=$OPTARG;;
        n)      dirs=$OPTARG;;
        f)      files=$OPTARG;;
        s)      size=$OPTARG;;
        v)      verbose=true;;
        r)      root=$OPTARG;;
        x)      randomdata=true;;
        esac
    done

    _descend $root $depth $randomdata
    wait

    cd $here

    [ $verbose = true ] && echo done
}

# query whether the given file has the given inode flag set
#
_test_inode_flag()
{
    flag=$1
    file=$2

    if which $XFS_IO_PROG >/dev/null; then
        if $XFS_IO_PROG -r -c 'lsattr -v' "$file" | grep -q "$flag" ; then
	    return 0
        fi
    fi
    return 1
}

# query the given files extsize allocator hint in bytes (if any)
#
_test_inode_extsz()
{
    file=$1
    blocks=""

    if which $XFS_IO_PROG >/dev/null; then
	blocks=`$XFS_IO_PROG -r -c 'stat' "$file" | \
		awk '/^xattr.extsize =/ { print $3 }'`
    fi
    [ -z "$blocks" ] && blocks="0"
    echo $blocks
}

# scratch_dev_pool should contain the disks pool for the btrfs raid
_require_scratch_dev_pool()
{
	local i
	local ndevs

	if [ -z "$SCRATCH_DEV_POOL" ]; then
		_notrun "this test requires a valid \$SCRATCH_DEV_POOL"
	fi

	if [ -z "$1" ]; then
		ndevs=2
	else
		ndevs=$1
	fi

	# btrfs test case needs ndevs or more scratch_dev_pool; other FS not sure
	# so fail it
	case $FSTYP in
	btrfs)
		if [ "`echo $SCRATCH_DEV_POOL|wc -w`" -lt $ndevs ]; then
			_notrun "btrfs and this test needs $ndevs or more disks in SCRATCH_DEV_POOL"
		fi
	;;
	*)
		_notrun "dev_pool is not supported by fstype \"$FSTYP\""
	;;
	esac

	for i in $SCRATCH_DEV_POOL; do
		if [ "`_is_block_dev "$i"`" = "" ]; then
			_notrun "this test requires valid block disk $i"
		fi
		if [ "`_is_block_dev "$i"`" = "`_is_block_dev "$TEST_DEV"`" ]; then
			_notrun "$i is part of TEST_DEV, this test requires unique disks"
		fi
		if _mount | grep -q $i; then
			if ! $UMOUNT_PROG $i; then
		            echo "failed to unmount $i - aborting"
		            exit 1
		        fi
		fi
		# to help better debug when something fails, we remove
		# traces of previous btrfs FS on the dev.
		dd if=/dev/zero of=$i bs=4096 count=100 > /dev/null 2>&1
	done
}

# ensure devices in SCRATCH_DEV_POOL are of the same size
# must be called after _require_scratch_dev_pool
_require_scratch_dev_pool_equal_size()
{
	local _size
	local _newsize
	local _dev

	# SCRATCH_DEV has been set to the first device in SCRATCH_DEV_POOL
	_size=`_get_device_size $SCRATCH_DEV`
	for _dev in $SCRATCH_DEV_POOL; do
		_newsize=`_get_device_size $_dev`
		if [ $_size -ne $_newsize ]; then
			_notrun "This test requires devices in SCRATCH_DEV_POOL have the same size"
		fi
	done
}

# We will check if the device is deletable
_require_deletable_scratch_dev_pool()
{
	local i
	local x
	for i in $SCRATCH_DEV_POOL; do
		x=`echo $i | cut -d"/" -f 3`
		if [ ! -f /sys/class/block/${x}/device/delete ]; then
			_notrun "$i is a device which is not deletable"
		fi
	done
}

# We check for btrfs and (optionally) features of the btrfs command
_require_btrfs()
{
	cmd=$1
	_require_command "$BTRFS_UTIL_PROG" btrfs
	if [ -z "$1" ]; then
		return 1;
	fi
	$BTRFS_UTIL_PROG $cmd --help >/dev/null 2>&1
	[ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old (must support $cmd)"
}

# Check that fio is present, and it is able to execute given jobfile
_require_fio()
{
	job=$1

	_require_command "$FIO_PROG" fio
	if [ -z "$1" ]; then
		return 1;
	fi

	$FIO_PROG --warnings-fatal --showcmd $job >> $seqres.full 2>&1
	[ $? -eq 0 ] || _notrun "$FIO_PROG too old, see $seqres.full"
}

# Does freeze work on this fs?
_require_freeze()
{
	xfs_freeze -f "$TEST_DIR" >/dev/null 2>&1
	result=$? 
	xfs_freeze -u "$TEST_DIR" >/dev/null 2>&1
	[ $result -eq 0 ] || _notrun "$FSTYP does not support freezing"
}

# Does shutdown work on this fs?
_require_scratch_shutdown()
{
	[ -x src/godown ] || _notrun "src/godown executable not found"

	_scratch_mkfs > /dev/null 2>&1
	_scratch_mount
	src/godown -f $SCRATCH_MNT 2>&1 \
		|| _notrun "$FSTYP does not support shutdown"
	_scratch_unmount
}

# Does norecovery support by this fs?
_require_norecovery()
{
	_scratch_mount -o ro,norecovery || \
		_notrun "$FSTYP does not support norecovery"
	_scratch_unmount
}

# Does this filesystem support metadata journaling?
# We exclude ones here that don't; otherwise we assume that it does, so the
# test will run, fail, and motivate someone to update this test for a new
# filesystem.
#
# It's possible that TEST_DEV and SCRATCH_DEV have different features (it'd be
# odd, but possible) so check $TEST_DEV by default, but we can optionall pass
# any dev we want.
_require_metadata_journaling()
{
	if [ -z $1 ]; then
		DEV=$TEST_DEV
	else
		DEV=$1
	fi

	case "$FSTYP" in
	ext2|vfat|msdos)
		_notrun "$FSTYP does not support metadata journaling"
		;;
	ext4)
		# ext4 could be mkfs'd without a journal...
		_require_dumpe2fs
		$DUMPE2FS_PROG -h $DEV 2>&1 | grep -q has_journal || \
			_notrun "$FSTYP on $DEV not configured with metadata journaling"
		# ext4 might not load a journal
		_exclude_scratch_mount_option "noload"
		;;
	*)
		# by default we pass; if you need to, add your fs above!
		;;
	esac
}

# Does fiemap support?
_require_fiemap()
{
	_require_xfs_io_command "fiemap"
}

_count_extents()
{
	$XFS_IO_PROG -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l
}

_count_holes()
{
	$XFS_IO_PROG -c "fiemap" $1 | tail -n +2 | grep hole | wc -l
}

# arg 1 is dev to remove and is output of the below eg.
# ls -l /sys/class/block/sdd | rev | cut -d "/" -f 3 | rev
_devmgt_remove()
{
	local lun=$1
	local disk=$2

	echo 1 > /sys/class/scsi_device/${lun}/device/delete || _fail "Remove disk failed"

	stat $disk > /dev/null 2>&1
	while [ $? -eq 0 ]; do
		sleep 1
		stat $disk > /dev/null 2>&1
	done
}

# arg 1 is dev to add and is output of the below eg.
# ls -l /sys/class/block/sdd | rev | cut -d "/" -f 3 | rev
_devmgt_add()
{
	local h
	local tdl
	# arg 1 will be in h:t:d:l format now in the h and "t d l" format
	h=`echo ${1} | cut -d":" -f 1`
	tdl=`echo ${1} | cut -d":" -f 2-|sed 's/:/ /g'`

	echo ${tdl} >  /sys/class/scsi_host/host${h}/scan || _fail "Add disk failed"

	# ensure the device comes online
	dev_back_oneline=0
	for i in `seq 1 10`; do
		if [ -d /sys/class/scsi_device/${1}/device/block ]; then
			dev=`ls /sys/class/scsi_device/${1}/device/block`
			for j in `seq 1 10`;
			do
				stat /dev/$dev > /dev/null 2>&1
				if [ $? -eq 0 ]; then
					dev_back_oneline=1
					break
				fi
				sleep 1
			done
			break
		else
			sleep 1
		fi
	done
	if [ $dev_back_oneline -eq 0 ]; then
		echo "/dev/$dev online failed" >> $seqres.full
	else
		echo "/dev/$dev is back online" >> $seqres.full
	fi
}

_require_fstrim()
{
	if [ -z "$FSTRIM_PROG" ]; then
		_notrun "This test requires fstrim utility."
	fi
}

_require_batched_discard()
{
	if [ $# -ne 1 ]; then
		echo "Usage: _require_batched_discard mnt_point" 1>&2
		exit 1
	fi
	_require_fstrim
	$FSTRIM_PROG $1 > /dev/null 2>&1 || _notrun "FITRIM not supported on $1"
}

_require_dumpe2fs()
{
	if [ -z "$DUMPE2FS_PROG" ]; then
		_notrun "This test requires dumpe2fs utility."
	fi
}

_require_ugid_map()
{
	if [ ! -e /proc/self/uid_map ]; then
		_notrun "This test requires procfs uid_map support."
	fi
	if [ ! -e /proc/self/gid_map ]; then
		_notrun "This test requires procfs gid_map support."
	fi
}

_require_fssum()
{
	FSSUM_PROG=$here/src/fssum
	[ -x $FSSUM_PROG ] || _notrun "fssum not built"
}

_require_cloner()
{
	CLONER_PROG=$here/src/cloner
	[ -x $CLONER_PROG ] || \
		_notrun "cloner binary not present at $CLONER_PROG"
}

# Normalize mount options from global $MOUNT_OPTIONS
# Convert options like "-o opt1,opt2 -oopt3" to
# "opt1 opt2 opt3"
_normalize_mount_options()
{
	echo $MOUNT_OPTIONS | sed -n 's/-o\s*\(\S*\)/\1/gp'| sed 's/,/ /g'
}

# skip test if MOUNT_OPTIONS contains the given strings
_exclude_scratch_mount_option()
{
	local mnt_opts=$(_normalize_mount_options)

	while [ $# -gt 0 ]; do
		if echo $mnt_opts | grep -qw "$1"; then
			_notrun "mount option \"$1\" not allowed in this test"
		fi
		shift
	done
}

_require_atime()
{
	_exclude_scratch_mount_option "noatime"
	if [ "$FSTYP" == "nfs" ]; then
		_notrun "atime related mount options have no effect on NFS"
	fi
}

_require_relatime()
{
        _scratch_mkfs > /dev/null 2>&1
        _scratch_mount -o relatime || \
                _notrun "relatime not supported by the current kernel"
	_scratch_unmount
}

_require_userns()
{
	[ -x src/nsexec ] || _notrun "src/nsexec executable not found"
	src/nsexec -U true 2>/dev/null || _notrun "userns not supported by this kernel"
}

_create_loop_device()
{
	file=$1
	dev=`losetup -f --show $file` || _fail "Cannot assign $file to a loop device"
	echo $dev
}

_destroy_loop_device()
{
	dev=$1
	losetup -d $dev || _fail "Cannot destroy loop device $dev"
}

_scale_fsstress_args()
{
    args=""
    while [ $# -gt 0 ]; do
        case "$1" in
            -n) args="$args $1 $(($2 * $TIME_FACTOR))"; shift ;;
            -p) args="$args $1 $(($2 * $LOAD_FACTOR))"; shift ;;
            *) args="$args $1" ;;
        esac
        shift
    done
    echo $args
}

#
# Return the logical block size if running on a block device,
# else substitute the page size.
#
_min_dio_alignment()
{
    dev=$1

    if [ -b "$dev" ]; then
        blockdev --getss $dev
    else
        $here/src/feature -s
    fi
}

run_check()
{
	echo "# $@" >> $seqres.full 2>&1
	"$@" >> $seqres.full 2>&1 || _fail "failed: '$@'"
}

_run_btrfs_util_prog()
{
	run_check $BTRFS_UTIL_PROG $*
}

_require_btrfs_send_stream_version()
{
	$BTRFS_UTIL_PROG send 2>&1 | \
		grep '^[ \t]*\-\-stream\-version <version>' > /dev/null 2>&1
	if [ $? -ne 0 ]; then
		_notrun "Missing btrfs-progs send --stream-version command line option, skipped this test"
	fi

	# test if btrfs kernel supports send stream version 2
	if [ ! -f /sys/fs/btrfs/send/stream_version ]; then
		_notrun "Missing btrfs kernel patch for send stream version 2, skipped this test"
	fi
}

_require_btrfs_mkfs_feature()
{
	if [ -z $1 ]; then
		echo "Missing feature name argument for _require_btrfs_mkfs_feature"
		exit 1
	fi
	feat=$1
	$MKFS_BTRFS_PROG -O list-all 2>&1 | \
		grep '^[ \t]*'"$feat"'\b' > /dev/null 2>&1
	[ $? -eq 0 ] || \
		_notrun "Feature $feat not supported in the available version of mkfs.btrfs"
}

_require_btrfs_fs_feature()
{
	if [ -z $1 ]; then
		echo "Missing feature name argument for _require_btrfs_fs_feature"
		exit 1
	fi
	feat=$1
	modprobe btrfs > /dev/null 2>&1
	[ -e /sys/fs/btrfs/features/$feat ] || \
		_notrun "Feature $feat not supported by the available btrfs version"
}

_require_test_symlinks()
{
	# IRIX UDF does not support symlinks
	[ "$HOSTOS" = "IRIX" -a "$FSTYP" = 'udf' ] && \
		_notrun "Require symlinks support"
	target=`mktemp -p $TEST_DIR`
	link=`mktemp -p $TEST_DIR -u`
	ln -s `basename $target` $link
	if [ "$?" -ne 0 ]; then
		rm -f $target
		_notrun "Require symlinks support"
	fi
	rm -f $target $link
}

_require_test_fcntl_advisory_locks()
{
	[ "$FSTYP" != "cifs" ] && return 0
	cat /proc/mounts | grep $TEST_DEV | grep cifs | grep -q "nobrl" && return 0
	cat /proc/mounts | grep $TEST_DEV | grep cifs | grep -qE "nounix|forcemand" && \
		_notrun "Require fcntl advisory locks support"
}

# XFS ability to change UUIDs on V5/CRC filesystems
#
_require_meta_uuid()
{
	# This will create a crc fs on $SCRATCH_DEV
	_require_xfs_crc

	_scratch_xfs_db -x -c "uuid restore" 2>&1 \
	   | grep -q "invalid UUID\|supported on V5 fs" \
	   && _notrun "Userspace doesn't support meta_uuid feature"

	_scratch_xfs_db -x -c "uuid generate" >/dev/null 2>&1

	_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support meta_uuid feature"
	_scratch_unmount
}

_require_btrfs_dev_del_by_devid()
{
	$BTRFS_UTIL_PROG device delete --help | egrep devid > /dev/null 2>&1
	[ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old "\
			"(must support 'btrfs device delete <devid> /<mnt>')"
}

_require_test_lsattr()
{
	testio=$(lsattr -d $TEST_DIR 2>&1)
	echo $testio | grep -q "Operation not supported" && \
		_notrun "lsattr not supported by test filesystem type: $FSTYP"
	echo $testio | grep -q "Inappropriate ioctl for device" && \
		_notrun "lsattr not supported by test filesystem type: $FSTYP"
}

_require_xfs_test_rmapbt()
{
	_require_test

	if [ "$(xfs_info "$TEST_DIR" | grep -c "rmapbt=1")" -ne 1 ]; then
		_notrun "rmapbt not supported by test filesystem type: $FSTYP"
	fi
}

_require_xfs_scratch_rmapbt()
{
	_require_scratch

	_scratch_mkfs > /dev/null
	_scratch_mount
	if [ "$(xfs_info "$SCRATCH_MNT" | grep -c "rmapbt=1")" -ne 1 ]; then
		_scratch_unmount
		_notrun "rmapbt not supported by scratch filesystem type: $FSTYP"
	fi
	_scratch_unmount
}

_xfs_bmapx_find() {
	case "$1" in
	"attr")
		param="a"
		;;
	"cow")
		param="c"
		;;
	*)
		param="e"
		;;
	esac
	shift
	file="$1"
	shift

	"$XFS_IO_PROG" -c "bmap -${param}lpv" "$file" | grep -c "$@"
}

_require_chattr()
{
    attribute=$1

    touch $TEST_DIR/syscalltest
    chattr "+$attribute" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
    status=$?
    chattr "-$attribute" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
    if [ "$status" -ne 0 ]; then
      _notrun "file system doesn't support chattr +$attribute"
    fi
    cat $TEST_DIR/syscalltest.out >> $seqres.full

    rm -f $TEST_DIR/syscalltest.out
}

_get_total_inode()
{
	if [ -z "$1" ]; then
		echo "Usage: _get_total_inode <mnt>"
		exit 1
	fi
	local nr_inode;
	nr_inode=`$DF_PROG -i $1 | tail -1 | awk '{print $3}'`
	echo $nr_inode
}

_get_used_inode()
{
	if [ -z "$1" ]; then
		echo "Usage: _get_used_inode <mnt>"
		exit 1
	fi
	local nr_inode;
	nr_inode=`$DF_PROG -i $1 | tail -1 | awk '{print $4}'`
	echo $nr_inode
}

_get_used_inode_percent()
{
	if [ -z "$1" ]; then
		echo "Usage: _get_used_inode_percent <mnt>"
		exit 1
	fi
	local pct_inode;
	pct_inode=`$DF_PROG -i $1 | tail -1 | awk '{ print $6 }' | \
		   sed -e 's/%//'`
	echo $pct_inode
}

_get_free_inode()
{
	if [ -z "$1" ]; then
		echo "Usage: _get_free_inode <mnt>"
		exit 1
	fi
	local nr_inode;
	nr_inode=`$DF_PROG -i $1 | tail -1 | awk '{print $5}'`
	echo $nr_inode
}

# get the available space in bytes
#
_get_available_space()
{
	if [ -z "$1" ]; then
		echo "Usage: _get_available_space <mnt>"
		exit 1
	fi
	local avail_kb;
	avail_kb=`$DF_PROG $1 | tail -n1 | awk '{ print $5 }'`
	echo $((avail_kb * 1024))
}

# get btrfs profile configs being tested
#
# A set of pre-set profile configs are exported via _btrfs_profile_configs
# array. Default configs can be overridden by setting BTRFS_PROFILE_CONFIGS
# var in the format "metadata_profile:data_profile", multiple configs can be
# seperated by space, e.g.
# export BTRFS_PROFILE_CONFIGS="raid0:raid0 raid1:raid1 dup:single"
_btrfs_get_profile_configs()
{
	if [ "$FSTYP" != "btrfs" ]; then
		return
	fi

	if [ -z "$BTRFS_PROFILE_CONFIGS" ]; then
		# Default configurations to test.
		local configs=(
			"single:single"
			"dup:single"
			"raid0:raid0"
			"raid1:raid0"
			"raid1:raid1"
			"raid10:raid10"
			"raid5:raid5"
			"raid6:raid6"
		)
	else
		# User-provided configurations.
		local configs=(${BTRFS_PROFILE_CONFIGS[@]})
	fi

	_btrfs_profile_configs=()
	for cfg in "${configs[@]}"; do
		local supported=true
		local profiles=(${cfg/:/ })
		if [ "$1" == "replace" ]; then
			# We can't do replace with these profiles because they
			# imply only one device ($SCRATCH_DEV), and we need to
			# keep $SCRATCH_DEV around for _scratch_mount
			# and _check_scratch_fs.
			local unsupported=(
				"dup"
			)
		elif [ "$1" == "replace-missing" ]; then
			# We can't replace missing devices with these profiles
			# because there isn't enough redundancy.
			local unsupported=(
				"single"
				"dup"
				"raid0"
			)
		else
			local unsupported=()
		fi
		for unsupp in "${unsupported[@]}"; do
			if [ "${profiles[0]}" == "$unsupp" -o "${profiles[1]}" == "$unsupp" ]; then
			     if [ -z "$BTRFS_PROFILE_CONFIGS" ]; then
				     # For the default config, just omit it.
				     supported=false
			     else
				     # For user-provided config, don't run the test.
				     _notrun "Profile $unsupp not supported for $1"
			     fi
			fi
		done
		if "$supported"; then
			_btrfs_profile_configs+=("-m ${profiles[0]} -d ${profiles[1]}")
		fi
	done
	export _btrfs_profile_configs
}

# stress btrfs by running balance operation in a loop
_btrfs_stress_balance()
{
	local options=$@
	while true; do
		$BTRFS_UTIL_PROG balance start $options
	done
}

# stress btrfs by creating/mounting/umounting/deleting subvolume in a loop
_btrfs_stress_subvolume()
{
	local btrfs_dev=$1
	local btrfs_mnt=$2
	local subvol_name=$3
	local subvol_mnt=$4
	local stop_file=$5

	mkdir -p $subvol_mnt
	while [ ! -e $stop_file ]; do
		$BTRFS_UTIL_PROG subvolume create $btrfs_mnt/$subvol_name
		$MOUNT_PROG -o subvol=$subvol_name $btrfs_dev $subvol_mnt
		$UMOUNT_PROG $subvol_mnt
		$BTRFS_UTIL_PROG subvolume delete $btrfs_mnt/$subvol_name
	done
}

# stress btrfs by running scrub in a loop
_btrfs_stress_scrub()
{
	local btrfs_mnt=$1
	while true; do
		$BTRFS_UTIL_PROG scrub start -B $btrfs_mnt
	done
}

# stress btrfs by defragmenting every file/dir in a loop and compress file
# contents while defragmenting if second argument is not "nocompress"
_btrfs_stress_defrag()
{
	local btrfs_mnt=$1
	local compress=$2

	while true; do
		if [ "$compress" == "nocompress" ]; then
			find $btrfs_mnt \( -type f -o -type d \) -exec \
			$BTRFS_UTIL_PROG filesystem defrag {} \;
		else
			find $btrfs_mnt \( -type f -o -type d \) -exec \
			$BTRFS_UTIL_PROG filesystem defrag -clzo {} \;
			find $btrfs_mnt \( -type f -o -type d \) -exec \
			$BTRFS_UTIL_PROG filesystem defrag -czlib {} \;
		fi
	done
}

# stress btrfs by remounting it with different compression algorithms in a loop
# run this with fsstress running at background could exercise the compression
# code path and ensure no race when switching compression algorithm with constant
# I/O activity.
_btrfs_stress_remount_compress()
{
	local btrfs_mnt=$1
	while true; do
		for algo in no zlib lzo; do
			$MOUNT_PROG -o remount,compress=$algo $btrfs_mnt
		done
	done
}

# stress btrfs by replacing devices in a loop
# Note that at least 3 devices are needed in SCRATCH_DEV_POOL and the last
# device should be free(not used by btrfs)
_btrfs_stress_replace()
{
	local btrfs_mnt=$1

	# The device number in SCRATCH_DEV_POOL should be at least 3,
	# one is SCRATCH_DEV, one is to be replaced, one is free device
	# we won't replace SCRATCH_DEV, see below for reason
	if [ "`echo $SCRATCH_DEV_POOL | wc -w`" -lt 3 ]; then
		echo "_btrfs_stress_replace requires at least 3 devices in SCRATCH_DEV_POOL"
		return
	fi

	# take the last device as the first free_dev
	local free_dev="`echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $NF}'`"

	# free_dev should be really free
	if $BTRFS_UTIL_PROG filesystem show $btrfs_mnt | grep -q "$free_dev"; then
		echo "_btrfs_stress_replace: $free_dev is used by btrfs"
		return
	fi

	# dev_pool is device list being currently used by btrfs (excluding SCRATCH_DEV)
	# and can be replaced. We don't replace SCRATCH_DEV because it will be used in
	# _scratch_mount and _check_scratch_fs etc.
	local dev_pool=`echo $SCRATCH_DEV_POOL | sed -e "s# *$SCRATCH_DEV *##" \
			-e "s# *$free_dev *##"`

	# set the first device in dev_pool as the first src_dev to be replaced
	local src_dev=`echo $dev_pool | $AWK_PROG '{print $1}'`

	echo "dev_pool=$dev_pool"
	echo "free_dev=$free_dev, src_dev=$src_dev"
	while true; do
		echo "Replacing $src_dev with $free_dev"
		$BTRFS_UTIL_PROG replace start -fB $src_dev $free_dev $btrfs_mnt
		if [ $? -ne 0 ]; then
			# don't update src_dev and free_dev if replace failed
			continue
		fi
		dev_pool="$dev_pool $free_dev"
		dev_pool=`echo $dev_pool | sed -e "s# *$src_dev *##"`
		free_dev=$src_dev
		src_dev=`echo $dev_pool | $AWK_PROG '{print $1}'`
	done
}

# find the right option to force output in bytes, older versions of btrfs-progs
# print that by default, newer print human readable numbers with unit suffix
_btrfs_qgroup_units()
{
	$BTRFS_UTIL_PROG qgroup show --help 2>&1 | grep -q -- --raw && echo "--raw"
}

# return device size in kb
_get_device_size()
{
	grep `_short_dev $1` /proc/partitions | awk '{print $3}'
}

# check dmesg log for WARNING/Oops/etc.
_check_dmesg()
{
	if [ ! -f ${RESULT_DIR}/check_dmesg ]; then
		return 0
	fi
	rm -f ${RESULT_DIR}/check_dmesg

	# default filter is a simple cat command, caller could provide a
	# customized filter and pass the name through the first argument, to
	# filter out intentional WARNINGs or Oopses
	filter=${1:-cat}

	# search the dmesg log of last run of $seqnum for possible failures
	# use sed \cregexpc address type, since $seqnum contains "/"
	dmesg | tac | sed -ne "0,\#run fstests $seqnum at $date_time#p" | \
		tac | $filter >$seqres.dmesg
	grep -q -e "kernel BUG at" \
	     -e "WARNING:" \
	     -e "BUG:" \
	     -e "Oops:" \
	     -e "possible recursive locking detected" \
	     -e "Internal error" \
	     -e "INFO: suspicious RCU usage" \
	     -e "INFO: possible circular locking dependency detected" \
	     -e "general protection fault:" \
	     $seqres.dmesg
	if [ $? -eq 0 ]; then
		echo "_check_dmesg: something found in dmesg (see $seqres.dmesg)"
		return 1
	else
		rm -f $seqres.dmesg
		return 0
	fi
}

# don't check dmesg log after test
_disable_dmesg_check()
{
	rm -f ${RESULT_DIR}/check_dmesg
}

init_rc()
{
	if [ "$iam" == new ]
	then
		return
	fi
	# make some further configuration checks here
	if [ "$TEST_DEV" = ""  ]
	then
		echo "common/rc: Error: \$TEST_DEV is not set"
		exit 1
	fi

	# if $TEST_DEV is not mounted, mount it now as XFS
	if [ -z "`_fs_type $TEST_DEV`" ]
	then
		# $TEST_DEV is not mounted
		if ! _test_mount
		then
			echo "common/rc: retrying test device mount with external set"
			[ "$USE_EXTERNAL" != "yes" ] && export USE_EXTERNAL=yes
			if ! _test_mount
			then
				echo "common/rc: could not mount $TEST_DEV on $TEST_DIR"
				exit 1
			fi
		fi
	fi

	if [ "`_fs_type $TEST_DEV`" != "$FSTYP" ]
	then
		echo "common/rc: Error: \$TEST_DEV ($TEST_DEV) is not a MOUNTED $FSTYP filesystem"
		# raw $DF_PROG cannot handle NFS/CIFS/overlay correctly
		_df_device $TEST_DEV
		exit 1
	fi
	# Figure out if we need to add -F ("foreign", deprecated) option to xfs_io
	xfs_io -c stat $TEST_DIR 2>&1 | grep -q "is not on an XFS filesystem" && \
	export XFS_IO_PROG="$XFS_IO_PROG -F"

	# xfs_copy doesn't work on v5 xfs yet without -d option
	if [ "$FSTYP" == "xfs" ] && [[ $MKFS_OPTIONS =~ crc=1 ]]; then
		export XFS_COPY_PROG="$XFS_COPY_PROG -d"
	fi
}

# get real device path name by following link
_real_dev()
{
	local _dev=$1
	if [ -b "$_dev" ] && [ -L "$_dev" ]; then
		_dev=`readlink -f "$_dev"`
	fi
	echo $_dev
}

# basename of a device
_short_dev()
{
	echo `basename $(_real_dev $1)`
}

_sysfs_dev()
{
	local _dev=$1
	local _maj=$(stat -c%t $_dev | tr [:lower:] [:upper:])
	local _min=$(stat -c%T $_dev | tr [:lower:] [:upper:])
	_maj=$(echo "ibase=16; $_maj" | bc)
	_min=$(echo "ibase=16; $_min" | bc)
	echo /sys/dev/block/$_maj:$_min
}

get_block_size()
{
	if [ -z $1 ] || [ ! -d $1 ]; then
		echo "Missing mount point argument for get_block_size"
		exit 1
	fi
	echo `stat -f -c %S $1`
}

get_page_size()
{
	echo $(getconf PAGE_SIZE)
}


run_fsx()
{
	echo fsx $@
	args=`echo $@ | sed -e "s/ BSIZE / $bsize /g" -e "s/ PSIZE / $psize /g"`
	set -- $here/ltp/fsx $args $FSX_AVOID $TEST_DIR/junk
	echo "$@" >>$seqres.full
	rm -f $TEST_DIR/junk
	"$@" 2>&1 | tee -a $seqres.full >$tmp.fsx
	if [ ${PIPESTATUS[0]} -ne 0 ]; then
		cat $tmp.fsx
		exit 1
	fi
}

# Test for the existence of a sysfs entry at /sys/fs/$FSTYP/DEV/$ATTR
#
# Only one argument is needed:
#  - attr: path name under /sys/fs/$FSTYP/DEV
#
# Usage example:
#   _require_fs_sysfs error/fail_at_unmount
_require_fs_sysfs()
{
	local attr=$1
	local dname=$(_short_dev $TEST_DEV)

	if [ -z "$attr" -o -z "$dname" ];then
		_fail "Usage: _require_fs_sysfs <sysfs_attr_path>"
	fi

	if [ ! -e /sys/fs/${FSTYP}/${dname}/${attr} ];then
		_notrun "This test requires /sys/fs/${FSTYP}/${dname}/${attr}"
	fi
}

# Write "content" into /sys/fs/$FSTYP/$DEV/$ATTR
#
# All arguments are necessary, and in this order:
#  - dev: device name, e.g. $SCRATCH_DEV
#  - attr: path name under /sys/fs/$FSTYP/$dev
#  - content: the content of $attr
#
# Usage example:
#   _set_fs_sysfs_attr /dev/mapper/scratch-dev error/fail_at_unmount 0
_set_fs_sysfs_attr()
{
	local dev=$1
	shift
	local attr=$1
	shift
	local content="$*"

	if [ ! -b "$dev" -o -z "$attr" -o -z "$content" ];then
		_fail "Usage: _set_fs_sysfs_attr <mounted_device> <attr> <content>"
	fi

	local dname=$(_short_dev $dev)
	echo "$content" > /sys/fs/${FSTYP}/${dname}/${attr}
}

# Print the content of /sys/fs/$FSTYP/$DEV/$ATTR
#
# All arguments are necessary, and in this order:
#  - dev: device name, e.g. $SCRATCH_DEV
#  - attr: path name under /sys/fs/$FSTYP/$dev
#
# Usage example:
#   _get_fs_sysfs_attr /dev/mapper/scratch-dev error/fail_at_unmount
_get_fs_sysfs_attr()
{
	local dev=$1
	local attr=$2

	if [ ! -b "$dev" -o -z "$attr" ];then
		_fail "Usage: _get_fs_sysfs_attr <mounted_device> <attr>"
	fi

	local dname=$(_short_dev $dev)
	cat /sys/fs/${FSTYP}/${dname}/${attr}
}


# Reset all xfs error handling attributes, set them to original
# status.
#
# Only one argument, and it's mandatory:
#  - dev: device name, e.g. $SCRATCH_DEV
#
# Note: this function only works for XFS
_reset_xfs_sysfs_error_handling()
{
	local dev=$1

	if [ ! -b "$dev" -o "$FSTYP" != "xfs" ];then
		_fail "Usage: reset_xfs_sysfs_error_handling <device>"
	fi

	_set_fs_sysfs_attr $dev error/fail_at_unmount 1
	echo -n "error/fail_at_unmount="
	_get_fs_sysfs_attr $dev error/fail_at_unmount

	# Make sure all will be configured to retry forever by default, except
	# for ENODEV, which is an unrecoverable error, so it will be configured
	# to not retry on error by default.
	for e in default EIO ENOSPC; do
		_set_fs_sysfs_attr $dev \
				   error/metadata/${e}/max_retries -1
		echo -n "error/metadata/${e}/max_retries="
		_get_fs_sysfs_attr $dev error/metadata/${e}/max_retries

		_set_fs_sysfs_attr $dev \
				   error/metadata/${e}/retry_timeout_seconds 0
		echo -n "error/metadata/${e}/retry_timeout_seconds="
		_get_fs_sysfs_attr $dev \
				   error/metadata/${e}/retry_timeout_seconds
	done
}

# Skip if we are running an older binary without the stricter input checks.
# Make multiple checks to be sure that there is no regression on the one
# selected feature check, which would skew the result.
#
# At first, make a common function that runs the tests and returns
# number of failed cases.
_xfs_mkfs_validation_check()
{
	local tmpfile=`mktemp`
	local cmd="$MKFS_XFS_PROG -f -N -d file,name=$tmpfile,size=1g"

	$cmd -s size=2s >/dev/null 2>&1
	local sum=$?

	$cmd -l version=2,su=260k >/dev/null 2>&1
	sum=`expr $sum + $?`

	rm -f $tmpfile
	return $sum
}

# Skip the test if all calls passed - mkfs accepts invalid input
_require_xfs_mkfs_validation()
{
	_xfs_mkfs_validation_check
	if [ "$?" -eq 0 ]; then
		_notrun "Requires newer mkfs with stricter input checks: the oldest supported version of xfsprogs is 4.7."
	fi
}

# The oposite of _require_xfs_mkfs_validation.
_require_xfs_mkfs_without_validation()
{
	_xfs_mkfs_validation_check
	if [ "$?" -ne 0 ]; then
		_notrun "Requires older mkfs without strict input checks: the last supported version of xfsprogs is 4.5."
	fi
}

init_rc

################################################################################
# make sure this script returns success
/bin/true
