path: root/common/xfs

#
# XFS specific common functions.
#

_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
	_try_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

	echo "$MKFS_XFS_PROG $SCRATCH_OPTIONS $mkfs_opts"
}


_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
}

# Returns the minimum XFS log size, in units of log blocks.
_scratch_find_xfs_min_logblocks()
{
	local mkfs_cmd="`_scratch_mkfs_xfs_opts`"

	# The smallest log size we can specify is 2M (XFS_MIN_LOG_BYTES) so
	# pass that in and see if mkfs succeeds or tells us what is the
	# minimum log size.
	local XFS_MIN_LOG_BYTES=2097152

	# Try formatting the filesystem with all the options given and the
	# minimum log size.  We hope either that this succeeds or that mkfs
	# tells us the required minimum log size for the feature set.
	#
	# We cannot use _scratch_do_mkfs because it will retry /any/ failed
	# mkfs with MKFS_OPTIONS removed even if the only "failure" was that
	# the log was too small.
	local extra_mkfs_options="$* -N -l size=$XFS_MIN_LOG_BYTES"
	eval "$mkfs_cmd $MKFS_OPTIONS $extra_mkfs_options $SCRATCH_DEV" \
		2>$tmp.mkfserr 1>$tmp.mkfsstd
	local mkfs_status=$?

	# If the format fails for a reason other than the log being too small,
	# try again without MKFS_OPTIONS because that's what _scratch_do_mkfs
	# will do if we pass in the log size option.
	if [ $mkfs_status -ne 0 ] &&
	   ! egrep -q '(log size.*too small, minimum|external log device.*too small, must be)' $tmp.mkfserr; then
		eval "$mkfs_cmd $extra_mkfs_options $SCRATCH_DEV" \
			2>$tmp.mkfserr 1>$tmp.mkfsstd
		mkfs_status=$?
	fi

	# mkfs suceeded, so we must pick out the log block size to do the
	# unit conversion
	if [ $mkfs_status -eq 0 ]; then
		blksz="$(grep '^log.*bsize' $tmp.mkfsstd | \
			sed -e 's/log.*bsize=\([0-9]*\).*$/\1/g')"
		echo $((XFS_MIN_LOG_BYTES / blksz))
		rm -f $tmp.mkfsstd $tmp.mkfserr
		return
	fi

	# Usually mkfs will tell us the minimum log size...
	if grep -q 'minimum size is' $tmp.mkfserr; then
		grep 'minimum size is' $tmp.mkfserr | \
			sed -e 's/^.*minimum size is \([0-9]*\) blocks/\1/g'
		rm -f $tmp.mkfsstd $tmp.mkfserr
		return
	fi
	if grep -q 'external log device.*too small, must be' $tmp.mkfserr; then
		grep 'external log device.*too small, must be' $tmp.mkfserr | \
			sed -e 's/^.*must be at least \([0-9]*\) blocks/\1/g'
		rm -f $tmp.mkfsstd $tmp.mkfserr
		return
	fi

	# Don't know what to do, so fail
	echo "Cannot determine minimum log size" >&2
	cat $tmp.mkfsstd >> $seqres.full
	cat $tmp.mkfserr >> $seqres.full
	rm -f $tmp.mkfsstd $tmp.mkfserr
}

_scratch_mkfs_xfs()
{
	local mkfs_cmd="`_scratch_mkfs_xfs_opts`"
	local mkfs_filter="sed -e '/less than device physical sector/d' \
			       -e '/switching to logical sector/d' \
			       -e '/Default configuration/d'"
	local tmp=`mktemp -u`
	local mkfs_status

	_scratch_do_mkfs "$mkfs_cmd" "$mkfs_filter" $* 2>$tmp.mkfserr 1>$tmp.mkfsstd
	mkfs_status=$?

	grep -q crc=0 $tmp.mkfsstd && _force_xfsv4_mount_options

	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.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 mkfs stdout and stderr
	cat $tmp.mkfsstd
	cat $tmp.mkfserr >&2
	rm -f $tmp.mkfserr $tmp.mkfsstd

	return $mkfs_status
}

# Get the size of an allocation unit of a file.  Normally this is just the
# block size of the file, but for realtime files, this is the realtime extent
# size.
_xfs_get_file_block_size()
{
	local path="$1"

	if ! ($XFS_IO_PROG -c "stat -v" "$path" 2>&1 | egrep -q '(rt-inherit|realtime)'); then
		_get_block_size "$path"
		return
	fi

	# Otherwise, call xfs_info until we find a mount point or the root.
	path="$(readlink -m "$path")"
	while ! $XFS_INFO_PROG "$path" &>/dev/null && [ "$path" != "/" ]; do
		path="$(dirname "$path")"
	done
	$XFS_INFO_PROG "$path" | grep realtime | sed -e 's/^.*extsz=\([0-9]*\).*$/\1/g'
}

# Set or clear the realtime status of every supplied path.  The first argument
# is either 'data' or 'realtime'.  All other arguments should be paths to
# existing directories or empty regular files.
#
# For each directory, each file subsequently created will target the given
# device for file data allocations.  For each empty regular file, each
# subsequent file data allocation will be on the given device.
_xfs_force_bdev()
{
	local device="$1"
	shift
	local chattr_arg=""

	case "$device" in
	"data")		chattr_arg="-t";;
	"realtime")	chattr_arg="+t";;
	*)
		echo "${device}: Don't know what device this is?"
		return 1
		;;
	esac

	$XFS_IO_PROG -c "chattr $chattr_arg" "$@"
}

_xfs_get_fsxattr()
{
	local field="$1"
	local path="$2"

	local value=$($XFS_IO_PROG -c "stat" "$path" | grep -w "$field")
	echo ${value##fsxattr.${field} = }
}

# 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"

	OPTIND=1
	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
}

_scratch_xfs_options()
{
    local type=$1
    local rt_opt=""
    local log_opt=""

    case $type in
    mkfs)
	SCRATCH_OPTIONS="$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"
}

_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)
}

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

_test_xfs_db()
{
	$XFS_DB_PROG "$@" $(_test_xfs_db_options)
}

_scratch_xfs_admin()
{
	local options=("$SCRATCH_DEV")
	local rt_opts=()
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		options+=("$SCRATCH_LOGDEV")
	if [ "$USE_EXTERNAL" = yes ] && [ -n "$SCRATCH_RTDEV" ]; then
		$XFS_ADMIN_PROG --help 2>&1 | grep -q 'rtdev' || \
			_notrun 'xfs_admin does not support rt devices'
		rt_opts+=(-r "$SCRATCH_RTDEV")
	fi

	# xfs_admin in xfsprogs 5.11 has a bug where an external log device
	# forces xfs_db to be invoked, potentially with zero command arguments.
	# When this happens, xfs_db will wait for input on stdin, which causes
	# fstests to hang.  Since xfs_admin is not an interactive tool, we
	# can redirect stdin from /dev/null to prevent this issue.
	$XFS_ADMIN_PROG "${rt_opts[@]}" "$@" "${options[@]}" < /dev/null
}

_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
}

# Check for secret debugging hooks in xfs_repair
_require_libxfs_debug_flag() {
	local hook="$1"

	grep -q "$hook" "$(type -P xfs_repair)" || \
		_notrun "libxfs debug hook $hook not detected?"
}

_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"
	$XFS_REPAIR_PROG $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

# 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
	_try_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support crc 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
	_try_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support crc feature"
	$XFS_INFO_PROG $SCRATCH_MNT | grep -q 'crc=1' || _notrun "crc feature not supported by this filesystem"
	_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
	_try_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
	_try_scratch_mount >/dev/null 2>&1 \
		|| _notrun "kernel does not support sparse inodes"
	_scratch_unmount
}

# this test requires the xfs large extent counter feature
#
_require_xfs_nrext64()
{
	_scratch_mkfs_xfs_supported -m crc=1 -i nrext64 > /dev/null 2>&1 \
		|| _notrun "mkfs.xfs does not support nrext64"
	_scratch_mkfs_xfs -m crc=1 -i nrext64 > /dev/null 2>&1
	_try_scratch_mount >/dev/null 2>&1 \
		|| _notrun "kernel does not support nrext64"
	_scratch_unmount
}

# 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_mkfs_xfs >/dev/null 2>&1
	_scratch_xfs_db -x -c "help" | grep $command > /dev/null || \
		_notrun "xfs_db $command support is missing"
}

# Does the filesystem mounted from a particular device support scrub?
_supports_xfs_scrub()
{
	local mountpoint="$1"
	local device="$2"

	if [ -z "$device" ] || [ -z "$mountpoint" ]; then
		echo "Usage: _supports_xfs_scrub mountpoint device"
		return 1
	fi

	if [ ! -b "$device" ] || [ ! -e "$mountpoint" ]; then
		return 1
	fi

	test "$FSTYP" = "xfs" || return 1
	test -x "$XFS_SCRUB_PROG" || return 1

	# Probe for kernel support...
	$XFS_IO_PROG -c 'help scrub' 2>&1 | grep -q 'types are:.*probe' || return 1
	$XFS_IO_PROG -c "scrub probe" "$mountpoint" 2>&1 | grep -q "Inappropriate ioctl" && return 1

	# Scrub can't run on norecovery mounts
	_fs_options "$device" | grep -q "norecovery" && return 1

	return 0
}

# Save a snapshot of a corrupt xfs filesystem for later debugging.
_xfs_metadump() {
	local metadump="$1"
	local device="$2"
	local logdev="$3"
	local compressopt="$4"
	shift; shift; shift; shift
	local options="$@"
	test -z "$options" && options="-a -o"

	if [ "$logdev" != "none" ]; then
		options="$options -l $logdev"
	fi

	$XFS_METADUMP_PROG $options "$device" "$metadump"
	res=$?
	[ "$compressopt" = "compress" ] && [ -n "$DUMP_COMPRESSOR" ] &&
		$DUMP_COMPRESSOR -f "$metadump" &> /dev/null
	return $res
}

# Snapshot the metadata on the scratch device
_scratch_xfs_metadump()
{
	local metadump=$1
	shift
	local logdev=none

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

	_xfs_metadump "$metadump" "$SCRATCH_DEV" "$logdev" nocompress "$@"
}

# 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

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

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

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

	type=`_fs_type $device`
	ok=1

	# Run online scrub if we can.
	mntpt="$(_is_dev_mounted $device)"
	if [ -n "$mntpt" ] && _supports_xfs_scrub "$mntpt" "$device"; then
		# Tests can create a scenario in which a call to syncfs() issued
		# at the end of the execution of the test script would return an
		# error code. xfs_scrub internally calls syncfs() before
		# starting the actual online consistency check operation. Since
		# such a call to syncfs() fails, xfs_scrub ends up returning
		# without performing consistency checks on the test
		# filesystem. This can mask a possible on-disk data structure
		# corruption. Hence consume such a possible syncfs() failure
		# before executing a scrub operation.
		$XFS_IO_PROG -c syncfs $mntpt >> $seqres.full 2>&1

		"$XFS_SCRUB_PROG" -v -d -n $mntpt > $tmp.scrub 2>&1
		if [ $? -ne 0 ]; then
			_log_err "_check_xfs_filesystem: filesystem on $device failed scrub"
			echo "*** xfs_scrub -v -d -n output ***" >> $seqres.full
			cat $tmp.scrub >> $seqres.full
			echo "*** end xfs_scrub output" >> $seqres.full
			ok=0
		fi
		rm -f $tmp.scrub
	fi

	if [ "$type" = "xfs" ]; then
		# 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 ]; then
		_log_err "_check_xfs_filesystem: filesystem on $device has dirty log"
		echo "*** xfs_logprint -t output ***"	>>$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.
	#
	# As of August 2021, xfs_repair completely supersedes xfs_check's
	# ability to find corruptions, so we no longer run xfs_check unless
	# forced to run it.
	if [ "$LARGE_SCRATCH_DEV" != yes ] && [ "$FORCE_XFS_CHECK_PROG" = "yes" ]; then
		_xfs_check $extra_log_options $device 2>&1 > $tmp.fs_check
	fi
	if [ -s $tmp.fs_check ]; then
		_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (c)"
		echo "*** xfs_check output ***"		>>$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
		_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (r)"
		echo "*** xfs_repair -n output ***"	>>$seqres.full
		cat $tmp.repair				>>$seqres.full
		echo "*** end xfs_repair output"	>>$seqres.full

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

	if [ "$ok" -ne 1 ] && [ "$DUMP_CORRUPT_FS" = "1" ]; then
		local flatdev="$(basename "$device")"
		_xfs_metadump "$seqres.$flatdev.check.md" "$device" "$logdev" \
			compress >> $seqres.full
	fi

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

			ok=0
			rebuild_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
			_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild-reverify)"
			echo "*** xfs_repair -n output ***"	>>$seqres.full
			cat $tmp.repair				>>$seqres.full
			echo "*** end xfs_repair output"	>>$seqres.full

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

		if [ "$rebuild_ok" -ne 1 ] && [ "$DUMP_CORRUPT_FS" = "1" ]; then
			local flatdev="$(basename "$device")"
			_xfs_metadump "$seqres.$flatdev.rebuild.md" "$device" \
				"$logdev" compress >> $seqres.full
		fi
	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
}

_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
	return $?
}

_require_xfs_test_rmapbt()
{
	_require_test

	if [ "$($XFS_INFO_PROG "$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_PROG "$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" "$file" | grep -c "$@"
}

# 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 -1
		echo -n "error/metadata/${e}/retry_timeout_seconds="
		_get_fs_sysfs_attr $dev \
				   error/metadata/${e}/retry_timeout_seconds
	done
}

# Unmount an XFS with a dirty log
_scratch_xfs_unmount_dirty()
{
	local f="$SCRATCH_MNT/.dirty_umount"

	rm -f "$f"
	echo "test" > "$f"
	sync
	_scratch_shutdown
	_scratch_unmount
}

# Prepare a mounted filesystem for an IO error shutdown test by disabling retry
# for metadata writes.  This prevents a (rare) log livelock when:
#
# - The log has given out all available grant space, preventing any new
#   writers from tripping over IO errors (and shutting down the fs/log),
# - All log buffers were written to disk, and
# - The log tail is pinned because the AIL keeps hitting EIO trying to write
#   committed changes back into the filesystem.
#
# Real users might want the default behavior of the AIL retrying writes forever
# but for testing purposes we don't want to wait.
#
# The sole parameter should be the filesystem data device, e.g. $SCRATCH_DEV.
_xfs_prepare_for_eio_shutdown()
{
	local dev="$1"
	local ctlfile="error/fail_at_unmount"

	# Don't retry any writes during the (presumably) post-shutdown unmount
	_has_fs_sysfs "$ctlfile" && _set_fs_sysfs_attr $dev "$ctlfile" 1

	# Disable retry of metadata writes that fail with EIO
	for ctl in max_retries retry_timeout_seconds; do
		ctlfile="error/metadata/EIO/$ctl"

		_has_fs_sysfs "$ctlfile" && _set_fs_sysfs_attr $dev "$ctlfile" 0
	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"

	$cmd -s size=8s >/dev/null 2>&1
	local sum=$?

	$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 opposite 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
}

_require_scratch_xfs_shrink()
{
	_require_scratch
	_require_command "$XFS_GROWFS_PROG" xfs_growfs

	_scratch_mkfs_xfs | _filter_mkfs 2>$tmp.mkfs >/dev/null
	. $tmp.mkfs
	_scratch_mount
	# here just to check if kernel supports, no need do more extra work
	local errmsg
	errmsg=$($XFS_GROWFS_PROG -D$((dblocks-1)) "$SCRATCH_MNT" 2>&1)
	if [ "$?" -ne 0 ]; then
		echo "$errmsg" | grep 'XFS_IOC_FSGROWFSDATA xfsctl failed: Invalid argument' > /dev/null && \
			_notrun "kernel does not support shrinking"
		echo "$errmsg" | grep 'data size .* too small, old size is ' > /dev/null && \
			_notrun "xfsprogs does not support shrinking"
		_fail "$XFS_GROWFS_PROG failed unexpectedly: $errmsg"
	fi
	_scratch_unmount
}

# 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

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

# this test requires mkfs.xfs have case-insensitive naming support
_require_xfs_mkfs_ciname()
{
	_scratch_mkfs_xfs_supported -n version=ci >/dev/null 2>&1 \
		|| _notrun "need case-insensitive naming support in mkfs.xfs"
}

# this test requires mkfs.xfs have configuration file support
_require_xfs_mkfs_cfgfile()
{
	echo > /tmp/a
	_scratch_mkfs_xfs_supported -c options=/tmp/a >/dev/null 2>&1
	res=$?
	rm -rf /tmp/a
	test $res -eq 0 || _notrun "need configuration file support in mkfs.xfs"
}

# XFS_DEBUG requirements
_require_xfs_debug()
{
	if grep -q "debug 0" /proc/fs/xfs/stat; then
		_notrun "Require XFS built with CONFIG_XFS_DEBUG"
	fi
}
_require_no_xfs_debug()
{
	if grep -q "debug 1" /proc/fs/xfs/stat; then
		_notrun "Require XFS built without CONFIG_XFS_DEBUG"
	fi
}

# Require that assertions will not crash the system.
#
# Assertions would always crash the system if XFS assert fatal was enabled
# (CONFIG_XFS_ASSERT_FATAL=y).  If a test is designed to trigger an assertion,
# skip the test on a CONFIG_XFS_ASSERT_FATAL built XFS by default.  Note:
# CONFIG_XFS_ASSERT_FATAL can be disabled by setting bug_on_assert to zero if
# we want test to run.
_require_no_xfs_bug_on_assert()
{
	if [ -f /sys/fs/xfs/debug/bug_on_assert ]; then
		grep -q "1" /sys/fs/xfs/debug/bug_on_assert && \
		   _notrun "test requires XFS bug_on_assert to be off, turn it off to run the test"
	else
		# Note: Prior to the creation of CONFIG_XFS_ASSERT_FATAL (and
		# the sysfs knob bug_on_assert), assertions would always crash
		# the system if XFS debug was enabled (CONFIG_XFS_DEBUG=y).  If
		# a test is designed to trigger an assertion and the test
		# designer does not want to hang fstests, skip the test.
		_require_no_xfs_debug
	fi
}

# Get a metadata field
# The first arg is the field name
# The rest of the arguments are xfs_db commands to find the metadata.
_scratch_xfs_get_metadata_field()
{
	local key="$1"
	shift

	local grep_key="$(echo "${key}" | tr '[]()' '....')"
	local cmds=()
	local arg
	for arg in "$@"; do
		cmds+=("-c" "${arg}")
	done
	_scratch_xfs_db "${cmds[@]}" -c "print ${key}" | grep "^${grep_key}" | \
		sed -e 's/^.* = //g'
}

# Set a metadata field
# The first arg is the field name
# The second arg is the new value
# The rest of the arguments are xfs_db commands to find the metadata.
_scratch_xfs_set_metadata_field()
{
	local key="$1"
	local value="$2"
	shift; shift

	local cmds=()
	local arg
	for arg in "$@"; do
		cmds+=("-c" "${arg}")
	done

	local wr_cmd="write"
	_scratch_xfs_db -x -c "help write" | egrep -q "(-c|-d)" && value="-- ${value}"
	_scratch_xfs_db -x -c "help write" | egrep -q "(-d)" && wr_cmd="${wr_cmd} -d"
	_scratch_xfs_db -x "${cmds[@]}" -c "${wr_cmd} ${key} ${value}"
}

_scratch_xfs_get_sb_field()
{
	_scratch_xfs_get_metadata_field "$1" "sb 0"
}

_scratch_xfs_set_sb_field()
{
	_scratch_xfs_set_metadata_field "$1" "$2" "sb 0"
}

# Before xfsprogs commit 4222d000ed("db: write via array indexing doesn't
# work"), xfs_db command to write a specific AGFL index doesn't work. It's a
# bug in a diagnostic tool that is only used by XFS developers as a test
# infrastructure, so it's fine to treat it as a infrastructure dependency as
# all other _require rules.
_require_xfs_db_write_array()
{
	local supported=0

	_require_test
	touch $TEST_DIR/$seq.img
	$MKFS_XFS_PROG -d file,name=$TEST_DIR/$seq.img,size=512m >/dev/null 2>&1
	$XFS_DB_PROG -x -c "agfl 0" -c "write bno[32] 78" $TEST_DIR/$seq.img \
		>/dev/null 2>&1
	$XFS_DB_PROG -x -c "agfl 0" -c "print bno[32]" $TEST_DIR/$seq.img \
		| grep -q "bno\[32\] = 78" && supported=1
	rm -f $TEST_DIR/$seq.img
	[ $supported -eq 0 ] && _notrun "xfs_db write can't support array"
}

_require_xfs_spaceman_command()
{
	if [ -z "$1" ]; then
		echo "Usage: _require_xfs_spaceman_command command [switch]" 1>&2
		exit 1
	fi
	local command=$1
	shift
	local param="$*"
	local param_checked=0
	local opts=""

	_require_command "$XFS_SPACEMAN_PROG" "xfs_spaceman"

	testfile=$TEST_DIR/$$.xfs_spaceman
	touch $testfile
	case $command in
	"health")
		testio=`$XFS_SPACEMAN_PROG -c "health $param" $TEST_DIR 2>&1`
		param_checked=1
		;;
	*)
		testio=`$XFS_SPACEMAN_PROG -c "help $command" $TEST_DIR 2>&1`
	esac

	rm -f $testfile 2>&1 > /dev/null
	echo $testio | grep -q "not found" && \
		_notrun "xfs_spaceman $command support is missing"
	echo $testio | grep -q "Operation not supported" && \
		_notrun "xfs_spaceman $command failed (old kernel/wrong fs?)"
	echo $testio | grep -q "Invalid" && \
		_notrun "xfs_spaceman $command failed (old kernel/wrong fs/bad args?)"
	echo $testio | grep -q "foreign file active" && \
		_notrun "xfs_spaceman $command not supported on $FSTYP"
	echo $testio | grep -q "Inappropriate ioctl for device" && \
		_notrun "xfs_spaceman $command support is missing (missing ioctl?)"
	echo $testio | grep -q "Function not implemented" && \
		_notrun "xfs_spaceman $command support is missing (missing syscall?)"

	[ -n "$param" ] || return

	if [ $param_checked -eq 0 ]; then
		$XFS_SPACEMAN_PROG -c "help $command" | grep -q "^ $param --" || \
			_notrun "xfs_spaceman $command doesn't support $param"
	fi
}

_scratch_get_sfdir_prefix() {
	local dir_ino="$1"

	for prefix in "u.sfdir3" "u.sfdir2" "u3.sfdir3"; do
		if [ -n "$(_scratch_xfs_get_metadata_field \
				"${prefix}.hdr.parent.i4" \
				"inode ${dir_ino}")" ]; then
			echo "${prefix}"
			return 0
		fi
	done
	_scratch_xfs_db -c "inode ${dir_ino}" -c 'p' >> $seqres.full
	return 1
}

_scratch_get_bmx_prefix() {
	local ino="$1"

	for prefix in "u3.bmx" "u.bmx"; do
		if [ -n "$(_scratch_xfs_get_metadata_field \
				"${prefix}[0].startblock" \
				"inode ${ino}")" ]; then
			echo "${prefix}"
			return 0
		fi
	done
	_scratch_xfs_db -c "inode ${ino}" -c 'p' >> $seqres.full
	return 1
}

_scratch_get_iext_count()
{
	local ino=$1
	local whichfork=$2
	local field=""

	case $whichfork in
		"attr")
			field=core.naextents
			;;
		"data")
			field=core.nextents
			;;
		*)
			return 1
	esac

	_scratch_xfs_get_metadata_field $field "inode $ino"
}

#
# Ensures that we don't pass any mount options incompatible with XFS v4
#
_force_xfsv4_mount_options()
{
	local gquota=0
	local pquota=0

	# Can't have group and project quotas in XFS v4
	echo "$MOUNT_OPTIONS" | egrep -q "(gquota|grpquota|grpjquota=|gqnoenforce)" && gquota=1
	echo "$MOUNT_OPTIONS" | egrep -q "(\bpquota|prjquota|pqnoenforce)" && pquota=1

	if [ $gquota -gt 0 ] && [ $pquota -gt 0 ]; then
		export MOUNT_OPTIONS=$(echo $MOUNT_OPTIONS \
			| sed   -e 's/gquota/QUOTA/g'      \
				-e 's/grpquota/QUOTA/g'    \
				-e 's/grpjquota=[^, ]/QUOTA/g' \
				-e 's/gqnoenforce/QUOTA/g' \
				-e "s/QUOTA/defaults/g")
	fi
	echo "MOUNT_OPTIONS = $MOUNT_OPTIONS" >>$seqres.full
}

# Find AG count of mounted filesystem
_xfs_mount_agcount()
{
	$XFS_INFO_PROG "$1" | grep agcount= | sed -e 's/^.*agcount=\([0-9]*\),.*$/\1/g'
}

# Wipe the superblock of each XFS AGs
_try_wipe_scratch_xfs()
{
	local num='^[0-9]+$'
	local agcount
	local agsize
	local dbsize

	# Try to wipe each SB if there's an existed XFS
	agcount=`_scratch_xfs_get_sb_field agcount 2>/dev/null`
	agsize=`_scratch_xfs_get_sb_field agblocks 2>/dev/null`
	dbsize=`_scratch_xfs_get_sb_field blocksize 2>/dev/null`
	if [[ $agcount =~ $num && $agsize =~ $num && $dbsize =~ $num ]];then
		for ((i = 0; i < agcount; i++)); do
			$XFS_IO_PROG -c "pwrite $((i * dbsize * agsize)) $dbsize" \
				$SCRATCH_DEV >/dev/null;
		done
	fi

	# Try to wipe each SB by default mkfs.xfs geometry
	local tmp=`mktemp -u`
	unset agcount agsize dbsize
	_scratch_mkfs_xfs -N 2>/dev/null | perl -ne '
		if (/^meta-data=.*\s+agcount=(\d+), agsize=(\d+) blks/) {
			print STDOUT "agcount=$1\nagsize=$2\n";
		}
		if (/^data\s+=\s+bsize=(\d+)\s/) {
			print STDOUT "dbsize=$1\n";
		}' > $tmp.mkfs

	. $tmp.mkfs
	if [[ $agcount =~ $num && $agsize =~ $num && $dbsize =~ $num ]];then
		for ((i = 0; i < agcount; i++)); do
			$XFS_IO_PROG -c "pwrite $((i * dbsize * agsize)) $dbsize" \
				$SCRATCH_DEV >/dev/null;
		done
	fi
	rm -f $tmp.mkfs
}

_require_xfs_copy()
{
	[ -n "$XFS_COPY_PROG" ] || _notrun "xfs_copy binary not yet installed"
	[ "$USE_EXTERNAL" = yes ] && \
		_notrun "Cannot xfs_copy with external devices"

	# xfs_copy on v5 filesystems do not require the "-d" option if xfs_db
	# can change the UUID on v5 filesystems
	touch /tmp/$$.img
	$MKFS_XFS_PROG -d file,name=/tmp/$$.img,size=64m >/dev/null 2>&1

	# xfs_db will return 0 even if it can't generate a new uuid, so
	# check the output to make sure if it can change UUID of V5 xfs
	$XFS_DB_PROG -x -c "uuid generate" /tmp/$$.img \
		| grep -q "invalid UUID\|supported on V5 fs" \
		&& export XFS_COPY_PROG="$XFS_COPY_PROG -d"
	rm -f /tmp/$$.img
}

__xfs_cowgc_interval_knob1="/proc/sys/fs/xfs/speculative_cow_prealloc_lifetime"
__xfs_cowgc_interval_knob2="/proc/sys/fs/xfs/speculative_prealloc_lifetime"

_xfs_set_cowgc_interval() {
	if [ -w $__xfs_cowgc_interval_knob1 ]; then
		echo "$@" > $__xfs_cowgc_interval_knob1
	elif [ -w $__xfs_cowgc_interval_knob2 ]; then
		echo "$@" > $__xfs_cowgc_interval_knob2
	else
		_fail "Can't find cowgc interval procfs knob?"
	fi
}

_xfs_get_cowgc_interval() {
	if [ -w $__xfs_cowgc_interval_knob1 ]; then
		cat $__xfs_cowgc_interval_knob1
	elif [ -w $__xfs_cowgc_interval_knob2 ]; then
		cat $__xfs_cowgc_interval_knob2
	else
		_fail "Can't find cowgc interval procfs knob?"
	fi
}

# Print the status of the given features on the scratch filesystem.
# Returns 0 if all features are found, 1 otherwise.
_check_scratch_xfs_features()
{
	local features="$(_scratch_xfs_db -c 'version')"
	local output=("FEATURES:")
	local found=0

	for feature in "$@"; do
		local status="NO"
		if echo "${features}" | grep -q -w "${feature}"; then
			status="YES"
			found=$((found + 1))
		fi
		output+=("${feature}:${status}")
	done

	echo "${output[@]}"
	test "${found}" -eq "$#"
}

# Skip a test if any of the given fs features aren't present on the scratch
# filesystem.  The scratch fs must have been formatted already.
_require_scratch_xfs_features()
{
	local features="$(_scratch_xfs_db -c 'version' 2>/dev/null)"

	for feature in "$@"; do
		echo "${features}" | grep -q -w "${feature}" ||
			_notrun "Missing scratch feature: ${feature}"
	done
}

# Decide if xfs_repair knows how to set (or clear) a filesystem feature.
_require_xfs_repair_upgrade()
{
	local type="$1"

	$XFS_REPAIR_PROG -c "$type=garbagevalue" 2>&1 | \
		grep -q 'unknown option' && \
		_notrun "xfs_repair does not support upgrading fs with $type"
}

# Require that the scratch device exists, that mkfs can format with inobtcount
# enabled, and that the kernel can mount such a filesystem.
_require_scratch_xfs_inobtcount()
{
	_require_scratch

	_scratch_mkfs -m inobtcount=1 &> /dev/null || \
		_notrun "mkfs.xfs doesn't support inobtcount feature"
	_try_scratch_mount || \
		_notrun "kernel doesn't support xfs inobtcount feature"
	_scratch_unmount
}

_xfs_timestamp_range()
{
	local device="$1"
	local use_db=0
	local dbprog="$XFS_DB_PROG $device"
	test "$device" = "$SCRATCH_DEV" && dbprog=_scratch_xfs_db

	$dbprog -f -c 'help timelimit' | grep -v -q 'not found' && use_db=1
	if [ $use_db -eq 0 ]; then
		# The "timelimit" command was added to xfs_db at the same time
		# that bigtime was added to xfsprogs.  Therefore, we can assume
		# the old timestamp range if the command isn't present.
		echo "-$((1<<31)) $(((1<<31)-1))"
	else
		$dbprog -f -c 'timelimit --compact' | \
			awk '{printf("%s %s", $1, $2);}'
	fi
}

# Require that the scratch device exists, that mkfs can format with bigtime
# enabled, that the kernel can mount such a filesystem, and that xfs_info
# advertises the presence of that feature.
_require_scratch_xfs_bigtime()
{
	_require_scratch

	_scratch_mkfs -m bigtime=1 &>/dev/null || \
		_notrun "mkfs.xfs doesn't support bigtime feature"
	_try_scratch_mount || \
		_notrun "kernel doesn't support xfs bigtime feature"
	$XFS_INFO_PROG "$SCRATCH_MNT" | grep -q -w "bigtime=1" || \
		_notrun "bigtime feature not advertised on mount?"
	_scratch_unmount
}

_xfs_filter_mkfs()
{
	echo "_fs_has_crcs=0" >&2
	set -
	perl -ne '
	if (/^meta-data=([\w,|\/.-]+)\s+isize=(\d+)\s+agcount=(\d+), agsize=(\d+) blks/) {
		print STDERR "ddev=$1\nisize=$2\nagcount=$3\nagsize=$4\n";
		print STDOUT "meta-data=DDEV isize=XXX agcount=N, agsize=XXX blks\n";
	}
	if (/^\s+=\s+sectsz=(\d+)\s+attr=(\d+)/) {
		print STDERR "sectsz=$1\nattr=$2\n";
	}
	if (/^\s+=\s+crc=(\d)/) {
		print STDERR "_fs_has_crcs=$1\n";
	}
	if (/^data\s+=\s+bsize=(\d+)\s+blocks=(\d+), imaxpct=(\d+)/) {
		print STDERR "dbsize=$1\ndblocks=$2\nimaxpct=$3\n";
		print STDOUT "data     = bsize=XXX blocks=XXX, imaxpct=PCT\n";
	}
	if (/^\s+=\s+sunit=(\d+)\s+swidth=(\d+) blks/) {
		print STDERR "sunit=$1\nswidth=$2\nunwritten=1\n";
		print STDOUT "         = sunit=XXX swidth=XXX, unwritten=X\n";
	}
	if (/^naming\s+=version\s+(\d+)\s+bsize=(\d+)/) {
		print STDERR "dirversion=$1\ndirbsize=$2\n";
		print STDOUT "naming   =VERN bsize=XXX\n";
	}
	if (/^log\s+=(internal log|[\w|\/.-]+)\s+bsize=(\d+)\s+blocks=(\d+),\s+version=(\d+)/ ||
		/^log\s+=(internal log|[\w|\/.-]+)\s+bsize=(\d+)\s+blocks=(\d+)/) {
		print STDERR "ldev=\"$1\"\nlbsize=$2\nlblocks=$3\nlversion=$4\n";
		print STDOUT "log      =LDEV bsize=XXX blocks=XXX\n";
	}
	if (/^\s+=\s+sectsz=(\d+)\s+sunit=(\d+) blks/) {
		print STDERR "logsectsz=$1\nlogsunit=$2\n\n";
	}
	if (/^realtime\s+=([\w|\/.-]+)\s+extsz=(\d+)\s+blocks=(\d+), rtextents=(\d+)/) {
		print STDERR "rtdev=$1\nrtextsz=$2\nrtblocks=$3\nrtextents=$4\n";
		print STDOUT "realtime =RDEV extsz=XXX blocks=XXX, rtextents=XXX\n";
	}'
}