#
# ext4 specific common functions
#

__generate_ext4_report_vars() {
	__generate_blockdev_report_vars TEST_LOGDEV
	__generate_blockdev_report_vars SCRATCH_LOGDEV
}

_setup_large_ext4_fs()
{
	local 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
	local 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.
	_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

	local file_size=$((16*1024*1024*1024*1024 - 4096))
	local 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_opts()
{
	mkfs_opts=$*

	_scratch_options mkfs

	echo "$MKFS_EXT4_PROG $SCRATCH_OPTIONS $mkfs_opts"
}

_scratch_mkfs_ext4()
{
	local mkfs_cmd="`_scratch_mkfs_ext4_opts`"
	local mkfs_filter="grep -v -e ^Warning: -e \"^mke2fs \" | grep -v \"^$\""
	local tmp=`mktemp -u`
	local mkfs_status

	if [ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ]; then
		$MKFS_EXT4_PROG -F -O journal_dev $MKFS_OPTIONS $* $SCRATCH_LOGDEV 2>$tmp.mkfserr 1>$tmp.mkfsstd
		mkjournal_status=$?

		if [ $mkjournal_status -ne 0 ]; then
			cat $tmp.mkfsstd
			cat $tmp.mkfserr >&2
			return $mkjournal_status
		fi
	fi

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

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

	return $mkfs_status
}

_ext4_metadump()
{
	local device="$1"
	local dumpfile="$2"
	local compressopt="$3"

	test -n "$E2IMAGE_PROG" || _fail "e2image not installed"
	$E2IMAGE_PROG -Q "$device" "$dumpfile"
	[ "$compressopt" = "compress" ] && [ -n "$DUMP_COMPRESSOR" ] &&
		$DUMP_COMPRESSOR -f "$dumpfile" &>> "$seqres.full"
}

_ext4_mdrestore()
{
	local metadump="$1"
	local device="$2"
	shift; shift
	local options="$@"

	# If we're configured for compressed dumps and there isn't already an
	# uncompressed dump, see if we can use DUMP_COMPRESSOR to decompress
	# something.
	if [ ! -e "$metadump" ] && [ -n "$DUMP_COMPRESSOR" ]; then
		for compr in "$metadump".*; do
			[ -e "$compr" ] && $DUMP_COMPRESSOR -d -f -k "$compr" && break
		done
	fi
	test -r "$metadump" || return 1

	$E2IMAGE_PROG $options -r "${metadump}" "${SCRATCH_DEV}"
}

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

# Check whether the specified feature whether it is supported by
# mkfs.ext4 and the kernel.
_require_scratch_ext4_feature()
{
    if [ -z "$1" ]; then
        echo "Usage: _require_scratch_ext4_feature feature"
        exit 1
    fi
    $MKFS_EXT4_PROG -F $MKFS_OPTIONS -O "$1" \
		    $SCRATCH_DEV 512m >/dev/null 2>&1 \
	|| _notrun "mkfs.ext4 doesn't support $1 feature"
    _try_scratch_mount >/dev/null 2>&1 \
	|| _notrun "Kernel doesn't support the ext4 feature(s): $1"
    _scratch_unmount
}

# Disable extent zeroing for ext4 on the given device
_ext4_disable_extent_zeroout()
{
	local dev=${1:-$TEST_DEV}
	local sdev=`_short_dev $dev`

	[ -f /sys/fs/ext4/$sdev/extent_max_zeroout_kb ] && \
		echo 0 >/sys/fs/ext4/$sdev/extent_max_zeroout_kb
}

_scratch_ext4_options()
{
	local type=$1
	local log_opt=""

	case $type in
	mkfs)
		SCRATCH_OPTIONS="$SCRATCH_OPTIONS -F"
		log_opt="-J device=$SCRATCH_LOGDEV"
		;;
	mount)
		# As of kernel 5.19, the kernel mount option path parser only
		# accepts direct paths to block devices--the final path
		# component cannot be a symlink.
		log_opt="-o journal_path=$(realpath -q "$SCRATCH_LOGDEV")"
		;;
	esac
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		SCRATCH_OPTIONS="$SCRATCH_OPTIONS ${log_opt}"
}

# Get the inode flags for a particular inode number
_ext4_get_inum_iflags() {
	local dev="$1"
	local inumber="$2"

	debugfs -R "stat <${inumber}>" "${dev}" 2> /dev/null | \
			sed -n 's/^.*Flags: \([0-9a-fx]*\).*$/\1/p'
}