#! /bin/bash
# FS QA Test No. 284
#
# Btrfs Online defragmentation tests
#
#-----------------------------------------------------------------------
# Copyright (c) 2012 Fujitsu Liu Bo.  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.
#
# This program is distributed in the hope that it would 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 the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------
#
# creator
owner=liubo2009@cn.fujitsu.com

seq=`basename $0`
echo "QA output created by $seq"
here="`pwd`"
tmp=/tmp/$$
cnt=11999
filesize=48000

status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
    cd /
    rm -f $tmp.*
}

_create_file()
{
	if [ $1 -ne 2 ]; then
		tmpfile="$SCRATCH_MNT/tmp_file"
	else
		tmpfile="$SCRATCH_MNT/tmp_dir/tmp_file"
	fi
		
	for i in `seq $cnt -1 0`; do
		dd if=/dev/zero of=$tmpfile bs=4k count=1 \
		 conv=notrunc seek=$i oflag=sync &>/dev/null
	done
	# get md5sum
	md5sum $tmpfile > /tmp/checksum
}

_btrfs_online_defrag()
{
	str=""
	if [ "$2" = "2" ];then
		str="$str -s -1 -l $((filesize / 2)) "
	elif [ "$2" = "3" ];then
		str="$str -s $((filesize + 1)) -l $((filesize / 2)) "
		HAVE_DEFRAG=1
	elif [ "$2" = "4" ];then
		str="$str -l -1 "
	elif [ "$2" = "5" ];then
		str="$str -l $((filesize + 1)) "
	elif [ "$2" = "6" ];then
		str="$str -l $((filesize / 2)) "
	fi

	if [ "$3" = "2" ];then
		str="$str -c "
	fi

	if [ "$str" != "" ]; then
		btrfs filesystem defragment $str $SCRATCH_MNT/tmp_file
	else
		if [ "$1" = "1" ];then
			btrfs filesystem defragment $SCRATCH_MNT/tmp_file
		elif [ "$1" = "2" ];then
			btrfs filesystem defragment $SCRATCH_MNT/tmp_dir
		elif [ "$1" = "3" ];then
			btrfs filesystem defragment $SCRATCH_MNT
		fi
	fi
	ret_val=$?
	_scratch_remount
	if [ $ret_val -ne 20 ];then
		echo "btrfs filesystem defragment failed! err is $ret_val"
	fi
}

_checksum()
{
	md5sum -c /tmp/checksum > /dev/null 2>&1
	if [ $? -ne 0 ]; then
		echo "md5 checksum failed!"
	fi
}

_cleanup_defrag()
{
	umount $SCRATCH_MNT > /dev/null 2>&1
}

_setup_defrag()
{
	umount $SCRATCH_MNT > /dev/null 2>&1
	_scratch_mkfs > /dev/null 2>&1
	_scratch_mount
	_create_file $1
}

_rundefrag()
{
	_setup_defrag $1
	_btrfs_online_defrag $1 $2 $3
	_checksum
	_cleanup_defrag
	_check_scratch_fs
}

# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.defrag

# real QA test starts here
_supported_fs btrfs
_supported_os Linux

_setup_testdir
## We require scratch so that we'll have free contiguous space
_require_scratch
_scratch_mkfs >/dev/null 2>&1
_scratch_mount
_require_defrag

echo "defrag object | defragment range | defragment compress"
echo "a single file |  default | off"
_rundefrag 1 1 1

echo "a single file | default |  on"
_rundefrag 1 1 2

echo "a single file | start < 0 && 0 < len < file size | off"
_rundefrag 1 2 1

echo "a single file | start > file size && 0 < len < file size | off"
_rundefrag 1 3 1

echo "a single file | start = 0 && len < 0 | off"
_rundefrag 1 4 1

echo "a single file | start = 0 && len > file size | off"
_rundefrag 1 5 1

echo "a single file | start = 0 && 0 < len < file size | off"
_rundefrag 1 6 1

echo "a directory | default | off"
_rundefrag 2 1 1

echo "a filesystem | default | off"
_rundefrag 3 1 1

status=0
exit
