#! /bin/bash
# FS QA Test No. 031
#
# Testing cross-subvolume sparse copy on btrfs
#    - Create two subvolumes, mount one of them
#    - Create a file on each (sub/root)volume,
#      reflink them on the other volumes
#    - Change one original and two reflinked files
#    - Move reflinked files between subvolumes
#
#-----------------------------------------------------------------------
# Copyright (c) 2014, Oracle and/or its affiliates.  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
#-----------------------------------------------------------------------

seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

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

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

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

# real QA test starts here
_supported_fs btrfs
_supported_os Linux

_require_test
_require_scratch
_require_cp_reflink

_checksum_files()
{
	for f in file1 file2 file3; do
		echo "$f:"
		for d in $testdir1 $cross_mount_test_dir $subvol2; do
			_md5_checksum $d/$f
		done
	done
}

testdir1=$SCRATCH_MNT/test-$seq-1
testdir2=$SCRATCH_MNT/test-$seq-2
subvol1=$SCRATCH_MNT/subvol-$seq-1
subvol2=$SCRATCH_MNT/subvol-$seq-2
cross_mount_test_dir=$TEST_DIR/test-$seq

rm -f $seqres.full

_scratch_mkfs > /dev/null 2>&1
_scratch_mount

mkdir $testdir1
mkdir $testdir2
$BTRFS_UTIL_PROG subvolume create $subvol1 >> $seqres.full
$BTRFS_UTIL_PROG subvolume create $subvol2 >> $seqres.full
rm -rf $cross_mount_test_dir
mkdir $cross_mount_test_dir

_mount -t btrfs -o subvol=subvol-$seq-1 $SCRATCH_DEV $cross_mount_test_dir

echo "Create initial files"
# #testdir1/file1 is very small and will be inlined
$XFS_IO_PROG -f -c 'pwrite -S 0x61 0 10' $testdir1/file1 \
    >> $seqres.full
$XFS_IO_PROG -f -c 'pwrite -S 0x62 0 13000' $cross_mount_test_dir/file2 \
    >> $seqres.full
$XFS_IO_PROG -f -c 'pwrite -S 0x63 0 17000' $subvol2/file3 \
    >> $seqres.full

echo "Create reflinks to the initial files on other subvolumes"
cp --reflink=always $testdir1/file1 $subvol1
cp --reflink=always $testdir1/file1 $subvol2
cp --reflink=always $subvol1/file2 $testdir1/
cp --reflink=always $subvol1/file2 $subvol2
cp --reflink=always $subvol2/file3 $testdir1/
cp --reflink=always $subvol2/file3 $subvol1

echo "Verify the reflinks"
_verify_reflink $cross_mount_test_dir/file2 $testdir1/file2
_verify_reflink $cross_mount_test_dir/file2 $subvol2/file2
_verify_reflink $subvol2/file3 $testdir1/file3
_verify_reflink $subvol2/file3 $cross_mount_test_dir/file3
echo "Verify the file contents:"
_checksum_files

echo -e "---\nOverwrite some files with new content"
$XFS_IO_PROG -c 'pwrite -S 0x64 0 20' $testdir1/file1 >> $seqres.full
$XFS_IO_PROG -c 'pwrite -S 0x66 0 21000' $subvol2/file2 >> $seqres.full
$XFS_IO_PROG -c 'pwrite -S 0x65 5000 5000' $cross_mount_test_dir/file3 \
    >> $seqres.full

echo -n "Verify that non-overwritten reflinks "
echo "still have the same data blocks"
_verify_reflink $testdir1/file2 $cross_mount_test_dir/file2
_verify_reflink $testdir1/file3 $subvol2/file3
echo "Verify the file contents:"
_checksum_files

echo -e "---\nShuffle files between directories"
mv $testdir1/file* $testdir2
mv $cross_mount_test_dir/file* $testdir1/
mv $subvol2/file* $cross_mount_test_dir/
mv $testdir2/file* $subvol2/

# No _verify_reflink here as data is copied when moving files
# between subvols
echo "Verify the file contents:"
_checksum_files

$UMOUNT_PROG $cross_mount_test_dir

# success, all done
status=0
exit