#! /bin/bash
# FS QA Test No. 178
#
# Ensure that punch-hole doesn't clobber CoW.
#
#-----------------------------------------------------------------------
# Copyright (c) 2015, 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 -rf "$tmp".* "$TESTDIR"
}

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

# real QA test starts here
_supported_os Linux
_require_test_reflink
_require_cp_reflink
_require_xfs_io_command "fpunch"

rm -f "$seqres.full"

TESTDIR="$TEST_DIR/test-$seq"
rm -rf "$TESTDIR"
mkdir "$TESTDIR"

echo "Create the original files"
BLKSZ=65536
NR=512
_pwrite_byte 0x61 0 $((BLKSZ * NR)) "$TESTDIR/file1" >> "$seqres.full"

_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2"
_test_remount

md5sum "$TESTDIR/file1" | _filter_test_dir
md5sum "$TESTDIR/file2" | _filter_test_dir

echo "Write and punch"
_pwrite_byte 0x62 0 $((BLKSZ * 256)) "$TESTDIR/file2" >> "$seqres.full"
"$XFS_IO_PROG" -f -c "fpunch $BLKSZ $((BLKSZ * 254))" "$TESTDIR/file2"
_test_remount

echo "Compare results"
md5sum "$TESTDIR/file1" | _filter_test_dir
md5sum "$TESTDIR/file2" | _filter_test_dir

# success, all done
status=0
exit