#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015, Oracle and/or its affiliates.  All Rights Reserved.
#
# FS QA Test No. 142
#
# Ensure that reflinking a file N times and CoWing the copies leaves the
# original intact.
#   - Create a file and record its hash
#   - Create some reflink copies
#   - Rewrite all the reflink copies
#   - Compare the contents of the original file
#
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

rm -f $seqres.full

testdir=$TEST_DIR/test-$seq
rm -rf $testdir
mkdir $testdir

echo "Create the original file blocks"
blksz=65536
nr=9
filesize=$((blksz * nr))
_pwrite_byte 0x61 0 $((blksz * 256)) $testdir/file1 >> $seqres.full
_test_cycle_mount

md5sum $testdir/file1 | _filter_test_dir
csum=$(_md5_checksum $testdir/file1)

echo "Create the reflink copies"
seq 2 $nr | while read i; do
	_cp_reflink $testdir/file1 $testdir/file$i
done
_test_cycle_mount

echo "Rewrite the copies"
seq 2 $nr | while read i; do
	_pwrite_byte 0x62 0 $((blksz * 256)) $testdir/file$i >> $seqres.full
done
_test_cycle_mount

echo "Examine original file"
md5sum $testdir/file1 | _filter_test_dir
md5sum $testdir/file2 | _filter_test_dir

mod_csum=$(_md5_checksum $testdir/file2)
new_csum=$(_md5_checksum $testdir/file1)
test ${csum} != ${mod_csum} || echo "checksums do not match"
test ${csum} = ${new_csum} || echo "checksums do not match"

# success, all done
status=0
exit