#! /bin/bash
# FS QA Test No. 164
#
# Test for races or FS corruption between reflink and buffered I/O reading the
# target file.
#
#-----------------------------------------------------------------------
# Copyright (c) 2015 Oracle, Inc.  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 7 15

_cleanup()
{
    cd /
    rm -rf "$tmp".*
    wait
}

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

# real QA test starts here
_supported_os Linux
_require_scratch_reflink
_require_cp_reflink

echo "Format and mount"
_scratch_mkfs > "$seqres.full" 2>&1
_scratch_mount >> "$seqres.full" 2>&1

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

loops=512
nr_loops=$((loops - 1))
BLKSZ=65536

echo "Initialize files"
echo > "$seqres.full"
_pwrite_byte 0x61 0 $((loops * BLKSZ)) "$TESTDIR/file1" >> "$seqres.full"
_pwrite_byte 0x62 0 $((loops * BLKSZ)) "$TESTDIR/file2" >> "$seqres.full"
_cp_reflink "$TESTDIR/file1" "$TESTDIR/file3"
_scratch_remount

fbytes() {
	egrep -v '(61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61|62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62)'
}

reader() {
	while [ ! -e "$TESTDIR/finished" ]; do
		_read_range "$TESTDIR/file3" 0 $((loops * BLKSZ)) | fbytes
	done
}

echo "Reflink and reread the files!"
reader &
for i in `seq 1 2`; do
	seq $nr_loops -1 0 | while read i; do
		_reflink_range  "$TESTDIR/file1" $((i * BLKSZ)) \
				"$TESTDIR/file3" $((i * BLKSZ)) $BLKSZ >> "$seqres.full"
		[ $? -ne 0 ] && break
	done
	seq $nr_loops -1 0 | while read i; do
		_reflink_range  "$TESTDIR/file2" $((i * BLKSZ)) \
				"$TESTDIR/file3" $((i * BLKSZ)) $BLKSZ >> "$seqres.full"
		[ $? -ne 0 ] && break
	done
done
echo "Finished reflinking"
touch "$TESTDIR/finished"
wait

echo "Check fs"
umount "$SCRATCH_MNT"
_check_scratch_fs

echo "Done"
# success, all done
status=0
exit