apfstests/tests/generic/168

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Oracle, Inc.  All Rights Reserved.
#
# FS QA Test No. 168
#
# Test for races or FS corruption when writing to a file that's also
# the target of a reflink operation.
#
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.* $finished_file
    wait
}

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

# real QA test starts here
_supported_os Linux
_require_scratch_reflink

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

testdir=$SCRATCH_MNT/test-$seq
finished_file=/tmp/finished
rm -rf $finished_file
mkdir $testdir

loops=1024
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
_scratch_cycle_mount

# Direct I/O overwriter...
overwrite() {
	while [ ! -e $finished_file ]; do
		seq $nr_loops -1 0 | while read i; do
			_pwrite_byte 0x63 $((i * blksz)) $blksz $testdir/file2 >> $seqres.full
		done
	done
}

echo "Reflink and write the target"
overwrite &
seq 1 10 | while read j; do
	seq 0 $nr_loops | while read i; do
		_reflink_range  $testdir/file1 $((i * blksz)) \
				$testdir/file2 $((i * blksz)) $blksz >> $seqres.full
		[ $? -ne 0 ] && exit
	done
done
touch $finished_file
wait

# success, all done
status=0
exit