apfstests/tests/generic/162

#! /bin/bash
# FS QA Test No. 162
#
# Test for race between dedupe and writing the dest 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_dedupe

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 0x61 0 $((loops * blksz)) "$testdir/file2" >> "$seqres.full"
_scratch_remount

overwrite() {
	while [ ! -e "$testdir/finished" ]; do
		seq $nr_loops -1 0 | while read i; do
			_pwrite_byte 0x61 $((i * blksz)) $blksz "$testdir/file2" >> "$seqres.full"
		done
	done
}

echo "Dedupe and rewrite the file!"
overwrite &
for i in `seq 1 2`; do
	seq $nr_loops -1 0 | while read i; do
		_dedupe_range   "$testdir/file1" $((i * blksz)) \
				"$testdir/file2" $((i * blksz)) $blksz >> "$seqres.full"
		[ $? -ne 0 ] && break
	done
done
echo "Finished dedupeing"
touch "$testdir/finished"
wait

# success, all done
status=0
exit