tests/generic/427

#! /bin/bash
# FS QA Test No. 427
#
# Try to trigger a race of free eofblocks and file extending dio writes.
# A known bug of XFS has been fixed by "e4229d6 xfs: fix eofblocks race
# with file extending async dio writes"
#
#-----------------------------------------------------------------------
# Copyright (c) 2017 Red Hat 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 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

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

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs generic
_supported_os Linux
_require_scratch
_require_test_program "feature"
_require_aiodio aio-dio-eof-race

# limit the filesystem size, to save the time of filling filesystem
_scratch_mkfs_sized $((256 * 1024 * 1024)) >>$seqres.full 2>&1
_scratch_mount

# try to write more bytes than filesystem size to fill the filesystem,
# then remove all these data. If we still can find these stale data in
# a file' eofblock, then it's a bug
$XFS_IO_PROG -f -c "pwrite -S 0x55 0 $((256 * 1024 * 1024 * 2))" \
	     $SCRATCH_MNT/fillfs-$seq 2>/dev/null
rm -f $SCRATCH_MNT/fillfs-$seq

# open & close the file frequently, to trigger xfs_free_eofblocks
while true; do
	$XFS_IO_PROG -f -c open $SCRATCH_MNT/tst-aio-dio-eof-race.$seq \
		>/dev/null 2>&1
done &
open_close_pid=$!

nr_cpu=`$here/src/feature -o`
fsize=$((nr_cpu * 10))
if [ $fsize -gt 200 ]; then
	fsize=200
fi
# start a background aio writer, which does several extending loops
# internally and check data integrality
$AIO_TEST -s $fsize -b 65536 $SCRATCH_MNT/tst-aio-dio-eof-race.$seq
status=$?

kill $open_close_pid
wait $open_close_pid
exit