qemu/tests/qemu-iotests/268

#!/usr/bin/env bash
#
# Test write request with required alignment larger than the cluster size
#
# Copyright (C) 2019 Igalia, S.L.
# Author: Alberto Garcia <berto@igalia.com>
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
#

# creator
owner=berto@igalia.com

seq=`basename $0`
echo "QA output created by $seq"

status=1	# failure is the default!

_cleanup()
{
    _cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15

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

_supported_fmt qcow2
_supported_proto file fuse

echo
echo "== Required alignment larger than cluster size =="

CLUSTER_SIZE=2k _make_test_img 1M
# Since commit c8bb23cbdb writing to an unallocated cluster fills the
# empty COW areas with bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK)
$QEMU_IO -c "open -o driver=$IMGFMT,file.align=4k blkdebug::$TEST_IMG" \
         -c "write 0 512" | _filter_qemu_io

# success, all done
echo "*** done"
rm -f $seq.full
status=0