iotests: Test reverse sub-cluster qcow2 writes

#!/usr/bin/env bash

#

# Test reverse-ordered qcow2 writes on a sub-cluster level

#

# Copyright (C) 2019 Red Hat, Inc.

#

# 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/>.

#

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

# qcow2-specific test

_supported_fmt qcow2

_supported_proto file

_supported_os Linux

echo '--- Writing to the image ---'

# Reduce cluster size so we get more and quicker I/O

IMGOPTS='cluster_size=4096' _make_test_img 1M

(for ((kb = 1024 - 4; kb >= 0; kb -= 4)); do \

     echo "aio_write -P 42 $((kb + 1))k 2k"; \

 done) \

 | $QEMU_IO "$TEST_IMG" > /dev/null

echo '--- Verifying its content ---'

(for ((kb = 0; kb < 1024; kb += 4)); do \

    echo "read -P 0 ${kb}k 1k"; \

    echo "read -P 42 $((kb + 1))k 2k"; \

    echo "read -P 0 $((kb + 3))k 1k"; \

 done) \

 | $QEMU_IO "$TEST_IMG" | _filter_qemu_io | grep 'verification'

# Status of qemu-io

if [ ${PIPESTATUS[1]} = 0 ]; then

    echo 'Content verified.'

fi

# success, all done

echo "*** done"

rm -f $seq.full

status=0

QA output created by 265

--- Writing to the image ---

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576

--- Verifying its content ---

Content verified.

*** done

257 rw

258 rw quick

262 rw quick migration

265 rw auto quick