qemu-iotests: Add test case for mirror with unmap

#!/usr/bin/env python

#

# Test mirror with unmap

#

# Copyright (C) 2015 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/>.

#

import time

import os

import iotests

from iotests import qemu_img, qemu_io

test_img = os.path.join(iotests.test_dir, 'test.img')

target_img = os.path.join(iotests.test_dir, 'target.img')

class TestSingleDrive(iotests.QMPTestCase):

    image_len = 2 * 1024 * 1024 # MB

    def setUp(self):

        # Write data to the image so we can compare later

        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSingleDrive.image_len))

        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x5d 0 2M', test_img)

        self.vm = iotests.VM().add_drive(test_img, 'discard=unmap')

        self.vm.launch()

    def tearDown(self):

        self.vm.shutdown()

        os.remove(test_img)

        try:

            os.remove(target_img)

        except OSError:

            pass

    def test_mirror_discard(self):

        result = self.vm.qmp('drive-mirror', device='drive0', sync='full',

                             target=target_img)

        self.assert_qmp(result, 'return', {})

        self.vm.hmp_qemu_io('drive0', 'discard 0 64k')

        self.complete_and_wait('drive0')

        self.vm.shutdown()

        self.assertTrue(iotests.compare_images(test_img, target_img),

                        'target image does not match source after mirroring')

if __name__ == '__main__':

    iotests.main(supported_fmts=['raw', 'qcow2'])

.

----------------------------------------------------------------------

Ran 1 tests

OK

129 rw auto quick

130 rw auto quick

131 rw auto quick

132 rw auto quick

134 rw auto quick