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#!/usr/bin/env python
#
# Test whether the backing BDSs are correct after completion of a
# mirror block job; in "existing" modes (drive-mirror with
# mode=existing and blockdev-mirror) the backing chain should not be
# overridden.
#
# Copyright (C) 2016 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 os
import iotests
from iotests import qemu_img
back0_img = os.path.join(iotests.test_dir, 'back0.' + iotests.imgfmt)
back1_img = os.path.join(iotests.test_dir, 'back1.' + iotests.imgfmt)
back2_img = os.path.join(iotests.test_dir, 'back2.' + iotests.imgfmt)
source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt)
target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt)
# Class variables for controlling its behavior:
#
# existing: If True, explicitly create the target image and blockdev-add it
# target_backing: If existing is True: Use this filename as the backing file
# of the target image
# (None: no backing file)
# target_blockdev_backing: If existing is True: Pass this dict as "backing"
# for the blockdev-add command
# (None: do not pass "backing")
# target_real_backing: If existing is True: The real filename of the backing
# image during runtime, only makes sense if
# target_blockdev_backing is not None
# (None: same as target_backing)
class BaseClass(iotests.QMPTestCase):
target_blockdev_backing = None
target_real_backing = None
def setUp(self):
qemu_img('create', '-f', iotests.imgfmt, back0_img, '1M')
qemu_img('create', '-f', iotests.imgfmt, '-b', back0_img, back1_img)
qemu_img('create', '-f', iotests.imgfmt, '-b', back1_img, back2_img)
qemu_img('create', '-f', iotests.imgfmt, '-b', back2_img, source_img)
self.vm = iotests.VM()
self.vm.add_drive(None, '', 'none')
self.vm.launch()
# Add the BDS via blockdev-add so it stays around after the mirror block
# job has been completed
result = self.vm.qmp('blockdev-add',
node_name='source',
driver=iotests.imgfmt,
file={'driver': 'file',
'filename': source_img})
self.assert_qmp(result, 'return', {})
result = self.vm.qmp('x-blockdev-insert-medium',
device='drive0', node_name='source')
self.assert_qmp(result, 'return', {})
self.assertIntactSourceBackingChain()
if self.existing:
if self.target_backing:
qemu_img('create', '-f', iotests.imgfmt,
'-b', self.target_backing, target_img, '1M')
else:
qemu_img('create', '-f', iotests.imgfmt, target_img, '1M')
if self.cmd == 'blockdev-mirror':
options = { 'node-name': 'target',
'driver': iotests.imgfmt,
'file': { 'driver': 'file',
'filename': target_img } }
if self.target_blockdev_backing:
options['backing'] = self.target_blockdev_backing
result = self.vm.qmp('blockdev-add', **options)
self.assert_qmp(result, 'return', {})
def tearDown(self):
self.vm.shutdown()
os.remove(source_img)
os.remove(back2_img)
os.remove(back1_img)
os.remove(back0_img)
try:
os.remove(target_img)
except OSError:
pass
def findBlockNode(self, node_name, id=None):
if id:
result = self.vm.qmp('query-block')
for device in result['return']:
if device['device'] == id:
if node_name:
self.assert_qmp(device, 'inserted/node-name', node_name)
return device['inserted']
else:
result = self.vm.qmp('query-named-block-nodes')
for node in result['return']:
if node['node-name'] == node_name:
return node
self.fail('Cannot find node %s/%s' % (id, node_name))
def assertIntactSourceBackingChain(self):
node = self.findBlockNode('source')
self.assert_qmp(node, 'image' + '/backing-image' * 0 + '/filename',
source_img)
self.assert_qmp(node, 'image' + '/backing-image' * 1 + '/filename',
back2_img)
self.assert_qmp(node, 'image' + '/backing-image' * 2 + '/filename',
back1_img)
self.assert_qmp(node, 'image' + '/backing-image' * 3 + '/filename',
back0_img)
self.assert_qmp_absent(node, 'image' + '/backing-image' * 4)
def assertCorrectBackingImage(self, node, default_image):
if self.existing:
if self.target_real_backing:
image = self.target_real_backing
else:
image = self.target_backing
else:
image = default_image
if image:
self.assert_qmp(node, 'image/backing-image/filename', image)
else:
self.assert_qmp_absent(node, 'image/backing-image')
# Class variables for controlling its behavior:
#
# cmd: Mirroring command to execute, either drive-mirror or blockdev-mirror
class MirrorBaseClass(BaseClass):
def runMirror(self, sync):
if self.cmd == 'blockdev-mirror':
result = self.vm.qmp(self.cmd, device='drive0', sync=sync,
target='target')
else:
if self.existing:
mode = 'existing'
else:
mode = 'absolute-paths'
result = self.vm.qmp(self.cmd, device='drive0', sync=sync,
target=target_img, format=iotests.imgfmt,
mode=mode, node_name='target')
self.assert_qmp(result, 'return', {})
self.vm.event_wait('BLOCK_JOB_READY')
result = self.vm.qmp('block-job-complete', device='drive0')
self.assert_qmp(result, 'return', {})
self.vm.event_wait('BLOCK_JOB_COMPLETED')
def testFull(self):
self.runMirror('full')
node = self.findBlockNode('target', 'drive0')
self.assertCorrectBackingImage(node, None)
self.assertIntactSourceBackingChain()
def testTop(self):
self.runMirror('top')
node = self.findBlockNode('target', 'drive0')
self.assertCorrectBackingImage(node, back2_img)
self.assertIntactSourceBackingChain()
def testNone(self):
self.runMirror('none')
node = self.findBlockNode('target', 'drive0')
self.assertCorrectBackingImage(node, source_img)
self.assertIntactSourceBackingChain()
class TestDriveMirrorAbsolutePaths(MirrorBaseClass):
cmd = 'drive-mirror'
existing = False
class TestDriveMirrorExistingNoBacking(MirrorBaseClass):
cmd = 'drive-mirror'
existing = True
target_backing = None
class TestDriveMirrorExistingBacking(MirrorBaseClass):
cmd = 'drive-mirror'
existing = True
target_backing = 'null-co://'
class TestBlockdevMirrorNoBacking(MirrorBaseClass):
cmd = 'blockdev-mirror'
existing = True
target_backing = None
class TestBlockdevMirrorBacking(MirrorBaseClass):
cmd = 'blockdev-mirror'
existing = True
target_backing = 'null-co://'
class TestBlockdevMirrorForcedBacking(MirrorBaseClass):
cmd = 'blockdev-mirror'
existing = True
target_backing = None
target_blockdev_backing = { 'driver': 'null-co' }
target_real_backing = 'null-co://'
class TestCommit(BaseClass):
existing = False
def testCommit(self):
result = self.vm.qmp('block-commit', device='drive0', base=back1_img)
self.assert_qmp(result, 'return', {})
self.vm.event_wait('BLOCK_JOB_READY')
result = self.vm.qmp('block-job-complete', device='drive0')
self.assert_qmp(result, 'return', {})
self.vm.event_wait('BLOCK_JOB_COMPLETED')
node = self.findBlockNode(None, 'drive0')
self.assert_qmp(node, 'image' + '/backing-image' * 0 + '/filename',
back1_img)
self.assert_qmp(node, 'image' + '/backing-image' * 1 + '/filename',
back0_img)
self.assert_qmp_absent(node, 'image' + '/backing-image' * 2 +
'/filename')
self.assertIntactSourceBackingChain()
BaseClass = None
MirrorBaseClass = None
if __name__ == '__main__':
iotests.main(supported_fmts=['qcow2'])
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