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#!/usr/bin/env python3
# group: rw
#
# Tests for active mirroring
#
# Copyright (C) 2018 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
source_img = os.path.join(iotests.test_dir, 'source.' + iotests.imgfmt)
target_img = os.path.join(iotests.test_dir, 'target.' + iotests.imgfmt)
class TestActiveMirror(iotests.QMPTestCase):
image_len = 128 * 1024 * 1024 # MB
potential_writes_in_flight = True
def setUp(self):
qemu_img('create', '-f', iotests.imgfmt, source_img, '128M')
qemu_img('create', '-f', iotests.imgfmt, target_img, '128M')
blk_source = {'id': 'source',
'if': 'none',
'node-name': 'source-node',
'driver': iotests.imgfmt,
'file': {'driver': 'blkdebug',
'image': {'driver': 'file',
'filename': source_img}}}
blk_target = {'node-name': 'target-node',
'driver': iotests.imgfmt,
'file': {'driver': 'file',
'filename': target_img}}
self.vm = iotests.VM()
self.vm.add_drive_raw(self.vm.qmp_to_opts(blk_source))
self.vm.add_blockdev(self.vm.qmp_to_opts(blk_target))
self.vm.add_device('virtio-blk,drive=source')
self.vm.launch()
def tearDown(self):
self.vm.shutdown()
if not self.potential_writes_in_flight:
self.assertTrue(iotests.compare_images(source_img, target_img),
'mirror target does not match source')
os.remove(source_img)
os.remove(target_img)
def doActiveIO(self, sync_source_and_target):
# Fill the source image
self.vm.hmp_qemu_io('source',
'write -P 1 0 %i' % self.image_len);
# Start some background requests
for offset in range(1 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024):
self.vm.hmp_qemu_io('source', 'aio_write -P 2 %i 1M' % offset)
for offset in range(2 * self.image_len // 8, 3 * self.image_len // 8, 1024 * 1024):
self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
# Start the block job
result = self.vm.qmp('blockdev-mirror',
job_id='mirror',
filter_node_name='mirror-node',
device='source-node',
target='target-node',
sync='full',
copy_mode='write-blocking')
self.assert_qmp(result, 'return', {})
# Start some more requests
for offset in range(3 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024):
self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
for offset in range(4 * self.image_len // 8, 5 * self.image_len // 8, 1024 * 1024):
self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
# Wait for the READY event
self.wait_ready(drive='mirror')
# Now start some final requests; all of these (which land on
# the source) should be settled using the active mechanism.
# The mirror code itself asserts that the source BDS's dirty
# bitmap will stay clean between READY and COMPLETED.
for offset in range(5 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024):
self.vm.hmp_qemu_io('source', 'aio_write -P 3 %i 1M' % offset)
for offset in range(6 * self.image_len // 8, 7 * self.image_len // 8, 1024 * 1024):
self.vm.hmp_qemu_io('source', 'aio_write -z %i 1M' % offset)
if sync_source_and_target:
# If source and target should be in sync after the mirror,
# we have to flush before completion
self.vm.hmp_qemu_io('source', 'aio_flush')
self.potential_writes_in_flight = False
self.complete_and_wait(drive='mirror', wait_ready=False)
def testActiveIO(self):
self.doActiveIO(False)
def testActiveIOFlushed(self):
self.doActiveIO(True)
def testUnalignedActiveIO(self):
# Fill the source image
result = self.vm.hmp_qemu_io('source', 'write -P 1 0 2M')
# Start the block job (very slowly)
result = self.vm.qmp('blockdev-mirror',
job_id='mirror',
filter_node_name='mirror-node',
device='source-node',
target='target-node',
sync='full',
copy_mode='write-blocking',
buf_size=(1048576 // 4),
speed=1)
self.assert_qmp(result, 'return', {})
# Start an unaligned request to a dirty area
result = self.vm.hmp_qemu_io('source', 'write -P 2 %i 1' % (1048576 + 42))
# Let the job finish
result = self.vm.qmp('block-job-set-speed', device='mirror', speed=0)
self.assert_qmp(result, 'return', {})
self.complete_and_wait(drive='mirror')
self.potential_writes_in_flight = False
def testIntersectingActiveIO(self):
# Fill the source image
result = self.vm.hmp_qemu_io('source', 'write -P 1 0 2M')
# Start the block job (very slowly)
result = self.vm.qmp('blockdev-mirror',
job_id='mirror',
filter_node_name='mirror-node',
device='source-node',
target='target-node',
sync='full',
copy_mode='write-blocking',
speed=1)
self.vm.hmp_qemu_io('source', 'break write_aio A')
self.vm.hmp_qemu_io('source', 'aio_write 0 1M') # 1
self.vm.hmp_qemu_io('source', 'wait_break A')
self.vm.hmp_qemu_io('source', 'aio_write 0 2M') # 2
self.vm.hmp_qemu_io('source', 'aio_write 0 2M') # 3
# Now 2 and 3 are in mirror_wait_on_conflicts, waiting for 1
self.vm.hmp_qemu_io('source', 'break write_aio B')
self.vm.hmp_qemu_io('source', 'aio_write 1M 2M') # 4
self.vm.hmp_qemu_io('source', 'wait_break B')
# 4 doesn't wait for 2 and 3, because they didn't yet set
# in_flight_bitmap. So, nothing prevents 4 to go except for our
# break-point B.
self.vm.hmp_qemu_io('source', 'resume A')
# Now we resumed 1, so 2 and 3 goes to the next iteration of while loop
# in mirror_wait_on_conflicts(). They don't exit, as bitmap is dirty
# due to request 4.
# In the past at that point 2 and 3 would wait for each other producing
# a dead-lock. Now this is fixed and they will wait for request 4.
self.vm.hmp_qemu_io('source', 'resume B')
# After resuming 4, one of 2 and 3 goes first and set in_flight_bitmap,
# so the other will wait for it.
result = self.vm.qmp('block-job-set-speed', device='mirror', speed=0)
self.assert_qmp(result, 'return', {})
self.complete_and_wait(drive='mirror')
self.potential_writes_in_flight = False
if __name__ == '__main__':
iotests.main(supported_fmts=['qcow2', 'raw'],
supported_protocols=['file'])
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