| #!/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']) |
