| #!/usr/bin/env python3 |
| # group: rw quick |
| # |
| # Test what happens when a stream job does an unaligned prefetch read |
| # which requires padding while having a NULL qiov. |
| # |
| # Copyright (C) Proxmox Server Solutions GmbH |
| # |
| # 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 imgfmt, qemu_img_create, qemu_io, QMPTestCase |
| |
| image_size = 1 * 1024 * 1024 |
| cluster_size = 64 * 1024 |
| base = os.path.join(iotests.test_dir, 'base.img') |
| top = os.path.join(iotests.test_dir, 'top.img') |
| |
| class TestStreamUnalignedPrefetch(QMPTestCase): |
| def setUp(self) -> None: |
| """ |
| Create two images: |
| - base image {base} with {cluster_size // 2} bytes allocated |
| - top image {top} without any data allocated and coarser |
| cluster size |
| |
| Attach a compress filter for the top image, because that |
| requires that the request alignment is the top image's cluster |
| size. |
| """ |
| qemu_img_create('-f', imgfmt, |
| '-o', 'cluster_size={}'.format(cluster_size // 2), |
| base, str(image_size)) |
| qemu_io('-c', f'write 0 {cluster_size // 2}', base) |
| qemu_img_create('-f', imgfmt, |
| '-o', 'cluster_size={}'.format(cluster_size), |
| top, str(image_size)) |
| |
| self.vm = iotests.VM() |
| self.vm.add_blockdev(self.vm.qmp_to_opts({ |
| 'driver': imgfmt, |
| 'node-name': 'base', |
| 'file': { |
| 'driver': 'file', |
| 'filename': base |
| } |
| })) |
| self.vm.add_blockdev(self.vm.qmp_to_opts({ |
| 'driver': 'compress', |
| 'node-name': 'compress-top', |
| 'file': { |
| 'driver': imgfmt, |
| 'node-name': 'top', |
| 'file': { |
| 'driver': 'file', |
| 'filename': top |
| }, |
| 'backing': 'base' |
| } |
| })) |
| self.vm.launch() |
| |
| def tearDown(self) -> None: |
| self.vm.shutdown() |
| os.remove(top) |
| os.remove(base) |
| |
| def test_stream_unaligned_prefetch(self) -> None: |
| self.vm.cmd('block-stream', job_id='stream', device='compress-top') |
| |
| |
| if __name__ == '__main__': |
| iotests.main(supported_fmts=['qcow2'], supported_protocols=['file']) |