1#!/usr/bin/env python3 2# group: rw quick 3# 4# Test what happens when a stream job does an unaligned prefetch read 5# which requires padding while having a NULL qiov. 6# 7# Copyright (C) Proxmox Server Solutions GmbH 8# 9# This program is free software; you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation; either version 2 of the License, or 12# (at your option) any later version. 13# 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18# 19# You should have received a copy of the GNU General Public License 20# along with this program. If not, see <http://www.gnu.org/licenses/>. 21# 22 23import os 24import iotests 25from iotests import imgfmt, qemu_img_create, qemu_io, QMPTestCase 26 27image_size = 1 * 1024 * 1024 28cluster_size = 64 * 1024 29base = os.path.join(iotests.test_dir, 'base.img') 30top = os.path.join(iotests.test_dir, 'top.img') 31 32class TestStreamUnalignedPrefetch(QMPTestCase): 33 def setUp(self) -> None: 34 """ 35 Create two images: 36 - base image {base} with {cluster_size // 2} bytes allocated 37 - top image {top} without any data allocated and coarser 38 cluster size 39 40 Attach a compress filter for the top image, because that 41 requires that the request alignment is the top image's cluster 42 size. 43 """ 44 qemu_img_create('-f', imgfmt, 45 '-o', 'cluster_size={}'.format(cluster_size // 2), 46 base, str(image_size)) 47 qemu_io('-c', f'write 0 {cluster_size // 2}', base) 48 qemu_img_create('-f', imgfmt, 49 '-o', 'cluster_size={}'.format(cluster_size), 50 top, str(image_size)) 51 52 self.vm = iotests.VM() 53 self.vm.add_blockdev(self.vm.qmp_to_opts({ 54 'driver': imgfmt, 55 'node-name': 'base', 56 'file': { 57 'driver': 'file', 58 'filename': base 59 } 60 })) 61 self.vm.add_blockdev(self.vm.qmp_to_opts({ 62 'driver': 'compress', 63 'node-name': 'compress-top', 64 'file': { 65 'driver': imgfmt, 66 'node-name': 'top', 67 'file': { 68 'driver': 'file', 69 'filename': top 70 }, 71 'backing': 'base' 72 } 73 })) 74 self.vm.launch() 75 76 def tearDown(self) -> None: 77 self.vm.shutdown() 78 os.remove(top) 79 os.remove(base) 80 81 def test_stream_unaligned_prefetch(self) -> None: 82 self.vm.cmd('block-stream', job_id='stream', device='compress-top') 83 84 85if __name__ == '__main__': 86 iotests.main(supported_fmts=['qcow2'], supported_protocols=['file']) 87