| 1 | #!/usr/bin/env python3 |
| 2 | # |
| 3 | # Test for preallocate filter |
| 4 | # |
| 5 | # Copyright (c) 2020 Virtuozzo International GmbH. |
| 6 | # |
| 7 | # This program is free software; you can redistribute it and/or modify |
| 8 | # it under the terms of the GNU General Public License as published by |
| 9 | # the Free Software Foundation; either version 2 of the License, or |
| 10 | # (at your option) any later version. |
| 11 | # |
| 12 | # This program is distributed in the hope that it will be useful, |
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | # GNU General Public License for more details. |
| 16 | # |
| 17 | # You should have received a copy of the GNU General Public License |
| 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | # |
| 20 | |
| 21 | import os |
| 22 | import iotests |
| 23 | |
| 24 | MiB = 1024 * 1024 |
| 25 | disk = os.path.join(iotests.test_dir, 'disk') |
| 26 | overlay = os.path.join(iotests.test_dir, 'overlay') |
| 27 | refdisk = os.path.join(iotests.test_dir, 'refdisk') |
| 28 | drive_opts = f'node-name=disk,driver={iotests.imgfmt},' \ |
| 29 | f'file.node-name=filter,file.driver=preallocate,' \ |
| 30 | f'file.file.node-name=file,file.file.filename={disk}' |
| 31 | |
| 32 | |
| 33 | class TestPreallocateBase(iotests.QMPTestCase): |
| 34 | def setUp(self): |
| 35 | iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB)) |
| 36 | |
| 37 | def tearDown(self): |
| 38 | try: |
| 39 | self.check_small() |
| 40 | check = iotests.qemu_img_check(disk) |
| 41 | self.assertFalse('leaks' in check) |
| 42 | self.assertFalse('corruptions' in check) |
| 43 | self.assertEqual(check['check-errors'], 0) |
| 44 | finally: |
| 45 | os.remove(disk) |
| 46 | |
| 47 | def check_big(self): |
| 48 | self.assertTrue(os.path.getsize(disk) > 100 * MiB) |
| 49 | |
| 50 | def check_small(self): |
| 51 | self.assertTrue(os.path.getsize(disk) < 10 * MiB) |
| 52 | |
| 53 | |
| 54 | class TestQemuImg(TestPreallocateBase): |
| 55 | def test_qemu_img(self): |
| 56 | p = iotests.QemuIoInteractive('--image-opts', drive_opts) |
| 57 | |
| 58 | p.cmd('write 0 1M') |
| 59 | p.cmd('flush') |
| 60 | |
| 61 | self.check_big() |
| 62 | |
| 63 | p.close() |
| 64 | |
| 65 | |
| 66 | class TestPreallocateFilter(TestPreallocateBase): |
| 67 | def setUp(self): |
| 68 | super().setUp() |
| 69 | self.vm = iotests.VM().add_drive(path=None, opts=drive_opts) |
| 70 | self.vm.launch() |
| 71 | |
| 72 | def tearDown(self): |
| 73 | self.vm.shutdown() |
| 74 | super().tearDown() |
| 75 | |
| 76 | def test_prealloc(self): |
| 77 | self.vm.hmp_qemu_io('drive0', 'write 0 1M') |
| 78 | self.check_big() |
| 79 | |
| 80 | def test_external_snapshot(self): |
| 81 | self.test_prealloc() |
| 82 | |
| 83 | self.vm.cmd('blockdev-snapshot-sync', node_name='disk', |
| 84 | snapshot_file=overlay, |
| 85 | snapshot_node_name='overlay') |
| 86 | |
| 87 | # on reopen to r-o base preallocation should be dropped |
| 88 | self.check_small() |
| 89 | |
| 90 | self.vm.hmp_qemu_io('drive0', 'write 1M 1M') |
| 91 | |
| 92 | self.vm.cmd('block-commit', device='overlay') |
| 93 | self.complete_and_wait() |
| 94 | |
| 95 | # commit of new megabyte should trigger preallocation |
| 96 | self.check_big() |
| 97 | |
| 98 | def test_reopen_opts(self): |
| 99 | self.vm.cmd('blockdev-reopen', options=[{ |
| 100 | 'node-name': 'disk', |
| 101 | 'driver': iotests.imgfmt, |
| 102 | 'file': { |
| 103 | 'node-name': 'filter', |
| 104 | 'driver': 'preallocate', |
| 105 | 'prealloc-size': 20 * MiB, |
| 106 | 'prealloc-align': 5 * MiB, |
| 107 | 'file': { |
| 108 | 'node-name': 'file', |
| 109 | 'driver': 'file', |
| 110 | 'filename': disk |
| 111 | } |
| 112 | } |
| 113 | }]) |
| 114 | |
| 115 | self.vm.hmp_qemu_io('drive0', 'write 0 1M') |
| 116 | self.assertTrue(os.path.getsize(disk) == 25 * MiB) |
| 117 | |
| 118 | |
| 119 | class TestTruncate(iotests.QMPTestCase): |
| 120 | def setUp(self): |
| 121 | iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB)) |
| 122 | iotests.qemu_img_create('-f', iotests.imgfmt, refdisk, str(10 * MiB)) |
| 123 | |
| 124 | def tearDown(self): |
| 125 | os.remove(disk) |
| 126 | os.remove(refdisk) |
| 127 | |
| 128 | def do_test(self, prealloc_mode, new_size): |
| 129 | iotests.qemu_io('--image-opts', '-c', 'write 0 10M', '-c', |
| 130 | f'truncate -m {prealloc_mode} {new_size}', |
| 131 | drive_opts) |
| 132 | |
| 133 | iotests.qemu_io('-f', iotests.imgfmt, '-c', 'write 0 10M', |
| 134 | '-c', f'truncate -m {prealloc_mode} {new_size}', |
| 135 | refdisk) |
| 136 | |
| 137 | stat = os.stat(disk) |
| 138 | refstat = os.stat(refdisk) |
| 139 | |
| 140 | # The preallocate filter may keep cluster alignment when shrinking, |
| 141 | # so ignore small differences |
| 142 | self.assertLess(abs(stat.st_size - refstat.st_size), 64 * 1024) |
| 143 | |
| 144 | # Preallocate filter may leak some internal clusters (for example, if |
| 145 | # guest write far over EOF, skipping some clusters - they will remain |
| 146 | # fallocated, preallocate filter don't care about such leaks, it drops |
| 147 | # only trailing preallocation. |
| 148 | self.assertLess(abs(stat.st_blocks - refstat.st_blocks) * 512, |
| 149 | 1024 * 1024) |
| 150 | |
| 151 | def test_real_shrink(self): |
| 152 | self.do_test('off', '5M') |
| 153 | |
| 154 | def test_truncate_inside_preallocated_area__falloc(self): |
| 155 | self.do_test('falloc', '50M') |
| 156 | |
| 157 | def test_truncate_inside_preallocated_area__metadata(self): |
| 158 | self.do_test('metadata', '50M') |
| 159 | |
| 160 | def test_truncate_inside_preallocated_area__full(self): |
| 161 | self.do_test('full', '50M') |
| 162 | |
| 163 | def test_truncate_inside_preallocated_area__off(self): |
| 164 | self.do_test('off', '50M') |
| 165 | |
| 166 | def test_truncate_over_preallocated_area__falloc(self): |
| 167 | self.do_test('falloc', '150M') |
| 168 | |
| 169 | def test_truncate_over_preallocated_area__metadata(self): |
| 170 | self.do_test('metadata', '150M') |
| 171 | |
| 172 | def test_truncate_over_preallocated_area__full(self): |
| 173 | self.do_test('full', '150M') |
| 174 | |
| 175 | def test_truncate_over_preallocated_area__off(self): |
| 176 | self.do_test('off', '150M') |
| 177 | |
| 178 | |
| 179 | if __name__ == '__main__': |
| 180 | iotests.main(supported_fmts=['qcow2'], required_fmts=['preallocate'], |
| 181 | require_hmp=True) |