tests/qemu-iotests/298

   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         result = self.vm.qmp('blockdev-snapshot-sync', node_name='disk',
  84                              snapshot_file=overlay,
  85                              snapshot_node_name='overlay')
  86         self.assert_qmp(result, 'return', {})
  87
  88         # on reopen to  r-o base preallocation should be dropped
  89         self.check_small()
  90
  91         self.vm.hmp_qemu_io('drive0', 'write 1M 1M')
  92
  93         result = self.vm.qmp('block-commit', device='overlay')
  94         self.assert_qmp(result, 'return', {})
  95         self.complete_and_wait()
  96
  97         # commit of new megabyte should trigger preallocation
  98         self.check_big()
  99
 100     def test_reopen_opts(self):
 101         result = self.vm.qmp('blockdev-reopen', options=[{
 102             'node-name': 'disk',
 103             'driver': iotests.imgfmt,
 104             'file': {
 105                 'node-name': 'filter',
 106                 'driver': 'preallocate',
 107                 'prealloc-size': 20 * MiB,
 108                 'prealloc-align': 5 * MiB,
 109                 'file': {
 110                     'node-name': 'file',
 111                     'driver': 'file',
 112                     'filename': disk
 113                 }
 114             }
 115         }])
 116         self.assert_qmp(result, 'return', {})
 117
 118         self.vm.hmp_qemu_io('drive0', 'write 0 1M')
 119         self.assertTrue(os.path.getsize(disk) == 25 * MiB)
 120
 121
 122 class TestTruncate(iotests.QMPTestCase):
 123     def setUp(self):
 124         iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB))
 125         iotests.qemu_img_create('-f', iotests.imgfmt, refdisk, str(10 * MiB))
 126
 127     def tearDown(self):
 128         os.remove(disk)
 129         os.remove(refdisk)
 130
 131     def do_test(self, prealloc_mode, new_size):
 132         iotests.qemu_io('--image-opts', '-c', 'write 0 10M', '-c',
 133                         f'truncate -m {prealloc_mode} {new_size}',
 134                         drive_opts)
 135
 136         iotests.qemu_io('-f', iotests.imgfmt, '-c', 'write 0 10M',
 137                         '-c', f'truncate -m {prealloc_mode} {new_size}',
 138                         refdisk)
 139
 140         stat = os.stat(disk)
 141         refstat = os.stat(refdisk)
 142
 143         # The preallocate filter may keep cluster alignment when shrinking,
 144         # so ignore small differences
 145         self.assertLess(abs(stat.st_size - refstat.st_size), 64 * 1024)
 146
 147         # Preallocate filter may leak some internal clusters (for example, if
 148         # guest write far over EOF, skipping some clusters - they will remain
 149         # fallocated, preallocate filter don't care about such leaks, it drops
 150         # only trailing preallocation.
 151         self.assertLess(abs(stat.st_blocks - refstat.st_blocks) * 512,
 152                         1024 * 1024)
 153
 154     def test_real_shrink(self):
 155         self.do_test('off', '5M')
 156
 157     def test_truncate_inside_preallocated_area__falloc(self):
 158         self.do_test('falloc', '50M')
 159
 160     def test_truncate_inside_preallocated_area__metadata(self):
 161         self.do_test('metadata', '50M')
 162
 163     def test_truncate_inside_preallocated_area__full(self):
 164         self.do_test('full', '50M')
 165
 166     def test_truncate_inside_preallocated_area__off(self):
 167         self.do_test('off', '50M')
 168
 169     def test_truncate_over_preallocated_area__falloc(self):
 170         self.do_test('falloc', '150M')
 171
 172     def test_truncate_over_preallocated_area__metadata(self):
 173         self.do_test('metadata', '150M')
 174
 175     def test_truncate_over_preallocated_area__full(self):
 176         self.do_test('full', '150M')
 177
 178     def test_truncate_over_preallocated_area__off(self):
 179         self.do_test('off', '150M')
 180
 181
 182 if __name__ == '__main__':
 183     iotests.main(supported_fmts=['qcow2'], required_fmts=['preallocate'])