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#!/usr/bin/env python3
#
# Test for preallocate filter
#
# Copyright (c) 2020 Virtuozzo International 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
MiB = 1024 * 1024
disk = os.path.join(iotests.test_dir, 'disk')
overlay = os.path.join(iotests.test_dir, 'overlay')
refdisk = os.path.join(iotests.test_dir, 'refdisk')
drive_opts = f'node-name=disk,driver={iotests.imgfmt},' \
f'file.node-name=filter,file.driver=preallocate,' \
f'file.file.node-name=file,file.file.filename={disk}'
class TestPreallocateBase(iotests.QMPTestCase):
def setUp(self):
iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB))
def tearDown(self):
try:
self.check_small()
check = iotests.qemu_img_check(disk)
self.assertFalse('leaks' in check)
self.assertFalse('corruptions' in check)
self.assertEqual(check['check-errors'], 0)
finally:
os.remove(disk)
def check_big(self):
self.assertTrue(os.path.getsize(disk) > 100 * MiB)
def check_small(self):
self.assertTrue(os.path.getsize(disk) < 10 * MiB)
class TestQemuImg(TestPreallocateBase):
def test_qemu_img(self):
p = iotests.QemuIoInteractive('--image-opts', drive_opts)
p.cmd('write 0 1M')
p.cmd('flush')
self.check_big()
p.close()
class TestPreallocateFilter(TestPreallocateBase):
def setUp(self):
super().setUp()
self.vm = iotests.VM().add_drive(path=None, opts=drive_opts)
self.vm.launch()
def tearDown(self):
self.vm.shutdown()
super().tearDown()
def test_prealloc(self):
self.vm.hmp_qemu_io('drive0', 'write 0 1M')
self.check_big()
def test_external_snapshot(self):
self.test_prealloc()
result = self.vm.qmp('blockdev-snapshot-sync', node_name='disk',
snapshot_file=overlay,
snapshot_node_name='overlay')
self.assert_qmp(result, 'return', {})
# on reopen to r-o base preallocation should be dropped
self.check_small()
self.vm.hmp_qemu_io('drive0', 'write 1M 1M')
result = self.vm.qmp('block-commit', device='overlay')
self.assert_qmp(result, 'return', {})
self.complete_and_wait()
# commit of new megabyte should trigger preallocation
self.check_big()
def test_reopen_opts(self):
result = self.vm.qmp('blockdev-reopen', options=[{
'node-name': 'disk',
'driver': iotests.imgfmt,
'file': {
'node-name': 'filter',
'driver': 'preallocate',
'prealloc-size': 20 * MiB,
'prealloc-align': 5 * MiB,
'file': {
'node-name': 'file',
'driver': 'file',
'filename': disk
}
}
}])
self.assert_qmp(result, 'return', {})
self.vm.hmp_qemu_io('drive0', 'write 0 1M')
self.assertTrue(os.path.getsize(disk) == 25 * MiB)
class TestTruncate(iotests.QMPTestCase):
def setUp(self):
iotests.qemu_img_create('-f', iotests.imgfmt, disk, str(10 * MiB))
iotests.qemu_img_create('-f', iotests.imgfmt, refdisk, str(10 * MiB))
def tearDown(self):
os.remove(disk)
os.remove(refdisk)
def do_test(self, prealloc_mode, new_size):
iotests.qemu_io('--image-opts', '-c', 'write 0 10M', '-c',
f'truncate -m {prealloc_mode} {new_size}',
drive_opts)
iotests.qemu_io('-f', iotests.imgfmt, '-c', 'write 0 10M',
'-c', f'truncate -m {prealloc_mode} {new_size}',
refdisk)
stat = os.stat(disk)
refstat = os.stat(refdisk)
# Probably we'll want preallocate filter to keep align to cluster when
# shrink preallocation, so, ignore small differece
self.assertLess(abs(stat.st_size - refstat.st_size), 64 * 1024)
# Preallocate filter may leak some internal clusters (for example, if
# guest write far over EOF, skipping some clusters - they will remain
# fallocated, preallocate filter don't care about such leaks, it drops
# only trailing preallocation.
self.assertLess(abs(stat.st_blocks - refstat.st_blocks) * 512,
1024 * 1024)
def test_real_shrink(self):
self.do_test('off', '5M')
def test_truncate_inside_preallocated_area__falloc(self):
self.do_test('falloc', '50M')
def test_truncate_inside_preallocated_area__metadata(self):
self.do_test('metadata', '50M')
def test_truncate_inside_preallocated_area__full(self):
self.do_test('full', '50M')
def test_truncate_inside_preallocated_area__off(self):
self.do_test('off', '50M')
def test_truncate_over_preallocated_area__falloc(self):
self.do_test('falloc', '150M')
def test_truncate_over_preallocated_area__metadata(self):
self.do_test('metadata', '150M')
def test_truncate_over_preallocated_area__full(self):
self.do_test('full', '150M')
def test_truncate_over_preallocated_area__off(self):
self.do_test('off', '150M')
if __name__ == '__main__':
iotests.main(supported_fmts=['qcow2'], required_fmts=['preallocate'])
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