Add test for a new backup option: discard-source. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@openvz.org> --- .../qemu-iotests/tests/backup-discard-source | 154 ++++++++++++++++++ .../tests/backup-discard-source.out | 5 + 2 files changed, 159 insertions(+) create mode 100755 tests/qemu-iotests/tests/backup-discard-source create mode 100644 tests/qemu-iotests/tests/backup-discard-source.out
diff --git a/tests/qemu-iotests/tests/backup-discard-source b/tests/qemu-iotests/tests/backup-discard-source new file mode 100755 index 0000000000..d301fbd2d1 --- /dev/null +++ b/tests/qemu-iotests/tests/backup-discard-source @@ -0,0 +1,154 @@ +#!/usr/bin/env python3 +# +# Test removing persistent bitmap from backing +# +# Copyright (c) 2022 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 +from iotests import qemu_img_create, qemu_img_map, qemu_io + + +temp_img = os.path.join(iotests.test_dir, 'temp') +source_img = os.path.join(iotests.test_dir, 'source') +target_img = os.path.join(iotests.test_dir, 'target') +size = '1M' + +def get_actual_size(vm, node_name): + nodes = vm.qmp('query-named-block-nodes', flat=True)['return'] + node = next(n for n in nodes if n['node-name'] == node_name) + return node['image']['actual-size'] + + +class TestBackup(iotests.QMPTestCase): + def setUp(self): + qemu_img_create('-f', iotests.imgfmt, source_img, size) + qemu_img_create('-f', iotests.imgfmt, temp_img, size) + qemu_img_create('-f', iotests.imgfmt, target_img, size) + qemu_io('-c', 'write 0 1M', source_img) + + self.vm = iotests.VM() + self.vm.launch() + + result = self.vm.qmp('blockdev-add', { + 'node-name': 'cbw', + 'driver': 'copy-before-write', + 'file': { + 'driver': iotests.imgfmt, + 'file': { + 'driver': 'file', + 'filename': source_img, + } + }, + 'target': { + 'driver': iotests.imgfmt, + 'discard': 'unmap', + 'node-name': 'temp', + 'file': { + 'driver': 'file', + 'filename': temp_img + } + } + }) + self.assert_qmp(result, 'return', {}) + + result = self.vm.qmp('blockdev-add', { + 'node-name': 'access', + 'discard': 'unmap', + 'driver': 'snapshot-access', + 'file': 'cbw' + }) + self.assert_qmp(result, 'return', {}) + + result = self.vm.qmp('blockdev-add', { + 'driver': iotests.imgfmt, + 'node-name': 'target', + 'file': { + 'driver': 'file', + 'filename': target_img + } + }) + self.assert_qmp(result, 'return', {}) + + self.assertLess(get_actual_size(self.vm, 'temp'), 512 * 1024) + + def tearDown(self): + # That should fail, because region is discarded + self.vm.hmp_qemu_io('access', 'read 0 1M') + + self.vm.shutdown() + + self.assertTrue('read failed: Permission denied' in self.vm.get_log()) + + # Final check that temp image is empty + mapping = qemu_img_map(temp_img) + self.assertEqual(len(mapping), 1) + self.assertEqual(mapping[0]['start'], 0) + self.assertEqual(mapping[0]['length'], 1024 * 1024) + self.assertEqual(mapping[0]['data'], False) + + os.remove(temp_img) + os.remove(source_img) + os.remove(target_img) + + def do_backup(self): + result = self.vm.qmp('blockdev-backup', device='access', + sync='full', target='target', + job_id='backup0', + discard_source=True) + self.assert_qmp(result, 'return', {}) + + self.vm.event_wait(name='BLOCK_JOB_COMPLETED') + + def test_discard_written(self): + """ + 1. Guest writes + 2. copy-before-write operation, data is stored to temp + 3. start backup(discard_source=True), check that data is + removed from temp + """ + # Trigger copy-before-write operation + result = self.vm.hmp_qemu_io('cbw', 'write 0 1M') + self.assert_qmp(result, 'return', '') + + # Check that data is written to temporary image + self.assertGreater(get_actual_size(self.vm, 'temp'), 1024 * 1024) + + self.do_backup() + + def test_discard_cbw(self): + """ + 1. do backup(discard_source=True), which should inform + copy-before-write that data is not needed anymore + 2. Guest writes + 3. Check that copy-before-write operation is not done + """ + self.do_backup() + + # Try trigger copy-before-write operation + result = self.vm.hmp_qemu_io('cbw', 'write 0 1M') + self.assert_qmp(result, 'return', '') + + # Check that data is not written to temporary image, as region + # is discarded from copy-before-write process + self.assertLess(get_actual_size(self.vm, 'temp'), 512 * 1024) + + +if __name__ == '__main__': + iotests.main(supported_fmts=['qcow2'], + supported_protocols=['file']) diff --git a/tests/qemu-iotests/tests/backup-discard-source.out b/tests/qemu-iotests/tests/backup-discard-source.out new file mode 100644 index 0000000000..fbc63e62f8 --- /dev/null +++ b/tests/qemu-iotests/tests/backup-discard-source.out @@ -0,0 +1,5 @@ +.. +---------------------------------------------------------------------- +Ran 2 tests + +OK -- 2.35.1
