Re: [Qemu-devel] [PATCH v2 3/9] iotests: add test 255 to check bitmap life after snapshot + commit

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

01.06.2019 2:42, John Snow wrote:
> 
> 
> On 5/31/19 12:31 PM, Vladimir Sementsov-Ogievskiy wrote:
>> Two testcases with persistent bitmaps are not added here, as there are
>> bugs to be fixed soon.
>>
>> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>> ---
>>   tests/qemu-iotests/255     | 84 ++++++++++++++++++++++++++++++++++++++
>>   tests/qemu-iotests/255.out | 17 ++++++++
>>   tests/qemu-iotests/group   |  1 +
>>   3 files changed, 102 insertions(+)
>>   create mode 100755 tests/qemu-iotests/255
>>   create mode 100644 tests/qemu-iotests/255.out
>>
>> diff --git a/tests/qemu-iotests/255 b/tests/qemu-iotests/255
>> new file mode 100755
>> index 0000000000..1b3c081a68
>> --- /dev/null
>> +++ b/tests/qemu-iotests/255
>> @@ -0,0 +1,84 @@
>> +#!/usr/bin/env python
>> +#
>> +# Tests for temporary external snapshot when we have bitmaps.
>> +#
>> +# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
>> +#
>> +# 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 iotests
>> +from iotests import qemu_img_create, file_path, log
>> +
>> +iotests.verify_image_format(supported_fmts=['qcow2'])
>> +
>> +base, top = file_path('base', 'top')
>> +size = 64 * 1024 * 3
>> +
>> +
>> +def print_bitmap(msg, vm):
>> +    result = vm.qmp('query-block')['return'][0]
>> +    if 'dirty-bitmaps' in result:
>> +        bitmap = result['dirty-bitmaps'][0]
>> +        log('{}: name={} dirty-clusters={}'.format(msg, bitmap['name'],
>> +            bitmap['count'] // 64 // 1024))
>> +    else:
>> +        log(msg + ': not found')
>> +
>> +
>> +def test(persistent, restart):
>> +    assert persistent or not restart
>> +    log("\nTestcase {}persistent {} restart\n".format(
>> +            '' if persistent else 'non-', 'with' if restart else 'without'))
>> +
>> +    qemu_img_create('-f', iotests.imgfmt, base, str(size))
>> +
>> +    vm = iotests.VM().add_drive(base)
>> +    vm.launch()
>> +
>> +    vm.qmp_log('block-dirty-bitmap-add', node='drive0', name='bitmap0',
>> +               persistent=persistent)
>> +    vm.hmp_qemu_io('drive0', 'write 0 64K')
>> +    print_bitmap('initial bitmap', vm)
>> +
>> +    vm.qmp_log('blockdev-snapshot-sync', device='drive0', snapshot_file=top,
>> +               format=iotests.imgfmt, filters=[iotests.filter_qmp_testfiles])
>> +    vm.hmp_qemu_io('drive0', 'write 64K 512')
>> +    print_bitmap('check that no bitmaps are in snapshot', vm)
>> +
>> +    if restart:
>> +        log("... Restart ...")
>> +        vm.shutdown()
>> +        vm = iotests.VM().add_drive(top)
>> +        vm.launch()
>> +
>> +    vm.qmp_log('block-commit', device='drive0', top=top,
>> +               filters=[iotests.filter_qmp_testfiles])
>> +    ev = vm.event_wait_log(['BLOCK_JOB_READY', 'BLOCK_JOB_COMPLETED'])
>> +    if (ev['event'] == 'BLOCK_JOB_COMPLETED'):
>> +        vm.shutdown()
>> +        log(vm.get_log())
>> +        exit()
>> +
> 
> What's the purpose of this conditional? what causes the difference in
> behavior that we need to handle it?

COMPLETED here means error. without this conditional, we'll wait 60s in next
event_wait, which is very uncomfortable for debugging. Contrariwise, stop in
this case is a lot better... Of course, it may be safely dropped, as test
passes now.

> 
>> +    vm.qmp_log('block-job-complete', device='drive0')
>> +    vm.event_wait_log('BLOCK_JOB_COMPLETED')
>> +    print_bitmap('check bitmap after commit', vm)
>> +
>> +    vm.hmp_qemu_io('drive0', 'write 128K 64K')
>> +    print_bitmap('check updated bitmap', vm)
>> +
>> +    vm.shutdown()
>> +
>> +
>> +test(persistent=False, restart=False)
>> diff --git a/tests/qemu-iotests/255.out b/tests/qemu-iotests/255.out
>> new file mode 100644
>> index 0000000000..5239d27c46
>> --- /dev/null
>> +++ b/tests/qemu-iotests/255.out
>> @@ -0,0 +1,17 @@
>> +
>> +Testcase non-persistent without restart
>> +
>> +{"execute": "block-dirty-bitmap-add", "arguments": {"name": "bitmap0", "node": "drive0", "persistent": false}}
>> +{"return": {}}
>> +initial bitmap: name=bitmap0 dirty-clusters=1
>> +{"execute": "blockdev-snapshot-sync", "arguments": {"device": "drive0", "format": "qcow2", "snapshot-file": "TEST_DIR/PID-top"}}
>> +{"return": {}}
>> +check that no bitmaps are in snapshot: not found
>> +{"execute": "block-commit", "arguments": {"device": "drive0", "top": "TEST_DIR/PID-top"}}
>> +{"return": {}}
>> +{"data": {"device": "drive0", "len": 65536, "offset": 65536, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_READY", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
>> +{"execute": "block-job-complete", "arguments": {"device": "drive0"}}
>> +{"return": {}}
>> +{"data": {"device": "drive0", "len": 65536, "offset": 65536, "speed": 0, "type": "commit"}, "event": "BLOCK_JOB_COMPLETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
>> +check bitmap after commit: name=bitmap0 dirty-clusters=2
>> +check updated bitmap: name=bitmap0 dirty-clusters=3
>> diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
>> index 859c4b5e9f..88049ad46c 100644
>> --- a/tests/qemu-iotests/group
>> +++ b/tests/qemu-iotests/group
>> @@ -265,3 +265,4 @@
>>   252 rw auto backing quick
>>   253 rw auto quick
>>   254 rw auto backing quick
>> +255 rw auto quick
>>


-- 
Best regards,
Vladimir