xref: /openbmc/qemu/tests/qemu-iotests/tests/graph-changes-while-io (revision 800485762e6564e04e2ab315132d477069562d91) 
1#!/usr/bin/env python3
2# group: rw
3#
4# Test graph changes while I/O is happening
5#
6# Copyright (C) 2022 Red Hat, Inc.
7#
8# This program is free software; you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation; either version 2 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program.  If not, see <http://www.gnu.org/licenses/>.
20#
21
22import os
23from threading import Thread
24import iotests
25from iotests import imgfmt, qemu_img, qemu_img_create, qemu_io, \
26        QMPTestCase, QemuStorageDaemon
27
28
29top = os.path.join(iotests.test_dir, 'top.img')
30nbd_sock = os.path.join(iotests.sock_dir, 'nbd.sock')
31
32
33def do_qemu_img_bench(count: int = 2000000) -> None:
34    """
35    Do some I/O requests on `nbd_sock`.
36    """
37    qemu_img('bench', '-f', 'raw', '-c', str(count),
38             f'nbd+unix:///node0?socket={nbd_sock}')
39
40
41class TestGraphChangesWhileIO(QMPTestCase):
42    def setUp(self) -> None:
43        # Create an overlay that can be added at runtime on top of the
44        # null-co block node that will receive I/O
45        qemu_img_create('-f', imgfmt, '-F', 'raw', '-b', 'null-co://', top)
46
47        # QSD instance with a null-co block node in an I/O thread,
48        # exported over NBD (on `nbd_sock`, export name "node0")
49        self.qsd = QemuStorageDaemon(
50            '--object', 'iothread,id=iothread0',
51            '--blockdev', 'null-co,node-name=node0,read-zeroes=true',
52            '--nbd-server', f'addr.type=unix,addr.path={nbd_sock}',
53            '--export', 'nbd,id=exp0,node-name=node0,iothread=iothread0,' +
54                        'fixed-iothread=true,writable=true',
55            qmp=True
56        )
57
58    def tearDown(self) -> None:
59        self.qsd.stop()
60
61    def test_blockdev_add_while_io(self) -> None:
62        # Run qemu-img bench in the background
63        bench_thr = Thread(target=do_qemu_img_bench)
64        bench_thr.start()
65
66        # While qemu-img bench is running, repeatedly add and remove an
67        # overlay to/from node0
68        while bench_thr.is_alive():
69            self.qsd.cmd('blockdev-add', {
70                'driver': imgfmt,
71                'node-name': 'overlay',
72                'backing': 'node0',
73                'file': {
74                    'driver': 'file',
75                    'filename': top
76                }
77            })
78
79            self.qsd.cmd('blockdev-del', {
80                'node-name': 'overlay'
81            })
82
83        bench_thr.join()
84
85    def test_commit_while_io(self) -> None:
86        # Run qemu-img bench in the background
87        bench_thr = Thread(target=do_qemu_img_bench, args=(200000, ))
88        bench_thr.start()
89
90        qemu_io('-c', 'write 0 64k', top)
91        qemu_io('-c', 'write 128k 64k', top)
92
93        self.qsd.cmd('blockdev-add', {
94            'driver': imgfmt,
95            'node-name': 'overlay',
96            'backing': None,
97            'file': {
98                'driver': 'file',
99                'filename': top
100            }
101        })
102
103        self.qsd.cmd('blockdev-snapshot', {
104            'node': 'node0',
105            'overlay': 'overlay',
106        })
107
108        # While qemu-img bench is running, repeatedly commit overlay to node0
109        while bench_thr.is_alive():
110            self.qsd.cmd('block-commit', {
111                'job-id': 'job0',
112                'device': 'overlay',
113            })
114
115            self.qsd.cmd('block-job-cancel', {
116                'device': 'job0',
117            })
118
119            cancelled = False
120            while not cancelled:
121                for event in self.qsd.get_qmp().get_events(wait=10.0):
122                    if event['event'] != 'JOB_STATUS_CHANGE':
123                        continue
124                    if event['data']['status'] == 'null':
125                        cancelled = True
126
127        bench_thr.join()
128
129if __name__ == '__main__':
130    # Format must support raw backing files
131    iotests.main(supported_fmts=['qcow', 'qcow2', 'qed'],
132                 supported_protocols=['file'])
133