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+#!/usr/bin/env python3
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+# group: rw auto quick
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+#
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+# Test cases for NBD multi-conn advertisement
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+#
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+# Copyright (C) 2022 Red Hat, Inc.
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+#
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 2 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+import os
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+from contextlib import contextmanager
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+import iotests
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+from iotests import qemu_img_create, qemu_io
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+
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+
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+disk = os.path.join(iotests.test_dir, 'disk')
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+size = '4M'
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+nbd_sock = os.path.join(iotests.sock_dir, 'nbd_sock')
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+nbd_uri = 'nbd+unix:///{}?socket=' + nbd_sock
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+
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+
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+@contextmanager
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+def open_nbd(export_name):
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+ h = nbd.NBD()
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+ try:
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+ h.connect_uri(nbd_uri.format(export_name))
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+ yield h
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+ finally:
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+ h.shutdown()
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+
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+class TestNbdMulticonn(iotests.QMPTestCase):
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+ def setUp(self):
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+ qemu_img_create('-f', iotests.imgfmt, disk, size)
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+ qemu_io('-c', 'w -P 1 0 2M', '-c', 'w -P 2 2M 2M', disk)
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+
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+ self.vm = iotests.VM()
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+ self.vm.launch()
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+ result = self.vm.qmp('blockdev-add', {
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+ 'driver': 'qcow2',
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+ 'node-name': 'n',
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+ 'file': {'driver': 'file', 'filename': disk}
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+ })
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+ self.assert_qmp(result, 'return', {})
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+
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+ def tearDown(self):
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+ self.vm.shutdown()
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+ os.remove(disk)
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+ try:
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+ os.remove(nbd_sock)
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+ except OSError:
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+ pass
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+
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+ @contextmanager
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+ def run_server(self, max_connections=None):
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+ args = {
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+ 'addr': {
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+ 'type': 'unix',
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+ 'data': {'path': nbd_sock}
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+ }
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+ }
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+ if max_connections is not None:
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+ args['max-connections'] = max_connections
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+
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+ result = self.vm.qmp('nbd-server-start', args)
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+ self.assert_qmp(result, 'return', {})
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+ yield
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+
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+ result = self.vm.qmp('nbd-server-stop')
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+ self.assert_qmp(result, 'return', {})
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+
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+ def add_export(self, name, writable=None):
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+ args = {
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+ 'type': 'nbd',
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+ 'id': name,
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+ 'node-name': 'n',
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+ 'name': name,
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+ }
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+ if writable is not None:
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+ args['writable'] = writable
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+
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+ result = self.vm.qmp('block-export-add', args)
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+ self.assert_qmp(result, 'return', {})
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+
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+ def test_default_settings(self):
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+ with self.run_server():
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+ self.add_export('r')
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+ self.add_export('w', writable=True)
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+ with open_nbd('r') as h:
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+ self.assertTrue(h.can_multi_conn())
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+ with open_nbd('w') as h:
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+ self.assertTrue(h.can_multi_conn())
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+
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+ def test_limited_connections(self):
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+ with self.run_server(max_connections=1):
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+ self.add_export('r')
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+ self.add_export('w', writable=True)
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+ with open_nbd('r') as h:
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+ self.assertFalse(h.can_multi_conn())
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+ with open_nbd('w') as h:
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+ self.assertFalse(h.can_multi_conn())
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+
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+ def test_parallel_writes(self):
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+ with self.run_server():
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+ self.add_export('w', writable=True)
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+
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+ clients = [nbd.NBD() for _ in range(3)]
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+ for c in clients:
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+ c.connect_uri(nbd_uri.format('w'))
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+ self.assertTrue(c.can_multi_conn())
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+
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+ initial_data = clients[0].pread(1024 * 1024, 0)
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+ self.assertEqual(initial_data, b'\x01' * 1024 * 1024)
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+
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+ updated_data = b'\x03' * 1024 * 1024
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+ clients[1].pwrite(updated_data, 0)
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+ clients[2].flush()
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+ current_data = clients[0].pread(1024 * 1024, 0)
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+
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+ self.assertEqual(updated_data, current_data)
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+
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+ for i in range(3):
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+ clients[i].shutdown()
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+
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+
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+if __name__ == '__main__':
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+ try:
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+ # Easier to use libnbd than to try and set up parallel
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+ # 'qemu-nbd --list' or 'qemu-io' processes, but not all systems
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+ # have libnbd installed.
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+ import nbd # type: ignore
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+
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+ iotests.main(supported_fmts=['qcow2'])
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+ except ImportError:
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+ iotests.notrun('libnbd not installed')
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Eric Blake