LXR qemu/tests/qemu-iotests/264

   1#!/usr/bin/env python3
   2# group: rw
   3#
   4# Test nbd reconnect
   5#
   6# Copyright (c) 2019 Virtuozzo International GmbH.
   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 time
  23import os
  24
  25import iotests
  26from iotests import qemu_img_create, file_path, qemu_nbd_popen
  27
  28disk_a, disk_b, nbd_sock = file_path('disk_a', 'disk_b', 'nbd-sock')
  29nbd_uri = 'nbd+unix:///?socket=' + nbd_sock
  30wait_limit = 3.0
  31wait_step = 0.2
  32
  33
  34class TestNbdReconnect(iotests.QMPTestCase):
  35    def init_vm(self, disk_size):
  36        qemu_img_create('-f', iotests.imgfmt, disk_a, str(disk_size))
  37        qemu_img_create('-f', iotests.imgfmt, disk_b, str(disk_size))
  38        self.vm = iotests.VM().add_drive(disk_a)
  39        self.vm.launch()
  40        self.vm.hmp_qemu_io('drive0', 'write 0 {}'.format(disk_size))
  41
  42    def tearDown(self):
  43        self.vm.shutdown()
  44        os.remove(disk_a)
  45        os.remove(disk_b)
  46
  47    def start_job(self, job):
  48        """Stat job with nbd target and kill the server"""
  49        assert job in ('blockdev-backup', 'blockdev-mirror')
  50        with qemu_nbd_popen('-k', nbd_sock, '-f', iotests.imgfmt, disk_b):
  51            result = self.vm.qmp('blockdev-add',
  52                                 **{'node_name': 'backup0',
  53                                    'driver': 'raw',
  54                                    'file': {'driver': 'nbd',
  55                                             'server': {'type': 'unix',
  56                                                        'path': nbd_sock},
  57                                             'reconnect-delay': 10}})
  58            self.assert_qmp(result, 'return', {})
  59            result = self.vm.qmp(job, device='drive0',
  60                                 sync='full', target='backup0',
  61                                 speed=(1 * 1024 * 1024))
  62            self.assert_qmp(result, 'return', {})
  63
  64            # Wait for some progress
  65            t = 0.0
  66            while t < wait_limit:
  67                jobs = self.vm.qmp('query-block-jobs')['return']
  68                if jobs and jobs[0]['offset'] > 0:
  69                    break
  70                time.sleep(wait_step)
  71                t += wait_step
  72
  73            self.assertTrue(jobs and jobs[0]['offset'] > 0)  # job started
  74
  75        jobs = self.vm.qmp('query-block-jobs')['return']
  76        # Check that job is still in progress
  77        self.assertTrue(jobs)
  78        self.assertTrue(jobs[0]['offset'] < jobs[0]['len'])
  79
  80        result = self.vm.qmp('block-job-set-speed', device='drive0', speed=0)
  81        self.assert_qmp(result, 'return', {})
  82
  83        # Emulate server down time for 1 second
  84        time.sleep(1)
  85
  86    def test_backup(self):
  87        size = 5 * 1024 * 1024
  88        self.init_vm(size)
  89        self.start_job('blockdev-backup')
  90
  91        with qemu_nbd_popen('-k', nbd_sock, '-f', iotests.imgfmt, disk_b):
  92            e = self.vm.event_wait('BLOCK_JOB_COMPLETED')
  93            self.assertEqual(e['data']['offset'], size)
  94            result = self.vm.qmp('blockdev-del', node_name='backup0')
  95            self.assert_qmp(result, 'return', {})
  96
  97    def cancel_job(self):
  98        result = self.vm.qmp('block-job-cancel', device='drive0', force=True)
  99        self.assert_qmp(result, 'return', {})
 100
 101        start_t = time.time()
 102        self.vm.event_wait('BLOCK_JOB_CANCELLED')
 103        delta_t = time.time() - start_t
 104        self.assertTrue(delta_t < 2.0)
 105
 106    def test_mirror_cancel(self):
 107        # Mirror speed limit doesn't work well enough, it seems that mirror
 108        # will run many parallel requests anyway. MAX_IN_FLIGHT is 16 and
 109        # MAX_IO_BYTES is 1M in mirror.c, so let's use 20M disk.
 110        self.init_vm(20 * 1024 * 1024)
 111        self.start_job('blockdev-mirror')
 112        self.cancel_job()
 113
 114    def test_backup_cancel(self):
 115        self.init_vm(5 * 1024 * 1024)
 116        self.start_job('blockdev-backup')
 117        self.cancel_job()
 118
 119
 120if __name__ == '__main__':
 121    iotests.main(supported_fmts=['qcow2'])
 122