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
  22 import time
  23 import os
  24
  25 import iotests
  26 from iotests import qemu_img_create, file_path, qemu_nbd_popen
  27
  28 disk_a, disk_b, nbd_sock = file_path('disk_a', 'disk_b', 'nbd-sock')
  29 nbd_uri = 'nbd+unix:///?socket=' + nbd_sock
  30 wait_limit = 3.0
  31 wait_step = 0.2
  32
  33
  34 class 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             self.vm.cmd('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.vm.cmd(job, device='drive0',
  59                         sync='full', target='backup0',
  60                         speed=(1 * 1024 * 1024))
  61
  62             # Wait for some progress
  63             t = 0.0
  64             while t < wait_limit:
  65                 jobs = self.vm.qmp('query-block-jobs')['return']
  66                 if jobs and jobs[0]['offset'] > 0:
  67                     break
  68                 time.sleep(wait_step)
  69                 t += wait_step
  70
  71             self.assertTrue(jobs and jobs[0]['offset'] > 0)  # job started
  72
  73         jobs = self.vm.qmp('query-block-jobs')['return']
  74         # Check that job is still in progress
  75         self.assertTrue(jobs)
  76         self.assertTrue(jobs[0]['offset'] < jobs[0]['len'])
  77
  78         self.vm.cmd('block-job-set-speed', device='drive0', speed=0)
  79
  80         # Emulate server down time for 1 second
  81         time.sleep(1)
  82
  83     def test_backup(self):
  84         size = 5 * 1024 * 1024
  85         self.init_vm(size)
  86         self.start_job('blockdev-backup')
  87
  88         with qemu_nbd_popen('-k', nbd_sock, '-f', iotests.imgfmt, disk_b):
  89             e = self.vm.event_wait('BLOCK_JOB_COMPLETED')
  90             self.assertEqual(e['data']['offset'], size)
  91             self.vm.cmd('blockdev-del', node_name='backup0')
  92
  93     def cancel_job(self):
  94         self.vm.cmd('block-job-cancel', device='drive0', force=True)
  95
  96         start_t = time.time()
  97         self.vm.event_wait('BLOCK_JOB_CANCELLED')
  98         delta_t = time.time() - start_t
  99         self.assertTrue(delta_t < 5.0)
 100
 101     def test_mirror_cancel(self):
 102         # Mirror speed limit doesn't work well enough, it seems that mirror
 103         # will run many parallel requests anyway. MAX_IN_FLIGHT is 16 and
 104         # MAX_IO_BYTES is 1M in mirror.c, so let's use 20M disk.
 105         self.init_vm(20 * 1024 * 1024)
 106         self.start_job('blockdev-mirror')
 107         self.cancel_job()
 108
 109     def test_backup_cancel(self):
 110         self.init_vm(5 * 1024 * 1024)
 111         self.start_job('blockdev-backup')
 112         self.cancel_job()
 113
 114
 115 if __name__ == '__main__':
 116     iotests.main(supported_fmts=['qcow2'])