tests/qemu-iotests/255

   1 #!/usr/bin/env python
   2 #
   3 # Test commit job graph modifications while requests are active
   4 #
   5 # Copyright (C) 2019 Red Hat, Inc.
   6 #
   7 # Creator/Owner: Kevin Wolf <kwolf@redhat.com>
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 import iotests
  24 from iotests import imgfmt
  25
  26 iotests.verify_image_format(supported_fmts=['qcow2'])
  27
  28 def blockdev_create(vm, options):
  29     result = vm.qmp_log('blockdev-create',
  30                         filters=[iotests.filter_qmp_testfiles],
  31                         job_id='job0', options=options)
  32
  33     if 'return' in result:
  34         assert result['return'] == {}
  35         vm.run_job('job0')
  36     iotests.log("")
  37
  38 with iotests.FilePath('t.qcow2') as disk_path, \
  39      iotests.FilePath('t.qcow2.mid') as mid_path, \
  40      iotests.FilePath('t.qcow2.base') as base_path, \
  41      iotests.VM() as vm:
  42
  43     iotests.log("=== Create backing chain and start VM ===")
  44     iotests.log("")
  45
  46     size = 128 * 1024 * 1024
  47     size_str = str(size)
  48
  49     iotests.create_image(base_path, size)
  50     iotests.qemu_img_log('create', '-f', iotests.imgfmt, mid_path, size_str)
  51     iotests.qemu_img_log('create', '-f', iotests.imgfmt, disk_path, size_str)
  52
  53     # Create a backing chain like this:
  54     # base <- [throttled: bps-read=4096] <- mid <- overlay
  55
  56     vm.add_object('throttle-group,x-bps-read=4096,id=throttle0')
  57     vm.add_blockdev('file,filename=%s,node-name=base' % (base_path))
  58     vm.add_blockdev('throttle,throttle-group=throttle0,file=base,node-name=throttled')
  59     vm.add_blockdev('file,filename=%s,node-name=mid-file' % (mid_path))
  60     vm.add_blockdev('qcow2,file=mid-file,node-name=mid,backing=throttled')
  61     vm.add_drive_raw('if=none,id=overlay,driver=qcow2,file=%s,backing=mid' % (disk_path))
  62
  63     vm.launch()
  64
  65     iotests.log("=== Start background read requests ===")
  66     iotests.log("")
  67
  68     def start_requests():
  69         vm.hmp_qemu_io('overlay', 'aio_read 0 4k')
  70         vm.hmp_qemu_io('overlay', 'aio_read 0 4k')
  71
  72     start_requests()
  73
  74     iotests.log("=== Run a commit job ===")
  75     iotests.log("")
  76
  77     result = vm.qmp_log('block-commit', job_id='job0', auto_finalize=False,
  78                         device='overlay', top_node='mid')
  79
  80     vm.run_job('job0', auto_finalize=False, pre_finalize=start_requests,
  81                 auto_dismiss=True)
  82
  83     vm.shutdown()