tests/qemu-iotests/165

   1 #!/usr/bin/env python
   2 #
   3 # Tests for persistent dirty bitmaps.
   4 #
   5 # Copyright: Vladimir Sementsov-Ogievskiy 2015-2017
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 from __future__ import print_function
  22 import os
  23 import re
  24 import iotests
  25 from iotests import qemu_img
  26
  27 disk = os.path.join(iotests.test_dir, 'disk')
  28 disk_size = 0x40000000 # 1G
  29
  30 # regions for qemu_io: (start, count) in bytes
  31 regions1 = ((0x0fff00, 0x10000),
  32             (0x200000, 0x100000))
  33
  34 regions2 = ((0x10000000, 0x20000),
  35             (0x3fff0000, 0x10000))
  36
  37 class TestPersistentDirtyBitmap(iotests.QMPTestCase):
  38
  39     def setUp(self):
  40         qemu_img('create', '-f', iotests.imgfmt, disk, str(disk_size))
  41
  42     def tearDown(self):
  43         os.remove(disk)
  44
  45     def mkVm(self):
  46         return iotests.VM().add_drive(disk, opts='node-name=node0')
  47
  48     def mkVmRo(self):
  49         return iotests.VM().add_drive(disk, opts='readonly=on,node-name=node0')
  50
  51     def getSha256(self):
  52         result = self.vm.qmp('x-debug-block-dirty-bitmap-sha256',
  53                              node='drive0', name='bitmap0')
  54         return result['return']['sha256']
  55
  56     def checkBitmap(self, sha256):
  57         result = self.vm.qmp('x-debug-block-dirty-bitmap-sha256',
  58                              node='drive0', name='bitmap0')
  59         self.assert_qmp(result, 'return/sha256', sha256);
  60
  61     def writeRegions(self, regions):
  62         for r in regions:
  63             self.vm.hmp_qemu_io('drive0',
  64                                 'write %d %d' % r)
  65
  66     def qmpAddBitmap(self):
  67         self.vm.qmp('block-dirty-bitmap-add', node='drive0',
  68                     name='bitmap0', persistent=True)
  69
  70     def test_persistent(self):
  71         self.vm = self.mkVm()
  72         self.vm.launch()
  73         self.qmpAddBitmap()
  74
  75         self.writeRegions(regions1)
  76         sha256 = self.getSha256()
  77
  78         self.vm.shutdown()
  79
  80         self.vm = self.mkVmRo()
  81         self.vm.launch()
  82         self.vm.shutdown()
  83
  84         #catch 'Persistent bitmaps are lost' possible error
  85         log = self.vm.get_log()
  86         log = re.sub(r'^\[I \d+\.\d+\] OPENED\n', '', log)
  87         log = re.sub(r'\[I \+\d+\.\d+\] CLOSED\n?$', '', log)
  88         if log:
  89             print(log)
  90
  91         self.vm = self.mkVm()
  92         self.vm.launch()
  93
  94         self.checkBitmap(sha256)
  95         self.writeRegions(regions2)
  96         sha256 = self.getSha256()
  97
  98         self.vm.shutdown()
  99         self.vm.launch()
 100
 101         self.checkBitmap(sha256)
 102
 103         self.vm.shutdown()
 104
 105     def test_reopen_rw(self):
 106         self.vm = self.mkVm()
 107         self.vm.launch()
 108         self.qmpAddBitmap()
 109
 110         # Calculate hashes
 111
 112         self.writeRegions(regions1)
 113         sha256_1 = self.getSha256()
 114
 115         self.writeRegions(regions2)
 116         sha256_2 = self.getSha256()
 117         assert sha256_1 != sha256_2 # Otherwise, it's not very interesting.
 118
 119         result = self.vm.qmp('block-dirty-bitmap-clear', node='drive0',
 120                              name='bitmap0')
 121         self.assert_qmp(result, 'return', {})
 122
 123         # Start with regions1
 124
 125         self.writeRegions(regions1)
 126         assert sha256_1 == self.getSha256()
 127
 128         self.vm.shutdown()
 129
 130         self.vm = self.mkVmRo()
 131         self.vm.launch()
 132
 133         assert sha256_1 == self.getSha256()
 134
 135         # Check that we are in RO mode and can't modify bitmap.
 136         self.writeRegions(regions2)
 137         assert sha256_1 == self.getSha256()
 138
 139         # Reopen to RW
 140         result = self.vm.qmp('x-blockdev-reopen', **{
 141             'node-name': 'node0',
 142             'driver': iotests.imgfmt,
 143             'file': {
 144                 'driver': 'file',
 145                 'filename': disk
 146             },
 147             'read-only': False
 148         })
 149         self.assert_qmp(result, 'return', {})
 150
 151         # Check that bitmap is reopened to RW and we can write to it.
 152         self.writeRegions(regions2)
 153         assert sha256_2 == self.getSha256()
 154
 155         self.vm.shutdown()
 156
 157
 158 if __name__ == '__main__':
 159     iotests.main(supported_fmts=['qcow2'],
 160                  supported_protocols=['file'])