tests/qemu-iotests/163

   1 #!/usr/bin/env python
   2 #
   3 # Tests for shrinking images
   4 #
   5 # Copyright (c) 2016-2017 Parallels International GmbH
   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 import os, random, iotests, struct, qcow2
  22 from iotests import qemu_img, qemu_io, image_size
  23
  24 test_img = os.path.join(iotests.test_dir, 'test.img')
  25 check_img = os.path.join(iotests.test_dir, 'check.img')
  26
  27 def size_to_int(str):
  28     suff = ['B', 'K', 'M', 'G', 'T']
  29     return int(str[:-1]) * 1024**suff.index(str[-1:])
  30
  31 class ShrinkBaseClass(iotests.QMPTestCase):
  32     image_len = '128M'
  33     shrink_size = '10M'
  34     chunk_size = '16M'
  35     refcount_bits = '16'
  36
  37     def __qcow2_check(self, filename):
  38         entry_bits = 3
  39         entry_size = 1 << entry_bits
  40         l1_mask = 0x00fffffffffffe00
  41         div_roundup = lambda n, d: (n + d - 1) / d
  42
  43         def split_by_n(data, n):
  44             for x in xrange(0, len(data), n):
  45                 yield struct.unpack('>Q', data[x:x + n])[0] & l1_mask
  46
  47         def check_l1_table(h, l1_data):
  48             l1_list = list(split_by_n(l1_data, entry_size))
  49             real_l1_size = div_roundup(h.size,
  50                                        1 << (h.cluster_bits*2 - entry_size))
  51             used, unused = l1_list[:real_l1_size], l1_list[real_l1_size:]
  52
  53             self.assertTrue(len(used) != 0, "Verifying l1 table content")
  54             self.assertFalse(any(unused), "Verifying l1 table content")
  55
  56         def check_reftable(fd, h, reftable):
  57             for offset in split_by_n(reftable, entry_size):
  58                 if offset != 0:
  59                     fd.seek(offset)
  60                     cluster = fd.read(1 << h.cluster_bits)
  61                     self.assertTrue(any(cluster), "Verifying reftable content")
  62
  63         with open(filename, "rb") as fd:
  64             h = qcow2.QcowHeader(fd)
  65
  66             fd.seek(h.l1_table_offset)
  67             l1_table = fd.read(h.l1_size << entry_bits)
  68
  69             fd.seek(h.refcount_table_offset)
  70             reftable = fd.read(h.refcount_table_clusters << h.cluster_bits)
  71
  72             check_l1_table(h, l1_table)
  73             check_reftable(fd, h, reftable)
  74
  75     def __raw_check(self, filename):
  76         pass
  77
  78     image_check = {
  79         'qcow2' : __qcow2_check,
  80         'raw' : __raw_check
  81     }
  82
  83     def setUp(self):
  84         if iotests.imgfmt == 'raw':
  85             qemu_img('create', '-f', iotests.imgfmt, test_img, self.image_len)
  86             qemu_img('create', '-f', iotests.imgfmt, check_img,
  87                      self.shrink_size)
  88         else:
  89             qemu_img('create', '-f', iotests.imgfmt,
  90                      '-o', 'cluster_size=' + self.cluster_size +
  91                      ',refcount_bits=' + self.refcount_bits,
  92                      test_img, self.image_len)
  93             qemu_img('create', '-f', iotests.imgfmt,
  94                      '-o', 'cluster_size=%s'% self.cluster_size,
  95                      check_img, self.shrink_size)
  96         qemu_io('-c', 'write -P 0xff 0 ' + self.shrink_size, check_img)
  97
  98     def tearDown(self):
  99         os.remove(test_img)
 100         os.remove(check_img)
 101
 102     def image_verify(self):
 103         self.assertEqual(image_size(test_img), image_size(check_img),
 104                          "Verifying image size")
 105         self.image_check[iotests.imgfmt](self, test_img)
 106
 107         if iotests.imgfmt == 'raw':
 108             return
 109         self.assertEqual(qemu_img('check', test_img), 0,
 110                          "Verifying image corruption")
 111
 112     def test_empty_image(self):
 113         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
 114                  self.shrink_size)
 115
 116         self.assertEqual(
 117             qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, test_img),
 118             qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, check_img),
 119             "Verifying image content")
 120
 121         self.image_verify()
 122
 123     def test_sequential_write(self):
 124         for offs in range(0, size_to_int(self.image_len),
 125                           size_to_int(self.chunk_size)):
 126             qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
 127                     test_img)
 128
 129         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
 130                  self.shrink_size)
 131
 132         self.assertEqual(qemu_img("compare", test_img, check_img), 0,
 133                          "Verifying image content")
 134
 135         self.image_verify()
 136
 137     def test_random_write(self):
 138         offs_list = range(0, size_to_int(self.image_len),
 139                           size_to_int(self.chunk_size))
 140         random.shuffle(offs_list)
 141         for offs in offs_list:
 142             qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
 143                     test_img)
 144
 145         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
 146                  self.shrink_size)
 147
 148         self.assertEqual(qemu_img("compare", test_img, check_img), 0,
 149                          "Verifying image content")
 150
 151         self.image_verify()
 152
 153 class TestShrink512(ShrinkBaseClass):
 154     image_len = '3M'
 155     shrink_size = '1M'
 156     chunk_size = '256K'
 157     cluster_size = '512'
 158     refcount_bits = '64'
 159
 160 class TestShrink64K(ShrinkBaseClass):
 161     cluster_size = '64K'
 162
 163 class TestShrink1M(ShrinkBaseClass):
 164     cluster_size = '1M'
 165     refcount_bits = '1'
 166
 167 ShrinkBaseClass = None
 168
 169 if __name__ == '__main__':
 170     iotests.main(supported_fmts=['raw', 'qcow2'])