tests/qemu-iotests/044

   1 #!/usr/bin/env python3
   2 # group: rw
   3 #
   4 # Tests growing a large refcount table.
   5 #
   6 # Copyright (C) 2012 Red Hat, Inc.
   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 import qcow2
  25 from qcow2 import QcowHeader
  26 import iotests
  27 from iotests import qemu_img, qemu_img_verbose, qemu_io
  28 import struct
  29 import subprocess
  30 import sys
  31
  32 test_img = os.path.join(iotests.test_dir, 'test.img')
  33
  34 class TestRefcountTableGrowth(iotests.QMPTestCase):
  35     '''Abstract base class for image mirroring test cases'''
  36
  37     def preallocate(self, name):
  38         fd = open(name, "r+b")
  39         try:
  40             off_reftable = 512
  41             off_refblock = off_reftable + (512 * 512)
  42             off_l1       = off_refblock + (512 * 512 * 64)
  43             off_l2       = off_l1 + (512 * 512 * 4 * 8)
  44             off_data     = off_l2 + (512 * 512 * 4 * 512)
  45
  46             # Write a new header
  47             h = QcowHeader(fd)
  48             h.refcount_table_offset = off_reftable
  49             h.refcount_table_clusters = 512
  50             h.l1_table_offset = off_l1
  51             h.l1_size = 512 * 512 * 4
  52             h.update(fd)
  53
  54             # Write a refcount table
  55             fd.seek(off_reftable)
  56
  57             for i in range(0, h.refcount_table_clusters):
  58                 sector = b''.join(struct.pack('>Q',
  59                     off_refblock + i * 64 * 512 + j * 512)
  60                     for j in range(0, 64))
  61                 fd.write(sector)
  62
  63             # Write the refcount blocks
  64             assert(fd.tell() == off_refblock)
  65             sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
  66             for block in range(0, h.refcount_table_clusters):
  67                 fd.write(sector)
  68
  69             # Write the L1 table
  70             assert(fd.tell() == off_l1)
  71             assert(off_l2 + 512 * h.l1_size == off_data)
  72             table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
  73                 for j in range(0, h.l1_size))
  74             fd.write(table)
  75
  76             # Write the L2 tables
  77             assert(fd.tell() == off_l2)
  78             img_file_size = h.refcount_table_clusters * 64 * 256 * 512
  79             remaining = img_file_size - off_data
  80
  81             off = off_data
  82             while remaining > 1024 * 512:
  83                 pytable = list((1 << 63) | off + 512 * j
  84                     for j in range(0, 1024))
  85                 table = struct.pack('>1024Q', *pytable)
  86                 fd.write(table)
  87                 remaining = remaining - 1024 * 512
  88                 off = off + 1024 * 512
  89
  90             table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
  91                 for j in range(0, remaining // 512))
  92             fd.write(table)
  93
  94
  95             # Data
  96             fd.truncate(img_file_size)
  97
  98
  99         finally:
 100             fd.close()
 101
 102
 103     def setUp(self):
 104         qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
 105         self.preallocate(test_img)
 106         pass
 107
 108
 109     def tearDown(self):
 110         os.remove(test_img)
 111         pass
 112
 113     def test_grow_refcount_table(self):
 114         qemu_io('-c', 'write 3800M 1M', test_img)
 115         qemu_img_verbose('check' , test_img)
 116         pass
 117
 118 if __name__ == '__main__':
 119     iotests.main(supported_fmts=['qcow2'],
 120                  supported_protocols=['file'])