3 # Tests growing a large refcount table.
5 # Copyright (C) 2012 Red Hat, Inc.
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.
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.
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/>.
24 from qcow2 import QcowHeader
26 from iotests import qemu_img, qemu_img_verbose, qemu_io
31 test_img = os.path.join(iotests.test_dir, 'test.img')
33 class TestRefcountTableGrowth(iotests.QMPTestCase):
34 '''Abstract base class for image mirroring test cases'''
36 def preallocate(self, name):
37 fd = open(name, "r+b")
40 off_refblock = off_reftable + (512 * 512)
41 off_l1 = off_refblock + (512 * 512 * 64)
42 off_l2 = off_l1 + (512 * 512 * 4 * 8)
43 off_data = off_l2 + (512 * 512 * 4 * 512)
47 h.refcount_table_offset = off_reftable
48 h.refcount_table_clusters = 512
49 h.l1_table_offset = off_l1
50 h.l1_size = 512 * 512 * 4
53 # Write a refcount table
56 for i in range(0, h.refcount_table_clusters):
57 sector = b''.join(struct.pack('>Q',
58 off_refblock + i * 64 * 512 + j * 512)
59 for j in range(0, 64))
62 # Write the refcount blocks
63 assert(fd.tell() == off_refblock)
64 sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
65 for block in range(0, h.refcount_table_clusters):
69 assert(fd.tell() == off_l1)
70 assert(off_l2 + 512 * h.l1_size == off_data)
71 table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
72 for j in range(0, h.l1_size))
76 assert(fd.tell() == off_l2)
77 img_file_size = h.refcount_table_clusters * 64 * 256 * 512
78 remaining = img_file_size - off_data
81 while remaining > 1024 * 512:
82 pytable = list((1 << 63) | off + 512 * j
83 for j in range(0, 1024))
84 table = struct.pack('>1024Q', *pytable)
86 remaining = remaining - 1024 * 512
87 off = off + 1024 * 512
89 table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
90 for j in range(0, remaining // 512))
95 fd.truncate(img_file_size)
103 qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
104 self.preallocate(test_img)
112 def test_grow_refcount_table(self):
113 qemu_io('-c', 'write 3800M 1M', test_img)
114 qemu_img_verbose('check' , test_img)
117 if __name__ == '__main__':
118 iotests.main(supported_fmts=['qcow2'],
119 supported_protocols=['file'])