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
30 test_img = os.path.join(iotests.test_dir, 'test.img')
32 class TestRefcountTableGrowth(iotests.QMPTestCase):
33 '''Abstract base class for image mirroring test cases'''
35 def preallocate(self, name):
36 fd = open(name, "r+b")
39 off_refblock = off_reftable + (512 * 512)
40 off_l1 = off_refblock + (512 * 512 * 64)
41 off_l2 = off_l1 + (512 * 512 * 4 * 8)
42 off_data = off_l2 + (512 * 512 * 4 * 512)
46 h.refcount_table_offset = off_reftable
47 h.refcount_table_clusters = 512
48 h.l1_table_offset = off_l1
49 h.l1_size = 512 * 512 * 4
52 # Write a refcount table
55 for i in xrange(0, h.refcount_table_clusters):
56 sector = ''.join(struct.pack('>Q',
57 off_refblock + i * 64 * 512 + j * 512)
58 for j in xrange(0, 64))
61 # Write the refcount blocks
62 assert(fd.tell() == off_refblock)
63 sector = ''.join(struct.pack('>H', 1) for j in xrange(0, 64 * 256))
64 for block in xrange(0, h.refcount_table_clusters):
68 assert(fd.tell() == off_l1)
69 assert(off_l2 + 512 * h.l1_size == off_data)
70 table = ''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
71 for j in xrange(0, h.l1_size))
75 assert(fd.tell() == off_l2)
76 img_file_size = h.refcount_table_clusters * 64 * 256 * 512
77 remaining = img_file_size - off_data
80 while remaining > 1024 * 512:
81 pytable = list((1 << 63) | off + 512 * j
82 for j in xrange(0, 1024))
83 table = struct.pack('>1024Q', *pytable)
85 remaining = remaining - 1024 * 512
86 off = off + 1024 * 512
88 table = ''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
89 for j in xrange(0, remaining / 512))
94 fd.truncate(img_file_size)
102 qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
103 self.preallocate(test_img)
111 def test_grow_refcount_table(self):
112 qemu_io('-c', 'write 3800M 1M', test_img)
113 qemu_img_verbose('check' , test_img)
116 if __name__ == '__main__':
117 iotests.main(supported_fmts=['qcow2'])