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#!/usr/bin/env python
#
# Tests growing a large refcount table.
#
# Copyright (C) 2012 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import time
import os
import qcow2
from qcow2 import QcowHeader
import iotests
from iotests import qemu_img, qemu_img_verbose, qemu_io
import struct
import subprocess
test_img = os.path.join(iotests.test_dir, 'test.img')
class TestRefcountTableGrowth(iotests.QMPTestCase):
'''Abstract base class for image mirroring test cases'''
def preallocate(self, name):
fd = open(name, "r+b")
try:
off_reftable = 512
off_refblock = off_reftable + (512 * 512)
off_l1 = off_refblock + (512 * 512 * 64)
off_l2 = off_l1 + (512 * 512 * 4 * 8)
off_data = off_l2 + (512 * 512 * 4 * 512)
# Write a new header
h = QcowHeader(fd)
h.refcount_table_offset = off_reftable
h.refcount_table_clusters = 512
h.l1_table_offset = off_l1
h.l1_size = 512 * 512 * 4
h.update(fd)
# Write a refcount table
fd.seek(off_reftable)
for i in xrange(0, h.refcount_table_clusters):
sector = b''.join(struct.pack('>Q',
off_refblock + i * 64 * 512 + j * 512)
for j in xrange(0, 64))
fd.write(sector)
# Write the refcount blocks
assert(fd.tell() == off_refblock)
sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
for block in xrange(0, h.refcount_table_clusters):
fd.write(sector)
# Write the L1 table
assert(fd.tell() == off_l1)
assert(off_l2 + 512 * h.l1_size == off_data)
table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
for j in xrange(0, h.l1_size))
fd.write(table)
# Write the L2 tables
assert(fd.tell() == off_l2)
img_file_size = h.refcount_table_clusters * 64 * 256 * 512
remaining = img_file_size - off_data
off = off_data
while remaining > 1024 * 512:
pytable = list((1 << 63) | off + 512 * j
for j in xrange(0, 1024))
table = struct.pack('>1024Q', *pytable)
fd.write(table)
remaining = remaining - 1024 * 512
off = off + 1024 * 512
table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
for j in xrange(0, remaining / 512))
fd.write(table)
# Data
fd.truncate(img_file_size)
finally:
fd.close()
def setUp(self):
qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
self.preallocate(test_img)
pass
def tearDown(self):
os.remove(test_img)
pass
def test_grow_refcount_table(self):
qemu_io('-c', 'write 3800M 1M', test_img)
qemu_img_verbose('check' , test_img)
pass
if __name__ == '__main__':
iotests.main(supported_fmts=['qcow2'])
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