103cbc771e
Most of our Python unittest-style tests only support the file protocol. You can run them with any other protocol, but the test will simply ignore your choice and use file anyway. We should let them signal that they require the file protocol so they are skipped when you want to test some other protocol. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
123 lines
3.8 KiB
Python
Executable file
123 lines
3.8 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Tests growing a large refcount table.
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#
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# Copyright (C) 2012 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import time
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import os
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import qcow2
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from qcow2 import QcowHeader
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import iotests
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from iotests import qemu_img, qemu_img_verbose, qemu_io
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import struct
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import subprocess
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import sys
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if sys.version_info.major == 2:
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range = xrange
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test_img = os.path.join(iotests.test_dir, 'test.img')
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class TestRefcountTableGrowth(iotests.QMPTestCase):
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'''Abstract base class for image mirroring test cases'''
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def preallocate(self, name):
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fd = open(name, "r+b")
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try:
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off_reftable = 512
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off_refblock = off_reftable + (512 * 512)
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off_l1 = off_refblock + (512 * 512 * 64)
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off_l2 = off_l1 + (512 * 512 * 4 * 8)
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off_data = off_l2 + (512 * 512 * 4 * 512)
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# Write a new header
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h = QcowHeader(fd)
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h.refcount_table_offset = off_reftable
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h.refcount_table_clusters = 512
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h.l1_table_offset = off_l1
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h.l1_size = 512 * 512 * 4
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h.update(fd)
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# Write a refcount table
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fd.seek(off_reftable)
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for i in range(0, h.refcount_table_clusters):
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sector = b''.join(struct.pack('>Q',
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off_refblock + i * 64 * 512 + j * 512)
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for j in range(0, 64))
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fd.write(sector)
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# Write the refcount blocks
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assert(fd.tell() == off_refblock)
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sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
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for block in range(0, h.refcount_table_clusters):
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fd.write(sector)
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# Write the L1 table
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assert(fd.tell() == off_l1)
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assert(off_l2 + 512 * h.l1_size == off_data)
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table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
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for j in range(0, h.l1_size))
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fd.write(table)
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# Write the L2 tables
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assert(fd.tell() == off_l2)
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img_file_size = h.refcount_table_clusters * 64 * 256 * 512
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remaining = img_file_size - off_data
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off = off_data
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while remaining > 1024 * 512:
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pytable = list((1 << 63) | off + 512 * j
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for j in range(0, 1024))
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table = struct.pack('>1024Q', *pytable)
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fd.write(table)
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remaining = remaining - 1024 * 512
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off = off + 1024 * 512
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table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
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for j in range(0, remaining // 512))
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fd.write(table)
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# Data
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fd.truncate(img_file_size)
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finally:
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fd.close()
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def setUp(self):
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qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
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self.preallocate(test_img)
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pass
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def tearDown(self):
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os.remove(test_img)
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pass
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def test_grow_refcount_table(self):
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qemu_io('-c', 'write 3800M 1M', test_img)
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qemu_img_verbose('check' , test_img)
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pass
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if __name__ == '__main__':
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iotests.main(supported_fmts=['qcow2'],
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supported_protocols=['file'])
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