d2ef210cb8
Actually writing all the content with 512 byte sector size would take forever, therefore build the image file with a Python script and use qemu-io for the last write that actually triggers the refcount table growth. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
118 lines
3.7 KiB
Python
Executable File
118 lines
3.7 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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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 xrange(0, h.refcount_table_clusters):
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sector = ''.join(struct.pack('>Q',
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off_refblock + i * 64 * 512 + j * 512)
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for j in xrange(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 = ''.join(struct.pack('>H', 1) for j in xrange(0, 64 * 256))
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for block in xrange(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 = ''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
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for j in xrange(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 xrange(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 = ''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
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for j in xrange(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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