68474776f3
In Python 3, several functions now return iterators instead of lists. This includes range(), items(), map(), and filter(). This means that if we really want a list, we have to wrap those instances with list(). But then again, the two instances where this is the case for map() and filter(), there are shorter expressions which work without either function. On the other hand, sometimes we do just want an iterator, in which case we have sometimes used xrange() and iteritems() which no longer exist in Python 3. Just change these calls to be range() and items(), works in both Python 2 and 3, and is really what we want in 3 (which is what matters). But because it is so simple to do (and to find and remove once we completely switch to Python 3), make range() be an alias for xrange() in the two affected tests (044 and 163). In one instance, we only wanted the first instance of the result of a filter() call. Instead of using next(filter()) which would work only in Python 3, or list(filter())[0] which would work everywhere but is a bit weird, this instance is changed to use a generator expression with a next() wrapped around, which works both in 2.7 and 3. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Cleber Rosa <crosa@redhat.com> Message-Id: <20181022135307.14398-6-mreitz@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
122 lines
3.8 KiB
Python
Executable file
122 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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