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#!/usr/bin/env python
#
# Tests for shrinking images
#
# Copyright (c) 2016-2017 Parallels International GmbH
#
# 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 os, random, iotests, struct, qcow2
from iotests import qemu_img, qemu_io, image_size
test_img = os.path.join(iotests.test_dir, 'test.img')
check_img = os.path.join(iotests.test_dir, 'check.img')
def size_to_int(str):
suff = ['B', 'K', 'M', 'G', 'T']
return int(str[:-1]) * 1024**suff.index(str[-1:])
class ShrinkBaseClass(iotests.QMPTestCase):
image_len = '128M'
shrink_size = '10M'
chunk_size = '16M'
refcount_bits = '16'
def __qcow2_check(self, filename):
entry_bits = 3
entry_size = 1 << entry_bits
l1_mask = 0x00fffffffffffe00
div_roundup = lambda n, d: (n + d - 1) / d
def split_by_n(data, n):
for x in xrange(0, len(data), n):
yield struct.unpack('>Q', data[x:x + n])[0] & l1_mask
def check_l1_table(h, l1_data):
l1_list = list(split_by_n(l1_data, entry_size))
real_l1_size = div_roundup(h.size,
1 << (h.cluster_bits*2 - entry_size))
used, unused = l1_list[:real_l1_size], l1_list[real_l1_size:]
self.assertTrue(len(used) != 0, "Verifying l1 table content")
self.assertFalse(any(unused), "Verifying l1 table content")
def check_reftable(fd, h, reftable):
for offset in split_by_n(reftable, entry_size):
if offset != 0:
fd.seek(offset)
cluster = fd.read(1 << h.cluster_bits)
self.assertTrue(any(cluster), "Verifying reftable content")
with open(filename, "rb") as fd:
h = qcow2.QcowHeader(fd)
fd.seek(h.l1_table_offset)
l1_table = fd.read(h.l1_size << entry_bits)
fd.seek(h.refcount_table_offset)
reftable = fd.read(h.refcount_table_clusters << h.cluster_bits)
check_l1_table(h, l1_table)
check_reftable(fd, h, reftable)
def __raw_check(self, filename):
pass
image_check = {
'qcow2' : __qcow2_check,
'raw' : __raw_check
}
def setUp(self):
if iotests.imgfmt == 'raw':
qemu_img('create', '-f', iotests.imgfmt, test_img, self.image_len)
qemu_img('create', '-f', iotests.imgfmt, check_img,
self.shrink_size)
else:
qemu_img('create', '-f', iotests.imgfmt,
'-o', 'cluster_size=' + self.cluster_size +
',refcount_bits=' + self.refcount_bits,
test_img, self.image_len)
qemu_img('create', '-f', iotests.imgfmt,
'-o', 'cluster_size=%s'% self.cluster_size,
check_img, self.shrink_size)
qemu_io('-c', 'write -P 0xff 0 ' + self.shrink_size, check_img)
def tearDown(self):
os.remove(test_img)
os.remove(check_img)
def image_verify(self):
self.assertEqual(image_size(test_img), image_size(check_img),
"Verifying image size")
self.image_check[iotests.imgfmt](self, test_img)
if iotests.imgfmt == 'raw':
return
self.assertEqual(qemu_img('check', test_img), 0,
"Verifying image corruption")
def test_empty_image(self):
qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img,
self.shrink_size)
self.assertEqual(
qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, test_img),
qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, check_img),
"Verifying image content")
self.image_verify()
def test_sequential_write(self):
for offs in range(0, size_to_int(self.image_len),
size_to_int(self.chunk_size)):
qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
test_img)
qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img,
self.shrink_size)
self.assertEqual(qemu_img("compare", test_img, check_img), 0,
"Verifying image content")
self.image_verify()
def test_random_write(self):
offs_list = range(0, size_to_int(self.image_len),
size_to_int(self.chunk_size))
random.shuffle(offs_list)
for offs in offs_list:
qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size),
test_img)
qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img,
self.shrink_size)
self.assertEqual(qemu_img("compare", test_img, check_img), 0,
"Verifying image content")
self.image_verify()
class TestShrink512(ShrinkBaseClass):
image_len = '3M'
shrink_size = '1M'
chunk_size = '256K'
cluster_size = '512'
refcount_bits = '64'
class TestShrink64K(ShrinkBaseClass):
cluster_size = '64K'
class TestShrink1M(ShrinkBaseClass):
cluster_size = '1M'
refcount_bits = '1'
ShrinkBaseClass = None
if __name__ == '__main__':
iotests.main(supported_fmts=['raw', 'qcow2'])
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