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-rwxr-xr-xqemu/tests/qemu-iotests/044117
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diff --git a/qemu/tests/qemu-iotests/044 b/qemu/tests/qemu-iotests/044
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+++ b/qemu/tests/qemu-iotests/044
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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 = ''.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 = ''.join(struct.pack('>H', 1) for j in xrange(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 = ''.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 = ''.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'])