LXR qemu/tests/qemu-iotests/044

   1#!/usr/bin/env python3
   2# group: rw
   3#
   4# Tests growing a large refcount table.
   5#
   6# Copyright (C) 2012 Red Hat, Inc.
   7#
   8# This program is free software; you can redistribute it and/or modify
   9# it under the terms of the GNU General Public License as published by
  10# the Free Software Foundation; either version 2 of the License, or
  11# (at your option) any later version.
  12#
  13# This program is distributed in the hope that it will be useful,
  14# but WITHOUT ANY WARRANTY; without even the implied warranty of
  15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16# GNU General Public License for more details.
  17#
  18# You should have received a copy of the GNU General Public License
  19# along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20#
  21
  22import time
  23import os
  24import qcow2
  25from qcow2 import QcowHeader
  26import iotests
  27from iotests import qemu_img, qemu_img_log, qemu_io
  28import struct
  29import subprocess
  30import sys
  31
  32test_img = os.path.join(iotests.test_dir, 'test.img')
  33
  34class TestRefcountTableGrowth(iotests.QMPTestCase):
  35    '''Abstract base class for image mirroring test cases'''
  36
  37    def preallocate(self, name):
  38        fd = open(name, "r+b")
  39        try:
  40            off_reftable = 512
  41            off_refblock = off_reftable + (512 * 512)
  42            off_l1       = off_refblock + (512 * 512 * 64)
  43            off_l2       = off_l1 + (512 * 512 * 4 * 8)
  44            off_data     = off_l2 + (512 * 512 * 4 * 512)
  45
  46            # Write a new header
  47            h = QcowHeader(fd)
  48            h.refcount_table_offset = off_reftable
  49            h.refcount_table_clusters = 512
  50            h.l1_table_offset = off_l1
  51            h.l1_size = 512 * 512 * 4
  52            h.update(fd)
  53
  54            # Write a refcount table
  55            fd.seek(off_reftable)
  56
  57            for i in range(0, h.refcount_table_clusters):
  58                sector = b''.join(struct.pack('>Q',
  59                    off_refblock + i * 64 * 512 + j * 512)
  60                    for j in range(0, 64))
  61                fd.write(sector)
  62
  63            # Write the refcount blocks
  64            assert(fd.tell() == off_refblock)
  65            sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
  66            for block in range(0, h.refcount_table_clusters):
  67                fd.write(sector)
  68
  69            # Write the L1 table
  70            assert(fd.tell() == off_l1)
  71            assert(off_l2 + 512 * h.l1_size == off_data)
  72            table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
  73                for j in range(0, h.l1_size))
  74            fd.write(table)
  75
  76            # Write the L2 tables
  77            assert(fd.tell() == off_l2)
  78            img_file_size = h.refcount_table_clusters * 64 * 256 * 512
  79            remaining = img_file_size - off_data
  80
  81            off = off_data
  82            while remaining > 1024 * 512:
  83                pytable = list((1 << 63) | off + 512 * j
  84                    for j in range(0, 1024))
  85                table = struct.pack('>1024Q', *pytable)
  86                fd.write(table)
  87                remaining = remaining - 1024 * 512
  88                off = off + 1024 * 512
  89
  90            table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
  91                for j in range(0, remaining // 512))
  92            fd.write(table)
  93
  94
  95            # Data
  96            fd.truncate(img_file_size)
  97
  98
  99        finally:
 100            fd.close()
 101
 102
 103    def setUp(self):
 104        qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
 105        self.preallocate(test_img)
 106        pass
 107
 108
 109    def tearDown(self):
 110        os.remove(test_img)
 111        pass
 112
 113    def test_grow_refcount_table(self):
 114        qemu_io('-c', 'write 3800M 1M', test_img)
 115        qemu_img_log('check' , test_img)
 116        pass
 117
 118if __name__ == '__main__':
 119    iotests.activate_logging()
 120    iotests.main(supported_fmts=['qcow2'],
 121                 supported_protocols=['file'],
 122                 unsupported_imgopts=['refcount_bits'])
 123