1#!/usr/bin/env python 2# 3# Tests for shrinking images 4# 5# Copyright (c) 2016-2017 Parallels International GmbH 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 2 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <http://www.gnu.org/licenses/>. 19# 20 21import os, random, iotests, struct, qcow2, sys 22from iotests import qemu_img, qemu_io, image_size 23 24test_img = os.path.join(iotests.test_dir, 'test.img') 25check_img = os.path.join(iotests.test_dir, 'check.img') 26 27def size_to_int(str): 28 suff = ['B', 'K', 'M', 'G', 'T'] 29 return int(str[:-1]) * 1024**suff.index(str[-1:]) 30 31class ShrinkBaseClass(iotests.QMPTestCase): 32 image_len = '128M' 33 shrink_size = '10M' 34 chunk_size = '16M' 35 refcount_bits = '16' 36 37 def __qcow2_check(self, filename): 38 entry_bits = 3 39 entry_size = 1 << entry_bits 40 l1_mask = 0x00fffffffffffe00 41 div_roundup = lambda n, d: (n + d - 1) // d 42 43 def split_by_n(data, n): 44 for x in range(0, len(data), n): 45 yield struct.unpack('>Q', data[x:x + n])[0] & l1_mask 46 47 def check_l1_table(h, l1_data): 48 l1_list = list(split_by_n(l1_data, entry_size)) 49 real_l1_size = div_roundup(h.size, 50 1 << (h.cluster_bits*2 - entry_size)) 51 used, unused = l1_list[:real_l1_size], l1_list[real_l1_size:] 52 53 self.assertTrue(len(used) != 0, "Verifying l1 table content") 54 self.assertFalse(any(unused), "Verifying l1 table content") 55 56 def check_reftable(fd, h, reftable): 57 for offset in split_by_n(reftable, entry_size): 58 if offset != 0: 59 fd.seek(offset) 60 cluster = fd.read(1 << h.cluster_bits) 61 self.assertTrue(any(cluster), "Verifying reftable content") 62 63 with open(filename, "rb") as fd: 64 h = qcow2.QcowHeader(fd) 65 66 fd.seek(h.l1_table_offset) 67 l1_table = fd.read(h.l1_size << entry_bits) 68 69 fd.seek(h.refcount_table_offset) 70 reftable = fd.read(h.refcount_table_clusters << h.cluster_bits) 71 72 check_l1_table(h, l1_table) 73 check_reftable(fd, h, reftable) 74 75 def __raw_check(self, filename): 76 pass 77 78 image_check = { 79 'qcow2' : __qcow2_check, 80 'raw' : __raw_check 81 } 82 83 def setUp(self): 84 if iotests.imgfmt == 'raw': 85 qemu_img('create', '-f', iotests.imgfmt, test_img, self.image_len) 86 qemu_img('create', '-f', iotests.imgfmt, check_img, 87 self.shrink_size) 88 else: 89 qemu_img('create', '-f', iotests.imgfmt, 90 '-o', 'cluster_size=' + self.cluster_size + 91 ',refcount_bits=' + self.refcount_bits, 92 test_img, self.image_len) 93 qemu_img('create', '-f', iotests.imgfmt, 94 '-o', 'cluster_size=%s'% self.cluster_size, 95 check_img, self.shrink_size) 96 qemu_io('-c', 'write -P 0xff 0 ' + self.shrink_size, check_img) 97 98 def tearDown(self): 99 os.remove(test_img) 100 os.remove(check_img) 101 102 def image_verify(self): 103 self.assertEqual(image_size(test_img), image_size(check_img), 104 "Verifying image size") 105 self.image_check[iotests.imgfmt](self, test_img) 106 107 if iotests.imgfmt == 'raw': 108 return 109 self.assertEqual(qemu_img('check', test_img), 0, 110 "Verifying image corruption") 111 112 def test_empty_image(self): 113 qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img, 114 self.shrink_size) 115 116 self.assertEqual( 117 qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, test_img), 118 qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, check_img), 119 "Verifying image content") 120 121 self.image_verify() 122 123 def test_sequential_write(self): 124 for offs in range(0, size_to_int(self.image_len), 125 size_to_int(self.chunk_size)): 126 qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size), 127 test_img) 128 129 qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img, 130 self.shrink_size) 131 132 self.assertEqual(qemu_img("compare", test_img, check_img), 0, 133 "Verifying image content") 134 135 self.image_verify() 136 137 def test_random_write(self): 138 offs_list = list(range(0, size_to_int(self.image_len), 139 size_to_int(self.chunk_size))) 140 random.shuffle(offs_list) 141 for offs in offs_list: 142 qemu_io('-c', 'write -P 0xff %d %s' % (offs, self.chunk_size), 143 test_img) 144 145 qemu_img('resize', '-f', iotests.imgfmt, '--shrink', test_img, 146 self.shrink_size) 147 148 self.assertEqual(qemu_img("compare", test_img, check_img), 0, 149 "Verifying image content") 150 151 self.image_verify() 152 153class TestShrink512(ShrinkBaseClass): 154 image_len = '3M' 155 shrink_size = '1M' 156 chunk_size = '256K' 157 cluster_size = '512' 158 refcount_bits = '64' 159 160class TestShrink64K(ShrinkBaseClass): 161 cluster_size = '64K' 162 163class TestShrink1M(ShrinkBaseClass): 164 cluster_size = '1M' 165 refcount_bits = '1' 166 167ShrinkBaseClass = None 168 169if __name__ == '__main__': 170 iotests.main(supported_fmts=['raw', 'qcow2'], 171 supported_protocols=['file']) 172