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1 | ea2384d3 | bellard | /*
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2 | ea2384d3 | bellard | * Block driver for the QCOW format
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3 | ea2384d3 | bellard | *
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4 | ea2384d3 | bellard | * Copyright (c) 2004 Fabrice Bellard
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5 | ea2384d3 | bellard | *
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6 | ea2384d3 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | ea2384d3 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | ea2384d3 | bellard | * in the Software without restriction, including without limitation the rights
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9 | ea2384d3 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | ea2384d3 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | ea2384d3 | bellard | * furnished to do so, subject to the following conditions:
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12 | ea2384d3 | bellard | *
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13 | ea2384d3 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | ea2384d3 | bellard | * all copies or substantial portions of the Software.
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15 | ea2384d3 | bellard | *
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16 | ea2384d3 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | ea2384d3 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | ea2384d3 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | ea2384d3 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | ea2384d3 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | ea2384d3 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | ea2384d3 | bellard | * THE SOFTWARE.
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23 | ea2384d3 | bellard | */
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24 | ea2384d3 | bellard | #include "vl.h" |
25 | ea2384d3 | bellard | #include "block_int.h" |
26 | 28d34b82 | bellard | #include <zlib.h> |
27 | ea2384d3 | bellard | #include "aes.h" |
28 | ea2384d3 | bellard | |
29 | ea2384d3 | bellard | /**************************************************************/
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30 | ea2384d3 | bellard | /* QEMU COW block driver with compression and encryption support */
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31 | ea2384d3 | bellard | |
32 | ea2384d3 | bellard | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
33 | ea2384d3 | bellard | #define QCOW_VERSION 1 |
34 | ea2384d3 | bellard | |
35 | ea2384d3 | bellard | #define QCOW_CRYPT_NONE 0 |
36 | ea2384d3 | bellard | #define QCOW_CRYPT_AES 1 |
37 | ea2384d3 | bellard | |
38 | ea2384d3 | bellard | #define QCOW_OFLAG_COMPRESSED (1LL << 63) |
39 | ea2384d3 | bellard | |
40 | ea2384d3 | bellard | typedef struct QCowHeader { |
41 | ea2384d3 | bellard | uint32_t magic; |
42 | ea2384d3 | bellard | uint32_t version; |
43 | ea2384d3 | bellard | uint64_t backing_file_offset; |
44 | ea2384d3 | bellard | uint32_t backing_file_size; |
45 | ea2384d3 | bellard | uint32_t mtime; |
46 | ea2384d3 | bellard | uint64_t size; /* in bytes */
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47 | ea2384d3 | bellard | uint8_t cluster_bits; |
48 | ea2384d3 | bellard | uint8_t l2_bits; |
49 | ea2384d3 | bellard | uint32_t crypt_method; |
50 | ea2384d3 | bellard | uint64_t l1_table_offset; |
51 | ea2384d3 | bellard | } QCowHeader; |
52 | ea2384d3 | bellard | |
53 | ea2384d3 | bellard | #define L2_CACHE_SIZE 16 |
54 | ea2384d3 | bellard | |
55 | ea2384d3 | bellard | typedef struct BDRVQcowState { |
56 | ea2384d3 | bellard | int fd;
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57 | ea2384d3 | bellard | int cluster_bits;
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58 | ea2384d3 | bellard | int cluster_size;
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59 | ea2384d3 | bellard | int cluster_sectors;
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60 | ea2384d3 | bellard | int l2_bits;
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61 | ea2384d3 | bellard | int l2_size;
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62 | ea2384d3 | bellard | int l1_size;
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63 | ea2384d3 | bellard | uint64_t cluster_offset_mask; |
64 | ea2384d3 | bellard | uint64_t l1_table_offset; |
65 | ea2384d3 | bellard | uint64_t *l1_table; |
66 | ea2384d3 | bellard | uint64_t *l2_cache; |
67 | ea2384d3 | bellard | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; |
68 | ea2384d3 | bellard | uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
69 | ea2384d3 | bellard | uint8_t *cluster_cache; |
70 | ea2384d3 | bellard | uint8_t *cluster_data; |
71 | ea2384d3 | bellard | uint64_t cluster_cache_offset; |
72 | ea2384d3 | bellard | uint32_t crypt_method; /* current crypt method, 0 if no key yet */
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73 | ea2384d3 | bellard | uint32_t crypt_method_header; |
74 | ea2384d3 | bellard | AES_KEY aes_encrypt_key; |
75 | ea2384d3 | bellard | AES_KEY aes_decrypt_key; |
76 | ea2384d3 | bellard | } BDRVQcowState; |
77 | ea2384d3 | bellard | |
78 | ea2384d3 | bellard | static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset); |
79 | ea2384d3 | bellard | |
80 | ea2384d3 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
81 | ea2384d3 | bellard | { |
82 | ea2384d3 | bellard | const QCowHeader *cow_header = (const void *)buf; |
83 | ea2384d3 | bellard | |
84 | ea2384d3 | bellard | if (be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
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85 | ea2384d3 | bellard | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
86 | ea2384d3 | bellard | return 100; |
87 | ea2384d3 | bellard | else
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88 | ea2384d3 | bellard | return 0; |
89 | ea2384d3 | bellard | } |
90 | ea2384d3 | bellard | |
91 | ea2384d3 | bellard | static int qcow_open(BlockDriverState *bs, const char *filename) |
92 | ea2384d3 | bellard | { |
93 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
94 | ea2384d3 | bellard | int fd, len, i, shift;
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95 | ea2384d3 | bellard | QCowHeader header; |
96 | ea2384d3 | bellard | |
97 | ea2384d3 | bellard | fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); |
98 | ea2384d3 | bellard | if (fd < 0) { |
99 | ea2384d3 | bellard | fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
100 | ea2384d3 | bellard | if (fd < 0) |
101 | ea2384d3 | bellard | return -1; |
102 | ea2384d3 | bellard | } |
103 | ea2384d3 | bellard | s->fd = fd; |
104 | ea2384d3 | bellard | if (read(fd, &header, sizeof(header)) != sizeof(header)) |
105 | ea2384d3 | bellard | goto fail;
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106 | ea2384d3 | bellard | be32_to_cpus(&header.magic); |
107 | ea2384d3 | bellard | be32_to_cpus(&header.version); |
108 | ea2384d3 | bellard | be64_to_cpus(&header.backing_file_offset); |
109 | ea2384d3 | bellard | be32_to_cpus(&header.backing_file_size); |
110 | ea2384d3 | bellard | be32_to_cpus(&header.mtime); |
111 | ea2384d3 | bellard | be64_to_cpus(&header.size); |
112 | ea2384d3 | bellard | be32_to_cpus(&header.crypt_method); |
113 | ea2384d3 | bellard | be64_to_cpus(&header.l1_table_offset); |
114 | ea2384d3 | bellard | |
115 | ea2384d3 | bellard | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
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116 | ea2384d3 | bellard | goto fail;
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117 | ea2384d3 | bellard | if (header.size <= 1 || header.cluster_bits < 9) |
118 | ea2384d3 | bellard | goto fail;
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119 | ea2384d3 | bellard | if (header.crypt_method > QCOW_CRYPT_AES)
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120 | ea2384d3 | bellard | goto fail;
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121 | ea2384d3 | bellard | s->crypt_method_header = header.crypt_method; |
122 | ea2384d3 | bellard | if (s->crypt_method_header)
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123 | ea2384d3 | bellard | bs->encrypted = 1;
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124 | ea2384d3 | bellard | s->cluster_bits = header.cluster_bits; |
125 | ea2384d3 | bellard | s->cluster_size = 1 << s->cluster_bits;
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126 | ea2384d3 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
127 | ea2384d3 | bellard | s->l2_bits = header.l2_bits; |
128 | ea2384d3 | bellard | s->l2_size = 1 << s->l2_bits;
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129 | ea2384d3 | bellard | bs->total_sectors = header.size / 512;
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130 | ea2384d3 | bellard | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; |
131 | ea2384d3 | bellard | |
132 | ea2384d3 | bellard | /* read the level 1 table */
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133 | ea2384d3 | bellard | shift = s->cluster_bits + s->l2_bits; |
134 | ea2384d3 | bellard | s->l1_size = (header.size + (1LL << shift) - 1) >> shift; |
135 | ea2384d3 | bellard | |
136 | ea2384d3 | bellard | s->l1_table_offset = header.l1_table_offset; |
137 | ea2384d3 | bellard | s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
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138 | ea2384d3 | bellard | if (!s->l1_table)
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139 | ea2384d3 | bellard | goto fail;
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140 | d5249393 | bellard | lseek(fd, s->l1_table_offset, SEEK_SET); |
141 | ea2384d3 | bellard | if (read(fd, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
142 | ea2384d3 | bellard | s->l1_size * sizeof(uint64_t))
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143 | ea2384d3 | bellard | goto fail;
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144 | ea2384d3 | bellard | for(i = 0;i < s->l1_size; i++) { |
145 | ea2384d3 | bellard | be64_to_cpus(&s->l1_table[i]); |
146 | ea2384d3 | bellard | } |
147 | ea2384d3 | bellard | /* alloc L2 cache */
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148 | ea2384d3 | bellard | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
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149 | ea2384d3 | bellard | if (!s->l2_cache)
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150 | ea2384d3 | bellard | goto fail;
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151 | ea2384d3 | bellard | s->cluster_cache = qemu_malloc(s->cluster_size); |
152 | ea2384d3 | bellard | if (!s->cluster_cache)
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153 | ea2384d3 | bellard | goto fail;
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154 | ea2384d3 | bellard | s->cluster_data = qemu_malloc(s->cluster_size); |
155 | ea2384d3 | bellard | if (!s->cluster_data)
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156 | ea2384d3 | bellard | goto fail;
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157 | ea2384d3 | bellard | s->cluster_cache_offset = -1;
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158 | ea2384d3 | bellard | |
159 | ea2384d3 | bellard | /* read the backing file name */
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160 | ea2384d3 | bellard | if (header.backing_file_offset != 0) { |
161 | ea2384d3 | bellard | len = header.backing_file_size; |
162 | ea2384d3 | bellard | if (len > 1023) |
163 | ea2384d3 | bellard | len = 1023;
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164 | d5249393 | bellard | lseek(fd, header.backing_file_offset, SEEK_SET); |
165 | ea2384d3 | bellard | if (read(fd, bs->backing_file, len) != len)
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166 | ea2384d3 | bellard | goto fail;
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167 | ea2384d3 | bellard | bs->backing_file[len] = '\0';
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168 | ea2384d3 | bellard | } |
169 | ea2384d3 | bellard | return 0; |
170 | ea2384d3 | bellard | |
171 | ea2384d3 | bellard | fail:
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172 | ea2384d3 | bellard | qemu_free(s->l1_table); |
173 | ea2384d3 | bellard | qemu_free(s->l2_cache); |
174 | ea2384d3 | bellard | qemu_free(s->cluster_cache); |
175 | ea2384d3 | bellard | qemu_free(s->cluster_data); |
176 | ea2384d3 | bellard | close(fd); |
177 | ea2384d3 | bellard | return -1; |
178 | ea2384d3 | bellard | } |
179 | ea2384d3 | bellard | |
180 | ea2384d3 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
181 | ea2384d3 | bellard | { |
182 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
183 | ea2384d3 | bellard | uint8_t keybuf[16];
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184 | ea2384d3 | bellard | int len, i;
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185 | ea2384d3 | bellard | |
186 | ea2384d3 | bellard | memset(keybuf, 0, 16); |
187 | ea2384d3 | bellard | len = strlen(key); |
188 | ea2384d3 | bellard | if (len > 16) |
189 | ea2384d3 | bellard | len = 16;
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190 | ea2384d3 | bellard | /* XXX: we could compress the chars to 7 bits to increase
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191 | ea2384d3 | bellard | entropy */
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192 | ea2384d3 | bellard | for(i = 0;i < len;i++) { |
193 | ea2384d3 | bellard | keybuf[i] = key[i]; |
194 | ea2384d3 | bellard | } |
195 | ea2384d3 | bellard | s->crypt_method = s->crypt_method_header; |
196 | ea2384d3 | bellard | |
197 | ea2384d3 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
198 | ea2384d3 | bellard | return -1; |
199 | ea2384d3 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
200 | ea2384d3 | bellard | return -1; |
201 | ea2384d3 | bellard | #if 0
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202 | ea2384d3 | bellard | /* test */
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203 | ea2384d3 | bellard | {
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204 | ea2384d3 | bellard | uint8_t in[16];
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205 | ea2384d3 | bellard | uint8_t out[16];
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206 | ea2384d3 | bellard | uint8_t tmp[16];
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207 | ea2384d3 | bellard | for(i=0;i<16;i++)
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208 | ea2384d3 | bellard | in[i] = i;
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209 | ea2384d3 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
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210 | ea2384d3 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
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211 | ea2384d3 | bellard | for(i = 0; i < 16; i++)
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212 | ea2384d3 | bellard | printf(" %02x", tmp[i]);
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213 | ea2384d3 | bellard | printf("\n");
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214 | ea2384d3 | bellard | for(i = 0; i < 16; i++)
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215 | ea2384d3 | bellard | printf(" %02x", out[i]);
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216 | ea2384d3 | bellard | printf("\n");
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217 | ea2384d3 | bellard | }
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218 | ea2384d3 | bellard | #endif
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219 | ea2384d3 | bellard | return 0; |
220 | ea2384d3 | bellard | } |
221 | ea2384d3 | bellard | |
222 | ea2384d3 | bellard | /* The crypt function is compatible with the linux cryptoloop
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223 | ea2384d3 | bellard | algorithm for < 4 GB images. NOTE: out_buf == in_buf is
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224 | ea2384d3 | bellard | supported */
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225 | ea2384d3 | bellard | static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num, |
226 | ea2384d3 | bellard | uint8_t *out_buf, const uint8_t *in_buf,
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227 | ea2384d3 | bellard | int nb_sectors, int enc, |
228 | ea2384d3 | bellard | const AES_KEY *key)
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229 | ea2384d3 | bellard | { |
230 | ea2384d3 | bellard | union {
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231 | ea2384d3 | bellard | uint64_t ll[2];
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232 | ea2384d3 | bellard | uint8_t b[16];
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233 | ea2384d3 | bellard | } ivec; |
234 | ea2384d3 | bellard | int i;
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235 | ea2384d3 | bellard | |
236 | ea2384d3 | bellard | for(i = 0; i < nb_sectors; i++) { |
237 | ea2384d3 | bellard | ivec.ll[0] = cpu_to_le64(sector_num);
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238 | ea2384d3 | bellard | ivec.ll[1] = 0; |
239 | ea2384d3 | bellard | AES_cbc_encrypt(in_buf, out_buf, 512, key,
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240 | ea2384d3 | bellard | ivec.b, enc); |
241 | ea2384d3 | bellard | sector_num++; |
242 | ea2384d3 | bellard | in_buf += 512;
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243 | ea2384d3 | bellard | out_buf += 512;
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244 | ea2384d3 | bellard | } |
245 | ea2384d3 | bellard | } |
246 | ea2384d3 | bellard | |
247 | ea2384d3 | bellard | /* 'allocate' is:
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248 | ea2384d3 | bellard | *
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249 | ea2384d3 | bellard | * 0 to not allocate.
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250 | ea2384d3 | bellard | *
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251 | ea2384d3 | bellard | * 1 to allocate a normal cluster (for sector indexes 'n_start' to
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252 | ea2384d3 | bellard | * 'n_end')
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253 | ea2384d3 | bellard | *
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254 | ea2384d3 | bellard | * 2 to allocate a compressed cluster of size
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255 | ea2384d3 | bellard | * 'compressed_size'. 'compressed_size' must be > 0 and <
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256 | ea2384d3 | bellard | * cluster_size
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257 | ea2384d3 | bellard | *
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258 | ea2384d3 | bellard | * return 0 if not allocated.
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259 | ea2384d3 | bellard | */
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260 | ea2384d3 | bellard | static uint64_t get_cluster_offset(BlockDriverState *bs,
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261 | ea2384d3 | bellard | uint64_t offset, int allocate,
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262 | ea2384d3 | bellard | int compressed_size,
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263 | ea2384d3 | bellard | int n_start, int n_end) |
264 | ea2384d3 | bellard | { |
265 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
266 | ea2384d3 | bellard | int min_index, i, j, l1_index, l2_index;
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267 | ea2384d3 | bellard | uint64_t l2_offset, *l2_table, cluster_offset, tmp; |
268 | ea2384d3 | bellard | uint32_t min_count; |
269 | ea2384d3 | bellard | int new_l2_table;
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270 | ea2384d3 | bellard | |
271 | ea2384d3 | bellard | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
272 | ea2384d3 | bellard | l2_offset = s->l1_table[l1_index]; |
273 | ea2384d3 | bellard | new_l2_table = 0;
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274 | ea2384d3 | bellard | if (!l2_offset) {
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275 | ea2384d3 | bellard | if (!allocate)
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276 | ea2384d3 | bellard | return 0; |
277 | ea2384d3 | bellard | /* allocate a new l2 entry */
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278 | d5249393 | bellard | l2_offset = lseek(s->fd, 0, SEEK_END);
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279 | ea2384d3 | bellard | /* round to cluster size */
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280 | ea2384d3 | bellard | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); |
281 | ea2384d3 | bellard | /* update the L1 entry */
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282 | ea2384d3 | bellard | s->l1_table[l1_index] = l2_offset; |
283 | ea2384d3 | bellard | tmp = cpu_to_be64(l2_offset); |
284 | d5249393 | bellard | lseek(s->fd, s->l1_table_offset + l1_index * sizeof(tmp), SEEK_SET);
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285 | ea2384d3 | bellard | if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp)) |
286 | ea2384d3 | bellard | return 0; |
287 | ea2384d3 | bellard | new_l2_table = 1;
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288 | ea2384d3 | bellard | } |
289 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
290 | ea2384d3 | bellard | if (l2_offset == s->l2_cache_offsets[i]) {
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291 | ea2384d3 | bellard | /* increment the hit count */
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292 | ea2384d3 | bellard | if (++s->l2_cache_counts[i] == 0xffffffff) { |
293 | ea2384d3 | bellard | for(j = 0; j < L2_CACHE_SIZE; j++) { |
294 | ea2384d3 | bellard | s->l2_cache_counts[j] >>= 1;
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295 | ea2384d3 | bellard | } |
296 | ea2384d3 | bellard | } |
297 | ea2384d3 | bellard | l2_table = s->l2_cache + (i << s->l2_bits); |
298 | ea2384d3 | bellard | goto found;
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299 | ea2384d3 | bellard | } |
300 | ea2384d3 | bellard | } |
301 | ea2384d3 | bellard | /* not found: load a new entry in the least used one */
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302 | ea2384d3 | bellard | min_index = 0;
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303 | ea2384d3 | bellard | min_count = 0xffffffff;
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304 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
305 | ea2384d3 | bellard | if (s->l2_cache_counts[i] < min_count) {
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306 | ea2384d3 | bellard | min_count = s->l2_cache_counts[i]; |
307 | ea2384d3 | bellard | min_index = i; |
308 | ea2384d3 | bellard | } |
309 | ea2384d3 | bellard | } |
310 | ea2384d3 | bellard | l2_table = s->l2_cache + (min_index << s->l2_bits); |
311 | ea2384d3 | bellard | lseek(s->fd, l2_offset, SEEK_SET); |
312 | ea2384d3 | bellard | if (new_l2_table) {
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313 | ea2384d3 | bellard | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
314 | ea2384d3 | bellard | if (write(s->fd, l2_table, s->l2_size * sizeof(uint64_t)) != |
315 | ea2384d3 | bellard | s->l2_size * sizeof(uint64_t))
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316 | ea2384d3 | bellard | return 0; |
317 | ea2384d3 | bellard | } else {
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318 | ea2384d3 | bellard | if (read(s->fd, l2_table, s->l2_size * sizeof(uint64_t)) != |
319 | ea2384d3 | bellard | s->l2_size * sizeof(uint64_t))
|
320 | ea2384d3 | bellard | return 0; |
321 | ea2384d3 | bellard | } |
322 | ea2384d3 | bellard | s->l2_cache_offsets[min_index] = l2_offset; |
323 | ea2384d3 | bellard | s->l2_cache_counts[min_index] = 1;
|
324 | ea2384d3 | bellard | found:
|
325 | ea2384d3 | bellard | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
|
326 | ea2384d3 | bellard | cluster_offset = be64_to_cpu(l2_table[l2_index]); |
327 | ea2384d3 | bellard | if (!cluster_offset ||
|
328 | ea2384d3 | bellard | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
|
329 | ea2384d3 | bellard | if (!allocate)
|
330 | ea2384d3 | bellard | return 0; |
331 | ea2384d3 | bellard | /* allocate a new cluster */
|
332 | ea2384d3 | bellard | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) &&
|
333 | ea2384d3 | bellard | (n_end - n_start) < s->cluster_sectors) { |
334 | ea2384d3 | bellard | /* if the cluster is already compressed, we must
|
335 | ea2384d3 | bellard | decompress it in the case it is not completely
|
336 | ea2384d3 | bellard | overwritten */
|
337 | ea2384d3 | bellard | if (decompress_cluster(s, cluster_offset) < 0) |
338 | ea2384d3 | bellard | return 0; |
339 | d5249393 | bellard | cluster_offset = lseek(s->fd, 0, SEEK_END);
|
340 | ea2384d3 | bellard | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
341 | ea2384d3 | bellard | ~(s->cluster_size - 1);
|
342 | ea2384d3 | bellard | /* write the cluster content */
|
343 | d5249393 | bellard | lseek(s->fd, cluster_offset, SEEK_SET); |
344 | ea2384d3 | bellard | if (write(s->fd, s->cluster_cache, s->cluster_size) !=
|
345 | ea2384d3 | bellard | s->cluster_size) |
346 | ea2384d3 | bellard | return -1; |
347 | ea2384d3 | bellard | } else {
|
348 | d5249393 | bellard | cluster_offset = lseek(s->fd, 0, SEEK_END);
|
349 | ea2384d3 | bellard | if (allocate == 1) { |
350 | ea2384d3 | bellard | /* round to cluster size */
|
351 | ea2384d3 | bellard | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
352 | ea2384d3 | bellard | ~(s->cluster_size - 1);
|
353 | ea2384d3 | bellard | ftruncate(s->fd, cluster_offset + s->cluster_size); |
354 | ea2384d3 | bellard | /* if encrypted, we must initialize the cluster
|
355 | ea2384d3 | bellard | content which won't be written */
|
356 | ea2384d3 | bellard | if (s->crypt_method &&
|
357 | ea2384d3 | bellard | (n_end - n_start) < s->cluster_sectors) { |
358 | ea2384d3 | bellard | uint64_t start_sect; |
359 | ea2384d3 | bellard | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; |
360 | ea2384d3 | bellard | memset(s->cluster_data + 512, 0xaa, 512); |
361 | ea2384d3 | bellard | for(i = 0; i < s->cluster_sectors; i++) { |
362 | ea2384d3 | bellard | if (i < n_start || i >= n_end) {
|
363 | ea2384d3 | bellard | encrypt_sectors(s, start_sect + i, |
364 | ea2384d3 | bellard | s->cluster_data, |
365 | ea2384d3 | bellard | s->cluster_data + 512, 1, 1, |
366 | ea2384d3 | bellard | &s->aes_encrypt_key); |
367 | d5249393 | bellard | lseek(s->fd, cluster_offset + i * 512, SEEK_SET);
|
368 | ea2384d3 | bellard | if (write(s->fd, s->cluster_data, 512) != 512) |
369 | ea2384d3 | bellard | return -1; |
370 | ea2384d3 | bellard | } |
371 | ea2384d3 | bellard | } |
372 | ea2384d3 | bellard | } |
373 | ea2384d3 | bellard | } else {
|
374 | ea2384d3 | bellard | cluster_offset |= QCOW_OFLAG_COMPRESSED | |
375 | ea2384d3 | bellard | (uint64_t)compressed_size << (63 - s->cluster_bits);
|
376 | ea2384d3 | bellard | } |
377 | ea2384d3 | bellard | } |
378 | ea2384d3 | bellard | /* update L2 table */
|
379 | ea2384d3 | bellard | tmp = cpu_to_be64(cluster_offset); |
380 | ea2384d3 | bellard | l2_table[l2_index] = tmp; |
381 | d5249393 | bellard | lseek(s->fd, l2_offset + l2_index * sizeof(tmp), SEEK_SET);
|
382 | ea2384d3 | bellard | if (write(s->fd, &tmp, sizeof(tmp)) != sizeof(tmp)) |
383 | ea2384d3 | bellard | return 0; |
384 | ea2384d3 | bellard | } |
385 | ea2384d3 | bellard | return cluster_offset;
|
386 | ea2384d3 | bellard | } |
387 | ea2384d3 | bellard | |
388 | ea2384d3 | bellard | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
389 | ea2384d3 | bellard | int nb_sectors, int *pnum) |
390 | ea2384d3 | bellard | { |
391 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
392 | ea2384d3 | bellard | int index_in_cluster, n;
|
393 | ea2384d3 | bellard | uint64_t cluster_offset; |
394 | ea2384d3 | bellard | |
395 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
396 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
397 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster; |
398 | ea2384d3 | bellard | if (n > nb_sectors)
|
399 | ea2384d3 | bellard | n = nb_sectors; |
400 | ea2384d3 | bellard | *pnum = n; |
401 | ea2384d3 | bellard | return (cluster_offset != 0); |
402 | ea2384d3 | bellard | } |
403 | ea2384d3 | bellard | |
404 | ea2384d3 | bellard | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, |
405 | ea2384d3 | bellard | const uint8_t *buf, int buf_size) |
406 | ea2384d3 | bellard | { |
407 | ea2384d3 | bellard | z_stream strm1, *strm = &strm1; |
408 | ea2384d3 | bellard | int ret, out_len;
|
409 | ea2384d3 | bellard | |
410 | ea2384d3 | bellard | memset(strm, 0, sizeof(*strm)); |
411 | ea2384d3 | bellard | |
412 | ea2384d3 | bellard | strm->next_in = (uint8_t *)buf; |
413 | ea2384d3 | bellard | strm->avail_in = buf_size; |
414 | ea2384d3 | bellard | strm->next_out = out_buf; |
415 | ea2384d3 | bellard | strm->avail_out = out_buf_size; |
416 | ea2384d3 | bellard | |
417 | ea2384d3 | bellard | ret = inflateInit2(strm, -12);
|
418 | ea2384d3 | bellard | if (ret != Z_OK)
|
419 | ea2384d3 | bellard | return -1; |
420 | ea2384d3 | bellard | ret = inflate(strm, Z_FINISH); |
421 | ea2384d3 | bellard | out_len = strm->next_out - out_buf; |
422 | ea2384d3 | bellard | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) ||
|
423 | ea2384d3 | bellard | out_len != out_buf_size) { |
424 | ea2384d3 | bellard | inflateEnd(strm); |
425 | ea2384d3 | bellard | return -1; |
426 | ea2384d3 | bellard | } |
427 | ea2384d3 | bellard | inflateEnd(strm); |
428 | ea2384d3 | bellard | return 0; |
429 | ea2384d3 | bellard | } |
430 | ea2384d3 | bellard | |
431 | ea2384d3 | bellard | static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset) |
432 | ea2384d3 | bellard | { |
433 | ea2384d3 | bellard | int ret, csize;
|
434 | ea2384d3 | bellard | uint64_t coffset; |
435 | ea2384d3 | bellard | |
436 | ea2384d3 | bellard | coffset = cluster_offset & s->cluster_offset_mask; |
437 | ea2384d3 | bellard | if (s->cluster_cache_offset != coffset) {
|
438 | ea2384d3 | bellard | csize = cluster_offset >> (63 - s->cluster_bits);
|
439 | ea2384d3 | bellard | csize &= (s->cluster_size - 1);
|
440 | d5249393 | bellard | lseek(s->fd, coffset, SEEK_SET); |
441 | ea2384d3 | bellard | ret = read(s->fd, s->cluster_data, csize); |
442 | ea2384d3 | bellard | if (ret != csize)
|
443 | ea2384d3 | bellard | return -1; |
444 | ea2384d3 | bellard | if (decompress_buffer(s->cluster_cache, s->cluster_size,
|
445 | ea2384d3 | bellard | s->cluster_data, csize) < 0) {
|
446 | ea2384d3 | bellard | return -1; |
447 | ea2384d3 | bellard | } |
448 | ea2384d3 | bellard | s->cluster_cache_offset = coffset; |
449 | ea2384d3 | bellard | } |
450 | ea2384d3 | bellard | return 0; |
451 | ea2384d3 | bellard | } |
452 | ea2384d3 | bellard | |
453 | ea2384d3 | bellard | static int qcow_read(BlockDriverState *bs, int64_t sector_num, |
454 | ea2384d3 | bellard | uint8_t *buf, int nb_sectors)
|
455 | ea2384d3 | bellard | { |
456 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
457 | ea2384d3 | bellard | int ret, index_in_cluster, n;
|
458 | ea2384d3 | bellard | uint64_t cluster_offset; |
459 | ea2384d3 | bellard | |
460 | ea2384d3 | bellard | while (nb_sectors > 0) { |
461 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
462 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
463 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster; |
464 | ea2384d3 | bellard | if (n > nb_sectors)
|
465 | ea2384d3 | bellard | n = nb_sectors; |
466 | ea2384d3 | bellard | if (!cluster_offset) {
|
467 | ea2384d3 | bellard | memset(buf, 0, 512 * n); |
468 | ea2384d3 | bellard | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
469 | ea2384d3 | bellard | if (decompress_cluster(s, cluster_offset) < 0) |
470 | ea2384d3 | bellard | return -1; |
471 | ea2384d3 | bellard | memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n); |
472 | ea2384d3 | bellard | } else {
|
473 | d5249393 | bellard | lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
|
474 | ea2384d3 | bellard | ret = read(s->fd, buf, n * 512);
|
475 | ea2384d3 | bellard | if (ret != n * 512) |
476 | ea2384d3 | bellard | return -1; |
477 | ea2384d3 | bellard | if (s->crypt_method) {
|
478 | ea2384d3 | bellard | encrypt_sectors(s, sector_num, buf, buf, n, 0,
|
479 | ea2384d3 | bellard | &s->aes_decrypt_key); |
480 | ea2384d3 | bellard | } |
481 | ea2384d3 | bellard | } |
482 | ea2384d3 | bellard | nb_sectors -= n; |
483 | ea2384d3 | bellard | sector_num += n; |
484 | ea2384d3 | bellard | buf += n * 512;
|
485 | ea2384d3 | bellard | } |
486 | ea2384d3 | bellard | return 0; |
487 | ea2384d3 | bellard | } |
488 | ea2384d3 | bellard | |
489 | ea2384d3 | bellard | static int qcow_write(BlockDriverState *bs, int64_t sector_num, |
490 | ea2384d3 | bellard | const uint8_t *buf, int nb_sectors) |
491 | ea2384d3 | bellard | { |
492 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
493 | ea2384d3 | bellard | int ret, index_in_cluster, n;
|
494 | ea2384d3 | bellard | uint64_t cluster_offset; |
495 | ea2384d3 | bellard | |
496 | ea2384d3 | bellard | while (nb_sectors > 0) { |
497 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
498 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster; |
499 | ea2384d3 | bellard | if (n > nb_sectors)
|
500 | ea2384d3 | bellard | n = nb_sectors; |
501 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0, |
502 | ea2384d3 | bellard | index_in_cluster, |
503 | ea2384d3 | bellard | index_in_cluster + n); |
504 | ea2384d3 | bellard | if (!cluster_offset)
|
505 | ea2384d3 | bellard | return -1; |
506 | d5249393 | bellard | lseek(s->fd, cluster_offset + index_in_cluster * 512, SEEK_SET);
|
507 | ea2384d3 | bellard | if (s->crypt_method) {
|
508 | ea2384d3 | bellard | encrypt_sectors(s, sector_num, s->cluster_data, buf, n, 1,
|
509 | ea2384d3 | bellard | &s->aes_encrypt_key); |
510 | ea2384d3 | bellard | ret = write(s->fd, s->cluster_data, n * 512);
|
511 | ea2384d3 | bellard | } else {
|
512 | ea2384d3 | bellard | ret = write(s->fd, buf, n * 512);
|
513 | ea2384d3 | bellard | } |
514 | ea2384d3 | bellard | if (ret != n * 512) |
515 | ea2384d3 | bellard | return -1; |
516 | ea2384d3 | bellard | nb_sectors -= n; |
517 | ea2384d3 | bellard | sector_num += n; |
518 | ea2384d3 | bellard | buf += n * 512;
|
519 | ea2384d3 | bellard | } |
520 | ea2384d3 | bellard | s->cluster_cache_offset = -1; /* disable compressed cache */ |
521 | ea2384d3 | bellard | return 0; |
522 | ea2384d3 | bellard | } |
523 | ea2384d3 | bellard | |
524 | e2731add | bellard | static void qcow_close(BlockDriverState *bs) |
525 | ea2384d3 | bellard | { |
526 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
527 | ea2384d3 | bellard | qemu_free(s->l1_table); |
528 | ea2384d3 | bellard | qemu_free(s->l2_cache); |
529 | ea2384d3 | bellard | qemu_free(s->cluster_cache); |
530 | ea2384d3 | bellard | qemu_free(s->cluster_data); |
531 | ea2384d3 | bellard | close(s->fd); |
532 | ea2384d3 | bellard | } |
533 | ea2384d3 | bellard | |
534 | ea2384d3 | bellard | static int qcow_create(const char *filename, int64_t total_size, |
535 | ea2384d3 | bellard | const char *backing_file, int flags) |
536 | ea2384d3 | bellard | { |
537 | ea2384d3 | bellard | int fd, header_size, backing_filename_len, l1_size, i, shift;
|
538 | ea2384d3 | bellard | QCowHeader header; |
539 | ea2384d3 | bellard | char backing_filename[1024]; |
540 | ea2384d3 | bellard | uint64_t tmp; |
541 | ea2384d3 | bellard | struct stat st;
|
542 | ea2384d3 | bellard | |
543 | ea2384d3 | bellard | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
544 | ea2384d3 | bellard | 0644);
|
545 | ea2384d3 | bellard | if (fd < 0) |
546 | ea2384d3 | bellard | return -1; |
547 | ea2384d3 | bellard | memset(&header, 0, sizeof(header)); |
548 | ea2384d3 | bellard | header.magic = cpu_to_be32(QCOW_MAGIC); |
549 | ea2384d3 | bellard | header.version = cpu_to_be32(QCOW_VERSION); |
550 | ea2384d3 | bellard | header.size = cpu_to_be64(total_size * 512);
|
551 | ea2384d3 | bellard | header_size = sizeof(header);
|
552 | ea2384d3 | bellard | backing_filename_len = 0;
|
553 | ea2384d3 | bellard | if (backing_file) {
|
554 | ea2384d3 | bellard | realpath(backing_file, backing_filename); |
555 | ea2384d3 | bellard | if (stat(backing_filename, &st) != 0) { |
556 | ea2384d3 | bellard | return -1; |
557 | ea2384d3 | bellard | } |
558 | ea2384d3 | bellard | header.mtime = cpu_to_be32(st.st_mtime); |
559 | ea2384d3 | bellard | header.backing_file_offset = cpu_to_be64(header_size); |
560 | ea2384d3 | bellard | backing_filename_len = strlen(backing_filename); |
561 | ea2384d3 | bellard | header.backing_file_size = cpu_to_be32(backing_filename_len); |
562 | ea2384d3 | bellard | header_size += backing_filename_len; |
563 | ea2384d3 | bellard | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
564 | ea2384d3 | bellard | unmodifyed sectors */
|
565 | ea2384d3 | bellard | header.l2_bits = 12; /* 32 KB L2 tables */ |
566 | ea2384d3 | bellard | } else {
|
567 | ea2384d3 | bellard | header.cluster_bits = 12; /* 4 KB clusters */ |
568 | ea2384d3 | bellard | header.l2_bits = 9; /* 4 KB L2 tables */ |
569 | ea2384d3 | bellard | } |
570 | ea2384d3 | bellard | header_size = (header_size + 7) & ~7; |
571 | ea2384d3 | bellard | shift = header.cluster_bits + header.l2_bits; |
572 | ea2384d3 | bellard | l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift; |
573 | ea2384d3 | bellard | |
574 | ea2384d3 | bellard | header.l1_table_offset = cpu_to_be64(header_size); |
575 | ea2384d3 | bellard | if (flags) {
|
576 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
577 | ea2384d3 | bellard | } else {
|
578 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
579 | ea2384d3 | bellard | } |
580 | ea2384d3 | bellard | |
581 | ea2384d3 | bellard | /* write all the data */
|
582 | ea2384d3 | bellard | write(fd, &header, sizeof(header));
|
583 | ea2384d3 | bellard | if (backing_file) {
|
584 | ea2384d3 | bellard | write(fd, backing_filename, backing_filename_len); |
585 | ea2384d3 | bellard | } |
586 | ea2384d3 | bellard | lseek(fd, header_size, SEEK_SET); |
587 | ea2384d3 | bellard | tmp = 0;
|
588 | ea2384d3 | bellard | for(i = 0;i < l1_size; i++) { |
589 | ea2384d3 | bellard | write(fd, &tmp, sizeof(tmp));
|
590 | ea2384d3 | bellard | } |
591 | ea2384d3 | bellard | close(fd); |
592 | ea2384d3 | bellard | return 0; |
593 | ea2384d3 | bellard | } |
594 | ea2384d3 | bellard | |
595 | ea2384d3 | bellard | int qcow_get_cluster_size(BlockDriverState *bs)
|
596 | ea2384d3 | bellard | { |
597 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
598 | ea2384d3 | bellard | if (bs->drv != &bdrv_qcow)
|
599 | ea2384d3 | bellard | return -1; |
600 | ea2384d3 | bellard | return s->cluster_size;
|
601 | ea2384d3 | bellard | } |
602 | ea2384d3 | bellard | |
603 | ea2384d3 | bellard | /* XXX: put compressed sectors first, then all the cluster aligned
|
604 | ea2384d3 | bellard | tables to avoid losing bytes in alignment */
|
605 | ea2384d3 | bellard | int qcow_compress_cluster(BlockDriverState *bs, int64_t sector_num,
|
606 | ea2384d3 | bellard | const uint8_t *buf)
|
607 | ea2384d3 | bellard | { |
608 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
609 | ea2384d3 | bellard | z_stream strm; |
610 | ea2384d3 | bellard | int ret, out_len;
|
611 | ea2384d3 | bellard | uint8_t *out_buf; |
612 | ea2384d3 | bellard | uint64_t cluster_offset; |
613 | ea2384d3 | bellard | |
614 | ea2384d3 | bellard | if (bs->drv != &bdrv_qcow)
|
615 | ea2384d3 | bellard | return -1; |
616 | ea2384d3 | bellard | |
617 | ea2384d3 | bellard | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
618 | ea2384d3 | bellard | if (!out_buf)
|
619 | ea2384d3 | bellard | return -1; |
620 | ea2384d3 | bellard | |
621 | ea2384d3 | bellard | /* best compression, small window, no zlib header */
|
622 | ea2384d3 | bellard | memset(&strm, 0, sizeof(strm)); |
623 | ea2384d3 | bellard | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
624 | ea2384d3 | bellard | Z_DEFLATED, -12,
|
625 | ea2384d3 | bellard | 9, Z_DEFAULT_STRATEGY);
|
626 | ea2384d3 | bellard | if (ret != 0) { |
627 | ea2384d3 | bellard | qemu_free(out_buf); |
628 | ea2384d3 | bellard | return -1; |
629 | ea2384d3 | bellard | } |
630 | ea2384d3 | bellard | |
631 | ea2384d3 | bellard | strm.avail_in = s->cluster_size; |
632 | ea2384d3 | bellard | strm.next_in = (uint8_t *)buf; |
633 | ea2384d3 | bellard | strm.avail_out = s->cluster_size; |
634 | ea2384d3 | bellard | strm.next_out = out_buf; |
635 | ea2384d3 | bellard | |
636 | ea2384d3 | bellard | ret = deflate(&strm, Z_FINISH); |
637 | ea2384d3 | bellard | if (ret != Z_STREAM_END && ret != Z_OK) {
|
638 | ea2384d3 | bellard | qemu_free(out_buf); |
639 | ea2384d3 | bellard | deflateEnd(&strm); |
640 | ea2384d3 | bellard | return -1; |
641 | ea2384d3 | bellard | } |
642 | ea2384d3 | bellard | out_len = strm.next_out - out_buf; |
643 | ea2384d3 | bellard | |
644 | ea2384d3 | bellard | deflateEnd(&strm); |
645 | ea2384d3 | bellard | |
646 | ea2384d3 | bellard | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
647 | ea2384d3 | bellard | /* could not compress: write normal cluster */
|
648 | ea2384d3 | bellard | qcow_write(bs, sector_num, buf, s->cluster_sectors); |
649 | ea2384d3 | bellard | } else {
|
650 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
651 | ea2384d3 | bellard | out_len, 0, 0); |
652 | ea2384d3 | bellard | cluster_offset &= s->cluster_offset_mask; |
653 | d5249393 | bellard | lseek(s->fd, cluster_offset, SEEK_SET); |
654 | ea2384d3 | bellard | if (write(s->fd, out_buf, out_len) != out_len) {
|
655 | ea2384d3 | bellard | qemu_free(out_buf); |
656 | ea2384d3 | bellard | return -1; |
657 | ea2384d3 | bellard | } |
658 | ea2384d3 | bellard | } |
659 | ea2384d3 | bellard | |
660 | ea2384d3 | bellard | qemu_free(out_buf); |
661 | ea2384d3 | bellard | return 0; |
662 | ea2384d3 | bellard | } |
663 | ea2384d3 | bellard | |
664 | ea2384d3 | bellard | BlockDriver bdrv_qcow = { |
665 | ea2384d3 | bellard | "qcow",
|
666 | ea2384d3 | bellard | sizeof(BDRVQcowState),
|
667 | ea2384d3 | bellard | qcow_probe, |
668 | ea2384d3 | bellard | qcow_open, |
669 | ea2384d3 | bellard | qcow_read, |
670 | ea2384d3 | bellard | qcow_write, |
671 | ea2384d3 | bellard | qcow_close, |
672 | ea2384d3 | bellard | qcow_create, |
673 | ea2384d3 | bellard | qcow_is_allocated, |
674 | ea2384d3 | bellard | qcow_set_key, |
675 | ea2384d3 | bellard | }; |
676 | ea2384d3 | bellard |