root / block / qcow.c @ 9c9efb6b
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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 | 5fafdf24 | ths | *
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4 | 83f64091 | bellard | * Copyright (c) 2004-2006 Fabrice Bellard
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5 | 5fafdf24 | ths | *
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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 | faf07963 | pbrook | #include "qemu-common.h" |
25 | ea2384d3 | bellard | #include "block_int.h" |
26 | 5efa9d5a | Anthony Liguori | #include "module.h" |
27 | 28d34b82 | bellard | #include <zlib.h> |
28 | ea2384d3 | bellard | #include "aes.h" |
29 | ea2384d3 | bellard | |
30 | ea2384d3 | bellard | /**************************************************************/
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31 | ea2384d3 | bellard | /* QEMU COW block driver with compression and encryption support */
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32 | ea2384d3 | bellard | |
33 | ea2384d3 | bellard | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
34 | ea2384d3 | bellard | #define QCOW_VERSION 1 |
35 | ea2384d3 | bellard | |
36 | ea2384d3 | bellard | #define QCOW_CRYPT_NONE 0 |
37 | ea2384d3 | bellard | #define QCOW_CRYPT_AES 1 |
38 | ea2384d3 | bellard | |
39 | ea2384d3 | bellard | #define QCOW_OFLAG_COMPRESSED (1LL << 63) |
40 | ea2384d3 | bellard | |
41 | ea2384d3 | bellard | typedef struct QCowHeader { |
42 | ea2384d3 | bellard | uint32_t magic; |
43 | ea2384d3 | bellard | uint32_t version; |
44 | ea2384d3 | bellard | uint64_t backing_file_offset; |
45 | ea2384d3 | bellard | uint32_t backing_file_size; |
46 | ea2384d3 | bellard | uint32_t mtime; |
47 | ea2384d3 | bellard | uint64_t size; /* in bytes */
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48 | ea2384d3 | bellard | uint8_t cluster_bits; |
49 | ea2384d3 | bellard | uint8_t l2_bits; |
50 | ea2384d3 | bellard | uint32_t crypt_method; |
51 | ea2384d3 | bellard | uint64_t l1_table_offset; |
52 | ea2384d3 | bellard | } QCowHeader; |
53 | ea2384d3 | bellard | |
54 | ea2384d3 | bellard | #define L2_CACHE_SIZE 16 |
55 | ea2384d3 | bellard | |
56 | ea2384d3 | bellard | typedef struct BDRVQcowState { |
57 | 83f64091 | bellard | BlockDriverState *hd; |
58 | ea2384d3 | bellard | int cluster_bits;
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59 | ea2384d3 | bellard | int cluster_size;
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60 | ea2384d3 | bellard | int cluster_sectors;
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61 | ea2384d3 | bellard | int l2_bits;
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62 | ea2384d3 | bellard | int l2_size;
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63 | ea2384d3 | bellard | int l1_size;
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64 | ea2384d3 | bellard | uint64_t cluster_offset_mask; |
65 | ea2384d3 | bellard | uint64_t l1_table_offset; |
66 | ea2384d3 | bellard | uint64_t *l1_table; |
67 | ea2384d3 | bellard | uint64_t *l2_cache; |
68 | ea2384d3 | bellard | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; |
69 | ea2384d3 | bellard | uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
70 | ea2384d3 | bellard | uint8_t *cluster_cache; |
71 | ea2384d3 | bellard | uint8_t *cluster_data; |
72 | ea2384d3 | bellard | uint64_t cluster_cache_offset; |
73 | ea2384d3 | bellard | uint32_t crypt_method; /* current crypt method, 0 if no key yet */
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74 | ea2384d3 | bellard | uint32_t crypt_method_header; |
75 | ea2384d3 | bellard | AES_KEY aes_encrypt_key; |
76 | ea2384d3 | bellard | AES_KEY aes_decrypt_key; |
77 | ea2384d3 | bellard | } BDRVQcowState; |
78 | ea2384d3 | bellard | |
79 | ea2384d3 | bellard | static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset); |
80 | ea2384d3 | bellard | |
81 | ea2384d3 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
82 | ea2384d3 | bellard | { |
83 | ea2384d3 | bellard | const QCowHeader *cow_header = (const void *)buf; |
84 | 3b46e624 | ths | |
85 | 712e7874 | bellard | if (buf_size >= sizeof(QCowHeader) && |
86 | 712e7874 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
87 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
88 | ea2384d3 | bellard | return 100; |
89 | ea2384d3 | bellard | else
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90 | ea2384d3 | bellard | return 0; |
91 | ea2384d3 | bellard | } |
92 | ea2384d3 | bellard | |
93 | 83f64091 | bellard | static int qcow_open(BlockDriverState *bs, const char *filename, int flags) |
94 | ea2384d3 | bellard | { |
95 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
96 | 83f64091 | bellard | int len, i, shift, ret;
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97 | ea2384d3 | bellard | QCowHeader header; |
98 | 83f64091 | bellard | |
99 | b5eff355 | aurel32 | ret = bdrv_file_open(&s->hd, filename, flags); |
100 | 83f64091 | bellard | if (ret < 0) |
101 | 83f64091 | bellard | return ret;
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102 | 83f64091 | bellard | if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header)) |
103 | ea2384d3 | bellard | goto fail;
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104 | ea2384d3 | bellard | be32_to_cpus(&header.magic); |
105 | ea2384d3 | bellard | be32_to_cpus(&header.version); |
106 | ea2384d3 | bellard | be64_to_cpus(&header.backing_file_offset); |
107 | ea2384d3 | bellard | be32_to_cpus(&header.backing_file_size); |
108 | ea2384d3 | bellard | be32_to_cpus(&header.mtime); |
109 | ea2384d3 | bellard | be64_to_cpus(&header.size); |
110 | ea2384d3 | bellard | be32_to_cpus(&header.crypt_method); |
111 | ea2384d3 | bellard | be64_to_cpus(&header.l1_table_offset); |
112 | 3b46e624 | ths | |
113 | ea2384d3 | bellard | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
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114 | ea2384d3 | bellard | goto fail;
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115 | ea2384d3 | bellard | if (header.size <= 1 || header.cluster_bits < 9) |
116 | ea2384d3 | bellard | goto fail;
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117 | ea2384d3 | bellard | if (header.crypt_method > QCOW_CRYPT_AES)
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118 | ea2384d3 | bellard | goto fail;
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119 | ea2384d3 | bellard | s->crypt_method_header = header.crypt_method; |
120 | ea2384d3 | bellard | if (s->crypt_method_header)
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121 | ea2384d3 | bellard | bs->encrypted = 1;
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122 | ea2384d3 | bellard | s->cluster_bits = header.cluster_bits; |
123 | ea2384d3 | bellard | s->cluster_size = 1 << s->cluster_bits;
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124 | ea2384d3 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
125 | ea2384d3 | bellard | s->l2_bits = header.l2_bits; |
126 | ea2384d3 | bellard | s->l2_size = 1 << s->l2_bits;
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127 | ea2384d3 | bellard | bs->total_sectors = header.size / 512;
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128 | ea2384d3 | bellard | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; |
129 | ea2384d3 | bellard | |
130 | ea2384d3 | bellard | /* read the level 1 table */
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131 | ea2384d3 | bellard | shift = s->cluster_bits + s->l2_bits; |
132 | ea2384d3 | bellard | s->l1_size = (header.size + (1LL << shift) - 1) >> shift; |
133 | ea2384d3 | bellard | |
134 | ea2384d3 | bellard | s->l1_table_offset = header.l1_table_offset; |
135 | ea2384d3 | bellard | s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
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136 | ea2384d3 | bellard | if (!s->l1_table)
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137 | ea2384d3 | bellard | goto fail;
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138 | 5fafdf24 | ths | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
139 | ea2384d3 | bellard | s->l1_size * sizeof(uint64_t))
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140 | ea2384d3 | bellard | goto fail;
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141 | ea2384d3 | bellard | for(i = 0;i < s->l1_size; i++) { |
142 | ea2384d3 | bellard | be64_to_cpus(&s->l1_table[i]); |
143 | ea2384d3 | bellard | } |
144 | ea2384d3 | bellard | /* alloc L2 cache */
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145 | ea2384d3 | bellard | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
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146 | ea2384d3 | bellard | if (!s->l2_cache)
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147 | ea2384d3 | bellard | goto fail;
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148 | ea2384d3 | bellard | s->cluster_cache = qemu_malloc(s->cluster_size); |
149 | ea2384d3 | bellard | if (!s->cluster_cache)
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150 | ea2384d3 | bellard | goto fail;
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151 | ea2384d3 | bellard | s->cluster_data = qemu_malloc(s->cluster_size); |
152 | ea2384d3 | bellard | if (!s->cluster_data)
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153 | ea2384d3 | bellard | goto fail;
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154 | ea2384d3 | bellard | s->cluster_cache_offset = -1;
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155 | 3b46e624 | ths | |
156 | ea2384d3 | bellard | /* read the backing file name */
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157 | ea2384d3 | bellard | if (header.backing_file_offset != 0) { |
158 | ea2384d3 | bellard | len = header.backing_file_size; |
159 | ea2384d3 | bellard | if (len > 1023) |
160 | ea2384d3 | bellard | len = 1023;
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161 | 83f64091 | bellard | if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len)
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162 | ea2384d3 | bellard | goto fail;
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163 | ea2384d3 | bellard | bs->backing_file[len] = '\0';
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164 | ea2384d3 | bellard | } |
165 | ea2384d3 | bellard | return 0; |
166 | ea2384d3 | bellard | |
167 | ea2384d3 | bellard | fail:
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168 | ea2384d3 | bellard | qemu_free(s->l1_table); |
169 | ea2384d3 | bellard | qemu_free(s->l2_cache); |
170 | ea2384d3 | bellard | qemu_free(s->cluster_cache); |
171 | ea2384d3 | bellard | qemu_free(s->cluster_data); |
172 | 83f64091 | bellard | bdrv_delete(s->hd); |
173 | ea2384d3 | bellard | return -1; |
174 | ea2384d3 | bellard | } |
175 | ea2384d3 | bellard | |
176 | ea2384d3 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
177 | ea2384d3 | bellard | { |
178 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
179 | ea2384d3 | bellard | uint8_t keybuf[16];
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180 | ea2384d3 | bellard | int len, i;
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181 | 3b46e624 | ths | |
182 | ea2384d3 | bellard | memset(keybuf, 0, 16); |
183 | ea2384d3 | bellard | len = strlen(key); |
184 | ea2384d3 | bellard | if (len > 16) |
185 | ea2384d3 | bellard | len = 16;
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186 | ea2384d3 | bellard | /* XXX: we could compress the chars to 7 bits to increase
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187 | ea2384d3 | bellard | entropy */
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188 | ea2384d3 | bellard | for(i = 0;i < len;i++) { |
189 | ea2384d3 | bellard | keybuf[i] = key[i]; |
190 | ea2384d3 | bellard | } |
191 | ea2384d3 | bellard | s->crypt_method = s->crypt_method_header; |
192 | ea2384d3 | bellard | |
193 | ea2384d3 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
194 | ea2384d3 | bellard | return -1; |
195 | ea2384d3 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
196 | ea2384d3 | bellard | return -1; |
197 | ea2384d3 | bellard | #if 0
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198 | ea2384d3 | bellard | /* test */
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199 | ea2384d3 | bellard | {
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200 | ea2384d3 | bellard | uint8_t in[16];
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201 | ea2384d3 | bellard | uint8_t out[16];
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202 | ea2384d3 | bellard | uint8_t tmp[16];
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203 | ea2384d3 | bellard | for(i=0;i<16;i++)
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204 | ea2384d3 | bellard | in[i] = i;
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205 | ea2384d3 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
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206 | ea2384d3 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
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207 | ea2384d3 | bellard | for(i = 0; i < 16; i++)
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208 | ea2384d3 | bellard | printf(" %02x", tmp[i]);
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209 | ea2384d3 | bellard | printf("\n");
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210 | ea2384d3 | bellard | for(i = 0; i < 16; i++)
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211 | ea2384d3 | bellard | printf(" %02x", out[i]);
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212 | ea2384d3 | bellard | printf("\n");
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213 | ea2384d3 | bellard | }
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214 | ea2384d3 | bellard | #endif
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215 | ea2384d3 | bellard | return 0; |
216 | ea2384d3 | bellard | } |
217 | ea2384d3 | bellard | |
218 | ea2384d3 | bellard | /* The crypt function is compatible with the linux cryptoloop
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219 | ea2384d3 | bellard | algorithm for < 4 GB images. NOTE: out_buf == in_buf is
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220 | ea2384d3 | bellard | supported */
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221 | ea2384d3 | bellard | static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num, |
222 | ea2384d3 | bellard | uint8_t *out_buf, const uint8_t *in_buf,
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223 | ea2384d3 | bellard | int nb_sectors, int enc, |
224 | ea2384d3 | bellard | const AES_KEY *key)
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225 | ea2384d3 | bellard | { |
226 | ea2384d3 | bellard | union {
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227 | ea2384d3 | bellard | uint64_t ll[2];
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228 | ea2384d3 | bellard | uint8_t b[16];
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229 | ea2384d3 | bellard | } ivec; |
230 | ea2384d3 | bellard | int i;
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231 | ea2384d3 | bellard | |
232 | ea2384d3 | bellard | for(i = 0; i < nb_sectors; i++) { |
233 | ea2384d3 | bellard | ivec.ll[0] = cpu_to_le64(sector_num);
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234 | ea2384d3 | bellard | ivec.ll[1] = 0; |
235 | 5fafdf24 | ths | AES_cbc_encrypt(in_buf, out_buf, 512, key,
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236 | ea2384d3 | bellard | ivec.b, enc); |
237 | ea2384d3 | bellard | sector_num++; |
238 | ea2384d3 | bellard | in_buf += 512;
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239 | ea2384d3 | bellard | out_buf += 512;
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240 | ea2384d3 | bellard | } |
241 | ea2384d3 | bellard | } |
242 | ea2384d3 | bellard | |
243 | ea2384d3 | bellard | /* 'allocate' is:
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244 | ea2384d3 | bellard | *
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245 | ea2384d3 | bellard | * 0 to not allocate.
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246 | ea2384d3 | bellard | *
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247 | ea2384d3 | bellard | * 1 to allocate a normal cluster (for sector indexes 'n_start' to
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248 | ea2384d3 | bellard | * 'n_end')
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249 | ea2384d3 | bellard | *
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250 | ea2384d3 | bellard | * 2 to allocate a compressed cluster of size
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251 | ea2384d3 | bellard | * 'compressed_size'. 'compressed_size' must be > 0 and <
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252 | 5fafdf24 | ths | * cluster_size
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253 | ea2384d3 | bellard | *
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254 | ea2384d3 | bellard | * return 0 if not allocated.
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255 | ea2384d3 | bellard | */
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256 | ea2384d3 | bellard | static uint64_t get_cluster_offset(BlockDriverState *bs,
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257 | ea2384d3 | bellard | uint64_t offset, int allocate,
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258 | ea2384d3 | bellard | int compressed_size,
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259 | ea2384d3 | bellard | int n_start, int n_end) |
260 | ea2384d3 | bellard | { |
261 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
262 | ea2384d3 | bellard | int min_index, i, j, l1_index, l2_index;
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263 | ea2384d3 | bellard | uint64_t l2_offset, *l2_table, cluster_offset, tmp; |
264 | ea2384d3 | bellard | uint32_t min_count; |
265 | ea2384d3 | bellard | int new_l2_table;
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266 | 3b46e624 | ths | |
267 | ea2384d3 | bellard | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
268 | ea2384d3 | bellard | l2_offset = s->l1_table[l1_index]; |
269 | ea2384d3 | bellard | new_l2_table = 0;
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270 | ea2384d3 | bellard | if (!l2_offset) {
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271 | ea2384d3 | bellard | if (!allocate)
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272 | ea2384d3 | bellard | return 0; |
273 | ea2384d3 | bellard | /* allocate a new l2 entry */
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274 | 83f64091 | bellard | l2_offset = bdrv_getlength(s->hd); |
275 | ea2384d3 | bellard | /* round to cluster size */
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276 | ea2384d3 | bellard | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); |
277 | ea2384d3 | bellard | /* update the L1 entry */
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278 | ea2384d3 | bellard | s->l1_table[l1_index] = l2_offset; |
279 | ea2384d3 | bellard | tmp = cpu_to_be64(l2_offset); |
280 | 5fafdf24 | ths | if (bdrv_pwrite(s->hd, s->l1_table_offset + l1_index * sizeof(tmp), |
281 | 83f64091 | bellard | &tmp, sizeof(tmp)) != sizeof(tmp)) |
282 | ea2384d3 | bellard | return 0; |
283 | ea2384d3 | bellard | new_l2_table = 1;
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284 | ea2384d3 | bellard | } |
285 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
286 | ea2384d3 | bellard | if (l2_offset == s->l2_cache_offsets[i]) {
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287 | ea2384d3 | bellard | /* increment the hit count */
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288 | ea2384d3 | bellard | if (++s->l2_cache_counts[i] == 0xffffffff) { |
289 | ea2384d3 | bellard | for(j = 0; j < L2_CACHE_SIZE; j++) { |
290 | ea2384d3 | bellard | s->l2_cache_counts[j] >>= 1;
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291 | ea2384d3 | bellard | } |
292 | ea2384d3 | bellard | } |
293 | ea2384d3 | bellard | l2_table = s->l2_cache + (i << s->l2_bits); |
294 | ea2384d3 | bellard | goto found;
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295 | ea2384d3 | bellard | } |
296 | ea2384d3 | bellard | } |
297 | ea2384d3 | bellard | /* not found: load a new entry in the least used one */
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298 | ea2384d3 | bellard | min_index = 0;
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299 | ea2384d3 | bellard | min_count = 0xffffffff;
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300 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
301 | ea2384d3 | bellard | if (s->l2_cache_counts[i] < min_count) {
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302 | ea2384d3 | bellard | min_count = s->l2_cache_counts[i]; |
303 | ea2384d3 | bellard | min_index = i; |
304 | ea2384d3 | bellard | } |
305 | ea2384d3 | bellard | } |
306 | ea2384d3 | bellard | l2_table = s->l2_cache + (min_index << s->l2_bits); |
307 | ea2384d3 | bellard | if (new_l2_table) {
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308 | ea2384d3 | bellard | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
309 | 83f64091 | bellard | if (bdrv_pwrite(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != |
310 | ea2384d3 | bellard | s->l2_size * sizeof(uint64_t))
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311 | ea2384d3 | bellard | return 0; |
312 | ea2384d3 | bellard | } else {
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313 | 5fafdf24 | ths | if (bdrv_pread(s->hd, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != |
314 | ea2384d3 | bellard | s->l2_size * sizeof(uint64_t))
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315 | ea2384d3 | bellard | return 0; |
316 | ea2384d3 | bellard | } |
317 | ea2384d3 | bellard | s->l2_cache_offsets[min_index] = l2_offset; |
318 | ea2384d3 | bellard | s->l2_cache_counts[min_index] = 1;
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319 | ea2384d3 | bellard | found:
|
320 | ea2384d3 | bellard | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
|
321 | ea2384d3 | bellard | cluster_offset = be64_to_cpu(l2_table[l2_index]); |
322 | 5fafdf24 | ths | if (!cluster_offset ||
|
323 | ea2384d3 | bellard | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
|
324 | ea2384d3 | bellard | if (!allocate)
|
325 | ea2384d3 | bellard | return 0; |
326 | ea2384d3 | bellard | /* allocate a new cluster */
|
327 | ea2384d3 | bellard | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) &&
|
328 | ea2384d3 | bellard | (n_end - n_start) < s->cluster_sectors) { |
329 | ea2384d3 | bellard | /* if the cluster is already compressed, we must
|
330 | ea2384d3 | bellard | decompress it in the case it is not completely
|
331 | ea2384d3 | bellard | overwritten */
|
332 | ea2384d3 | bellard | if (decompress_cluster(s, cluster_offset) < 0) |
333 | ea2384d3 | bellard | return 0; |
334 | 83f64091 | bellard | cluster_offset = bdrv_getlength(s->hd); |
335 | 5fafdf24 | ths | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
336 | ea2384d3 | bellard | ~(s->cluster_size - 1);
|
337 | ea2384d3 | bellard | /* write the cluster content */
|
338 | 5fafdf24 | ths | if (bdrv_pwrite(s->hd, cluster_offset, s->cluster_cache, s->cluster_size) !=
|
339 | ea2384d3 | bellard | s->cluster_size) |
340 | ea2384d3 | bellard | return -1; |
341 | ea2384d3 | bellard | } else {
|
342 | 83f64091 | bellard | cluster_offset = bdrv_getlength(s->hd); |
343 | 7f48fa1f | aliguori | if (allocate == 1) { |
344 | 7f48fa1f | aliguori | /* round to cluster size */
|
345 | 7f48fa1f | aliguori | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
346 | 7f48fa1f | aliguori | ~(s->cluster_size - 1);
|
347 | 7f48fa1f | aliguori | bdrv_truncate(s->hd, cluster_offset + s->cluster_size); |
348 | 7f48fa1f | aliguori | /* if encrypted, we must initialize the cluster
|
349 | 7f48fa1f | aliguori | content which won't be written */
|
350 | 7f48fa1f | aliguori | if (s->crypt_method &&
|
351 | 7f48fa1f | aliguori | (n_end - n_start) < s->cluster_sectors) { |
352 | 7f48fa1f | aliguori | uint64_t start_sect; |
353 | 7f48fa1f | aliguori | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; |
354 | 7f48fa1f | aliguori | memset(s->cluster_data + 512, 0x00, 512); |
355 | 7f48fa1f | aliguori | for(i = 0; i < s->cluster_sectors; i++) { |
356 | 7f48fa1f | aliguori | if (i < n_start || i >= n_end) {
|
357 | 7f48fa1f | aliguori | encrypt_sectors(s, start_sect + i, |
358 | 7f48fa1f | aliguori | s->cluster_data, |
359 | 7f48fa1f | aliguori | s->cluster_data + 512, 1, 1, |
360 | 7f48fa1f | aliguori | &s->aes_encrypt_key); |
361 | 7f48fa1f | aliguori | if (bdrv_pwrite(s->hd, cluster_offset + i * 512, |
362 | 7f48fa1f | aliguori | s->cluster_data, 512) != 512) |
363 | 7f48fa1f | aliguori | return -1; |
364 | 7f48fa1f | aliguori | } |
365 | ea2384d3 | bellard | } |
366 | ea2384d3 | bellard | } |
367 | 7f48fa1f | aliguori | } else if (allocate == 2) { |
368 | 7f48fa1f | aliguori | cluster_offset |= QCOW_OFLAG_COMPRESSED | |
369 | 7f48fa1f | aliguori | (uint64_t)compressed_size << (63 - s->cluster_bits);
|
370 | ea2384d3 | bellard | } |
371 | ea2384d3 | bellard | } |
372 | ea2384d3 | bellard | /* update L2 table */
|
373 | ea2384d3 | bellard | tmp = cpu_to_be64(cluster_offset); |
374 | ea2384d3 | bellard | l2_table[l2_index] = tmp; |
375 | 5fafdf24 | ths | if (bdrv_pwrite(s->hd,
|
376 | 83f64091 | bellard | l2_offset + l2_index * sizeof(tmp), &tmp, sizeof(tmp)) != sizeof(tmp)) |
377 | ea2384d3 | bellard | return 0; |
378 | ea2384d3 | bellard | } |
379 | ea2384d3 | bellard | return cluster_offset;
|
380 | ea2384d3 | bellard | } |
381 | ea2384d3 | bellard | |
382 | 5fafdf24 | ths | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
383 | ea2384d3 | bellard | int nb_sectors, int *pnum) |
384 | ea2384d3 | bellard | { |
385 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
386 | ea2384d3 | bellard | int index_in_cluster, n;
|
387 | ea2384d3 | bellard | uint64_t cluster_offset; |
388 | ea2384d3 | bellard | |
389 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
390 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
391 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster; |
392 | ea2384d3 | bellard | if (n > nb_sectors)
|
393 | ea2384d3 | bellard | n = nb_sectors; |
394 | ea2384d3 | bellard | *pnum = n; |
395 | ea2384d3 | bellard | return (cluster_offset != 0); |
396 | ea2384d3 | bellard | } |
397 | ea2384d3 | bellard | |
398 | ea2384d3 | bellard | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, |
399 | ea2384d3 | bellard | const uint8_t *buf, int buf_size) |
400 | ea2384d3 | bellard | { |
401 | ea2384d3 | bellard | z_stream strm1, *strm = &strm1; |
402 | ea2384d3 | bellard | int ret, out_len;
|
403 | ea2384d3 | bellard | |
404 | ea2384d3 | bellard | memset(strm, 0, sizeof(*strm)); |
405 | ea2384d3 | bellard | |
406 | ea2384d3 | bellard | strm->next_in = (uint8_t *)buf; |
407 | ea2384d3 | bellard | strm->avail_in = buf_size; |
408 | ea2384d3 | bellard | strm->next_out = out_buf; |
409 | ea2384d3 | bellard | strm->avail_out = out_buf_size; |
410 | ea2384d3 | bellard | |
411 | ea2384d3 | bellard | ret = inflateInit2(strm, -12);
|
412 | ea2384d3 | bellard | if (ret != Z_OK)
|
413 | ea2384d3 | bellard | return -1; |
414 | ea2384d3 | bellard | ret = inflate(strm, Z_FINISH); |
415 | ea2384d3 | bellard | out_len = strm->next_out - out_buf; |
416 | ea2384d3 | bellard | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) ||
|
417 | ea2384d3 | bellard | out_len != out_buf_size) { |
418 | ea2384d3 | bellard | inflateEnd(strm); |
419 | ea2384d3 | bellard | return -1; |
420 | ea2384d3 | bellard | } |
421 | ea2384d3 | bellard | inflateEnd(strm); |
422 | ea2384d3 | bellard | return 0; |
423 | ea2384d3 | bellard | } |
424 | 3b46e624 | ths | |
425 | ea2384d3 | bellard | static int decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset) |
426 | ea2384d3 | bellard | { |
427 | ea2384d3 | bellard | int ret, csize;
|
428 | ea2384d3 | bellard | uint64_t coffset; |
429 | ea2384d3 | bellard | |
430 | ea2384d3 | bellard | coffset = cluster_offset & s->cluster_offset_mask; |
431 | ea2384d3 | bellard | if (s->cluster_cache_offset != coffset) {
|
432 | ea2384d3 | bellard | csize = cluster_offset >> (63 - s->cluster_bits);
|
433 | ea2384d3 | bellard | csize &= (s->cluster_size - 1);
|
434 | 83f64091 | bellard | ret = bdrv_pread(s->hd, coffset, s->cluster_data, csize); |
435 | 5fafdf24 | ths | if (ret != csize)
|
436 | ea2384d3 | bellard | return -1; |
437 | ea2384d3 | bellard | if (decompress_buffer(s->cluster_cache, s->cluster_size,
|
438 | ea2384d3 | bellard | s->cluster_data, csize) < 0) {
|
439 | ea2384d3 | bellard | return -1; |
440 | ea2384d3 | bellard | } |
441 | ea2384d3 | bellard | s->cluster_cache_offset = coffset; |
442 | ea2384d3 | bellard | } |
443 | ea2384d3 | bellard | return 0; |
444 | ea2384d3 | bellard | } |
445 | ea2384d3 | bellard | |
446 | 83f64091 | bellard | #if 0
|
447 | 83f64091 | bellard | |
448 | 5fafdf24 | ths | static int qcow_read(BlockDriverState *bs, int64_t sector_num,
|
449 | ea2384d3 | bellard | uint8_t *buf, int nb_sectors)
|
450 | ea2384d3 | bellard | {
|
451 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque;
|
452 | ea2384d3 | bellard | int ret, index_in_cluster, n;
|
453 | ea2384d3 | bellard | uint64_t cluster_offset;
|
454 | 3b46e624 | ths | |
455 | ea2384d3 | bellard | while (nb_sectors > 0) {
|
456 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0);
|
457 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
458 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster;
|
459 | ea2384d3 | bellard | if (n > nb_sectors)
|
460 | ea2384d3 | bellard | n = nb_sectors;
|
461 | ea2384d3 | bellard | if (!cluster_offset) {
|
462 | 83f64091 | bellard | if (bs->backing_hd) {
|
463 | 83f64091 | bellard | /* read from the base image */
|
464 | 83f64091 | bellard | ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
|
465 | 83f64091 | bellard | if (ret < 0)
|
466 | 83f64091 | bellard | return -1;
|
467 | 83f64091 | bellard | } else {
|
468 | 83f64091 | bellard | memset(buf, 0, 512 * n);
|
469 | 83f64091 | bellard | }
|
470 | ea2384d3 | bellard | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
|
471 | ea2384d3 | bellard | if (decompress_cluster(s, cluster_offset) < 0)
|
472 | ea2384d3 | bellard | return -1;
|
473 | ea2384d3 | bellard | memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n);
|
474 | ea2384d3 | bellard | } else {
|
475 | 83f64091 | bellard | ret = bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512);
|
476 | 5fafdf24 | ths | if (ret != n * 512)
|
477 | ea2384d3 | bellard | return -1;
|
478 | ea2384d3 | bellard | if (s->crypt_method) {
|
479 | 5fafdf24 | ths | encrypt_sectors(s, sector_num, buf, buf, n, 0,
|
480 | ea2384d3 | bellard | &s->aes_decrypt_key);
|
481 | ea2384d3 | bellard | }
|
482 | ea2384d3 | bellard | }
|
483 | ea2384d3 | bellard | nb_sectors -= n;
|
484 | ea2384d3 | bellard | sector_num += n;
|
485 | ea2384d3 | bellard | buf += n * 512;
|
486 | ea2384d3 | bellard | }
|
487 | ea2384d3 | bellard | return 0;
|
488 | ea2384d3 | bellard | }
|
489 | 83f64091 | bellard | #endif
|
490 | ea2384d3 | bellard | |
491 | ce1a14dc | pbrook | typedef struct QCowAIOCB { |
492 | ce1a14dc | pbrook | BlockDriverAIOCB common; |
493 | 83f64091 | bellard | int64_t sector_num; |
494 | f141eafe | aliguori | QEMUIOVector *qiov; |
495 | 83f64091 | bellard | uint8_t *buf; |
496 | f141eafe | aliguori | void *orig_buf;
|
497 | 83f64091 | bellard | int nb_sectors;
|
498 | 83f64091 | bellard | int n;
|
499 | 83f64091 | bellard | uint64_t cluster_offset; |
500 | 5fafdf24 | ths | uint8_t *cluster_data; |
501 | c87c0672 | aliguori | struct iovec hd_iov;
|
502 | c87c0672 | aliguori | QEMUIOVector hd_qiov; |
503 | 83f64091 | bellard | BlockDriverAIOCB *hd_aiocb; |
504 | 83f64091 | bellard | } QCowAIOCB; |
505 | 83f64091 | bellard | |
506 | c16b5a2c | Christoph Hellwig | static void qcow_aio_cancel(BlockDriverAIOCB *blockacb) |
507 | c16b5a2c | Christoph Hellwig | { |
508 | c16b5a2c | Christoph Hellwig | QCowAIOCB *acb = (QCowAIOCB *)blockacb; |
509 | c16b5a2c | Christoph Hellwig | if (acb->hd_aiocb)
|
510 | c16b5a2c | Christoph Hellwig | bdrv_aio_cancel(acb->hd_aiocb); |
511 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
512 | c16b5a2c | Christoph Hellwig | } |
513 | c16b5a2c | Christoph Hellwig | |
514 | c16b5a2c | Christoph Hellwig | static AIOPool qcow_aio_pool = {
|
515 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(QCowAIOCB),
|
516 | c16b5a2c | Christoph Hellwig | .cancel = qcow_aio_cancel, |
517 | c16b5a2c | Christoph Hellwig | }; |
518 | ad53089b | Christoph Hellwig | |
519 | ad53089b | Christoph Hellwig | static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
|
520 | ad53089b | Christoph Hellwig | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
521 | ad53089b | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque, int is_write) |
522 | ad53089b | Christoph Hellwig | { |
523 | ad53089b | Christoph Hellwig | QCowAIOCB *acb; |
524 | ad53089b | Christoph Hellwig | |
525 | c16b5a2c | Christoph Hellwig | acb = qemu_aio_get(&qcow_aio_pool, bs, cb, opaque); |
526 | ad53089b | Christoph Hellwig | if (!acb)
|
527 | ad53089b | Christoph Hellwig | return NULL; |
528 | ad53089b | Christoph Hellwig | acb->hd_aiocb = NULL;
|
529 | ad53089b | Christoph Hellwig | acb->sector_num = sector_num; |
530 | ad53089b | Christoph Hellwig | acb->qiov = qiov; |
531 | ad53089b | Christoph Hellwig | if (qiov->niov > 1) { |
532 | ad53089b | Christoph Hellwig | acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size); |
533 | ad53089b | Christoph Hellwig | if (is_write)
|
534 | ad53089b | Christoph Hellwig | qemu_iovec_to_buffer(qiov, acb->buf); |
535 | ad53089b | Christoph Hellwig | } else {
|
536 | ad53089b | Christoph Hellwig | acb->buf = (uint8_t *)qiov->iov->iov_base; |
537 | ad53089b | Christoph Hellwig | } |
538 | ad53089b | Christoph Hellwig | acb->nb_sectors = nb_sectors; |
539 | ad53089b | Christoph Hellwig | acb->n = 0;
|
540 | ad53089b | Christoph Hellwig | acb->cluster_offset = 0;
|
541 | ad53089b | Christoph Hellwig | return acb;
|
542 | ad53089b | Christoph Hellwig | } |
543 | ad53089b | Christoph Hellwig | |
544 | 83f64091 | bellard | static void qcow_aio_read_cb(void *opaque, int ret) |
545 | 83f64091 | bellard | { |
546 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
547 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
548 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
549 | 83f64091 | bellard | int index_in_cluster;
|
550 | 83f64091 | bellard | |
551 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
552 | f141eafe | aliguori | if (ret < 0) |
553 | f141eafe | aliguori | goto done;
|
554 | 83f64091 | bellard | |
555 | 83f64091 | bellard | redo:
|
556 | 83f64091 | bellard | /* post process the read buffer */
|
557 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
558 | 83f64091 | bellard | /* nothing to do */
|
559 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
560 | 83f64091 | bellard | /* nothing to do */
|
561 | 83f64091 | bellard | } else {
|
562 | 83f64091 | bellard | if (s->crypt_method) {
|
563 | 5fafdf24 | ths | encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf, |
564 | 5fafdf24 | ths | acb->n, 0,
|
565 | 83f64091 | bellard | &s->aes_decrypt_key); |
566 | 83f64091 | bellard | } |
567 | 83f64091 | bellard | } |
568 | 83f64091 | bellard | |
569 | ce1a14dc | pbrook | acb->nb_sectors -= acb->n; |
570 | ce1a14dc | pbrook | acb->sector_num += acb->n; |
571 | ce1a14dc | pbrook | acb->buf += acb->n * 512;
|
572 | 83f64091 | bellard | |
573 | ce1a14dc | pbrook | if (acb->nb_sectors == 0) { |
574 | 83f64091 | bellard | /* request completed */
|
575 | f141eafe | aliguori | ret = 0;
|
576 | f141eafe | aliguori | goto done;
|
577 | 83f64091 | bellard | } |
578 | 3b46e624 | ths | |
579 | 83f64091 | bellard | /* prepare next AIO request */
|
580 | 5fafdf24 | ths | acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9,
|
581 | ce1a14dc | pbrook | 0, 0, 0, 0); |
582 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
583 | ce1a14dc | pbrook | acb->n = s->cluster_sectors - index_in_cluster; |
584 | ce1a14dc | pbrook | if (acb->n > acb->nb_sectors)
|
585 | ce1a14dc | pbrook | acb->n = acb->nb_sectors; |
586 | ce1a14dc | pbrook | |
587 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
588 | 83f64091 | bellard | if (bs->backing_hd) {
|
589 | 83f64091 | bellard | /* read from the base image */
|
590 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
591 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
592 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
593 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, |
594 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb); |
595 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
596 | f141eafe | aliguori | goto done;
|
597 | 83f64091 | bellard | } else {
|
598 | 83f64091 | bellard | /* Note: in this case, no need to wait */
|
599 | ce1a14dc | pbrook | memset(acb->buf, 0, 512 * acb->n); |
600 | 83f64091 | bellard | goto redo;
|
601 | 83f64091 | bellard | } |
602 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
603 | 83f64091 | bellard | /* add AIO support for compressed blocks ? */
|
604 | ce1a14dc | pbrook | if (decompress_cluster(s, acb->cluster_offset) < 0) |
605 | f141eafe | aliguori | goto done;
|
606 | 5fafdf24 | ths | memcpy(acb->buf, |
607 | ce1a14dc | pbrook | s->cluster_cache + index_in_cluster * 512, 512 * acb->n); |
608 | 83f64091 | bellard | goto redo;
|
609 | 83f64091 | bellard | } else {
|
610 | ce1a14dc | pbrook | if ((acb->cluster_offset & 511) != 0) { |
611 | 83f64091 | bellard | ret = -EIO; |
612 | f141eafe | aliguori | goto done;
|
613 | 83f64091 | bellard | } |
614 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
615 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
616 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
617 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(s->hd, |
618 | 5fafdf24 | ths | (acb->cluster_offset >> 9) + index_in_cluster,
|
619 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb); |
620 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
621 | f141eafe | aliguori | goto done;
|
622 | f141eafe | aliguori | } |
623 | f141eafe | aliguori | |
624 | f141eafe | aliguori | return;
|
625 | f141eafe | aliguori | |
626 | f141eafe | aliguori | done:
|
627 | f141eafe | aliguori | if (acb->qiov->niov > 1) { |
628 | f141eafe | aliguori | qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); |
629 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
630 | 83f64091 | bellard | } |
631 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
632 | f141eafe | aliguori | qemu_aio_release(acb); |
633 | 83f64091 | bellard | } |
634 | 83f64091 | bellard | |
635 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
|
636 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
637 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
638 | 83f64091 | bellard | { |
639 | ce1a14dc | pbrook | QCowAIOCB *acb; |
640 | ce1a14dc | pbrook | |
641 | ad53089b | Christoph Hellwig | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
642 | ce1a14dc | pbrook | if (!acb)
|
643 | ce1a14dc | pbrook | return NULL; |
644 | 83f64091 | bellard | |
645 | 83f64091 | bellard | qcow_aio_read_cb(acb, 0);
|
646 | ce1a14dc | pbrook | return &acb->common;
|
647 | 83f64091 | bellard | } |
648 | 83f64091 | bellard | |
649 | 83f64091 | bellard | static void qcow_aio_write_cb(void *opaque, int ret) |
650 | 83f64091 | bellard | { |
651 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
652 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
653 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
654 | 83f64091 | bellard | int index_in_cluster;
|
655 | 83f64091 | bellard | uint64_t cluster_offset; |
656 | 83f64091 | bellard | const uint8_t *src_buf;
|
657 | ce1a14dc | pbrook | |
658 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
659 | ce1a14dc | pbrook | |
660 | f141eafe | aliguori | if (ret < 0) |
661 | f141eafe | aliguori | goto done;
|
662 | 83f64091 | bellard | |
663 | ce1a14dc | pbrook | acb->nb_sectors -= acb->n; |
664 | ce1a14dc | pbrook | acb->sector_num += acb->n; |
665 | ce1a14dc | pbrook | acb->buf += acb->n * 512;
|
666 | 83f64091 | bellard | |
667 | ce1a14dc | pbrook | if (acb->nb_sectors == 0) { |
668 | 83f64091 | bellard | /* request completed */
|
669 | f141eafe | aliguori | ret = 0;
|
670 | f141eafe | aliguori | goto done;
|
671 | 83f64091 | bellard | } |
672 | 3b46e624 | ths | |
673 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
674 | ce1a14dc | pbrook | acb->n = s->cluster_sectors - index_in_cluster; |
675 | ce1a14dc | pbrook | if (acb->n > acb->nb_sectors)
|
676 | ce1a14dc | pbrook | acb->n = acb->nb_sectors; |
677 | 5fafdf24 | ths | cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, 1, 0, |
678 | 5fafdf24 | ths | index_in_cluster, |
679 | ce1a14dc | pbrook | index_in_cluster + acb->n); |
680 | 83f64091 | bellard | if (!cluster_offset || (cluster_offset & 511) != 0) { |
681 | 83f64091 | bellard | ret = -EIO; |
682 | f141eafe | aliguori | goto done;
|
683 | 83f64091 | bellard | } |
684 | 83f64091 | bellard | if (s->crypt_method) {
|
685 | ce1a14dc | pbrook | if (!acb->cluster_data) {
|
686 | ce1a14dc | pbrook | acb->cluster_data = qemu_mallocz(s->cluster_size); |
687 | ce1a14dc | pbrook | if (!acb->cluster_data) {
|
688 | 83f64091 | bellard | ret = -ENOMEM; |
689 | f141eafe | aliguori | goto done;
|
690 | 83f64091 | bellard | } |
691 | 83f64091 | bellard | } |
692 | 5fafdf24 | ths | encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf, |
693 | ce1a14dc | pbrook | acb->n, 1, &s->aes_encrypt_key);
|
694 | ce1a14dc | pbrook | src_buf = acb->cluster_data; |
695 | 83f64091 | bellard | } else {
|
696 | ce1a14dc | pbrook | src_buf = acb->buf; |
697 | 83f64091 | bellard | } |
698 | c87c0672 | aliguori | |
699 | c87c0672 | aliguori | acb->hd_iov.iov_base = (void *)src_buf;
|
700 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
701 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
702 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_writev(s->hd, |
703 | c87c0672 | aliguori | (cluster_offset >> 9) + index_in_cluster,
|
704 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, |
705 | c87c0672 | aliguori | qcow_aio_write_cb, acb); |
706 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
707 | f141eafe | aliguori | goto done;
|
708 | f141eafe | aliguori | return;
|
709 | f141eafe | aliguori | |
710 | f141eafe | aliguori | done:
|
711 | f141eafe | aliguori | if (acb->qiov->niov > 1) |
712 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
713 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
714 | f141eafe | aliguori | qemu_aio_release(acb); |
715 | 83f64091 | bellard | } |
716 | 83f64091 | bellard | |
717 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
|
718 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
719 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
720 | 83f64091 | bellard | { |
721 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
722 | ce1a14dc | pbrook | QCowAIOCB *acb; |
723 | 3b46e624 | ths | |
724 | 83f64091 | bellard | s->cluster_cache_offset = -1; /* disable compressed cache */ |
725 | 83f64091 | bellard | |
726 | c53ffce9 | Kevin Wolf | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
727 | ce1a14dc | pbrook | if (!acb)
|
728 | ce1a14dc | pbrook | return NULL; |
729 | ad53089b | Christoph Hellwig | |
730 | 3b46e624 | ths | |
731 | 83f64091 | bellard | qcow_aio_write_cb(acb, 0);
|
732 | ce1a14dc | pbrook | return &acb->common;
|
733 | 83f64091 | bellard | } |
734 | 83f64091 | bellard | |
735 | e2731add | bellard | static void qcow_close(BlockDriverState *bs) |
736 | ea2384d3 | bellard | { |
737 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
738 | ea2384d3 | bellard | qemu_free(s->l1_table); |
739 | ea2384d3 | bellard | qemu_free(s->l2_cache); |
740 | ea2384d3 | bellard | qemu_free(s->cluster_cache); |
741 | ea2384d3 | bellard | qemu_free(s->cluster_data); |
742 | 83f64091 | bellard | bdrv_delete(s->hd); |
743 | ea2384d3 | bellard | } |
744 | ea2384d3 | bellard | |
745 | 0e7e1989 | Kevin Wolf | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
746 | ea2384d3 | bellard | { |
747 | ea2384d3 | bellard | int fd, header_size, backing_filename_len, l1_size, i, shift;
|
748 | ea2384d3 | bellard | QCowHeader header; |
749 | ea2384d3 | bellard | uint64_t tmp; |
750 | 0e7e1989 | Kevin Wolf | int64_t total_size = 0;
|
751 | 0e7e1989 | Kevin Wolf | const char *backing_file = NULL; |
752 | 0e7e1989 | Kevin Wolf | int flags = 0; |
753 | 0e7e1989 | Kevin Wolf | |
754 | 0e7e1989 | Kevin Wolf | /* Read out options */
|
755 | 0e7e1989 | Kevin Wolf | while (options && options->name) {
|
756 | 0e7e1989 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
757 | 0e7e1989 | Kevin Wolf | total_size = options->value.n / 512;
|
758 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
759 | 0e7e1989 | Kevin Wolf | backing_file = options->value.s; |
760 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
761 | 0e7e1989 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
762 | 0e7e1989 | Kevin Wolf | } |
763 | 0e7e1989 | Kevin Wolf | options++; |
764 | 0e7e1989 | Kevin Wolf | } |
765 | ea2384d3 | bellard | |
766 | 83f64091 | bellard | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
767 | ea2384d3 | bellard | if (fd < 0) |
768 | ea2384d3 | bellard | return -1; |
769 | ea2384d3 | bellard | memset(&header, 0, sizeof(header)); |
770 | ea2384d3 | bellard | header.magic = cpu_to_be32(QCOW_MAGIC); |
771 | ea2384d3 | bellard | header.version = cpu_to_be32(QCOW_VERSION); |
772 | ea2384d3 | bellard | header.size = cpu_to_be64(total_size * 512);
|
773 | ea2384d3 | bellard | header_size = sizeof(header);
|
774 | ea2384d3 | bellard | backing_filename_len = 0;
|
775 | ea2384d3 | bellard | if (backing_file) {
|
776 | 7852e5da | aurel32 | if (strcmp(backing_file, "fat:")) { |
777 | 7852e5da | aurel32 | header.backing_file_offset = cpu_to_be64(header_size); |
778 | 7852e5da | aurel32 | backing_filename_len = strlen(backing_file); |
779 | 7852e5da | aurel32 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
780 | 7852e5da | aurel32 | header_size += backing_filename_len; |
781 | 7852e5da | aurel32 | } else {
|
782 | 7852e5da | aurel32 | /* special backing file for vvfat */
|
783 | 7852e5da | aurel32 | backing_file = NULL;
|
784 | 7852e5da | aurel32 | } |
785 | ea2384d3 | bellard | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
786 | ea2384d3 | bellard | unmodifyed sectors */
|
787 | ea2384d3 | bellard | header.l2_bits = 12; /* 32 KB L2 tables */ |
788 | ea2384d3 | bellard | } else {
|
789 | ea2384d3 | bellard | header.cluster_bits = 12; /* 4 KB clusters */ |
790 | ea2384d3 | bellard | header.l2_bits = 9; /* 4 KB L2 tables */ |
791 | ea2384d3 | bellard | } |
792 | ea2384d3 | bellard | header_size = (header_size + 7) & ~7; |
793 | ea2384d3 | bellard | shift = header.cluster_bits + header.l2_bits; |
794 | ea2384d3 | bellard | l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift; |
795 | ea2384d3 | bellard | |
796 | ea2384d3 | bellard | header.l1_table_offset = cpu_to_be64(header_size); |
797 | ec36ba14 | ths | if (flags & BLOCK_FLAG_ENCRYPT) {
|
798 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
799 | ea2384d3 | bellard | } else {
|
800 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
801 | ea2384d3 | bellard | } |
802 | 3b46e624 | ths | |
803 | ea2384d3 | bellard | /* write all the data */
|
804 | ea2384d3 | bellard | write(fd, &header, sizeof(header));
|
805 | ea2384d3 | bellard | if (backing_file) {
|
806 | 83f64091 | bellard | write(fd, backing_file, backing_filename_len); |
807 | ea2384d3 | bellard | } |
808 | ea2384d3 | bellard | lseek(fd, header_size, SEEK_SET); |
809 | ea2384d3 | bellard | tmp = 0;
|
810 | ea2384d3 | bellard | for(i = 0;i < l1_size; i++) { |
811 | ea2384d3 | bellard | write(fd, &tmp, sizeof(tmp));
|
812 | ea2384d3 | bellard | } |
813 | ea2384d3 | bellard | close(fd); |
814 | ea2384d3 | bellard | return 0; |
815 | ea2384d3 | bellard | } |
816 | ea2384d3 | bellard | |
817 | c47c33b0 | bellard | static int qcow_make_empty(BlockDriverState *bs) |
818 | 95389c86 | bellard | { |
819 | 95389c86 | bellard | BDRVQcowState *s = bs->opaque; |
820 | 95389c86 | bellard | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
821 | 83f64091 | bellard | int ret;
|
822 | 95389c86 | bellard | |
823 | 95389c86 | bellard | memset(s->l1_table, 0, l1_length);
|
824 | 83f64091 | bellard | if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0) |
825 | 95389c86 | bellard | return -1; |
826 | 83f64091 | bellard | ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length); |
827 | 83f64091 | bellard | if (ret < 0) |
828 | 83f64091 | bellard | return ret;
|
829 | 95389c86 | bellard | |
830 | 95389c86 | bellard | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
831 | 95389c86 | bellard | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); |
832 | 95389c86 | bellard | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); |
833 | 95389c86 | bellard | |
834 | 95389c86 | bellard | return 0; |
835 | 95389c86 | bellard | } |
836 | 95389c86 | bellard | |
837 | ea2384d3 | bellard | /* XXX: put compressed sectors first, then all the cluster aligned
|
838 | ea2384d3 | bellard | tables to avoid losing bytes in alignment */
|
839 | 5fafdf24 | ths | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
840 | c47c33b0 | bellard | const uint8_t *buf, int nb_sectors) |
841 | ea2384d3 | bellard | { |
842 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
843 | ea2384d3 | bellard | z_stream strm; |
844 | ea2384d3 | bellard | int ret, out_len;
|
845 | ea2384d3 | bellard | uint8_t *out_buf; |
846 | ea2384d3 | bellard | uint64_t cluster_offset; |
847 | ea2384d3 | bellard | |
848 | c47c33b0 | bellard | if (nb_sectors != s->cluster_sectors)
|
849 | c47c33b0 | bellard | return -EINVAL;
|
850 | ea2384d3 | bellard | |
851 | ea2384d3 | bellard | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
852 | ea2384d3 | bellard | if (!out_buf)
|
853 | ea2384d3 | bellard | return -1; |
854 | ea2384d3 | bellard | |
855 | ea2384d3 | bellard | /* best compression, small window, no zlib header */
|
856 | ea2384d3 | bellard | memset(&strm, 0, sizeof(strm)); |
857 | ea2384d3 | bellard | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
858 | 5fafdf24 | ths | Z_DEFLATED, -12,
|
859 | ea2384d3 | bellard | 9, Z_DEFAULT_STRATEGY);
|
860 | ea2384d3 | bellard | if (ret != 0) { |
861 | ea2384d3 | bellard | qemu_free(out_buf); |
862 | ea2384d3 | bellard | return -1; |
863 | ea2384d3 | bellard | } |
864 | ea2384d3 | bellard | |
865 | ea2384d3 | bellard | strm.avail_in = s->cluster_size; |
866 | ea2384d3 | bellard | strm.next_in = (uint8_t *)buf; |
867 | ea2384d3 | bellard | strm.avail_out = s->cluster_size; |
868 | ea2384d3 | bellard | strm.next_out = out_buf; |
869 | ea2384d3 | bellard | |
870 | ea2384d3 | bellard | ret = deflate(&strm, Z_FINISH); |
871 | ea2384d3 | bellard | if (ret != Z_STREAM_END && ret != Z_OK) {
|
872 | ea2384d3 | bellard | qemu_free(out_buf); |
873 | ea2384d3 | bellard | deflateEnd(&strm); |
874 | ea2384d3 | bellard | return -1; |
875 | ea2384d3 | bellard | } |
876 | ea2384d3 | bellard | out_len = strm.next_out - out_buf; |
877 | ea2384d3 | bellard | |
878 | ea2384d3 | bellard | deflateEnd(&strm); |
879 | ea2384d3 | bellard | |
880 | ea2384d3 | bellard | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
881 | ea2384d3 | bellard | /* could not compress: write normal cluster */
|
882 | ade40677 | Kevin Wolf | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
883 | ea2384d3 | bellard | } else {
|
884 | 5fafdf24 | ths | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
885 | ea2384d3 | bellard | out_len, 0, 0); |
886 | ea2384d3 | bellard | cluster_offset &= s->cluster_offset_mask; |
887 | 83f64091 | bellard | if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
|
888 | ea2384d3 | bellard | qemu_free(out_buf); |
889 | ea2384d3 | bellard | return -1; |
890 | ea2384d3 | bellard | } |
891 | ea2384d3 | bellard | } |
892 | 3b46e624 | ths | |
893 | ea2384d3 | bellard | qemu_free(out_buf); |
894 | ea2384d3 | bellard | return 0; |
895 | ea2384d3 | bellard | } |
896 | ea2384d3 | bellard | |
897 | 7a6cba61 | pbrook | static void qcow_flush(BlockDriverState *bs) |
898 | 7a6cba61 | pbrook | { |
899 | 7a6cba61 | pbrook | BDRVQcowState *s = bs->opaque; |
900 | 83f64091 | bellard | bdrv_flush(s->hd); |
901 | 7a6cba61 | pbrook | } |
902 | 7a6cba61 | pbrook | |
903 | c47c33b0 | bellard | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
904 | c47c33b0 | bellard | { |
905 | c47c33b0 | bellard | BDRVQcowState *s = bs->opaque; |
906 | c47c33b0 | bellard | bdi->cluster_size = s->cluster_size; |
907 | c47c33b0 | bellard | return 0; |
908 | c47c33b0 | bellard | } |
909 | c47c33b0 | bellard | |
910 | 0e7e1989 | Kevin Wolf | |
911 | 0e7e1989 | Kevin Wolf | static QEMUOptionParameter qcow_create_options[] = {
|
912 | db08adf5 | Kevin Wolf | { |
913 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_SIZE, |
914 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
915 | db08adf5 | Kevin Wolf | .help = "Virtual disk size"
|
916 | db08adf5 | Kevin Wolf | }, |
917 | db08adf5 | Kevin Wolf | { |
918 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FILE, |
919 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
920 | db08adf5 | Kevin Wolf | .help = "File name of a base image"
|
921 | db08adf5 | Kevin Wolf | }, |
922 | db08adf5 | Kevin Wolf | { |
923 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_ENCRYPT, |
924 | db08adf5 | Kevin Wolf | .type = OPT_FLAG, |
925 | db08adf5 | Kevin Wolf | .help = "Encrypt the image"
|
926 | db08adf5 | Kevin Wolf | }, |
927 | 0e7e1989 | Kevin Wolf | { NULL }
|
928 | 0e7e1989 | Kevin Wolf | }; |
929 | 0e7e1989 | Kevin Wolf | |
930 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_qcow = {
|
931 | e60f469c | aurel32 | .format_name = "qcow",
|
932 | e60f469c | aurel32 | .instance_size = sizeof(BDRVQcowState),
|
933 | e60f469c | aurel32 | .bdrv_probe = qcow_probe, |
934 | e60f469c | aurel32 | .bdrv_open = qcow_open, |
935 | e60f469c | aurel32 | .bdrv_close = qcow_close, |
936 | e60f469c | aurel32 | .bdrv_create = qcow_create, |
937 | e60f469c | aurel32 | .bdrv_flush = qcow_flush, |
938 | e60f469c | aurel32 | .bdrv_is_allocated = qcow_is_allocated, |
939 | e60f469c | aurel32 | .bdrv_set_key = qcow_set_key, |
940 | e60f469c | aurel32 | .bdrv_make_empty = qcow_make_empty, |
941 | f141eafe | aliguori | .bdrv_aio_readv = qcow_aio_readv, |
942 | f141eafe | aliguori | .bdrv_aio_writev = qcow_aio_writev, |
943 | c47c33b0 | bellard | .bdrv_write_compressed = qcow_write_compressed, |
944 | e60f469c | aurel32 | .bdrv_get_info = qcow_get_info, |
945 | 0e7e1989 | Kevin Wolf | |
946 | 0e7e1989 | Kevin Wolf | .create_options = qcow_create_options, |
947 | ea2384d3 | bellard | }; |
948 | 5efa9d5a | Anthony Liguori | |
949 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow_init(void) |
950 | 5efa9d5a | Anthony Liguori | { |
951 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow); |
952 | 5efa9d5a | Anthony Liguori | } |
953 | 5efa9d5a | Anthony Liguori | |
954 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow_init); |