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