root / block / qcow.c @ 7371d56f
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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 | 737e150e | Paolo Bonzini | #include "block/block_int.h" |
26 | 1de7afc9 | Paolo Bonzini | #include "qemu/module.h" |
27 | 28d34b82 | bellard | #include <zlib.h> |
28 | 737e150e | Paolo Bonzini | #include "block/aes.h" |
29 | caf71f86 | Paolo Bonzini | #include "migration/migration.h" |
30 | ea2384d3 | bellard | |
31 | ea2384d3 | bellard | /**************************************************************/
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32 | ea2384d3 | bellard | /* QEMU COW block driver with compression and encryption support */
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33 | ea2384d3 | bellard | |
34 | ea2384d3 | bellard | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
35 | ea2384d3 | bellard | #define QCOW_VERSION 1 |
36 | ea2384d3 | bellard | |
37 | ea2384d3 | bellard | #define QCOW_CRYPT_NONE 0 |
38 | ea2384d3 | bellard | #define QCOW_CRYPT_AES 1 |
39 | ea2384d3 | bellard | |
40 | ea2384d3 | bellard | #define QCOW_OFLAG_COMPRESSED (1LL << 63) |
41 | ea2384d3 | bellard | |
42 | ea2384d3 | bellard | typedef struct QCowHeader { |
43 | ea2384d3 | bellard | uint32_t magic; |
44 | ea2384d3 | bellard | uint32_t version; |
45 | ea2384d3 | bellard | uint64_t backing_file_offset; |
46 | ea2384d3 | bellard | uint32_t backing_file_size; |
47 | ea2384d3 | bellard | uint32_t mtime; |
48 | ea2384d3 | bellard | uint64_t size; /* in bytes */
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49 | ea2384d3 | bellard | uint8_t cluster_bits; |
50 | ea2384d3 | bellard | uint8_t l2_bits; |
51 | ea2384d3 | bellard | uint32_t crypt_method; |
52 | ea2384d3 | bellard | uint64_t l1_table_offset; |
53 | ea2384d3 | bellard | } QCowHeader; |
54 | ea2384d3 | bellard | |
55 | ea2384d3 | bellard | #define L2_CACHE_SIZE 16 |
56 | ea2384d3 | bellard | |
57 | ea2384d3 | bellard | typedef struct BDRVQcowState { |
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 | 52b8eb60 | Kevin Wolf | CoMutex lock; |
78 | fd9f102c | Kevin Wolf | Error *migration_blocker; |
79 | ea2384d3 | bellard | } BDRVQcowState; |
80 | ea2384d3 | bellard | |
81 | 66f82cee | Kevin Wolf | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
82 | ea2384d3 | bellard | |
83 | ea2384d3 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
84 | ea2384d3 | bellard | { |
85 | ea2384d3 | bellard | const QCowHeader *cow_header = (const void *)buf; |
86 | 3b46e624 | ths | |
87 | 712e7874 | bellard | if (buf_size >= sizeof(QCowHeader) && |
88 | 712e7874 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
89 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
90 | ea2384d3 | bellard | return 100; |
91 | ea2384d3 | bellard | else
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92 | ea2384d3 | bellard | return 0; |
93 | ea2384d3 | bellard | } |
94 | ea2384d3 | bellard | |
95 | 66f82cee | Kevin Wolf | static int qcow_open(BlockDriverState *bs, int flags) |
96 | ea2384d3 | bellard | { |
97 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
98 | 84b0ec02 | Li Zhi Hui | int len, i, shift, ret;
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99 | ea2384d3 | bellard | QCowHeader header; |
100 | 83f64091 | bellard | |
101 | 84b0ec02 | Li Zhi Hui | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
102 | 84b0ec02 | Li Zhi Hui | if (ret < 0) { |
103 | ea2384d3 | bellard | goto fail;
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104 | 84b0ec02 | Li Zhi Hui | } |
105 | ea2384d3 | bellard | be32_to_cpus(&header.magic); |
106 | ea2384d3 | bellard | be32_to_cpus(&header.version); |
107 | ea2384d3 | bellard | be64_to_cpus(&header.backing_file_offset); |
108 | ea2384d3 | bellard | be32_to_cpus(&header.backing_file_size); |
109 | ea2384d3 | bellard | be32_to_cpus(&header.mtime); |
110 | ea2384d3 | bellard | be64_to_cpus(&header.size); |
111 | ea2384d3 | bellard | be32_to_cpus(&header.crypt_method); |
112 | ea2384d3 | bellard | be64_to_cpus(&header.l1_table_offset); |
113 | 3b46e624 | ths | |
114 | 84b0ec02 | Li Zhi Hui | if (header.magic != QCOW_MAGIC) {
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115 | 84b0ec02 | Li Zhi Hui | ret = -EINVAL; |
116 | 84b0ec02 | Li Zhi Hui | goto fail;
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117 | 84b0ec02 | Li Zhi Hui | } |
118 | 84b0ec02 | Li Zhi Hui | if (header.version != QCOW_VERSION) {
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119 | 84b0ec02 | Li Zhi Hui | char version[64]; |
120 | 84b0ec02 | Li Zhi Hui | snprintf(version, sizeof(version), "QCOW version %d", header.version); |
121 | 84b0ec02 | Li Zhi Hui | qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
122 | 84b0ec02 | Li Zhi Hui | bs->device_name, "qcow", version);
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123 | 84b0ec02 | Li Zhi Hui | ret = -ENOTSUP; |
124 | ea2384d3 | bellard | goto fail;
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125 | 84b0ec02 | Li Zhi Hui | } |
126 | 84b0ec02 | Li Zhi Hui | |
127 | 84b0ec02 | Li Zhi Hui | if (header.size <= 1 || header.cluster_bits < 9) { |
128 | 84b0ec02 | Li Zhi Hui | ret = -EINVAL; |
129 | ea2384d3 | bellard | goto fail;
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130 | 84b0ec02 | Li Zhi Hui | } |
131 | 84b0ec02 | Li Zhi Hui | if (header.crypt_method > QCOW_CRYPT_AES) {
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132 | 84b0ec02 | Li Zhi Hui | ret = -EINVAL; |
133 | ea2384d3 | bellard | goto fail;
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134 | 84b0ec02 | Li Zhi Hui | } |
135 | ea2384d3 | bellard | s->crypt_method_header = header.crypt_method; |
136 | 84b0ec02 | Li Zhi Hui | if (s->crypt_method_header) {
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137 | ea2384d3 | bellard | bs->encrypted = 1;
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138 | 84b0ec02 | Li Zhi Hui | } |
139 | ea2384d3 | bellard | s->cluster_bits = header.cluster_bits; |
140 | ea2384d3 | bellard | s->cluster_size = 1 << s->cluster_bits;
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141 | ea2384d3 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
142 | ea2384d3 | bellard | s->l2_bits = header.l2_bits; |
143 | ea2384d3 | bellard | s->l2_size = 1 << s->l2_bits;
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144 | ea2384d3 | bellard | bs->total_sectors = header.size / 512;
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145 | ea2384d3 | bellard | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; |
146 | ea2384d3 | bellard | |
147 | ea2384d3 | bellard | /* read the level 1 table */
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148 | ea2384d3 | bellard | shift = s->cluster_bits + s->l2_bits; |
149 | ea2384d3 | bellard | s->l1_size = (header.size + (1LL << shift) - 1) >> shift; |
150 | ea2384d3 | bellard | |
151 | ea2384d3 | bellard | s->l1_table_offset = header.l1_table_offset; |
152 | 7267c094 | Anthony Liguori | s->l1_table = g_malloc(s->l1_size * sizeof(uint64_t));
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153 | 84b0ec02 | Li Zhi Hui | |
154 | 84b0ec02 | Li Zhi Hui | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
155 | 84b0ec02 | Li Zhi Hui | s->l1_size * sizeof(uint64_t));
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156 | 84b0ec02 | Li Zhi Hui | if (ret < 0) { |
157 | ea2384d3 | bellard | goto fail;
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158 | 84b0ec02 | Li Zhi Hui | } |
159 | 84b0ec02 | Li Zhi Hui | |
160 | ea2384d3 | bellard | for(i = 0;i < s->l1_size; i++) { |
161 | ea2384d3 | bellard | be64_to_cpus(&s->l1_table[i]); |
162 | ea2384d3 | bellard | } |
163 | ea2384d3 | bellard | /* alloc L2 cache */
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164 | 7267c094 | Anthony Liguori | s->l2_cache = g_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
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165 | 7267c094 | Anthony Liguori | s->cluster_cache = g_malloc(s->cluster_size); |
166 | 7267c094 | Anthony Liguori | s->cluster_data = g_malloc(s->cluster_size); |
167 | ea2384d3 | bellard | s->cluster_cache_offset = -1;
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168 | 3b46e624 | ths | |
169 | ea2384d3 | bellard | /* read the backing file name */
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170 | ea2384d3 | bellard | if (header.backing_file_offset != 0) { |
171 | ea2384d3 | bellard | len = header.backing_file_size; |
172 | 84b0ec02 | Li Zhi Hui | if (len > 1023) { |
173 | ea2384d3 | bellard | len = 1023;
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174 | 84b0ec02 | Li Zhi Hui | } |
175 | 84b0ec02 | Li Zhi Hui | ret = bdrv_pread(bs->file, header.backing_file_offset, |
176 | 84b0ec02 | Li Zhi Hui | bs->backing_file, len); |
177 | 84b0ec02 | Li Zhi Hui | if (ret < 0) { |
178 | ea2384d3 | bellard | goto fail;
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179 | 84b0ec02 | Li Zhi Hui | } |
180 | ea2384d3 | bellard | bs->backing_file[len] = '\0';
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181 | ea2384d3 | bellard | } |
182 | de33b1f3 | Scott Wood | |
183 | fd9f102c | Kevin Wolf | /* Disable migration when qcow images are used */
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184 | fd9f102c | Kevin Wolf | error_set(&s->migration_blocker, |
185 | fd9f102c | Kevin Wolf | QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
186 | fd9f102c | Kevin Wolf | "qcow", bs->device_name, "live migration"); |
187 | fd9f102c | Kevin Wolf | migrate_add_blocker(s->migration_blocker); |
188 | fd9f102c | Kevin Wolf | |
189 | de33b1f3 | Scott Wood | qemu_co_mutex_init(&s->lock); |
190 | ea2384d3 | bellard | return 0; |
191 | ea2384d3 | bellard | |
192 | ea2384d3 | bellard | fail:
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193 | 7267c094 | Anthony Liguori | g_free(s->l1_table); |
194 | 7267c094 | Anthony Liguori | g_free(s->l2_cache); |
195 | 7267c094 | Anthony Liguori | g_free(s->cluster_cache); |
196 | 7267c094 | Anthony Liguori | g_free(s->cluster_data); |
197 | 84b0ec02 | Li Zhi Hui | return ret;
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198 | ea2384d3 | bellard | } |
199 | ea2384d3 | bellard | |
200 | d177692e | Jeff Cody | |
201 | d177692e | Jeff Cody | /* We have nothing to do for QCOW reopen, stubs just return
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202 | d177692e | Jeff Cody | * success */
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203 | d177692e | Jeff Cody | static int qcow_reopen_prepare(BDRVReopenState *state, |
204 | d177692e | Jeff Cody | BlockReopenQueue *queue, Error **errp) |
205 | d177692e | Jeff Cody | { |
206 | d177692e | Jeff Cody | return 0; |
207 | d177692e | Jeff Cody | } |
208 | d177692e | Jeff Cody | |
209 | ea2384d3 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
210 | ea2384d3 | bellard | { |
211 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
212 | ea2384d3 | bellard | uint8_t keybuf[16];
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213 | ea2384d3 | bellard | int len, i;
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214 | 3b46e624 | ths | |
215 | ea2384d3 | bellard | memset(keybuf, 0, 16); |
216 | ea2384d3 | bellard | len = strlen(key); |
217 | ea2384d3 | bellard | if (len > 16) |
218 | ea2384d3 | bellard | len = 16;
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219 | ea2384d3 | bellard | /* XXX: we could compress the chars to 7 bits to increase
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220 | ea2384d3 | bellard | entropy */
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221 | ea2384d3 | bellard | for(i = 0;i < len;i++) { |
222 | ea2384d3 | bellard | keybuf[i] = key[i]; |
223 | ea2384d3 | bellard | } |
224 | ea2384d3 | bellard | s->crypt_method = s->crypt_method_header; |
225 | ea2384d3 | bellard | |
226 | ea2384d3 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
227 | ea2384d3 | bellard | return -1; |
228 | ea2384d3 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
229 | ea2384d3 | bellard | return -1; |
230 | ea2384d3 | bellard | return 0; |
231 | ea2384d3 | bellard | } |
232 | ea2384d3 | bellard | |
233 | ea2384d3 | bellard | /* The crypt function is compatible with the linux cryptoloop
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234 | ea2384d3 | bellard | algorithm for < 4 GB images. NOTE: out_buf == in_buf is
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235 | ea2384d3 | bellard | supported */
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236 | ea2384d3 | bellard | static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num, |
237 | ea2384d3 | bellard | uint8_t *out_buf, const uint8_t *in_buf,
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238 | ea2384d3 | bellard | int nb_sectors, int enc, |
239 | ea2384d3 | bellard | const AES_KEY *key)
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240 | ea2384d3 | bellard | { |
241 | ea2384d3 | bellard | union {
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242 | ea2384d3 | bellard | uint64_t ll[2];
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243 | ea2384d3 | bellard | uint8_t b[16];
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244 | ea2384d3 | bellard | } ivec; |
245 | ea2384d3 | bellard | int i;
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246 | ea2384d3 | bellard | |
247 | ea2384d3 | bellard | for(i = 0; i < nb_sectors; i++) { |
248 | ea2384d3 | bellard | ivec.ll[0] = cpu_to_le64(sector_num);
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249 | ea2384d3 | bellard | ivec.ll[1] = 0; |
250 | 5fafdf24 | ths | AES_cbc_encrypt(in_buf, out_buf, 512, key,
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251 | ea2384d3 | bellard | ivec.b, enc); |
252 | ea2384d3 | bellard | sector_num++; |
253 | ea2384d3 | bellard | in_buf += 512;
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254 | ea2384d3 | bellard | out_buf += 512;
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255 | ea2384d3 | bellard | } |
256 | ea2384d3 | bellard | } |
257 | ea2384d3 | bellard | |
258 | ea2384d3 | bellard | /* 'allocate' is:
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259 | ea2384d3 | bellard | *
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260 | ea2384d3 | bellard | * 0 to not allocate.
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261 | ea2384d3 | bellard | *
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262 | ea2384d3 | bellard | * 1 to allocate a normal cluster (for sector indexes 'n_start' to
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263 | ea2384d3 | bellard | * 'n_end')
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264 | ea2384d3 | bellard | *
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265 | ea2384d3 | bellard | * 2 to allocate a compressed cluster of size
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266 | ea2384d3 | bellard | * 'compressed_size'. 'compressed_size' must be > 0 and <
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267 | 5fafdf24 | ths | * cluster_size
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268 | ea2384d3 | bellard | *
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269 | ea2384d3 | bellard | * return 0 if not allocated.
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270 | ea2384d3 | bellard | */
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271 | ea2384d3 | bellard | static uint64_t get_cluster_offset(BlockDriverState *bs,
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272 | ea2384d3 | bellard | uint64_t offset, int allocate,
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273 | ea2384d3 | bellard | int compressed_size,
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274 | ea2384d3 | bellard | int n_start, int n_end) |
275 | ea2384d3 | bellard | { |
276 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
277 | ea2384d3 | bellard | int min_index, i, j, l1_index, l2_index;
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278 | ea2384d3 | bellard | uint64_t l2_offset, *l2_table, cluster_offset, tmp; |
279 | ea2384d3 | bellard | uint32_t min_count; |
280 | ea2384d3 | bellard | int new_l2_table;
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281 | 3b46e624 | ths | |
282 | ea2384d3 | bellard | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
283 | ea2384d3 | bellard | l2_offset = s->l1_table[l1_index]; |
284 | ea2384d3 | bellard | new_l2_table = 0;
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285 | ea2384d3 | bellard | if (!l2_offset) {
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286 | ea2384d3 | bellard | if (!allocate)
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287 | ea2384d3 | bellard | return 0; |
288 | ea2384d3 | bellard | /* allocate a new l2 entry */
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289 | 66f82cee | Kevin Wolf | l2_offset = bdrv_getlength(bs->file); |
290 | ea2384d3 | bellard | /* round to cluster size */
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291 | ea2384d3 | bellard | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); |
292 | ea2384d3 | bellard | /* update the L1 entry */
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293 | ea2384d3 | bellard | s->l1_table[l1_index] = l2_offset; |
294 | ea2384d3 | bellard | tmp = cpu_to_be64(l2_offset); |
295 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file,
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296 | 5e5557d9 | Kevin Wolf | s->l1_table_offset + l1_index * sizeof(tmp),
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297 | 5e5557d9 | Kevin Wolf | &tmp, sizeof(tmp)) < 0) |
298 | ea2384d3 | bellard | return 0; |
299 | ea2384d3 | bellard | new_l2_table = 1;
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300 | ea2384d3 | bellard | } |
301 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
302 | ea2384d3 | bellard | if (l2_offset == s->l2_cache_offsets[i]) {
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303 | ea2384d3 | bellard | /* increment the hit count */
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304 | ea2384d3 | bellard | if (++s->l2_cache_counts[i] == 0xffffffff) { |
305 | ea2384d3 | bellard | for(j = 0; j < L2_CACHE_SIZE; j++) { |
306 | ea2384d3 | bellard | s->l2_cache_counts[j] >>= 1;
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307 | ea2384d3 | bellard | } |
308 | ea2384d3 | bellard | } |
309 | ea2384d3 | bellard | l2_table = s->l2_cache + (i << s->l2_bits); |
310 | ea2384d3 | bellard | goto found;
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311 | ea2384d3 | bellard | } |
312 | ea2384d3 | bellard | } |
313 | ea2384d3 | bellard | /* not found: load a new entry in the least used one */
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314 | ea2384d3 | bellard | min_index = 0;
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315 | ea2384d3 | bellard | min_count = 0xffffffff;
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316 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
317 | ea2384d3 | bellard | if (s->l2_cache_counts[i] < min_count) {
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318 | ea2384d3 | bellard | min_count = s->l2_cache_counts[i]; |
319 | ea2384d3 | bellard | min_index = i; |
320 | ea2384d3 | bellard | } |
321 | ea2384d3 | bellard | } |
322 | ea2384d3 | bellard | l2_table = s->l2_cache + (min_index << s->l2_bits); |
323 | ea2384d3 | bellard | if (new_l2_table) {
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324 | ea2384d3 | bellard | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
325 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file, l2_offset, l2_table,
|
326 | 5e5557d9 | Kevin Wolf | s->l2_size * sizeof(uint64_t)) < 0) |
327 | ea2384d3 | bellard | return 0; |
328 | ea2384d3 | bellard | } else {
|
329 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != |
330 | ea2384d3 | bellard | s->l2_size * sizeof(uint64_t))
|
331 | ea2384d3 | bellard | return 0; |
332 | ea2384d3 | bellard | } |
333 | ea2384d3 | bellard | s->l2_cache_offsets[min_index] = l2_offset; |
334 | ea2384d3 | bellard | s->l2_cache_counts[min_index] = 1;
|
335 | ea2384d3 | bellard | found:
|
336 | ea2384d3 | bellard | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
|
337 | ea2384d3 | bellard | cluster_offset = be64_to_cpu(l2_table[l2_index]); |
338 | 5fafdf24 | ths | if (!cluster_offset ||
|
339 | ea2384d3 | bellard | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
|
340 | ea2384d3 | bellard | if (!allocate)
|
341 | ea2384d3 | bellard | return 0; |
342 | ea2384d3 | bellard | /* allocate a new cluster */
|
343 | ea2384d3 | bellard | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) &&
|
344 | ea2384d3 | bellard | (n_end - n_start) < s->cluster_sectors) { |
345 | ea2384d3 | bellard | /* if the cluster is already compressed, we must
|
346 | ea2384d3 | bellard | decompress it in the case it is not completely
|
347 | ea2384d3 | bellard | overwritten */
|
348 | 66f82cee | Kevin Wolf | if (decompress_cluster(bs, cluster_offset) < 0) |
349 | ea2384d3 | bellard | return 0; |
350 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
351 | 5fafdf24 | ths | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
352 | ea2384d3 | bellard | ~(s->cluster_size - 1);
|
353 | ea2384d3 | bellard | /* write the cluster content */
|
354 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, s->cluster_size) !=
|
355 | ea2384d3 | bellard | s->cluster_size) |
356 | ea2384d3 | bellard | return -1; |
357 | ea2384d3 | bellard | } else {
|
358 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
359 | 7f48fa1f | aliguori | if (allocate == 1) { |
360 | 7f48fa1f | aliguori | /* round to cluster size */
|
361 | 7f48fa1f | aliguori | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
362 | 7f48fa1f | aliguori | ~(s->cluster_size - 1);
|
363 | 66f82cee | Kevin Wolf | bdrv_truncate(bs->file, cluster_offset + s->cluster_size); |
364 | 7f48fa1f | aliguori | /* if encrypted, we must initialize the cluster
|
365 | 7f48fa1f | aliguori | content which won't be written */
|
366 | 7f48fa1f | aliguori | if (s->crypt_method &&
|
367 | 7f48fa1f | aliguori | (n_end - n_start) < s->cluster_sectors) { |
368 | 7f48fa1f | aliguori | uint64_t start_sect; |
369 | 7f48fa1f | aliguori | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; |
370 | 7f48fa1f | aliguori | memset(s->cluster_data + 512, 0x00, 512); |
371 | 7f48fa1f | aliguori | for(i = 0; i < s->cluster_sectors; i++) { |
372 | 7f48fa1f | aliguori | if (i < n_start || i >= n_end) {
|
373 | 7f48fa1f | aliguori | encrypt_sectors(s, start_sect + i, |
374 | 7f48fa1f | aliguori | s->cluster_data, |
375 | 7f48fa1f | aliguori | s->cluster_data + 512, 1, 1, |
376 | 7f48fa1f | aliguori | &s->aes_encrypt_key); |
377 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset + i * 512, |
378 | 7f48fa1f | aliguori | s->cluster_data, 512) != 512) |
379 | 7f48fa1f | aliguori | return -1; |
380 | 7f48fa1f | aliguori | } |
381 | ea2384d3 | bellard | } |
382 | ea2384d3 | bellard | } |
383 | 7f48fa1f | aliguori | } else if (allocate == 2) { |
384 | 7f48fa1f | aliguori | cluster_offset |= QCOW_OFLAG_COMPRESSED | |
385 | 7f48fa1f | aliguori | (uint64_t)compressed_size << (63 - s->cluster_bits);
|
386 | ea2384d3 | bellard | } |
387 | ea2384d3 | bellard | } |
388 | ea2384d3 | bellard | /* update L2 table */
|
389 | ea2384d3 | bellard | tmp = cpu_to_be64(cluster_offset); |
390 | ea2384d3 | bellard | l2_table[l2_index] = tmp; |
391 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
392 | 5e5557d9 | Kevin Wolf | &tmp, sizeof(tmp)) < 0) |
393 | ea2384d3 | bellard | return 0; |
394 | ea2384d3 | bellard | } |
395 | ea2384d3 | bellard | return cluster_offset;
|
396 | ea2384d3 | bellard | } |
397 | ea2384d3 | bellard | |
398 | f8a2e5e3 | Stefan Hajnoczi | static int coroutine_fn qcow_co_is_allocated(BlockDriverState *bs, |
399 | f8a2e5e3 | Stefan Hajnoczi | int64_t sector_num, int nb_sectors, int *pnum) |
400 | ea2384d3 | bellard | { |
401 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
402 | ea2384d3 | bellard | int index_in_cluster, n;
|
403 | ea2384d3 | bellard | uint64_t cluster_offset; |
404 | ea2384d3 | bellard | |
405 | f8a2e5e3 | Stefan Hajnoczi | qemu_co_mutex_lock(&s->lock); |
406 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
407 | f8a2e5e3 | Stefan Hajnoczi | qemu_co_mutex_unlock(&s->lock); |
408 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
409 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster; |
410 | ea2384d3 | bellard | if (n > nb_sectors)
|
411 | ea2384d3 | bellard | n = nb_sectors; |
412 | ea2384d3 | bellard | *pnum = n; |
413 | ea2384d3 | bellard | return (cluster_offset != 0); |
414 | ea2384d3 | bellard | } |
415 | ea2384d3 | bellard | |
416 | ea2384d3 | bellard | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, |
417 | ea2384d3 | bellard | const uint8_t *buf, int buf_size) |
418 | ea2384d3 | bellard | { |
419 | ea2384d3 | bellard | z_stream strm1, *strm = &strm1; |
420 | ea2384d3 | bellard | int ret, out_len;
|
421 | ea2384d3 | bellard | |
422 | ea2384d3 | bellard | memset(strm, 0, sizeof(*strm)); |
423 | ea2384d3 | bellard | |
424 | ea2384d3 | bellard | strm->next_in = (uint8_t *)buf; |
425 | ea2384d3 | bellard | strm->avail_in = buf_size; |
426 | ea2384d3 | bellard | strm->next_out = out_buf; |
427 | ea2384d3 | bellard | strm->avail_out = out_buf_size; |
428 | ea2384d3 | bellard | |
429 | ea2384d3 | bellard | ret = inflateInit2(strm, -12);
|
430 | ea2384d3 | bellard | if (ret != Z_OK)
|
431 | ea2384d3 | bellard | return -1; |
432 | ea2384d3 | bellard | ret = inflate(strm, Z_FINISH); |
433 | ea2384d3 | bellard | out_len = strm->next_out - out_buf; |
434 | ea2384d3 | bellard | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) ||
|
435 | ea2384d3 | bellard | out_len != out_buf_size) { |
436 | ea2384d3 | bellard | inflateEnd(strm); |
437 | ea2384d3 | bellard | return -1; |
438 | ea2384d3 | bellard | } |
439 | ea2384d3 | bellard | inflateEnd(strm); |
440 | ea2384d3 | bellard | return 0; |
441 | ea2384d3 | bellard | } |
442 | 3b46e624 | ths | |
443 | 66f82cee | Kevin Wolf | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
444 | ea2384d3 | bellard | { |
445 | 66f82cee | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
446 | ea2384d3 | bellard | int ret, csize;
|
447 | ea2384d3 | bellard | uint64_t coffset; |
448 | ea2384d3 | bellard | |
449 | ea2384d3 | bellard | coffset = cluster_offset & s->cluster_offset_mask; |
450 | ea2384d3 | bellard | if (s->cluster_cache_offset != coffset) {
|
451 | ea2384d3 | bellard | csize = cluster_offset >> (63 - s->cluster_bits);
|
452 | ea2384d3 | bellard | csize &= (s->cluster_size - 1);
|
453 | 66f82cee | Kevin Wolf | ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize); |
454 | 5fafdf24 | ths | if (ret != csize)
|
455 | ea2384d3 | bellard | return -1; |
456 | ea2384d3 | bellard | if (decompress_buffer(s->cluster_cache, s->cluster_size,
|
457 | ea2384d3 | bellard | s->cluster_data, csize) < 0) {
|
458 | ea2384d3 | bellard | return -1; |
459 | ea2384d3 | bellard | } |
460 | ea2384d3 | bellard | s->cluster_cache_offset = coffset; |
461 | ea2384d3 | bellard | } |
462 | ea2384d3 | bellard | return 0; |
463 | ea2384d3 | bellard | } |
464 | ea2384d3 | bellard | |
465 | a968168c | Dong Xu Wang | static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, |
466 | 27deebe8 | Frediano Ziglio | int nb_sectors, QEMUIOVector *qiov)
|
467 | 83f64091 | bellard | { |
468 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
469 | 83f64091 | bellard | int index_in_cluster;
|
470 | 27deebe8 | Frediano Ziglio | int ret = 0, n; |
471 | 43ca85b5 | Frediano Ziglio | uint64_t cluster_offset; |
472 | 430bbaaa | Frediano Ziglio | struct iovec hd_iov;
|
473 | 430bbaaa | Frediano Ziglio | QEMUIOVector hd_qiov; |
474 | 27deebe8 | Frediano Ziglio | uint8_t *buf; |
475 | 27deebe8 | Frediano Ziglio | void *orig_buf;
|
476 | 83f64091 | bellard | |
477 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
478 | 27deebe8 | Frediano Ziglio | buf = orig_buf = qemu_blockalign(bs, qiov->size); |
479 | 27deebe8 | Frediano Ziglio | } else {
|
480 | 27deebe8 | Frediano Ziglio | orig_buf = NULL;
|
481 | 27deebe8 | Frediano Ziglio | buf = (uint8_t *)qiov->iov->iov_base; |
482 | 83f64091 | bellard | } |
483 | 3b46e624 | ths | |
484 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
485 | 27deebe8 | Frediano Ziglio | |
486 | 27deebe8 | Frediano Ziglio | while (nb_sectors != 0) { |
487 | 27deebe8 | Frediano Ziglio | /* prepare next request */
|
488 | 27deebe8 | Frediano Ziglio | cluster_offset = get_cluster_offset(bs, sector_num << 9,
|
489 | 27deebe8 | Frediano Ziglio | 0, 0, 0, 0); |
490 | 27deebe8 | Frediano Ziglio | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
491 | 27deebe8 | Frediano Ziglio | n = s->cluster_sectors - index_in_cluster; |
492 | 27deebe8 | Frediano Ziglio | if (n > nb_sectors) {
|
493 | 27deebe8 | Frediano Ziglio | n = nb_sectors; |
494 | 27deebe8 | Frediano Ziglio | } |
495 | ce1a14dc | pbrook | |
496 | 27deebe8 | Frediano Ziglio | if (!cluster_offset) {
|
497 | 27deebe8 | Frediano Ziglio | if (bs->backing_hd) {
|
498 | 27deebe8 | Frediano Ziglio | /* read from the base image */
|
499 | 27deebe8 | Frediano Ziglio | hd_iov.iov_base = (void *)buf;
|
500 | 27deebe8 | Frediano Ziglio | hd_iov.iov_len = n * 512;
|
501 | 27deebe8 | Frediano Ziglio | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
|
502 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
503 | 27deebe8 | Frediano Ziglio | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
504 | 27deebe8 | Frediano Ziglio | n, &hd_qiov); |
505 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
506 | 27deebe8 | Frediano Ziglio | if (ret < 0) { |
507 | 27deebe8 | Frediano Ziglio | goto fail;
|
508 | 27deebe8 | Frediano Ziglio | } |
509 | 27deebe8 | Frediano Ziglio | } else {
|
510 | 27deebe8 | Frediano Ziglio | /* Note: in this case, no need to wait */
|
511 | 27deebe8 | Frediano Ziglio | memset(buf, 0, 512 * n); |
512 | 27deebe8 | Frediano Ziglio | } |
513 | 27deebe8 | Frediano Ziglio | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
514 | 27deebe8 | Frediano Ziglio | /* add AIO support for compressed blocks ? */
|
515 | 27deebe8 | Frediano Ziglio | if (decompress_cluster(bs, cluster_offset) < 0) { |
516 | 27deebe8 | Frediano Ziglio | goto fail;
|
517 | 27deebe8 | Frediano Ziglio | } |
518 | 27deebe8 | Frediano Ziglio | memcpy(buf, |
519 | 27deebe8 | Frediano Ziglio | s->cluster_cache + index_in_cluster * 512, 512 * n); |
520 | 27deebe8 | Frediano Ziglio | } else {
|
521 | 27deebe8 | Frediano Ziglio | if ((cluster_offset & 511) != 0) { |
522 | 27deebe8 | Frediano Ziglio | goto fail;
|
523 | 27deebe8 | Frediano Ziglio | } |
524 | 27deebe8 | Frediano Ziglio | hd_iov.iov_base = (void *)buf;
|
525 | 430bbaaa | Frediano Ziglio | hd_iov.iov_len = n * 512;
|
526 | 430bbaaa | Frediano Ziglio | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
|
527 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
528 | 27deebe8 | Frediano Ziglio | ret = bdrv_co_readv(bs->file, |
529 | 27deebe8 | Frediano Ziglio | (cluster_offset >> 9) + index_in_cluster,
|
530 | 430bbaaa | Frediano Ziglio | n, &hd_qiov); |
531 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_lock(&s->lock); |
532 | 52b8eb60 | Kevin Wolf | if (ret < 0) { |
533 | 27deebe8 | Frediano Ziglio | break;
|
534 | 27deebe8 | Frediano Ziglio | } |
535 | 27deebe8 | Frediano Ziglio | if (s->crypt_method) {
|
536 | 27deebe8 | Frediano Ziglio | encrypt_sectors(s, sector_num, buf, buf, |
537 | 27deebe8 | Frediano Ziglio | n, 0,
|
538 | 27deebe8 | Frediano Ziglio | &s->aes_decrypt_key); |
539 | 5614c188 | Stefan Weil | } |
540 | 5614c188 | Stefan Weil | } |
541 | 27deebe8 | Frediano Ziglio | ret = 0;
|
542 | f141eafe | aliguori | |
543 | 27deebe8 | Frediano Ziglio | nb_sectors -= n; |
544 | 27deebe8 | Frediano Ziglio | sector_num += n; |
545 | 27deebe8 | Frediano Ziglio | buf += n * 512;
|
546 | 43ca85b5 | Frediano Ziglio | } |
547 | 43ca85b5 | Frediano Ziglio | |
548 | 27deebe8 | Frediano Ziglio | done:
|
549 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
550 | 52b8eb60 | Kevin Wolf | |
551 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
552 | 03396148 | Michael Tokarev | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size);
|
553 | 27deebe8 | Frediano Ziglio | qemu_vfree(orig_buf); |
554 | b11a24de | Kevin Wolf | } |
555 | b11a24de | Kevin Wolf | |
556 | 52b8eb60 | Kevin Wolf | return ret;
|
557 | 27deebe8 | Frediano Ziglio | |
558 | 27deebe8 | Frediano Ziglio | fail:
|
559 | 27deebe8 | Frediano Ziglio | ret = -EIO; |
560 | 27deebe8 | Frediano Ziglio | goto done;
|
561 | 83f64091 | bellard | } |
562 | 83f64091 | bellard | |
563 | a968168c | Dong Xu Wang | static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, |
564 | 27deebe8 | Frediano Ziglio | int nb_sectors, QEMUIOVector *qiov)
|
565 | 83f64091 | bellard | { |
566 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
567 | 83f64091 | bellard | int index_in_cluster;
|
568 | 83f64091 | bellard | uint64_t cluster_offset; |
569 | 83f64091 | bellard | const uint8_t *src_buf;
|
570 | 27deebe8 | Frediano Ziglio | int ret = 0, n; |
571 | 430bbaaa | Frediano Ziglio | uint8_t *cluster_data = NULL;
|
572 | 430bbaaa | Frediano Ziglio | struct iovec hd_iov;
|
573 | 430bbaaa | Frediano Ziglio | QEMUIOVector hd_qiov; |
574 | 27deebe8 | Frediano Ziglio | uint8_t *buf; |
575 | 27deebe8 | Frediano Ziglio | void *orig_buf;
|
576 | ce1a14dc | pbrook | |
577 | 27deebe8 | Frediano Ziglio | s->cluster_cache_offset = -1; /* disable compressed cache */ |
578 | 3b46e624 | ths | |
579 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
580 | 27deebe8 | Frediano Ziglio | buf = orig_buf = qemu_blockalign(bs, qiov->size); |
581 | d5e6b161 | Michael Tokarev | qemu_iovec_to_buf(qiov, 0, buf, qiov->size);
|
582 | 83f64091 | bellard | } else {
|
583 | 27deebe8 | Frediano Ziglio | orig_buf = NULL;
|
584 | 27deebe8 | Frediano Ziglio | buf = (uint8_t *)qiov->iov->iov_base; |
585 | 83f64091 | bellard | } |
586 | c87c0672 | aliguori | |
587 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_lock(&s->lock); |
588 | 43ca85b5 | Frediano Ziglio | |
589 | 27deebe8 | Frediano Ziglio | while (nb_sectors != 0) { |
590 | 83f64091 | bellard | |
591 | 27deebe8 | Frediano Ziglio | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
592 | 27deebe8 | Frediano Ziglio | n = s->cluster_sectors - index_in_cluster; |
593 | 27deebe8 | Frediano Ziglio | if (n > nb_sectors) {
|
594 | 27deebe8 | Frediano Ziglio | n = nb_sectors; |
595 | 27deebe8 | Frediano Ziglio | } |
596 | 27deebe8 | Frediano Ziglio | cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0, |
597 | 27deebe8 | Frediano Ziglio | index_in_cluster, |
598 | 27deebe8 | Frediano Ziglio | index_in_cluster + n); |
599 | 27deebe8 | Frediano Ziglio | if (!cluster_offset || (cluster_offset & 511) != 0) { |
600 | 27deebe8 | Frediano Ziglio | ret = -EIO; |
601 | 27deebe8 | Frediano Ziglio | break;
|
602 | 27deebe8 | Frediano Ziglio | } |
603 | 27deebe8 | Frediano Ziglio | if (s->crypt_method) {
|
604 | 27deebe8 | Frediano Ziglio | if (!cluster_data) {
|
605 | 27deebe8 | Frediano Ziglio | cluster_data = g_malloc0(s->cluster_size); |
606 | 27deebe8 | Frediano Ziglio | } |
607 | 27deebe8 | Frediano Ziglio | encrypt_sectors(s, sector_num, cluster_data, buf, |
608 | 27deebe8 | Frediano Ziglio | n, 1, &s->aes_encrypt_key);
|
609 | 27deebe8 | Frediano Ziglio | src_buf = cluster_data; |
610 | 27deebe8 | Frediano Ziglio | } else {
|
611 | 27deebe8 | Frediano Ziglio | src_buf = buf; |
612 | 27deebe8 | Frediano Ziglio | } |
613 | 83f64091 | bellard | |
614 | 27deebe8 | Frediano Ziglio | hd_iov.iov_base = (void *)src_buf;
|
615 | 27deebe8 | Frediano Ziglio | hd_iov.iov_len = n * 512;
|
616 | 27deebe8 | Frediano Ziglio | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
|
617 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
618 | 27deebe8 | Frediano Ziglio | ret = bdrv_co_writev(bs->file, |
619 | 27deebe8 | Frediano Ziglio | (cluster_offset >> 9) + index_in_cluster,
|
620 | 27deebe8 | Frediano Ziglio | n, &hd_qiov); |
621 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
622 | 27deebe8 | Frediano Ziglio | if (ret < 0) { |
623 | 27deebe8 | Frediano Ziglio | break;
|
624 | 27deebe8 | Frediano Ziglio | } |
625 | 27deebe8 | Frediano Ziglio | ret = 0;
|
626 | ad53089b | Christoph Hellwig | |
627 | 27deebe8 | Frediano Ziglio | nb_sectors -= n; |
628 | 27deebe8 | Frediano Ziglio | sector_num += n; |
629 | 27deebe8 | Frediano Ziglio | buf += n * 512;
|
630 | 27deebe8 | Frediano Ziglio | } |
631 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
632 | 3b46e624 | ths | |
633 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
634 | 27deebe8 | Frediano Ziglio | qemu_vfree(orig_buf); |
635 | b11a24de | Kevin Wolf | } |
636 | add8d262 | Stefan Weil | g_free(cluster_data); |
637 | b11a24de | Kevin Wolf | |
638 | 52b8eb60 | Kevin Wolf | return ret;
|
639 | 83f64091 | bellard | } |
640 | 83f64091 | bellard | |
641 | e2731add | bellard | static void qcow_close(BlockDriverState *bs) |
642 | ea2384d3 | bellard | { |
643 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
644 | fd9f102c | Kevin Wolf | |
645 | 7267c094 | Anthony Liguori | g_free(s->l1_table); |
646 | 7267c094 | Anthony Liguori | g_free(s->l2_cache); |
647 | 7267c094 | Anthony Liguori | g_free(s->cluster_cache); |
648 | 7267c094 | Anthony Liguori | g_free(s->cluster_data); |
649 | fd9f102c | Kevin Wolf | |
650 | fd9f102c | Kevin Wolf | migrate_del_blocker(s->migration_blocker); |
651 | fd9f102c | Kevin Wolf | error_free(s->migration_blocker); |
652 | ea2384d3 | bellard | } |
653 | ea2384d3 | bellard | |
654 | 0e7e1989 | Kevin Wolf | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
655 | ea2384d3 | bellard | { |
656 | 2b16c9ff | Li Zhi Hui | int header_size, backing_filename_len, l1_size, shift, i;
|
657 | ea2384d3 | bellard | QCowHeader header; |
658 | 2b16c9ff | Li Zhi Hui | uint8_t *tmp; |
659 | 0e7e1989 | Kevin Wolf | int64_t total_size = 0;
|
660 | 0e7e1989 | Kevin Wolf | const char *backing_file = NULL; |
661 | 0e7e1989 | Kevin Wolf | int flags = 0; |
662 | 3e1a8134 | Kirill A. Shutemov | int ret;
|
663 | 2b16c9ff | Li Zhi Hui | BlockDriverState *qcow_bs; |
664 | 0e7e1989 | Kevin Wolf | |
665 | 0e7e1989 | Kevin Wolf | /* Read out options */
|
666 | 0e7e1989 | Kevin Wolf | while (options && options->name) {
|
667 | 0e7e1989 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
668 | 0e7e1989 | Kevin Wolf | total_size = options->value.n / 512;
|
669 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
670 | 0e7e1989 | Kevin Wolf | backing_file = options->value.s; |
671 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
672 | 0e7e1989 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
673 | 0e7e1989 | Kevin Wolf | } |
674 | 0e7e1989 | Kevin Wolf | options++; |
675 | 0e7e1989 | Kevin Wolf | } |
676 | ea2384d3 | bellard | |
677 | 2b16c9ff | Li Zhi Hui | ret = bdrv_create_file(filename, options); |
678 | 2b16c9ff | Li Zhi Hui | if (ret < 0) { |
679 | 2b16c9ff | Li Zhi Hui | return ret;
|
680 | 2b16c9ff | Li Zhi Hui | } |
681 | 2b16c9ff | Li Zhi Hui | |
682 | 2b16c9ff | Li Zhi Hui | ret = bdrv_file_open(&qcow_bs, filename, BDRV_O_RDWR); |
683 | 2b16c9ff | Li Zhi Hui | if (ret < 0) { |
684 | 2b16c9ff | Li Zhi Hui | return ret;
|
685 | 2b16c9ff | Li Zhi Hui | } |
686 | 2b16c9ff | Li Zhi Hui | |
687 | 2b16c9ff | Li Zhi Hui | ret = bdrv_truncate(qcow_bs, 0);
|
688 | 2b16c9ff | Li Zhi Hui | if (ret < 0) { |
689 | 2b16c9ff | Li Zhi Hui | goto exit;
|
690 | 2b16c9ff | Li Zhi Hui | } |
691 | 2b16c9ff | Li Zhi Hui | |
692 | ea2384d3 | bellard | memset(&header, 0, sizeof(header)); |
693 | ea2384d3 | bellard | header.magic = cpu_to_be32(QCOW_MAGIC); |
694 | ea2384d3 | bellard | header.version = cpu_to_be32(QCOW_VERSION); |
695 | ea2384d3 | bellard | header.size = cpu_to_be64(total_size * 512);
|
696 | ea2384d3 | bellard | header_size = sizeof(header);
|
697 | ea2384d3 | bellard | backing_filename_len = 0;
|
698 | ea2384d3 | bellard | if (backing_file) {
|
699 | 7852e5da | aurel32 | if (strcmp(backing_file, "fat:")) { |
700 | 7852e5da | aurel32 | header.backing_file_offset = cpu_to_be64(header_size); |
701 | 7852e5da | aurel32 | backing_filename_len = strlen(backing_file); |
702 | 7852e5da | aurel32 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
703 | 7852e5da | aurel32 | header_size += backing_filename_len; |
704 | 7852e5da | aurel32 | } else {
|
705 | 7852e5da | aurel32 | /* special backing file for vvfat */
|
706 | 7852e5da | aurel32 | backing_file = NULL;
|
707 | 7852e5da | aurel32 | } |
708 | ea2384d3 | bellard | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
709 | ea2384d3 | bellard | unmodifyed sectors */
|
710 | ea2384d3 | bellard | header.l2_bits = 12; /* 32 KB L2 tables */ |
711 | ea2384d3 | bellard | } else {
|
712 | ea2384d3 | bellard | header.cluster_bits = 12; /* 4 KB clusters */ |
713 | ea2384d3 | bellard | header.l2_bits = 9; /* 4 KB L2 tables */ |
714 | ea2384d3 | bellard | } |
715 | ea2384d3 | bellard | header_size = (header_size + 7) & ~7; |
716 | ea2384d3 | bellard | shift = header.cluster_bits + header.l2_bits; |
717 | ea2384d3 | bellard | l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift; |
718 | ea2384d3 | bellard | |
719 | ea2384d3 | bellard | header.l1_table_offset = cpu_to_be64(header_size); |
720 | ec36ba14 | ths | if (flags & BLOCK_FLAG_ENCRYPT) {
|
721 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
722 | ea2384d3 | bellard | } else {
|
723 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
724 | ea2384d3 | bellard | } |
725 | 3b46e624 | ths | |
726 | ea2384d3 | bellard | /* write all the data */
|
727 | 2b16c9ff | Li Zhi Hui | ret = bdrv_pwrite(qcow_bs, 0, &header, sizeof(header)); |
728 | 3e1a8134 | Kirill A. Shutemov | if (ret != sizeof(header)) { |
729 | 3e1a8134 | Kirill A. Shutemov | goto exit;
|
730 | 3e1a8134 | Kirill A. Shutemov | } |
731 | 3e1a8134 | Kirill A. Shutemov | |
732 | ea2384d3 | bellard | if (backing_file) {
|
733 | 2b16c9ff | Li Zhi Hui | ret = bdrv_pwrite(qcow_bs, sizeof(header),
|
734 | 2b16c9ff | Li Zhi Hui | backing_file, backing_filename_len); |
735 | 3e1a8134 | Kirill A. Shutemov | if (ret != backing_filename_len) {
|
736 | 3e1a8134 | Kirill A. Shutemov | goto exit;
|
737 | 3e1a8134 | Kirill A. Shutemov | } |
738 | ea2384d3 | bellard | } |
739 | 2b16c9ff | Li Zhi Hui | |
740 | 2b16c9ff | Li Zhi Hui | tmp = g_malloc0(BDRV_SECTOR_SIZE); |
741 | 2b16c9ff | Li Zhi Hui | for (i = 0; i < ((sizeof(uint64_t)*l1_size + BDRV_SECTOR_SIZE - 1)/ |
742 | 2b16c9ff | Li Zhi Hui | BDRV_SECTOR_SIZE); i++) { |
743 | 2b16c9ff | Li Zhi Hui | ret = bdrv_pwrite(qcow_bs, header_size + |
744 | 2b16c9ff | Li Zhi Hui | BDRV_SECTOR_SIZE*i, tmp, BDRV_SECTOR_SIZE); |
745 | 2b16c9ff | Li Zhi Hui | if (ret != BDRV_SECTOR_SIZE) {
|
746 | 2b16c9ff | Li Zhi Hui | g_free(tmp); |
747 | 3e1a8134 | Kirill A. Shutemov | goto exit;
|
748 | 3e1a8134 | Kirill A. Shutemov | } |
749 | ea2384d3 | bellard | } |
750 | 3e1a8134 | Kirill A. Shutemov | |
751 | 2b16c9ff | Li Zhi Hui | g_free(tmp); |
752 | 3e1a8134 | Kirill A. Shutemov | ret = 0;
|
753 | 3e1a8134 | Kirill A. Shutemov | exit:
|
754 | 2b16c9ff | Li Zhi Hui | bdrv_delete(qcow_bs); |
755 | 3e1a8134 | Kirill A. Shutemov | return ret;
|
756 | ea2384d3 | bellard | } |
757 | ea2384d3 | bellard | |
758 | c47c33b0 | bellard | static int qcow_make_empty(BlockDriverState *bs) |
759 | 95389c86 | bellard | { |
760 | 95389c86 | bellard | BDRVQcowState *s = bs->opaque; |
761 | 95389c86 | bellard | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
762 | 83f64091 | bellard | int ret;
|
763 | 95389c86 | bellard | |
764 | 95389c86 | bellard | memset(s->l1_table, 0, l1_length);
|
765 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table,
|
766 | 5e5557d9 | Kevin Wolf | l1_length) < 0)
|
767 | 5e5557d9 | Kevin Wolf | return -1; |
768 | 66f82cee | Kevin Wolf | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
769 | 83f64091 | bellard | if (ret < 0) |
770 | 83f64091 | bellard | return ret;
|
771 | 95389c86 | bellard | |
772 | 95389c86 | bellard | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
773 | 95389c86 | bellard | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); |
774 | 95389c86 | bellard | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); |
775 | 95389c86 | bellard | |
776 | 95389c86 | bellard | return 0; |
777 | 95389c86 | bellard | } |
778 | 95389c86 | bellard | |
779 | ea2384d3 | bellard | /* XXX: put compressed sectors first, then all the cluster aligned
|
780 | ea2384d3 | bellard | tables to avoid losing bytes in alignment */
|
781 | 5fafdf24 | ths | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
782 | c47c33b0 | bellard | const uint8_t *buf, int nb_sectors) |
783 | ea2384d3 | bellard | { |
784 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
785 | ea2384d3 | bellard | z_stream strm; |
786 | ea2384d3 | bellard | int ret, out_len;
|
787 | ea2384d3 | bellard | uint8_t *out_buf; |
788 | ea2384d3 | bellard | uint64_t cluster_offset; |
789 | ea2384d3 | bellard | |
790 | c47c33b0 | bellard | if (nb_sectors != s->cluster_sectors)
|
791 | c47c33b0 | bellard | return -EINVAL;
|
792 | ea2384d3 | bellard | |
793 | 7267c094 | Anthony Liguori | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
794 | ea2384d3 | bellard | |
795 | ea2384d3 | bellard | /* best compression, small window, no zlib header */
|
796 | ea2384d3 | bellard | memset(&strm, 0, sizeof(strm)); |
797 | ea2384d3 | bellard | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
798 | 5fafdf24 | ths | Z_DEFLATED, -12,
|
799 | ea2384d3 | bellard | 9, Z_DEFAULT_STRATEGY);
|
800 | ea2384d3 | bellard | if (ret != 0) { |
801 | 64ebe71a | Kevin Wolf | ret = -EINVAL; |
802 | 64ebe71a | Kevin Wolf | goto fail;
|
803 | ea2384d3 | bellard | } |
804 | ea2384d3 | bellard | |
805 | ea2384d3 | bellard | strm.avail_in = s->cluster_size; |
806 | ea2384d3 | bellard | strm.next_in = (uint8_t *)buf; |
807 | ea2384d3 | bellard | strm.avail_out = s->cluster_size; |
808 | ea2384d3 | bellard | strm.next_out = out_buf; |
809 | ea2384d3 | bellard | |
810 | ea2384d3 | bellard | ret = deflate(&strm, Z_FINISH); |
811 | ea2384d3 | bellard | if (ret != Z_STREAM_END && ret != Z_OK) {
|
812 | ea2384d3 | bellard | deflateEnd(&strm); |
813 | 64ebe71a | Kevin Wolf | ret = -EINVAL; |
814 | 64ebe71a | Kevin Wolf | goto fail;
|
815 | ea2384d3 | bellard | } |
816 | ea2384d3 | bellard | out_len = strm.next_out - out_buf; |
817 | ea2384d3 | bellard | |
818 | ea2384d3 | bellard | deflateEnd(&strm); |
819 | ea2384d3 | bellard | |
820 | ea2384d3 | bellard | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
821 | ea2384d3 | bellard | /* could not compress: write normal cluster */
|
822 | 64ebe71a | Kevin Wolf | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
823 | 64ebe71a | Kevin Wolf | if (ret < 0) { |
824 | 64ebe71a | Kevin Wolf | goto fail;
|
825 | 64ebe71a | Kevin Wolf | } |
826 | ea2384d3 | bellard | } else {
|
827 | 5fafdf24 | ths | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
828 | ea2384d3 | bellard | out_len, 0, 0); |
829 | 64ebe71a | Kevin Wolf | if (cluster_offset == 0) { |
830 | 64ebe71a | Kevin Wolf | ret = -EIO; |
831 | 64ebe71a | Kevin Wolf | goto fail;
|
832 | 64ebe71a | Kevin Wolf | } |
833 | 64ebe71a | Kevin Wolf | |
834 | ea2384d3 | bellard | cluster_offset &= s->cluster_offset_mask; |
835 | 64ebe71a | Kevin Wolf | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
836 | 64ebe71a | Kevin Wolf | if (ret < 0) { |
837 | 64ebe71a | Kevin Wolf | goto fail;
|
838 | ea2384d3 | bellard | } |
839 | ea2384d3 | bellard | } |
840 | 3b46e624 | ths | |
841 | 64ebe71a | Kevin Wolf | ret = 0;
|
842 | 64ebe71a | Kevin Wolf | fail:
|
843 | 7267c094 | Anthony Liguori | g_free(out_buf); |
844 | 64ebe71a | Kevin Wolf | return ret;
|
845 | ea2384d3 | bellard | } |
846 | ea2384d3 | bellard | |
847 | c47c33b0 | bellard | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
848 | c47c33b0 | bellard | { |
849 | c47c33b0 | bellard | BDRVQcowState *s = bs->opaque; |
850 | c47c33b0 | bellard | bdi->cluster_size = s->cluster_size; |
851 | c47c33b0 | bellard | return 0; |
852 | c47c33b0 | bellard | } |
853 | c47c33b0 | bellard | |
854 | 0e7e1989 | Kevin Wolf | |
855 | 0e7e1989 | Kevin Wolf | static QEMUOptionParameter qcow_create_options[] = {
|
856 | db08adf5 | Kevin Wolf | { |
857 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_SIZE, |
858 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
859 | db08adf5 | Kevin Wolf | .help = "Virtual disk size"
|
860 | db08adf5 | Kevin Wolf | }, |
861 | db08adf5 | Kevin Wolf | { |
862 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FILE, |
863 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
864 | db08adf5 | Kevin Wolf | .help = "File name of a base image"
|
865 | db08adf5 | Kevin Wolf | }, |
866 | db08adf5 | Kevin Wolf | { |
867 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_ENCRYPT, |
868 | db08adf5 | Kevin Wolf | .type = OPT_FLAG, |
869 | db08adf5 | Kevin Wolf | .help = "Encrypt the image"
|
870 | db08adf5 | Kevin Wolf | }, |
871 | 0e7e1989 | Kevin Wolf | { NULL }
|
872 | 0e7e1989 | Kevin Wolf | }; |
873 | 0e7e1989 | Kevin Wolf | |
874 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_qcow = {
|
875 | e60f469c | aurel32 | .format_name = "qcow",
|
876 | e60f469c | aurel32 | .instance_size = sizeof(BDRVQcowState),
|
877 | e60f469c | aurel32 | .bdrv_probe = qcow_probe, |
878 | e60f469c | aurel32 | .bdrv_open = qcow_open, |
879 | e60f469c | aurel32 | .bdrv_close = qcow_close, |
880 | d177692e | Jeff Cody | .bdrv_reopen_prepare = qcow_reopen_prepare, |
881 | e60f469c | aurel32 | .bdrv_create = qcow_create, |
882 | c68b89ac | Kevin Wolf | |
883 | c68b89ac | Kevin Wolf | .bdrv_co_readv = qcow_co_readv, |
884 | c68b89ac | Kevin Wolf | .bdrv_co_writev = qcow_co_writev, |
885 | f8a2e5e3 | Stefan Hajnoczi | .bdrv_co_is_allocated = qcow_co_is_allocated, |
886 | c68b89ac | Kevin Wolf | |
887 | c68b89ac | Kevin Wolf | .bdrv_set_key = qcow_set_key, |
888 | c68b89ac | Kevin Wolf | .bdrv_make_empty = qcow_make_empty, |
889 | c68b89ac | Kevin Wolf | .bdrv_write_compressed = qcow_write_compressed, |
890 | c68b89ac | Kevin Wolf | .bdrv_get_info = qcow_get_info, |
891 | 0e7e1989 | Kevin Wolf | |
892 | 0e7e1989 | Kevin Wolf | .create_options = qcow_create_options, |
893 | ea2384d3 | bellard | }; |
894 | 5efa9d5a | Anthony Liguori | |
895 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow_init(void) |
896 | 5efa9d5a | Anthony Liguori | { |
897 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow); |
898 | 5efa9d5a | Anthony Liguori | } |
899 | 5efa9d5a | Anthony Liguori | |
900 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow_init); |