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Commit | Line | Data |
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ea2384d3 FB |
1 | /* |
2 | * Block driver for the QCOW format | |
5fafdf24 | 3 | * |
83f64091 | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5fafdf24 | 5 | * |
ea2384d3 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
737e150e | 25 | #include "block/block_int.h" |
1de7afc9 | 26 | #include "qemu/module.h" |
28d34b82 | 27 | #include <zlib.h> |
753d9b82 | 28 | #include "qemu/aes.h" |
caf71f86 | 29 | #include "migration/migration.h" |
ea2384d3 FB |
30 | |
31 | /**************************************************************/ | |
32 | /* QEMU COW block driver with compression and encryption support */ | |
33 | ||
34 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) | |
35 | #define QCOW_VERSION 1 | |
36 | ||
37 | #define QCOW_CRYPT_NONE 0 | |
38 | #define QCOW_CRYPT_AES 1 | |
39 | ||
40 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) | |
41 | ||
42 | typedef struct QCowHeader { | |
43 | uint32_t magic; | |
44 | uint32_t version; | |
45 | uint64_t backing_file_offset; | |
46 | uint32_t backing_file_size; | |
47 | uint32_t mtime; | |
48 | uint64_t size; /* in bytes */ | |
49 | uint8_t cluster_bits; | |
50 | uint8_t l2_bits; | |
ea54feff | 51 | uint16_t padding; |
ea2384d3 FB |
52 | uint32_t crypt_method; |
53 | uint64_t l1_table_offset; | |
ea54feff | 54 | } QEMU_PACKED QCowHeader; |
ea2384d3 FB |
55 | |
56 | #define L2_CACHE_SIZE 16 | |
57 | ||
58 | typedef struct BDRVQcowState { | |
ea2384d3 FB |
59 | int cluster_bits; |
60 | int cluster_size; | |
61 | int cluster_sectors; | |
62 | int l2_bits; | |
63 | int l2_size; | |
46485de0 | 64 | unsigned int l1_size; |
ea2384d3 FB |
65 | uint64_t cluster_offset_mask; |
66 | uint64_t l1_table_offset; | |
67 | uint64_t *l1_table; | |
68 | uint64_t *l2_cache; | |
69 | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; | |
70 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
71 | uint8_t *cluster_cache; | |
72 | uint8_t *cluster_data; | |
73 | uint64_t cluster_cache_offset; | |
74 | uint32_t crypt_method; /* current crypt method, 0 if no key yet */ | |
75 | uint32_t crypt_method_header; | |
76 | AES_KEY aes_encrypt_key; | |
77 | AES_KEY aes_decrypt_key; | |
52b8eb60 | 78 | CoMutex lock; |
fd9f102c | 79 | Error *migration_blocker; |
ea2384d3 FB |
80 | } BDRVQcowState; |
81 | ||
66f82cee | 82 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
ea2384d3 FB |
83 | |
84 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) | |
85 | { | |
86 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 87 | |
712e7874 FB |
88 | if (buf_size >= sizeof(QCowHeader) && |
89 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
5fafdf24 | 90 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
ea2384d3 FB |
91 | return 100; |
92 | else | |
93 | return 0; | |
94 | } | |
95 | ||
015a1036 HR |
96 | static int qcow_open(BlockDriverState *bs, QDict *options, int flags, |
97 | Error **errp) | |
ea2384d3 FB |
98 | { |
99 | BDRVQcowState *s = bs->opaque; | |
d66e5cee KW |
100 | unsigned int len, i, shift; |
101 | int ret; | |
ea2384d3 | 102 | QCowHeader header; |
83f64091 | 103 | |
84b0ec02 LZH |
104 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
105 | if (ret < 0) { | |
ea2384d3 | 106 | goto fail; |
84b0ec02 | 107 | } |
ea2384d3 FB |
108 | be32_to_cpus(&header.magic); |
109 | be32_to_cpus(&header.version); | |
110 | be64_to_cpus(&header.backing_file_offset); | |
111 | be32_to_cpus(&header.backing_file_size); | |
112 | be32_to_cpus(&header.mtime); | |
113 | be64_to_cpus(&header.size); | |
114 | be32_to_cpus(&header.crypt_method); | |
115 | be64_to_cpus(&header.l1_table_offset); | |
3b46e624 | 116 | |
84b0ec02 | 117 | if (header.magic != QCOW_MAGIC) { |
76abe407 PB |
118 | error_setg(errp, "Image not in qcow format"); |
119 | ret = -EINVAL; | |
84b0ec02 LZH |
120 | goto fail; |
121 | } | |
122 | if (header.version != QCOW_VERSION) { | |
123 | char version[64]; | |
521b2b5d HR |
124 | snprintf(version, sizeof(version), "QCOW version %" PRIu32, |
125 | header.version); | |
b6d5066d PB |
126 | error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
127 | bs->device_name, "qcow", version); | |
84b0ec02 | 128 | ret = -ENOTSUP; |
ea2384d3 | 129 | goto fail; |
84b0ec02 LZH |
130 | } |
131 | ||
7159a45b KW |
132 | if (header.size <= 1) { |
133 | error_setg(errp, "Image size is too small (must be at least 2 bytes)"); | |
84b0ec02 | 134 | ret = -EINVAL; |
ea2384d3 | 135 | goto fail; |
84b0ec02 | 136 | } |
7159a45b KW |
137 | if (header.cluster_bits < 9 || header.cluster_bits > 16) { |
138 | error_setg(errp, "Cluster size must be between 512 and 64k"); | |
139 | ret = -EINVAL; | |
140 | goto fail; | |
141 | } | |
142 | ||
42eb5817 KW |
143 | /* l2_bits specifies number of entries; storing a uint64_t in each entry, |
144 | * so bytes = num_entries << 3. */ | |
145 | if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) { | |
146 | error_setg(errp, "L2 table size must be between 512 and 64k"); | |
147 | ret = -EINVAL; | |
148 | goto fail; | |
149 | } | |
150 | ||
84b0ec02 | 151 | if (header.crypt_method > QCOW_CRYPT_AES) { |
b6d5066d | 152 | error_setg(errp, "invalid encryption method in qcow header"); |
84b0ec02 | 153 | ret = -EINVAL; |
ea2384d3 | 154 | goto fail; |
84b0ec02 | 155 | } |
ea2384d3 | 156 | s->crypt_method_header = header.crypt_method; |
84b0ec02 | 157 | if (s->crypt_method_header) { |
ea2384d3 | 158 | bs->encrypted = 1; |
84b0ec02 | 159 | } |
ea2384d3 FB |
160 | s->cluster_bits = header.cluster_bits; |
161 | s->cluster_size = 1 << s->cluster_bits; | |
162 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
163 | s->l2_bits = header.l2_bits; | |
164 | s->l2_size = 1 << s->l2_bits; | |
165 | bs->total_sectors = header.size / 512; | |
166 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; | |
167 | ||
168 | /* read the level 1 table */ | |
169 | shift = s->cluster_bits + s->l2_bits; | |
46485de0 KW |
170 | if (header.size > UINT64_MAX - (1LL << shift)) { |
171 | error_setg(errp, "Image too large"); | |
172 | ret = -EINVAL; | |
173 | goto fail; | |
174 | } else { | |
175 | uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; | |
176 | if (l1_size > INT_MAX / sizeof(uint64_t)) { | |
177 | error_setg(errp, "Image too large"); | |
178 | ret = -EINVAL; | |
179 | goto fail; | |
180 | } | |
181 | s->l1_size = l1_size; | |
182 | } | |
ea2384d3 FB |
183 | |
184 | s->l1_table_offset = header.l1_table_offset; | |
7267c094 | 185 | s->l1_table = g_malloc(s->l1_size * sizeof(uint64_t)); |
84b0ec02 LZH |
186 | |
187 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, | |
188 | s->l1_size * sizeof(uint64_t)); | |
189 | if (ret < 0) { | |
ea2384d3 | 190 | goto fail; |
84b0ec02 LZH |
191 | } |
192 | ||
ea2384d3 FB |
193 | for(i = 0;i < s->l1_size; i++) { |
194 | be64_to_cpus(&s->l1_table[i]); | |
195 | } | |
196 | /* alloc L2 cache */ | |
7267c094 | 197 | s->l2_cache = g_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
7267c094 | 198 | s->cluster_cache = g_malloc(s->cluster_size); |
7267c094 | 199 | s->cluster_data = g_malloc(s->cluster_size); |
ea2384d3 | 200 | s->cluster_cache_offset = -1; |
3b46e624 | 201 | |
ea2384d3 FB |
202 | /* read the backing file name */ |
203 | if (header.backing_file_offset != 0) { | |
204 | len = header.backing_file_size; | |
84b0ec02 | 205 | if (len > 1023) { |
d66e5cee KW |
206 | error_setg(errp, "Backing file name too long"); |
207 | ret = -EINVAL; | |
208 | goto fail; | |
84b0ec02 LZH |
209 | } |
210 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
211 | bs->backing_file, len); | |
212 | if (ret < 0) { | |
ea2384d3 | 213 | goto fail; |
84b0ec02 | 214 | } |
ea2384d3 FB |
215 | bs->backing_file[len] = '\0'; |
216 | } | |
de33b1f3 | 217 | |
fd9f102c KW |
218 | /* Disable migration when qcow images are used */ |
219 | error_set(&s->migration_blocker, | |
220 | QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
221 | "qcow", bs->device_name, "live migration"); | |
222 | migrate_add_blocker(s->migration_blocker); | |
223 | ||
de33b1f3 | 224 | qemu_co_mutex_init(&s->lock); |
ea2384d3 FB |
225 | return 0; |
226 | ||
227 | fail: | |
7267c094 AL |
228 | g_free(s->l1_table); |
229 | g_free(s->l2_cache); | |
230 | g_free(s->cluster_cache); | |
231 | g_free(s->cluster_data); | |
84b0ec02 | 232 | return ret; |
ea2384d3 FB |
233 | } |
234 | ||
d177692e JC |
235 | |
236 | /* We have nothing to do for QCOW reopen, stubs just return | |
237 | * success */ | |
238 | static int qcow_reopen_prepare(BDRVReopenState *state, | |
239 | BlockReopenQueue *queue, Error **errp) | |
240 | { | |
241 | return 0; | |
242 | } | |
243 | ||
ea2384d3 FB |
244 | static int qcow_set_key(BlockDriverState *bs, const char *key) |
245 | { | |
246 | BDRVQcowState *s = bs->opaque; | |
247 | uint8_t keybuf[16]; | |
248 | int len, i; | |
3b46e624 | 249 | |
ea2384d3 FB |
250 | memset(keybuf, 0, 16); |
251 | len = strlen(key); | |
252 | if (len > 16) | |
253 | len = 16; | |
254 | /* XXX: we could compress the chars to 7 bits to increase | |
255 | entropy */ | |
256 | for(i = 0;i < len;i++) { | |
257 | keybuf[i] = key[i]; | |
258 | } | |
259 | s->crypt_method = s->crypt_method_header; | |
260 | ||
261 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
262 | return -1; | |
263 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
264 | return -1; | |
ea2384d3 FB |
265 | return 0; |
266 | } | |
267 | ||
268 | /* The crypt function is compatible with the linux cryptoloop | |
269 | algorithm for < 4 GB images. NOTE: out_buf == in_buf is | |
270 | supported */ | |
271 | static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num, | |
272 | uint8_t *out_buf, const uint8_t *in_buf, | |
273 | int nb_sectors, int enc, | |
274 | const AES_KEY *key) | |
275 | { | |
276 | union { | |
277 | uint64_t ll[2]; | |
278 | uint8_t b[16]; | |
279 | } ivec; | |
280 | int i; | |
281 | ||
282 | for(i = 0; i < nb_sectors; i++) { | |
283 | ivec.ll[0] = cpu_to_le64(sector_num); | |
284 | ivec.ll[1] = 0; | |
5fafdf24 | 285 | AES_cbc_encrypt(in_buf, out_buf, 512, key, |
ea2384d3 FB |
286 | ivec.b, enc); |
287 | sector_num++; | |
288 | in_buf += 512; | |
289 | out_buf += 512; | |
290 | } | |
291 | } | |
292 | ||
293 | /* 'allocate' is: | |
294 | * | |
295 | * 0 to not allocate. | |
296 | * | |
297 | * 1 to allocate a normal cluster (for sector indexes 'n_start' to | |
298 | * 'n_end') | |
299 | * | |
300 | * 2 to allocate a compressed cluster of size | |
301 | * 'compressed_size'. 'compressed_size' must be > 0 and < | |
5fafdf24 | 302 | * cluster_size |
ea2384d3 FB |
303 | * |
304 | * return 0 if not allocated. | |
305 | */ | |
306 | static uint64_t get_cluster_offset(BlockDriverState *bs, | |
307 | uint64_t offset, int allocate, | |
308 | int compressed_size, | |
309 | int n_start, int n_end) | |
310 | { | |
311 | BDRVQcowState *s = bs->opaque; | |
312 | int min_index, i, j, l1_index, l2_index; | |
313 | uint64_t l2_offset, *l2_table, cluster_offset, tmp; | |
314 | uint32_t min_count; | |
315 | int new_l2_table; | |
3b46e624 | 316 | |
ea2384d3 FB |
317 | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
318 | l2_offset = s->l1_table[l1_index]; | |
319 | new_l2_table = 0; | |
320 | if (!l2_offset) { | |
321 | if (!allocate) | |
322 | return 0; | |
323 | /* allocate a new l2 entry */ | |
66f82cee | 324 | l2_offset = bdrv_getlength(bs->file); |
ea2384d3 FB |
325 | /* round to cluster size */ |
326 | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); | |
327 | /* update the L1 entry */ | |
328 | s->l1_table[l1_index] = l2_offset; | |
329 | tmp = cpu_to_be64(l2_offset); | |
5e5557d9 KW |
330 | if (bdrv_pwrite_sync(bs->file, |
331 | s->l1_table_offset + l1_index * sizeof(tmp), | |
332 | &tmp, sizeof(tmp)) < 0) | |
ea2384d3 FB |
333 | return 0; |
334 | new_l2_table = 1; | |
335 | } | |
336 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
337 | if (l2_offset == s->l2_cache_offsets[i]) { | |
338 | /* increment the hit count */ | |
339 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
340 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
341 | s->l2_cache_counts[j] >>= 1; | |
342 | } | |
343 | } | |
344 | l2_table = s->l2_cache + (i << s->l2_bits); | |
345 | goto found; | |
346 | } | |
347 | } | |
348 | /* not found: load a new entry in the least used one */ | |
349 | min_index = 0; | |
350 | min_count = 0xffffffff; | |
351 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
352 | if (s->l2_cache_counts[i] < min_count) { | |
353 | min_count = s->l2_cache_counts[i]; | |
354 | min_index = i; | |
355 | } | |
356 | } | |
357 | l2_table = s->l2_cache + (min_index << s->l2_bits); | |
ea2384d3 FB |
358 | if (new_l2_table) { |
359 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); | |
5e5557d9 KW |
360 | if (bdrv_pwrite_sync(bs->file, l2_offset, l2_table, |
361 | s->l2_size * sizeof(uint64_t)) < 0) | |
ea2384d3 FB |
362 | return 0; |
363 | } else { | |
66f82cee | 364 | if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != |
ea2384d3 FB |
365 | s->l2_size * sizeof(uint64_t)) |
366 | return 0; | |
367 | } | |
368 | s->l2_cache_offsets[min_index] = l2_offset; | |
369 | s->l2_cache_counts[min_index] = 1; | |
370 | found: | |
371 | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); | |
372 | cluster_offset = be64_to_cpu(l2_table[l2_index]); | |
5fafdf24 | 373 | if (!cluster_offset || |
ea2384d3 FB |
374 | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { |
375 | if (!allocate) | |
376 | return 0; | |
377 | /* allocate a new cluster */ | |
378 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && | |
379 | (n_end - n_start) < s->cluster_sectors) { | |
380 | /* if the cluster is already compressed, we must | |
381 | decompress it in the case it is not completely | |
382 | overwritten */ | |
66f82cee | 383 | if (decompress_cluster(bs, cluster_offset) < 0) |
ea2384d3 | 384 | return 0; |
66f82cee | 385 | cluster_offset = bdrv_getlength(bs->file); |
5fafdf24 | 386 | cluster_offset = (cluster_offset + s->cluster_size - 1) & |
ea2384d3 FB |
387 | ~(s->cluster_size - 1); |
388 | /* write the cluster content */ | |
66f82cee | 389 | if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, s->cluster_size) != |
ea2384d3 FB |
390 | s->cluster_size) |
391 | return -1; | |
392 | } else { | |
66f82cee | 393 | cluster_offset = bdrv_getlength(bs->file); |
7f48fa1f AL |
394 | if (allocate == 1) { |
395 | /* round to cluster size */ | |
396 | cluster_offset = (cluster_offset + s->cluster_size - 1) & | |
397 | ~(s->cluster_size - 1); | |
66f82cee | 398 | bdrv_truncate(bs->file, cluster_offset + s->cluster_size); |
7f48fa1f AL |
399 | /* if encrypted, we must initialize the cluster |
400 | content which won't be written */ | |
401 | if (s->crypt_method && | |
402 | (n_end - n_start) < s->cluster_sectors) { | |
403 | uint64_t start_sect; | |
404 | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; | |
405 | memset(s->cluster_data + 512, 0x00, 512); | |
406 | for(i = 0; i < s->cluster_sectors; i++) { | |
407 | if (i < n_start || i >= n_end) { | |
408 | encrypt_sectors(s, start_sect + i, | |
409 | s->cluster_data, | |
410 | s->cluster_data + 512, 1, 1, | |
411 | &s->aes_encrypt_key); | |
66f82cee | 412 | if (bdrv_pwrite(bs->file, cluster_offset + i * 512, |
7f48fa1f AL |
413 | s->cluster_data, 512) != 512) |
414 | return -1; | |
415 | } | |
ea2384d3 FB |
416 | } |
417 | } | |
7f48fa1f AL |
418 | } else if (allocate == 2) { |
419 | cluster_offset |= QCOW_OFLAG_COMPRESSED | | |
420 | (uint64_t)compressed_size << (63 - s->cluster_bits); | |
ea2384d3 FB |
421 | } |
422 | } | |
423 | /* update L2 table */ | |
424 | tmp = cpu_to_be64(cluster_offset); | |
425 | l2_table[l2_index] = tmp; | |
5e5557d9 KW |
426 | if (bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
427 | &tmp, sizeof(tmp)) < 0) | |
ea2384d3 FB |
428 | return 0; |
429 | } | |
430 | return cluster_offset; | |
431 | } | |
432 | ||
b6b8a333 | 433 | static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs, |
f8a2e5e3 | 434 | int64_t sector_num, int nb_sectors, int *pnum) |
ea2384d3 FB |
435 | { |
436 | BDRVQcowState *s = bs->opaque; | |
437 | int index_in_cluster, n; | |
438 | uint64_t cluster_offset; | |
439 | ||
f8a2e5e3 | 440 | qemu_co_mutex_lock(&s->lock); |
ea2384d3 | 441 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
f8a2e5e3 | 442 | qemu_co_mutex_unlock(&s->lock); |
ea2384d3 FB |
443 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
444 | n = s->cluster_sectors - index_in_cluster; | |
445 | if (n > nb_sectors) | |
446 | n = nb_sectors; | |
447 | *pnum = n; | |
4bc74be9 PB |
448 | if (!cluster_offset) { |
449 | return 0; | |
450 | } | |
451 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypt_method) { | |
452 | return BDRV_BLOCK_DATA; | |
453 | } | |
454 | cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); | |
455 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | cluster_offset; | |
ea2384d3 FB |
456 | } |
457 | ||
458 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, | |
459 | const uint8_t *buf, int buf_size) | |
460 | { | |
461 | z_stream strm1, *strm = &strm1; | |
462 | int ret, out_len; | |
463 | ||
464 | memset(strm, 0, sizeof(*strm)); | |
465 | ||
466 | strm->next_in = (uint8_t *)buf; | |
467 | strm->avail_in = buf_size; | |
468 | strm->next_out = out_buf; | |
469 | strm->avail_out = out_buf_size; | |
470 | ||
471 | ret = inflateInit2(strm, -12); | |
472 | if (ret != Z_OK) | |
473 | return -1; | |
474 | ret = inflate(strm, Z_FINISH); | |
475 | out_len = strm->next_out - out_buf; | |
476 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || | |
477 | out_len != out_buf_size) { | |
478 | inflateEnd(strm); | |
479 | return -1; | |
480 | } | |
481 | inflateEnd(strm); | |
482 | return 0; | |
483 | } | |
3b46e624 | 484 | |
66f82cee | 485 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
ea2384d3 | 486 | { |
66f82cee | 487 | BDRVQcowState *s = bs->opaque; |
ea2384d3 FB |
488 | int ret, csize; |
489 | uint64_t coffset; | |
490 | ||
491 | coffset = cluster_offset & s->cluster_offset_mask; | |
492 | if (s->cluster_cache_offset != coffset) { | |
493 | csize = cluster_offset >> (63 - s->cluster_bits); | |
494 | csize &= (s->cluster_size - 1); | |
66f82cee | 495 | ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize); |
5fafdf24 | 496 | if (ret != csize) |
ea2384d3 FB |
497 | return -1; |
498 | if (decompress_buffer(s->cluster_cache, s->cluster_size, | |
499 | s->cluster_data, csize) < 0) { | |
500 | return -1; | |
501 | } | |
502 | s->cluster_cache_offset = coffset; | |
503 | } | |
504 | return 0; | |
505 | } | |
506 | ||
a968168c | 507 | static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, |
27deebe8 | 508 | int nb_sectors, QEMUIOVector *qiov) |
83f64091 | 509 | { |
83f64091 | 510 | BDRVQcowState *s = bs->opaque; |
83f64091 | 511 | int index_in_cluster; |
27deebe8 | 512 | int ret = 0, n; |
43ca85b5 | 513 | uint64_t cluster_offset; |
430bbaaa FZ |
514 | struct iovec hd_iov; |
515 | QEMUIOVector hd_qiov; | |
27deebe8 FZ |
516 | uint8_t *buf; |
517 | void *orig_buf; | |
83f64091 | 518 | |
27deebe8 FZ |
519 | if (qiov->niov > 1) { |
520 | buf = orig_buf = qemu_blockalign(bs, qiov->size); | |
521 | } else { | |
522 | orig_buf = NULL; | |
523 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 524 | } |
3b46e624 | 525 | |
27deebe8 FZ |
526 | qemu_co_mutex_lock(&s->lock); |
527 | ||
528 | while (nb_sectors != 0) { | |
529 | /* prepare next request */ | |
530 | cluster_offset = get_cluster_offset(bs, sector_num << 9, | |
531 | 0, 0, 0, 0); | |
532 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
533 | n = s->cluster_sectors - index_in_cluster; | |
534 | if (n > nb_sectors) { | |
535 | n = nb_sectors; | |
536 | } | |
ce1a14dc | 537 | |
27deebe8 FZ |
538 | if (!cluster_offset) { |
539 | if (bs->backing_hd) { | |
540 | /* read from the base image */ | |
541 | hd_iov.iov_base = (void *)buf; | |
542 | hd_iov.iov_len = n * 512; | |
543 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); | |
544 | qemu_co_mutex_unlock(&s->lock); | |
545 | ret = bdrv_co_readv(bs->backing_hd, sector_num, | |
546 | n, &hd_qiov); | |
547 | qemu_co_mutex_lock(&s->lock); | |
548 | if (ret < 0) { | |
549 | goto fail; | |
550 | } | |
551 | } else { | |
552 | /* Note: in this case, no need to wait */ | |
553 | memset(buf, 0, 512 * n); | |
554 | } | |
555 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { | |
556 | /* add AIO support for compressed blocks ? */ | |
557 | if (decompress_cluster(bs, cluster_offset) < 0) { | |
558 | goto fail; | |
559 | } | |
560 | memcpy(buf, | |
561 | s->cluster_cache + index_in_cluster * 512, 512 * n); | |
562 | } else { | |
563 | if ((cluster_offset & 511) != 0) { | |
564 | goto fail; | |
565 | } | |
566 | hd_iov.iov_base = (void *)buf; | |
430bbaaa FZ |
567 | hd_iov.iov_len = n * 512; |
568 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); | |
52b8eb60 | 569 | qemu_co_mutex_unlock(&s->lock); |
27deebe8 FZ |
570 | ret = bdrv_co_readv(bs->file, |
571 | (cluster_offset >> 9) + index_in_cluster, | |
430bbaaa | 572 | n, &hd_qiov); |
52b8eb60 KW |
573 | qemu_co_mutex_lock(&s->lock); |
574 | if (ret < 0) { | |
27deebe8 FZ |
575 | break; |
576 | } | |
577 | if (s->crypt_method) { | |
578 | encrypt_sectors(s, sector_num, buf, buf, | |
579 | n, 0, | |
580 | &s->aes_decrypt_key); | |
5614c188 | 581 | } |
5614c188 | 582 | } |
27deebe8 | 583 | ret = 0; |
f141eafe | 584 | |
27deebe8 FZ |
585 | nb_sectors -= n; |
586 | sector_num += n; | |
587 | buf += n * 512; | |
43ca85b5 FZ |
588 | } |
589 | ||
27deebe8 | 590 | done: |
52b8eb60 KW |
591 | qemu_co_mutex_unlock(&s->lock); |
592 | ||
27deebe8 | 593 | if (qiov->niov > 1) { |
03396148 | 594 | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); |
27deebe8 | 595 | qemu_vfree(orig_buf); |
b11a24de KW |
596 | } |
597 | ||
52b8eb60 | 598 | return ret; |
27deebe8 FZ |
599 | |
600 | fail: | |
601 | ret = -EIO; | |
602 | goto done; | |
83f64091 FB |
603 | } |
604 | ||
a968168c | 605 | static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, |
27deebe8 | 606 | int nb_sectors, QEMUIOVector *qiov) |
83f64091 | 607 | { |
83f64091 | 608 | BDRVQcowState *s = bs->opaque; |
83f64091 FB |
609 | int index_in_cluster; |
610 | uint64_t cluster_offset; | |
611 | const uint8_t *src_buf; | |
27deebe8 | 612 | int ret = 0, n; |
430bbaaa FZ |
613 | uint8_t *cluster_data = NULL; |
614 | struct iovec hd_iov; | |
615 | QEMUIOVector hd_qiov; | |
27deebe8 FZ |
616 | uint8_t *buf; |
617 | void *orig_buf; | |
ce1a14dc | 618 | |
27deebe8 | 619 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
3b46e624 | 620 | |
27deebe8 FZ |
621 | if (qiov->niov > 1) { |
622 | buf = orig_buf = qemu_blockalign(bs, qiov->size); | |
d5e6b161 | 623 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
83f64091 | 624 | } else { |
27deebe8 FZ |
625 | orig_buf = NULL; |
626 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 627 | } |
c87c0672 | 628 | |
52b8eb60 | 629 | qemu_co_mutex_lock(&s->lock); |
43ca85b5 | 630 | |
27deebe8 | 631 | while (nb_sectors != 0) { |
83f64091 | 632 | |
27deebe8 FZ |
633 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
634 | n = s->cluster_sectors - index_in_cluster; | |
635 | if (n > nb_sectors) { | |
636 | n = nb_sectors; | |
637 | } | |
638 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0, | |
639 | index_in_cluster, | |
640 | index_in_cluster + n); | |
641 | if (!cluster_offset || (cluster_offset & 511) != 0) { | |
642 | ret = -EIO; | |
643 | break; | |
644 | } | |
645 | if (s->crypt_method) { | |
646 | if (!cluster_data) { | |
647 | cluster_data = g_malloc0(s->cluster_size); | |
648 | } | |
649 | encrypt_sectors(s, sector_num, cluster_data, buf, | |
650 | n, 1, &s->aes_encrypt_key); | |
651 | src_buf = cluster_data; | |
652 | } else { | |
653 | src_buf = buf; | |
654 | } | |
83f64091 | 655 | |
27deebe8 FZ |
656 | hd_iov.iov_base = (void *)src_buf; |
657 | hd_iov.iov_len = n * 512; | |
658 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); | |
659 | qemu_co_mutex_unlock(&s->lock); | |
660 | ret = bdrv_co_writev(bs->file, | |
661 | (cluster_offset >> 9) + index_in_cluster, | |
662 | n, &hd_qiov); | |
663 | qemu_co_mutex_lock(&s->lock); | |
664 | if (ret < 0) { | |
665 | break; | |
666 | } | |
667 | ret = 0; | |
ad53089b | 668 | |
27deebe8 FZ |
669 | nb_sectors -= n; |
670 | sector_num += n; | |
671 | buf += n * 512; | |
672 | } | |
52b8eb60 | 673 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 674 | |
27deebe8 FZ |
675 | if (qiov->niov > 1) { |
676 | qemu_vfree(orig_buf); | |
b11a24de | 677 | } |
add8d262 | 678 | g_free(cluster_data); |
b11a24de | 679 | |
52b8eb60 | 680 | return ret; |
83f64091 FB |
681 | } |
682 | ||
e2731add | 683 | static void qcow_close(BlockDriverState *bs) |
ea2384d3 FB |
684 | { |
685 | BDRVQcowState *s = bs->opaque; | |
fd9f102c | 686 | |
7267c094 AL |
687 | g_free(s->l1_table); |
688 | g_free(s->l2_cache); | |
689 | g_free(s->cluster_cache); | |
690 | g_free(s->cluster_data); | |
fd9f102c KW |
691 | |
692 | migrate_del_blocker(s->migration_blocker); | |
693 | error_free(s->migration_blocker); | |
ea2384d3 FB |
694 | } |
695 | ||
d5124c00 HR |
696 | static int qcow_create(const char *filename, QEMUOptionParameter *options, |
697 | Error **errp) | |
ea2384d3 | 698 | { |
2b16c9ff | 699 | int header_size, backing_filename_len, l1_size, shift, i; |
ea2384d3 | 700 | QCowHeader header; |
2b16c9ff | 701 | uint8_t *tmp; |
0e7e1989 KW |
702 | int64_t total_size = 0; |
703 | const char *backing_file = NULL; | |
704 | int flags = 0; | |
34b5d2c6 | 705 | Error *local_err = NULL; |
3e1a8134 | 706 | int ret; |
2b16c9ff | 707 | BlockDriverState *qcow_bs; |
0e7e1989 KW |
708 | |
709 | /* Read out options */ | |
710 | while (options && options->name) { | |
711 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
712 | total_size = options->value.n / 512; | |
713 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
714 | backing_file = options->value.s; | |
715 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
716 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
717 | } | |
718 | options++; | |
719 | } | |
ea2384d3 | 720 | |
cc84d90f | 721 | ret = bdrv_create_file(filename, options, &local_err); |
2b16c9ff | 722 | if (ret < 0) { |
b6d5066d | 723 | error_propagate(errp, local_err); |
2b16c9ff LZH |
724 | return ret; |
725 | } | |
726 | ||
2e40134b HR |
727 | qcow_bs = NULL; |
728 | ret = bdrv_open(&qcow_bs, filename, NULL, NULL, | |
729 | BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err); | |
2b16c9ff | 730 | if (ret < 0) { |
b6d5066d | 731 | error_propagate(errp, local_err); |
2b16c9ff LZH |
732 | return ret; |
733 | } | |
734 | ||
735 | ret = bdrv_truncate(qcow_bs, 0); | |
736 | if (ret < 0) { | |
737 | goto exit; | |
738 | } | |
739 | ||
ea2384d3 FB |
740 | memset(&header, 0, sizeof(header)); |
741 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
742 | header.version = cpu_to_be32(QCOW_VERSION); | |
743 | header.size = cpu_to_be64(total_size * 512); | |
744 | header_size = sizeof(header); | |
745 | backing_filename_len = 0; | |
746 | if (backing_file) { | |
7852e5da AJ |
747 | if (strcmp(backing_file, "fat:")) { |
748 | header.backing_file_offset = cpu_to_be64(header_size); | |
749 | backing_filename_len = strlen(backing_file); | |
750 | header.backing_file_size = cpu_to_be32(backing_filename_len); | |
751 | header_size += backing_filename_len; | |
752 | } else { | |
753 | /* special backing file for vvfat */ | |
754 | backing_file = NULL; | |
755 | } | |
ea2384d3 | 756 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
dc6fb73d | 757 | unmodified sectors */ |
ea2384d3 FB |
758 | header.l2_bits = 12; /* 32 KB L2 tables */ |
759 | } else { | |
760 | header.cluster_bits = 12; /* 4 KB clusters */ | |
761 | header.l2_bits = 9; /* 4 KB L2 tables */ | |
762 | } | |
763 | header_size = (header_size + 7) & ~7; | |
764 | shift = header.cluster_bits + header.l2_bits; | |
765 | l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift; | |
766 | ||
767 | header.l1_table_offset = cpu_to_be64(header_size); | |
ec36ba14 | 768 | if (flags & BLOCK_FLAG_ENCRYPT) { |
ea2384d3 FB |
769 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
770 | } else { | |
771 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
772 | } | |
3b46e624 | 773 | |
ea2384d3 | 774 | /* write all the data */ |
2b16c9ff | 775 | ret = bdrv_pwrite(qcow_bs, 0, &header, sizeof(header)); |
3e1a8134 | 776 | if (ret != sizeof(header)) { |
3e1a8134 KS |
777 | goto exit; |
778 | } | |
779 | ||
ea2384d3 | 780 | if (backing_file) { |
2b16c9ff LZH |
781 | ret = bdrv_pwrite(qcow_bs, sizeof(header), |
782 | backing_file, backing_filename_len); | |
3e1a8134 | 783 | if (ret != backing_filename_len) { |
3e1a8134 KS |
784 | goto exit; |
785 | } | |
ea2384d3 | 786 | } |
2b16c9ff LZH |
787 | |
788 | tmp = g_malloc0(BDRV_SECTOR_SIZE); | |
789 | for (i = 0; i < ((sizeof(uint64_t)*l1_size + BDRV_SECTOR_SIZE - 1)/ | |
790 | BDRV_SECTOR_SIZE); i++) { | |
791 | ret = bdrv_pwrite(qcow_bs, header_size + | |
792 | BDRV_SECTOR_SIZE*i, tmp, BDRV_SECTOR_SIZE); | |
793 | if (ret != BDRV_SECTOR_SIZE) { | |
794 | g_free(tmp); | |
3e1a8134 KS |
795 | goto exit; |
796 | } | |
ea2384d3 | 797 | } |
3e1a8134 | 798 | |
2b16c9ff | 799 | g_free(tmp); |
3e1a8134 KS |
800 | ret = 0; |
801 | exit: | |
4f6fd349 | 802 | bdrv_unref(qcow_bs); |
3e1a8134 | 803 | return ret; |
ea2384d3 FB |
804 | } |
805 | ||
c47c33b0 | 806 | static int qcow_make_empty(BlockDriverState *bs) |
95389c86 FB |
807 | { |
808 | BDRVQcowState *s = bs->opaque; | |
809 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
83f64091 | 810 | int ret; |
95389c86 FB |
811 | |
812 | memset(s->l1_table, 0, l1_length); | |
5e5557d9 KW |
813 | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table, |
814 | l1_length) < 0) | |
815 | return -1; | |
66f82cee | 816 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
83f64091 FB |
817 | if (ret < 0) |
818 | return ret; | |
95389c86 FB |
819 | |
820 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); | |
821 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); | |
822 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
ea2384d3 FB |
827 | /* XXX: put compressed sectors first, then all the cluster aligned |
828 | tables to avoid losing bytes in alignment */ | |
5fafdf24 | 829 | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
c47c33b0 | 830 | const uint8_t *buf, int nb_sectors) |
ea2384d3 FB |
831 | { |
832 | BDRVQcowState *s = bs->opaque; | |
833 | z_stream strm; | |
834 | int ret, out_len; | |
835 | uint8_t *out_buf; | |
836 | uint64_t cluster_offset; | |
837 | ||
16b3c5cd SH |
838 | if (nb_sectors != s->cluster_sectors) { |
839 | ret = -EINVAL; | |
840 | ||
841 | /* Zero-pad last write if image size is not cluster aligned */ | |
842 | if (sector_num + nb_sectors == bs->total_sectors && | |
843 | nb_sectors < s->cluster_sectors) { | |
844 | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); | |
845 | memset(pad_buf, 0, s->cluster_size); | |
846 | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); | |
847 | ret = qcow_write_compressed(bs, sector_num, | |
848 | pad_buf, s->cluster_sectors); | |
849 | qemu_vfree(pad_buf); | |
850 | } | |
851 | return ret; | |
852 | } | |
ea2384d3 | 853 | |
7267c094 | 854 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
ea2384d3 FB |
855 | |
856 | /* best compression, small window, no zlib header */ | |
857 | memset(&strm, 0, sizeof(strm)); | |
858 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
5fafdf24 | 859 | Z_DEFLATED, -12, |
ea2384d3 FB |
860 | 9, Z_DEFAULT_STRATEGY); |
861 | if (ret != 0) { | |
64ebe71a KW |
862 | ret = -EINVAL; |
863 | goto fail; | |
ea2384d3 FB |
864 | } |
865 | ||
866 | strm.avail_in = s->cluster_size; | |
867 | strm.next_in = (uint8_t *)buf; | |
868 | strm.avail_out = s->cluster_size; | |
869 | strm.next_out = out_buf; | |
870 | ||
871 | ret = deflate(&strm, Z_FINISH); | |
872 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
ea2384d3 | 873 | deflateEnd(&strm); |
64ebe71a KW |
874 | ret = -EINVAL; |
875 | goto fail; | |
ea2384d3 FB |
876 | } |
877 | out_len = strm.next_out - out_buf; | |
878 | ||
879 | deflateEnd(&strm); | |
880 | ||
881 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
882 | /* could not compress: write normal cluster */ | |
64ebe71a KW |
883 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
884 | if (ret < 0) { | |
885 | goto fail; | |
886 | } | |
ea2384d3 | 887 | } else { |
5fafdf24 | 888 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
ea2384d3 | 889 | out_len, 0, 0); |
64ebe71a KW |
890 | if (cluster_offset == 0) { |
891 | ret = -EIO; | |
892 | goto fail; | |
893 | } | |
894 | ||
ea2384d3 | 895 | cluster_offset &= s->cluster_offset_mask; |
64ebe71a KW |
896 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
897 | if (ret < 0) { | |
898 | goto fail; | |
ea2384d3 FB |
899 | } |
900 | } | |
3b46e624 | 901 | |
64ebe71a KW |
902 | ret = 0; |
903 | fail: | |
7267c094 | 904 | g_free(out_buf); |
64ebe71a | 905 | return ret; |
ea2384d3 FB |
906 | } |
907 | ||
c47c33b0 FB |
908 | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
909 | { | |
910 | BDRVQcowState *s = bs->opaque; | |
911 | bdi->cluster_size = s->cluster_size; | |
912 | return 0; | |
913 | } | |
914 | ||
0e7e1989 KW |
915 | |
916 | static QEMUOptionParameter qcow_create_options[] = { | |
db08adf5 KW |
917 | { |
918 | .name = BLOCK_OPT_SIZE, | |
919 | .type = OPT_SIZE, | |
920 | .help = "Virtual disk size" | |
921 | }, | |
922 | { | |
923 | .name = BLOCK_OPT_BACKING_FILE, | |
924 | .type = OPT_STRING, | |
925 | .help = "File name of a base image" | |
926 | }, | |
927 | { | |
928 | .name = BLOCK_OPT_ENCRYPT, | |
929 | .type = OPT_FLAG, | |
930 | .help = "Encrypt the image" | |
931 | }, | |
0e7e1989 KW |
932 | { NULL } |
933 | }; | |
934 | ||
5efa9d5a | 935 | static BlockDriver bdrv_qcow = { |
e60f469c AJ |
936 | .format_name = "qcow", |
937 | .instance_size = sizeof(BDRVQcowState), | |
938 | .bdrv_probe = qcow_probe, | |
939 | .bdrv_open = qcow_open, | |
940 | .bdrv_close = qcow_close, | |
d177692e | 941 | .bdrv_reopen_prepare = qcow_reopen_prepare, |
e60f469c | 942 | .bdrv_create = qcow_create, |
3ac21627 | 943 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
c68b89ac KW |
944 | |
945 | .bdrv_co_readv = qcow_co_readv, | |
946 | .bdrv_co_writev = qcow_co_writev, | |
b6b8a333 | 947 | .bdrv_co_get_block_status = qcow_co_get_block_status, |
c68b89ac KW |
948 | |
949 | .bdrv_set_key = qcow_set_key, | |
950 | .bdrv_make_empty = qcow_make_empty, | |
951 | .bdrv_write_compressed = qcow_write_compressed, | |
952 | .bdrv_get_info = qcow_get_info, | |
0e7e1989 KW |
953 | |
954 | .create_options = qcow_create_options, | |
ea2384d3 | 955 | }; |
5efa9d5a AL |
956 | |
957 | static void bdrv_qcow_init(void) | |
958 | { | |
959 | bdrv_register(&bdrv_qcow); | |
960 | } | |
961 | ||
962 | block_init(bdrv_qcow_init); |