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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" |
ea2384d3 | 25 | #include "block_int.h" |
5efa9d5a | 26 | #include "module.h" |
28d34b82 | 27 | #include <zlib.h> |
ea2384d3 FB |
28 | #include "aes.h" |
29 | ||
30 | /**************************************************************/ | |
31 | /* QEMU COW block driver with compression and encryption support */ | |
32 | ||
33 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) | |
34 | #define QCOW_VERSION 1 | |
35 | ||
36 | #define QCOW_CRYPT_NONE 0 | |
37 | #define QCOW_CRYPT_AES 1 | |
38 | ||
39 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) | |
40 | ||
41 | typedef struct QCowHeader { | |
42 | uint32_t magic; | |
43 | uint32_t version; | |
44 | uint64_t backing_file_offset; | |
45 | uint32_t backing_file_size; | |
46 | uint32_t mtime; | |
47 | uint64_t size; /* in bytes */ | |
48 | uint8_t cluster_bits; | |
49 | uint8_t l2_bits; | |
50 | uint32_t crypt_method; | |
51 | uint64_t l1_table_offset; | |
52 | } QCowHeader; | |
53 | ||
54 | #define L2_CACHE_SIZE 16 | |
55 | ||
56 | typedef struct BDRVQcowState { | |
ea2384d3 FB |
57 | int cluster_bits; |
58 | int cluster_size; | |
59 | int cluster_sectors; | |
60 | int l2_bits; | |
61 | int l2_size; | |
62 | int l1_size; | |
63 | uint64_t cluster_offset_mask; | |
64 | uint64_t l1_table_offset; | |
65 | uint64_t *l1_table; | |
66 | uint64_t *l2_cache; | |
67 | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; | |
68 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
69 | uint8_t *cluster_cache; | |
70 | uint8_t *cluster_data; | |
71 | uint64_t cluster_cache_offset; | |
72 | uint32_t crypt_method; /* current crypt method, 0 if no key yet */ | |
73 | uint32_t crypt_method_header; | |
74 | AES_KEY aes_encrypt_key; | |
75 | AES_KEY aes_decrypt_key; | |
52b8eb60 | 76 | CoMutex lock; |
ea2384d3 FB |
77 | } BDRVQcowState; |
78 | ||
66f82cee | 79 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
ea2384d3 FB |
80 | |
81 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) | |
82 | { | |
83 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 84 | |
712e7874 FB |
85 | if (buf_size >= sizeof(QCowHeader) && |
86 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
5fafdf24 | 87 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
ea2384d3 FB |
88 | return 100; |
89 | else | |
90 | return 0; | |
91 | } | |
92 | ||
66f82cee | 93 | static int qcow_open(BlockDriverState *bs, int flags) |
ea2384d3 FB |
94 | { |
95 | BDRVQcowState *s = bs->opaque; | |
66f82cee | 96 | int len, i, shift; |
ea2384d3 | 97 | QCowHeader header; |
83f64091 | 98 | |
66f82cee | 99 | if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header)) |
ea2384d3 FB |
100 | goto fail; |
101 | be32_to_cpus(&header.magic); | |
102 | be32_to_cpus(&header.version); | |
103 | be64_to_cpus(&header.backing_file_offset); | |
104 | be32_to_cpus(&header.backing_file_size); | |
105 | be32_to_cpus(&header.mtime); | |
106 | be64_to_cpus(&header.size); | |
107 | be32_to_cpus(&header.crypt_method); | |
108 | be64_to_cpus(&header.l1_table_offset); | |
3b46e624 | 109 | |
ea2384d3 FB |
110 | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION) |
111 | goto fail; | |
112 | if (header.size <= 1 || header.cluster_bits < 9) | |
113 | goto fail; | |
114 | if (header.crypt_method > QCOW_CRYPT_AES) | |
115 | goto fail; | |
116 | s->crypt_method_header = header.crypt_method; | |
117 | if (s->crypt_method_header) | |
118 | bs->encrypted = 1; | |
119 | s->cluster_bits = header.cluster_bits; | |
120 | s->cluster_size = 1 << s->cluster_bits; | |
121 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
122 | s->l2_bits = header.l2_bits; | |
123 | s->l2_size = 1 << s->l2_bits; | |
124 | bs->total_sectors = header.size / 512; | |
125 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; | |
126 | ||
127 | /* read the level 1 table */ | |
128 | shift = s->cluster_bits + s->l2_bits; | |
129 | s->l1_size = (header.size + (1LL << shift) - 1) >> shift; | |
130 | ||
131 | s->l1_table_offset = header.l1_table_offset; | |
7267c094 | 132 | s->l1_table = g_malloc(s->l1_size * sizeof(uint64_t)); |
ea2384d3 FB |
133 | if (!s->l1_table) |
134 | goto fail; | |
66f82cee | 135 | if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
ea2384d3 FB |
136 | s->l1_size * sizeof(uint64_t)) |
137 | goto fail; | |
138 | for(i = 0;i < s->l1_size; i++) { | |
139 | be64_to_cpus(&s->l1_table[i]); | |
140 | } | |
141 | /* alloc L2 cache */ | |
7267c094 | 142 | s->l2_cache = g_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
ea2384d3 FB |
143 | if (!s->l2_cache) |
144 | goto fail; | |
7267c094 | 145 | s->cluster_cache = g_malloc(s->cluster_size); |
ea2384d3 FB |
146 | if (!s->cluster_cache) |
147 | goto fail; | |
7267c094 | 148 | s->cluster_data = g_malloc(s->cluster_size); |
ea2384d3 FB |
149 | if (!s->cluster_data) |
150 | goto fail; | |
151 | s->cluster_cache_offset = -1; | |
3b46e624 | 152 | |
ea2384d3 FB |
153 | /* read the backing file name */ |
154 | if (header.backing_file_offset != 0) { | |
155 | len = header.backing_file_size; | |
156 | if (len > 1023) | |
157 | len = 1023; | |
66f82cee | 158 | if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len) |
ea2384d3 FB |
159 | goto fail; |
160 | bs->backing_file[len] = '\0'; | |
161 | } | |
de33b1f3 SW |
162 | |
163 | qemu_co_mutex_init(&s->lock); | |
ea2384d3 FB |
164 | return 0; |
165 | ||
166 | fail: | |
7267c094 AL |
167 | g_free(s->l1_table); |
168 | g_free(s->l2_cache); | |
169 | g_free(s->cluster_cache); | |
170 | g_free(s->cluster_data); | |
ea2384d3 FB |
171 | return -1; |
172 | } | |
173 | ||
174 | static int qcow_set_key(BlockDriverState *bs, const char *key) | |
175 | { | |
176 | BDRVQcowState *s = bs->opaque; | |
177 | uint8_t keybuf[16]; | |
178 | int len, i; | |
3b46e624 | 179 | |
ea2384d3 FB |
180 | memset(keybuf, 0, 16); |
181 | len = strlen(key); | |
182 | if (len > 16) | |
183 | len = 16; | |
184 | /* XXX: we could compress the chars to 7 bits to increase | |
185 | entropy */ | |
186 | for(i = 0;i < len;i++) { | |
187 | keybuf[i] = key[i]; | |
188 | } | |
189 | s->crypt_method = s->crypt_method_header; | |
190 | ||
191 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
192 | return -1; | |
193 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
194 | return -1; | |
195 | #if 0 | |
196 | /* test */ | |
197 | { | |
198 | uint8_t in[16]; | |
199 | uint8_t out[16]; | |
200 | uint8_t tmp[16]; | |
201 | for(i=0;i<16;i++) | |
202 | in[i] = i; | |
203 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
204 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
205 | for(i = 0; i < 16; i++) | |
206 | printf(" %02x", tmp[i]); | |
207 | printf("\n"); | |
208 | for(i = 0; i < 16; i++) | |
209 | printf(" %02x", out[i]); | |
210 | printf("\n"); | |
211 | } | |
212 | #endif | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* The crypt function is compatible with the linux cryptoloop | |
217 | algorithm for < 4 GB images. NOTE: out_buf == in_buf is | |
218 | supported */ | |
219 | static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num, | |
220 | uint8_t *out_buf, const uint8_t *in_buf, | |
221 | int nb_sectors, int enc, | |
222 | const AES_KEY *key) | |
223 | { | |
224 | union { | |
225 | uint64_t ll[2]; | |
226 | uint8_t b[16]; | |
227 | } ivec; | |
228 | int i; | |
229 | ||
230 | for(i = 0; i < nb_sectors; i++) { | |
231 | ivec.ll[0] = cpu_to_le64(sector_num); | |
232 | ivec.ll[1] = 0; | |
5fafdf24 | 233 | AES_cbc_encrypt(in_buf, out_buf, 512, key, |
ea2384d3 FB |
234 | ivec.b, enc); |
235 | sector_num++; | |
236 | in_buf += 512; | |
237 | out_buf += 512; | |
238 | } | |
239 | } | |
240 | ||
241 | /* 'allocate' is: | |
242 | * | |
243 | * 0 to not allocate. | |
244 | * | |
245 | * 1 to allocate a normal cluster (for sector indexes 'n_start' to | |
246 | * 'n_end') | |
247 | * | |
248 | * 2 to allocate a compressed cluster of size | |
249 | * 'compressed_size'. 'compressed_size' must be > 0 and < | |
5fafdf24 | 250 | * cluster_size |
ea2384d3 FB |
251 | * |
252 | * return 0 if not allocated. | |
253 | */ | |
254 | static uint64_t get_cluster_offset(BlockDriverState *bs, | |
255 | uint64_t offset, int allocate, | |
256 | int compressed_size, | |
257 | int n_start, int n_end) | |
258 | { | |
259 | BDRVQcowState *s = bs->opaque; | |
260 | int min_index, i, j, l1_index, l2_index; | |
261 | uint64_t l2_offset, *l2_table, cluster_offset, tmp; | |
262 | uint32_t min_count; | |
263 | int new_l2_table; | |
3b46e624 | 264 | |
ea2384d3 FB |
265 | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
266 | l2_offset = s->l1_table[l1_index]; | |
267 | new_l2_table = 0; | |
268 | if (!l2_offset) { | |
269 | if (!allocate) | |
270 | return 0; | |
271 | /* allocate a new l2 entry */ | |
66f82cee | 272 | l2_offset = bdrv_getlength(bs->file); |
ea2384d3 FB |
273 | /* round to cluster size */ |
274 | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); | |
275 | /* update the L1 entry */ | |
276 | s->l1_table[l1_index] = l2_offset; | |
277 | tmp = cpu_to_be64(l2_offset); | |
5e5557d9 KW |
278 | if (bdrv_pwrite_sync(bs->file, |
279 | s->l1_table_offset + l1_index * sizeof(tmp), | |
280 | &tmp, sizeof(tmp)) < 0) | |
ea2384d3 FB |
281 | return 0; |
282 | new_l2_table = 1; | |
283 | } | |
284 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
285 | if (l2_offset == s->l2_cache_offsets[i]) { | |
286 | /* increment the hit count */ | |
287 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
288 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
289 | s->l2_cache_counts[j] >>= 1; | |
290 | } | |
291 | } | |
292 | l2_table = s->l2_cache + (i << s->l2_bits); | |
293 | goto found; | |
294 | } | |
295 | } | |
296 | /* not found: load a new entry in the least used one */ | |
297 | min_index = 0; | |
298 | min_count = 0xffffffff; | |
299 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
300 | if (s->l2_cache_counts[i] < min_count) { | |
301 | min_count = s->l2_cache_counts[i]; | |
302 | min_index = i; | |
303 | } | |
304 | } | |
305 | l2_table = s->l2_cache + (min_index << s->l2_bits); | |
ea2384d3 FB |
306 | if (new_l2_table) { |
307 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); | |
5e5557d9 KW |
308 | if (bdrv_pwrite_sync(bs->file, l2_offset, l2_table, |
309 | s->l2_size * sizeof(uint64_t)) < 0) | |
ea2384d3 FB |
310 | return 0; |
311 | } else { | |
66f82cee | 312 | if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != |
ea2384d3 FB |
313 | s->l2_size * sizeof(uint64_t)) |
314 | return 0; | |
315 | } | |
316 | s->l2_cache_offsets[min_index] = l2_offset; | |
317 | s->l2_cache_counts[min_index] = 1; | |
318 | found: | |
319 | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); | |
320 | cluster_offset = be64_to_cpu(l2_table[l2_index]); | |
5fafdf24 | 321 | if (!cluster_offset || |
ea2384d3 FB |
322 | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { |
323 | if (!allocate) | |
324 | return 0; | |
325 | /* allocate a new cluster */ | |
326 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && | |
327 | (n_end - n_start) < s->cluster_sectors) { | |
328 | /* if the cluster is already compressed, we must | |
329 | decompress it in the case it is not completely | |
330 | overwritten */ | |
66f82cee | 331 | if (decompress_cluster(bs, cluster_offset) < 0) |
ea2384d3 | 332 | return 0; |
66f82cee | 333 | cluster_offset = bdrv_getlength(bs->file); |
5fafdf24 | 334 | cluster_offset = (cluster_offset + s->cluster_size - 1) & |
ea2384d3 FB |
335 | ~(s->cluster_size - 1); |
336 | /* write the cluster content */ | |
66f82cee | 337 | if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, s->cluster_size) != |
ea2384d3 FB |
338 | s->cluster_size) |
339 | return -1; | |
340 | } else { | |
66f82cee | 341 | cluster_offset = bdrv_getlength(bs->file); |
7f48fa1f AL |
342 | if (allocate == 1) { |
343 | /* round to cluster size */ | |
344 | cluster_offset = (cluster_offset + s->cluster_size - 1) & | |
345 | ~(s->cluster_size - 1); | |
66f82cee | 346 | bdrv_truncate(bs->file, cluster_offset + s->cluster_size); |
7f48fa1f AL |
347 | /* if encrypted, we must initialize the cluster |
348 | content which won't be written */ | |
349 | if (s->crypt_method && | |
350 | (n_end - n_start) < s->cluster_sectors) { | |
351 | uint64_t start_sect; | |
352 | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; | |
353 | memset(s->cluster_data + 512, 0x00, 512); | |
354 | for(i = 0; i < s->cluster_sectors; i++) { | |
355 | if (i < n_start || i >= n_end) { | |
356 | encrypt_sectors(s, start_sect + i, | |
357 | s->cluster_data, | |
358 | s->cluster_data + 512, 1, 1, | |
359 | &s->aes_encrypt_key); | |
66f82cee | 360 | if (bdrv_pwrite(bs->file, cluster_offset + i * 512, |
7f48fa1f AL |
361 | s->cluster_data, 512) != 512) |
362 | return -1; | |
363 | } | |
ea2384d3 FB |
364 | } |
365 | } | |
7f48fa1f AL |
366 | } else if (allocate == 2) { |
367 | cluster_offset |= QCOW_OFLAG_COMPRESSED | | |
368 | (uint64_t)compressed_size << (63 - s->cluster_bits); | |
ea2384d3 FB |
369 | } |
370 | } | |
371 | /* update L2 table */ | |
372 | tmp = cpu_to_be64(cluster_offset); | |
373 | l2_table[l2_index] = tmp; | |
5e5557d9 KW |
374 | if (bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
375 | &tmp, sizeof(tmp)) < 0) | |
ea2384d3 FB |
376 | return 0; |
377 | } | |
378 | return cluster_offset; | |
379 | } | |
380 | ||
5fafdf24 | 381 | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
382 | int nb_sectors, int *pnum) |
383 | { | |
384 | BDRVQcowState *s = bs->opaque; | |
385 | int index_in_cluster, n; | |
386 | uint64_t cluster_offset; | |
387 | ||
388 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); | |
389 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
390 | n = s->cluster_sectors - index_in_cluster; | |
391 | if (n > nb_sectors) | |
392 | n = nb_sectors; | |
393 | *pnum = n; | |
394 | return (cluster_offset != 0); | |
395 | } | |
396 | ||
397 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, | |
398 | const uint8_t *buf, int buf_size) | |
399 | { | |
400 | z_stream strm1, *strm = &strm1; | |
401 | int ret, out_len; | |
402 | ||
403 | memset(strm, 0, sizeof(*strm)); | |
404 | ||
405 | strm->next_in = (uint8_t *)buf; | |
406 | strm->avail_in = buf_size; | |
407 | strm->next_out = out_buf; | |
408 | strm->avail_out = out_buf_size; | |
409 | ||
410 | ret = inflateInit2(strm, -12); | |
411 | if (ret != Z_OK) | |
412 | return -1; | |
413 | ret = inflate(strm, Z_FINISH); | |
414 | out_len = strm->next_out - out_buf; | |
415 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || | |
416 | out_len != out_buf_size) { | |
417 | inflateEnd(strm); | |
418 | return -1; | |
419 | } | |
420 | inflateEnd(strm); | |
421 | return 0; | |
422 | } | |
3b46e624 | 423 | |
66f82cee | 424 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
ea2384d3 | 425 | { |
66f82cee | 426 | BDRVQcowState *s = bs->opaque; |
ea2384d3 FB |
427 | int ret, csize; |
428 | uint64_t coffset; | |
429 | ||
430 | coffset = cluster_offset & s->cluster_offset_mask; | |
431 | if (s->cluster_cache_offset != coffset) { | |
432 | csize = cluster_offset >> (63 - s->cluster_bits); | |
433 | csize &= (s->cluster_size - 1); | |
66f82cee | 434 | ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize); |
5fafdf24 | 435 | if (ret != csize) |
ea2384d3 FB |
436 | return -1; |
437 | if (decompress_buffer(s->cluster_cache, s->cluster_size, | |
438 | s->cluster_data, csize) < 0) { | |
439 | return -1; | |
440 | } | |
441 | s->cluster_cache_offset = coffset; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
83f64091 FB |
446 | #if 0 |
447 | ||
5fafdf24 | 448 | static int qcow_read(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
449 | uint8_t *buf, int nb_sectors) |
450 | { | |
451 | BDRVQcowState *s = bs->opaque; | |
452 | int ret, index_in_cluster, n; | |
453 | uint64_t cluster_offset; | |
3b46e624 | 454 | |
ea2384d3 FB |
455 | while (nb_sectors > 0) { |
456 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); | |
457 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
458 | n = s->cluster_sectors - index_in_cluster; | |
459 | if (n > nb_sectors) | |
460 | n = nb_sectors; | |
461 | if (!cluster_offset) { | |
83f64091 FB |
462 | if (bs->backing_hd) { |
463 | /* read from the base image */ | |
464 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); | |
465 | if (ret < 0) | |
466 | return -1; | |
467 | } else { | |
468 | memset(buf, 0, 512 * n); | |
469 | } | |
ea2384d3 | 470 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
66f82cee | 471 | if (decompress_cluster(bs, cluster_offset) < 0) |
ea2384d3 FB |
472 | return -1; |
473 | memcpy(buf, s->cluster_cache + index_in_cluster * 512, 512 * n); | |
474 | } else { | |
66f82cee | 475 | ret = bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512); |
5fafdf24 | 476 | if (ret != n * 512) |
ea2384d3 FB |
477 | return -1; |
478 | if (s->crypt_method) { | |
5fafdf24 | 479 | encrypt_sectors(s, sector_num, buf, buf, n, 0, |
ea2384d3 FB |
480 | &s->aes_decrypt_key); |
481 | } | |
482 | } | |
483 | nb_sectors -= n; | |
484 | sector_num += n; | |
485 | buf += n * 512; | |
486 | } | |
487 | return 0; | |
488 | } | |
83f64091 | 489 | #endif |
ea2384d3 | 490 | |
ce1a14dc PB |
491 | typedef struct QCowAIOCB { |
492 | BlockDriverAIOCB common; | |
83f64091 | 493 | int64_t sector_num; |
f141eafe | 494 | QEMUIOVector *qiov; |
83f64091 | 495 | uint8_t *buf; |
f141eafe | 496 | void *orig_buf; |
83f64091 FB |
497 | int nb_sectors; |
498 | int n; | |
499 | uint64_t cluster_offset; | |
5fafdf24 | 500 | uint8_t *cluster_data; |
c87c0672 | 501 | struct iovec hd_iov; |
b11a24de KW |
502 | bool is_write; |
503 | QEMUBH *bh; | |
c87c0672 | 504 | QEMUIOVector hd_qiov; |
83f64091 | 505 | BlockDriverAIOCB *hd_aiocb; |
83f64091 FB |
506 | } QCowAIOCB; |
507 | ||
ad53089b CH |
508 | static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs, |
509 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
f5cd8173 | 510 | int is_write, QCowAIOCB *acb) |
ad53089b | 511 | { |
f5cd8173 FZ |
512 | memset(acb, 0, sizeof(*acb)); |
513 | acb->common.bs = bs; | |
ad53089b CH |
514 | acb->hd_aiocb = NULL; |
515 | acb->sector_num = sector_num; | |
516 | acb->qiov = qiov; | |
b11a24de KW |
517 | acb->is_write = is_write; |
518 | ||
ad53089b CH |
519 | if (qiov->niov > 1) { |
520 | acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size); | |
521 | if (is_write) | |
522 | qemu_iovec_to_buffer(qiov, acb->buf); | |
523 | } else { | |
524 | acb->buf = (uint8_t *)qiov->iov->iov_base; | |
525 | } | |
526 | acb->nb_sectors = nb_sectors; | |
527 | acb->n = 0; | |
528 | acb->cluster_offset = 0; | |
529 | return acb; | |
530 | } | |
531 | ||
f5cd8173 | 532 | static int qcow_aio_read_cb(QCowAIOCB *acb) |
83f64091 | 533 | { |
ce1a14dc | 534 | BlockDriverState *bs = acb->common.bs; |
83f64091 | 535 | BDRVQcowState *s = bs->opaque; |
83f64091 | 536 | int index_in_cluster; |
52b8eb60 | 537 | int ret; |
83f64091 | 538 | |
ce1a14dc | 539 | acb->hd_aiocb = NULL; |
83f64091 FB |
540 | |
541 | redo: | |
542 | /* post process the read buffer */ | |
ce1a14dc | 543 | if (!acb->cluster_offset) { |
83f64091 | 544 | /* nothing to do */ |
ce1a14dc | 545 | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
83f64091 FB |
546 | /* nothing to do */ |
547 | } else { | |
548 | if (s->crypt_method) { | |
5fafdf24 TS |
549 | encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf, |
550 | acb->n, 0, | |
83f64091 FB |
551 | &s->aes_decrypt_key); |
552 | } | |
553 | } | |
554 | ||
ce1a14dc PB |
555 | acb->nb_sectors -= acb->n; |
556 | acb->sector_num += acb->n; | |
557 | acb->buf += acb->n * 512; | |
83f64091 | 558 | |
ce1a14dc | 559 | if (acb->nb_sectors == 0) { |
83f64091 | 560 | /* request completed */ |
52b8eb60 | 561 | return 0; |
83f64091 | 562 | } |
3b46e624 | 563 | |
83f64091 | 564 | /* prepare next AIO request */ |
5fafdf24 | 565 | acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, |
ce1a14dc PB |
566 | 0, 0, 0, 0); |
567 | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1); | |
568 | acb->n = s->cluster_sectors - index_in_cluster; | |
569 | if (acb->n > acb->nb_sectors) | |
570 | acb->n = acb->nb_sectors; | |
571 | ||
572 | if (!acb->cluster_offset) { | |
83f64091 FB |
573 | if (bs->backing_hd) { |
574 | /* read from the base image */ | |
3f4cb3d3 | 575 | acb->hd_iov.iov_base = (void *)acb->buf; |
c87c0672 AL |
576 | acb->hd_iov.iov_len = acb->n * 512; |
577 | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); | |
52b8eb60 KW |
578 | qemu_co_mutex_unlock(&s->lock); |
579 | ret = bdrv_co_readv(bs->backing_hd, acb->sector_num, | |
580 | acb->n, &acb->hd_qiov); | |
581 | qemu_co_mutex_lock(&s->lock); | |
582 | if (ret < 0) { | |
583 | return -EIO; | |
5614c188 | 584 | } |
83f64091 FB |
585 | } else { |
586 | /* Note: in this case, no need to wait */ | |
ce1a14dc | 587 | memset(acb->buf, 0, 512 * acb->n); |
83f64091 FB |
588 | goto redo; |
589 | } | |
ce1a14dc | 590 | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
83f64091 | 591 | /* add AIO support for compressed blocks ? */ |
5614c188 | 592 | if (decompress_cluster(bs, acb->cluster_offset) < 0) { |
52b8eb60 | 593 | return -EIO; |
5614c188 | 594 | } |
5fafdf24 | 595 | memcpy(acb->buf, |
ce1a14dc | 596 | s->cluster_cache + index_in_cluster * 512, 512 * acb->n); |
83f64091 FB |
597 | goto redo; |
598 | } else { | |
ce1a14dc | 599 | if ((acb->cluster_offset & 511) != 0) { |
52b8eb60 | 600 | return -EIO; |
83f64091 | 601 | } |
3f4cb3d3 | 602 | acb->hd_iov.iov_base = (void *)acb->buf; |
c87c0672 AL |
603 | acb->hd_iov.iov_len = acb->n * 512; |
604 | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); | |
52b8eb60 KW |
605 | qemu_co_mutex_unlock(&s->lock); |
606 | ret = bdrv_co_readv(bs->file, | |
5fafdf24 | 607 | (acb->cluster_offset >> 9) + index_in_cluster, |
52b8eb60 KW |
608 | acb->n, &acb->hd_qiov); |
609 | qemu_co_mutex_lock(&s->lock); | |
610 | if (ret < 0) { | |
611 | return ret; | |
5614c188 | 612 | } |
f141eafe AL |
613 | } |
614 | ||
52b8eb60 | 615 | return 1; |
83f64091 FB |
616 | } |
617 | ||
52b8eb60 KW |
618 | static int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, |
619 | int nb_sectors, QEMUIOVector *qiov) | |
83f64091 | 620 | { |
52b8eb60 | 621 | BDRVQcowState *s = bs->opaque; |
f5cd8173 | 622 | QCowAIOCB acb; |
b11a24de | 623 | int ret; |
ce1a14dc | 624 | |
f5cd8173 | 625 | qcow_aio_setup(bs, sector_num, qiov, nb_sectors, 0, &acb); |
83f64091 | 626 | |
52b8eb60 KW |
627 | qemu_co_mutex_lock(&s->lock); |
628 | do { | |
f5cd8173 | 629 | ret = qcow_aio_read_cb(&acb); |
52b8eb60 KW |
630 | } while (ret > 0); |
631 | qemu_co_mutex_unlock(&s->lock); | |
632 | ||
f5cd8173 FZ |
633 | if (acb.qiov->niov > 1) { |
634 | qemu_iovec_from_buffer(acb.qiov, acb.orig_buf, acb.qiov->size); | |
635 | qemu_vfree(acb.orig_buf); | |
b11a24de KW |
636 | } |
637 | ||
52b8eb60 | 638 | return ret; |
83f64091 FB |
639 | } |
640 | ||
f5cd8173 | 641 | static int qcow_aio_write_cb(QCowAIOCB *acb) |
83f64091 | 642 | { |
ce1a14dc | 643 | BlockDriverState *bs = acb->common.bs; |
83f64091 | 644 | BDRVQcowState *s = bs->opaque; |
83f64091 FB |
645 | int index_in_cluster; |
646 | uint64_t cluster_offset; | |
647 | const uint8_t *src_buf; | |
52b8eb60 | 648 | int ret; |
ce1a14dc PB |
649 | |
650 | acb->hd_aiocb = NULL; | |
651 | ||
ce1a14dc PB |
652 | acb->nb_sectors -= acb->n; |
653 | acb->sector_num += acb->n; | |
654 | acb->buf += acb->n * 512; | |
83f64091 | 655 | |
ce1a14dc | 656 | if (acb->nb_sectors == 0) { |
83f64091 | 657 | /* request completed */ |
52b8eb60 | 658 | return 0; |
83f64091 | 659 | } |
3b46e624 | 660 | |
ce1a14dc PB |
661 | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1); |
662 | acb->n = s->cluster_sectors - index_in_cluster; | |
663 | if (acb->n > acb->nb_sectors) | |
664 | acb->n = acb->nb_sectors; | |
5fafdf24 TS |
665 | cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, 1, 0, |
666 | index_in_cluster, | |
ce1a14dc | 667 | index_in_cluster + acb->n); |
83f64091 | 668 | if (!cluster_offset || (cluster_offset & 511) != 0) { |
52b8eb60 | 669 | return -EIO; |
83f64091 FB |
670 | } |
671 | if (s->crypt_method) { | |
ce1a14dc | 672 | if (!acb->cluster_data) { |
7267c094 | 673 | acb->cluster_data = g_malloc0(s->cluster_size); |
83f64091 | 674 | } |
5fafdf24 | 675 | encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf, |
ce1a14dc PB |
676 | acb->n, 1, &s->aes_encrypt_key); |
677 | src_buf = acb->cluster_data; | |
83f64091 | 678 | } else { |
ce1a14dc | 679 | src_buf = acb->buf; |
83f64091 | 680 | } |
c87c0672 AL |
681 | |
682 | acb->hd_iov.iov_base = (void *)src_buf; | |
683 | acb->hd_iov.iov_len = acb->n * 512; | |
684 | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); | |
52b8eb60 KW |
685 | qemu_co_mutex_unlock(&s->lock); |
686 | ret = bdrv_co_writev(bs->file, | |
687 | (cluster_offset >> 9) + index_in_cluster, | |
688 | acb->n, &acb->hd_qiov); | |
689 | qemu_co_mutex_lock(&s->lock); | |
690 | if (ret < 0) { | |
691 | return ret; | |
5614c188 | 692 | } |
52b8eb60 | 693 | return 1; |
83f64091 FB |
694 | } |
695 | ||
52b8eb60 KW |
696 | static int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, |
697 | int nb_sectors, QEMUIOVector *qiov) | |
83f64091 | 698 | { |
83f64091 | 699 | BDRVQcowState *s = bs->opaque; |
f5cd8173 | 700 | QCowAIOCB acb; |
b11a24de | 701 | int ret; |
3b46e624 | 702 | |
83f64091 FB |
703 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
704 | ||
f5cd8173 | 705 | qcow_aio_setup(bs, sector_num, qiov, nb_sectors, 1, &acb); |
ad53089b | 706 | |
52b8eb60 KW |
707 | qemu_co_mutex_lock(&s->lock); |
708 | do { | |
f5cd8173 | 709 | ret = qcow_aio_write_cb(&acb); |
52b8eb60 KW |
710 | } while (ret > 0); |
711 | qemu_co_mutex_unlock(&s->lock); | |
3b46e624 | 712 | |
f5cd8173 FZ |
713 | if (acb.qiov->niov > 1) { |
714 | qemu_vfree(acb.orig_buf); | |
b11a24de KW |
715 | } |
716 | ||
52b8eb60 | 717 | return ret; |
83f64091 FB |
718 | } |
719 | ||
e2731add | 720 | static void qcow_close(BlockDriverState *bs) |
ea2384d3 FB |
721 | { |
722 | BDRVQcowState *s = bs->opaque; | |
7267c094 AL |
723 | g_free(s->l1_table); |
724 | g_free(s->l2_cache); | |
725 | g_free(s->cluster_cache); | |
726 | g_free(s->cluster_data); | |
ea2384d3 FB |
727 | } |
728 | ||
0e7e1989 | 729 | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
ea2384d3 FB |
730 | { |
731 | int fd, header_size, backing_filename_len, l1_size, i, shift; | |
732 | QCowHeader header; | |
ea2384d3 | 733 | uint64_t tmp; |
0e7e1989 KW |
734 | int64_t total_size = 0; |
735 | const char *backing_file = NULL; | |
736 | int flags = 0; | |
3e1a8134 | 737 | int ret; |
0e7e1989 KW |
738 | |
739 | /* Read out options */ | |
740 | while (options && options->name) { | |
741 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
742 | total_size = options->value.n / 512; | |
743 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
744 | backing_file = options->value.s; | |
745 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
746 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
747 | } | |
748 | options++; | |
749 | } | |
ea2384d3 | 750 | |
83f64091 | 751 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); |
ea2384d3 | 752 | if (fd < 0) |
98c2b2f4 | 753 | return -errno; |
ea2384d3 FB |
754 | memset(&header, 0, sizeof(header)); |
755 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
756 | header.version = cpu_to_be32(QCOW_VERSION); | |
757 | header.size = cpu_to_be64(total_size * 512); | |
758 | header_size = sizeof(header); | |
759 | backing_filename_len = 0; | |
760 | if (backing_file) { | |
7852e5da AJ |
761 | if (strcmp(backing_file, "fat:")) { |
762 | header.backing_file_offset = cpu_to_be64(header_size); | |
763 | backing_filename_len = strlen(backing_file); | |
764 | header.backing_file_size = cpu_to_be32(backing_filename_len); | |
765 | header_size += backing_filename_len; | |
766 | } else { | |
767 | /* special backing file for vvfat */ | |
768 | backing_file = NULL; | |
769 | } | |
ea2384d3 FB |
770 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
771 | unmodifyed sectors */ | |
772 | header.l2_bits = 12; /* 32 KB L2 tables */ | |
773 | } else { | |
774 | header.cluster_bits = 12; /* 4 KB clusters */ | |
775 | header.l2_bits = 9; /* 4 KB L2 tables */ | |
776 | } | |
777 | header_size = (header_size + 7) & ~7; | |
778 | shift = header.cluster_bits + header.l2_bits; | |
779 | l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift; | |
780 | ||
781 | header.l1_table_offset = cpu_to_be64(header_size); | |
ec36ba14 | 782 | if (flags & BLOCK_FLAG_ENCRYPT) { |
ea2384d3 FB |
783 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
784 | } else { | |
785 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
786 | } | |
3b46e624 | 787 | |
ea2384d3 | 788 | /* write all the data */ |
3e1a8134 KS |
789 | ret = qemu_write_full(fd, &header, sizeof(header)); |
790 | if (ret != sizeof(header)) { | |
98c2b2f4 | 791 | ret = -errno; |
3e1a8134 KS |
792 | goto exit; |
793 | } | |
794 | ||
ea2384d3 | 795 | if (backing_file) { |
3e1a8134 KS |
796 | ret = qemu_write_full(fd, backing_file, backing_filename_len); |
797 | if (ret != backing_filename_len) { | |
98c2b2f4 | 798 | ret = -errno; |
3e1a8134 KS |
799 | goto exit; |
800 | } | |
801 | ||
ea2384d3 FB |
802 | } |
803 | lseek(fd, header_size, SEEK_SET); | |
804 | tmp = 0; | |
805 | for(i = 0;i < l1_size; i++) { | |
3e1a8134 KS |
806 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); |
807 | if (ret != sizeof(tmp)) { | |
98c2b2f4 | 808 | ret = -errno; |
3e1a8134 KS |
809 | goto exit; |
810 | } | |
ea2384d3 | 811 | } |
3e1a8134 KS |
812 | |
813 | ret = 0; | |
814 | exit: | |
ea2384d3 | 815 | close(fd); |
3e1a8134 | 816 | return ret; |
ea2384d3 FB |
817 | } |
818 | ||
c47c33b0 | 819 | static int qcow_make_empty(BlockDriverState *bs) |
95389c86 FB |
820 | { |
821 | BDRVQcowState *s = bs->opaque; | |
822 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
83f64091 | 823 | int ret; |
95389c86 FB |
824 | |
825 | memset(s->l1_table, 0, l1_length); | |
5e5557d9 KW |
826 | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table, |
827 | l1_length) < 0) | |
828 | return -1; | |
66f82cee | 829 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
83f64091 FB |
830 | if (ret < 0) |
831 | return ret; | |
95389c86 FB |
832 | |
833 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); | |
834 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); | |
835 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); | |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
ea2384d3 FB |
840 | /* XXX: put compressed sectors first, then all the cluster aligned |
841 | tables to avoid losing bytes in alignment */ | |
5fafdf24 | 842 | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
c47c33b0 | 843 | const uint8_t *buf, int nb_sectors) |
ea2384d3 FB |
844 | { |
845 | BDRVQcowState *s = bs->opaque; | |
846 | z_stream strm; | |
847 | int ret, out_len; | |
848 | uint8_t *out_buf; | |
849 | uint64_t cluster_offset; | |
850 | ||
c47c33b0 FB |
851 | if (nb_sectors != s->cluster_sectors) |
852 | return -EINVAL; | |
ea2384d3 | 853 | |
7267c094 | 854 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
ea2384d3 FB |
855 | if (!out_buf) |
856 | return -1; | |
857 | ||
858 | /* best compression, small window, no zlib header */ | |
859 | memset(&strm, 0, sizeof(strm)); | |
860 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
5fafdf24 | 861 | Z_DEFLATED, -12, |
ea2384d3 FB |
862 | 9, Z_DEFAULT_STRATEGY); |
863 | if (ret != 0) { | |
7267c094 | 864 | g_free(out_buf); |
ea2384d3 FB |
865 | return -1; |
866 | } | |
867 | ||
868 | strm.avail_in = s->cluster_size; | |
869 | strm.next_in = (uint8_t *)buf; | |
870 | strm.avail_out = s->cluster_size; | |
871 | strm.next_out = out_buf; | |
872 | ||
873 | ret = deflate(&strm, Z_FINISH); | |
874 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
7267c094 | 875 | g_free(out_buf); |
ea2384d3 FB |
876 | deflateEnd(&strm); |
877 | return -1; | |
878 | } | |
879 | out_len = strm.next_out - out_buf; | |
880 | ||
881 | deflateEnd(&strm); | |
882 | ||
883 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
884 | /* could not compress: write normal cluster */ | |
ade40677 | 885 | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
ea2384d3 | 886 | } else { |
5fafdf24 | 887 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
ea2384d3 FB |
888 | out_len, 0, 0); |
889 | cluster_offset &= s->cluster_offset_mask; | |
66f82cee | 890 | if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) { |
7267c094 | 891 | g_free(out_buf); |
ea2384d3 FB |
892 | return -1; |
893 | } | |
894 | } | |
3b46e624 | 895 | |
7267c094 | 896 | g_free(out_buf); |
ea2384d3 FB |
897 | return 0; |
898 | } | |
899 | ||
205ef796 | 900 | static int qcow_flush(BlockDriverState *bs) |
7a6cba61 | 901 | { |
205ef796 | 902 | return bdrv_flush(bs->file); |
7a6cba61 PB |
903 | } |
904 | ||
f8012c13 KW |
905 | static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs, |
906 | BlockDriverCompletionFunc *cb, void *opaque) | |
907 | { | |
66f82cee | 908 | return bdrv_aio_flush(bs->file, cb, opaque); |
f8012c13 KW |
909 | } |
910 | ||
c47c33b0 FB |
911 | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
912 | { | |
913 | BDRVQcowState *s = bs->opaque; | |
914 | bdi->cluster_size = s->cluster_size; | |
915 | return 0; | |
916 | } | |
917 | ||
0e7e1989 KW |
918 | |
919 | static QEMUOptionParameter qcow_create_options[] = { | |
db08adf5 KW |
920 | { |
921 | .name = BLOCK_OPT_SIZE, | |
922 | .type = OPT_SIZE, | |
923 | .help = "Virtual disk size" | |
924 | }, | |
925 | { | |
926 | .name = BLOCK_OPT_BACKING_FILE, | |
927 | .type = OPT_STRING, | |
928 | .help = "File name of a base image" | |
929 | }, | |
930 | { | |
931 | .name = BLOCK_OPT_ENCRYPT, | |
932 | .type = OPT_FLAG, | |
933 | .help = "Encrypt the image" | |
934 | }, | |
0e7e1989 KW |
935 | { NULL } |
936 | }; | |
937 | ||
5efa9d5a | 938 | static BlockDriver bdrv_qcow = { |
e60f469c AJ |
939 | .format_name = "qcow", |
940 | .instance_size = sizeof(BDRVQcowState), | |
941 | .bdrv_probe = qcow_probe, | |
942 | .bdrv_open = qcow_open, | |
943 | .bdrv_close = qcow_close, | |
944 | .bdrv_create = qcow_create, | |
945 | .bdrv_flush = qcow_flush, | |
946 | .bdrv_is_allocated = qcow_is_allocated, | |
947 | .bdrv_set_key = qcow_set_key, | |
948 | .bdrv_make_empty = qcow_make_empty, | |
52b8eb60 KW |
949 | .bdrv_co_readv = qcow_co_readv, |
950 | .bdrv_co_writev = qcow_co_writev, | |
f8012c13 | 951 | .bdrv_aio_flush = qcow_aio_flush, |
c47c33b0 | 952 | .bdrv_write_compressed = qcow_write_compressed, |
e60f469c | 953 | .bdrv_get_info = qcow_get_info, |
0e7e1989 KW |
954 | |
955 | .create_options = qcow_create_options, | |
ea2384d3 | 956 | }; |
5efa9d5a AL |
957 | |
958 | static void bdrv_qcow_init(void) | |
959 | { | |
960 | bdrv_register(&bdrv_qcow); | |
961 | } | |
962 | ||
963 | block_init(bdrv_qcow_init); |