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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 | */ | |
80c71a24 | 24 | #include "qemu/osdep.h" |
faf07963 | 25 | #include "qemu-common.h" |
737e150e | 26 | #include "block/block_int.h" |
1de7afc9 | 27 | #include "qemu/module.h" |
28d34b82 | 28 | #include <zlib.h> |
cc7a8ea7 | 29 | #include "qapi/qmp/qerror.h" |
f6fa64f6 | 30 | #include "crypto/cipher.h" |
caf71f86 | 31 | #include "migration/migration.h" |
ea2384d3 FB |
32 | |
33 | /**************************************************************/ | |
34 | /* QEMU COW block driver with compression and encryption support */ | |
35 | ||
36 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) | |
37 | #define QCOW_VERSION 1 | |
38 | ||
39 | #define QCOW_CRYPT_NONE 0 | |
40 | #define QCOW_CRYPT_AES 1 | |
41 | ||
42 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) | |
43 | ||
44 | typedef struct QCowHeader { | |
45 | uint32_t magic; | |
46 | uint32_t version; | |
47 | uint64_t backing_file_offset; | |
48 | uint32_t backing_file_size; | |
49 | uint32_t mtime; | |
50 | uint64_t size; /* in bytes */ | |
51 | uint8_t cluster_bits; | |
52 | uint8_t l2_bits; | |
ea54feff | 53 | uint16_t padding; |
ea2384d3 FB |
54 | uint32_t crypt_method; |
55 | uint64_t l1_table_offset; | |
ea54feff | 56 | } QEMU_PACKED QCowHeader; |
ea2384d3 FB |
57 | |
58 | #define L2_CACHE_SIZE 16 | |
59 | ||
60 | typedef struct BDRVQcowState { | |
ea2384d3 FB |
61 | int cluster_bits; |
62 | int cluster_size; | |
63 | int cluster_sectors; | |
64 | int l2_bits; | |
65 | int l2_size; | |
46485de0 | 66 | unsigned int l1_size; |
ea2384d3 FB |
67 | uint64_t cluster_offset_mask; |
68 | uint64_t l1_table_offset; | |
69 | uint64_t *l1_table; | |
70 | uint64_t *l2_cache; | |
71 | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; | |
72 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
73 | uint8_t *cluster_cache; | |
74 | uint8_t *cluster_data; | |
75 | uint64_t cluster_cache_offset; | |
f6fa64f6 | 76 | QCryptoCipher *cipher; /* NULL if no key yet */ |
ea2384d3 | 77 | uint32_t crypt_method_header; |
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 | |
9a4f4c31 | 104 | ret = bdrv_pread(bs->file->bs, 0, &header, sizeof(header)); |
84b0ec02 | 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); | |
c6bd8c70 MA |
126 | error_setg(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
127 | bdrv_get_device_or_node_name(bs), "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 | } |
f6fa64f6 DB |
156 | if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128)) { |
157 | error_setg(errp, "AES cipher not available"); | |
158 | ret = -EINVAL; | |
159 | goto fail; | |
160 | } | |
ea2384d3 | 161 | s->crypt_method_header = header.crypt_method; |
84b0ec02 | 162 | if (s->crypt_method_header) { |
ea2384d3 | 163 | bs->encrypted = 1; |
84b0ec02 | 164 | } |
ea2384d3 FB |
165 | s->cluster_bits = header.cluster_bits; |
166 | s->cluster_size = 1 << s->cluster_bits; | |
167 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
168 | s->l2_bits = header.l2_bits; | |
169 | s->l2_size = 1 << s->l2_bits; | |
170 | bs->total_sectors = header.size / 512; | |
171 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; | |
172 | ||
173 | /* read the level 1 table */ | |
174 | shift = s->cluster_bits + s->l2_bits; | |
46485de0 KW |
175 | if (header.size > UINT64_MAX - (1LL << shift)) { |
176 | error_setg(errp, "Image too large"); | |
177 | ret = -EINVAL; | |
178 | goto fail; | |
179 | } else { | |
180 | uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; | |
181 | if (l1_size > INT_MAX / sizeof(uint64_t)) { | |
182 | error_setg(errp, "Image too large"); | |
183 | ret = -EINVAL; | |
184 | goto fail; | |
185 | } | |
186 | s->l1_size = l1_size; | |
187 | } | |
ea2384d3 FB |
188 | |
189 | s->l1_table_offset = header.l1_table_offset; | |
5839e53b | 190 | s->l1_table = g_try_new(uint64_t, s->l1_size); |
0df93305 KW |
191 | if (s->l1_table == NULL) { |
192 | error_setg(errp, "Could not allocate memory for L1 table"); | |
193 | ret = -ENOMEM; | |
194 | goto fail; | |
195 | } | |
84b0ec02 | 196 | |
9a4f4c31 | 197 | ret = bdrv_pread(bs->file->bs, s->l1_table_offset, s->l1_table, |
84b0ec02 LZH |
198 | s->l1_size * sizeof(uint64_t)); |
199 | if (ret < 0) { | |
ea2384d3 | 200 | goto fail; |
84b0ec02 LZH |
201 | } |
202 | ||
ea2384d3 FB |
203 | for(i = 0;i < s->l1_size; i++) { |
204 | be64_to_cpus(&s->l1_table[i]); | |
205 | } | |
0df93305 KW |
206 | |
207 | /* alloc L2 cache (max. 64k * 16 * 8 = 8 MB) */ | |
208 | s->l2_cache = | |
9a4f4c31 | 209 | qemu_try_blockalign(bs->file->bs, |
0df93305 KW |
210 | s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
211 | if (s->l2_cache == NULL) { | |
212 | error_setg(errp, "Could not allocate L2 table cache"); | |
213 | ret = -ENOMEM; | |
214 | goto fail; | |
215 | } | |
7267c094 | 216 | s->cluster_cache = g_malloc(s->cluster_size); |
7267c094 | 217 | s->cluster_data = g_malloc(s->cluster_size); |
ea2384d3 | 218 | s->cluster_cache_offset = -1; |
3b46e624 | 219 | |
ea2384d3 FB |
220 | /* read the backing file name */ |
221 | if (header.backing_file_offset != 0) { | |
222 | len = header.backing_file_size; | |
e729fa6a | 223 | if (len > 1023 || len >= sizeof(bs->backing_file)) { |
d66e5cee KW |
224 | error_setg(errp, "Backing file name too long"); |
225 | ret = -EINVAL; | |
226 | goto fail; | |
84b0ec02 | 227 | } |
9a4f4c31 | 228 | ret = bdrv_pread(bs->file->bs, header.backing_file_offset, |
84b0ec02 LZH |
229 | bs->backing_file, len); |
230 | if (ret < 0) { | |
ea2384d3 | 231 | goto fail; |
84b0ec02 | 232 | } |
ea2384d3 FB |
233 | bs->backing_file[len] = '\0'; |
234 | } | |
de33b1f3 | 235 | |
fd9f102c | 236 | /* Disable migration when qcow images are used */ |
81e5f78a AG |
237 | error_setg(&s->migration_blocker, "The qcow format used by node '%s' " |
238 | "does not support live migration", | |
239 | bdrv_get_device_or_node_name(bs)); | |
fd9f102c KW |
240 | migrate_add_blocker(s->migration_blocker); |
241 | ||
de33b1f3 | 242 | qemu_co_mutex_init(&s->lock); |
ea2384d3 FB |
243 | return 0; |
244 | ||
245 | fail: | |
7267c094 | 246 | g_free(s->l1_table); |
0df93305 | 247 | qemu_vfree(s->l2_cache); |
7267c094 AL |
248 | g_free(s->cluster_cache); |
249 | g_free(s->cluster_data); | |
84b0ec02 | 250 | return ret; |
ea2384d3 FB |
251 | } |
252 | ||
d177692e JC |
253 | |
254 | /* We have nothing to do for QCOW reopen, stubs just return | |
255 | * success */ | |
256 | static int qcow_reopen_prepare(BDRVReopenState *state, | |
257 | BlockReopenQueue *queue, Error **errp) | |
258 | { | |
259 | return 0; | |
260 | } | |
261 | ||
ea2384d3 FB |
262 | static int qcow_set_key(BlockDriverState *bs, const char *key) |
263 | { | |
264 | BDRVQcowState *s = bs->opaque; | |
265 | uint8_t keybuf[16]; | |
266 | int len, i; | |
f6fa64f6 | 267 | Error *err; |
3b46e624 | 268 | |
ea2384d3 FB |
269 | memset(keybuf, 0, 16); |
270 | len = strlen(key); | |
271 | if (len > 16) | |
272 | len = 16; | |
273 | /* XXX: we could compress the chars to 7 bits to increase | |
274 | entropy */ | |
275 | for(i = 0;i < len;i++) { | |
276 | keybuf[i] = key[i]; | |
277 | } | |
8336aafa | 278 | assert(bs->encrypted); |
ea2384d3 | 279 | |
f6fa64f6 DB |
280 | qcrypto_cipher_free(s->cipher); |
281 | s->cipher = qcrypto_cipher_new( | |
282 | QCRYPTO_CIPHER_ALG_AES_128, | |
283 | QCRYPTO_CIPHER_MODE_CBC, | |
284 | keybuf, G_N_ELEMENTS(keybuf), | |
285 | &err); | |
286 | ||
287 | if (!s->cipher) { | |
288 | /* XXX would be nice if errors in this method could | |
289 | * be properly propagate to the caller. Would need | |
290 | * the bdrv_set_key() API signature to be fixed. */ | |
291 | error_free(err); | |
ea2384d3 | 292 | return -1; |
f6fa64f6 | 293 | } |
ea2384d3 FB |
294 | return 0; |
295 | } | |
296 | ||
297 | /* The crypt function is compatible with the linux cryptoloop | |
298 | algorithm for < 4 GB images. NOTE: out_buf == in_buf is | |
299 | supported */ | |
f6fa64f6 DB |
300 | static int encrypt_sectors(BDRVQcowState *s, int64_t sector_num, |
301 | uint8_t *out_buf, const uint8_t *in_buf, | |
302 | int nb_sectors, bool enc, Error **errp) | |
ea2384d3 FB |
303 | { |
304 | union { | |
305 | uint64_t ll[2]; | |
306 | uint8_t b[16]; | |
307 | } ivec; | |
308 | int i; | |
f6fa64f6 | 309 | int ret; |
ea2384d3 FB |
310 | |
311 | for(i = 0; i < nb_sectors; i++) { | |
312 | ivec.ll[0] = cpu_to_le64(sector_num); | |
313 | ivec.ll[1] = 0; | |
f6fa64f6 DB |
314 | if (qcrypto_cipher_setiv(s->cipher, |
315 | ivec.b, G_N_ELEMENTS(ivec.b), | |
316 | errp) < 0) { | |
317 | return -1; | |
318 | } | |
319 | if (enc) { | |
320 | ret = qcrypto_cipher_encrypt(s->cipher, | |
321 | in_buf, | |
322 | out_buf, | |
323 | 512, | |
324 | errp); | |
325 | } else { | |
326 | ret = qcrypto_cipher_decrypt(s->cipher, | |
327 | in_buf, | |
328 | out_buf, | |
329 | 512, | |
330 | errp); | |
331 | } | |
332 | if (ret < 0) { | |
333 | return -1; | |
334 | } | |
ea2384d3 FB |
335 | sector_num++; |
336 | in_buf += 512; | |
337 | out_buf += 512; | |
338 | } | |
f6fa64f6 | 339 | return 0; |
ea2384d3 FB |
340 | } |
341 | ||
342 | /* 'allocate' is: | |
343 | * | |
344 | * 0 to not allocate. | |
345 | * | |
346 | * 1 to allocate a normal cluster (for sector indexes 'n_start' to | |
347 | * 'n_end') | |
348 | * | |
349 | * 2 to allocate a compressed cluster of size | |
350 | * 'compressed_size'. 'compressed_size' must be > 0 and < | |
5fafdf24 | 351 | * cluster_size |
ea2384d3 FB |
352 | * |
353 | * return 0 if not allocated. | |
354 | */ | |
355 | static uint64_t get_cluster_offset(BlockDriverState *bs, | |
356 | uint64_t offset, int allocate, | |
357 | int compressed_size, | |
358 | int n_start, int n_end) | |
359 | { | |
360 | BDRVQcowState *s = bs->opaque; | |
361 | int min_index, i, j, l1_index, l2_index; | |
362 | uint64_t l2_offset, *l2_table, cluster_offset, tmp; | |
363 | uint32_t min_count; | |
364 | int new_l2_table; | |
3b46e624 | 365 | |
ea2384d3 FB |
366 | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
367 | l2_offset = s->l1_table[l1_index]; | |
368 | new_l2_table = 0; | |
369 | if (!l2_offset) { | |
370 | if (!allocate) | |
371 | return 0; | |
372 | /* allocate a new l2 entry */ | |
9a4f4c31 | 373 | l2_offset = bdrv_getlength(bs->file->bs); |
ea2384d3 FB |
374 | /* round to cluster size */ |
375 | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); | |
376 | /* update the L1 entry */ | |
377 | s->l1_table[l1_index] = l2_offset; | |
378 | tmp = cpu_to_be64(l2_offset); | |
9a4f4c31 | 379 | if (bdrv_pwrite_sync(bs->file->bs, |
5e5557d9 KW |
380 | s->l1_table_offset + l1_index * sizeof(tmp), |
381 | &tmp, sizeof(tmp)) < 0) | |
ea2384d3 FB |
382 | return 0; |
383 | new_l2_table = 1; | |
384 | } | |
385 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
386 | if (l2_offset == s->l2_cache_offsets[i]) { | |
387 | /* increment the hit count */ | |
388 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
389 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
390 | s->l2_cache_counts[j] >>= 1; | |
391 | } | |
392 | } | |
393 | l2_table = s->l2_cache + (i << s->l2_bits); | |
394 | goto found; | |
395 | } | |
396 | } | |
397 | /* not found: load a new entry in the least used one */ | |
398 | min_index = 0; | |
399 | min_count = 0xffffffff; | |
400 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
401 | if (s->l2_cache_counts[i] < min_count) { | |
402 | min_count = s->l2_cache_counts[i]; | |
403 | min_index = i; | |
404 | } | |
405 | } | |
406 | l2_table = s->l2_cache + (min_index << s->l2_bits); | |
ea2384d3 FB |
407 | if (new_l2_table) { |
408 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); | |
9a4f4c31 | 409 | if (bdrv_pwrite_sync(bs->file->bs, l2_offset, l2_table, |
5e5557d9 | 410 | s->l2_size * sizeof(uint64_t)) < 0) |
ea2384d3 FB |
411 | return 0; |
412 | } else { | |
9a4f4c31 KW |
413 | if (bdrv_pread(bs->file->bs, l2_offset, l2_table, |
414 | s->l2_size * sizeof(uint64_t)) != | |
ea2384d3 FB |
415 | s->l2_size * sizeof(uint64_t)) |
416 | return 0; | |
417 | } | |
418 | s->l2_cache_offsets[min_index] = l2_offset; | |
419 | s->l2_cache_counts[min_index] = 1; | |
420 | found: | |
421 | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); | |
422 | cluster_offset = be64_to_cpu(l2_table[l2_index]); | |
5fafdf24 | 423 | if (!cluster_offset || |
ea2384d3 FB |
424 | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { |
425 | if (!allocate) | |
426 | return 0; | |
427 | /* allocate a new cluster */ | |
428 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && | |
429 | (n_end - n_start) < s->cluster_sectors) { | |
430 | /* if the cluster is already compressed, we must | |
431 | decompress it in the case it is not completely | |
432 | overwritten */ | |
66f82cee | 433 | if (decompress_cluster(bs, cluster_offset) < 0) |
ea2384d3 | 434 | return 0; |
9a4f4c31 | 435 | cluster_offset = bdrv_getlength(bs->file->bs); |
5fafdf24 | 436 | cluster_offset = (cluster_offset + s->cluster_size - 1) & |
ea2384d3 FB |
437 | ~(s->cluster_size - 1); |
438 | /* write the cluster content */ | |
9a4f4c31 KW |
439 | if (bdrv_pwrite(bs->file->bs, cluster_offset, s->cluster_cache, |
440 | s->cluster_size) != | |
ea2384d3 FB |
441 | s->cluster_size) |
442 | return -1; | |
443 | } else { | |
9a4f4c31 | 444 | cluster_offset = bdrv_getlength(bs->file->bs); |
7f48fa1f AL |
445 | if (allocate == 1) { |
446 | /* round to cluster size */ | |
447 | cluster_offset = (cluster_offset + s->cluster_size - 1) & | |
448 | ~(s->cluster_size - 1); | |
9a4f4c31 | 449 | bdrv_truncate(bs->file->bs, cluster_offset + s->cluster_size); |
7f48fa1f AL |
450 | /* if encrypted, we must initialize the cluster |
451 | content which won't be written */ | |
8336aafa | 452 | if (bs->encrypted && |
7f48fa1f AL |
453 | (n_end - n_start) < s->cluster_sectors) { |
454 | uint64_t start_sect; | |
f6fa64f6 | 455 | assert(s->cipher); |
7f48fa1f AL |
456 | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; |
457 | memset(s->cluster_data + 512, 0x00, 512); | |
458 | for(i = 0; i < s->cluster_sectors; i++) { | |
459 | if (i < n_start || i >= n_end) { | |
f6fa64f6 DB |
460 | Error *err = NULL; |
461 | if (encrypt_sectors(s, start_sect + i, | |
462 | s->cluster_data, | |
463 | s->cluster_data + 512, 1, | |
464 | true, &err) < 0) { | |
465 | error_free(err); | |
466 | errno = EIO; | |
467 | return -1; | |
468 | } | |
9a4f4c31 KW |
469 | if (bdrv_pwrite(bs->file->bs, |
470 | cluster_offset + i * 512, | |
7f48fa1f AL |
471 | s->cluster_data, 512) != 512) |
472 | return -1; | |
473 | } | |
ea2384d3 FB |
474 | } |
475 | } | |
7f48fa1f AL |
476 | } else if (allocate == 2) { |
477 | cluster_offset |= QCOW_OFLAG_COMPRESSED | | |
478 | (uint64_t)compressed_size << (63 - s->cluster_bits); | |
ea2384d3 FB |
479 | } |
480 | } | |
481 | /* update L2 table */ | |
482 | tmp = cpu_to_be64(cluster_offset); | |
483 | l2_table[l2_index] = tmp; | |
9a4f4c31 | 484 | if (bdrv_pwrite_sync(bs->file->bs, l2_offset + l2_index * sizeof(tmp), |
5e5557d9 | 485 | &tmp, sizeof(tmp)) < 0) |
ea2384d3 FB |
486 | return 0; |
487 | } | |
488 | return cluster_offset; | |
489 | } | |
490 | ||
b6b8a333 | 491 | static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs, |
67a0fd2a | 492 | int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) |
ea2384d3 FB |
493 | { |
494 | BDRVQcowState *s = bs->opaque; | |
495 | int index_in_cluster, n; | |
496 | uint64_t cluster_offset; | |
497 | ||
f8a2e5e3 | 498 | qemu_co_mutex_lock(&s->lock); |
ea2384d3 | 499 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
f8a2e5e3 | 500 | qemu_co_mutex_unlock(&s->lock); |
ea2384d3 FB |
501 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
502 | n = s->cluster_sectors - index_in_cluster; | |
503 | if (n > nb_sectors) | |
504 | n = nb_sectors; | |
505 | *pnum = n; | |
4bc74be9 PB |
506 | if (!cluster_offset) { |
507 | return 0; | |
508 | } | |
f6fa64f6 | 509 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->cipher) { |
4bc74be9 PB |
510 | return BDRV_BLOCK_DATA; |
511 | } | |
512 | cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); | |
3064bf6f | 513 | *file = bs->file->bs; |
4bc74be9 | 514 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | cluster_offset; |
ea2384d3 FB |
515 | } |
516 | ||
517 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, | |
518 | const uint8_t *buf, int buf_size) | |
519 | { | |
520 | z_stream strm1, *strm = &strm1; | |
521 | int ret, out_len; | |
522 | ||
523 | memset(strm, 0, sizeof(*strm)); | |
524 | ||
525 | strm->next_in = (uint8_t *)buf; | |
526 | strm->avail_in = buf_size; | |
527 | strm->next_out = out_buf; | |
528 | strm->avail_out = out_buf_size; | |
529 | ||
530 | ret = inflateInit2(strm, -12); | |
531 | if (ret != Z_OK) | |
532 | return -1; | |
533 | ret = inflate(strm, Z_FINISH); | |
534 | out_len = strm->next_out - out_buf; | |
535 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || | |
536 | out_len != out_buf_size) { | |
537 | inflateEnd(strm); | |
538 | return -1; | |
539 | } | |
540 | inflateEnd(strm); | |
541 | return 0; | |
542 | } | |
3b46e624 | 543 | |
66f82cee | 544 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
ea2384d3 | 545 | { |
66f82cee | 546 | BDRVQcowState *s = bs->opaque; |
ea2384d3 FB |
547 | int ret, csize; |
548 | uint64_t coffset; | |
549 | ||
550 | coffset = cluster_offset & s->cluster_offset_mask; | |
551 | if (s->cluster_cache_offset != coffset) { | |
552 | csize = cluster_offset >> (63 - s->cluster_bits); | |
553 | csize &= (s->cluster_size - 1); | |
9a4f4c31 | 554 | ret = bdrv_pread(bs->file->bs, coffset, s->cluster_data, csize); |
5fafdf24 | 555 | if (ret != csize) |
ea2384d3 FB |
556 | return -1; |
557 | if (decompress_buffer(s->cluster_cache, s->cluster_size, | |
558 | s->cluster_data, csize) < 0) { | |
559 | return -1; | |
560 | } | |
561 | s->cluster_cache_offset = coffset; | |
562 | } | |
563 | return 0; | |
564 | } | |
565 | ||
a968168c | 566 | static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, |
27deebe8 | 567 | int nb_sectors, QEMUIOVector *qiov) |
83f64091 | 568 | { |
83f64091 | 569 | BDRVQcowState *s = bs->opaque; |
83f64091 | 570 | int index_in_cluster; |
27deebe8 | 571 | int ret = 0, n; |
43ca85b5 | 572 | uint64_t cluster_offset; |
430bbaaa FZ |
573 | struct iovec hd_iov; |
574 | QEMUIOVector hd_qiov; | |
27deebe8 FZ |
575 | uint8_t *buf; |
576 | void *orig_buf; | |
f6fa64f6 | 577 | Error *err = NULL; |
83f64091 | 578 | |
27deebe8 | 579 | if (qiov->niov > 1) { |
0df93305 KW |
580 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
581 | if (buf == NULL) { | |
582 | return -ENOMEM; | |
583 | } | |
27deebe8 FZ |
584 | } else { |
585 | orig_buf = NULL; | |
586 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 587 | } |
3b46e624 | 588 | |
27deebe8 FZ |
589 | qemu_co_mutex_lock(&s->lock); |
590 | ||
591 | while (nb_sectors != 0) { | |
592 | /* prepare next request */ | |
593 | cluster_offset = get_cluster_offset(bs, sector_num << 9, | |
594 | 0, 0, 0, 0); | |
595 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
596 | n = s->cluster_sectors - index_in_cluster; | |
597 | if (n > nb_sectors) { | |
598 | n = nb_sectors; | |
599 | } | |
ce1a14dc | 600 | |
27deebe8 | 601 | if (!cluster_offset) { |
760e0063 | 602 | if (bs->backing) { |
27deebe8 FZ |
603 | /* read from the base image */ |
604 | hd_iov.iov_base = (void *)buf; | |
605 | hd_iov.iov_len = n * 512; | |
606 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); | |
607 | qemu_co_mutex_unlock(&s->lock); | |
760e0063 | 608 | ret = bdrv_co_readv(bs->backing->bs, sector_num, |
27deebe8 FZ |
609 | n, &hd_qiov); |
610 | qemu_co_mutex_lock(&s->lock); | |
611 | if (ret < 0) { | |
612 | goto fail; | |
613 | } | |
614 | } else { | |
615 | /* Note: in this case, no need to wait */ | |
616 | memset(buf, 0, 512 * n); | |
617 | } | |
618 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { | |
619 | /* add AIO support for compressed blocks ? */ | |
620 | if (decompress_cluster(bs, cluster_offset) < 0) { | |
621 | goto fail; | |
622 | } | |
623 | memcpy(buf, | |
624 | s->cluster_cache + index_in_cluster * 512, 512 * n); | |
625 | } else { | |
626 | if ((cluster_offset & 511) != 0) { | |
627 | goto fail; | |
628 | } | |
629 | hd_iov.iov_base = (void *)buf; | |
430bbaaa FZ |
630 | hd_iov.iov_len = n * 512; |
631 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); | |
52b8eb60 | 632 | qemu_co_mutex_unlock(&s->lock); |
9a4f4c31 | 633 | ret = bdrv_co_readv(bs->file->bs, |
27deebe8 | 634 | (cluster_offset >> 9) + index_in_cluster, |
430bbaaa | 635 | n, &hd_qiov); |
52b8eb60 KW |
636 | qemu_co_mutex_lock(&s->lock); |
637 | if (ret < 0) { | |
27deebe8 FZ |
638 | break; |
639 | } | |
8336aafa | 640 | if (bs->encrypted) { |
f6fa64f6 DB |
641 | assert(s->cipher); |
642 | if (encrypt_sectors(s, sector_num, buf, buf, | |
643 | n, false, &err) < 0) { | |
644 | goto fail; | |
645 | } | |
5614c188 | 646 | } |
5614c188 | 647 | } |
27deebe8 | 648 | ret = 0; |
f141eafe | 649 | |
27deebe8 FZ |
650 | nb_sectors -= n; |
651 | sector_num += n; | |
652 | buf += n * 512; | |
43ca85b5 FZ |
653 | } |
654 | ||
27deebe8 | 655 | done: |
52b8eb60 KW |
656 | qemu_co_mutex_unlock(&s->lock); |
657 | ||
27deebe8 | 658 | if (qiov->niov > 1) { |
03396148 | 659 | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); |
27deebe8 | 660 | qemu_vfree(orig_buf); |
b11a24de KW |
661 | } |
662 | ||
52b8eb60 | 663 | return ret; |
27deebe8 FZ |
664 | |
665 | fail: | |
f6fa64f6 | 666 | error_free(err); |
27deebe8 FZ |
667 | ret = -EIO; |
668 | goto done; | |
83f64091 FB |
669 | } |
670 | ||
a968168c | 671 | static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, |
27deebe8 | 672 | int nb_sectors, QEMUIOVector *qiov) |
83f64091 | 673 | { |
83f64091 | 674 | BDRVQcowState *s = bs->opaque; |
83f64091 FB |
675 | int index_in_cluster; |
676 | uint64_t cluster_offset; | |
677 | const uint8_t *src_buf; | |
27deebe8 | 678 | int ret = 0, n; |
430bbaaa FZ |
679 | uint8_t *cluster_data = NULL; |
680 | struct iovec hd_iov; | |
681 | QEMUIOVector hd_qiov; | |
27deebe8 FZ |
682 | uint8_t *buf; |
683 | void *orig_buf; | |
ce1a14dc | 684 | |
27deebe8 | 685 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
3b46e624 | 686 | |
27deebe8 | 687 | if (qiov->niov > 1) { |
0df93305 KW |
688 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
689 | if (buf == NULL) { | |
690 | return -ENOMEM; | |
691 | } | |
d5e6b161 | 692 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
83f64091 | 693 | } else { |
27deebe8 FZ |
694 | orig_buf = NULL; |
695 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 696 | } |
c87c0672 | 697 | |
52b8eb60 | 698 | qemu_co_mutex_lock(&s->lock); |
43ca85b5 | 699 | |
27deebe8 | 700 | while (nb_sectors != 0) { |
83f64091 | 701 | |
27deebe8 FZ |
702 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
703 | n = s->cluster_sectors - index_in_cluster; | |
704 | if (n > nb_sectors) { | |
705 | n = nb_sectors; | |
706 | } | |
707 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0, | |
708 | index_in_cluster, | |
709 | index_in_cluster + n); | |
710 | if (!cluster_offset || (cluster_offset & 511) != 0) { | |
711 | ret = -EIO; | |
712 | break; | |
713 | } | |
8336aafa | 714 | if (bs->encrypted) { |
f6fa64f6 DB |
715 | Error *err = NULL; |
716 | assert(s->cipher); | |
27deebe8 FZ |
717 | if (!cluster_data) { |
718 | cluster_data = g_malloc0(s->cluster_size); | |
719 | } | |
f6fa64f6 DB |
720 | if (encrypt_sectors(s, sector_num, cluster_data, buf, |
721 | n, true, &err) < 0) { | |
722 | error_free(err); | |
723 | ret = -EIO; | |
724 | break; | |
725 | } | |
27deebe8 FZ |
726 | src_buf = cluster_data; |
727 | } else { | |
728 | src_buf = buf; | |
729 | } | |
83f64091 | 730 | |
27deebe8 FZ |
731 | hd_iov.iov_base = (void *)src_buf; |
732 | hd_iov.iov_len = n * 512; | |
733 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); | |
734 | qemu_co_mutex_unlock(&s->lock); | |
9a4f4c31 | 735 | ret = bdrv_co_writev(bs->file->bs, |
27deebe8 FZ |
736 | (cluster_offset >> 9) + index_in_cluster, |
737 | n, &hd_qiov); | |
738 | qemu_co_mutex_lock(&s->lock); | |
739 | if (ret < 0) { | |
740 | break; | |
741 | } | |
742 | ret = 0; | |
ad53089b | 743 | |
27deebe8 FZ |
744 | nb_sectors -= n; |
745 | sector_num += n; | |
746 | buf += n * 512; | |
747 | } | |
52b8eb60 | 748 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 749 | |
27deebe8 FZ |
750 | if (qiov->niov > 1) { |
751 | qemu_vfree(orig_buf); | |
b11a24de | 752 | } |
add8d262 | 753 | g_free(cluster_data); |
b11a24de | 754 | |
52b8eb60 | 755 | return ret; |
83f64091 FB |
756 | } |
757 | ||
e2731add | 758 | static void qcow_close(BlockDriverState *bs) |
ea2384d3 FB |
759 | { |
760 | BDRVQcowState *s = bs->opaque; | |
fd9f102c | 761 | |
f6fa64f6 DB |
762 | qcrypto_cipher_free(s->cipher); |
763 | s->cipher = NULL; | |
7267c094 | 764 | g_free(s->l1_table); |
0df93305 | 765 | qemu_vfree(s->l2_cache); |
7267c094 AL |
766 | g_free(s->cluster_cache); |
767 | g_free(s->cluster_data); | |
fd9f102c KW |
768 | |
769 | migrate_del_blocker(s->migration_blocker); | |
770 | error_free(s->migration_blocker); | |
ea2384d3 FB |
771 | } |
772 | ||
16d12159 | 773 | static int qcow_create(const char *filename, QemuOpts *opts, Error **errp) |
ea2384d3 | 774 | { |
2b16c9ff | 775 | int header_size, backing_filename_len, l1_size, shift, i; |
ea2384d3 | 776 | QCowHeader header; |
2b16c9ff | 777 | uint8_t *tmp; |
0e7e1989 | 778 | int64_t total_size = 0; |
16d12159 | 779 | char *backing_file = NULL; |
0e7e1989 | 780 | int flags = 0; |
34b5d2c6 | 781 | Error *local_err = NULL; |
3e1a8134 | 782 | int ret; |
2b16c9ff | 783 | BlockDriverState *qcow_bs; |
0e7e1989 KW |
784 | |
785 | /* Read out options */ | |
180e9526 HT |
786 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
787 | BDRV_SECTOR_SIZE); | |
16d12159 CL |
788 | backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); |
789 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) { | |
790 | flags |= BLOCK_FLAG_ENCRYPT; | |
0e7e1989 | 791 | } |
ea2384d3 | 792 | |
c282e1fd | 793 | ret = bdrv_create_file(filename, opts, &local_err); |
2b16c9ff | 794 | if (ret < 0) { |
b6d5066d | 795 | error_propagate(errp, local_err); |
16d12159 | 796 | goto cleanup; |
2b16c9ff LZH |
797 | } |
798 | ||
2e40134b HR |
799 | qcow_bs = NULL; |
800 | ret = bdrv_open(&qcow_bs, filename, NULL, NULL, | |
6ebf9aa2 | 801 | BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); |
2b16c9ff | 802 | if (ret < 0) { |
b6d5066d | 803 | error_propagate(errp, local_err); |
16d12159 | 804 | goto cleanup; |
2b16c9ff LZH |
805 | } |
806 | ||
807 | ret = bdrv_truncate(qcow_bs, 0); | |
808 | if (ret < 0) { | |
809 | goto exit; | |
810 | } | |
811 | ||
ea2384d3 FB |
812 | memset(&header, 0, sizeof(header)); |
813 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
814 | header.version = cpu_to_be32(QCOW_VERSION); | |
180e9526 | 815 | header.size = cpu_to_be64(total_size); |
ea2384d3 FB |
816 | header_size = sizeof(header); |
817 | backing_filename_len = 0; | |
818 | if (backing_file) { | |
7852e5da AJ |
819 | if (strcmp(backing_file, "fat:")) { |
820 | header.backing_file_offset = cpu_to_be64(header_size); | |
821 | backing_filename_len = strlen(backing_file); | |
822 | header.backing_file_size = cpu_to_be32(backing_filename_len); | |
823 | header_size += backing_filename_len; | |
824 | } else { | |
825 | /* special backing file for vvfat */ | |
826 | backing_file = NULL; | |
827 | } | |
ea2384d3 | 828 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
dc6fb73d | 829 | unmodified sectors */ |
ea2384d3 FB |
830 | header.l2_bits = 12; /* 32 KB L2 tables */ |
831 | } else { | |
832 | header.cluster_bits = 12; /* 4 KB clusters */ | |
833 | header.l2_bits = 9; /* 4 KB L2 tables */ | |
834 | } | |
835 | header_size = (header_size + 7) & ~7; | |
836 | shift = header.cluster_bits + header.l2_bits; | |
180e9526 | 837 | l1_size = (total_size + (1LL << shift) - 1) >> shift; |
ea2384d3 FB |
838 | |
839 | header.l1_table_offset = cpu_to_be64(header_size); | |
ec36ba14 | 840 | if (flags & BLOCK_FLAG_ENCRYPT) { |
ea2384d3 FB |
841 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
842 | } else { | |
843 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
844 | } | |
3b46e624 | 845 | |
ea2384d3 | 846 | /* write all the data */ |
2b16c9ff | 847 | ret = bdrv_pwrite(qcow_bs, 0, &header, sizeof(header)); |
3e1a8134 | 848 | if (ret != sizeof(header)) { |
3e1a8134 KS |
849 | goto exit; |
850 | } | |
851 | ||
ea2384d3 | 852 | if (backing_file) { |
2b16c9ff LZH |
853 | ret = bdrv_pwrite(qcow_bs, sizeof(header), |
854 | backing_file, backing_filename_len); | |
3e1a8134 | 855 | if (ret != backing_filename_len) { |
3e1a8134 KS |
856 | goto exit; |
857 | } | |
ea2384d3 | 858 | } |
2b16c9ff LZH |
859 | |
860 | tmp = g_malloc0(BDRV_SECTOR_SIZE); | |
861 | for (i = 0; i < ((sizeof(uint64_t)*l1_size + BDRV_SECTOR_SIZE - 1)/ | |
862 | BDRV_SECTOR_SIZE); i++) { | |
863 | ret = bdrv_pwrite(qcow_bs, header_size + | |
864 | BDRV_SECTOR_SIZE*i, tmp, BDRV_SECTOR_SIZE); | |
865 | if (ret != BDRV_SECTOR_SIZE) { | |
866 | g_free(tmp); | |
3e1a8134 KS |
867 | goto exit; |
868 | } | |
ea2384d3 | 869 | } |
3e1a8134 | 870 | |
2b16c9ff | 871 | g_free(tmp); |
3e1a8134 KS |
872 | ret = 0; |
873 | exit: | |
4f6fd349 | 874 | bdrv_unref(qcow_bs); |
16d12159 CL |
875 | cleanup: |
876 | g_free(backing_file); | |
3e1a8134 | 877 | return ret; |
ea2384d3 FB |
878 | } |
879 | ||
c47c33b0 | 880 | static int qcow_make_empty(BlockDriverState *bs) |
95389c86 FB |
881 | { |
882 | BDRVQcowState *s = bs->opaque; | |
883 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
83f64091 | 884 | int ret; |
95389c86 FB |
885 | |
886 | memset(s->l1_table, 0, l1_length); | |
9a4f4c31 | 887 | if (bdrv_pwrite_sync(bs->file->bs, s->l1_table_offset, s->l1_table, |
5e5557d9 KW |
888 | l1_length) < 0) |
889 | return -1; | |
9a4f4c31 | 890 | ret = bdrv_truncate(bs->file->bs, s->l1_table_offset + l1_length); |
83f64091 FB |
891 | if (ret < 0) |
892 | return ret; | |
95389c86 FB |
893 | |
894 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); | |
895 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); | |
896 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
ea2384d3 FB |
901 | /* XXX: put compressed sectors first, then all the cluster aligned |
902 | tables to avoid losing bytes in alignment */ | |
5fafdf24 | 903 | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
c47c33b0 | 904 | const uint8_t *buf, int nb_sectors) |
ea2384d3 FB |
905 | { |
906 | BDRVQcowState *s = bs->opaque; | |
907 | z_stream strm; | |
908 | int ret, out_len; | |
909 | uint8_t *out_buf; | |
910 | uint64_t cluster_offset; | |
911 | ||
16b3c5cd SH |
912 | if (nb_sectors != s->cluster_sectors) { |
913 | ret = -EINVAL; | |
914 | ||
915 | /* Zero-pad last write if image size is not cluster aligned */ | |
916 | if (sector_num + nb_sectors == bs->total_sectors && | |
917 | nb_sectors < s->cluster_sectors) { | |
918 | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); | |
919 | memset(pad_buf, 0, s->cluster_size); | |
920 | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); | |
921 | ret = qcow_write_compressed(bs, sector_num, | |
922 | pad_buf, s->cluster_sectors); | |
923 | qemu_vfree(pad_buf); | |
924 | } | |
925 | return ret; | |
926 | } | |
ea2384d3 | 927 | |
7267c094 | 928 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
ea2384d3 FB |
929 | |
930 | /* best compression, small window, no zlib header */ | |
931 | memset(&strm, 0, sizeof(strm)); | |
932 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
5fafdf24 | 933 | Z_DEFLATED, -12, |
ea2384d3 FB |
934 | 9, Z_DEFAULT_STRATEGY); |
935 | if (ret != 0) { | |
64ebe71a KW |
936 | ret = -EINVAL; |
937 | goto fail; | |
ea2384d3 FB |
938 | } |
939 | ||
940 | strm.avail_in = s->cluster_size; | |
941 | strm.next_in = (uint8_t *)buf; | |
942 | strm.avail_out = s->cluster_size; | |
943 | strm.next_out = out_buf; | |
944 | ||
945 | ret = deflate(&strm, Z_FINISH); | |
946 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
ea2384d3 | 947 | deflateEnd(&strm); |
64ebe71a KW |
948 | ret = -EINVAL; |
949 | goto fail; | |
ea2384d3 FB |
950 | } |
951 | out_len = strm.next_out - out_buf; | |
952 | ||
953 | deflateEnd(&strm); | |
954 | ||
955 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
956 | /* could not compress: write normal cluster */ | |
64ebe71a KW |
957 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
958 | if (ret < 0) { | |
959 | goto fail; | |
960 | } | |
ea2384d3 | 961 | } else { |
5fafdf24 | 962 | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
ea2384d3 | 963 | out_len, 0, 0); |
64ebe71a KW |
964 | if (cluster_offset == 0) { |
965 | ret = -EIO; | |
966 | goto fail; | |
967 | } | |
968 | ||
ea2384d3 | 969 | cluster_offset &= s->cluster_offset_mask; |
9a4f4c31 | 970 | ret = bdrv_pwrite(bs->file->bs, cluster_offset, out_buf, out_len); |
64ebe71a KW |
971 | if (ret < 0) { |
972 | goto fail; | |
ea2384d3 FB |
973 | } |
974 | } | |
3b46e624 | 975 | |
64ebe71a KW |
976 | ret = 0; |
977 | fail: | |
7267c094 | 978 | g_free(out_buf); |
64ebe71a | 979 | return ret; |
ea2384d3 FB |
980 | } |
981 | ||
c47c33b0 FB |
982 | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
983 | { | |
984 | BDRVQcowState *s = bs->opaque; | |
985 | bdi->cluster_size = s->cluster_size; | |
986 | return 0; | |
987 | } | |
988 | ||
16d12159 CL |
989 | static QemuOptsList qcow_create_opts = { |
990 | .name = "qcow-create-opts", | |
991 | .head = QTAILQ_HEAD_INITIALIZER(qcow_create_opts.head), | |
992 | .desc = { | |
993 | { | |
994 | .name = BLOCK_OPT_SIZE, | |
995 | .type = QEMU_OPT_SIZE, | |
996 | .help = "Virtual disk size" | |
997 | }, | |
998 | { | |
999 | .name = BLOCK_OPT_BACKING_FILE, | |
1000 | .type = QEMU_OPT_STRING, | |
1001 | .help = "File name of a base image" | |
1002 | }, | |
1003 | { | |
1004 | .name = BLOCK_OPT_ENCRYPT, | |
1005 | .type = QEMU_OPT_BOOL, | |
1006 | .help = "Encrypt the image", | |
1007 | .def_value_str = "off" | |
1008 | }, | |
1009 | { /* end of list */ } | |
1010 | } | |
0e7e1989 KW |
1011 | }; |
1012 | ||
5efa9d5a | 1013 | static BlockDriver bdrv_qcow = { |
e60f469c AJ |
1014 | .format_name = "qcow", |
1015 | .instance_size = sizeof(BDRVQcowState), | |
1016 | .bdrv_probe = qcow_probe, | |
1017 | .bdrv_open = qcow_open, | |
1018 | .bdrv_close = qcow_close, | |
16d12159 | 1019 | .bdrv_reopen_prepare = qcow_reopen_prepare, |
c282e1fd | 1020 | .bdrv_create = qcow_create, |
3ac21627 | 1021 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
8ee79e70 | 1022 | .supports_backing = true, |
c68b89ac KW |
1023 | |
1024 | .bdrv_co_readv = qcow_co_readv, | |
1025 | .bdrv_co_writev = qcow_co_writev, | |
b6b8a333 | 1026 | .bdrv_co_get_block_status = qcow_co_get_block_status, |
c68b89ac KW |
1027 | |
1028 | .bdrv_set_key = qcow_set_key, | |
1029 | .bdrv_make_empty = qcow_make_empty, | |
1030 | .bdrv_write_compressed = qcow_write_compressed, | |
1031 | .bdrv_get_info = qcow_get_info, | |
0e7e1989 | 1032 | |
16d12159 | 1033 | .create_opts = &qcow_create_opts, |
ea2384d3 | 1034 | }; |
5efa9d5a AL |
1035 | |
1036 | static void bdrv_qcow_init(void) | |
1037 | { | |
1038 | bdrv_register(&bdrv_qcow); | |
1039 | } | |
1040 | ||
1041 | block_init(bdrv_qcow_init); |