1 | /* |
2 | * Block driver for the QCOW format |
3 | * |
4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5 | * |
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 | */ |
24 | |
25 | #include "qemu/osdep.h" |
26 | #include "qapi/error.h" |
27 | #include "qemu/error-report.h" |
28 | #include "block/block_int.h" |
29 | #include "block/qdict.h" |
30 | #include "sysemu/block-backend.h" |
31 | #include "qemu/module.h" |
32 | #include "qemu/option.h" |
33 | #include "qemu/bswap.h" |
34 | #include "qemu/cutils.h" |
35 | #include <zlib.h> |
36 | #include "qapi/qmp/qdict.h" |
37 | #include "qapi/qmp/qstring.h" |
38 | #include "qapi/qobject-input-visitor.h" |
39 | #include "qapi/qapi-visit-block-core.h" |
40 | #include "crypto/block.h" |
41 | #include "migration/blocker.h" |
42 | #include "crypto.h" |
43 | |
44 | /**************************************************************/ |
45 | /* QEMU COW block driver with compression and encryption support */ |
46 | |
47 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
48 | #define QCOW_VERSION 1 |
49 | |
50 | #define QCOW_CRYPT_NONE 0 |
51 | #define QCOW_CRYPT_AES 1 |
52 | |
53 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) |
54 | |
55 | typedef struct { |
56 | uint32_t ; |
57 | uint32_t ; |
58 | uint64_t ; |
59 | uint32_t ; |
60 | uint32_t ; |
61 | uint64_t ; /* in bytes */ |
62 | uint8_t ; |
63 | uint8_t ; |
64 | uint16_t ; |
65 | uint32_t ; |
66 | uint64_t ; |
67 | } QEMU_PACKED ; |
68 | |
69 | #define L2_CACHE_SIZE 16 |
70 | |
71 | typedef struct BDRVQcowState { |
72 | int cluster_bits; |
73 | int cluster_size; |
74 | int l2_bits; |
75 | int l2_size; |
76 | unsigned int l1_size; |
77 | uint64_t cluster_offset_mask; |
78 | uint64_t l1_table_offset; |
79 | uint64_t *l1_table; |
80 | uint64_t *l2_cache; |
81 | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; |
82 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
83 | uint8_t *cluster_cache; |
84 | uint8_t *cluster_data; |
85 | uint64_t cluster_cache_offset; |
86 | QCryptoBlock *crypto; /* Disk encryption format driver */ |
87 | uint32_t ; |
88 | CoMutex lock; |
89 | Error *migration_blocker; |
90 | } BDRVQcowState; |
91 | |
92 | static QemuOptsList qcow_create_opts; |
93 | |
94 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
95 | |
96 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
97 | { |
98 | const QCowHeader * = (const void *)buf; |
99 | |
100 | if (buf_size >= sizeof(QCowHeader) && |
101 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
102 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
103 | return 100; |
104 | else |
105 | return 0; |
106 | } |
107 | |
108 | static QemuOptsList qcow_runtime_opts = { |
109 | .name = "qcow" , |
110 | .head = QTAILQ_HEAD_INITIALIZER(qcow_runtime_opts.head), |
111 | .desc = { |
112 | BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt." ), |
113 | { /* end of list */ } |
114 | }, |
115 | }; |
116 | |
117 | static int qcow_open(BlockDriverState *bs, QDict *options, int flags, |
118 | Error **errp) |
119 | { |
120 | BDRVQcowState *s = bs->opaque; |
121 | unsigned int len, i, shift; |
122 | int ret; |
123 | QCowHeader ; |
124 | Error *local_err = NULL; |
125 | QCryptoBlockOpenOptions *crypto_opts = NULL; |
126 | unsigned int cflags = 0; |
127 | QDict *encryptopts = NULL; |
128 | const char *encryptfmt; |
129 | |
130 | qdict_extract_subqdict(options, &encryptopts, "encrypt." ); |
131 | encryptfmt = qdict_get_try_str(encryptopts, "format" ); |
132 | |
133 | bs->file = bdrv_open_child(NULL, options, "file" , bs, &child_file, |
134 | false, errp); |
135 | if (!bs->file) { |
136 | ret = -EINVAL; |
137 | goto fail; |
138 | } |
139 | |
140 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
141 | if (ret < 0) { |
142 | goto fail; |
143 | } |
144 | header.magic = be32_to_cpu(header.magic); |
145 | header.version = be32_to_cpu(header.version); |
146 | header.backing_file_offset = be64_to_cpu(header.backing_file_offset); |
147 | header.backing_file_size = be32_to_cpu(header.backing_file_size); |
148 | header.mtime = be32_to_cpu(header.mtime); |
149 | header.size = be64_to_cpu(header.size); |
150 | header.crypt_method = be32_to_cpu(header.crypt_method); |
151 | header.l1_table_offset = be64_to_cpu(header.l1_table_offset); |
152 | |
153 | if (header.magic != QCOW_MAGIC) { |
154 | error_setg(errp, "Image not in qcow format" ); |
155 | ret = -EINVAL; |
156 | goto fail; |
157 | } |
158 | if (header.version != QCOW_VERSION) { |
159 | error_setg(errp, "qcow (v%d) does not support qcow version %" PRIu32, |
160 | QCOW_VERSION, header.version); |
161 | if (header.version == 2 || header.version == 3) { |
162 | error_append_hint(errp, "Try the 'qcow2' driver instead.\n" ); |
163 | } |
164 | |
165 | ret = -ENOTSUP; |
166 | goto fail; |
167 | } |
168 | |
169 | if (header.size <= 1) { |
170 | error_setg(errp, "Image size is too small (must be at least 2 bytes)" ); |
171 | ret = -EINVAL; |
172 | goto fail; |
173 | } |
174 | if (header.cluster_bits < 9 || header.cluster_bits > 16) { |
175 | error_setg(errp, "Cluster size must be between 512 and 64k" ); |
176 | ret = -EINVAL; |
177 | goto fail; |
178 | } |
179 | |
180 | /* l2_bits specifies number of entries; storing a uint64_t in each entry, |
181 | * so bytes = num_entries << 3. */ |
182 | if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) { |
183 | error_setg(errp, "L2 table size must be between 512 and 64k" ); |
184 | ret = -EINVAL; |
185 | goto fail; |
186 | } |
187 | |
188 | s->crypt_method_header = header.crypt_method; |
189 | if (s->crypt_method_header) { |
190 | if (bdrv_uses_whitelist() && |
191 | s->crypt_method_header == QCOW_CRYPT_AES) { |
192 | error_setg(errp, |
193 | "Use of AES-CBC encrypted qcow images is no longer " |
194 | "supported in system emulators" ); |
195 | error_append_hint(errp, |
196 | "You can use 'qemu-img convert' to convert your " |
197 | "image to an alternative supported format, such " |
198 | "as unencrypted qcow, or raw with the LUKS " |
199 | "format instead.\n" ); |
200 | ret = -ENOSYS; |
201 | goto fail; |
202 | } |
203 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
204 | if (encryptfmt && !g_str_equal(encryptfmt, "aes" )) { |
205 | error_setg(errp, |
206 | "Header reported 'aes' encryption format but " |
207 | "options specify '%s'" , encryptfmt); |
208 | ret = -EINVAL; |
209 | goto fail; |
210 | } |
211 | qdict_put_str(encryptopts, "format" , "qcow" ); |
212 | crypto_opts = block_crypto_open_opts_init(encryptopts, errp); |
213 | if (!crypto_opts) { |
214 | ret = -EINVAL; |
215 | goto fail; |
216 | } |
217 | |
218 | if (flags & BDRV_O_NO_IO) { |
219 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; |
220 | } |
221 | s->crypto = qcrypto_block_open(crypto_opts, "encrypt." , |
222 | NULL, NULL, cflags, 1, errp); |
223 | if (!s->crypto) { |
224 | ret = -EINVAL; |
225 | goto fail; |
226 | } |
227 | } else { |
228 | error_setg(errp, "invalid encryption method in qcow header" ); |
229 | ret = -EINVAL; |
230 | goto fail; |
231 | } |
232 | bs->encrypted = true; |
233 | } else { |
234 | if (encryptfmt) { |
235 | error_setg(errp, "No encryption in image header, but options " |
236 | "specified format '%s'" , encryptfmt); |
237 | ret = -EINVAL; |
238 | goto fail; |
239 | } |
240 | } |
241 | s->cluster_bits = header.cluster_bits; |
242 | s->cluster_size = 1 << s->cluster_bits; |
243 | s->l2_bits = header.l2_bits; |
244 | s->l2_size = 1 << s->l2_bits; |
245 | bs->total_sectors = header.size / 512; |
246 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; |
247 | |
248 | /* read the level 1 table */ |
249 | shift = s->cluster_bits + s->l2_bits; |
250 | if (header.size > UINT64_MAX - (1LL << shift)) { |
251 | error_setg(errp, "Image too large" ); |
252 | ret = -EINVAL; |
253 | goto fail; |
254 | } else { |
255 | uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; |
256 | if (l1_size > INT_MAX / sizeof(uint64_t)) { |
257 | error_setg(errp, "Image too large" ); |
258 | ret = -EINVAL; |
259 | goto fail; |
260 | } |
261 | s->l1_size = l1_size; |
262 | } |
263 | |
264 | s->l1_table_offset = header.l1_table_offset; |
265 | s->l1_table = g_try_new(uint64_t, s->l1_size); |
266 | if (s->l1_table == NULL) { |
267 | error_setg(errp, "Could not allocate memory for L1 table" ); |
268 | ret = -ENOMEM; |
269 | goto fail; |
270 | } |
271 | |
272 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
273 | s->l1_size * sizeof(uint64_t)); |
274 | if (ret < 0) { |
275 | goto fail; |
276 | } |
277 | |
278 | for(i = 0;i < s->l1_size; i++) { |
279 | s->l1_table[i] = be64_to_cpu(s->l1_table[i]); |
280 | } |
281 | |
282 | /* alloc L2 cache (max. 64k * 16 * 8 = 8 MB) */ |
283 | s->l2_cache = |
284 | qemu_try_blockalign(bs->file->bs, |
285 | s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
286 | if (s->l2_cache == NULL) { |
287 | error_setg(errp, "Could not allocate L2 table cache" ); |
288 | ret = -ENOMEM; |
289 | goto fail; |
290 | } |
291 | s->cluster_cache = g_malloc(s->cluster_size); |
292 | s->cluster_data = g_malloc(s->cluster_size); |
293 | s->cluster_cache_offset = -1; |
294 | |
295 | /* read the backing file name */ |
296 | if (header.backing_file_offset != 0) { |
297 | len = header.backing_file_size; |
298 | if (len > 1023 || len >= sizeof(bs->backing_file)) { |
299 | error_setg(errp, "Backing file name too long" ); |
300 | ret = -EINVAL; |
301 | goto fail; |
302 | } |
303 | ret = bdrv_pread(bs->file, header.backing_file_offset, |
304 | bs->auto_backing_file, len); |
305 | if (ret < 0) { |
306 | goto fail; |
307 | } |
308 | bs->auto_backing_file[len] = '\0'; |
309 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), |
310 | bs->auto_backing_file); |
311 | } |
312 | |
313 | /* Disable migration when qcow images are used */ |
314 | error_setg(&s->migration_blocker, "The qcow format used by node '%s' " |
315 | "does not support live migration" , |
316 | bdrv_get_device_or_node_name(bs)); |
317 | ret = migrate_add_blocker(s->migration_blocker, &local_err); |
318 | if (local_err) { |
319 | error_propagate(errp, local_err); |
320 | error_free(s->migration_blocker); |
321 | goto fail; |
322 | } |
323 | |
324 | qobject_unref(encryptopts); |
325 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
326 | qemu_co_mutex_init(&s->lock); |
327 | return 0; |
328 | |
329 | fail: |
330 | g_free(s->l1_table); |
331 | qemu_vfree(s->l2_cache); |
332 | g_free(s->cluster_cache); |
333 | g_free(s->cluster_data); |
334 | qcrypto_block_free(s->crypto); |
335 | qobject_unref(encryptopts); |
336 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
337 | return ret; |
338 | } |
339 | |
340 | |
341 | /* We have nothing to do for QCOW reopen, stubs just return |
342 | * success */ |
343 | static int qcow_reopen_prepare(BDRVReopenState *state, |
344 | BlockReopenQueue *queue, Error **errp) |
345 | { |
346 | return 0; |
347 | } |
348 | |
349 | |
350 | /* 'allocate' is: |
351 | * |
352 | * 0 to not allocate. |
353 | * |
354 | * 1 to allocate a normal cluster (for sector-aligned byte offsets 'n_start' |
355 | * to 'n_end' within the cluster) |
356 | * |
357 | * 2 to allocate a compressed cluster of size |
358 | * 'compressed_size'. 'compressed_size' must be > 0 and < |
359 | * cluster_size |
360 | * |
361 | * return 0 if not allocated, 1 if *result is assigned, and negative |
362 | * errno on failure. |
363 | */ |
364 | static int get_cluster_offset(BlockDriverState *bs, |
365 | uint64_t offset, int allocate, |
366 | int compressed_size, |
367 | int n_start, int n_end, uint64_t *result) |
368 | { |
369 | BDRVQcowState *s = bs->opaque; |
370 | int min_index, i, j, l1_index, l2_index, ret; |
371 | int64_t l2_offset; |
372 | uint64_t *l2_table, cluster_offset, tmp; |
373 | uint32_t min_count; |
374 | int new_l2_table; |
375 | |
376 | *result = 0; |
377 | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
378 | l2_offset = s->l1_table[l1_index]; |
379 | new_l2_table = 0; |
380 | if (!l2_offset) { |
381 | if (!allocate) |
382 | return 0; |
383 | /* allocate a new l2 entry */ |
384 | l2_offset = bdrv_getlength(bs->file->bs); |
385 | if (l2_offset < 0) { |
386 | return l2_offset; |
387 | } |
388 | /* round to cluster size */ |
389 | l2_offset = QEMU_ALIGN_UP(l2_offset, s->cluster_size); |
390 | /* update the L1 entry */ |
391 | s->l1_table[l1_index] = l2_offset; |
392 | tmp = cpu_to_be64(l2_offset); |
393 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); |
394 | ret = bdrv_pwrite_sync(bs->file, |
395 | s->l1_table_offset + l1_index * sizeof(tmp), |
396 | &tmp, sizeof(tmp)); |
397 | if (ret < 0) { |
398 | return ret; |
399 | } |
400 | new_l2_table = 1; |
401 | } |
402 | for(i = 0; i < L2_CACHE_SIZE; i++) { |
403 | if (l2_offset == s->l2_cache_offsets[i]) { |
404 | /* increment the hit count */ |
405 | if (++s->l2_cache_counts[i] == 0xffffffff) { |
406 | for(j = 0; j < L2_CACHE_SIZE; j++) { |
407 | s->l2_cache_counts[j] >>= 1; |
408 | } |
409 | } |
410 | l2_table = s->l2_cache + (i << s->l2_bits); |
411 | goto found; |
412 | } |
413 | } |
414 | /* not found: load a new entry in the least used one */ |
415 | min_index = 0; |
416 | min_count = 0xffffffff; |
417 | for(i = 0; i < L2_CACHE_SIZE; i++) { |
418 | if (s->l2_cache_counts[i] < min_count) { |
419 | min_count = s->l2_cache_counts[i]; |
420 | min_index = i; |
421 | } |
422 | } |
423 | l2_table = s->l2_cache + (min_index << s->l2_bits); |
424 | BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD); |
425 | if (new_l2_table) { |
426 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
427 | ret = bdrv_pwrite_sync(bs->file, l2_offset, l2_table, |
428 | s->l2_size * sizeof(uint64_t)); |
429 | if (ret < 0) { |
430 | return ret; |
431 | } |
432 | } else { |
433 | ret = bdrv_pread(bs->file, l2_offset, l2_table, |
434 | s->l2_size * sizeof(uint64_t)); |
435 | if (ret < 0) { |
436 | return ret; |
437 | } |
438 | } |
439 | s->l2_cache_offsets[min_index] = l2_offset; |
440 | s->l2_cache_counts[min_index] = 1; |
441 | found: |
442 | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); |
443 | cluster_offset = be64_to_cpu(l2_table[l2_index]); |
444 | if (!cluster_offset || |
445 | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { |
446 | if (!allocate) |
447 | return 0; |
448 | BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC); |
449 | assert(QEMU_IS_ALIGNED(n_start | n_end, BDRV_SECTOR_SIZE)); |
450 | /* allocate a new cluster */ |
451 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && |
452 | (n_end - n_start) < s->cluster_size) { |
453 | /* if the cluster is already compressed, we must |
454 | decompress it in the case it is not completely |
455 | overwritten */ |
456 | if (decompress_cluster(bs, cluster_offset) < 0) { |
457 | return -EIO; |
458 | } |
459 | cluster_offset = bdrv_getlength(bs->file->bs); |
460 | if ((int64_t) cluster_offset < 0) { |
461 | return cluster_offset; |
462 | } |
463 | cluster_offset = QEMU_ALIGN_UP(cluster_offset, s->cluster_size); |
464 | /* write the cluster content */ |
465 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
466 | ret = bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, |
467 | s->cluster_size); |
468 | if (ret < 0) { |
469 | return ret; |
470 | } |
471 | } else { |
472 | cluster_offset = bdrv_getlength(bs->file->bs); |
473 | if ((int64_t) cluster_offset < 0) { |
474 | return cluster_offset; |
475 | } |
476 | if (allocate == 1) { |
477 | /* round to cluster size */ |
478 | cluster_offset = QEMU_ALIGN_UP(cluster_offset, s->cluster_size); |
479 | if (cluster_offset + s->cluster_size > INT64_MAX) { |
480 | return -E2BIG; |
481 | } |
482 | ret = bdrv_truncate(bs->file, cluster_offset + s->cluster_size, |
483 | PREALLOC_MODE_OFF, NULL); |
484 | if (ret < 0) { |
485 | return ret; |
486 | } |
487 | /* if encrypted, we must initialize the cluster |
488 | content which won't be written */ |
489 | if (bs->encrypted && |
490 | (n_end - n_start) < s->cluster_size) { |
491 | uint64_t start_offset; |
492 | assert(s->crypto); |
493 | start_offset = offset & ~(s->cluster_size - 1); |
494 | for (i = 0; i < s->cluster_size; i += BDRV_SECTOR_SIZE) { |
495 | if (i < n_start || i >= n_end) { |
496 | memset(s->cluster_data, 0x00, BDRV_SECTOR_SIZE); |
497 | if (qcrypto_block_encrypt(s->crypto, |
498 | start_offset + i, |
499 | s->cluster_data, |
500 | BDRV_SECTOR_SIZE, |
501 | NULL) < 0) { |
502 | return -EIO; |
503 | } |
504 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
505 | ret = bdrv_pwrite(bs->file, |
506 | cluster_offset + i, |
507 | s->cluster_data, |
508 | BDRV_SECTOR_SIZE); |
509 | if (ret < 0) { |
510 | return ret; |
511 | } |
512 | } |
513 | } |
514 | } |
515 | } else if (allocate == 2) { |
516 | cluster_offset |= QCOW_OFLAG_COMPRESSED | |
517 | (uint64_t)compressed_size << (63 - s->cluster_bits); |
518 | } |
519 | } |
520 | /* update L2 table */ |
521 | tmp = cpu_to_be64(cluster_offset); |
522 | l2_table[l2_index] = tmp; |
523 | if (allocate == 2) { |
524 | BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED); |
525 | } else { |
526 | BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE); |
527 | } |
528 | ret = bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
529 | &tmp, sizeof(tmp)); |
530 | if (ret < 0) { |
531 | return ret; |
532 | } |
533 | } |
534 | *result = cluster_offset; |
535 | return 1; |
536 | } |
537 | |
538 | static int coroutine_fn qcow_co_block_status(BlockDriverState *bs, |
539 | bool want_zero, |
540 | int64_t offset, int64_t bytes, |
541 | int64_t *pnum, int64_t *map, |
542 | BlockDriverState **file) |
543 | { |
544 | BDRVQcowState *s = bs->opaque; |
545 | int index_in_cluster, ret; |
546 | int64_t n; |
547 | uint64_t cluster_offset; |
548 | |
549 | qemu_co_mutex_lock(&s->lock); |
550 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
551 | qemu_co_mutex_unlock(&s->lock); |
552 | if (ret < 0) { |
553 | return ret; |
554 | } |
555 | index_in_cluster = offset & (s->cluster_size - 1); |
556 | n = s->cluster_size - index_in_cluster; |
557 | if (n > bytes) { |
558 | n = bytes; |
559 | } |
560 | *pnum = n; |
561 | if (!cluster_offset) { |
562 | return 0; |
563 | } |
564 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypto) { |
565 | return BDRV_BLOCK_DATA; |
566 | } |
567 | *map = cluster_offset | index_in_cluster; |
568 | *file = bs->file->bs; |
569 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
570 | } |
571 | |
572 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, |
573 | const uint8_t *buf, int buf_size) |
574 | { |
575 | z_stream strm1, *strm = &strm1; |
576 | int ret, out_len; |
577 | |
578 | memset(strm, 0, sizeof(*strm)); |
579 | |
580 | strm->next_in = (uint8_t *)buf; |
581 | strm->avail_in = buf_size; |
582 | strm->next_out = out_buf; |
583 | strm->avail_out = out_buf_size; |
584 | |
585 | ret = inflateInit2(strm, -12); |
586 | if (ret != Z_OK) |
587 | return -1; |
588 | ret = inflate(strm, Z_FINISH); |
589 | out_len = strm->next_out - out_buf; |
590 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || |
591 | out_len != out_buf_size) { |
592 | inflateEnd(strm); |
593 | return -1; |
594 | } |
595 | inflateEnd(strm); |
596 | return 0; |
597 | } |
598 | |
599 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
600 | { |
601 | BDRVQcowState *s = bs->opaque; |
602 | int ret, csize; |
603 | uint64_t coffset; |
604 | |
605 | coffset = cluster_offset & s->cluster_offset_mask; |
606 | if (s->cluster_cache_offset != coffset) { |
607 | csize = cluster_offset >> (63 - s->cluster_bits); |
608 | csize &= (s->cluster_size - 1); |
609 | BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED); |
610 | ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize); |
611 | if (ret != csize) |
612 | return -1; |
613 | if (decompress_buffer(s->cluster_cache, s->cluster_size, |
614 | s->cluster_data, csize) < 0) { |
615 | return -1; |
616 | } |
617 | s->cluster_cache_offset = coffset; |
618 | } |
619 | return 0; |
620 | } |
621 | |
622 | static void qcow_refresh_limits(BlockDriverState *bs, Error **errp) |
623 | { |
624 | /* At least encrypted images require 512-byte alignment. Apply the |
625 | * limit universally, rather than just on encrypted images, as |
626 | * it's easier to let the block layer handle rounding than to |
627 | * audit this code further. */ |
628 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; |
629 | } |
630 | |
631 | static coroutine_fn int qcow_co_preadv(BlockDriverState *bs, uint64_t offset, |
632 | uint64_t bytes, QEMUIOVector *qiov, |
633 | int flags) |
634 | { |
635 | BDRVQcowState *s = bs->opaque; |
636 | int offset_in_cluster; |
637 | int ret = 0, n; |
638 | uint64_t cluster_offset; |
639 | uint8_t *buf; |
640 | void *orig_buf; |
641 | |
642 | assert(!flags); |
643 | if (qiov->niov > 1) { |
644 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
645 | if (buf == NULL) { |
646 | return -ENOMEM; |
647 | } |
648 | } else { |
649 | orig_buf = NULL; |
650 | buf = (uint8_t *)qiov->iov->iov_base; |
651 | } |
652 | |
653 | qemu_co_mutex_lock(&s->lock); |
654 | |
655 | while (bytes != 0) { |
656 | /* prepare next request */ |
657 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
658 | if (ret < 0) { |
659 | break; |
660 | } |
661 | offset_in_cluster = offset & (s->cluster_size - 1); |
662 | n = s->cluster_size - offset_in_cluster; |
663 | if (n > bytes) { |
664 | n = bytes; |
665 | } |
666 | |
667 | if (!cluster_offset) { |
668 | if (bs->backing) { |
669 | /* read from the base image */ |
670 | qemu_co_mutex_unlock(&s->lock); |
671 | /* qcow2 emits this on bs->file instead of bs->backing */ |
672 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
673 | ret = bdrv_co_pread(bs->backing, offset, n, buf, 0); |
674 | qemu_co_mutex_lock(&s->lock); |
675 | if (ret < 0) { |
676 | break; |
677 | } |
678 | } else { |
679 | /* Note: in this case, no need to wait */ |
680 | memset(buf, 0, n); |
681 | } |
682 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
683 | /* add AIO support for compressed blocks ? */ |
684 | if (decompress_cluster(bs, cluster_offset) < 0) { |
685 | ret = -EIO; |
686 | break; |
687 | } |
688 | memcpy(buf, s->cluster_cache + offset_in_cluster, n); |
689 | } else { |
690 | if ((cluster_offset & 511) != 0) { |
691 | ret = -EIO; |
692 | break; |
693 | } |
694 | qemu_co_mutex_unlock(&s->lock); |
695 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
696 | ret = bdrv_co_pread(bs->file, cluster_offset + offset_in_cluster, |
697 | n, buf, 0); |
698 | qemu_co_mutex_lock(&s->lock); |
699 | if (ret < 0) { |
700 | break; |
701 | } |
702 | if (bs->encrypted) { |
703 | assert(s->crypto); |
704 | if (qcrypto_block_decrypt(s->crypto, |
705 | offset, buf, n, NULL) < 0) { |
706 | ret = -EIO; |
707 | break; |
708 | } |
709 | } |
710 | } |
711 | ret = 0; |
712 | |
713 | bytes -= n; |
714 | offset += n; |
715 | buf += n; |
716 | } |
717 | |
718 | qemu_co_mutex_unlock(&s->lock); |
719 | |
720 | if (qiov->niov > 1) { |
721 | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); |
722 | qemu_vfree(orig_buf); |
723 | } |
724 | |
725 | return ret; |
726 | } |
727 | |
728 | static coroutine_fn int qcow_co_pwritev(BlockDriverState *bs, uint64_t offset, |
729 | uint64_t bytes, QEMUIOVector *qiov, |
730 | int flags) |
731 | { |
732 | BDRVQcowState *s = bs->opaque; |
733 | int offset_in_cluster; |
734 | uint64_t cluster_offset; |
735 | int ret = 0, n; |
736 | uint8_t *buf; |
737 | void *orig_buf; |
738 | |
739 | assert(!flags); |
740 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
741 | |
742 | /* We must always copy the iov when encrypting, so we |
743 | * don't modify the original data buffer during encryption */ |
744 | if (bs->encrypted || qiov->niov > 1) { |
745 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
746 | if (buf == NULL) { |
747 | return -ENOMEM; |
748 | } |
749 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
750 | } else { |
751 | orig_buf = NULL; |
752 | buf = (uint8_t *)qiov->iov->iov_base; |
753 | } |
754 | |
755 | qemu_co_mutex_lock(&s->lock); |
756 | |
757 | while (bytes != 0) { |
758 | offset_in_cluster = offset & (s->cluster_size - 1); |
759 | n = s->cluster_size - offset_in_cluster; |
760 | if (n > bytes) { |
761 | n = bytes; |
762 | } |
763 | ret = get_cluster_offset(bs, offset, 1, 0, offset_in_cluster, |
764 | offset_in_cluster + n, &cluster_offset); |
765 | if (ret < 0) { |
766 | break; |
767 | } |
768 | if (!cluster_offset || (cluster_offset & 511) != 0) { |
769 | ret = -EIO; |
770 | break; |
771 | } |
772 | if (bs->encrypted) { |
773 | assert(s->crypto); |
774 | if (qcrypto_block_encrypt(s->crypto, offset, buf, n, NULL) < 0) { |
775 | ret = -EIO; |
776 | break; |
777 | } |
778 | } |
779 | |
780 | qemu_co_mutex_unlock(&s->lock); |
781 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
782 | ret = bdrv_co_pwrite(bs->file, cluster_offset + offset_in_cluster, |
783 | n, buf, 0); |
784 | qemu_co_mutex_lock(&s->lock); |
785 | if (ret < 0) { |
786 | break; |
787 | } |
788 | ret = 0; |
789 | |
790 | bytes -= n; |
791 | offset += n; |
792 | buf += n; |
793 | } |
794 | qemu_co_mutex_unlock(&s->lock); |
795 | |
796 | qemu_vfree(orig_buf); |
797 | |
798 | return ret; |
799 | } |
800 | |
801 | static void qcow_close(BlockDriverState *bs) |
802 | { |
803 | BDRVQcowState *s = bs->opaque; |
804 | |
805 | qcrypto_block_free(s->crypto); |
806 | s->crypto = NULL; |
807 | g_free(s->l1_table); |
808 | qemu_vfree(s->l2_cache); |
809 | g_free(s->cluster_cache); |
810 | g_free(s->cluster_data); |
811 | |
812 | migrate_del_blocker(s->migration_blocker); |
813 | error_free(s->migration_blocker); |
814 | } |
815 | |
816 | static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts, |
817 | Error **errp) |
818 | { |
819 | BlockdevCreateOptionsQcow *qcow_opts; |
820 | int , backing_filename_len, l1_size, shift, i; |
821 | QCowHeader ; |
822 | uint8_t *tmp; |
823 | int64_t total_size = 0; |
824 | int ret; |
825 | BlockDriverState *bs; |
826 | BlockBackend *qcow_blk; |
827 | QCryptoBlock *crypto = NULL; |
828 | |
829 | assert(opts->driver == BLOCKDEV_DRIVER_QCOW); |
830 | qcow_opts = &opts->u.qcow; |
831 | |
832 | /* Sanity checks */ |
833 | total_size = qcow_opts->size; |
834 | if (total_size == 0) { |
835 | error_setg(errp, "Image size is too small, cannot be zero length" ); |
836 | return -EINVAL; |
837 | } |
838 | |
839 | if (qcow_opts->has_encrypt && |
840 | qcow_opts->encrypt->format != Q_CRYPTO_BLOCK_FORMAT_QCOW) |
841 | { |
842 | error_setg(errp, "Unsupported encryption format" ); |
843 | return -EINVAL; |
844 | } |
845 | |
846 | /* Create BlockBackend to write to the image */ |
847 | bs = bdrv_open_blockdev_ref(qcow_opts->file, errp); |
848 | if (bs == NULL) { |
849 | return -EIO; |
850 | } |
851 | |
852 | qcow_blk = blk_new(bdrv_get_aio_context(bs), |
853 | BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); |
854 | ret = blk_insert_bs(qcow_blk, bs, errp); |
855 | if (ret < 0) { |
856 | goto exit; |
857 | } |
858 | blk_set_allow_write_beyond_eof(qcow_blk, true); |
859 | |
860 | /* Create image format */ |
861 | ret = blk_truncate(qcow_blk, 0, PREALLOC_MODE_OFF, errp); |
862 | if (ret < 0) { |
863 | goto exit; |
864 | } |
865 | |
866 | memset(&header, 0, sizeof(header)); |
867 | header.magic = cpu_to_be32(QCOW_MAGIC); |
868 | header.version = cpu_to_be32(QCOW_VERSION); |
869 | header.size = cpu_to_be64(total_size); |
870 | header_size = sizeof(header); |
871 | backing_filename_len = 0; |
872 | if (qcow_opts->has_backing_file) { |
873 | if (strcmp(qcow_opts->backing_file, "fat:" )) { |
874 | header.backing_file_offset = cpu_to_be64(header_size); |
875 | backing_filename_len = strlen(qcow_opts->backing_file); |
876 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
877 | header_size += backing_filename_len; |
878 | } else { |
879 | /* special backing file for vvfat */ |
880 | qcow_opts->has_backing_file = false; |
881 | } |
882 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
883 | unmodified sectors */ |
884 | header.l2_bits = 12; /* 32 KB L2 tables */ |
885 | } else { |
886 | header.cluster_bits = 12; /* 4 KB clusters */ |
887 | header.l2_bits = 9; /* 4 KB L2 tables */ |
888 | } |
889 | header_size = (header_size + 7) & ~7; |
890 | shift = header.cluster_bits + header.l2_bits; |
891 | l1_size = (total_size + (1LL << shift) - 1) >> shift; |
892 | |
893 | header.l1_table_offset = cpu_to_be64(header_size); |
894 | |
895 | if (qcow_opts->has_encrypt) { |
896 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
897 | |
898 | crypto = qcrypto_block_create(qcow_opts->encrypt, "encrypt." , |
899 | NULL, NULL, NULL, errp); |
900 | if (!crypto) { |
901 | ret = -EINVAL; |
902 | goto exit; |
903 | } |
904 | } else { |
905 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
906 | } |
907 | |
908 | /* write all the data */ |
909 | ret = blk_pwrite(qcow_blk, 0, &header, sizeof(header), 0); |
910 | if (ret != sizeof(header)) { |
911 | goto exit; |
912 | } |
913 | |
914 | if (qcow_opts->has_backing_file) { |
915 | ret = blk_pwrite(qcow_blk, sizeof(header), |
916 | qcow_opts->backing_file, backing_filename_len, 0); |
917 | if (ret != backing_filename_len) { |
918 | goto exit; |
919 | } |
920 | } |
921 | |
922 | tmp = g_malloc0(BDRV_SECTOR_SIZE); |
923 | for (i = 0; i < DIV_ROUND_UP(sizeof(uint64_t) * l1_size, BDRV_SECTOR_SIZE); |
924 | i++) { |
925 | ret = blk_pwrite(qcow_blk, header_size + BDRV_SECTOR_SIZE * i, |
926 | tmp, BDRV_SECTOR_SIZE, 0); |
927 | if (ret != BDRV_SECTOR_SIZE) { |
928 | g_free(tmp); |
929 | goto exit; |
930 | } |
931 | } |
932 | |
933 | g_free(tmp); |
934 | ret = 0; |
935 | exit: |
936 | blk_unref(qcow_blk); |
937 | bdrv_unref(bs); |
938 | qcrypto_block_free(crypto); |
939 | return ret; |
940 | } |
941 | |
942 | static int coroutine_fn qcow_co_create_opts(const char *filename, |
943 | QemuOpts *opts, Error **errp) |
944 | { |
945 | BlockdevCreateOptions *create_options = NULL; |
946 | BlockDriverState *bs = NULL; |
947 | QDict *qdict; |
948 | Visitor *v; |
949 | const char *val; |
950 | Error *local_err = NULL; |
951 | int ret; |
952 | |
953 | static const QDictRenames opt_renames[] = { |
954 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, |
955 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, |
956 | { NULL, NULL }, |
957 | }; |
958 | |
959 | /* Parse options and convert legacy syntax */ |
960 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &qcow_create_opts, true); |
961 | |
962 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); |
963 | if (val && !strcmp(val, "on" )) { |
964 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow" ); |
965 | } else if (val && !strcmp(val, "off" )) { |
966 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); |
967 | } |
968 | |
969 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); |
970 | if (val && !strcmp(val, "aes" )) { |
971 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow" ); |
972 | } |
973 | |
974 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { |
975 | ret = -EINVAL; |
976 | goto fail; |
977 | } |
978 | |
979 | /* Create and open the file (protocol layer) */ |
980 | ret = bdrv_create_file(filename, opts, &local_err); |
981 | if (ret < 0) { |
982 | error_propagate(errp, local_err); |
983 | goto fail; |
984 | } |
985 | |
986 | bs = bdrv_open(filename, NULL, NULL, |
987 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); |
988 | if (bs == NULL) { |
989 | ret = -EIO; |
990 | goto fail; |
991 | } |
992 | |
993 | /* Now get the QAPI type BlockdevCreateOptions */ |
994 | qdict_put_str(qdict, "driver" , "qcow" ); |
995 | qdict_put_str(qdict, "file" , bs->node_name); |
996 | |
997 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
998 | if (!v) { |
999 | ret = -EINVAL; |
1000 | goto fail; |
1001 | } |
1002 | |
1003 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); |
1004 | visit_free(v); |
1005 | |
1006 | if (local_err) { |
1007 | error_propagate(errp, local_err); |
1008 | ret = -EINVAL; |
1009 | goto fail; |
1010 | } |
1011 | |
1012 | /* Silently round up size */ |
1013 | assert(create_options->driver == BLOCKDEV_DRIVER_QCOW); |
1014 | create_options->u.qcow.size = |
1015 | ROUND_UP(create_options->u.qcow.size, BDRV_SECTOR_SIZE); |
1016 | |
1017 | /* Create the qcow image (format layer) */ |
1018 | ret = qcow_co_create(create_options, errp); |
1019 | if (ret < 0) { |
1020 | goto fail; |
1021 | } |
1022 | |
1023 | ret = 0; |
1024 | fail: |
1025 | qobject_unref(qdict); |
1026 | bdrv_unref(bs); |
1027 | qapi_free_BlockdevCreateOptions(create_options); |
1028 | return ret; |
1029 | } |
1030 | |
1031 | static int qcow_make_empty(BlockDriverState *bs) |
1032 | { |
1033 | BDRVQcowState *s = bs->opaque; |
1034 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); |
1035 | int ret; |
1036 | |
1037 | memset(s->l1_table, 0, l1_length); |
1038 | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table, |
1039 | l1_length) < 0) |
1040 | return -1; |
1041 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length, |
1042 | PREALLOC_MODE_OFF, NULL); |
1043 | if (ret < 0) |
1044 | return ret; |
1045 | |
1046 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
1047 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); |
1048 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); |
1049 | |
1050 | return 0; |
1051 | } |
1052 | |
1053 | /* XXX: put compressed sectors first, then all the cluster aligned |
1054 | tables to avoid losing bytes in alignment */ |
1055 | static coroutine_fn int |
1056 | qcow_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, |
1057 | uint64_t bytes, QEMUIOVector *qiov) |
1058 | { |
1059 | BDRVQcowState *s = bs->opaque; |
1060 | z_stream strm; |
1061 | int ret, out_len; |
1062 | uint8_t *buf, *out_buf; |
1063 | uint64_t cluster_offset; |
1064 | |
1065 | buf = qemu_blockalign(bs, s->cluster_size); |
1066 | if (bytes != s->cluster_size) { |
1067 | if (bytes > s->cluster_size || |
1068 | offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) |
1069 | { |
1070 | qemu_vfree(buf); |
1071 | return -EINVAL; |
1072 | } |
1073 | /* Zero-pad last write if image size is not cluster aligned */ |
1074 | memset(buf + bytes, 0, s->cluster_size - bytes); |
1075 | } |
1076 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
1077 | |
1078 | out_buf = g_malloc(s->cluster_size); |
1079 | |
1080 | /* best compression, small window, no zlib header */ |
1081 | memset(&strm, 0, sizeof(strm)); |
1082 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
1083 | Z_DEFLATED, -12, |
1084 | 9, Z_DEFAULT_STRATEGY); |
1085 | if (ret != 0) { |
1086 | ret = -EINVAL; |
1087 | goto fail; |
1088 | } |
1089 | |
1090 | strm.avail_in = s->cluster_size; |
1091 | strm.next_in = (uint8_t *)buf; |
1092 | strm.avail_out = s->cluster_size; |
1093 | strm.next_out = out_buf; |
1094 | |
1095 | ret = deflate(&strm, Z_FINISH); |
1096 | if (ret != Z_STREAM_END && ret != Z_OK) { |
1097 | deflateEnd(&strm); |
1098 | ret = -EINVAL; |
1099 | goto fail; |
1100 | } |
1101 | out_len = strm.next_out - out_buf; |
1102 | |
1103 | deflateEnd(&strm); |
1104 | |
1105 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { |
1106 | /* could not compress: write normal cluster */ |
1107 | ret = qcow_co_pwritev(bs, offset, bytes, qiov, 0); |
1108 | if (ret < 0) { |
1109 | goto fail; |
1110 | } |
1111 | goto success; |
1112 | } |
1113 | qemu_co_mutex_lock(&s->lock); |
1114 | ret = get_cluster_offset(bs, offset, 2, out_len, 0, 0, &cluster_offset); |
1115 | qemu_co_mutex_unlock(&s->lock); |
1116 | if (ret < 0) { |
1117 | goto fail; |
1118 | } |
1119 | if (cluster_offset == 0) { |
1120 | ret = -EIO; |
1121 | goto fail; |
1122 | } |
1123 | cluster_offset &= s->cluster_offset_mask; |
1124 | |
1125 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
1126 | ret = bdrv_co_pwrite(bs->file, cluster_offset, out_len, out_buf, 0); |
1127 | if (ret < 0) { |
1128 | goto fail; |
1129 | } |
1130 | success: |
1131 | ret = 0; |
1132 | fail: |
1133 | qemu_vfree(buf); |
1134 | g_free(out_buf); |
1135 | return ret; |
1136 | } |
1137 | |
1138 | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1139 | { |
1140 | BDRVQcowState *s = bs->opaque; |
1141 | bdi->cluster_size = s->cluster_size; |
1142 | return 0; |
1143 | } |
1144 | |
1145 | static QemuOptsList qcow_create_opts = { |
1146 | .name = "qcow-create-opts" , |
1147 | .head = QTAILQ_HEAD_INITIALIZER(qcow_create_opts.head), |
1148 | .desc = { |
1149 | { |
1150 | .name = BLOCK_OPT_SIZE, |
1151 | .type = QEMU_OPT_SIZE, |
1152 | .help = "Virtual disk size" |
1153 | }, |
1154 | { |
1155 | .name = BLOCK_OPT_BACKING_FILE, |
1156 | .type = QEMU_OPT_STRING, |
1157 | .help = "File name of a base image" |
1158 | }, |
1159 | { |
1160 | .name = BLOCK_OPT_ENCRYPT, |
1161 | .type = QEMU_OPT_BOOL, |
1162 | .help = "Encrypt the image with format 'aes'. (Deprecated " |
1163 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)" , |
1164 | }, |
1165 | { |
1166 | .name = BLOCK_OPT_ENCRYPT_FORMAT, |
1167 | .type = QEMU_OPT_STRING, |
1168 | .help = "Encrypt the image, format choices: 'aes'" , |
1169 | }, |
1170 | BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt." ), |
1171 | { /* end of list */ } |
1172 | } |
1173 | }; |
1174 | |
1175 | static const char *const qcow_strong_runtime_opts[] = { |
1176 | "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET, |
1177 | |
1178 | NULL |
1179 | }; |
1180 | |
1181 | static BlockDriver bdrv_qcow = { |
1182 | .format_name = "qcow" , |
1183 | .instance_size = sizeof(BDRVQcowState), |
1184 | .bdrv_probe = qcow_probe, |
1185 | .bdrv_open = qcow_open, |
1186 | .bdrv_close = qcow_close, |
1187 | .bdrv_child_perm = bdrv_format_default_perms, |
1188 | .bdrv_reopen_prepare = qcow_reopen_prepare, |
1189 | .bdrv_co_create = qcow_co_create, |
1190 | .bdrv_co_create_opts = qcow_co_create_opts, |
1191 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
1192 | .supports_backing = true, |
1193 | .bdrv_refresh_limits = qcow_refresh_limits, |
1194 | |
1195 | .bdrv_co_preadv = qcow_co_preadv, |
1196 | .bdrv_co_pwritev = qcow_co_pwritev, |
1197 | .bdrv_co_block_status = qcow_co_block_status, |
1198 | |
1199 | .bdrv_make_empty = qcow_make_empty, |
1200 | .bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed, |
1201 | .bdrv_get_info = qcow_get_info, |
1202 | |
1203 | .create_opts = &qcow_create_opts, |
1204 | .strong_runtime_opts = qcow_strong_runtime_opts, |
1205 | }; |
1206 | |
1207 | static void bdrv_qcow_init(void) |
1208 | { |
1209 | bdrv_register(&bdrv_qcow); |
1210 | } |
1211 | |
1212 | block_init(bdrv_qcow_init); |
1213 | |