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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 | */ | |
452fcdbc | 24 | |
80c71a24 | 25 | #include "qemu/osdep.h" |
da34e65c | 26 | #include "qapi/error.h" |
e6ff69bf | 27 | #include "qemu/error-report.h" |
737e150e | 28 | #include "block/block_int.h" |
609f45ea | 29 | #include "block/qdict.h" |
6af40160 | 30 | #include "sysemu/block-backend.h" |
1de7afc9 | 31 | #include "qemu/module.h" |
922a01a0 | 32 | #include "qemu/option.h" |
58369e22 | 33 | #include "qemu/bswap.h" |
28d34b82 | 34 | #include <zlib.h> |
452fcdbc | 35 | #include "qapi/qmp/qdict.h" |
d85f4222 | 36 | #include "qapi/qmp/qstring.h" |
42a3e1ab KW |
37 | #include "qapi/qobject-input-visitor.h" |
38 | #include "qapi/qapi-visit-block-core.h" | |
d85f4222 | 39 | #include "crypto/block.h" |
795c40b8 | 40 | #include "migration/blocker.h" |
0d8c41da | 41 | #include "crypto.h" |
ea2384d3 FB |
42 | |
43 | /**************************************************************/ | |
44 | /* QEMU COW block driver with compression and encryption support */ | |
45 | ||
46 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) | |
47 | #define QCOW_VERSION 1 | |
48 | ||
49 | #define QCOW_CRYPT_NONE 0 | |
50 | #define QCOW_CRYPT_AES 1 | |
51 | ||
52 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) | |
53 | ||
54 | typedef struct QCowHeader { | |
55 | uint32_t magic; | |
56 | uint32_t version; | |
57 | uint64_t backing_file_offset; | |
58 | uint32_t backing_file_size; | |
59 | uint32_t mtime; | |
60 | uint64_t size; /* in bytes */ | |
61 | uint8_t cluster_bits; | |
62 | uint8_t l2_bits; | |
ea54feff | 63 | uint16_t padding; |
ea2384d3 FB |
64 | uint32_t crypt_method; |
65 | uint64_t l1_table_offset; | |
ea54feff | 66 | } QEMU_PACKED QCowHeader; |
ea2384d3 FB |
67 | |
68 | #define L2_CACHE_SIZE 16 | |
69 | ||
70 | typedef struct BDRVQcowState { | |
ea2384d3 FB |
71 | int cluster_bits; |
72 | int cluster_size; | |
73 | int cluster_sectors; | |
74 | int l2_bits; | |
75 | int l2_size; | |
46485de0 | 76 | unsigned int l1_size; |
ea2384d3 FB |
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; | |
d85f4222 | 86 | QCryptoBlock *crypto; /* Disk encryption format driver */ |
ea2384d3 | 87 | uint32_t crypt_method_header; |
52b8eb60 | 88 | CoMutex lock; |
fd9f102c | 89 | Error *migration_blocker; |
ea2384d3 FB |
90 | } BDRVQcowState; |
91 | ||
42a3e1ab KW |
92 | static QemuOptsList qcow_create_opts; |
93 | ||
66f82cee | 94 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
ea2384d3 FB |
95 | |
96 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) | |
97 | { | |
98 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 99 | |
712e7874 FB |
100 | if (buf_size >= sizeof(QCowHeader) && |
101 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
5fafdf24 | 102 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
ea2384d3 FB |
103 | return 100; |
104 | else | |
105 | return 0; | |
106 | } | |
107 | ||
d85f4222 DB |
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 | ||
015a1036 HR |
117 | static int qcow_open(BlockDriverState *bs, QDict *options, int flags, |
118 | Error **errp) | |
ea2384d3 FB |
119 | { |
120 | BDRVQcowState *s = bs->opaque; | |
d66e5cee KW |
121 | unsigned int len, i, shift; |
122 | int ret; | |
ea2384d3 | 123 | QCowHeader header; |
fe44dc91 | 124 | Error *local_err = NULL; |
d85f4222 DB |
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"); | |
83f64091 | 132 | |
4e4bf5c4 KW |
133 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
134 | false, errp); | |
135 | if (!bs->file) { | |
d85f4222 DB |
136 | ret = -EINVAL; |
137 | goto fail; | |
4e4bf5c4 KW |
138 | } |
139 | ||
cf2ab8fc | 140 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
84b0ec02 | 141 | if (ret < 0) { |
ea2384d3 | 142 | goto fail; |
84b0ec02 | 143 | } |
ea2384d3 FB |
144 | be32_to_cpus(&header.magic); |
145 | be32_to_cpus(&header.version); | |
146 | be64_to_cpus(&header.backing_file_offset); | |
147 | be32_to_cpus(&header.backing_file_size); | |
148 | be32_to_cpus(&header.mtime); | |
149 | be64_to_cpus(&header.size); | |
150 | be32_to_cpus(&header.crypt_method); | |
151 | be64_to_cpus(&header.l1_table_offset); | |
3b46e624 | 152 | |
84b0ec02 | 153 | if (header.magic != QCOW_MAGIC) { |
76abe407 PB |
154 | error_setg(errp, "Image not in qcow format"); |
155 | ret = -EINVAL; | |
84b0ec02 LZH |
156 | goto fail; |
157 | } | |
158 | if (header.version != QCOW_VERSION) { | |
a55448b3 | 159 | error_setg(errp, "Unsupported qcow version %" PRIu32, header.version); |
84b0ec02 | 160 | ret = -ENOTSUP; |
ea2384d3 | 161 | goto fail; |
84b0ec02 LZH |
162 | } |
163 | ||
7159a45b KW |
164 | if (header.size <= 1) { |
165 | error_setg(errp, "Image size is too small (must be at least 2 bytes)"); | |
84b0ec02 | 166 | ret = -EINVAL; |
ea2384d3 | 167 | goto fail; |
84b0ec02 | 168 | } |
7159a45b KW |
169 | if (header.cluster_bits < 9 || header.cluster_bits > 16) { |
170 | error_setg(errp, "Cluster size must be between 512 and 64k"); | |
171 | ret = -EINVAL; | |
172 | goto fail; | |
173 | } | |
174 | ||
42eb5817 KW |
175 | /* l2_bits specifies number of entries; storing a uint64_t in each entry, |
176 | * so bytes = num_entries << 3. */ | |
177 | if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) { | |
178 | error_setg(errp, "L2 table size must be between 512 and 64k"); | |
179 | ret = -EINVAL; | |
180 | goto fail; | |
181 | } | |
182 | ||
ea2384d3 | 183 | s->crypt_method_header = header.crypt_method; |
84b0ec02 | 184 | if (s->crypt_method_header) { |
e6ff69bf DB |
185 | if (bdrv_uses_whitelist() && |
186 | s->crypt_method_header == QCOW_CRYPT_AES) { | |
8c0dcbc4 DB |
187 | error_setg(errp, |
188 | "Use of AES-CBC encrypted qcow images is no longer " | |
189 | "supported in system emulators"); | |
190 | error_append_hint(errp, | |
191 | "You can use 'qemu-img convert' to convert your " | |
192 | "image to an alternative supported format, such " | |
193 | "as unencrypted qcow, or raw with the LUKS " | |
194 | "format instead.\n"); | |
195 | ret = -ENOSYS; | |
196 | goto fail; | |
e6ff69bf | 197 | } |
d85f4222 DB |
198 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
199 | if (encryptfmt && !g_str_equal(encryptfmt, "aes")) { | |
200 | error_setg(errp, | |
201 | "Header reported 'aes' encryption format but " | |
202 | "options specify '%s'", encryptfmt); | |
203 | ret = -EINVAL; | |
204 | goto fail; | |
205 | } | |
796d3239 MA |
206 | qdict_put_str(encryptopts, "format", "qcow"); |
207 | crypto_opts = block_crypto_open_opts_init(encryptopts, errp); | |
d85f4222 DB |
208 | if (!crypto_opts) { |
209 | ret = -EINVAL; | |
210 | goto fail; | |
211 | } | |
e6ff69bf | 212 | |
d85f4222 DB |
213 | if (flags & BDRV_O_NO_IO) { |
214 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
215 | } | |
1cd9a787 DB |
216 | s->crypto = qcrypto_block_open(crypto_opts, "encrypt.", |
217 | NULL, NULL, cflags, errp); | |
d85f4222 DB |
218 | if (!s->crypto) { |
219 | ret = -EINVAL; | |
220 | goto fail; | |
221 | } | |
222 | } else { | |
223 | error_setg(errp, "invalid encryption method in qcow header"); | |
224 | ret = -EINVAL; | |
225 | goto fail; | |
226 | } | |
54115412 | 227 | bs->encrypted = true; |
c01c214b DB |
228 | } else { |
229 | if (encryptfmt) { | |
230 | error_setg(errp, "No encryption in image header, but options " | |
231 | "specified format '%s'", encryptfmt); | |
232 | ret = -EINVAL; | |
233 | goto fail; | |
234 | } | |
84b0ec02 | 235 | } |
ea2384d3 FB |
236 | s->cluster_bits = header.cluster_bits; |
237 | s->cluster_size = 1 << s->cluster_bits; | |
238 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
239 | s->l2_bits = header.l2_bits; | |
240 | s->l2_size = 1 << s->l2_bits; | |
241 | bs->total_sectors = header.size / 512; | |
242 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; | |
243 | ||
244 | /* read the level 1 table */ | |
245 | shift = s->cluster_bits + s->l2_bits; | |
46485de0 KW |
246 | if (header.size > UINT64_MAX - (1LL << shift)) { |
247 | error_setg(errp, "Image too large"); | |
248 | ret = -EINVAL; | |
249 | goto fail; | |
250 | } else { | |
251 | uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; | |
252 | if (l1_size > INT_MAX / sizeof(uint64_t)) { | |
253 | error_setg(errp, "Image too large"); | |
254 | ret = -EINVAL; | |
255 | goto fail; | |
256 | } | |
257 | s->l1_size = l1_size; | |
258 | } | |
ea2384d3 FB |
259 | |
260 | s->l1_table_offset = header.l1_table_offset; | |
5839e53b | 261 | s->l1_table = g_try_new(uint64_t, s->l1_size); |
0df93305 KW |
262 | if (s->l1_table == NULL) { |
263 | error_setg(errp, "Could not allocate memory for L1 table"); | |
264 | ret = -ENOMEM; | |
265 | goto fail; | |
266 | } | |
84b0ec02 | 267 | |
cf2ab8fc | 268 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
84b0ec02 LZH |
269 | s->l1_size * sizeof(uint64_t)); |
270 | if (ret < 0) { | |
ea2384d3 | 271 | goto fail; |
84b0ec02 LZH |
272 | } |
273 | ||
ea2384d3 FB |
274 | for(i = 0;i < s->l1_size; i++) { |
275 | be64_to_cpus(&s->l1_table[i]); | |
276 | } | |
0df93305 KW |
277 | |
278 | /* alloc L2 cache (max. 64k * 16 * 8 = 8 MB) */ | |
279 | s->l2_cache = | |
9a4f4c31 | 280 | qemu_try_blockalign(bs->file->bs, |
0df93305 KW |
281 | s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
282 | if (s->l2_cache == NULL) { | |
283 | error_setg(errp, "Could not allocate L2 table cache"); | |
284 | ret = -ENOMEM; | |
285 | goto fail; | |
286 | } | |
7267c094 | 287 | s->cluster_cache = g_malloc(s->cluster_size); |
7267c094 | 288 | s->cluster_data = g_malloc(s->cluster_size); |
ea2384d3 | 289 | s->cluster_cache_offset = -1; |
3b46e624 | 290 | |
ea2384d3 FB |
291 | /* read the backing file name */ |
292 | if (header.backing_file_offset != 0) { | |
293 | len = header.backing_file_size; | |
e729fa6a | 294 | if (len > 1023 || len >= sizeof(bs->backing_file)) { |
d66e5cee KW |
295 | error_setg(errp, "Backing file name too long"); |
296 | ret = -EINVAL; | |
297 | goto fail; | |
84b0ec02 | 298 | } |
cf2ab8fc | 299 | ret = bdrv_pread(bs->file, header.backing_file_offset, |
84b0ec02 LZH |
300 | bs->backing_file, len); |
301 | if (ret < 0) { | |
ea2384d3 | 302 | goto fail; |
84b0ec02 | 303 | } |
ea2384d3 FB |
304 | bs->backing_file[len] = '\0'; |
305 | } | |
de33b1f3 | 306 | |
fd9f102c | 307 | /* Disable migration when qcow images are used */ |
81e5f78a AG |
308 | error_setg(&s->migration_blocker, "The qcow format used by node '%s' " |
309 | "does not support live migration", | |
310 | bdrv_get_device_or_node_name(bs)); | |
fe44dc91 AA |
311 | ret = migrate_add_blocker(s->migration_blocker, &local_err); |
312 | if (local_err) { | |
313 | error_propagate(errp, local_err); | |
314 | error_free(s->migration_blocker); | |
315 | goto fail; | |
316 | } | |
fd9f102c | 317 | |
cb3e7f08 | 318 | qobject_unref(encryptopts); |
d85f4222 | 319 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
de33b1f3 | 320 | qemu_co_mutex_init(&s->lock); |
ea2384d3 FB |
321 | return 0; |
322 | ||
323 | fail: | |
7267c094 | 324 | g_free(s->l1_table); |
0df93305 | 325 | qemu_vfree(s->l2_cache); |
7267c094 AL |
326 | g_free(s->cluster_cache); |
327 | g_free(s->cluster_data); | |
d85f4222 | 328 | qcrypto_block_free(s->crypto); |
cb3e7f08 | 329 | qobject_unref(encryptopts); |
d85f4222 | 330 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
84b0ec02 | 331 | return ret; |
ea2384d3 FB |
332 | } |
333 | ||
d177692e JC |
334 | |
335 | /* We have nothing to do for QCOW reopen, stubs just return | |
336 | * success */ | |
337 | static int qcow_reopen_prepare(BDRVReopenState *state, | |
338 | BlockReopenQueue *queue, Error **errp) | |
339 | { | |
340 | return 0; | |
341 | } | |
342 | ||
ea2384d3 FB |
343 | |
344 | /* 'allocate' is: | |
345 | * | |
346 | * 0 to not allocate. | |
347 | * | |
787993a5 EB |
348 | * 1 to allocate a normal cluster (for sector-aligned byte offsets 'n_start' |
349 | * to 'n_end' within the cluster) | |
ea2384d3 FB |
350 | * |
351 | * 2 to allocate a compressed cluster of size | |
352 | * 'compressed_size'. 'compressed_size' must be > 0 and < | |
5fafdf24 | 353 | * cluster_size |
ea2384d3 | 354 | * |
56439e9d EB |
355 | * return 0 if not allocated, 1 if *result is assigned, and negative |
356 | * errno on failure. | |
ea2384d3 | 357 | */ |
56439e9d EB |
358 | static int get_cluster_offset(BlockDriverState *bs, |
359 | uint64_t offset, int allocate, | |
360 | int compressed_size, | |
361 | int n_start, int n_end, uint64_t *result) | |
ea2384d3 FB |
362 | { |
363 | BDRVQcowState *s = bs->opaque; | |
56439e9d | 364 | int min_index, i, j, l1_index, l2_index, ret; |
d7a753a1 EB |
365 | int64_t l2_offset; |
366 | uint64_t *l2_table, cluster_offset, tmp; | |
ea2384d3 FB |
367 | uint32_t min_count; |
368 | int new_l2_table; | |
3b46e624 | 369 | |
56439e9d | 370 | *result = 0; |
ea2384d3 FB |
371 | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
372 | l2_offset = s->l1_table[l1_index]; | |
373 | new_l2_table = 0; | |
374 | if (!l2_offset) { | |
375 | if (!allocate) | |
376 | return 0; | |
377 | /* allocate a new l2 entry */ | |
9a4f4c31 | 378 | l2_offset = bdrv_getlength(bs->file->bs); |
d7a753a1 EB |
379 | if (l2_offset < 0) { |
380 | return l2_offset; | |
381 | } | |
ea2384d3 | 382 | /* round to cluster size */ |
d7a753a1 | 383 | l2_offset = QEMU_ALIGN_UP(l2_offset, s->cluster_size); |
ea2384d3 FB |
384 | /* update the L1 entry */ |
385 | s->l1_table[l1_index] = l2_offset; | |
386 | tmp = cpu_to_be64(l2_offset); | |
0abb1475 | 387 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); |
56439e9d EB |
388 | ret = bdrv_pwrite_sync(bs->file, |
389 | s->l1_table_offset + l1_index * sizeof(tmp), | |
390 | &tmp, sizeof(tmp)); | |
391 | if (ret < 0) { | |
392 | return ret; | |
393 | } | |
ea2384d3 FB |
394 | new_l2_table = 1; |
395 | } | |
396 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
397 | if (l2_offset == s->l2_cache_offsets[i]) { | |
398 | /* increment the hit count */ | |
399 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
400 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
401 | s->l2_cache_counts[j] >>= 1; | |
402 | } | |
403 | } | |
404 | l2_table = s->l2_cache + (i << s->l2_bits); | |
405 | goto found; | |
406 | } | |
407 | } | |
408 | /* not found: load a new entry in the least used one */ | |
409 | min_index = 0; | |
410 | min_count = 0xffffffff; | |
411 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
412 | if (s->l2_cache_counts[i] < min_count) { | |
413 | min_count = s->l2_cache_counts[i]; | |
414 | min_index = i; | |
415 | } | |
416 | } | |
417 | l2_table = s->l2_cache + (min_index << s->l2_bits); | |
0abb1475 | 418 | BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD); |
ea2384d3 FB |
419 | if (new_l2_table) { |
420 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); | |
56439e9d EB |
421 | ret = bdrv_pwrite_sync(bs->file, l2_offset, l2_table, |
422 | s->l2_size * sizeof(uint64_t)); | |
423 | if (ret < 0) { | |
424 | return ret; | |
425 | } | |
ea2384d3 | 426 | } else { |
56439e9d EB |
427 | ret = bdrv_pread(bs->file, l2_offset, l2_table, |
428 | s->l2_size * sizeof(uint64_t)); | |
429 | if (ret < 0) { | |
430 | return ret; | |
431 | } | |
ea2384d3 FB |
432 | } |
433 | s->l2_cache_offsets[min_index] = l2_offset; | |
434 | s->l2_cache_counts[min_index] = 1; | |
435 | found: | |
436 | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1); | |
437 | cluster_offset = be64_to_cpu(l2_table[l2_index]); | |
5fafdf24 | 438 | if (!cluster_offset || |
ea2384d3 FB |
439 | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) { |
440 | if (!allocate) | |
441 | return 0; | |
0abb1475 | 442 | BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC); |
787993a5 | 443 | assert(QEMU_IS_ALIGNED(n_start | n_end, BDRV_SECTOR_SIZE)); |
ea2384d3 FB |
444 | /* allocate a new cluster */ |
445 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) && | |
787993a5 | 446 | (n_end - n_start) < s->cluster_size) { |
ea2384d3 FB |
447 | /* if the cluster is already compressed, we must |
448 | decompress it in the case it is not completely | |
449 | overwritten */ | |
56439e9d EB |
450 | if (decompress_cluster(bs, cluster_offset) < 0) { |
451 | return -EIO; | |
452 | } | |
9a4f4c31 | 453 | cluster_offset = bdrv_getlength(bs->file->bs); |
d7a753a1 EB |
454 | if ((int64_t) cluster_offset < 0) { |
455 | return cluster_offset; | |
456 | } | |
457 | cluster_offset = QEMU_ALIGN_UP(cluster_offset, s->cluster_size); | |
ea2384d3 | 458 | /* write the cluster content */ |
0abb1475 | 459 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
56439e9d EB |
460 | ret = bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, |
461 | s->cluster_size); | |
462 | if (ret < 0) { | |
463 | return ret; | |
464 | } | |
ea2384d3 | 465 | } else { |
9a4f4c31 | 466 | cluster_offset = bdrv_getlength(bs->file->bs); |
d7a753a1 EB |
467 | if ((int64_t) cluster_offset < 0) { |
468 | return cluster_offset; | |
469 | } | |
7f48fa1f AL |
470 | if (allocate == 1) { |
471 | /* round to cluster size */ | |
d7a753a1 EB |
472 | cluster_offset = QEMU_ALIGN_UP(cluster_offset, s->cluster_size); |
473 | if (cluster_offset + s->cluster_size > INT64_MAX) { | |
474 | return -E2BIG; | |
475 | } | |
476 | ret = bdrv_truncate(bs->file, cluster_offset + s->cluster_size, | |
477 | PREALLOC_MODE_OFF, NULL); | |
478 | if (ret < 0) { | |
479 | return ret; | |
480 | } | |
7f48fa1f AL |
481 | /* if encrypted, we must initialize the cluster |
482 | content which won't be written */ | |
8336aafa | 483 | if (bs->encrypted && |
787993a5 EB |
484 | (n_end - n_start) < s->cluster_size) { |
485 | uint64_t start_offset; | |
d85f4222 | 486 | assert(s->crypto); |
787993a5 EB |
487 | start_offset = offset & ~(s->cluster_size - 1); |
488 | for (i = 0; i < s->cluster_size; i += BDRV_SECTOR_SIZE) { | |
7f48fa1f | 489 | if (i < n_start || i >= n_end) { |
787993a5 | 490 | memset(s->cluster_data, 0x00, BDRV_SECTOR_SIZE); |
4609742a | 491 | if (qcrypto_block_encrypt(s->crypto, |
787993a5 | 492 | start_offset + i, |
d85f4222 DB |
493 | s->cluster_data, |
494 | BDRV_SECTOR_SIZE, | |
c3a8fe33 | 495 | NULL) < 0) { |
56439e9d EB |
496 | return -EIO; |
497 | } | |
0abb1475 | 498 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
56439e9d | 499 | ret = bdrv_pwrite(bs->file, |
787993a5 EB |
500 | cluster_offset + i, |
501 | s->cluster_data, | |
502 | BDRV_SECTOR_SIZE); | |
56439e9d EB |
503 | if (ret < 0) { |
504 | return ret; | |
f6fa64f6 | 505 | } |
7f48fa1f | 506 | } |
ea2384d3 FB |
507 | } |
508 | } | |
7f48fa1f AL |
509 | } else if (allocate == 2) { |
510 | cluster_offset |= QCOW_OFLAG_COMPRESSED | | |
511 | (uint64_t)compressed_size << (63 - s->cluster_bits); | |
ea2384d3 FB |
512 | } |
513 | } | |
514 | /* update L2 table */ | |
515 | tmp = cpu_to_be64(cluster_offset); | |
516 | l2_table[l2_index] = tmp; | |
0abb1475 HR |
517 | if (allocate == 2) { |
518 | BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED); | |
519 | } else { | |
520 | BLKDBG_EVENT(bs->file, BLKDBG_L2_UPDATE); | |
521 | } | |
56439e9d EB |
522 | ret = bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
523 | &tmp, sizeof(tmp)); | |
524 | if (ret < 0) { | |
525 | return ret; | |
526 | } | |
ea2384d3 | 527 | } |
56439e9d EB |
528 | *result = cluster_offset; |
529 | return 1; | |
ea2384d3 FB |
530 | } |
531 | ||
d63b4c93 EB |
532 | static int coroutine_fn qcow_co_block_status(BlockDriverState *bs, |
533 | bool want_zero, | |
534 | int64_t offset, int64_t bytes, | |
535 | int64_t *pnum, int64_t *map, | |
536 | BlockDriverState **file) | |
ea2384d3 FB |
537 | { |
538 | BDRVQcowState *s = bs->opaque; | |
d63b4c93 EB |
539 | int index_in_cluster, ret; |
540 | int64_t n; | |
ea2384d3 FB |
541 | uint64_t cluster_offset; |
542 | ||
f8a2e5e3 | 543 | qemu_co_mutex_lock(&s->lock); |
d63b4c93 | 544 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
f8a2e5e3 | 545 | qemu_co_mutex_unlock(&s->lock); |
56439e9d EB |
546 | if (ret < 0) { |
547 | return ret; | |
548 | } | |
d63b4c93 EB |
549 | index_in_cluster = offset & (s->cluster_size - 1); |
550 | n = s->cluster_size - index_in_cluster; | |
551 | if (n > bytes) { | |
552 | n = bytes; | |
553 | } | |
ea2384d3 | 554 | *pnum = n; |
4bc74be9 PB |
555 | if (!cluster_offset) { |
556 | return 0; | |
557 | } | |
d85f4222 | 558 | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypto) { |
4bc74be9 PB |
559 | return BDRV_BLOCK_DATA; |
560 | } | |
d63b4c93 | 561 | *map = cluster_offset | index_in_cluster; |
3064bf6f | 562 | *file = bs->file->bs; |
d63b4c93 | 563 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
ea2384d3 FB |
564 | } |
565 | ||
566 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, | |
567 | const uint8_t *buf, int buf_size) | |
568 | { | |
569 | z_stream strm1, *strm = &strm1; | |
570 | int ret, out_len; | |
571 | ||
572 | memset(strm, 0, sizeof(*strm)); | |
573 | ||
574 | strm->next_in = (uint8_t *)buf; | |
575 | strm->avail_in = buf_size; | |
576 | strm->next_out = out_buf; | |
577 | strm->avail_out = out_buf_size; | |
578 | ||
579 | ret = inflateInit2(strm, -12); | |
580 | if (ret != Z_OK) | |
581 | return -1; | |
582 | ret = inflate(strm, Z_FINISH); | |
583 | out_len = strm->next_out - out_buf; | |
584 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || | |
585 | out_len != out_buf_size) { | |
586 | inflateEnd(strm); | |
587 | return -1; | |
588 | } | |
589 | inflateEnd(strm); | |
590 | return 0; | |
591 | } | |
3b46e624 | 592 | |
66f82cee | 593 | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
ea2384d3 | 594 | { |
66f82cee | 595 | BDRVQcowState *s = bs->opaque; |
ea2384d3 FB |
596 | int ret, csize; |
597 | uint64_t coffset; | |
598 | ||
599 | coffset = cluster_offset & s->cluster_offset_mask; | |
600 | if (s->cluster_cache_offset != coffset) { | |
601 | csize = cluster_offset >> (63 - s->cluster_bits); | |
602 | csize &= (s->cluster_size - 1); | |
0abb1475 | 603 | BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED); |
cf2ab8fc | 604 | ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize); |
5fafdf24 | 605 | if (ret != csize) |
ea2384d3 FB |
606 | return -1; |
607 | if (decompress_buffer(s->cluster_cache, s->cluster_size, | |
608 | s->cluster_data, csize) < 0) { | |
609 | return -1; | |
610 | } | |
611 | s->cluster_cache_offset = coffset; | |
612 | } | |
613 | return 0; | |
614 | } | |
615 | ||
a968168c | 616 | static coroutine_fn int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, |
27deebe8 | 617 | int nb_sectors, QEMUIOVector *qiov) |
83f64091 | 618 | { |
83f64091 | 619 | BDRVQcowState *s = bs->opaque; |
a15312b0 | 620 | int offset_in_cluster; |
27deebe8 | 621 | int ret = 0, n; |
43ca85b5 | 622 | uint64_t cluster_offset; |
430bbaaa FZ |
623 | struct iovec hd_iov; |
624 | QEMUIOVector hd_qiov; | |
27deebe8 FZ |
625 | uint8_t *buf; |
626 | void *orig_buf; | |
a15312b0 EB |
627 | int64_t offset = sector_num * BDRV_SECTOR_SIZE; |
628 | int64_t bytes = nb_sectors * BDRV_SECTOR_SIZE; | |
83f64091 | 629 | |
27deebe8 | 630 | if (qiov->niov > 1) { |
0df93305 KW |
631 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
632 | if (buf == NULL) { | |
633 | return -ENOMEM; | |
634 | } | |
27deebe8 FZ |
635 | } else { |
636 | orig_buf = NULL; | |
637 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 638 | } |
3b46e624 | 639 | |
27deebe8 FZ |
640 | qemu_co_mutex_lock(&s->lock); |
641 | ||
a15312b0 | 642 | while (bytes != 0) { |
27deebe8 | 643 | /* prepare next request */ |
a15312b0 | 644 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
56439e9d EB |
645 | if (ret < 0) { |
646 | break; | |
647 | } | |
a15312b0 EB |
648 | offset_in_cluster = offset & (s->cluster_size - 1); |
649 | n = s->cluster_size - offset_in_cluster; | |
650 | if (n > bytes) { | |
651 | n = bytes; | |
27deebe8 | 652 | } |
ce1a14dc | 653 | |
27deebe8 | 654 | if (!cluster_offset) { |
760e0063 | 655 | if (bs->backing) { |
27deebe8 FZ |
656 | /* read from the base image */ |
657 | hd_iov.iov_base = (void *)buf; | |
a15312b0 | 658 | hd_iov.iov_len = n; |
27deebe8 FZ |
659 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); |
660 | qemu_co_mutex_unlock(&s->lock); | |
0abb1475 HR |
661 | /* qcow2 emits this on bs->file instead of bs->backing */ |
662 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
a15312b0 | 663 | ret = bdrv_co_preadv(bs->backing, offset, n, &hd_qiov, 0); |
27deebe8 FZ |
664 | qemu_co_mutex_lock(&s->lock); |
665 | if (ret < 0) { | |
56439e9d | 666 | break; |
27deebe8 FZ |
667 | } |
668 | } else { | |
669 | /* Note: in this case, no need to wait */ | |
a15312b0 | 670 | memset(buf, 0, n); |
27deebe8 FZ |
671 | } |
672 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { | |
673 | /* add AIO support for compressed blocks ? */ | |
674 | if (decompress_cluster(bs, cluster_offset) < 0) { | |
56439e9d EB |
675 | ret = -EIO; |
676 | break; | |
27deebe8 | 677 | } |
a15312b0 | 678 | memcpy(buf, s->cluster_cache + offset_in_cluster, n); |
27deebe8 FZ |
679 | } else { |
680 | if ((cluster_offset & 511) != 0) { | |
56439e9d EB |
681 | ret = -EIO; |
682 | break; | |
27deebe8 FZ |
683 | } |
684 | hd_iov.iov_base = (void *)buf; | |
a15312b0 | 685 | hd_iov.iov_len = n; |
430bbaaa | 686 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); |
52b8eb60 | 687 | qemu_co_mutex_unlock(&s->lock); |
0abb1475 | 688 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
a15312b0 EB |
689 | ret = bdrv_co_preadv(bs->file, cluster_offset + offset_in_cluster, |
690 | n, &hd_qiov, 0); | |
52b8eb60 KW |
691 | qemu_co_mutex_lock(&s->lock); |
692 | if (ret < 0) { | |
27deebe8 FZ |
693 | break; |
694 | } | |
8336aafa | 695 | if (bs->encrypted) { |
d85f4222 | 696 | assert(s->crypto); |
4609742a | 697 | if (qcrypto_block_decrypt(s->crypto, |
a15312b0 | 698 | offset, buf, n, NULL) < 0) { |
56439e9d EB |
699 | ret = -EIO; |
700 | break; | |
f6fa64f6 | 701 | } |
5614c188 | 702 | } |
5614c188 | 703 | } |
27deebe8 | 704 | ret = 0; |
f141eafe | 705 | |
a15312b0 EB |
706 | bytes -= n; |
707 | offset += n; | |
708 | buf += n; | |
43ca85b5 FZ |
709 | } |
710 | ||
52b8eb60 KW |
711 | qemu_co_mutex_unlock(&s->lock); |
712 | ||
27deebe8 | 713 | if (qiov->niov > 1) { |
03396148 | 714 | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); |
27deebe8 | 715 | qemu_vfree(orig_buf); |
b11a24de KW |
716 | } |
717 | ||
52b8eb60 | 718 | return ret; |
83f64091 FB |
719 | } |
720 | ||
a968168c | 721 | static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, |
e18a58b4 EB |
722 | int nb_sectors, QEMUIOVector *qiov, |
723 | int flags) | |
83f64091 | 724 | { |
83f64091 | 725 | BDRVQcowState *s = bs->opaque; |
d1326a78 | 726 | int offset_in_cluster; |
83f64091 | 727 | uint64_t cluster_offset; |
27deebe8 | 728 | int ret = 0, n; |
430bbaaa FZ |
729 | struct iovec hd_iov; |
730 | QEMUIOVector hd_qiov; | |
27deebe8 FZ |
731 | uint8_t *buf; |
732 | void *orig_buf; | |
d1326a78 EB |
733 | int64_t offset = sector_num * BDRV_SECTOR_SIZE; |
734 | int64_t bytes = nb_sectors * BDRV_SECTOR_SIZE; | |
ce1a14dc | 735 | |
e18a58b4 | 736 | assert(!flags); |
27deebe8 | 737 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
3b46e624 | 738 | |
1fad1f94 DB |
739 | /* We must always copy the iov when encrypting, so we |
740 | * don't modify the original data buffer during encryption */ | |
741 | if (bs->encrypted || qiov->niov > 1) { | |
0df93305 KW |
742 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
743 | if (buf == NULL) { | |
744 | return -ENOMEM; | |
745 | } | |
d5e6b161 | 746 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
83f64091 | 747 | } else { |
27deebe8 FZ |
748 | orig_buf = NULL; |
749 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 750 | } |
c87c0672 | 751 | |
52b8eb60 | 752 | qemu_co_mutex_lock(&s->lock); |
43ca85b5 | 753 | |
d1326a78 EB |
754 | while (bytes != 0) { |
755 | offset_in_cluster = offset & (s->cluster_size - 1); | |
756 | n = s->cluster_size - offset_in_cluster; | |
757 | if (n > bytes) { | |
758 | n = bytes; | |
27deebe8 | 759 | } |
d1326a78 EB |
760 | ret = get_cluster_offset(bs, offset, 1, 0, offset_in_cluster, |
761 | offset_in_cluster + n, &cluster_offset); | |
56439e9d EB |
762 | if (ret < 0) { |
763 | break; | |
764 | } | |
27deebe8 FZ |
765 | if (!cluster_offset || (cluster_offset & 511) != 0) { |
766 | ret = -EIO; | |
767 | break; | |
768 | } | |
8336aafa | 769 | if (bs->encrypted) { |
d85f4222 | 770 | assert(s->crypto); |
d1326a78 | 771 | if (qcrypto_block_encrypt(s->crypto, offset, buf, n, NULL) < 0) { |
f6fa64f6 DB |
772 | ret = -EIO; |
773 | break; | |
774 | } | |
27deebe8 | 775 | } |
83f64091 | 776 | |
1fad1f94 | 777 | hd_iov.iov_base = (void *)buf; |
d1326a78 | 778 | hd_iov.iov_len = n; |
27deebe8 FZ |
779 | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); |
780 | qemu_co_mutex_unlock(&s->lock); | |
0abb1475 | 781 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
d1326a78 EB |
782 | ret = bdrv_co_pwritev(bs->file, cluster_offset + offset_in_cluster, |
783 | n, &hd_qiov, 0); | |
27deebe8 FZ |
784 | qemu_co_mutex_lock(&s->lock); |
785 | if (ret < 0) { | |
786 | break; | |
787 | } | |
788 | ret = 0; | |
ad53089b | 789 | |
d1326a78 EB |
790 | bytes -= n; |
791 | offset += n; | |
792 | buf += n; | |
27deebe8 | 793 | } |
52b8eb60 | 794 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 795 | |
1fad1f94 | 796 | qemu_vfree(orig_buf); |
b11a24de | 797 | |
52b8eb60 | 798 | return ret; |
83f64091 FB |
799 | } |
800 | ||
e2731add | 801 | static void qcow_close(BlockDriverState *bs) |
ea2384d3 FB |
802 | { |
803 | BDRVQcowState *s = bs->opaque; | |
fd9f102c | 804 | |
d85f4222 DB |
805 | qcrypto_block_free(s->crypto); |
806 | s->crypto = NULL; | |
7267c094 | 807 | g_free(s->l1_table); |
0df93305 | 808 | qemu_vfree(s->l2_cache); |
7267c094 AL |
809 | g_free(s->cluster_cache); |
810 | g_free(s->cluster_data); | |
fd9f102c KW |
811 | |
812 | migrate_del_blocker(s->migration_blocker); | |
813 | error_free(s->migration_blocker); | |
ea2384d3 FB |
814 | } |
815 | ||
42a3e1ab KW |
816 | static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts, |
817 | Error **errp) | |
ea2384d3 | 818 | { |
42a3e1ab | 819 | BlockdevCreateOptionsQcow *qcow_opts; |
2b16c9ff | 820 | int header_size, backing_filename_len, l1_size, shift, i; |
ea2384d3 | 821 | QCowHeader header; |
2b16c9ff | 822 | uint8_t *tmp; |
0e7e1989 | 823 | int64_t total_size = 0; |
3e1a8134 | 824 | int ret; |
42a3e1ab | 825 | BlockDriverState *bs; |
6af40160 | 826 | BlockBackend *qcow_blk; |
d85f4222 | 827 | QCryptoBlock *crypto = NULL; |
0e7e1989 | 828 | |
42a3e1ab KW |
829 | assert(opts->driver == BLOCKDEV_DRIVER_QCOW); |
830 | qcow_opts = &opts->u.qcow; | |
831 | ||
832 | /* Sanity checks */ | |
833 | total_size = qcow_opts->size; | |
6aa837f7 DB |
834 | if (total_size == 0) { |
835 | error_setg(errp, "Image size is too small, cannot be zero length"); | |
42a3e1ab | 836 | return -EINVAL; |
6aa837f7 DB |
837 | } |
838 | ||
42a3e1ab KW |
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; | |
0e7e1989 | 844 | } |
ea2384d3 | 845 | |
42a3e1ab KW |
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; | |
2b16c9ff LZH |
850 | } |
851 | ||
42a3e1ab KW |
852 | qcow_blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); |
853 | ret = blk_insert_bs(qcow_blk, bs, errp); | |
854 | if (ret < 0) { | |
855 | goto exit; | |
2b16c9ff | 856 | } |
6af40160 KW |
857 | blk_set_allow_write_beyond_eof(qcow_blk, true); |
858 | ||
42a3e1ab | 859 | /* Create image format */ |
3a691c50 | 860 | ret = blk_truncate(qcow_blk, 0, PREALLOC_MODE_OFF, errp); |
2b16c9ff LZH |
861 | if (ret < 0) { |
862 | goto exit; | |
863 | } | |
864 | ||
ea2384d3 FB |
865 | memset(&header, 0, sizeof(header)); |
866 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
867 | header.version = cpu_to_be32(QCOW_VERSION); | |
180e9526 | 868 | header.size = cpu_to_be64(total_size); |
ea2384d3 FB |
869 | header_size = sizeof(header); |
870 | backing_filename_len = 0; | |
42a3e1ab KW |
871 | if (qcow_opts->has_backing_file) { |
872 | if (strcmp(qcow_opts->backing_file, "fat:")) { | |
7852e5da | 873 | header.backing_file_offset = cpu_to_be64(header_size); |
42a3e1ab | 874 | backing_filename_len = strlen(qcow_opts->backing_file); |
7852e5da AJ |
875 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
876 | header_size += backing_filename_len; | |
877 | } else { | |
878 | /* special backing file for vvfat */ | |
42a3e1ab | 879 | qcow_opts->has_backing_file = false; |
7852e5da | 880 | } |
ea2384d3 | 881 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
dc6fb73d | 882 | unmodified sectors */ |
ea2384d3 FB |
883 | header.l2_bits = 12; /* 32 KB L2 tables */ |
884 | } else { | |
885 | header.cluster_bits = 12; /* 4 KB clusters */ | |
886 | header.l2_bits = 9; /* 4 KB L2 tables */ | |
887 | } | |
888 | header_size = (header_size + 7) & ~7; | |
889 | shift = header.cluster_bits + header.l2_bits; | |
180e9526 | 890 | l1_size = (total_size + (1LL << shift) - 1) >> shift; |
ea2384d3 FB |
891 | |
892 | header.l1_table_offset = cpu_to_be64(header_size); | |
d85f4222 | 893 | |
42a3e1ab | 894 | if (qcow_opts->has_encrypt) { |
ea2384d3 | 895 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
d85f4222 | 896 | |
42a3e1ab | 897 | crypto = qcrypto_block_create(qcow_opts->encrypt, "encrypt.", |
1cd9a787 | 898 | NULL, NULL, NULL, errp); |
d85f4222 DB |
899 | if (!crypto) { |
900 | ret = -EINVAL; | |
901 | goto exit; | |
902 | } | |
ea2384d3 FB |
903 | } else { |
904 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
905 | } | |
3b46e624 | 906 | |
ea2384d3 | 907 | /* write all the data */ |
8341f00d | 908 | ret = blk_pwrite(qcow_blk, 0, &header, sizeof(header), 0); |
3e1a8134 | 909 | if (ret != sizeof(header)) { |
3e1a8134 KS |
910 | goto exit; |
911 | } | |
912 | ||
42a3e1ab | 913 | if (qcow_opts->has_backing_file) { |
6af40160 | 914 | ret = blk_pwrite(qcow_blk, sizeof(header), |
42a3e1ab | 915 | qcow_opts->backing_file, backing_filename_len, 0); |
3e1a8134 | 916 | if (ret != backing_filename_len) { |
3e1a8134 KS |
917 | goto exit; |
918 | } | |
ea2384d3 | 919 | } |
2b16c9ff LZH |
920 | |
921 | tmp = g_malloc0(BDRV_SECTOR_SIZE); | |
d737b78c LV |
922 | for (i = 0; i < DIV_ROUND_UP(sizeof(uint64_t) * l1_size, BDRV_SECTOR_SIZE); |
923 | i++) { | |
8341f00d EB |
924 | ret = blk_pwrite(qcow_blk, header_size + BDRV_SECTOR_SIZE * i, |
925 | tmp, BDRV_SECTOR_SIZE, 0); | |
2b16c9ff LZH |
926 | if (ret != BDRV_SECTOR_SIZE) { |
927 | g_free(tmp); | |
3e1a8134 KS |
928 | goto exit; |
929 | } | |
ea2384d3 | 930 | } |
3e1a8134 | 931 | |
2b16c9ff | 932 | g_free(tmp); |
3e1a8134 KS |
933 | ret = 0; |
934 | exit: | |
6af40160 | 935 | blk_unref(qcow_blk); |
d85f4222 | 936 | qcrypto_block_free(crypto); |
42a3e1ab KW |
937 | return ret; |
938 | } | |
939 | ||
940 | static int coroutine_fn qcow_co_create_opts(const char *filename, | |
941 | QemuOpts *opts, Error **errp) | |
942 | { | |
943 | BlockdevCreateOptions *create_options = NULL; | |
944 | BlockDriverState *bs = NULL; | |
92adf9db | 945 | QDict *qdict; |
42a3e1ab KW |
946 | Visitor *v; |
947 | const char *val; | |
948 | Error *local_err = NULL; | |
949 | int ret; | |
950 | ||
951 | static const QDictRenames opt_renames[] = { | |
952 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, | |
953 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, | |
954 | { NULL, NULL }, | |
955 | }; | |
956 | ||
957 | /* Parse options and convert legacy syntax */ | |
958 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &qcow_create_opts, true); | |
959 | ||
960 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); | |
961 | if (val && !strcmp(val, "on")) { | |
962 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow"); | |
963 | } else if (val && !strcmp(val, "off")) { | |
964 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); | |
965 | } | |
966 | ||
967 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); | |
968 | if (val && !strcmp(val, "aes")) { | |
969 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow"); | |
970 | } | |
971 | ||
972 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
973 | ret = -EINVAL; | |
974 | goto fail; | |
975 | } | |
976 | ||
977 | /* Create and open the file (protocol layer) */ | |
978 | ret = bdrv_create_file(filename, opts, &local_err); | |
979 | if (ret < 0) { | |
980 | error_propagate(errp, local_err); | |
981 | goto fail; | |
982 | } | |
983 | ||
984 | bs = bdrv_open(filename, NULL, NULL, | |
985 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
986 | if (bs == NULL) { | |
987 | ret = -EIO; | |
988 | goto fail; | |
989 | } | |
990 | ||
991 | /* Now get the QAPI type BlockdevCreateOptions */ | |
992 | qdict_put_str(qdict, "driver", "qcow"); | |
993 | qdict_put_str(qdict, "file", bs->node_name); | |
994 | ||
af91062e MA |
995 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
996 | if (!v) { | |
42a3e1ab KW |
997 | ret = -EINVAL; |
998 | goto fail; | |
999 | } | |
1000 | ||
42a3e1ab KW |
1001 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); |
1002 | visit_free(v); | |
1003 | ||
1004 | if (local_err) { | |
1005 | error_propagate(errp, local_err); | |
1006 | ret = -EINVAL; | |
1007 | goto fail; | |
1008 | } | |
1009 | ||
1010 | /* Silently round up size */ | |
1011 | assert(create_options->driver == BLOCKDEV_DRIVER_QCOW); | |
1012 | create_options->u.qcow.size = | |
1013 | ROUND_UP(create_options->u.qcow.size, BDRV_SECTOR_SIZE); | |
1014 | ||
1015 | /* Create the qcow image (format layer) */ | |
1016 | ret = qcow_co_create(create_options, errp); | |
1017 | if (ret < 0) { | |
1018 | goto fail; | |
1019 | } | |
1020 | ||
1021 | ret = 0; | |
1022 | fail: | |
cb3e7f08 | 1023 | qobject_unref(qdict); |
42a3e1ab KW |
1024 | bdrv_unref(bs); |
1025 | qapi_free_BlockdevCreateOptions(create_options); | |
3e1a8134 | 1026 | return ret; |
ea2384d3 FB |
1027 | } |
1028 | ||
c47c33b0 | 1029 | static int qcow_make_empty(BlockDriverState *bs) |
95389c86 FB |
1030 | { |
1031 | BDRVQcowState *s = bs->opaque; | |
1032 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
83f64091 | 1033 | int ret; |
95389c86 FB |
1034 | |
1035 | memset(s->l1_table, 0, l1_length); | |
d9ca2ea2 | 1036 | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table, |
5e5557d9 KW |
1037 | l1_length) < 0) |
1038 | return -1; | |
7ea37c30 HR |
1039 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length, |
1040 | PREALLOC_MODE_OFF, NULL); | |
83f64091 FB |
1041 | if (ret < 0) |
1042 | return ret; | |
95389c86 FB |
1043 | |
1044 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); | |
1045 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); | |
1046 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
ea2384d3 FB |
1051 | /* XXX: put compressed sectors first, then all the cluster aligned |
1052 | tables to avoid losing bytes in alignment */ | |
f2b95a12 PB |
1053 | static coroutine_fn int |
1054 | qcow_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, | |
1055 | uint64_t bytes, QEMUIOVector *qiov) | |
ea2384d3 FB |
1056 | { |
1057 | BDRVQcowState *s = bs->opaque; | |
f2b95a12 PB |
1058 | QEMUIOVector hd_qiov; |
1059 | struct iovec iov; | |
ea2384d3 FB |
1060 | z_stream strm; |
1061 | int ret, out_len; | |
f2b95a12 | 1062 | uint8_t *buf, *out_buf; |
ea2384d3 FB |
1063 | uint64_t cluster_offset; |
1064 | ||
655923df | 1065 | buf = qemu_blockalign(bs, s->cluster_size); |
f2b95a12 | 1066 | if (bytes != s->cluster_size) { |
655923df PB |
1067 | if (bytes > s->cluster_size || |
1068 | offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) | |
f2b95a12 | 1069 | { |
655923df PB |
1070 | qemu_vfree(buf); |
1071 | return -EINVAL; | |
16b3c5cd | 1072 | } |
655923df PB |
1073 | /* Zero-pad last write if image size is not cluster aligned */ |
1074 | memset(buf + bytes, 0, s->cluster_size - bytes); | |
16b3c5cd | 1075 | } |
f2b95a12 | 1076 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
ea2384d3 | 1077 | |
ebf7bba0 | 1078 | out_buf = g_malloc(s->cluster_size); |
ea2384d3 FB |
1079 | |
1080 | /* best compression, small window, no zlib header */ | |
1081 | memset(&strm, 0, sizeof(strm)); | |
1082 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
5fafdf24 | 1083 | Z_DEFLATED, -12, |
ea2384d3 FB |
1084 | 9, Z_DEFAULT_STRATEGY); |
1085 | if (ret != 0) { | |
64ebe71a KW |
1086 | ret = -EINVAL; |
1087 | goto fail; | |
ea2384d3 FB |
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) { | |
ea2384d3 | 1097 | deflateEnd(&strm); |
64ebe71a KW |
1098 | ret = -EINVAL; |
1099 | goto fail; | |
ea2384d3 FB |
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 */ | |
f2b95a12 | 1107 | ret = qcow_co_writev(bs, offset >> BDRV_SECTOR_BITS, |
e18a58b4 | 1108 | bytes >> BDRV_SECTOR_BITS, qiov, 0); |
64ebe71a KW |
1109 | if (ret < 0) { |
1110 | goto fail; | |
ea2384d3 | 1111 | } |
f2b95a12 PB |
1112 | goto success; |
1113 | } | |
1114 | qemu_co_mutex_lock(&s->lock); | |
56439e9d | 1115 | ret = get_cluster_offset(bs, offset, 2, out_len, 0, 0, &cluster_offset); |
f2b95a12 | 1116 | qemu_co_mutex_unlock(&s->lock); |
56439e9d EB |
1117 | if (ret < 0) { |
1118 | goto fail; | |
1119 | } | |
f2b95a12 PB |
1120 | if (cluster_offset == 0) { |
1121 | ret = -EIO; | |
1122 | goto fail; | |
ea2384d3 | 1123 | } |
f2b95a12 | 1124 | cluster_offset &= s->cluster_offset_mask; |
3b46e624 | 1125 | |
f2b95a12 PB |
1126 | iov = (struct iovec) { |
1127 | .iov_base = out_buf, | |
1128 | .iov_len = out_len, | |
1129 | }; | |
1130 | qemu_iovec_init_external(&hd_qiov, &iov, 1); | |
0abb1475 | 1131 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
f2b95a12 PB |
1132 | ret = bdrv_co_pwritev(bs->file, cluster_offset, out_len, &hd_qiov, 0); |
1133 | if (ret < 0) { | |
1134 | goto fail; | |
1135 | } | |
1136 | success: | |
64ebe71a KW |
1137 | ret = 0; |
1138 | fail: | |
f2b95a12 | 1139 | qemu_vfree(buf); |
7267c094 | 1140 | g_free(out_buf); |
64ebe71a | 1141 | return ret; |
ea2384d3 FB |
1142 | } |
1143 | ||
c47c33b0 FB |
1144 | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1145 | { | |
1146 | BDRVQcowState *s = bs->opaque; | |
1147 | bdi->cluster_size = s->cluster_size; | |
1148 | return 0; | |
1149 | } | |
1150 | ||
16d12159 CL |
1151 | static QemuOptsList qcow_create_opts = { |
1152 | .name = "qcow-create-opts", | |
1153 | .head = QTAILQ_HEAD_INITIALIZER(qcow_create_opts.head), | |
1154 | .desc = { | |
1155 | { | |
1156 | .name = BLOCK_OPT_SIZE, | |
1157 | .type = QEMU_OPT_SIZE, | |
1158 | .help = "Virtual disk size" | |
1159 | }, | |
1160 | { | |
1161 | .name = BLOCK_OPT_BACKING_FILE, | |
1162 | .type = QEMU_OPT_STRING, | |
1163 | .help = "File name of a base image" | |
1164 | }, | |
1165 | { | |
1166 | .name = BLOCK_OPT_ENCRYPT, | |
1167 | .type = QEMU_OPT_BOOL, | |
0cb8d47b DB |
1168 | .help = "Encrypt the image with format 'aes'. (Deprecated " |
1169 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)", | |
1170 | }, | |
1171 | { | |
1172 | .name = BLOCK_OPT_ENCRYPT_FORMAT, | |
1173 | .type = QEMU_OPT_STRING, | |
1174 | .help = "Encrypt the image, format choices: 'aes'", | |
16d12159 | 1175 | }, |
d85f4222 | 1176 | BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."), |
16d12159 CL |
1177 | { /* end of list */ } |
1178 | } | |
0e7e1989 KW |
1179 | }; |
1180 | ||
5efa9d5a | 1181 | static BlockDriver bdrv_qcow = { |
e60f469c AJ |
1182 | .format_name = "qcow", |
1183 | .instance_size = sizeof(BDRVQcowState), | |
1184 | .bdrv_probe = qcow_probe, | |
1185 | .bdrv_open = qcow_open, | |
1186 | .bdrv_close = qcow_close, | |
862f215f | 1187 | .bdrv_child_perm = bdrv_format_default_perms, |
16d12159 | 1188 | .bdrv_reopen_prepare = qcow_reopen_prepare, |
42a3e1ab | 1189 | .bdrv_co_create = qcow_co_create, |
efc75e2a | 1190 | .bdrv_co_create_opts = qcow_co_create_opts, |
3ac21627 | 1191 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
8ee79e70 | 1192 | .supports_backing = true, |
c68b89ac KW |
1193 | |
1194 | .bdrv_co_readv = qcow_co_readv, | |
1195 | .bdrv_co_writev = qcow_co_writev, | |
d63b4c93 | 1196 | .bdrv_co_block_status = qcow_co_block_status, |
c68b89ac | 1197 | |
c68b89ac | 1198 | .bdrv_make_empty = qcow_make_empty, |
f2b95a12 | 1199 | .bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed, |
c68b89ac | 1200 | .bdrv_get_info = qcow_get_info, |
0e7e1989 | 1201 | |
16d12159 | 1202 | .create_opts = &qcow_create_opts, |
ea2384d3 | 1203 | }; |
5efa9d5a AL |
1204 | |
1205 | static void bdrv_qcow_init(void) | |
1206 | { | |
1207 | bdrv_register(&bdrv_qcow); | |
1208 | } | |
1209 | ||
1210 | block_init(bdrv_qcow_init); |