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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" |
998c2019 | 34 | #include "qemu/cutils.h" |
5df022cf | 35 | #include "qemu/memalign.h" |
28d34b82 | 36 | #include <zlib.h> |
452fcdbc | 37 | #include "qapi/qmp/qdict.h" |
d85f4222 | 38 | #include "qapi/qmp/qstring.h" |
42a3e1ab KW |
39 | #include "qapi/qobject-input-visitor.h" |
40 | #include "qapi/qapi-visit-block-core.h" | |
d85f4222 | 41 | #include "crypto/block.h" |
795c40b8 | 42 | #include "migration/blocker.h" |
0d8c41da | 43 | #include "crypto.h" |
ea2384d3 FB |
44 | |
45 | /**************************************************************/ | |
46 | /* QEMU COW block driver with compression and encryption support */ | |
47 | ||
48 | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) | |
49 | #define QCOW_VERSION 1 | |
50 | ||
51 | #define QCOW_CRYPT_NONE 0 | |
52 | #define QCOW_CRYPT_AES 1 | |
53 | ||
54 | #define QCOW_OFLAG_COMPRESSED (1LL << 63) | |
55 | ||
56 | typedef struct QCowHeader { | |
57 | uint32_t magic; | |
58 | uint32_t version; | |
59 | uint64_t backing_file_offset; | |
60 | uint32_t backing_file_size; | |
61 | uint32_t mtime; | |
62 | uint64_t size; /* in bytes */ | |
63 | uint8_t cluster_bits; | |
64 | uint8_t l2_bits; | |
ea54feff | 65 | uint16_t padding; |
ea2384d3 FB |
66 | uint32_t crypt_method; |
67 | uint64_t l1_table_offset; | |
ea54feff | 68 | } QEMU_PACKED QCowHeader; |
ea2384d3 FB |
69 | |
70 | #define L2_CACHE_SIZE 16 | |
71 | ||
72 | typedef struct BDRVQcowState { | |
ea2384d3 FB |
73 | int cluster_bits; |
74 | int cluster_size; | |
ea2384d3 FB |
75 | int l2_bits; |
76 | int l2_size; | |
46485de0 | 77 | unsigned int l1_size; |
ea2384d3 FB |
78 | uint64_t cluster_offset_mask; |
79 | uint64_t l1_table_offset; | |
80 | uint64_t *l1_table; | |
81 | uint64_t *l2_cache; | |
82 | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; | |
83 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
84 | uint8_t *cluster_cache; | |
85 | uint8_t *cluster_data; | |
86 | uint64_t cluster_cache_offset; | |
d85f4222 | 87 | QCryptoBlock *crypto; /* Disk encryption format driver */ |
ea2384d3 | 88 | uint32_t crypt_method_header; |
52b8eb60 | 89 | CoMutex lock; |
fd9f102c | 90 | Error *migration_blocker; |
ea2384d3 FB |
91 | } BDRVQcowState; |
92 | ||
42a3e1ab KW |
93 | static QemuOptsList qcow_create_opts; |
94 | ||
b9b10c35 KW |
95 | static int coroutine_fn GRAPH_RDLOCK |
96 | decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); | |
ea2384d3 FB |
97 | |
98 | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) | |
99 | { | |
100 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 101 | |
712e7874 FB |
102 | if (buf_size >= sizeof(QCowHeader) && |
103 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
5fafdf24 | 104 | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
ea2384d3 FB |
105 | return 100; |
106 | else | |
107 | return 0; | |
108 | } | |
109 | ||
015a1036 HR |
110 | static int qcow_open(BlockDriverState *bs, QDict *options, int flags, |
111 | Error **errp) | |
ea2384d3 FB |
112 | { |
113 | BDRVQcowState *s = bs->opaque; | |
d66e5cee KW |
114 | unsigned int len, i, shift; |
115 | int ret; | |
ea2384d3 | 116 | QCowHeader header; |
d85f4222 DB |
117 | QCryptoBlockOpenOptions *crypto_opts = NULL; |
118 | unsigned int cflags = 0; | |
119 | QDict *encryptopts = NULL; | |
120 | const char *encryptfmt; | |
121 | ||
122 | qdict_extract_subqdict(options, &encryptopts, "encrypt."); | |
123 | encryptfmt = qdict_get_try_str(encryptopts, "format"); | |
83f64091 | 124 | |
83930780 VSO |
125 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
126 | if (ret < 0) { | |
a4b740db | 127 | goto fail_unlocked; |
4e4bf5c4 KW |
128 | } |
129 | ||
a4b740db KW |
130 | bdrv_graph_rdlock_main_loop(); |
131 | ||
32cc71de | 132 | ret = bdrv_pread(bs->file, 0, sizeof(header), &header, 0); |
84b0ec02 | 133 | if (ret < 0) { |
ea2384d3 | 134 | goto fail; |
84b0ec02 | 135 | } |
a5fdff18 PM |
136 | header.magic = be32_to_cpu(header.magic); |
137 | header.version = be32_to_cpu(header.version); | |
138 | header.backing_file_offset = be64_to_cpu(header.backing_file_offset); | |
139 | header.backing_file_size = be32_to_cpu(header.backing_file_size); | |
140 | header.mtime = be32_to_cpu(header.mtime); | |
141 | header.size = be64_to_cpu(header.size); | |
142 | header.crypt_method = be32_to_cpu(header.crypt_method); | |
143 | header.l1_table_offset = be64_to_cpu(header.l1_table_offset); | |
3b46e624 | 144 | |
84b0ec02 | 145 | if (header.magic != QCOW_MAGIC) { |
76abe407 PB |
146 | error_setg(errp, "Image not in qcow format"); |
147 | ret = -EINVAL; | |
84b0ec02 LZH |
148 | goto fail; |
149 | } | |
150 | if (header.version != QCOW_VERSION) { | |
197bfa7d JS |
151 | error_setg(errp, "qcow (v%d) does not support qcow version %" PRIu32, |
152 | QCOW_VERSION, header.version); | |
153 | if (header.version == 2 || header.version == 3) { | |
154 | error_append_hint(errp, "Try the 'qcow2' driver instead.\n"); | |
155 | } | |
156 | ||
84b0ec02 | 157 | ret = -ENOTSUP; |
ea2384d3 | 158 | goto fail; |
84b0ec02 LZH |
159 | } |
160 | ||
7159a45b KW |
161 | if (header.size <= 1) { |
162 | error_setg(errp, "Image size is too small (must be at least 2 bytes)"); | |
84b0ec02 | 163 | ret = -EINVAL; |
ea2384d3 | 164 | goto fail; |
84b0ec02 | 165 | } |
7159a45b KW |
166 | if (header.cluster_bits < 9 || header.cluster_bits > 16) { |
167 | error_setg(errp, "Cluster size must be between 512 and 64k"); | |
168 | ret = -EINVAL; | |
169 | goto fail; | |
170 | } | |
171 | ||
42eb5817 KW |
172 | /* l2_bits specifies number of entries; storing a uint64_t in each entry, |
173 | * so bytes = num_entries << 3. */ | |
174 | if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) { | |
175 | error_setg(errp, "L2 table size must be between 512 and 64k"); | |
176 | ret = -EINVAL; | |
177 | goto fail; | |
178 | } | |
179 | ||
ea2384d3 | 180 | s->crypt_method_header = header.crypt_method; |
84b0ec02 | 181 | if (s->crypt_method_header) { |
e6ff69bf DB |
182 | if (bdrv_uses_whitelist() && |
183 | s->crypt_method_header == QCOW_CRYPT_AES) { | |
8c0dcbc4 DB |
184 | error_setg(errp, |
185 | "Use of AES-CBC encrypted qcow images is no longer " | |
186 | "supported in system emulators"); | |
187 | error_append_hint(errp, | |
188 | "You can use 'qemu-img convert' to convert your " | |
189 | "image to an alternative supported format, such " | |
190 | "as unencrypted qcow, or raw with the LUKS " | |
191 | "format instead.\n"); | |
192 | ret = -ENOSYS; | |
193 | goto fail; | |
e6ff69bf | 194 | } |
d85f4222 DB |
195 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
196 | if (encryptfmt && !g_str_equal(encryptfmt, "aes")) { | |
197 | error_setg(errp, | |
198 | "Header reported 'aes' encryption format but " | |
199 | "options specify '%s'", encryptfmt); | |
200 | ret = -EINVAL; | |
201 | goto fail; | |
202 | } | |
796d3239 MA |
203 | qdict_put_str(encryptopts, "format", "qcow"); |
204 | crypto_opts = block_crypto_open_opts_init(encryptopts, errp); | |
d85f4222 DB |
205 | if (!crypto_opts) { |
206 | ret = -EINVAL; | |
207 | goto fail; | |
208 | } | |
e6ff69bf | 209 | |
d85f4222 DB |
210 | if (flags & BDRV_O_NO_IO) { |
211 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
212 | } | |
1cd9a787 | 213 | s->crypto = qcrypto_block_open(crypto_opts, "encrypt.", |
c972fa12 | 214 | NULL, NULL, cflags, 1, errp); |
d85f4222 DB |
215 | if (!s->crypto) { |
216 | ret = -EINVAL; | |
217 | goto fail; | |
218 | } | |
219 | } else { | |
220 | error_setg(errp, "invalid encryption method in qcow header"); | |
221 | ret = -EINVAL; | |
222 | goto fail; | |
223 | } | |
54115412 | 224 | bs->encrypted = true; |
c01c214b DB |
225 | } else { |
226 | if (encryptfmt) { | |
227 | error_setg(errp, "No encryption in image header, but options " | |
228 | "specified format '%s'", encryptfmt); | |
229 | ret = -EINVAL; | |
230 | goto fail; | |
231 | } | |
84b0ec02 | 232 | } |
ea2384d3 FB |
233 | s->cluster_bits = header.cluster_bits; |
234 | s->cluster_size = 1 << s->cluster_bits; | |
ea2384d3 FB |
235 | s->l2_bits = header.l2_bits; |
236 | s->l2_size = 1 << s->l2_bits; | |
237 | bs->total_sectors = header.size / 512; | |
238 | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; | |
239 | ||
240 | /* read the level 1 table */ | |
241 | shift = s->cluster_bits + s->l2_bits; | |
46485de0 KW |
242 | if (header.size > UINT64_MAX - (1LL << shift)) { |
243 | error_setg(errp, "Image too large"); | |
244 | ret = -EINVAL; | |
245 | goto fail; | |
246 | } else { | |
247 | uint64_t l1_size = (header.size + (1LL << shift) - 1) >> shift; | |
248 | if (l1_size > INT_MAX / sizeof(uint64_t)) { | |
249 | error_setg(errp, "Image too large"); | |
250 | ret = -EINVAL; | |
251 | goto fail; | |
252 | } | |
253 | s->l1_size = l1_size; | |
254 | } | |
ea2384d3 FB |
255 | |
256 | s->l1_table_offset = header.l1_table_offset; | |
5839e53b | 257 | s->l1_table = g_try_new(uint64_t, s->l1_size); |
0df93305 KW |
258 | if (s->l1_table == NULL) { |
259 | error_setg(errp, "Could not allocate memory for L1 table"); | |
260 | ret = -ENOMEM; | |
261 | goto fail; | |
262 | } | |
84b0ec02 | 263 | |
32cc71de AF |
264 | ret = bdrv_pread(bs->file, s->l1_table_offset, |
265 | s->l1_size * sizeof(uint64_t), s->l1_table, 0); | |
84b0ec02 | 266 | if (ret < 0) { |
ea2384d3 | 267 | goto fail; |
84b0ec02 LZH |
268 | } |
269 | ||
ea2384d3 | 270 | for(i = 0;i < s->l1_size; i++) { |
a5fdff18 | 271 | s->l1_table[i] = be64_to_cpu(s->l1_table[i]); |
ea2384d3 | 272 | } |
0df93305 KW |
273 | |
274 | /* alloc L2 cache (max. 64k * 16 * 8 = 8 MB) */ | |
275 | s->l2_cache = | |
9a4f4c31 | 276 | qemu_try_blockalign(bs->file->bs, |
0df93305 KW |
277 | s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
278 | if (s->l2_cache == NULL) { | |
279 | error_setg(errp, "Could not allocate L2 table cache"); | |
280 | ret = -ENOMEM; | |
281 | goto fail; | |
282 | } | |
7267c094 | 283 | s->cluster_cache = g_malloc(s->cluster_size); |
7267c094 | 284 | s->cluster_data = g_malloc(s->cluster_size); |
ea2384d3 | 285 | s->cluster_cache_offset = -1; |
3b46e624 | 286 | |
ea2384d3 FB |
287 | /* read the backing file name */ |
288 | if (header.backing_file_offset != 0) { | |
289 | len = header.backing_file_size; | |
e729fa6a | 290 | if (len > 1023 || len >= sizeof(bs->backing_file)) { |
d66e5cee KW |
291 | error_setg(errp, "Backing file name too long"); |
292 | ret = -EINVAL; | |
293 | goto fail; | |
84b0ec02 | 294 | } |
32cc71de AF |
295 | ret = bdrv_pread(bs->file, header.backing_file_offset, len, |
296 | bs->auto_backing_file, 0); | |
84b0ec02 | 297 | if (ret < 0) { |
ea2384d3 | 298 | goto fail; |
84b0ec02 | 299 | } |
998c2019 HR |
300 | bs->auto_backing_file[len] = '\0'; |
301 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), | |
302 | bs->auto_backing_file); | |
ea2384d3 | 303 | } |
de33b1f3 | 304 | |
fd9f102c | 305 | /* Disable migration when qcow images are used */ |
81e5f78a AG |
306 | error_setg(&s->migration_blocker, "The qcow format used by node '%s' " |
307 | "does not support live migration", | |
308 | bdrv_get_device_or_node_name(bs)); | |
4026f1c4 | 309 | |
e0ee3a8f | 310 | ret = migrate_add_blocker_normal(&s->migration_blocker, errp); |
386f6c07 | 311 | if (ret < 0) { |
fe44dc91 AA |
312 | goto fail; |
313 | } | |
fd9f102c | 314 | |
cb3e7f08 | 315 | qobject_unref(encryptopts); |
d85f4222 | 316 | qapi_free_QCryptoBlockOpenOptions(crypto_opts); |
de33b1f3 | 317 | qemu_co_mutex_init(&s->lock); |
a4b740db | 318 | bdrv_graph_rdunlock_main_loop(); |
ea2384d3 FB |
319 | return 0; |
320 | ||
a4b740db KW |
321 | fail: |
322 | bdrv_graph_rdunlock_main_loop(); | |
323 | fail_unlocked: | |
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 | */ |
c2b8e315 KW |
358 | static int coroutine_fn GRAPH_RDLOCK |
359 | get_cluster_offset(BlockDriverState *bs, uint64_t offset, int allocate, | |
360 | int compressed_size, int n_start, int n_end, | |
361 | 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 */ | |
0af02bd1 | 378 | l2_offset = bdrv_co_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); | |
17362398 | 387 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L1_UPDATE); |
58684155 AF |
388 | ret = bdrv_co_pwrite_sync(bs->file, |
389 | s->l1_table_offset + l1_index * sizeof(tmp), | |
390 | sizeof(tmp), &tmp, 0); | |
56439e9d EB |
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); | |
17362398 | 418 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L2_LOAD); |
ea2384d3 FB |
419 | if (new_l2_table) { |
420 | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); | |
58684155 AF |
421 | ret = bdrv_co_pwrite_sync(bs->file, l2_offset, |
422 | s->l2_size * sizeof(uint64_t), l2_table, 0); | |
56439e9d EB |
423 | if (ret < 0) { |
424 | return ret; | |
425 | } | |
ea2384d3 | 426 | } else { |
58684155 AF |
427 | ret = bdrv_co_pread(bs->file, l2_offset, |
428 | s->l2_size * sizeof(uint64_t), l2_table, 0); | |
56439e9d EB |
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; | |
17362398 | 442 | BLKDBG_CO_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 | } | |
0af02bd1 | 453 | cluster_offset = bdrv_co_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 */ |
17362398 | 459 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
58684155 AF |
460 | ret = bdrv_co_pwrite(bs->file, cluster_offset, s->cluster_size, |
461 | s->cluster_cache, 0); | |
56439e9d EB |
462 | if (ret < 0) { |
463 | return ret; | |
464 | } | |
ea2384d3 | 465 | } else { |
0af02bd1 | 466 | cluster_offset = bdrv_co_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 | } | |
58684155 AF |
476 | ret = bdrv_co_truncate(bs->file, |
477 | cluster_offset + s->cluster_size, | |
478 | false, PREALLOC_MODE_OFF, 0, NULL); | |
d7a753a1 EB |
479 | if (ret < 0) { |
480 | return ret; | |
481 | } | |
7f48fa1f AL |
482 | /* if encrypted, we must initialize the cluster |
483 | content which won't be written */ | |
8336aafa | 484 | if (bs->encrypted && |
787993a5 EB |
485 | (n_end - n_start) < s->cluster_size) { |
486 | uint64_t start_offset; | |
d85f4222 | 487 | assert(s->crypto); |
787993a5 EB |
488 | start_offset = offset & ~(s->cluster_size - 1); |
489 | for (i = 0; i < s->cluster_size; i += BDRV_SECTOR_SIZE) { | |
7f48fa1f | 490 | if (i < n_start || i >= n_end) { |
787993a5 | 491 | memset(s->cluster_data, 0x00, BDRV_SECTOR_SIZE); |
4609742a | 492 | if (qcrypto_block_encrypt(s->crypto, |
787993a5 | 493 | start_offset + i, |
d85f4222 DB |
494 | s->cluster_data, |
495 | BDRV_SECTOR_SIZE, | |
c3a8fe33 | 496 | NULL) < 0) { |
56439e9d EB |
497 | return -EIO; |
498 | } | |
17362398 | 499 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
58684155 AF |
500 | ret = bdrv_co_pwrite(bs->file, cluster_offset + i, |
501 | BDRV_SECTOR_SIZE, | |
502 | s->cluster_data, 0); | |
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 | 517 | if (allocate == 2) { |
17362398 | 518 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L2_UPDATE_COMPRESSED); |
0abb1475 | 519 | } else { |
17362398 | 520 | BLKDBG_CO_EVENT(bs->file, BLKDBG_L2_UPDATE); |
0abb1475 | 521 | } |
58684155 AF |
522 | ret = bdrv_co_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
523 | sizeof(tmp), &tmp, 0); | |
56439e9d EB |
524 | if (ret < 0) { |
525 | return ret; | |
526 | } | |
ea2384d3 | 527 | } |
56439e9d EB |
528 | *result = cluster_offset; |
529 | return 1; | |
ea2384d3 FB |
530 | } |
531 | ||
7ff9579e KW |
532 | static int coroutine_fn GRAPH_RDLOCK |
533 | qcow_co_block_status(BlockDriverState *bs, bool want_zero, | |
534 | int64_t offset, int64_t bytes, int64_t *pnum, | |
535 | int64_t *map, BlockDriverState **file) | |
ea2384d3 FB |
536 | { |
537 | BDRVQcowState *s = bs->opaque; | |
d63b4c93 EB |
538 | int index_in_cluster, ret; |
539 | int64_t n; | |
ea2384d3 FB |
540 | uint64_t cluster_offset; |
541 | ||
f8a2e5e3 | 542 | qemu_co_mutex_lock(&s->lock); |
d63b4c93 | 543 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
f8a2e5e3 | 544 | qemu_co_mutex_unlock(&s->lock); |
56439e9d EB |
545 | if (ret < 0) { |
546 | return ret; | |
547 | } | |
d63b4c93 EB |
548 | index_in_cluster = offset & (s->cluster_size - 1); |
549 | n = s->cluster_size - index_in_cluster; | |
550 | if (n > bytes) { | |
551 | n = bytes; | |
552 | } | |
ea2384d3 | 553 | *pnum = n; |
4bc74be9 PB |
554 | if (!cluster_offset) { |
555 | return 0; | |
556 | } | |
28482891 AD |
557 | if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
558 | return BDRV_BLOCK_DATA | BDRV_BLOCK_COMPRESSED; | |
559 | } | |
560 | if (s->crypto) { | |
4bc74be9 PB |
561 | return BDRV_BLOCK_DATA; |
562 | } | |
d63b4c93 | 563 | *map = cluster_offset | index_in_cluster; |
3064bf6f | 564 | *file = bs->file->bs; |
d63b4c93 | 565 | return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
ea2384d3 FB |
566 | } |
567 | ||
568 | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, | |
569 | const uint8_t *buf, int buf_size) | |
570 | { | |
571 | z_stream strm1, *strm = &strm1; | |
572 | int ret, out_len; | |
573 | ||
574 | memset(strm, 0, sizeof(*strm)); | |
575 | ||
576 | strm->next_in = (uint8_t *)buf; | |
577 | strm->avail_in = buf_size; | |
578 | strm->next_out = out_buf; | |
579 | strm->avail_out = out_buf_size; | |
580 | ||
581 | ret = inflateInit2(strm, -12); | |
582 | if (ret != Z_OK) | |
583 | return -1; | |
584 | ret = inflate(strm, Z_FINISH); | |
585 | out_len = strm->next_out - out_buf; | |
586 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || | |
587 | out_len != out_buf_size) { | |
588 | inflateEnd(strm); | |
589 | return -1; | |
590 | } | |
591 | inflateEnd(strm); | |
592 | return 0; | |
593 | } | |
3b46e624 | 594 | |
b9b10c35 KW |
595 | static int coroutine_fn GRAPH_RDLOCK |
596 | decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) | |
ea2384d3 | 597 | { |
66f82cee | 598 | BDRVQcowState *s = bs->opaque; |
ea2384d3 FB |
599 | int ret, csize; |
600 | uint64_t coffset; | |
601 | ||
602 | coffset = cluster_offset & s->cluster_offset_mask; | |
603 | if (s->cluster_cache_offset != coffset) { | |
604 | csize = cluster_offset >> (63 - s->cluster_bits); | |
605 | csize &= (s->cluster_size - 1); | |
17362398 | 606 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_COMPRESSED); |
58684155 | 607 | ret = bdrv_co_pread(bs->file, coffset, csize, s->cluster_data, 0); |
353a5d84 | 608 | if (ret < 0) |
ea2384d3 FB |
609 | return -1; |
610 | if (decompress_buffer(s->cluster_cache, s->cluster_size, | |
611 | s->cluster_data, csize) < 0) { | |
612 | return -1; | |
613 | } | |
614 | s->cluster_cache_offset = coffset; | |
615 | } | |
616 | return 0; | |
617 | } | |
618 | ||
609841a3 EB |
619 | static void qcow_refresh_limits(BlockDriverState *bs, Error **errp) |
620 | { | |
621 | /* At least encrypted images require 512-byte alignment. Apply the | |
622 | * limit universally, rather than just on encrypted images, as | |
623 | * it's easier to let the block layer handle rounding than to | |
624 | * audit this code further. */ | |
625 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; | |
626 | } | |
627 | ||
7b1fb72e KW |
628 | static int coroutine_fn GRAPH_RDLOCK |
629 | qcow_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
630 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
83f64091 | 631 | { |
83f64091 | 632 | BDRVQcowState *s = bs->opaque; |
a15312b0 | 633 | int offset_in_cluster; |
27deebe8 | 634 | int ret = 0, n; |
43ca85b5 | 635 | uint64_t cluster_offset; |
27deebe8 FZ |
636 | uint8_t *buf; |
637 | void *orig_buf; | |
83f64091 | 638 | |
27deebe8 | 639 | if (qiov->niov > 1) { |
0df93305 KW |
640 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
641 | if (buf == NULL) { | |
642 | return -ENOMEM; | |
643 | } | |
27deebe8 FZ |
644 | } else { |
645 | orig_buf = NULL; | |
646 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 647 | } |
3b46e624 | 648 | |
27deebe8 FZ |
649 | qemu_co_mutex_lock(&s->lock); |
650 | ||
a15312b0 | 651 | while (bytes != 0) { |
27deebe8 | 652 | /* prepare next request */ |
a15312b0 | 653 | ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset); |
56439e9d EB |
654 | if (ret < 0) { |
655 | break; | |
656 | } | |
a15312b0 EB |
657 | offset_in_cluster = offset & (s->cluster_size - 1); |
658 | n = s->cluster_size - offset_in_cluster; | |
659 | if (n > bytes) { | |
660 | n = bytes; | |
27deebe8 | 661 | } |
ce1a14dc | 662 | |
27deebe8 | 663 | if (!cluster_offset) { |
760e0063 | 664 | if (bs->backing) { |
27deebe8 | 665 | /* read from the base image */ |
27deebe8 | 666 | qemu_co_mutex_unlock(&s->lock); |
0abb1475 | 667 | /* qcow2 emits this on bs->file instead of bs->backing */ |
17362398 | 668 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
4ed3e0c4 | 669 | ret = bdrv_co_pread(bs->backing, offset, n, buf, 0); |
27deebe8 FZ |
670 | qemu_co_mutex_lock(&s->lock); |
671 | if (ret < 0) { | |
56439e9d | 672 | break; |
27deebe8 FZ |
673 | } |
674 | } else { | |
675 | /* Note: in this case, no need to wait */ | |
a15312b0 | 676 | memset(buf, 0, n); |
27deebe8 FZ |
677 | } |
678 | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { | |
679 | /* add AIO support for compressed blocks ? */ | |
680 | if (decompress_cluster(bs, cluster_offset) < 0) { | |
56439e9d EB |
681 | ret = -EIO; |
682 | break; | |
27deebe8 | 683 | } |
a15312b0 | 684 | memcpy(buf, s->cluster_cache + offset_in_cluster, n); |
27deebe8 FZ |
685 | } else { |
686 | if ((cluster_offset & 511) != 0) { | |
56439e9d EB |
687 | ret = -EIO; |
688 | break; | |
27deebe8 | 689 | } |
52b8eb60 | 690 | qemu_co_mutex_unlock(&s->lock); |
17362398 | 691 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_AIO); |
4ed3e0c4 VSO |
692 | ret = bdrv_co_pread(bs->file, cluster_offset + offset_in_cluster, |
693 | n, buf, 0); | |
52b8eb60 KW |
694 | qemu_co_mutex_lock(&s->lock); |
695 | if (ret < 0) { | |
27deebe8 FZ |
696 | break; |
697 | } | |
8336aafa | 698 | if (bs->encrypted) { |
d85f4222 | 699 | assert(s->crypto); |
4609742a | 700 | if (qcrypto_block_decrypt(s->crypto, |
a15312b0 | 701 | offset, buf, n, NULL) < 0) { |
56439e9d EB |
702 | ret = -EIO; |
703 | break; | |
f6fa64f6 | 704 | } |
5614c188 | 705 | } |
5614c188 | 706 | } |
27deebe8 | 707 | ret = 0; |
f141eafe | 708 | |
a15312b0 EB |
709 | bytes -= n; |
710 | offset += n; | |
711 | buf += n; | |
43ca85b5 FZ |
712 | } |
713 | ||
52b8eb60 KW |
714 | qemu_co_mutex_unlock(&s->lock); |
715 | ||
27deebe8 | 716 | if (qiov->niov > 1) { |
03396148 | 717 | qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size); |
27deebe8 | 718 | qemu_vfree(orig_buf); |
b11a24de KW |
719 | } |
720 | ||
52b8eb60 | 721 | return ret; |
83f64091 FB |
722 | } |
723 | ||
7b1fb72e KW |
724 | static int coroutine_fn GRAPH_RDLOCK |
725 | qcow_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
726 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
83f64091 | 727 | { |
83f64091 | 728 | BDRVQcowState *s = bs->opaque; |
d1326a78 | 729 | int offset_in_cluster; |
83f64091 | 730 | uint64_t cluster_offset; |
27deebe8 | 731 | int ret = 0, n; |
27deebe8 FZ |
732 | uint8_t *buf; |
733 | void *orig_buf; | |
ce1a14dc | 734 | |
27deebe8 | 735 | s->cluster_cache_offset = -1; /* disable compressed cache */ |
3b46e624 | 736 | |
1fad1f94 DB |
737 | /* We must always copy the iov when encrypting, so we |
738 | * don't modify the original data buffer during encryption */ | |
739 | if (bs->encrypted || qiov->niov > 1) { | |
0df93305 KW |
740 | buf = orig_buf = qemu_try_blockalign(bs, qiov->size); |
741 | if (buf == NULL) { | |
742 | return -ENOMEM; | |
743 | } | |
d5e6b161 | 744 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
83f64091 | 745 | } else { |
27deebe8 FZ |
746 | orig_buf = NULL; |
747 | buf = (uint8_t *)qiov->iov->iov_base; | |
83f64091 | 748 | } |
c87c0672 | 749 | |
52b8eb60 | 750 | qemu_co_mutex_lock(&s->lock); |
43ca85b5 | 751 | |
d1326a78 EB |
752 | while (bytes != 0) { |
753 | offset_in_cluster = offset & (s->cluster_size - 1); | |
754 | n = s->cluster_size - offset_in_cluster; | |
755 | if (n > bytes) { | |
756 | n = bytes; | |
27deebe8 | 757 | } |
d1326a78 EB |
758 | ret = get_cluster_offset(bs, offset, 1, 0, offset_in_cluster, |
759 | offset_in_cluster + n, &cluster_offset); | |
56439e9d EB |
760 | if (ret < 0) { |
761 | break; | |
762 | } | |
27deebe8 FZ |
763 | if (!cluster_offset || (cluster_offset & 511) != 0) { |
764 | ret = -EIO; | |
765 | break; | |
766 | } | |
8336aafa | 767 | if (bs->encrypted) { |
d85f4222 | 768 | assert(s->crypto); |
d1326a78 | 769 | if (qcrypto_block_encrypt(s->crypto, offset, buf, n, NULL) < 0) { |
f6fa64f6 DB |
770 | ret = -EIO; |
771 | break; | |
772 | } | |
27deebe8 | 773 | } |
83f64091 | 774 | |
27deebe8 | 775 | qemu_co_mutex_unlock(&s->lock); |
17362398 | 776 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
4ed3e0c4 VSO |
777 | ret = bdrv_co_pwrite(bs->file, cluster_offset + offset_in_cluster, |
778 | n, buf, 0); | |
27deebe8 FZ |
779 | qemu_co_mutex_lock(&s->lock); |
780 | if (ret < 0) { | |
781 | break; | |
782 | } | |
783 | ret = 0; | |
ad53089b | 784 | |
d1326a78 EB |
785 | bytes -= n; |
786 | offset += n; | |
787 | buf += n; | |
27deebe8 | 788 | } |
52b8eb60 | 789 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 790 | |
1fad1f94 | 791 | qemu_vfree(orig_buf); |
b11a24de | 792 | |
52b8eb60 | 793 | return ret; |
83f64091 FB |
794 | } |
795 | ||
e2731add | 796 | static void qcow_close(BlockDriverState *bs) |
ea2384d3 FB |
797 | { |
798 | BDRVQcowState *s = bs->opaque; | |
fd9f102c | 799 | |
d85f4222 DB |
800 | qcrypto_block_free(s->crypto); |
801 | s->crypto = NULL; | |
7267c094 | 802 | g_free(s->l1_table); |
0df93305 | 803 | qemu_vfree(s->l2_cache); |
7267c094 AL |
804 | g_free(s->cluster_cache); |
805 | g_free(s->cluster_data); | |
fd9f102c | 806 | |
c8a7fc51 | 807 | migrate_del_blocker(&s->migration_blocker); |
ea2384d3 FB |
808 | } |
809 | ||
4db7ba3b KW |
810 | static int coroutine_fn GRAPH_UNLOCKED |
811 | qcow_co_create(BlockdevCreateOptions *opts, Error **errp) | |
ea2384d3 | 812 | { |
42a3e1ab | 813 | BlockdevCreateOptionsQcow *qcow_opts; |
2b16c9ff | 814 | int header_size, backing_filename_len, l1_size, shift, i; |
ea2384d3 | 815 | QCowHeader header; |
2b16c9ff | 816 | uint8_t *tmp; |
0e7e1989 | 817 | int64_t total_size = 0; |
3e1a8134 | 818 | int ret; |
42a3e1ab | 819 | BlockDriverState *bs; |
6af40160 | 820 | BlockBackend *qcow_blk; |
d85f4222 | 821 | QCryptoBlock *crypto = NULL; |
0e7e1989 | 822 | |
42a3e1ab KW |
823 | assert(opts->driver == BLOCKDEV_DRIVER_QCOW); |
824 | qcow_opts = &opts->u.qcow; | |
825 | ||
826 | /* Sanity checks */ | |
827 | total_size = qcow_opts->size; | |
6aa837f7 DB |
828 | if (total_size == 0) { |
829 | error_setg(errp, "Image size is too small, cannot be zero length"); | |
42a3e1ab | 830 | return -EINVAL; |
6aa837f7 DB |
831 | } |
832 | ||
54fde4ff | 833 | if (qcow_opts->encrypt && |
42a3e1ab KW |
834 | qcow_opts->encrypt->format != Q_CRYPTO_BLOCK_FORMAT_QCOW) |
835 | { | |
836 | error_setg(errp, "Unsupported encryption format"); | |
837 | return -EINVAL; | |
0e7e1989 | 838 | } |
ea2384d3 | 839 | |
42a3e1ab | 840 | /* Create BlockBackend to write to the image */ |
5b9d79b6 | 841 | bs = bdrv_co_open_blockdev_ref(qcow_opts->file, errp); |
42a3e1ab KW |
842 | if (bs == NULL) { |
843 | return -EIO; | |
2b16c9ff LZH |
844 | } |
845 | ||
5b9d79b6 KW |
846 | qcow_blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, |
847 | BLK_PERM_ALL, errp); | |
a3aeeab5 EB |
848 | if (!qcow_blk) { |
849 | ret = -EPERM; | |
42a3e1ab | 850 | goto exit; |
2b16c9ff | 851 | } |
6af40160 KW |
852 | blk_set_allow_write_beyond_eof(qcow_blk, true); |
853 | ||
42a3e1ab | 854 | /* Create image format */ |
ea2384d3 FB |
855 | memset(&header, 0, sizeof(header)); |
856 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
857 | header.version = cpu_to_be32(QCOW_VERSION); | |
180e9526 | 858 | header.size = cpu_to_be64(total_size); |
ea2384d3 FB |
859 | header_size = sizeof(header); |
860 | backing_filename_len = 0; | |
54fde4ff | 861 | if (qcow_opts->backing_file) { |
42a3e1ab | 862 | if (strcmp(qcow_opts->backing_file, "fat:")) { |
7852e5da | 863 | header.backing_file_offset = cpu_to_be64(header_size); |
42a3e1ab | 864 | backing_filename_len = strlen(qcow_opts->backing_file); |
7852e5da AJ |
865 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
866 | header_size += backing_filename_len; | |
867 | } else { | |
868 | /* special backing file for vvfat */ | |
54fde4ff | 869 | qcow_opts->backing_file = NULL; |
7852e5da | 870 | } |
ea2384d3 | 871 | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
dc6fb73d | 872 | unmodified sectors */ |
ea2384d3 FB |
873 | header.l2_bits = 12; /* 32 KB L2 tables */ |
874 | } else { | |
875 | header.cluster_bits = 12; /* 4 KB clusters */ | |
876 | header.l2_bits = 9; /* 4 KB L2 tables */ | |
877 | } | |
878 | header_size = (header_size + 7) & ~7; | |
879 | shift = header.cluster_bits + header.l2_bits; | |
180e9526 | 880 | l1_size = (total_size + (1LL << shift) - 1) >> shift; |
ea2384d3 FB |
881 | |
882 | header.l1_table_offset = cpu_to_be64(header_size); | |
d85f4222 | 883 | |
54fde4ff | 884 | if (qcow_opts->encrypt) { |
ea2384d3 | 885 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
d85f4222 | 886 | |
42a3e1ab | 887 | crypto = qcrypto_block_create(qcow_opts->encrypt, "encrypt.", |
1cd9a787 | 888 | NULL, NULL, NULL, errp); |
d85f4222 DB |
889 | if (!crypto) { |
890 | ret = -EINVAL; | |
891 | goto exit; | |
892 | } | |
ea2384d3 FB |
893 | } else { |
894 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
895 | } | |
3b46e624 | 896 | |
ea2384d3 | 897 | /* write all the data */ |
58684155 | 898 | ret = blk_co_pwrite(qcow_blk, 0, sizeof(header), &header, 0); |
bf5b16fa | 899 | if (ret < 0) { |
3e1a8134 KS |
900 | goto exit; |
901 | } | |
902 | ||
54fde4ff | 903 | if (qcow_opts->backing_file) { |
58684155 AF |
904 | ret = blk_co_pwrite(qcow_blk, sizeof(header), backing_filename_len, |
905 | qcow_opts->backing_file, 0); | |
bf5b16fa | 906 | if (ret < 0) { |
3e1a8134 KS |
907 | goto exit; |
908 | } | |
ea2384d3 | 909 | } |
2b16c9ff LZH |
910 | |
911 | tmp = g_malloc0(BDRV_SECTOR_SIZE); | |
d737b78c LV |
912 | for (i = 0; i < DIV_ROUND_UP(sizeof(uint64_t) * l1_size, BDRV_SECTOR_SIZE); |
913 | i++) { | |
58684155 AF |
914 | ret = blk_co_pwrite(qcow_blk, header_size + BDRV_SECTOR_SIZE * i, |
915 | BDRV_SECTOR_SIZE, tmp, 0); | |
bf5b16fa | 916 | if (ret < 0) { |
2b16c9ff | 917 | g_free(tmp); |
3e1a8134 KS |
918 | goto exit; |
919 | } | |
ea2384d3 | 920 | } |
3e1a8134 | 921 | |
2b16c9ff | 922 | g_free(tmp); |
3e1a8134 KS |
923 | ret = 0; |
924 | exit: | |
b2ab5f54 KW |
925 | blk_co_unref(qcow_blk); |
926 | bdrv_co_unref(bs); | |
d85f4222 | 927 | qcrypto_block_free(crypto); |
42a3e1ab KW |
928 | return ret; |
929 | } | |
930 | ||
4db7ba3b | 931 | static int coroutine_fn GRAPH_UNLOCKED |
4ec8df01 KW |
932 | qcow_co_create_opts(BlockDriver *drv, const char *filename, |
933 | QemuOpts *opts, Error **errp) | |
42a3e1ab KW |
934 | { |
935 | BlockdevCreateOptions *create_options = NULL; | |
936 | BlockDriverState *bs = NULL; | |
344acbd6 | 937 | QDict *qdict = NULL; |
42a3e1ab KW |
938 | Visitor *v; |
939 | const char *val; | |
42a3e1ab | 940 | int ret; |
344acbd6 | 941 | char *backing_fmt; |
42a3e1ab KW |
942 | |
943 | static const QDictRenames opt_renames[] = { | |
944 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, | |
945 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, | |
946 | { NULL, NULL }, | |
947 | }; | |
948 | ||
344acbd6 EB |
949 | /* |
950 | * We can't actually store a backing format, but can check that | |
951 | * the user's request made sense. | |
952 | */ | |
953 | backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT); | |
954 | if (backing_fmt && !bdrv_find_format(backing_fmt)) { | |
955 | error_setg(errp, "unrecognized backing format '%s'", backing_fmt); | |
956 | ret = -EINVAL; | |
957 | goto fail; | |
958 | } | |
959 | ||
42a3e1ab KW |
960 | /* Parse options and convert legacy syntax */ |
961 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, &qcow_create_opts, true); | |
962 | ||
963 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); | |
964 | if (val && !strcmp(val, "on")) { | |
965 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow"); | |
966 | } else if (val && !strcmp(val, "off")) { | |
967 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); | |
968 | } | |
969 | ||
970 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); | |
971 | if (val && !strcmp(val, "aes")) { | |
972 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow"); | |
973 | } | |
974 | ||
975 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
976 | ret = -EINVAL; | |
977 | goto fail; | |
978 | } | |
979 | ||
980 | /* Create and open the file (protocol layer) */ | |
2475a0d0 | 981 | ret = bdrv_co_create_file(filename, opts, errp); |
42a3e1ab | 982 | if (ret < 0) { |
42a3e1ab KW |
983 | goto fail; |
984 | } | |
985 | ||
5b9d79b6 KW |
986 | bs = bdrv_co_open(filename, NULL, NULL, |
987 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
42a3e1ab KW |
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 | ||
af91062e MA |
997 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
998 | if (!v) { | |
42a3e1ab KW |
999 | ret = -EINVAL; |
1000 | goto fail; | |
1001 | } | |
1002 | ||
b11a093c | 1003 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
42a3e1ab | 1004 | visit_free(v); |
b11a093c | 1005 | if (!create_options) { |
42a3e1ab KW |
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: | |
344acbd6 | 1023 | g_free(backing_fmt); |
cb3e7f08 | 1024 | qobject_unref(qdict); |
b2ab5f54 | 1025 | bdrv_co_unref(bs); |
42a3e1ab | 1026 | qapi_free_BlockdevCreateOptions(create_options); |
3e1a8134 | 1027 | return ret; |
ea2384d3 FB |
1028 | } |
1029 | ||
79a55866 | 1030 | static int GRAPH_RDLOCK qcow_make_empty(BlockDriverState *bs) |
95389c86 FB |
1031 | { |
1032 | BDRVQcowState *s = bs->opaque; | |
1033 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
83f64091 | 1034 | int ret; |
95389c86 FB |
1035 | |
1036 | memset(s->l1_table, 0, l1_length); | |
32cc71de | 1037 | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, l1_length, s->l1_table, |
53fb7844 | 1038 | 0) < 0) |
5e5557d9 | 1039 | return -1; |
c80d8b06 | 1040 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length, false, |
7b8e4857 | 1041 | PREALLOC_MODE_OFF, 0, NULL); |
83f64091 FB |
1042 | if (ret < 0) |
1043 | return ret; | |
95389c86 FB |
1044 | |
1045 | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); | |
1046 | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); | |
1047 | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
ea2384d3 FB |
1052 | /* XXX: put compressed sectors first, then all the cluster aligned |
1053 | tables to avoid losing bytes in alignment */ | |
7b1fb72e | 1054 | static int coroutine_fn GRAPH_RDLOCK |
e75abeda VSO |
1055 | qcow_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes, |
1056 | QEMUIOVector *qiov) | |
ea2384d3 FB |
1057 | { |
1058 | BDRVQcowState *s = bs->opaque; | |
1059 | z_stream strm; | |
1060 | int ret, out_len; | |
f2b95a12 | 1061 | uint8_t *buf, *out_buf; |
ea2384d3 FB |
1062 | uint64_t cluster_offset; |
1063 | ||
655923df | 1064 | buf = qemu_blockalign(bs, s->cluster_size); |
f2b95a12 | 1065 | if (bytes != s->cluster_size) { |
655923df PB |
1066 | if (bytes > s->cluster_size || |
1067 | offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) | |
f2b95a12 | 1068 | { |
655923df PB |
1069 | qemu_vfree(buf); |
1070 | return -EINVAL; | |
16b3c5cd | 1071 | } |
655923df PB |
1072 | /* Zero-pad last write if image size is not cluster aligned */ |
1073 | memset(buf + bytes, 0, s->cluster_size - bytes); | |
16b3c5cd | 1074 | } |
f2b95a12 | 1075 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
ea2384d3 | 1076 | |
ebf7bba0 | 1077 | out_buf = g_malloc(s->cluster_size); |
ea2384d3 FB |
1078 | |
1079 | /* best compression, small window, no zlib header */ | |
1080 | memset(&strm, 0, sizeof(strm)); | |
1081 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
5fafdf24 | 1082 | Z_DEFLATED, -12, |
ea2384d3 FB |
1083 | 9, Z_DEFAULT_STRATEGY); |
1084 | if (ret != 0) { | |
64ebe71a KW |
1085 | ret = -EINVAL; |
1086 | goto fail; | |
ea2384d3 FB |
1087 | } |
1088 | ||
1089 | strm.avail_in = s->cluster_size; | |
1090 | strm.next_in = (uint8_t *)buf; | |
1091 | strm.avail_out = s->cluster_size; | |
1092 | strm.next_out = out_buf; | |
1093 | ||
1094 | ret = deflate(&strm, Z_FINISH); | |
1095 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
ea2384d3 | 1096 | deflateEnd(&strm); |
64ebe71a KW |
1097 | ret = -EINVAL; |
1098 | goto fail; | |
ea2384d3 FB |
1099 | } |
1100 | out_len = strm.next_out - out_buf; | |
1101 | ||
1102 | deflateEnd(&strm); | |
1103 | ||
1104 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1105 | /* could not compress: write normal cluster */ | |
609841a3 | 1106 | ret = qcow_co_pwritev(bs, offset, bytes, qiov, 0); |
64ebe71a KW |
1107 | if (ret < 0) { |
1108 | goto fail; | |
ea2384d3 | 1109 | } |
f2b95a12 PB |
1110 | goto success; |
1111 | } | |
1112 | qemu_co_mutex_lock(&s->lock); | |
56439e9d | 1113 | ret = get_cluster_offset(bs, offset, 2, out_len, 0, 0, &cluster_offset); |
f2b95a12 | 1114 | qemu_co_mutex_unlock(&s->lock); |
56439e9d EB |
1115 | if (ret < 0) { |
1116 | goto fail; | |
1117 | } | |
f2b95a12 PB |
1118 | if (cluster_offset == 0) { |
1119 | ret = -EIO; | |
1120 | goto fail; | |
ea2384d3 | 1121 | } |
f2b95a12 | 1122 | cluster_offset &= s->cluster_offset_mask; |
3b46e624 | 1123 | |
17362398 | 1124 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
4ed3e0c4 | 1125 | ret = bdrv_co_pwrite(bs->file, cluster_offset, out_len, out_buf, 0); |
f2b95a12 PB |
1126 | if (ret < 0) { |
1127 | goto fail; | |
1128 | } | |
1129 | success: | |
64ebe71a KW |
1130 | ret = 0; |
1131 | fail: | |
f2b95a12 | 1132 | qemu_vfree(buf); |
7267c094 | 1133 | g_free(out_buf); |
64ebe71a | 1134 | return ret; |
ea2384d3 FB |
1135 | } |
1136 | ||
3d47eb0a EGE |
1137 | static int coroutine_fn |
1138 | qcow_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
c47c33b0 FB |
1139 | { |
1140 | BDRVQcowState *s = bs->opaque; | |
1141 | bdi->cluster_size = s->cluster_size; | |
1142 | return 0; | |
1143 | } | |
1144 | ||
16d12159 CL |
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 | }, | |
344acbd6 EB |
1159 | { |
1160 | .name = BLOCK_OPT_BACKING_FMT, | |
1161 | .type = QEMU_OPT_STRING, | |
1162 | .help = "Format of the backing image", | |
1163 | }, | |
16d12159 CL |
1164 | { |
1165 | .name = BLOCK_OPT_ENCRYPT, | |
1166 | .type = QEMU_OPT_BOOL, | |
0cb8d47b DB |
1167 | .help = "Encrypt the image with format 'aes'. (Deprecated " |
1168 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)", | |
1169 | }, | |
1170 | { | |
1171 | .name = BLOCK_OPT_ENCRYPT_FORMAT, | |
1172 | .type = QEMU_OPT_STRING, | |
1173 | .help = "Encrypt the image, format choices: 'aes'", | |
16d12159 | 1174 | }, |
d85f4222 | 1175 | BLOCK_CRYPTO_OPT_DEF_QCOW_KEY_SECRET("encrypt."), |
16d12159 CL |
1176 | { /* end of list */ } |
1177 | } | |
0e7e1989 KW |
1178 | }; |
1179 | ||
2654267c HR |
1180 | static const char *const qcow_strong_runtime_opts[] = { |
1181 | "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET, | |
1182 | ||
1183 | NULL | |
1184 | }; | |
1185 | ||
5efa9d5a | 1186 | static BlockDriver bdrv_qcow = { |
e60f469c AJ |
1187 | .format_name = "qcow", |
1188 | .instance_size = sizeof(BDRVQcowState), | |
1189 | .bdrv_probe = qcow_probe, | |
1190 | .bdrv_open = qcow_open, | |
1191 | .bdrv_close = qcow_close, | |
69dca43d | 1192 | .bdrv_child_perm = bdrv_default_perms, |
16d12159 | 1193 | .bdrv_reopen_prepare = qcow_reopen_prepare, |
42a3e1ab | 1194 | .bdrv_co_create = qcow_co_create, |
efc75e2a | 1195 | .bdrv_co_create_opts = qcow_co_create_opts, |
3ac21627 | 1196 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
d67066d8 | 1197 | .is_format = true, |
8ee79e70 | 1198 | .supports_backing = true, |
609841a3 | 1199 | .bdrv_refresh_limits = qcow_refresh_limits, |
c68b89ac | 1200 | |
609841a3 EB |
1201 | .bdrv_co_preadv = qcow_co_preadv, |
1202 | .bdrv_co_pwritev = qcow_co_pwritev, | |
d63b4c93 | 1203 | .bdrv_co_block_status = qcow_co_block_status, |
c68b89ac | 1204 | |
c68b89ac | 1205 | .bdrv_make_empty = qcow_make_empty, |
f2b95a12 | 1206 | .bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed, |
3d47eb0a | 1207 | .bdrv_co_get_info = qcow_co_get_info, |
0e7e1989 | 1208 | |
16d12159 | 1209 | .create_opts = &qcow_create_opts, |
2654267c | 1210 | .strong_runtime_opts = qcow_strong_runtime_opts, |
ea2384d3 | 1211 | }; |
5efa9d5a AL |
1212 | |
1213 | static void bdrv_qcow_init(void) | |
1214 | { | |
1215 | bdrv_register(&bdrv_qcow); | |
1216 | } | |
1217 | ||
1218 | block_init(bdrv_qcow_init); |