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Commit | Line | Data |
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585f8587 FB |
1 | /* |
2 | * Block driver for the QCOW version 2 format | |
5fafdf24 | 3 | * |
585f8587 | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5fafdf24 | 5 | * |
585f8587 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
585f8587 | 25 | #include "block_int.h" |
5efa9d5a | 26 | #include "module.h" |
585f8587 FB |
27 | #include <zlib.h> |
28 | #include "aes.h" | |
f7d0fe02 | 29 | #include "block/qcow2.h" |
a9420734 | 30 | #include "qemu-error.h" |
e8cdcec1 | 31 | #include "qerror.h" |
3cce16f4 | 32 | #include "trace.h" |
585f8587 FB |
33 | |
34 | /* | |
35 | Differences with QCOW: | |
36 | ||
37 | - Support for multiple incremental snapshots. | |
38 | - Memory management by reference counts. | |
39 | - Clusters which have a reference count of one have the bit | |
40 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 41 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
42 | in the cluster offsets. |
43 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 44 | snapshots. |
585f8587 FB |
45 | - If a backing store is used, the cluster size is not constrained |
46 | (could be backported to QCOW). | |
47 | - L2 tables have always a size of one cluster. | |
48 | */ | |
49 | ||
9b80ddf3 AL |
50 | |
51 | typedef struct { | |
52 | uint32_t magic; | |
53 | uint32_t len; | |
54 | } QCowExtension; | |
7c80ab3f JS |
55 | #define QCOW2_EXT_MAGIC_END 0 |
56 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
9b80ddf3 | 57 | |
7c80ab3f | 58 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
59 | { |
60 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 61 | |
585f8587 FB |
62 | if (buf_size >= sizeof(QCowHeader) && |
63 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 64 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
65 | return 100; |
66 | else | |
67 | return 0; | |
68 | } | |
69 | ||
9b80ddf3 AL |
70 | |
71 | /* | |
72 | * read qcow2 extension and fill bs | |
73 | * start reading from start_offset | |
74 | * finish reading upon magic of value 0 or when end_offset reached | |
75 | * unknown magic is skipped (future extension this version knows nothing about) | |
76 | * return 0 upon success, non-0 otherwise | |
77 | */ | |
7c80ab3f JS |
78 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
79 | uint64_t end_offset) | |
9b80ddf3 | 80 | { |
75bab85c | 81 | BDRVQcowState *s = bs->opaque; |
9b80ddf3 AL |
82 | QCowExtension ext; |
83 | uint64_t offset; | |
75bab85c | 84 | int ret; |
9b80ddf3 AL |
85 | |
86 | #ifdef DEBUG_EXT | |
7c80ab3f | 87 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
88 | #endif |
89 | offset = start_offset; | |
90 | while (offset < end_offset) { | |
91 | ||
92 | #ifdef DEBUG_EXT | |
93 | /* Sanity check */ | |
94 | if (offset > s->cluster_size) | |
7c80ab3f | 95 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 96 | |
9b2260cb | 97 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
98 | #endif |
99 | ||
66f82cee | 100 | if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
7c80ab3f | 101 | fprintf(stderr, "qcow2_read_extension: ERROR: " |
0bfcd599 BS |
102 | "pread fail from offset %" PRIu64 "\n", |
103 | offset); | |
9b80ddf3 AL |
104 | return 1; |
105 | } | |
106 | be32_to_cpus(&ext.magic); | |
107 | be32_to_cpus(&ext.len); | |
108 | offset += sizeof(ext); | |
109 | #ifdef DEBUG_EXT | |
110 | printf("ext.magic = 0x%x\n", ext.magic); | |
111 | #endif | |
64ca6aee KW |
112 | if (ext.len > end_offset - offset) { |
113 | error_report("Header extension too large"); | |
114 | return -EINVAL; | |
115 | } | |
116 | ||
9b80ddf3 | 117 | switch (ext.magic) { |
7c80ab3f | 118 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 119 | return 0; |
f965509c | 120 | |
7c80ab3f | 121 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c AL |
122 | if (ext.len >= sizeof(bs->backing_format)) { |
123 | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large" | |
4c978075 | 124 | " (>=%zu)\n", |
f965509c AL |
125 | ext.len, sizeof(bs->backing_format)); |
126 | return 2; | |
127 | } | |
66f82cee | 128 | if (bdrv_pread(bs->file, offset , bs->backing_format, |
f965509c AL |
129 | ext.len) != ext.len) |
130 | return 3; | |
131 | bs->backing_format[ext.len] = '\0'; | |
132 | #ifdef DEBUG_EXT | |
133 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
134 | #endif | |
f965509c AL |
135 | break; |
136 | ||
9b80ddf3 | 137 | default: |
75bab85c KW |
138 | /* unknown magic - save it in case we need to rewrite the header */ |
139 | { | |
140 | Qcow2UnknownHeaderExtension *uext; | |
141 | ||
142 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
143 | uext->magic = ext.magic; | |
144 | uext->len = ext.len; | |
145 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
146 | ||
147 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); | |
148 | if (ret < 0) { | |
149 | return ret; | |
150 | } | |
75bab85c | 151 | } |
9b80ddf3 AL |
152 | break; |
153 | } | |
fd29b4bb KW |
154 | |
155 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
156 | } |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
75bab85c KW |
161 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
162 | { | |
163 | BDRVQcowState *s = bs->opaque; | |
164 | Qcow2UnknownHeaderExtension *uext, *next; | |
165 | ||
166 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
167 | QLIST_REMOVE(uext, next); | |
168 | g_free(uext); | |
169 | } | |
170 | } | |
9b80ddf3 | 171 | |
6744cbab KW |
172 | static void report_unsupported(BlockDriverState *bs, const char *fmt, ...) |
173 | { | |
174 | char msg[64]; | |
175 | va_list ap; | |
176 | ||
177 | va_start(ap, fmt); | |
178 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
179 | va_end(ap); | |
180 | ||
181 | qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, | |
182 | bs->device_name, "qcow2", msg); | |
183 | } | |
184 | ||
7c80ab3f | 185 | static int qcow2_open(BlockDriverState *bs, int flags) |
585f8587 FB |
186 | { |
187 | BDRVQcowState *s = bs->opaque; | |
6d85a57e | 188 | int len, i, ret = 0; |
585f8587 | 189 | QCowHeader header; |
9b80ddf3 | 190 | uint64_t ext_end; |
29c1a730 | 191 | bool writethrough; |
585f8587 | 192 | |
6d85a57e JS |
193 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
194 | if (ret < 0) { | |
585f8587 | 195 | goto fail; |
6d85a57e | 196 | } |
585f8587 FB |
197 | be32_to_cpus(&header.magic); |
198 | be32_to_cpus(&header.version); | |
199 | be64_to_cpus(&header.backing_file_offset); | |
200 | be32_to_cpus(&header.backing_file_size); | |
201 | be64_to_cpus(&header.size); | |
202 | be32_to_cpus(&header.cluster_bits); | |
203 | be32_to_cpus(&header.crypt_method); | |
204 | be64_to_cpus(&header.l1_table_offset); | |
205 | be32_to_cpus(&header.l1_size); | |
206 | be64_to_cpus(&header.refcount_table_offset); | |
207 | be32_to_cpus(&header.refcount_table_clusters); | |
208 | be64_to_cpus(&header.snapshots_offset); | |
209 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 210 | |
e8cdcec1 | 211 | if (header.magic != QCOW_MAGIC) { |
6d85a57e | 212 | ret = -EINVAL; |
585f8587 | 213 | goto fail; |
6d85a57e | 214 | } |
6744cbab KW |
215 | if (header.version < 2 || header.version > 3) { |
216 | report_unsupported(bs, "QCOW version %d", header.version); | |
217 | ret = -ENOTSUP; | |
218 | goto fail; | |
219 | } | |
220 | ||
221 | s->qcow_version = header.version; | |
222 | ||
223 | /* Initialise version 3 header fields */ | |
224 | if (header.version == 2) { | |
225 | header.incompatible_features = 0; | |
226 | header.compatible_features = 0; | |
227 | header.autoclear_features = 0; | |
228 | header.refcount_order = 4; | |
229 | header.header_length = 72; | |
230 | } else { | |
231 | be64_to_cpus(&header.incompatible_features); | |
232 | be64_to_cpus(&header.compatible_features); | |
233 | be64_to_cpus(&header.autoclear_features); | |
234 | be32_to_cpus(&header.refcount_order); | |
235 | be32_to_cpus(&header.header_length); | |
236 | } | |
237 | ||
238 | if (header.header_length > sizeof(header)) { | |
239 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
240 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
241 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
242 | s->unknown_header_fields_size); | |
243 | if (ret < 0) { | |
244 | goto fail; | |
245 | } | |
246 | } | |
247 | ||
248 | /* Handle feature bits */ | |
249 | s->incompatible_features = header.incompatible_features; | |
250 | s->compatible_features = header.compatible_features; | |
251 | s->autoclear_features = header.autoclear_features; | |
252 | ||
253 | if (s->incompatible_features != 0) { | |
254 | report_unsupported(bs, "incompatible features mask %" PRIx64, | |
255 | header.incompatible_features); | |
256 | ret = -ENOTSUP; | |
257 | goto fail; | |
258 | } | |
259 | ||
260 | if (!bs->read_only && s->autoclear_features != 0) { | |
261 | s->autoclear_features = 0; | |
262 | qcow2_update_header(bs); | |
263 | } | |
264 | ||
265 | /* Check support for various header values */ | |
266 | if (header.refcount_order != 4) { | |
267 | report_unsupported(bs, "%d bit reference counts", | |
268 | 1 << header.refcount_order); | |
e8cdcec1 KW |
269 | ret = -ENOTSUP; |
270 | goto fail; | |
271 | } | |
6744cbab | 272 | |
d191d12d | 273 | if (header.cluster_bits < MIN_CLUSTER_BITS || |
6d85a57e JS |
274 | header.cluster_bits > MAX_CLUSTER_BITS) { |
275 | ret = -EINVAL; | |
585f8587 | 276 | goto fail; |
6d85a57e JS |
277 | } |
278 | if (header.crypt_method > QCOW_CRYPT_AES) { | |
279 | ret = -EINVAL; | |
585f8587 | 280 | goto fail; |
6d85a57e | 281 | } |
585f8587 | 282 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 283 | if (s->crypt_method_header) { |
585f8587 | 284 | bs->encrypted = 1; |
6d85a57e | 285 | } |
585f8587 FB |
286 | s->cluster_bits = header.cluster_bits; |
287 | s->cluster_size = 1 << s->cluster_bits; | |
288 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
289 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ | |
290 | s->l2_size = 1 << s->l2_bits; | |
291 | bs->total_sectors = header.size / 512; | |
292 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
293 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
294 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
295 | s->refcount_table_offset = header.refcount_table_offset; | |
5fafdf24 | 296 | s->refcount_table_size = |
585f8587 FB |
297 | header.refcount_table_clusters << (s->cluster_bits - 3); |
298 | ||
299 | s->snapshots_offset = header.snapshots_offset; | |
300 | s->nb_snapshots = header.nb_snapshots; | |
301 | ||
302 | /* read the level 1 table */ | |
303 | s->l1_size = header.l1_size; | |
419b19d9 | 304 | s->l1_vm_state_index = size_to_l1(s, header.size); |
585f8587 FB |
305 | /* the L1 table must contain at least enough entries to put |
306 | header.size bytes */ | |
6d85a57e JS |
307 | if (s->l1_size < s->l1_vm_state_index) { |
308 | ret = -EINVAL; | |
585f8587 | 309 | goto fail; |
6d85a57e | 310 | } |
585f8587 | 311 | s->l1_table_offset = header.l1_table_offset; |
d191d12d | 312 | if (s->l1_size > 0) { |
7267c094 | 313 | s->l1_table = g_malloc0( |
d191d12d | 314 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
315 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
316 | s->l1_size * sizeof(uint64_t)); | |
317 | if (ret < 0) { | |
d191d12d | 318 | goto fail; |
6d85a57e | 319 | } |
d191d12d SW |
320 | for(i = 0;i < s->l1_size; i++) { |
321 | be64_to_cpus(&s->l1_table[i]); | |
322 | } | |
585f8587 | 323 | } |
29c1a730 KW |
324 | |
325 | /* alloc L2 table/refcount block cache */ | |
a6599793 | 326 | writethrough = ((flags & BDRV_O_CACHE_WB) == 0); |
29c1a730 KW |
327 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE, writethrough); |
328 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE, | |
329 | writethrough); | |
330 | ||
7267c094 | 331 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 332 | /* one more sector for decompressed data alignment */ |
dea43a65 | 333 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 334 | + 512); |
585f8587 | 335 | s->cluster_cache_offset = -1; |
06d9260f | 336 | s->flags = flags; |
3b46e624 | 337 | |
6d85a57e JS |
338 | ret = qcow2_refcount_init(bs); |
339 | if (ret != 0) { | |
585f8587 | 340 | goto fail; |
6d85a57e | 341 | } |
585f8587 | 342 | |
72cf2d4f | 343 | QLIST_INIT(&s->cluster_allocs); |
f214978a | 344 | |
9b80ddf3 | 345 | /* read qcow2 extensions */ |
6d85a57e | 346 | if (header.backing_file_offset) { |
9b80ddf3 | 347 | ext_end = header.backing_file_offset; |
6d85a57e | 348 | } else { |
9b80ddf3 | 349 | ext_end = s->cluster_size; |
6d85a57e | 350 | } |
6744cbab | 351 | if (qcow2_read_extensions(bs, header.header_length, ext_end)) { |
6d85a57e | 352 | ret = -EINVAL; |
9b80ddf3 | 353 | goto fail; |
6d85a57e | 354 | } |
9b80ddf3 | 355 | |
585f8587 FB |
356 | /* read the backing file name */ |
357 | if (header.backing_file_offset != 0) { | |
358 | len = header.backing_file_size; | |
6d85a57e | 359 | if (len > 1023) { |
585f8587 | 360 | len = 1023; |
6d85a57e JS |
361 | } |
362 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
363 | bs->backing_file, len); | |
364 | if (ret < 0) { | |
585f8587 | 365 | goto fail; |
6d85a57e | 366 | } |
585f8587 FB |
367 | bs->backing_file[len] = '\0'; |
368 | } | |
42deb29f KW |
369 | |
370 | ret = qcow2_read_snapshots(bs); | |
371 | if (ret < 0) { | |
585f8587 | 372 | goto fail; |
6d85a57e | 373 | } |
585f8587 | 374 | |
68d100e9 KW |
375 | /* Initialise locks */ |
376 | qemu_co_mutex_init(&s->lock); | |
377 | ||
585f8587 | 378 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
379 | { |
380 | BdrvCheckResult result = {0}; | |
381 | qcow2_check_refcounts(bs, &result); | |
382 | } | |
585f8587 | 383 | #endif |
6d85a57e | 384 | return ret; |
585f8587 FB |
385 | |
386 | fail: | |
6744cbab | 387 | g_free(s->unknown_header_fields); |
75bab85c | 388 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
389 | qcow2_free_snapshots(bs); |
390 | qcow2_refcount_close(bs); | |
7267c094 | 391 | g_free(s->l1_table); |
29c1a730 KW |
392 | if (s->l2_table_cache) { |
393 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
394 | } | |
7267c094 | 395 | g_free(s->cluster_cache); |
dea43a65 | 396 | qemu_vfree(s->cluster_data); |
6d85a57e | 397 | return ret; |
585f8587 FB |
398 | } |
399 | ||
7c80ab3f | 400 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
401 | { |
402 | BDRVQcowState *s = bs->opaque; | |
403 | uint8_t keybuf[16]; | |
404 | int len, i; | |
3b46e624 | 405 | |
585f8587 FB |
406 | memset(keybuf, 0, 16); |
407 | len = strlen(key); | |
408 | if (len > 16) | |
409 | len = 16; | |
410 | /* XXX: we could compress the chars to 7 bits to increase | |
411 | entropy */ | |
412 | for(i = 0;i < len;i++) { | |
413 | keybuf[i] = key[i]; | |
414 | } | |
415 | s->crypt_method = s->crypt_method_header; | |
416 | ||
417 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
418 | return -1; | |
419 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
420 | return -1; | |
421 | #if 0 | |
422 | /* test */ | |
423 | { | |
424 | uint8_t in[16]; | |
425 | uint8_t out[16]; | |
426 | uint8_t tmp[16]; | |
427 | for(i=0;i<16;i++) | |
428 | in[i] = i; | |
429 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
430 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
431 | for(i = 0; i < 16; i++) | |
432 | printf(" %02x", tmp[i]); | |
433 | printf("\n"); | |
434 | for(i = 0; i < 16; i++) | |
435 | printf(" %02x", out[i]); | |
436 | printf("\n"); | |
437 | } | |
438 | #endif | |
439 | return 0; | |
440 | } | |
441 | ||
f8a2e5e3 SH |
442 | static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs, |
443 | int64_t sector_num, int nb_sectors, int *pnum) | |
585f8587 | 444 | { |
f8a2e5e3 | 445 | BDRVQcowState *s = bs->opaque; |
585f8587 | 446 | uint64_t cluster_offset; |
1c46efaa | 447 | int ret; |
585f8587 | 448 | |
095a9c58 | 449 | *pnum = nb_sectors; |
f8a2e5e3 SH |
450 | /* FIXME We can get errors here, but the bdrv_co_is_allocated interface |
451 | * can't pass them on today */ | |
452 | qemu_co_mutex_lock(&s->lock); | |
1c46efaa | 453 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 454 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa KW |
455 | if (ret < 0) { |
456 | *pnum = 0; | |
457 | } | |
095a9c58 | 458 | |
585f8587 FB |
459 | return (cluster_offset != 0); |
460 | } | |
461 | ||
a9465922 | 462 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
463 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
464 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
465 | { |
466 | int n1; | |
467 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
468 | return nb_sectors; | |
469 | if (sector_num >= bs->total_sectors) | |
470 | n1 = 0; | |
471 | else | |
472 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 473 | |
e0d9c6f9 | 474 | qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); |
bd28f835 | 475 | |
a9465922 FB |
476 | return n1; |
477 | } | |
478 | ||
a968168c | 479 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 480 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 481 | { |
585f8587 | 482 | BDRVQcowState *s = bs->opaque; |
a9465922 | 483 | int index_in_cluster, n1; |
68d100e9 | 484 | int ret; |
faf575c1 | 485 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 486 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
487 | uint64_t bytes_done = 0; |
488 | QEMUIOVector hd_qiov; | |
489 | uint8_t *cluster_data = NULL; | |
585f8587 | 490 | |
3fc48d09 FZ |
491 | qemu_iovec_init(&hd_qiov, qiov->niov); |
492 | ||
493 | qemu_co_mutex_lock(&s->lock); | |
494 | ||
495 | while (remaining_sectors != 0) { | |
bd28f835 | 496 | |
5ebaa27e | 497 | /* prepare next request */ |
3fc48d09 | 498 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
499 | if (s->crypt_method) { |
500 | cur_nr_sectors = MIN(cur_nr_sectors, | |
501 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 502 | } |
5ebaa27e | 503 | |
3fc48d09 | 504 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 505 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 506 | if (ret < 0) { |
3fc48d09 | 507 | goto fail; |
8af36488 | 508 | } |
bd28f835 | 509 | |
3fc48d09 | 510 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 511 | |
3fc48d09 FZ |
512 | qemu_iovec_reset(&hd_qiov); |
513 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e FZ |
514 | cur_nr_sectors * 512); |
515 | ||
68d000a3 KW |
516 | switch (ret) { |
517 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
518 | |
519 | if (bs->backing_hd) { | |
520 | /* read from the base image */ | |
3fc48d09 FZ |
521 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
522 | sector_num, cur_nr_sectors); | |
5ebaa27e FZ |
523 | if (n1 > 0) { |
524 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
525 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 FZ |
526 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
527 | n1, &hd_qiov); | |
5ebaa27e FZ |
528 | qemu_co_mutex_lock(&s->lock); |
529 | if (ret < 0) { | |
3fc48d09 | 530 | goto fail; |
5ebaa27e FZ |
531 | } |
532 | } | |
533 | } else { | |
534 | /* Note: in this case, no need to wait */ | |
3fc48d09 | 535 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); |
5ebaa27e | 536 | } |
68d000a3 KW |
537 | break; |
538 | ||
539 | case QCOW2_CLUSTER_COMPRESSED: | |
5ebaa27e FZ |
540 | /* add AIO support for compressed blocks ? */ |
541 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
542 | if (ret < 0) { | |
3fc48d09 | 543 | goto fail; |
bd28f835 KW |
544 | } |
545 | ||
3fc48d09 | 546 | qemu_iovec_from_buffer(&hd_qiov, |
5ebaa27e | 547 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 548 | 512 * cur_nr_sectors); |
68d000a3 KW |
549 | break; |
550 | ||
551 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 552 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
553 | ret = -EIO; |
554 | goto fail; | |
5ebaa27e | 555 | } |
bd28f835 | 556 | |
5ebaa27e FZ |
557 | if (s->crypt_method) { |
558 | /* | |
559 | * For encrypted images, read everything into a temporary | |
560 | * contiguous buffer on which the AES functions can work. | |
561 | */ | |
3fc48d09 FZ |
562 | if (!cluster_data) { |
563 | cluster_data = | |
dea43a65 | 564 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
565 | } |
566 | ||
567 | assert(cur_nr_sectors <= | |
568 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
569 | qemu_iovec_reset(&hd_qiov); |
570 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
571 | 512 * cur_nr_sectors); |
572 | } | |
573 | ||
574 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
575 | qemu_co_mutex_unlock(&s->lock); | |
576 | ret = bdrv_co_readv(bs->file, | |
577 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 578 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
579 | qemu_co_mutex_lock(&s->lock); |
580 | if (ret < 0) { | |
3fc48d09 | 581 | goto fail; |
5ebaa27e FZ |
582 | } |
583 | if (s->crypt_method) { | |
3fc48d09 FZ |
584 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
585 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
586 | qemu_iovec_reset(&hd_qiov); | |
587 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 588 | cur_nr_sectors * 512); |
3fc48d09 | 589 | qemu_iovec_from_buffer(&hd_qiov, cluster_data, |
5ebaa27e FZ |
590 | 512 * cur_nr_sectors); |
591 | } | |
68d000a3 KW |
592 | break; |
593 | ||
594 | default: | |
595 | g_assert_not_reached(); | |
596 | ret = -EIO; | |
597 | goto fail; | |
faf575c1 | 598 | } |
f141eafe | 599 | |
3fc48d09 FZ |
600 | remaining_sectors -= cur_nr_sectors; |
601 | sector_num += cur_nr_sectors; | |
602 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 603 | } |
3fc48d09 | 604 | ret = 0; |
faf575c1 | 605 | |
3fc48d09 | 606 | fail: |
68d100e9 | 607 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 608 | |
3fc48d09 | 609 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 610 | qemu_vfree(cluster_data); |
68d100e9 KW |
611 | |
612 | return ret; | |
585f8587 FB |
613 | } |
614 | ||
68d100e9 | 615 | static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) |
f214978a | 616 | { |
f214978a KW |
617 | /* Take the request off the list of running requests */ |
618 | if (m->nb_clusters != 0) { | |
72cf2d4f | 619 | QLIST_REMOVE(m, next_in_flight); |
f214978a KW |
620 | } |
621 | ||
d4c146f0 | 622 | /* Restart all dependent requests */ |
68d100e9 KW |
623 | if (!qemu_co_queue_empty(&m->dependent_requests)) { |
624 | qemu_co_mutex_unlock(&s->lock); | |
e8ee5e4c | 625 | qemu_co_queue_restart_all(&m->dependent_requests); |
68d100e9 | 626 | qemu_co_mutex_lock(&s->lock); |
f214978a | 627 | } |
f214978a KW |
628 | } |
629 | ||
a968168c | 630 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
631 | int64_t sector_num, |
632 | int remaining_sectors, | |
633 | QEMUIOVector *qiov) | |
585f8587 | 634 | { |
585f8587 | 635 | BDRVQcowState *s = bs->opaque; |
585f8587 | 636 | int index_in_cluster; |
095a9c58 | 637 | int n_end; |
68d100e9 | 638 | int ret; |
faf575c1 | 639 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 640 | uint64_t cluster_offset; |
3fc48d09 FZ |
641 | QEMUIOVector hd_qiov; |
642 | uint64_t bytes_done = 0; | |
643 | uint8_t *cluster_data = NULL; | |
8e217d53 KW |
644 | QCowL2Meta l2meta = { |
645 | .nb_clusters = 0, | |
646 | }; | |
c2271403 | 647 | |
3cce16f4 KW |
648 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
649 | remaining_sectors); | |
650 | ||
c2271403 | 651 | qemu_co_queue_init(&l2meta.dependent_requests); |
585f8587 | 652 | |
3fc48d09 FZ |
653 | qemu_iovec_init(&hd_qiov, qiov->niov); |
654 | ||
655 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 656 | |
3fc48d09 FZ |
657 | qemu_co_mutex_lock(&s->lock); |
658 | ||
659 | while (remaining_sectors != 0) { | |
660 | ||
3cce16f4 | 661 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 FZ |
662 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
663 | n_end = index_in_cluster + remaining_sectors; | |
5ebaa27e FZ |
664 | if (s->crypt_method && |
665 | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { | |
666 | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; | |
667 | } | |
095a9c58 | 668 | |
3fc48d09 | 669 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
5ebaa27e FZ |
670 | index_in_cluster, n_end, &cur_nr_sectors, &l2meta); |
671 | if (ret < 0) { | |
3fc48d09 | 672 | goto fail; |
5ebaa27e | 673 | } |
148da7ea | 674 | |
5ebaa27e FZ |
675 | cluster_offset = l2meta.cluster_offset; |
676 | assert((cluster_offset & 511) == 0); | |
148da7ea | 677 | |
3fc48d09 FZ |
678 | qemu_iovec_reset(&hd_qiov); |
679 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 680 | cur_nr_sectors * 512); |
6f5f060b | 681 | |
5ebaa27e | 682 | if (s->crypt_method) { |
3fc48d09 | 683 | if (!cluster_data) { |
dea43a65 | 684 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
685 | s->cluster_size); |
686 | } | |
6f5f060b | 687 | |
3fc48d09 | 688 | assert(hd_qiov.size <= |
5ebaa27e | 689 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
3fc48d09 | 690 | qemu_iovec_to_buffer(&hd_qiov, cluster_data); |
6f5f060b | 691 | |
3fc48d09 FZ |
692 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
693 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 694 | |
3fc48d09 FZ |
695 | qemu_iovec_reset(&hd_qiov); |
696 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
697 | cur_nr_sectors * 512); |
698 | } | |
6f5f060b | 699 | |
5ebaa27e FZ |
700 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
701 | qemu_co_mutex_unlock(&s->lock); | |
3cce16f4 KW |
702 | trace_qcow2_writev_data(qemu_coroutine_self(), |
703 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
704 | ret = bdrv_co_writev(bs->file, |
705 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 706 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
707 | qemu_co_mutex_lock(&s->lock); |
708 | if (ret < 0) { | |
3fc48d09 | 709 | goto fail; |
5ebaa27e | 710 | } |
f141eafe | 711 | |
5ebaa27e | 712 | ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); |
5ebaa27e | 713 | if (ret < 0) { |
3fc48d09 | 714 | goto fail; |
5ebaa27e | 715 | } |
faf575c1 | 716 | |
0fa9131a KW |
717 | run_dependent_requests(s, &l2meta); |
718 | ||
3fc48d09 FZ |
719 | remaining_sectors -= cur_nr_sectors; |
720 | sector_num += cur_nr_sectors; | |
721 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 722 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 723 | } |
3fc48d09 | 724 | ret = 0; |
faf575c1 | 725 | |
3fc48d09 | 726 | fail: |
0fa9131a KW |
727 | run_dependent_requests(s, &l2meta); |
728 | ||
68d100e9 | 729 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 730 | |
3fc48d09 | 731 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 732 | qemu_vfree(cluster_data); |
3cce16f4 | 733 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 734 | |
68d100e9 | 735 | return ret; |
585f8587 FB |
736 | } |
737 | ||
7c80ab3f | 738 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
739 | { |
740 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 741 | g_free(s->l1_table); |
29c1a730 KW |
742 | |
743 | qcow2_cache_flush(bs, s->l2_table_cache); | |
744 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
745 | ||
746 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
747 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
748 | ||
6744cbab | 749 | g_free(s->unknown_header_fields); |
75bab85c | 750 | cleanup_unknown_header_ext(bs); |
6744cbab | 751 | |
7267c094 | 752 | g_free(s->cluster_cache); |
dea43a65 | 753 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 754 | qcow2_refcount_close(bs); |
28c1202b | 755 | qcow2_free_snapshots(bs); |
585f8587 FB |
756 | } |
757 | ||
06d9260f AL |
758 | static void qcow2_invalidate_cache(BlockDriverState *bs) |
759 | { | |
760 | BDRVQcowState *s = bs->opaque; | |
761 | int flags = s->flags; | |
762 | AES_KEY aes_encrypt_key; | |
763 | AES_KEY aes_decrypt_key; | |
764 | uint32_t crypt_method = 0; | |
765 | ||
766 | /* | |
767 | * Backing files are read-only which makes all of their metadata immutable, | |
768 | * that means we don't have to worry about reopening them here. | |
769 | */ | |
770 | ||
771 | if (s->crypt_method) { | |
772 | crypt_method = s->crypt_method; | |
773 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
774 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
775 | } | |
776 | ||
777 | qcow2_close(bs); | |
778 | ||
779 | memset(s, 0, sizeof(BDRVQcowState)); | |
780 | qcow2_open(bs, flags); | |
781 | ||
782 | if (crypt_method) { | |
783 | s->crypt_method = crypt_method; | |
784 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
785 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
786 | } | |
787 | } | |
788 | ||
e24e49e6 KW |
789 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
790 | size_t len, size_t buflen) | |
791 | { | |
792 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
793 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
794 | ||
795 | if (buflen < ext_len) { | |
796 | return -ENOSPC; | |
797 | } | |
798 | ||
799 | *ext_backing_fmt = (QCowExtension) { | |
800 | .magic = cpu_to_be32(magic), | |
801 | .len = cpu_to_be32(len), | |
802 | }; | |
803 | memcpy(buf + sizeof(QCowExtension), s, len); | |
804 | ||
805 | return ext_len; | |
806 | } | |
807 | ||
756e6736 | 808 | /* |
e24e49e6 KW |
809 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
810 | * the backing file name and all extensions. qcow2 was not designed to allow | |
811 | * such changes, so if we run out of space (we can only use the first cluster) | |
812 | * this function may fail. | |
756e6736 KW |
813 | * |
814 | * Returns 0 on success, -errno in error cases. | |
815 | */ | |
e24e49e6 | 816 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 817 | { |
756e6736 | 818 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
819 | QCowHeader *header; |
820 | char *buf; | |
821 | size_t buflen = s->cluster_size; | |
756e6736 | 822 | int ret; |
e24e49e6 KW |
823 | uint64_t total_size; |
824 | uint32_t refcount_table_clusters; | |
6744cbab | 825 | size_t header_length; |
75bab85c | 826 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 827 | |
e24e49e6 | 828 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 829 | |
e24e49e6 KW |
830 | /* Header structure */ |
831 | header = (QCowHeader*) buf; | |
756e6736 | 832 | |
e24e49e6 KW |
833 | if (buflen < sizeof(*header)) { |
834 | ret = -ENOSPC; | |
835 | goto fail; | |
756e6736 KW |
836 | } |
837 | ||
6744cbab | 838 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
839 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
840 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
841 | ||
842 | *header = (QCowHeader) { | |
6744cbab | 843 | /* Version 2 fields */ |
e24e49e6 | 844 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 845 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
846 | .backing_file_offset = 0, |
847 | .backing_file_size = 0, | |
848 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
849 | .size = cpu_to_be64(total_size), | |
850 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
851 | .l1_size = cpu_to_be32(s->l1_size), | |
852 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
853 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
854 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
855 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
856 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
857 | |
858 | /* Version 3 fields */ | |
859 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
860 | .compatible_features = cpu_to_be64(s->compatible_features), | |
861 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
862 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
863 | .header_length = cpu_to_be32(header_length), | |
e24e49e6 | 864 | }; |
756e6736 | 865 | |
6744cbab KW |
866 | /* For older versions, write a shorter header */ |
867 | switch (s->qcow_version) { | |
868 | case 2: | |
869 | ret = offsetof(QCowHeader, incompatible_features); | |
870 | break; | |
871 | case 3: | |
872 | ret = sizeof(*header); | |
873 | break; | |
874 | default: | |
875 | return -EINVAL; | |
876 | } | |
877 | ||
878 | buf += ret; | |
879 | buflen -= ret; | |
880 | memset(buf, 0, buflen); | |
881 | ||
882 | /* Preserve any unknown field in the header */ | |
883 | if (s->unknown_header_fields_size) { | |
884 | if (buflen < s->unknown_header_fields_size) { | |
885 | ret = -ENOSPC; | |
886 | goto fail; | |
887 | } | |
888 | ||
889 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
890 | buf += s->unknown_header_fields_size; | |
891 | buflen -= s->unknown_header_fields_size; | |
892 | } | |
756e6736 | 893 | |
e24e49e6 KW |
894 | /* Backing file format header extension */ |
895 | if (*bs->backing_format) { | |
896 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
897 | bs->backing_format, strlen(bs->backing_format), | |
898 | buflen); | |
899 | if (ret < 0) { | |
900 | goto fail; | |
756e6736 KW |
901 | } |
902 | ||
e24e49e6 KW |
903 | buf += ret; |
904 | buflen -= ret; | |
756e6736 KW |
905 | } |
906 | ||
75bab85c KW |
907 | /* Keep unknown header extensions */ |
908 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
909 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
910 | if (ret < 0) { | |
911 | goto fail; | |
912 | } | |
913 | ||
914 | buf += ret; | |
915 | buflen -= ret; | |
916 | } | |
917 | ||
e24e49e6 KW |
918 | /* End of header extensions */ |
919 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
920 | if (ret < 0) { |
921 | goto fail; | |
922 | } | |
923 | ||
e24e49e6 KW |
924 | buf += ret; |
925 | buflen -= ret; | |
756e6736 | 926 | |
e24e49e6 KW |
927 | /* Backing file name */ |
928 | if (*bs->backing_file) { | |
929 | size_t backing_file_len = strlen(bs->backing_file); | |
930 | ||
931 | if (buflen < backing_file_len) { | |
932 | ret = -ENOSPC; | |
933 | goto fail; | |
934 | } | |
935 | ||
936 | strncpy(buf, bs->backing_file, buflen); | |
937 | ||
938 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
939 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
940 | } |
941 | ||
e24e49e6 KW |
942 | /* Write the new header */ |
943 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
944 | if (ret < 0) { |
945 | goto fail; | |
946 | } | |
947 | ||
948 | ret = 0; | |
949 | fail: | |
e24e49e6 | 950 | qemu_vfree(header); |
756e6736 KW |
951 | return ret; |
952 | } | |
953 | ||
954 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
955 | const char *backing_file, const char *backing_fmt) | |
956 | { | |
e24e49e6 KW |
957 | /* Backing file format doesn't make sense without a backing file */ |
958 | if (backing_fmt && !backing_file) { | |
959 | return -EINVAL; | |
960 | } | |
961 | ||
962 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
963 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
964 | ||
965 | return qcow2_update_header(bs); | |
756e6736 KW |
966 | } |
967 | ||
a35e1c17 KW |
968 | static int preallocate(BlockDriverState *bs) |
969 | { | |
a35e1c17 KW |
970 | uint64_t nb_sectors; |
971 | uint64_t offset; | |
972 | int num; | |
148da7ea | 973 | int ret; |
a35e1c17 KW |
974 | QCowL2Meta meta; |
975 | ||
976 | nb_sectors = bdrv_getlength(bs) >> 9; | |
977 | offset = 0; | |
68d100e9 | 978 | qemu_co_queue_init(&meta.dependent_requests); |
148da7ea | 979 | meta.cluster_offset = 0; |
a35e1c17 KW |
980 | |
981 | while (nb_sectors) { | |
982 | num = MIN(nb_sectors, INT_MAX >> 9); | |
148da7ea | 983 | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta); |
148da7ea | 984 | if (ret < 0) { |
19dbcbf7 | 985 | return ret; |
a35e1c17 KW |
986 | } |
987 | ||
19dbcbf7 KW |
988 | ret = qcow2_alloc_cluster_link_l2(bs, &meta); |
989 | if (ret < 0) { | |
148da7ea | 990 | qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); |
19dbcbf7 | 991 | return ret; |
a35e1c17 KW |
992 | } |
993 | ||
f214978a KW |
994 | /* There are no dependent requests, but we need to remove our request |
995 | * from the list of in-flight requests */ | |
68d100e9 | 996 | run_dependent_requests(bs->opaque, &meta); |
f214978a | 997 | |
a35e1c17 KW |
998 | /* TODO Preallocate data if requested */ |
999 | ||
1000 | nb_sectors -= num; | |
1001 | offset += num << 9; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * It is expected that the image file is large enough to actually contain | |
1006 | * all of the allocated clusters (otherwise we get failing reads after | |
1007 | * EOF). Extend the image to the last allocated sector. | |
1008 | */ | |
148da7ea | 1009 | if (meta.cluster_offset != 0) { |
ea80b906 KW |
1010 | uint8_t buf[512]; |
1011 | memset(buf, 0, 512); | |
19dbcbf7 KW |
1012 | ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); |
1013 | if (ret < 0) { | |
1014 | return ret; | |
1015 | } | |
a35e1c17 KW |
1016 | } |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
7c80ab3f JS |
1021 | static int qcow2_create2(const char *filename, int64_t total_size, |
1022 | const char *backing_file, const char *backing_format, | |
1023 | int flags, size_t cluster_size, int prealloc, | |
6744cbab | 1024 | QEMUOptionParameter *options, int version) |
a9420734 | 1025 | { |
9b2260cb | 1026 | /* Calculate cluster_bits */ |
a9420734 KW |
1027 | int cluster_bits; |
1028 | cluster_bits = ffs(cluster_size) - 1; | |
1029 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1030 | (1 << cluster_bits) != cluster_size) | |
1031 | { | |
1032 | error_report( | |
6daf194d | 1033 | "Cluster size must be a power of two between %d and %dk", |
a9420734 KW |
1034 | 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
1035 | return -EINVAL; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Open the image file and write a minimal qcow2 header. | |
1040 | * | |
1041 | * We keep things simple and start with a zero-sized image. We also | |
1042 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1043 | * inconsistency later. | |
1044 | * | |
1045 | * We do need a refcount table because growing the refcount table means | |
1046 | * allocating two new refcount blocks - the seconds of which would be at | |
1047 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1048 | * size for any qcow2 image. | |
1049 | */ | |
1050 | BlockDriverState* bs; | |
1051 | QCowHeader header; | |
1052 | uint8_t* refcount_table; | |
1053 | int ret; | |
1054 | ||
1055 | ret = bdrv_create_file(filename, options); | |
1056 | if (ret < 0) { | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); | |
1061 | if (ret < 0) { | |
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | /* Write the header */ | |
1066 | memset(&header, 0, sizeof(header)); | |
1067 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
6744cbab | 1068 | header.version = cpu_to_be32(version); |
a9420734 KW |
1069 | header.cluster_bits = cpu_to_be32(cluster_bits); |
1070 | header.size = cpu_to_be64(0); | |
1071 | header.l1_table_offset = cpu_to_be64(0); | |
1072 | header.l1_size = cpu_to_be32(0); | |
1073 | header.refcount_table_offset = cpu_to_be64(cluster_size); | |
1074 | header.refcount_table_clusters = cpu_to_be32(1); | |
6744cbab KW |
1075 | header.refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT); |
1076 | header.header_length = cpu_to_be32(sizeof(header)); | |
a9420734 KW |
1077 | |
1078 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
1079 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); | |
1080 | } else { | |
1081 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
1082 | } | |
1083 | ||
1084 | ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); | |
1085 | if (ret < 0) { | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | /* Write an empty refcount table */ | |
7267c094 | 1090 | refcount_table = g_malloc0(cluster_size); |
a9420734 | 1091 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
7267c094 | 1092 | g_free(refcount_table); |
a9420734 KW |
1093 | |
1094 | if (ret < 0) { | |
1095 | goto out; | |
1096 | } | |
1097 | ||
1098 | bdrv_close(bs); | |
1099 | ||
1100 | /* | |
1101 | * And now open the image and make it consistent first (i.e. increase the | |
1102 | * refcount of the cluster that is occupied by the header and the refcount | |
1103 | * table) | |
1104 | */ | |
1105 | BlockDriver* drv = bdrv_find_format("qcow2"); | |
1106 | assert(drv != NULL); | |
e1a7107f KW |
1107 | ret = bdrv_open(bs, filename, |
1108 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); | |
a9420734 KW |
1109 | if (ret < 0) { |
1110 | goto out; | |
1111 | } | |
1112 | ||
1113 | ret = qcow2_alloc_clusters(bs, 2 * cluster_size); | |
1114 | if (ret < 0) { | |
1115 | goto out; | |
1116 | ||
1117 | } else if (ret != 0) { | |
1118 | error_report("Huh, first cluster in empty image is already in use?"); | |
1119 | abort(); | |
1120 | } | |
1121 | ||
1122 | /* Okay, now that we have a valid image, let's give it the right size */ | |
1123 | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); | |
1124 | if (ret < 0) { | |
1125 | goto out; | |
1126 | } | |
1127 | ||
1128 | /* Want a backing file? There you go.*/ | |
1129 | if (backing_file) { | |
1130 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1131 | if (ret < 0) { | |
1132 | goto out; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* And if we're supposed to preallocate metadata, do that now */ | |
1137 | if (prealloc) { | |
1138 | ret = preallocate(bs); | |
1139 | if (ret < 0) { | |
1140 | goto out; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | ret = 0; | |
1145 | out: | |
1146 | bdrv_delete(bs); | |
1147 | return ret; | |
1148 | } | |
de5f3f40 | 1149 | |
7c80ab3f | 1150 | static int qcow2_create(const char *filename, QEMUOptionParameter *options) |
de5f3f40 KW |
1151 | { |
1152 | const char *backing_file = NULL; | |
1153 | const char *backing_fmt = NULL; | |
1154 | uint64_t sectors = 0; | |
1155 | int flags = 0; | |
99cce9fa | 1156 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1157 | int prealloc = 0; |
6744cbab | 1158 | int version = 2; |
de5f3f40 KW |
1159 | |
1160 | /* Read out options */ | |
1161 | while (options && options->name) { | |
1162 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1163 | sectors = options->value.n / 512; | |
1164 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1165 | backing_file = options->value.s; | |
1166 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
1167 | backing_fmt = options->value.s; | |
1168 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
1169 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
1170 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { | |
1171 | if (options->value.n) { | |
1172 | cluster_size = options->value.n; | |
1173 | } | |
1174 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { | |
1175 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
1176 | prealloc = 0; | |
1177 | } else if (!strcmp(options->value.s, "metadata")) { | |
1178 | prealloc = 1; | |
1179 | } else { | |
1180 | fprintf(stderr, "Invalid preallocation mode: '%s'\n", | |
1181 | options->value.s); | |
1182 | return -EINVAL; | |
1183 | } | |
6744cbab KW |
1184 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
1185 | if (!options->value.s || !strcmp(options->value.s, "0.10")) { | |
1186 | version = 2; | |
1187 | } else if (!strcmp(options->value.s, "1.1")) { | |
1188 | version = 3; | |
1189 | } else { | |
1190 | fprintf(stderr, "Invalid compatibility level: '%s'\n", | |
1191 | options->value.s); | |
1192 | return -EINVAL; | |
1193 | } | |
de5f3f40 KW |
1194 | } |
1195 | options++; | |
1196 | } | |
1197 | ||
1198 | if (backing_file && prealloc) { | |
1199 | fprintf(stderr, "Backing file and preallocation cannot be used at " | |
1200 | "the same time\n"); | |
1201 | return -EINVAL; | |
1202 | } | |
1203 | ||
7c80ab3f | 1204 | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
6744cbab | 1205 | cluster_size, prealloc, options, version); |
de5f3f40 KW |
1206 | } |
1207 | ||
7c80ab3f | 1208 | static int qcow2_make_empty(BlockDriverState *bs) |
20d97356 BS |
1209 | { |
1210 | #if 0 | |
1211 | /* XXX: not correct */ | |
1212 | BDRVQcowState *s = bs->opaque; | |
1213 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
1214 | int ret; | |
1215 | ||
1216 | memset(s->l1_table, 0, l1_length); | |
66f82cee | 1217 | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) |
20d97356 | 1218 | return -1; |
66f82cee | 1219 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
20d97356 BS |
1220 | if (ret < 0) |
1221 | return ret; | |
1222 | ||
1223 | l2_cache_reset(bs); | |
1224 | #endif | |
1225 | return 0; | |
1226 | } | |
1227 | ||
6db39ae2 PB |
1228 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1229 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1230 | { |
6db39ae2 PB |
1231 | int ret; |
1232 | BDRVQcowState *s = bs->opaque; | |
1233 | ||
1234 | qemu_co_mutex_lock(&s->lock); | |
1235 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
5ea929e3 | 1236 | nb_sectors); |
6db39ae2 PB |
1237 | qemu_co_mutex_unlock(&s->lock); |
1238 | return ret; | |
5ea929e3 KW |
1239 | } |
1240 | ||
419b19d9 SH |
1241 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1242 | { | |
1243 | BDRVQcowState *s = bs->opaque; | |
1244 | int ret, new_l1_size; | |
1245 | ||
1246 | if (offset & 511) { | |
259b2173 | 1247 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1248 | return -EINVAL; |
1249 | } | |
1250 | ||
1251 | /* cannot proceed if image has snapshots */ | |
1252 | if (s->nb_snapshots) { | |
259b2173 | 1253 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1254 | return -ENOTSUP; |
1255 | } | |
1256 | ||
1257 | /* shrinking is currently not supported */ | |
1258 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1259 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1260 | return -ENOTSUP; |
1261 | } | |
1262 | ||
1263 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1264 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1265 | if (ret < 0) { |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | /* write updated header.size */ | |
1270 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1271 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1272 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1273 | if (ret < 0) { |
1274 | return ret; | |
1275 | } | |
1276 | ||
1277 | s->l1_vm_state_index = new_l1_size; | |
1278 | return 0; | |
1279 | } | |
1280 | ||
20d97356 BS |
1281 | /* XXX: put compressed sectors first, then all the cluster aligned |
1282 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1283 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1284 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1285 | { |
1286 | BDRVQcowState *s = bs->opaque; | |
1287 | z_stream strm; | |
1288 | int ret, out_len; | |
1289 | uint8_t *out_buf; | |
1290 | uint64_t cluster_offset; | |
1291 | ||
1292 | if (nb_sectors == 0) { | |
1293 | /* align end of file to a sector boundary to ease reading with | |
1294 | sector based I/Os */ | |
66f82cee | 1295 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1296 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1297 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1298 | return 0; |
1299 | } | |
1300 | ||
1301 | if (nb_sectors != s->cluster_sectors) | |
1302 | return -EINVAL; | |
1303 | ||
7267c094 | 1304 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1305 | |
1306 | /* best compression, small window, no zlib header */ | |
1307 | memset(&strm, 0, sizeof(strm)); | |
1308 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1309 | Z_DEFLATED, -12, | |
1310 | 9, Z_DEFAULT_STRATEGY); | |
1311 | if (ret != 0) { | |
8f1efd00 KW |
1312 | ret = -EINVAL; |
1313 | goto fail; | |
20d97356 BS |
1314 | } |
1315 | ||
1316 | strm.avail_in = s->cluster_size; | |
1317 | strm.next_in = (uint8_t *)buf; | |
1318 | strm.avail_out = s->cluster_size; | |
1319 | strm.next_out = out_buf; | |
1320 | ||
1321 | ret = deflate(&strm, Z_FINISH); | |
1322 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1323 | deflateEnd(&strm); |
8f1efd00 KW |
1324 | ret = -EINVAL; |
1325 | goto fail; | |
20d97356 BS |
1326 | } |
1327 | out_len = strm.next_out - out_buf; | |
1328 | ||
1329 | deflateEnd(&strm); | |
1330 | ||
1331 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1332 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
1333 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1334 | if (ret < 0) { | |
1335 | goto fail; | |
1336 | } | |
20d97356 BS |
1337 | } else { |
1338 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
1339 | sector_num << 9, out_len); | |
8f1efd00 KW |
1340 | if (!cluster_offset) { |
1341 | ret = -EIO; | |
1342 | goto fail; | |
1343 | } | |
20d97356 | 1344 | cluster_offset &= s->cluster_offset_mask; |
66f82cee | 1345 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
1346 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1347 | if (ret < 0) { | |
1348 | goto fail; | |
20d97356 BS |
1349 | } |
1350 | } | |
1351 | ||
8f1efd00 KW |
1352 | ret = 0; |
1353 | fail: | |
7267c094 | 1354 | g_free(out_buf); |
8f1efd00 | 1355 | return ret; |
20d97356 BS |
1356 | } |
1357 | ||
a968168c | 1358 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 1359 | { |
29c1a730 KW |
1360 | BDRVQcowState *s = bs->opaque; |
1361 | int ret; | |
1362 | ||
8b94ff85 | 1363 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
1364 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1365 | if (ret < 0) { | |
c95de7e2 | 1366 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1367 | return ret; |
29c1a730 KW |
1368 | } |
1369 | ||
1370 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1371 | if (ret < 0) { | |
c95de7e2 | 1372 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1373 | return ret; |
29c1a730 | 1374 | } |
8b94ff85 | 1375 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 1376 | |
eb489bb1 KW |
1377 | return 0; |
1378 | } | |
1379 | ||
7c80ab3f | 1380 | static int64_t qcow2_vm_state_offset(BDRVQcowState *s) |
20d97356 BS |
1381 | { |
1382 | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); | |
1383 | } | |
1384 | ||
7c80ab3f | 1385 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
1386 | { |
1387 | BDRVQcowState *s = bs->opaque; | |
1388 | bdi->cluster_size = s->cluster_size; | |
7c80ab3f | 1389 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
1390 | return 0; |
1391 | } | |
1392 | ||
1393 | ||
7c80ab3f | 1394 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result) |
20d97356 | 1395 | { |
9ac228e0 | 1396 | return qcow2_check_refcounts(bs, result); |
20d97356 BS |
1397 | } |
1398 | ||
1399 | #if 0 | |
1400 | static void dump_refcounts(BlockDriverState *bs) | |
1401 | { | |
1402 | BDRVQcowState *s = bs->opaque; | |
1403 | int64_t nb_clusters, k, k1, size; | |
1404 | int refcount; | |
1405 | ||
66f82cee | 1406 | size = bdrv_getlength(bs->file); |
20d97356 BS |
1407 | nb_clusters = size_to_clusters(s, size); |
1408 | for(k = 0; k < nb_clusters;) { | |
1409 | k1 = k; | |
1410 | refcount = get_refcount(bs, k); | |
1411 | k++; | |
1412 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
1413 | k++; | |
0bfcd599 BS |
1414 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
1415 | k - k1); | |
20d97356 BS |
1416 | } |
1417 | } | |
1418 | #endif | |
1419 | ||
7c80ab3f JS |
1420 | static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1421 | int64_t pos, int size) | |
20d97356 BS |
1422 | { |
1423 | BDRVQcowState *s = bs->opaque; | |
1424 | int growable = bs->growable; | |
1425 | int ret; | |
1426 | ||
66f82cee | 1427 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 1428 | bs->growable = 1; |
7c80ab3f | 1429 | ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1430 | bs->growable = growable; |
1431 | ||
1432 | return ret; | |
1433 | } | |
1434 | ||
7c80ab3f JS |
1435 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1436 | int64_t pos, int size) | |
20d97356 BS |
1437 | { |
1438 | BDRVQcowState *s = bs->opaque; | |
1439 | int growable = bs->growable; | |
1440 | int ret; | |
1441 | ||
66f82cee | 1442 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 1443 | bs->growable = 1; |
7c80ab3f | 1444 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1445 | bs->growable = growable; |
1446 | ||
1447 | return ret; | |
1448 | } | |
1449 | ||
7c80ab3f | 1450 | static QEMUOptionParameter qcow2_create_options[] = { |
20d97356 BS |
1451 | { |
1452 | .name = BLOCK_OPT_SIZE, | |
1453 | .type = OPT_SIZE, | |
1454 | .help = "Virtual disk size" | |
1455 | }, | |
6744cbab KW |
1456 | { |
1457 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
1458 | .type = OPT_STRING, | |
1459 | .help = "Compatibility level (0.10 or 1.1)" | |
1460 | }, | |
20d97356 BS |
1461 | { |
1462 | .name = BLOCK_OPT_BACKING_FILE, | |
1463 | .type = OPT_STRING, | |
1464 | .help = "File name of a base image" | |
1465 | }, | |
1466 | { | |
1467 | .name = BLOCK_OPT_BACKING_FMT, | |
1468 | .type = OPT_STRING, | |
1469 | .help = "Image format of the base image" | |
1470 | }, | |
1471 | { | |
1472 | .name = BLOCK_OPT_ENCRYPT, | |
1473 | .type = OPT_FLAG, | |
1474 | .help = "Encrypt the image" | |
1475 | }, | |
1476 | { | |
1477 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
1478 | .type = OPT_SIZE, | |
99cce9fa KW |
1479 | .help = "qcow2 cluster size", |
1480 | .value = { .n = DEFAULT_CLUSTER_SIZE }, | |
20d97356 BS |
1481 | }, |
1482 | { | |
1483 | .name = BLOCK_OPT_PREALLOC, | |
1484 | .type = OPT_STRING, | |
1485 | .help = "Preallocation mode (allowed values: off, metadata)" | |
1486 | }, | |
1487 | { NULL } | |
1488 | }; | |
1489 | ||
1490 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
1491 | .format_name = "qcow2", |
1492 | .instance_size = sizeof(BDRVQcowState), | |
1493 | .bdrv_probe = qcow2_probe, | |
1494 | .bdrv_open = qcow2_open, | |
1495 | .bdrv_close = qcow2_close, | |
1496 | .bdrv_create = qcow2_create, | |
f8a2e5e3 | 1497 | .bdrv_co_is_allocated = qcow2_co_is_allocated, |
7c80ab3f JS |
1498 | .bdrv_set_key = qcow2_set_key, |
1499 | .bdrv_make_empty = qcow2_make_empty, | |
1500 | ||
c68b89ac KW |
1501 | .bdrv_co_readv = qcow2_co_readv, |
1502 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 1503 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 1504 | |
6db39ae2 | 1505 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 1506 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 1507 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
1508 | |
1509 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
1510 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
1511 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
1512 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
51ef6727 | 1513 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
7c80ab3f | 1514 | .bdrv_get_info = qcow2_get_info, |
20d97356 | 1515 | |
7c80ab3f JS |
1516 | .bdrv_save_vmstate = qcow2_save_vmstate, |
1517 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 BS |
1518 | |
1519 | .bdrv_change_backing_file = qcow2_change_backing_file, | |
1520 | ||
06d9260f AL |
1521 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
1522 | ||
7c80ab3f JS |
1523 | .create_options = qcow2_create_options, |
1524 | .bdrv_check = qcow2_check, | |
20d97356 BS |
1525 | }; |
1526 | ||
5efa9d5a AL |
1527 | static void bdrv_qcow2_init(void) |
1528 | { | |
1529 | bdrv_register(&bdrv_qcow2); | |
1530 | } | |
1531 | ||
1532 | block_init(bdrv_qcow2_init); |