]>
Commit | Line | Data |
---|---|---|
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 | |
cfcc4c62 | 57 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
9b80ddf3 | 58 | |
7c80ab3f | 59 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
60 | { |
61 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 62 | |
585f8587 FB |
63 | if (buf_size >= sizeof(QCowHeader) && |
64 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 65 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
66 | return 100; |
67 | else | |
68 | return 0; | |
69 | } | |
70 | ||
9b80ddf3 AL |
71 | |
72 | /* | |
73 | * read qcow2 extension and fill bs | |
74 | * start reading from start_offset | |
75 | * finish reading upon magic of value 0 or when end_offset reached | |
76 | * unknown magic is skipped (future extension this version knows nothing about) | |
77 | * return 0 upon success, non-0 otherwise | |
78 | */ | |
7c80ab3f | 79 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
cfcc4c62 | 80 | uint64_t end_offset, void **p_feature_table) |
9b80ddf3 | 81 | { |
75bab85c | 82 | BDRVQcowState *s = bs->opaque; |
9b80ddf3 AL |
83 | QCowExtension ext; |
84 | uint64_t offset; | |
75bab85c | 85 | int ret; |
9b80ddf3 AL |
86 | |
87 | #ifdef DEBUG_EXT | |
7c80ab3f | 88 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
89 | #endif |
90 | offset = start_offset; | |
91 | while (offset < end_offset) { | |
92 | ||
93 | #ifdef DEBUG_EXT | |
94 | /* Sanity check */ | |
95 | if (offset > s->cluster_size) | |
7c80ab3f | 96 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 97 | |
9b2260cb | 98 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
99 | #endif |
100 | ||
66f82cee | 101 | if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
7c80ab3f | 102 | fprintf(stderr, "qcow2_read_extension: ERROR: " |
0bfcd599 BS |
103 | "pread fail from offset %" PRIu64 "\n", |
104 | offset); | |
9b80ddf3 AL |
105 | return 1; |
106 | } | |
107 | be32_to_cpus(&ext.magic); | |
108 | be32_to_cpus(&ext.len); | |
109 | offset += sizeof(ext); | |
110 | #ifdef DEBUG_EXT | |
111 | printf("ext.magic = 0x%x\n", ext.magic); | |
112 | #endif | |
64ca6aee KW |
113 | if (ext.len > end_offset - offset) { |
114 | error_report("Header extension too large"); | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
9b80ddf3 | 118 | switch (ext.magic) { |
7c80ab3f | 119 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 120 | return 0; |
f965509c | 121 | |
7c80ab3f | 122 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c AL |
123 | if (ext.len >= sizeof(bs->backing_format)) { |
124 | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large" | |
4c978075 | 125 | " (>=%zu)\n", |
f965509c AL |
126 | ext.len, sizeof(bs->backing_format)); |
127 | return 2; | |
128 | } | |
66f82cee | 129 | if (bdrv_pread(bs->file, offset , bs->backing_format, |
f965509c AL |
130 | ext.len) != ext.len) |
131 | return 3; | |
132 | bs->backing_format[ext.len] = '\0'; | |
133 | #ifdef DEBUG_EXT | |
134 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
135 | #endif | |
f965509c AL |
136 | break; |
137 | ||
cfcc4c62 KW |
138 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
139 | if (p_feature_table != NULL) { | |
140 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
141 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); | |
142 | if (ret < 0) { | |
143 | return ret; | |
144 | } | |
145 | ||
146 | *p_feature_table = feature_table; | |
147 | } | |
148 | break; | |
149 | ||
9b80ddf3 | 150 | default: |
75bab85c KW |
151 | /* unknown magic - save it in case we need to rewrite the header */ |
152 | { | |
153 | Qcow2UnknownHeaderExtension *uext; | |
154 | ||
155 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
156 | uext->magic = ext.magic; | |
157 | uext->len = ext.len; | |
158 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
159 | ||
160 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); | |
161 | if (ret < 0) { | |
162 | return ret; | |
163 | } | |
75bab85c | 164 | } |
9b80ddf3 AL |
165 | break; |
166 | } | |
fd29b4bb KW |
167 | |
168 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
169 | } |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
75bab85c KW |
174 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
175 | { | |
176 | BDRVQcowState *s = bs->opaque; | |
177 | Qcow2UnknownHeaderExtension *uext, *next; | |
178 | ||
179 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
180 | QLIST_REMOVE(uext, next); | |
181 | g_free(uext); | |
182 | } | |
183 | } | |
9b80ddf3 | 184 | |
b9531b6e SW |
185 | static void GCC_FMT_ATTR(2, 3) report_unsupported(BlockDriverState *bs, |
186 | const char *fmt, ...) | |
6744cbab KW |
187 | { |
188 | char msg[64]; | |
189 | va_list ap; | |
190 | ||
191 | va_start(ap, fmt); | |
192 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
193 | va_end(ap); | |
194 | ||
195 | qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, | |
196 | bs->device_name, "qcow2", msg); | |
197 | } | |
198 | ||
cfcc4c62 KW |
199 | static void report_unsupported_feature(BlockDriverState *bs, |
200 | Qcow2Feature *table, uint64_t mask) | |
201 | { | |
202 | while (table && table->name[0] != '\0') { | |
203 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
204 | if (mask & (1 << table->bit)) { | |
205 | report_unsupported(bs, "%.46s",table->name); | |
206 | mask &= ~(1 << table->bit); | |
207 | } | |
208 | } | |
209 | table++; | |
210 | } | |
211 | ||
212 | if (mask) { | |
213 | report_unsupported(bs, "Unknown incompatible feature: %" PRIx64, mask); | |
214 | } | |
215 | } | |
216 | ||
7c80ab3f | 217 | static int qcow2_open(BlockDriverState *bs, int flags) |
585f8587 FB |
218 | { |
219 | BDRVQcowState *s = bs->opaque; | |
6d85a57e | 220 | int len, i, ret = 0; |
585f8587 | 221 | QCowHeader header; |
9b80ddf3 | 222 | uint64_t ext_end; |
585f8587 | 223 | |
6d85a57e JS |
224 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
225 | if (ret < 0) { | |
585f8587 | 226 | goto fail; |
6d85a57e | 227 | } |
585f8587 FB |
228 | be32_to_cpus(&header.magic); |
229 | be32_to_cpus(&header.version); | |
230 | be64_to_cpus(&header.backing_file_offset); | |
231 | be32_to_cpus(&header.backing_file_size); | |
232 | be64_to_cpus(&header.size); | |
233 | be32_to_cpus(&header.cluster_bits); | |
234 | be32_to_cpus(&header.crypt_method); | |
235 | be64_to_cpus(&header.l1_table_offset); | |
236 | be32_to_cpus(&header.l1_size); | |
237 | be64_to_cpus(&header.refcount_table_offset); | |
238 | be32_to_cpus(&header.refcount_table_clusters); | |
239 | be64_to_cpus(&header.snapshots_offset); | |
240 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 241 | |
e8cdcec1 | 242 | if (header.magic != QCOW_MAGIC) { |
6d85a57e | 243 | ret = -EINVAL; |
585f8587 | 244 | goto fail; |
6d85a57e | 245 | } |
6744cbab KW |
246 | if (header.version < 2 || header.version > 3) { |
247 | report_unsupported(bs, "QCOW version %d", header.version); | |
248 | ret = -ENOTSUP; | |
249 | goto fail; | |
250 | } | |
251 | ||
252 | s->qcow_version = header.version; | |
253 | ||
254 | /* Initialise version 3 header fields */ | |
255 | if (header.version == 2) { | |
256 | header.incompatible_features = 0; | |
257 | header.compatible_features = 0; | |
258 | header.autoclear_features = 0; | |
259 | header.refcount_order = 4; | |
260 | header.header_length = 72; | |
261 | } else { | |
262 | be64_to_cpus(&header.incompatible_features); | |
263 | be64_to_cpus(&header.compatible_features); | |
264 | be64_to_cpus(&header.autoclear_features); | |
265 | be32_to_cpus(&header.refcount_order); | |
266 | be32_to_cpus(&header.header_length); | |
267 | } | |
268 | ||
269 | if (header.header_length > sizeof(header)) { | |
270 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
271 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
272 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
273 | s->unknown_header_fields_size); | |
274 | if (ret < 0) { | |
275 | goto fail; | |
276 | } | |
277 | } | |
278 | ||
cfcc4c62 KW |
279 | if (header.backing_file_offset) { |
280 | ext_end = header.backing_file_offset; | |
281 | } else { | |
282 | ext_end = 1 << header.cluster_bits; | |
283 | } | |
284 | ||
6744cbab KW |
285 | /* Handle feature bits */ |
286 | s->incompatible_features = header.incompatible_features; | |
287 | s->compatible_features = header.compatible_features; | |
288 | s->autoclear_features = header.autoclear_features; | |
289 | ||
290 | if (s->incompatible_features != 0) { | |
cfcc4c62 KW |
291 | void *feature_table = NULL; |
292 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
293 | &feature_table); | |
294 | report_unsupported_feature(bs, feature_table, | |
295 | s->incompatible_features); | |
6744cbab KW |
296 | ret = -ENOTSUP; |
297 | goto fail; | |
298 | } | |
299 | ||
6744cbab KW |
300 | /* Check support for various header values */ |
301 | if (header.refcount_order != 4) { | |
302 | report_unsupported(bs, "%d bit reference counts", | |
303 | 1 << header.refcount_order); | |
e8cdcec1 KW |
304 | ret = -ENOTSUP; |
305 | goto fail; | |
306 | } | |
6744cbab | 307 | |
d191d12d | 308 | if (header.cluster_bits < MIN_CLUSTER_BITS || |
6d85a57e JS |
309 | header.cluster_bits > MAX_CLUSTER_BITS) { |
310 | ret = -EINVAL; | |
585f8587 | 311 | goto fail; |
6d85a57e JS |
312 | } |
313 | if (header.crypt_method > QCOW_CRYPT_AES) { | |
314 | ret = -EINVAL; | |
585f8587 | 315 | goto fail; |
6d85a57e | 316 | } |
585f8587 | 317 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 318 | if (s->crypt_method_header) { |
585f8587 | 319 | bs->encrypted = 1; |
6d85a57e | 320 | } |
585f8587 FB |
321 | s->cluster_bits = header.cluster_bits; |
322 | s->cluster_size = 1 << s->cluster_bits; | |
323 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
324 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ | |
325 | s->l2_size = 1 << s->l2_bits; | |
326 | bs->total_sectors = header.size / 512; | |
327 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
328 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
329 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
330 | s->refcount_table_offset = header.refcount_table_offset; | |
5fafdf24 | 331 | s->refcount_table_size = |
585f8587 FB |
332 | header.refcount_table_clusters << (s->cluster_bits - 3); |
333 | ||
334 | s->snapshots_offset = header.snapshots_offset; | |
335 | s->nb_snapshots = header.nb_snapshots; | |
336 | ||
337 | /* read the level 1 table */ | |
338 | s->l1_size = header.l1_size; | |
419b19d9 | 339 | s->l1_vm_state_index = size_to_l1(s, header.size); |
585f8587 FB |
340 | /* the L1 table must contain at least enough entries to put |
341 | header.size bytes */ | |
6d85a57e JS |
342 | if (s->l1_size < s->l1_vm_state_index) { |
343 | ret = -EINVAL; | |
585f8587 | 344 | goto fail; |
6d85a57e | 345 | } |
585f8587 | 346 | s->l1_table_offset = header.l1_table_offset; |
d191d12d | 347 | if (s->l1_size > 0) { |
7267c094 | 348 | s->l1_table = g_malloc0( |
d191d12d | 349 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
350 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
351 | s->l1_size * sizeof(uint64_t)); | |
352 | if (ret < 0) { | |
d191d12d | 353 | goto fail; |
6d85a57e | 354 | } |
d191d12d SW |
355 | for(i = 0;i < s->l1_size; i++) { |
356 | be64_to_cpus(&s->l1_table[i]); | |
357 | } | |
585f8587 | 358 | } |
29c1a730 KW |
359 | |
360 | /* alloc L2 table/refcount block cache */ | |
6af4e9ea PB |
361 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE); |
362 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE); | |
29c1a730 | 363 | |
7267c094 | 364 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 365 | /* one more sector for decompressed data alignment */ |
dea43a65 | 366 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 367 | + 512); |
585f8587 | 368 | s->cluster_cache_offset = -1; |
06d9260f | 369 | s->flags = flags; |
3b46e624 | 370 | |
6d85a57e JS |
371 | ret = qcow2_refcount_init(bs); |
372 | if (ret != 0) { | |
585f8587 | 373 | goto fail; |
6d85a57e | 374 | } |
585f8587 | 375 | |
72cf2d4f | 376 | QLIST_INIT(&s->cluster_allocs); |
f214978a | 377 | |
9b80ddf3 | 378 | /* read qcow2 extensions */ |
cfcc4c62 | 379 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) { |
6d85a57e | 380 | ret = -EINVAL; |
9b80ddf3 | 381 | goto fail; |
6d85a57e | 382 | } |
9b80ddf3 | 383 | |
585f8587 FB |
384 | /* read the backing file name */ |
385 | if (header.backing_file_offset != 0) { | |
386 | len = header.backing_file_size; | |
6d85a57e | 387 | if (len > 1023) { |
585f8587 | 388 | len = 1023; |
6d85a57e JS |
389 | } |
390 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
391 | bs->backing_file, len); | |
392 | if (ret < 0) { | |
585f8587 | 393 | goto fail; |
6d85a57e | 394 | } |
585f8587 FB |
395 | bs->backing_file[len] = '\0'; |
396 | } | |
42deb29f KW |
397 | |
398 | ret = qcow2_read_snapshots(bs); | |
399 | if (ret < 0) { | |
585f8587 | 400 | goto fail; |
6d85a57e | 401 | } |
585f8587 | 402 | |
af7b708d SH |
403 | /* Clear unknown autoclear feature bits */ |
404 | if (!bs->read_only && s->autoclear_features != 0) { | |
405 | s->autoclear_features = 0; | |
406 | ret = qcow2_update_header(bs); | |
407 | if (ret < 0) { | |
408 | goto fail; | |
409 | } | |
410 | } | |
411 | ||
68d100e9 KW |
412 | /* Initialise locks */ |
413 | qemu_co_mutex_init(&s->lock); | |
414 | ||
585f8587 | 415 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
416 | { |
417 | BdrvCheckResult result = {0}; | |
418 | qcow2_check_refcounts(bs, &result); | |
419 | } | |
585f8587 | 420 | #endif |
6d85a57e | 421 | return ret; |
585f8587 FB |
422 | |
423 | fail: | |
6744cbab | 424 | g_free(s->unknown_header_fields); |
75bab85c | 425 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
426 | qcow2_free_snapshots(bs); |
427 | qcow2_refcount_close(bs); | |
7267c094 | 428 | g_free(s->l1_table); |
29c1a730 KW |
429 | if (s->l2_table_cache) { |
430 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
431 | } | |
7267c094 | 432 | g_free(s->cluster_cache); |
dea43a65 | 433 | qemu_vfree(s->cluster_data); |
6d85a57e | 434 | return ret; |
585f8587 FB |
435 | } |
436 | ||
7c80ab3f | 437 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
438 | { |
439 | BDRVQcowState *s = bs->opaque; | |
440 | uint8_t keybuf[16]; | |
441 | int len, i; | |
3b46e624 | 442 | |
585f8587 FB |
443 | memset(keybuf, 0, 16); |
444 | len = strlen(key); | |
445 | if (len > 16) | |
446 | len = 16; | |
447 | /* XXX: we could compress the chars to 7 bits to increase | |
448 | entropy */ | |
449 | for(i = 0;i < len;i++) { | |
450 | keybuf[i] = key[i]; | |
451 | } | |
452 | s->crypt_method = s->crypt_method_header; | |
453 | ||
454 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
455 | return -1; | |
456 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
457 | return -1; | |
458 | #if 0 | |
459 | /* test */ | |
460 | { | |
461 | uint8_t in[16]; | |
462 | uint8_t out[16]; | |
463 | uint8_t tmp[16]; | |
464 | for(i=0;i<16;i++) | |
465 | in[i] = i; | |
466 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
467 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
468 | for(i = 0; i < 16; i++) | |
469 | printf(" %02x", tmp[i]); | |
470 | printf("\n"); | |
471 | for(i = 0; i < 16; i++) | |
472 | printf(" %02x", out[i]); | |
473 | printf("\n"); | |
474 | } | |
475 | #endif | |
476 | return 0; | |
477 | } | |
478 | ||
f8a2e5e3 SH |
479 | static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs, |
480 | int64_t sector_num, int nb_sectors, int *pnum) | |
585f8587 | 481 | { |
f8a2e5e3 | 482 | BDRVQcowState *s = bs->opaque; |
585f8587 | 483 | uint64_t cluster_offset; |
1c46efaa | 484 | int ret; |
585f8587 | 485 | |
095a9c58 | 486 | *pnum = nb_sectors; |
f8a2e5e3 SH |
487 | /* FIXME We can get errors here, but the bdrv_co_is_allocated interface |
488 | * can't pass them on today */ | |
489 | qemu_co_mutex_lock(&s->lock); | |
1c46efaa | 490 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 491 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa KW |
492 | if (ret < 0) { |
493 | *pnum = 0; | |
494 | } | |
095a9c58 | 495 | |
585f8587 FB |
496 | return (cluster_offset != 0); |
497 | } | |
498 | ||
a9465922 | 499 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
500 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
501 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
502 | { |
503 | int n1; | |
504 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
505 | return nb_sectors; | |
506 | if (sector_num >= bs->total_sectors) | |
507 | n1 = 0; | |
508 | else | |
509 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 510 | |
e0d9c6f9 | 511 | qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); |
bd28f835 | 512 | |
a9465922 FB |
513 | return n1; |
514 | } | |
515 | ||
a968168c | 516 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 517 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 518 | { |
585f8587 | 519 | BDRVQcowState *s = bs->opaque; |
a9465922 | 520 | int index_in_cluster, n1; |
68d100e9 | 521 | int ret; |
faf575c1 | 522 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 523 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
524 | uint64_t bytes_done = 0; |
525 | QEMUIOVector hd_qiov; | |
526 | uint8_t *cluster_data = NULL; | |
585f8587 | 527 | |
3fc48d09 FZ |
528 | qemu_iovec_init(&hd_qiov, qiov->niov); |
529 | ||
530 | qemu_co_mutex_lock(&s->lock); | |
531 | ||
532 | while (remaining_sectors != 0) { | |
bd28f835 | 533 | |
5ebaa27e | 534 | /* prepare next request */ |
3fc48d09 | 535 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
536 | if (s->crypt_method) { |
537 | cur_nr_sectors = MIN(cur_nr_sectors, | |
538 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 539 | } |
5ebaa27e | 540 | |
3fc48d09 | 541 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 542 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 543 | if (ret < 0) { |
3fc48d09 | 544 | goto fail; |
8af36488 | 545 | } |
bd28f835 | 546 | |
3fc48d09 | 547 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 548 | |
3fc48d09 FZ |
549 | qemu_iovec_reset(&hd_qiov); |
550 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e FZ |
551 | cur_nr_sectors * 512); |
552 | ||
68d000a3 KW |
553 | switch (ret) { |
554 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
555 | |
556 | if (bs->backing_hd) { | |
557 | /* read from the base image */ | |
3fc48d09 FZ |
558 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
559 | sector_num, cur_nr_sectors); | |
5ebaa27e FZ |
560 | if (n1 > 0) { |
561 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
562 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 FZ |
563 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
564 | n1, &hd_qiov); | |
5ebaa27e FZ |
565 | qemu_co_mutex_lock(&s->lock); |
566 | if (ret < 0) { | |
3fc48d09 | 567 | goto fail; |
5ebaa27e FZ |
568 | } |
569 | } | |
570 | } else { | |
571 | /* Note: in this case, no need to wait */ | |
3fc48d09 | 572 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); |
5ebaa27e | 573 | } |
68d000a3 KW |
574 | break; |
575 | ||
6377af48 KW |
576 | case QCOW2_CLUSTER_ZERO: |
577 | if (s->qcow_version < 3) { | |
578 | ret = -EIO; | |
579 | goto fail; | |
580 | } | |
581 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); | |
582 | break; | |
583 | ||
68d000a3 | 584 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
585 | /* add AIO support for compressed blocks ? */ |
586 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
587 | if (ret < 0) { | |
3fc48d09 | 588 | goto fail; |
bd28f835 KW |
589 | } |
590 | ||
3fc48d09 | 591 | qemu_iovec_from_buffer(&hd_qiov, |
5ebaa27e | 592 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 593 | 512 * cur_nr_sectors); |
68d000a3 KW |
594 | break; |
595 | ||
596 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 597 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
598 | ret = -EIO; |
599 | goto fail; | |
5ebaa27e | 600 | } |
bd28f835 | 601 | |
5ebaa27e FZ |
602 | if (s->crypt_method) { |
603 | /* | |
604 | * For encrypted images, read everything into a temporary | |
605 | * contiguous buffer on which the AES functions can work. | |
606 | */ | |
3fc48d09 FZ |
607 | if (!cluster_data) { |
608 | cluster_data = | |
dea43a65 | 609 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
610 | } |
611 | ||
612 | assert(cur_nr_sectors <= | |
613 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
614 | qemu_iovec_reset(&hd_qiov); |
615 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
616 | 512 * cur_nr_sectors); |
617 | } | |
618 | ||
619 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
620 | qemu_co_mutex_unlock(&s->lock); | |
621 | ret = bdrv_co_readv(bs->file, | |
622 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 623 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
624 | qemu_co_mutex_lock(&s->lock); |
625 | if (ret < 0) { | |
3fc48d09 | 626 | goto fail; |
5ebaa27e FZ |
627 | } |
628 | if (s->crypt_method) { | |
3fc48d09 FZ |
629 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
630 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
631 | qemu_iovec_reset(&hd_qiov); | |
632 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 633 | cur_nr_sectors * 512); |
3fc48d09 | 634 | qemu_iovec_from_buffer(&hd_qiov, cluster_data, |
5ebaa27e FZ |
635 | 512 * cur_nr_sectors); |
636 | } | |
68d000a3 KW |
637 | break; |
638 | ||
639 | default: | |
640 | g_assert_not_reached(); | |
641 | ret = -EIO; | |
642 | goto fail; | |
faf575c1 | 643 | } |
f141eafe | 644 | |
3fc48d09 FZ |
645 | remaining_sectors -= cur_nr_sectors; |
646 | sector_num += cur_nr_sectors; | |
647 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 648 | } |
3fc48d09 | 649 | ret = 0; |
faf575c1 | 650 | |
3fc48d09 | 651 | fail: |
68d100e9 | 652 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 653 | |
3fc48d09 | 654 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 655 | qemu_vfree(cluster_data); |
68d100e9 KW |
656 | |
657 | return ret; | |
585f8587 FB |
658 | } |
659 | ||
68d100e9 | 660 | static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) |
f214978a | 661 | { |
f214978a KW |
662 | /* Take the request off the list of running requests */ |
663 | if (m->nb_clusters != 0) { | |
72cf2d4f | 664 | QLIST_REMOVE(m, next_in_flight); |
f214978a KW |
665 | } |
666 | ||
d4c146f0 | 667 | /* Restart all dependent requests */ |
68d100e9 KW |
668 | if (!qemu_co_queue_empty(&m->dependent_requests)) { |
669 | qemu_co_mutex_unlock(&s->lock); | |
e8ee5e4c | 670 | qemu_co_queue_restart_all(&m->dependent_requests); |
68d100e9 | 671 | qemu_co_mutex_lock(&s->lock); |
f214978a | 672 | } |
f214978a KW |
673 | } |
674 | ||
a968168c | 675 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
676 | int64_t sector_num, |
677 | int remaining_sectors, | |
678 | QEMUIOVector *qiov) | |
585f8587 | 679 | { |
585f8587 | 680 | BDRVQcowState *s = bs->opaque; |
585f8587 | 681 | int index_in_cluster; |
095a9c58 | 682 | int n_end; |
68d100e9 | 683 | int ret; |
faf575c1 | 684 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 685 | uint64_t cluster_offset; |
3fc48d09 FZ |
686 | QEMUIOVector hd_qiov; |
687 | uint64_t bytes_done = 0; | |
688 | uint8_t *cluster_data = NULL; | |
8e217d53 KW |
689 | QCowL2Meta l2meta = { |
690 | .nb_clusters = 0, | |
691 | }; | |
c2271403 | 692 | |
3cce16f4 KW |
693 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
694 | remaining_sectors); | |
695 | ||
c2271403 | 696 | qemu_co_queue_init(&l2meta.dependent_requests); |
585f8587 | 697 | |
3fc48d09 FZ |
698 | qemu_iovec_init(&hd_qiov, qiov->niov); |
699 | ||
700 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 701 | |
3fc48d09 FZ |
702 | qemu_co_mutex_lock(&s->lock); |
703 | ||
704 | while (remaining_sectors != 0) { | |
705 | ||
3cce16f4 | 706 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 FZ |
707 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
708 | n_end = index_in_cluster + remaining_sectors; | |
5ebaa27e FZ |
709 | if (s->crypt_method && |
710 | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { | |
711 | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; | |
712 | } | |
095a9c58 | 713 | |
3fc48d09 | 714 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
5ebaa27e FZ |
715 | index_in_cluster, n_end, &cur_nr_sectors, &l2meta); |
716 | if (ret < 0) { | |
3fc48d09 | 717 | goto fail; |
5ebaa27e | 718 | } |
148da7ea | 719 | |
5ebaa27e FZ |
720 | cluster_offset = l2meta.cluster_offset; |
721 | assert((cluster_offset & 511) == 0); | |
148da7ea | 722 | |
3fc48d09 FZ |
723 | qemu_iovec_reset(&hd_qiov); |
724 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 725 | cur_nr_sectors * 512); |
6f5f060b | 726 | |
5ebaa27e | 727 | if (s->crypt_method) { |
3fc48d09 | 728 | if (!cluster_data) { |
dea43a65 | 729 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
730 | s->cluster_size); |
731 | } | |
6f5f060b | 732 | |
3fc48d09 | 733 | assert(hd_qiov.size <= |
5ebaa27e | 734 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
3fc48d09 | 735 | qemu_iovec_to_buffer(&hd_qiov, cluster_data); |
6f5f060b | 736 | |
3fc48d09 FZ |
737 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
738 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 739 | |
3fc48d09 FZ |
740 | qemu_iovec_reset(&hd_qiov); |
741 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
742 | cur_nr_sectors * 512); |
743 | } | |
6f5f060b | 744 | |
5ebaa27e FZ |
745 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
746 | qemu_co_mutex_unlock(&s->lock); | |
3cce16f4 KW |
747 | trace_qcow2_writev_data(qemu_coroutine_self(), |
748 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
749 | ret = bdrv_co_writev(bs->file, |
750 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 751 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
752 | qemu_co_mutex_lock(&s->lock); |
753 | if (ret < 0) { | |
3fc48d09 | 754 | goto fail; |
5ebaa27e | 755 | } |
f141eafe | 756 | |
5ebaa27e | 757 | ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); |
5ebaa27e | 758 | if (ret < 0) { |
3fc48d09 | 759 | goto fail; |
5ebaa27e | 760 | } |
faf575c1 | 761 | |
0fa9131a KW |
762 | run_dependent_requests(s, &l2meta); |
763 | ||
3fc48d09 FZ |
764 | remaining_sectors -= cur_nr_sectors; |
765 | sector_num += cur_nr_sectors; | |
766 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 767 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 768 | } |
3fc48d09 | 769 | ret = 0; |
faf575c1 | 770 | |
3fc48d09 | 771 | fail: |
0fa9131a KW |
772 | run_dependent_requests(s, &l2meta); |
773 | ||
68d100e9 | 774 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 775 | |
3fc48d09 | 776 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 777 | qemu_vfree(cluster_data); |
3cce16f4 | 778 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 779 | |
68d100e9 | 780 | return ret; |
585f8587 FB |
781 | } |
782 | ||
7c80ab3f | 783 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
784 | { |
785 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 786 | g_free(s->l1_table); |
29c1a730 KW |
787 | |
788 | qcow2_cache_flush(bs, s->l2_table_cache); | |
789 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
790 | ||
791 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
792 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
793 | ||
6744cbab | 794 | g_free(s->unknown_header_fields); |
75bab85c | 795 | cleanup_unknown_header_ext(bs); |
6744cbab | 796 | |
7267c094 | 797 | g_free(s->cluster_cache); |
dea43a65 | 798 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 799 | qcow2_refcount_close(bs); |
28c1202b | 800 | qcow2_free_snapshots(bs); |
585f8587 FB |
801 | } |
802 | ||
06d9260f AL |
803 | static void qcow2_invalidate_cache(BlockDriverState *bs) |
804 | { | |
805 | BDRVQcowState *s = bs->opaque; | |
806 | int flags = s->flags; | |
807 | AES_KEY aes_encrypt_key; | |
808 | AES_KEY aes_decrypt_key; | |
809 | uint32_t crypt_method = 0; | |
810 | ||
811 | /* | |
812 | * Backing files are read-only which makes all of their metadata immutable, | |
813 | * that means we don't have to worry about reopening them here. | |
814 | */ | |
815 | ||
816 | if (s->crypt_method) { | |
817 | crypt_method = s->crypt_method; | |
818 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
819 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
820 | } | |
821 | ||
822 | qcow2_close(bs); | |
823 | ||
824 | memset(s, 0, sizeof(BDRVQcowState)); | |
825 | qcow2_open(bs, flags); | |
826 | ||
827 | if (crypt_method) { | |
828 | s->crypt_method = crypt_method; | |
829 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
830 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
831 | } | |
832 | } | |
833 | ||
e24e49e6 KW |
834 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
835 | size_t len, size_t buflen) | |
836 | { | |
837 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
838 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
839 | ||
840 | if (buflen < ext_len) { | |
841 | return -ENOSPC; | |
842 | } | |
843 | ||
844 | *ext_backing_fmt = (QCowExtension) { | |
845 | .magic = cpu_to_be32(magic), | |
846 | .len = cpu_to_be32(len), | |
847 | }; | |
848 | memcpy(buf + sizeof(QCowExtension), s, len); | |
849 | ||
850 | return ext_len; | |
851 | } | |
852 | ||
756e6736 | 853 | /* |
e24e49e6 KW |
854 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
855 | * the backing file name and all extensions. qcow2 was not designed to allow | |
856 | * such changes, so if we run out of space (we can only use the first cluster) | |
857 | * this function may fail. | |
756e6736 KW |
858 | * |
859 | * Returns 0 on success, -errno in error cases. | |
860 | */ | |
e24e49e6 | 861 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 862 | { |
756e6736 | 863 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
864 | QCowHeader *header; |
865 | char *buf; | |
866 | size_t buflen = s->cluster_size; | |
756e6736 | 867 | int ret; |
e24e49e6 KW |
868 | uint64_t total_size; |
869 | uint32_t refcount_table_clusters; | |
6744cbab | 870 | size_t header_length; |
75bab85c | 871 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 872 | |
e24e49e6 | 873 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 874 | |
e24e49e6 KW |
875 | /* Header structure */ |
876 | header = (QCowHeader*) buf; | |
756e6736 | 877 | |
e24e49e6 KW |
878 | if (buflen < sizeof(*header)) { |
879 | ret = -ENOSPC; | |
880 | goto fail; | |
756e6736 KW |
881 | } |
882 | ||
6744cbab | 883 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
884 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
885 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
886 | ||
887 | *header = (QCowHeader) { | |
6744cbab | 888 | /* Version 2 fields */ |
e24e49e6 | 889 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 890 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
891 | .backing_file_offset = 0, |
892 | .backing_file_size = 0, | |
893 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
894 | .size = cpu_to_be64(total_size), | |
895 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
896 | .l1_size = cpu_to_be32(s->l1_size), | |
897 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
898 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
899 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
900 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
901 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
902 | |
903 | /* Version 3 fields */ | |
904 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
905 | .compatible_features = cpu_to_be64(s->compatible_features), | |
906 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
907 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
908 | .header_length = cpu_to_be32(header_length), | |
e24e49e6 | 909 | }; |
756e6736 | 910 | |
6744cbab KW |
911 | /* For older versions, write a shorter header */ |
912 | switch (s->qcow_version) { | |
913 | case 2: | |
914 | ret = offsetof(QCowHeader, incompatible_features); | |
915 | break; | |
916 | case 3: | |
917 | ret = sizeof(*header); | |
918 | break; | |
919 | default: | |
b6c14762 JM |
920 | ret = -EINVAL; |
921 | goto fail; | |
6744cbab KW |
922 | } |
923 | ||
924 | buf += ret; | |
925 | buflen -= ret; | |
926 | memset(buf, 0, buflen); | |
927 | ||
928 | /* Preserve any unknown field in the header */ | |
929 | if (s->unknown_header_fields_size) { | |
930 | if (buflen < s->unknown_header_fields_size) { | |
931 | ret = -ENOSPC; | |
932 | goto fail; | |
933 | } | |
934 | ||
935 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
936 | buf += s->unknown_header_fields_size; | |
937 | buflen -= s->unknown_header_fields_size; | |
938 | } | |
756e6736 | 939 | |
e24e49e6 KW |
940 | /* Backing file format header extension */ |
941 | if (*bs->backing_format) { | |
942 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
943 | bs->backing_format, strlen(bs->backing_format), | |
944 | buflen); | |
945 | if (ret < 0) { | |
946 | goto fail; | |
756e6736 KW |
947 | } |
948 | ||
e24e49e6 KW |
949 | buf += ret; |
950 | buflen -= ret; | |
756e6736 KW |
951 | } |
952 | ||
cfcc4c62 KW |
953 | /* Feature table */ |
954 | Qcow2Feature features[] = { | |
955 | /* no feature defined yet */ | |
956 | }; | |
957 | ||
958 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
959 | features, sizeof(features), buflen); | |
960 | if (ret < 0) { | |
961 | goto fail; | |
962 | } | |
963 | buf += ret; | |
964 | buflen -= ret; | |
965 | ||
75bab85c KW |
966 | /* Keep unknown header extensions */ |
967 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
968 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
969 | if (ret < 0) { | |
970 | goto fail; | |
971 | } | |
972 | ||
973 | buf += ret; | |
974 | buflen -= ret; | |
975 | } | |
976 | ||
e24e49e6 KW |
977 | /* End of header extensions */ |
978 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
979 | if (ret < 0) { |
980 | goto fail; | |
981 | } | |
982 | ||
e24e49e6 KW |
983 | buf += ret; |
984 | buflen -= ret; | |
756e6736 | 985 | |
e24e49e6 KW |
986 | /* Backing file name */ |
987 | if (*bs->backing_file) { | |
988 | size_t backing_file_len = strlen(bs->backing_file); | |
989 | ||
990 | if (buflen < backing_file_len) { | |
991 | ret = -ENOSPC; | |
992 | goto fail; | |
993 | } | |
994 | ||
995 | strncpy(buf, bs->backing_file, buflen); | |
996 | ||
997 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
998 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
999 | } |
1000 | ||
e24e49e6 KW |
1001 | /* Write the new header */ |
1002 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1003 | if (ret < 0) { |
1004 | goto fail; | |
1005 | } | |
1006 | ||
1007 | ret = 0; | |
1008 | fail: | |
e24e49e6 | 1009 | qemu_vfree(header); |
756e6736 KW |
1010 | return ret; |
1011 | } | |
1012 | ||
1013 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1014 | const char *backing_file, const char *backing_fmt) | |
1015 | { | |
e24e49e6 KW |
1016 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
1017 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1018 | ||
1019 | return qcow2_update_header(bs); | |
756e6736 KW |
1020 | } |
1021 | ||
a35e1c17 KW |
1022 | static int preallocate(BlockDriverState *bs) |
1023 | { | |
a35e1c17 KW |
1024 | uint64_t nb_sectors; |
1025 | uint64_t offset; | |
1026 | int num; | |
148da7ea | 1027 | int ret; |
a35e1c17 KW |
1028 | QCowL2Meta meta; |
1029 | ||
1030 | nb_sectors = bdrv_getlength(bs) >> 9; | |
1031 | offset = 0; | |
68d100e9 | 1032 | qemu_co_queue_init(&meta.dependent_requests); |
148da7ea | 1033 | meta.cluster_offset = 0; |
a35e1c17 KW |
1034 | |
1035 | while (nb_sectors) { | |
1036 | num = MIN(nb_sectors, INT_MAX >> 9); | |
148da7ea | 1037 | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta); |
148da7ea | 1038 | if (ret < 0) { |
19dbcbf7 | 1039 | return ret; |
a35e1c17 KW |
1040 | } |
1041 | ||
19dbcbf7 KW |
1042 | ret = qcow2_alloc_cluster_link_l2(bs, &meta); |
1043 | if (ret < 0) { | |
148da7ea | 1044 | qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); |
19dbcbf7 | 1045 | return ret; |
a35e1c17 KW |
1046 | } |
1047 | ||
f214978a KW |
1048 | /* There are no dependent requests, but we need to remove our request |
1049 | * from the list of in-flight requests */ | |
68d100e9 | 1050 | run_dependent_requests(bs->opaque, &meta); |
f214978a | 1051 | |
a35e1c17 KW |
1052 | /* TODO Preallocate data if requested */ |
1053 | ||
1054 | nb_sectors -= num; | |
1055 | offset += num << 9; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * It is expected that the image file is large enough to actually contain | |
1060 | * all of the allocated clusters (otherwise we get failing reads after | |
1061 | * EOF). Extend the image to the last allocated sector. | |
1062 | */ | |
148da7ea | 1063 | if (meta.cluster_offset != 0) { |
ea80b906 KW |
1064 | uint8_t buf[512]; |
1065 | memset(buf, 0, 512); | |
19dbcbf7 KW |
1066 | ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); |
1067 | if (ret < 0) { | |
1068 | return ret; | |
1069 | } | |
a35e1c17 KW |
1070 | } |
1071 | ||
1072 | return 0; | |
1073 | } | |
1074 | ||
7c80ab3f JS |
1075 | static int qcow2_create2(const char *filename, int64_t total_size, |
1076 | const char *backing_file, const char *backing_format, | |
1077 | int flags, size_t cluster_size, int prealloc, | |
6744cbab | 1078 | QEMUOptionParameter *options, int version) |
a9420734 | 1079 | { |
9b2260cb | 1080 | /* Calculate cluster_bits */ |
a9420734 KW |
1081 | int cluster_bits; |
1082 | cluster_bits = ffs(cluster_size) - 1; | |
1083 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1084 | (1 << cluster_bits) != cluster_size) | |
1085 | { | |
1086 | error_report( | |
6daf194d | 1087 | "Cluster size must be a power of two between %d and %dk", |
a9420734 KW |
1088 | 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
1089 | return -EINVAL; | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * Open the image file and write a minimal qcow2 header. | |
1094 | * | |
1095 | * We keep things simple and start with a zero-sized image. We also | |
1096 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1097 | * inconsistency later. | |
1098 | * | |
1099 | * We do need a refcount table because growing the refcount table means | |
1100 | * allocating two new refcount blocks - the seconds of which would be at | |
1101 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1102 | * size for any qcow2 image. | |
1103 | */ | |
1104 | BlockDriverState* bs; | |
1105 | QCowHeader header; | |
1106 | uint8_t* refcount_table; | |
1107 | int ret; | |
1108 | ||
1109 | ret = bdrv_create_file(filename, options); | |
1110 | if (ret < 0) { | |
1111 | return ret; | |
1112 | } | |
1113 | ||
1114 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); | |
1115 | if (ret < 0) { | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | /* Write the header */ | |
1120 | memset(&header, 0, sizeof(header)); | |
1121 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
6744cbab | 1122 | header.version = cpu_to_be32(version); |
a9420734 KW |
1123 | header.cluster_bits = cpu_to_be32(cluster_bits); |
1124 | header.size = cpu_to_be64(0); | |
1125 | header.l1_table_offset = cpu_to_be64(0); | |
1126 | header.l1_size = cpu_to_be32(0); | |
1127 | header.refcount_table_offset = cpu_to_be64(cluster_size); | |
1128 | header.refcount_table_clusters = cpu_to_be32(1); | |
6744cbab KW |
1129 | header.refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT); |
1130 | header.header_length = cpu_to_be32(sizeof(header)); | |
a9420734 KW |
1131 | |
1132 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
1133 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); | |
1134 | } else { | |
1135 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
1136 | } | |
1137 | ||
1138 | ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); | |
1139 | if (ret < 0) { | |
1140 | goto out; | |
1141 | } | |
1142 | ||
1143 | /* Write an empty refcount table */ | |
7267c094 | 1144 | refcount_table = g_malloc0(cluster_size); |
a9420734 | 1145 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
7267c094 | 1146 | g_free(refcount_table); |
a9420734 KW |
1147 | |
1148 | if (ret < 0) { | |
1149 | goto out; | |
1150 | } | |
1151 | ||
1152 | bdrv_close(bs); | |
1153 | ||
1154 | /* | |
1155 | * And now open the image and make it consistent first (i.e. increase the | |
1156 | * refcount of the cluster that is occupied by the header and the refcount | |
1157 | * table) | |
1158 | */ | |
1159 | BlockDriver* drv = bdrv_find_format("qcow2"); | |
1160 | assert(drv != NULL); | |
e1a7107f KW |
1161 | ret = bdrv_open(bs, filename, |
1162 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); | |
a9420734 KW |
1163 | if (ret < 0) { |
1164 | goto out; | |
1165 | } | |
1166 | ||
1167 | ret = qcow2_alloc_clusters(bs, 2 * cluster_size); | |
1168 | if (ret < 0) { | |
1169 | goto out; | |
1170 | ||
1171 | } else if (ret != 0) { | |
1172 | error_report("Huh, first cluster in empty image is already in use?"); | |
1173 | abort(); | |
1174 | } | |
1175 | ||
1176 | /* Okay, now that we have a valid image, let's give it the right size */ | |
1177 | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); | |
1178 | if (ret < 0) { | |
1179 | goto out; | |
1180 | } | |
1181 | ||
1182 | /* Want a backing file? There you go.*/ | |
1183 | if (backing_file) { | |
1184 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1185 | if (ret < 0) { | |
1186 | goto out; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | /* And if we're supposed to preallocate metadata, do that now */ | |
1191 | if (prealloc) { | |
15552c4a ZYW |
1192 | BDRVQcowState *s = bs->opaque; |
1193 | qemu_co_mutex_lock(&s->lock); | |
a9420734 | 1194 | ret = preallocate(bs); |
15552c4a | 1195 | qemu_co_mutex_unlock(&s->lock); |
a9420734 KW |
1196 | if (ret < 0) { |
1197 | goto out; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | ret = 0; | |
1202 | out: | |
1203 | bdrv_delete(bs); | |
1204 | return ret; | |
1205 | } | |
de5f3f40 | 1206 | |
7c80ab3f | 1207 | static int qcow2_create(const char *filename, QEMUOptionParameter *options) |
de5f3f40 KW |
1208 | { |
1209 | const char *backing_file = NULL; | |
1210 | const char *backing_fmt = NULL; | |
1211 | uint64_t sectors = 0; | |
1212 | int flags = 0; | |
99cce9fa | 1213 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1214 | int prealloc = 0; |
6744cbab | 1215 | int version = 2; |
de5f3f40 KW |
1216 | |
1217 | /* Read out options */ | |
1218 | while (options && options->name) { | |
1219 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1220 | sectors = options->value.n / 512; | |
1221 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1222 | backing_file = options->value.s; | |
1223 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
1224 | backing_fmt = options->value.s; | |
1225 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
1226 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
1227 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { | |
1228 | if (options->value.n) { | |
1229 | cluster_size = options->value.n; | |
1230 | } | |
1231 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { | |
1232 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
1233 | prealloc = 0; | |
1234 | } else if (!strcmp(options->value.s, "metadata")) { | |
1235 | prealloc = 1; | |
1236 | } else { | |
1237 | fprintf(stderr, "Invalid preallocation mode: '%s'\n", | |
1238 | options->value.s); | |
1239 | return -EINVAL; | |
1240 | } | |
6744cbab KW |
1241 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
1242 | if (!options->value.s || !strcmp(options->value.s, "0.10")) { | |
1243 | version = 2; | |
1244 | } else if (!strcmp(options->value.s, "1.1")) { | |
1245 | version = 3; | |
1246 | } else { | |
1247 | fprintf(stderr, "Invalid compatibility level: '%s'\n", | |
1248 | options->value.s); | |
1249 | return -EINVAL; | |
1250 | } | |
de5f3f40 KW |
1251 | } |
1252 | options++; | |
1253 | } | |
1254 | ||
1255 | if (backing_file && prealloc) { | |
1256 | fprintf(stderr, "Backing file and preallocation cannot be used at " | |
1257 | "the same time\n"); | |
1258 | return -EINVAL; | |
1259 | } | |
1260 | ||
7c80ab3f | 1261 | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
6744cbab | 1262 | cluster_size, prealloc, options, version); |
de5f3f40 KW |
1263 | } |
1264 | ||
7c80ab3f | 1265 | static int qcow2_make_empty(BlockDriverState *bs) |
20d97356 BS |
1266 | { |
1267 | #if 0 | |
1268 | /* XXX: not correct */ | |
1269 | BDRVQcowState *s = bs->opaque; | |
1270 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
1271 | int ret; | |
1272 | ||
1273 | memset(s->l1_table, 0, l1_length); | |
66f82cee | 1274 | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) |
20d97356 | 1275 | return -1; |
66f82cee | 1276 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
20d97356 BS |
1277 | if (ret < 0) |
1278 | return ret; | |
1279 | ||
1280 | l2_cache_reset(bs); | |
1281 | #endif | |
1282 | return 0; | |
1283 | } | |
1284 | ||
621f0589 KW |
1285 | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
1286 | int64_t sector_num, int nb_sectors) | |
1287 | { | |
1288 | int ret; | |
1289 | BDRVQcowState *s = bs->opaque; | |
1290 | ||
1291 | /* Emulate misaligned zero writes */ | |
1292 | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { | |
1293 | return -ENOTSUP; | |
1294 | } | |
1295 | ||
1296 | /* Whatever is left can use real zero clusters */ | |
1297 | qemu_co_mutex_lock(&s->lock); | |
1298 | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
1299 | nb_sectors); | |
1300 | qemu_co_mutex_unlock(&s->lock); | |
1301 | ||
1302 | return ret; | |
1303 | } | |
1304 | ||
6db39ae2 PB |
1305 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1306 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1307 | { |
6db39ae2 PB |
1308 | int ret; |
1309 | BDRVQcowState *s = bs->opaque; | |
1310 | ||
1311 | qemu_co_mutex_lock(&s->lock); | |
1312 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
5ea929e3 | 1313 | nb_sectors); |
6db39ae2 PB |
1314 | qemu_co_mutex_unlock(&s->lock); |
1315 | return ret; | |
5ea929e3 KW |
1316 | } |
1317 | ||
419b19d9 SH |
1318 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1319 | { | |
1320 | BDRVQcowState *s = bs->opaque; | |
1321 | int ret, new_l1_size; | |
1322 | ||
1323 | if (offset & 511) { | |
259b2173 | 1324 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1325 | return -EINVAL; |
1326 | } | |
1327 | ||
1328 | /* cannot proceed if image has snapshots */ | |
1329 | if (s->nb_snapshots) { | |
259b2173 | 1330 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1331 | return -ENOTSUP; |
1332 | } | |
1333 | ||
1334 | /* shrinking is currently not supported */ | |
1335 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1336 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1337 | return -ENOTSUP; |
1338 | } | |
1339 | ||
1340 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1341 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1342 | if (ret < 0) { |
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | /* write updated header.size */ | |
1347 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1348 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1349 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1350 | if (ret < 0) { |
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | s->l1_vm_state_index = new_l1_size; | |
1355 | return 0; | |
1356 | } | |
1357 | ||
20d97356 BS |
1358 | /* XXX: put compressed sectors first, then all the cluster aligned |
1359 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1360 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1361 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1362 | { |
1363 | BDRVQcowState *s = bs->opaque; | |
1364 | z_stream strm; | |
1365 | int ret, out_len; | |
1366 | uint8_t *out_buf; | |
1367 | uint64_t cluster_offset; | |
1368 | ||
1369 | if (nb_sectors == 0) { | |
1370 | /* align end of file to a sector boundary to ease reading with | |
1371 | sector based I/Os */ | |
66f82cee | 1372 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1373 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1374 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1375 | return 0; |
1376 | } | |
1377 | ||
1378 | if (nb_sectors != s->cluster_sectors) | |
1379 | return -EINVAL; | |
1380 | ||
7267c094 | 1381 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1382 | |
1383 | /* best compression, small window, no zlib header */ | |
1384 | memset(&strm, 0, sizeof(strm)); | |
1385 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1386 | Z_DEFLATED, -12, | |
1387 | 9, Z_DEFAULT_STRATEGY); | |
1388 | if (ret != 0) { | |
8f1efd00 KW |
1389 | ret = -EINVAL; |
1390 | goto fail; | |
20d97356 BS |
1391 | } |
1392 | ||
1393 | strm.avail_in = s->cluster_size; | |
1394 | strm.next_in = (uint8_t *)buf; | |
1395 | strm.avail_out = s->cluster_size; | |
1396 | strm.next_out = out_buf; | |
1397 | ||
1398 | ret = deflate(&strm, Z_FINISH); | |
1399 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1400 | deflateEnd(&strm); |
8f1efd00 KW |
1401 | ret = -EINVAL; |
1402 | goto fail; | |
20d97356 BS |
1403 | } |
1404 | out_len = strm.next_out - out_buf; | |
1405 | ||
1406 | deflateEnd(&strm); | |
1407 | ||
1408 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1409 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
1410 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1411 | if (ret < 0) { | |
1412 | goto fail; | |
1413 | } | |
20d97356 BS |
1414 | } else { |
1415 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
1416 | sector_num << 9, out_len); | |
8f1efd00 KW |
1417 | if (!cluster_offset) { |
1418 | ret = -EIO; | |
1419 | goto fail; | |
1420 | } | |
20d97356 | 1421 | cluster_offset &= s->cluster_offset_mask; |
66f82cee | 1422 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
1423 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1424 | if (ret < 0) { | |
1425 | goto fail; | |
20d97356 BS |
1426 | } |
1427 | } | |
1428 | ||
8f1efd00 KW |
1429 | ret = 0; |
1430 | fail: | |
7267c094 | 1431 | g_free(out_buf); |
8f1efd00 | 1432 | return ret; |
20d97356 BS |
1433 | } |
1434 | ||
a968168c | 1435 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 1436 | { |
29c1a730 KW |
1437 | BDRVQcowState *s = bs->opaque; |
1438 | int ret; | |
1439 | ||
8b94ff85 | 1440 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
1441 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1442 | if (ret < 0) { | |
c95de7e2 | 1443 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1444 | return ret; |
29c1a730 KW |
1445 | } |
1446 | ||
1447 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1448 | if (ret < 0) { | |
c95de7e2 | 1449 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1450 | return ret; |
29c1a730 | 1451 | } |
8b94ff85 | 1452 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 1453 | |
eb489bb1 KW |
1454 | return 0; |
1455 | } | |
1456 | ||
7c80ab3f | 1457 | static int64_t qcow2_vm_state_offset(BDRVQcowState *s) |
20d97356 BS |
1458 | { |
1459 | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); | |
1460 | } | |
1461 | ||
7c80ab3f | 1462 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
1463 | { |
1464 | BDRVQcowState *s = bs->opaque; | |
1465 | bdi->cluster_size = s->cluster_size; | |
7c80ab3f | 1466 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
1467 | return 0; |
1468 | } | |
1469 | ||
1470 | ||
4534ff54 KW |
1471 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, |
1472 | BdrvCheckMode fix) | |
20d97356 | 1473 | { |
166acf54 | 1474 | return qcow2_check_refcounts(bs, result, fix); |
20d97356 BS |
1475 | } |
1476 | ||
1477 | #if 0 | |
1478 | static void dump_refcounts(BlockDriverState *bs) | |
1479 | { | |
1480 | BDRVQcowState *s = bs->opaque; | |
1481 | int64_t nb_clusters, k, k1, size; | |
1482 | int refcount; | |
1483 | ||
66f82cee | 1484 | size = bdrv_getlength(bs->file); |
20d97356 BS |
1485 | nb_clusters = size_to_clusters(s, size); |
1486 | for(k = 0; k < nb_clusters;) { | |
1487 | k1 = k; | |
1488 | refcount = get_refcount(bs, k); | |
1489 | k++; | |
1490 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
1491 | k++; | |
0bfcd599 BS |
1492 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
1493 | k - k1); | |
20d97356 BS |
1494 | } |
1495 | } | |
1496 | #endif | |
1497 | ||
7c80ab3f JS |
1498 | static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1499 | int64_t pos, int size) | |
20d97356 BS |
1500 | { |
1501 | BDRVQcowState *s = bs->opaque; | |
1502 | int growable = bs->growable; | |
1503 | int ret; | |
1504 | ||
66f82cee | 1505 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 1506 | bs->growable = 1; |
7c80ab3f | 1507 | ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1508 | bs->growable = growable; |
1509 | ||
1510 | return ret; | |
1511 | } | |
1512 | ||
7c80ab3f JS |
1513 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1514 | int64_t pos, int size) | |
20d97356 BS |
1515 | { |
1516 | BDRVQcowState *s = bs->opaque; | |
1517 | int growable = bs->growable; | |
1518 | int ret; | |
1519 | ||
66f82cee | 1520 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 1521 | bs->growable = 1; |
7c80ab3f | 1522 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1523 | bs->growable = growable; |
1524 | ||
1525 | return ret; | |
1526 | } | |
1527 | ||
7c80ab3f | 1528 | static QEMUOptionParameter qcow2_create_options[] = { |
20d97356 BS |
1529 | { |
1530 | .name = BLOCK_OPT_SIZE, | |
1531 | .type = OPT_SIZE, | |
1532 | .help = "Virtual disk size" | |
1533 | }, | |
6744cbab KW |
1534 | { |
1535 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
1536 | .type = OPT_STRING, | |
1537 | .help = "Compatibility level (0.10 or 1.1)" | |
1538 | }, | |
20d97356 BS |
1539 | { |
1540 | .name = BLOCK_OPT_BACKING_FILE, | |
1541 | .type = OPT_STRING, | |
1542 | .help = "File name of a base image" | |
1543 | }, | |
1544 | { | |
1545 | .name = BLOCK_OPT_BACKING_FMT, | |
1546 | .type = OPT_STRING, | |
1547 | .help = "Image format of the base image" | |
1548 | }, | |
1549 | { | |
1550 | .name = BLOCK_OPT_ENCRYPT, | |
1551 | .type = OPT_FLAG, | |
1552 | .help = "Encrypt the image" | |
1553 | }, | |
1554 | { | |
1555 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
1556 | .type = OPT_SIZE, | |
99cce9fa KW |
1557 | .help = "qcow2 cluster size", |
1558 | .value = { .n = DEFAULT_CLUSTER_SIZE }, | |
20d97356 BS |
1559 | }, |
1560 | { | |
1561 | .name = BLOCK_OPT_PREALLOC, | |
1562 | .type = OPT_STRING, | |
1563 | .help = "Preallocation mode (allowed values: off, metadata)" | |
1564 | }, | |
1565 | { NULL } | |
1566 | }; | |
1567 | ||
1568 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
1569 | .format_name = "qcow2", |
1570 | .instance_size = sizeof(BDRVQcowState), | |
1571 | .bdrv_probe = qcow2_probe, | |
1572 | .bdrv_open = qcow2_open, | |
1573 | .bdrv_close = qcow2_close, | |
1574 | .bdrv_create = qcow2_create, | |
f8a2e5e3 | 1575 | .bdrv_co_is_allocated = qcow2_co_is_allocated, |
7c80ab3f JS |
1576 | .bdrv_set_key = qcow2_set_key, |
1577 | .bdrv_make_empty = qcow2_make_empty, | |
1578 | ||
c68b89ac KW |
1579 | .bdrv_co_readv = qcow2_co_readv, |
1580 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 1581 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 1582 | |
621f0589 | 1583 | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
6db39ae2 | 1584 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 1585 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 1586 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
1587 | |
1588 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
1589 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
1590 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
1591 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
51ef6727 | 1592 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
7c80ab3f | 1593 | .bdrv_get_info = qcow2_get_info, |
20d97356 | 1594 | |
7c80ab3f JS |
1595 | .bdrv_save_vmstate = qcow2_save_vmstate, |
1596 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 BS |
1597 | |
1598 | .bdrv_change_backing_file = qcow2_change_backing_file, | |
1599 | ||
06d9260f AL |
1600 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
1601 | ||
7c80ab3f JS |
1602 | .create_options = qcow2_create_options, |
1603 | .bdrv_check = qcow2_check, | |
20d97356 BS |
1604 | }; |
1605 | ||
5efa9d5a AL |
1606 | static void bdrv_qcow2_init(void) |
1607 | { | |
1608 | bdrv_register(&bdrv_qcow2); | |
1609 | } | |
1610 | ||
1611 | block_init(bdrv_qcow2_init); |