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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 | |
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 | |
6744cbab KW |
185 | static void report_unsupported(BlockDriverState *bs, const char *fmt, ...) |
186 | { | |
187 | char msg[64]; | |
188 | va_list ap; | |
189 | ||
190 | va_start(ap, fmt); | |
191 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
192 | va_end(ap); | |
193 | ||
194 | qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, | |
195 | bs->device_name, "qcow2", msg); | |
196 | } | |
197 | ||
cfcc4c62 KW |
198 | static void report_unsupported_feature(BlockDriverState *bs, |
199 | Qcow2Feature *table, uint64_t mask) | |
200 | { | |
201 | while (table && table->name[0] != '\0') { | |
202 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
203 | if (mask & (1 << table->bit)) { | |
204 | report_unsupported(bs, "%.46s",table->name); | |
205 | mask &= ~(1 << table->bit); | |
206 | } | |
207 | } | |
208 | table++; | |
209 | } | |
210 | ||
211 | if (mask) { | |
212 | report_unsupported(bs, "Unknown incompatible feature: %" PRIx64, mask); | |
213 | } | |
214 | } | |
215 | ||
7c80ab3f | 216 | static int qcow2_open(BlockDriverState *bs, int flags) |
585f8587 FB |
217 | { |
218 | BDRVQcowState *s = bs->opaque; | |
6d85a57e | 219 | int len, i, ret = 0; |
585f8587 | 220 | QCowHeader header; |
9b80ddf3 | 221 | uint64_t ext_end; |
29c1a730 | 222 | bool writethrough; |
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 | ||
300 | if (!bs->read_only && s->autoclear_features != 0) { | |
301 | s->autoclear_features = 0; | |
302 | qcow2_update_header(bs); | |
303 | } | |
304 | ||
305 | /* Check support for various header values */ | |
306 | if (header.refcount_order != 4) { | |
307 | report_unsupported(bs, "%d bit reference counts", | |
308 | 1 << header.refcount_order); | |
e8cdcec1 KW |
309 | ret = -ENOTSUP; |
310 | goto fail; | |
311 | } | |
6744cbab | 312 | |
d191d12d | 313 | if (header.cluster_bits < MIN_CLUSTER_BITS || |
6d85a57e JS |
314 | header.cluster_bits > MAX_CLUSTER_BITS) { |
315 | ret = -EINVAL; | |
585f8587 | 316 | goto fail; |
6d85a57e JS |
317 | } |
318 | if (header.crypt_method > QCOW_CRYPT_AES) { | |
319 | ret = -EINVAL; | |
585f8587 | 320 | goto fail; |
6d85a57e | 321 | } |
585f8587 | 322 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 323 | if (s->crypt_method_header) { |
585f8587 | 324 | bs->encrypted = 1; |
6d85a57e | 325 | } |
585f8587 FB |
326 | s->cluster_bits = header.cluster_bits; |
327 | s->cluster_size = 1 << s->cluster_bits; | |
328 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
329 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ | |
330 | s->l2_size = 1 << s->l2_bits; | |
331 | bs->total_sectors = header.size / 512; | |
332 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
333 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
334 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
335 | s->refcount_table_offset = header.refcount_table_offset; | |
5fafdf24 | 336 | s->refcount_table_size = |
585f8587 FB |
337 | header.refcount_table_clusters << (s->cluster_bits - 3); |
338 | ||
339 | s->snapshots_offset = header.snapshots_offset; | |
340 | s->nb_snapshots = header.nb_snapshots; | |
341 | ||
342 | /* read the level 1 table */ | |
343 | s->l1_size = header.l1_size; | |
419b19d9 | 344 | s->l1_vm_state_index = size_to_l1(s, header.size); |
585f8587 FB |
345 | /* the L1 table must contain at least enough entries to put |
346 | header.size bytes */ | |
6d85a57e JS |
347 | if (s->l1_size < s->l1_vm_state_index) { |
348 | ret = -EINVAL; | |
585f8587 | 349 | goto fail; |
6d85a57e | 350 | } |
585f8587 | 351 | s->l1_table_offset = header.l1_table_offset; |
d191d12d | 352 | if (s->l1_size > 0) { |
7267c094 | 353 | s->l1_table = g_malloc0( |
d191d12d | 354 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
355 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
356 | s->l1_size * sizeof(uint64_t)); | |
357 | if (ret < 0) { | |
d191d12d | 358 | goto fail; |
6d85a57e | 359 | } |
d191d12d SW |
360 | for(i = 0;i < s->l1_size; i++) { |
361 | be64_to_cpus(&s->l1_table[i]); | |
362 | } | |
585f8587 | 363 | } |
29c1a730 KW |
364 | |
365 | /* alloc L2 table/refcount block cache */ | |
a6599793 | 366 | writethrough = ((flags & BDRV_O_CACHE_WB) == 0); |
29c1a730 KW |
367 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE, writethrough); |
368 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE, | |
369 | writethrough); | |
370 | ||
7267c094 | 371 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 372 | /* one more sector for decompressed data alignment */ |
dea43a65 | 373 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 374 | + 512); |
585f8587 | 375 | s->cluster_cache_offset = -1; |
06d9260f | 376 | s->flags = flags; |
3b46e624 | 377 | |
6d85a57e JS |
378 | ret = qcow2_refcount_init(bs); |
379 | if (ret != 0) { | |
585f8587 | 380 | goto fail; |
6d85a57e | 381 | } |
585f8587 | 382 | |
72cf2d4f | 383 | QLIST_INIT(&s->cluster_allocs); |
f214978a | 384 | |
9b80ddf3 | 385 | /* read qcow2 extensions */ |
cfcc4c62 | 386 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) { |
6d85a57e | 387 | ret = -EINVAL; |
9b80ddf3 | 388 | goto fail; |
6d85a57e | 389 | } |
9b80ddf3 | 390 | |
585f8587 FB |
391 | /* read the backing file name */ |
392 | if (header.backing_file_offset != 0) { | |
393 | len = header.backing_file_size; | |
6d85a57e | 394 | if (len > 1023) { |
585f8587 | 395 | len = 1023; |
6d85a57e JS |
396 | } |
397 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
398 | bs->backing_file, len); | |
399 | if (ret < 0) { | |
585f8587 | 400 | goto fail; |
6d85a57e | 401 | } |
585f8587 FB |
402 | bs->backing_file[len] = '\0'; |
403 | } | |
42deb29f KW |
404 | |
405 | ret = qcow2_read_snapshots(bs); | |
406 | if (ret < 0) { | |
585f8587 | 407 | goto fail; |
6d85a57e | 408 | } |
585f8587 | 409 | |
68d100e9 KW |
410 | /* Initialise locks */ |
411 | qemu_co_mutex_init(&s->lock); | |
412 | ||
585f8587 | 413 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
414 | { |
415 | BdrvCheckResult result = {0}; | |
416 | qcow2_check_refcounts(bs, &result); | |
417 | } | |
585f8587 | 418 | #endif |
6d85a57e | 419 | return ret; |
585f8587 FB |
420 | |
421 | fail: | |
6744cbab | 422 | g_free(s->unknown_header_fields); |
75bab85c | 423 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
424 | qcow2_free_snapshots(bs); |
425 | qcow2_refcount_close(bs); | |
7267c094 | 426 | g_free(s->l1_table); |
29c1a730 KW |
427 | if (s->l2_table_cache) { |
428 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
429 | } | |
7267c094 | 430 | g_free(s->cluster_cache); |
dea43a65 | 431 | qemu_vfree(s->cluster_data); |
6d85a57e | 432 | return ret; |
585f8587 FB |
433 | } |
434 | ||
7c80ab3f | 435 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
436 | { |
437 | BDRVQcowState *s = bs->opaque; | |
438 | uint8_t keybuf[16]; | |
439 | int len, i; | |
3b46e624 | 440 | |
585f8587 FB |
441 | memset(keybuf, 0, 16); |
442 | len = strlen(key); | |
443 | if (len > 16) | |
444 | len = 16; | |
445 | /* XXX: we could compress the chars to 7 bits to increase | |
446 | entropy */ | |
447 | for(i = 0;i < len;i++) { | |
448 | keybuf[i] = key[i]; | |
449 | } | |
450 | s->crypt_method = s->crypt_method_header; | |
451 | ||
452 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
453 | return -1; | |
454 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
455 | return -1; | |
456 | #if 0 | |
457 | /* test */ | |
458 | { | |
459 | uint8_t in[16]; | |
460 | uint8_t out[16]; | |
461 | uint8_t tmp[16]; | |
462 | for(i=0;i<16;i++) | |
463 | in[i] = i; | |
464 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
465 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
466 | for(i = 0; i < 16; i++) | |
467 | printf(" %02x", tmp[i]); | |
468 | printf("\n"); | |
469 | for(i = 0; i < 16; i++) | |
470 | printf(" %02x", out[i]); | |
471 | printf("\n"); | |
472 | } | |
473 | #endif | |
474 | return 0; | |
475 | } | |
476 | ||
f8a2e5e3 SH |
477 | static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs, |
478 | int64_t sector_num, int nb_sectors, int *pnum) | |
585f8587 | 479 | { |
f8a2e5e3 | 480 | BDRVQcowState *s = bs->opaque; |
585f8587 | 481 | uint64_t cluster_offset; |
1c46efaa | 482 | int ret; |
585f8587 | 483 | |
095a9c58 | 484 | *pnum = nb_sectors; |
f8a2e5e3 SH |
485 | /* FIXME We can get errors here, but the bdrv_co_is_allocated interface |
486 | * can't pass them on today */ | |
487 | qemu_co_mutex_lock(&s->lock); | |
1c46efaa | 488 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 489 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa KW |
490 | if (ret < 0) { |
491 | *pnum = 0; | |
492 | } | |
095a9c58 | 493 | |
585f8587 FB |
494 | return (cluster_offset != 0); |
495 | } | |
496 | ||
a9465922 | 497 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
498 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
499 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
500 | { |
501 | int n1; | |
502 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
503 | return nb_sectors; | |
504 | if (sector_num >= bs->total_sectors) | |
505 | n1 = 0; | |
506 | else | |
507 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 508 | |
e0d9c6f9 | 509 | qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); |
bd28f835 | 510 | |
a9465922 FB |
511 | return n1; |
512 | } | |
513 | ||
a968168c | 514 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 515 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 516 | { |
585f8587 | 517 | BDRVQcowState *s = bs->opaque; |
a9465922 | 518 | int index_in_cluster, n1; |
68d100e9 | 519 | int ret; |
faf575c1 | 520 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 521 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
522 | uint64_t bytes_done = 0; |
523 | QEMUIOVector hd_qiov; | |
524 | uint8_t *cluster_data = NULL; | |
585f8587 | 525 | |
3fc48d09 FZ |
526 | qemu_iovec_init(&hd_qiov, qiov->niov); |
527 | ||
528 | qemu_co_mutex_lock(&s->lock); | |
529 | ||
530 | while (remaining_sectors != 0) { | |
bd28f835 | 531 | |
5ebaa27e | 532 | /* prepare next request */ |
3fc48d09 | 533 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
534 | if (s->crypt_method) { |
535 | cur_nr_sectors = MIN(cur_nr_sectors, | |
536 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 537 | } |
5ebaa27e | 538 | |
3fc48d09 | 539 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 540 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 541 | if (ret < 0) { |
3fc48d09 | 542 | goto fail; |
8af36488 | 543 | } |
bd28f835 | 544 | |
3fc48d09 | 545 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 546 | |
3fc48d09 FZ |
547 | qemu_iovec_reset(&hd_qiov); |
548 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e FZ |
549 | cur_nr_sectors * 512); |
550 | ||
68d000a3 KW |
551 | switch (ret) { |
552 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
553 | |
554 | if (bs->backing_hd) { | |
555 | /* read from the base image */ | |
3fc48d09 FZ |
556 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
557 | sector_num, cur_nr_sectors); | |
5ebaa27e FZ |
558 | if (n1 > 0) { |
559 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
560 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 FZ |
561 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
562 | n1, &hd_qiov); | |
5ebaa27e FZ |
563 | qemu_co_mutex_lock(&s->lock); |
564 | if (ret < 0) { | |
3fc48d09 | 565 | goto fail; |
5ebaa27e FZ |
566 | } |
567 | } | |
568 | } else { | |
569 | /* Note: in this case, no need to wait */ | |
3fc48d09 | 570 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); |
5ebaa27e | 571 | } |
68d000a3 KW |
572 | break; |
573 | ||
6377af48 KW |
574 | case QCOW2_CLUSTER_ZERO: |
575 | if (s->qcow_version < 3) { | |
576 | ret = -EIO; | |
577 | goto fail; | |
578 | } | |
579 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); | |
580 | break; | |
581 | ||
68d000a3 | 582 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
583 | /* add AIO support for compressed blocks ? */ |
584 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
585 | if (ret < 0) { | |
3fc48d09 | 586 | goto fail; |
bd28f835 KW |
587 | } |
588 | ||
3fc48d09 | 589 | qemu_iovec_from_buffer(&hd_qiov, |
5ebaa27e | 590 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 591 | 512 * cur_nr_sectors); |
68d000a3 KW |
592 | break; |
593 | ||
594 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 595 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
596 | ret = -EIO; |
597 | goto fail; | |
5ebaa27e | 598 | } |
bd28f835 | 599 | |
5ebaa27e FZ |
600 | if (s->crypt_method) { |
601 | /* | |
602 | * For encrypted images, read everything into a temporary | |
603 | * contiguous buffer on which the AES functions can work. | |
604 | */ | |
3fc48d09 FZ |
605 | if (!cluster_data) { |
606 | cluster_data = | |
dea43a65 | 607 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
608 | } |
609 | ||
610 | assert(cur_nr_sectors <= | |
611 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
612 | qemu_iovec_reset(&hd_qiov); |
613 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
614 | 512 * cur_nr_sectors); |
615 | } | |
616 | ||
617 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
618 | qemu_co_mutex_unlock(&s->lock); | |
619 | ret = bdrv_co_readv(bs->file, | |
620 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 621 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
622 | qemu_co_mutex_lock(&s->lock); |
623 | if (ret < 0) { | |
3fc48d09 | 624 | goto fail; |
5ebaa27e FZ |
625 | } |
626 | if (s->crypt_method) { | |
3fc48d09 FZ |
627 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
628 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
629 | qemu_iovec_reset(&hd_qiov); | |
630 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 631 | cur_nr_sectors * 512); |
3fc48d09 | 632 | qemu_iovec_from_buffer(&hd_qiov, cluster_data, |
5ebaa27e FZ |
633 | 512 * cur_nr_sectors); |
634 | } | |
68d000a3 KW |
635 | break; |
636 | ||
637 | default: | |
638 | g_assert_not_reached(); | |
639 | ret = -EIO; | |
640 | goto fail; | |
faf575c1 | 641 | } |
f141eafe | 642 | |
3fc48d09 FZ |
643 | remaining_sectors -= cur_nr_sectors; |
644 | sector_num += cur_nr_sectors; | |
645 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 646 | } |
3fc48d09 | 647 | ret = 0; |
faf575c1 | 648 | |
3fc48d09 | 649 | fail: |
68d100e9 | 650 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 651 | |
3fc48d09 | 652 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 653 | qemu_vfree(cluster_data); |
68d100e9 KW |
654 | |
655 | return ret; | |
585f8587 FB |
656 | } |
657 | ||
68d100e9 | 658 | static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) |
f214978a | 659 | { |
f214978a KW |
660 | /* Take the request off the list of running requests */ |
661 | if (m->nb_clusters != 0) { | |
72cf2d4f | 662 | QLIST_REMOVE(m, next_in_flight); |
f214978a KW |
663 | } |
664 | ||
d4c146f0 | 665 | /* Restart all dependent requests */ |
68d100e9 KW |
666 | if (!qemu_co_queue_empty(&m->dependent_requests)) { |
667 | qemu_co_mutex_unlock(&s->lock); | |
e8ee5e4c | 668 | qemu_co_queue_restart_all(&m->dependent_requests); |
68d100e9 | 669 | qemu_co_mutex_lock(&s->lock); |
f214978a | 670 | } |
f214978a KW |
671 | } |
672 | ||
a968168c | 673 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
674 | int64_t sector_num, |
675 | int remaining_sectors, | |
676 | QEMUIOVector *qiov) | |
585f8587 | 677 | { |
585f8587 | 678 | BDRVQcowState *s = bs->opaque; |
585f8587 | 679 | int index_in_cluster; |
095a9c58 | 680 | int n_end; |
68d100e9 | 681 | int ret; |
faf575c1 | 682 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 683 | uint64_t cluster_offset; |
3fc48d09 FZ |
684 | QEMUIOVector hd_qiov; |
685 | uint64_t bytes_done = 0; | |
686 | uint8_t *cluster_data = NULL; | |
8e217d53 KW |
687 | QCowL2Meta l2meta = { |
688 | .nb_clusters = 0, | |
689 | }; | |
c2271403 | 690 | |
3cce16f4 KW |
691 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
692 | remaining_sectors); | |
693 | ||
c2271403 | 694 | qemu_co_queue_init(&l2meta.dependent_requests); |
585f8587 | 695 | |
3fc48d09 FZ |
696 | qemu_iovec_init(&hd_qiov, qiov->niov); |
697 | ||
698 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 699 | |
3fc48d09 FZ |
700 | qemu_co_mutex_lock(&s->lock); |
701 | ||
702 | while (remaining_sectors != 0) { | |
703 | ||
3cce16f4 | 704 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 FZ |
705 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
706 | n_end = index_in_cluster + remaining_sectors; | |
5ebaa27e FZ |
707 | if (s->crypt_method && |
708 | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { | |
709 | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; | |
710 | } | |
095a9c58 | 711 | |
3fc48d09 | 712 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
5ebaa27e FZ |
713 | index_in_cluster, n_end, &cur_nr_sectors, &l2meta); |
714 | if (ret < 0) { | |
3fc48d09 | 715 | goto fail; |
5ebaa27e | 716 | } |
148da7ea | 717 | |
5ebaa27e FZ |
718 | cluster_offset = l2meta.cluster_offset; |
719 | assert((cluster_offset & 511) == 0); | |
148da7ea | 720 | |
3fc48d09 FZ |
721 | qemu_iovec_reset(&hd_qiov); |
722 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 723 | cur_nr_sectors * 512); |
6f5f060b | 724 | |
5ebaa27e | 725 | if (s->crypt_method) { |
3fc48d09 | 726 | if (!cluster_data) { |
dea43a65 | 727 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
728 | s->cluster_size); |
729 | } | |
6f5f060b | 730 | |
3fc48d09 | 731 | assert(hd_qiov.size <= |
5ebaa27e | 732 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
3fc48d09 | 733 | qemu_iovec_to_buffer(&hd_qiov, cluster_data); |
6f5f060b | 734 | |
3fc48d09 FZ |
735 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
736 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 737 | |
3fc48d09 FZ |
738 | qemu_iovec_reset(&hd_qiov); |
739 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
740 | cur_nr_sectors * 512); |
741 | } | |
6f5f060b | 742 | |
5ebaa27e FZ |
743 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
744 | qemu_co_mutex_unlock(&s->lock); | |
3cce16f4 KW |
745 | trace_qcow2_writev_data(qemu_coroutine_self(), |
746 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
747 | ret = bdrv_co_writev(bs->file, |
748 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 749 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
750 | qemu_co_mutex_lock(&s->lock); |
751 | if (ret < 0) { | |
3fc48d09 | 752 | goto fail; |
5ebaa27e | 753 | } |
f141eafe | 754 | |
5ebaa27e | 755 | ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); |
5ebaa27e | 756 | if (ret < 0) { |
3fc48d09 | 757 | goto fail; |
5ebaa27e | 758 | } |
faf575c1 | 759 | |
0fa9131a KW |
760 | run_dependent_requests(s, &l2meta); |
761 | ||
3fc48d09 FZ |
762 | remaining_sectors -= cur_nr_sectors; |
763 | sector_num += cur_nr_sectors; | |
764 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 765 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 766 | } |
3fc48d09 | 767 | ret = 0; |
faf575c1 | 768 | |
3fc48d09 | 769 | fail: |
0fa9131a KW |
770 | run_dependent_requests(s, &l2meta); |
771 | ||
68d100e9 | 772 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 773 | |
3fc48d09 | 774 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 775 | qemu_vfree(cluster_data); |
3cce16f4 | 776 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 777 | |
68d100e9 | 778 | return ret; |
585f8587 FB |
779 | } |
780 | ||
7c80ab3f | 781 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
782 | { |
783 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 784 | g_free(s->l1_table); |
29c1a730 KW |
785 | |
786 | qcow2_cache_flush(bs, s->l2_table_cache); | |
787 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
788 | ||
789 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
790 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
791 | ||
6744cbab | 792 | g_free(s->unknown_header_fields); |
75bab85c | 793 | cleanup_unknown_header_ext(bs); |
6744cbab | 794 | |
7267c094 | 795 | g_free(s->cluster_cache); |
dea43a65 | 796 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 797 | qcow2_refcount_close(bs); |
28c1202b | 798 | qcow2_free_snapshots(bs); |
585f8587 FB |
799 | } |
800 | ||
06d9260f AL |
801 | static void qcow2_invalidate_cache(BlockDriverState *bs) |
802 | { | |
803 | BDRVQcowState *s = bs->opaque; | |
804 | int flags = s->flags; | |
805 | AES_KEY aes_encrypt_key; | |
806 | AES_KEY aes_decrypt_key; | |
807 | uint32_t crypt_method = 0; | |
808 | ||
809 | /* | |
810 | * Backing files are read-only which makes all of their metadata immutable, | |
811 | * that means we don't have to worry about reopening them here. | |
812 | */ | |
813 | ||
814 | if (s->crypt_method) { | |
815 | crypt_method = s->crypt_method; | |
816 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
817 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
818 | } | |
819 | ||
820 | qcow2_close(bs); | |
821 | ||
822 | memset(s, 0, sizeof(BDRVQcowState)); | |
823 | qcow2_open(bs, flags); | |
824 | ||
825 | if (crypt_method) { | |
826 | s->crypt_method = crypt_method; | |
827 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
828 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
829 | } | |
830 | } | |
831 | ||
e24e49e6 KW |
832 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
833 | size_t len, size_t buflen) | |
834 | { | |
835 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
836 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
837 | ||
838 | if (buflen < ext_len) { | |
839 | return -ENOSPC; | |
840 | } | |
841 | ||
842 | *ext_backing_fmt = (QCowExtension) { | |
843 | .magic = cpu_to_be32(magic), | |
844 | .len = cpu_to_be32(len), | |
845 | }; | |
846 | memcpy(buf + sizeof(QCowExtension), s, len); | |
847 | ||
848 | return ext_len; | |
849 | } | |
850 | ||
756e6736 | 851 | /* |
e24e49e6 KW |
852 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
853 | * the backing file name and all extensions. qcow2 was not designed to allow | |
854 | * such changes, so if we run out of space (we can only use the first cluster) | |
855 | * this function may fail. | |
756e6736 KW |
856 | * |
857 | * Returns 0 on success, -errno in error cases. | |
858 | */ | |
e24e49e6 | 859 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 860 | { |
756e6736 | 861 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
862 | QCowHeader *header; |
863 | char *buf; | |
864 | size_t buflen = s->cluster_size; | |
756e6736 | 865 | int ret; |
e24e49e6 KW |
866 | uint64_t total_size; |
867 | uint32_t refcount_table_clusters; | |
6744cbab | 868 | size_t header_length; |
75bab85c | 869 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 870 | |
e24e49e6 | 871 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 872 | |
e24e49e6 KW |
873 | /* Header structure */ |
874 | header = (QCowHeader*) buf; | |
756e6736 | 875 | |
e24e49e6 KW |
876 | if (buflen < sizeof(*header)) { |
877 | ret = -ENOSPC; | |
878 | goto fail; | |
756e6736 KW |
879 | } |
880 | ||
6744cbab | 881 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
882 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
883 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
884 | ||
885 | *header = (QCowHeader) { | |
6744cbab | 886 | /* Version 2 fields */ |
e24e49e6 | 887 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 888 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
889 | .backing_file_offset = 0, |
890 | .backing_file_size = 0, | |
891 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
892 | .size = cpu_to_be64(total_size), | |
893 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
894 | .l1_size = cpu_to_be32(s->l1_size), | |
895 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
896 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
897 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
898 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
899 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
900 | |
901 | /* Version 3 fields */ | |
902 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
903 | .compatible_features = cpu_to_be64(s->compatible_features), | |
904 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
905 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
906 | .header_length = cpu_to_be32(header_length), | |
e24e49e6 | 907 | }; |
756e6736 | 908 | |
6744cbab KW |
909 | /* For older versions, write a shorter header */ |
910 | switch (s->qcow_version) { | |
911 | case 2: | |
912 | ret = offsetof(QCowHeader, incompatible_features); | |
913 | break; | |
914 | case 3: | |
915 | ret = sizeof(*header); | |
916 | break; | |
917 | default: | |
918 | return -EINVAL; | |
919 | } | |
920 | ||
921 | buf += ret; | |
922 | buflen -= ret; | |
923 | memset(buf, 0, buflen); | |
924 | ||
925 | /* Preserve any unknown field in the header */ | |
926 | if (s->unknown_header_fields_size) { | |
927 | if (buflen < s->unknown_header_fields_size) { | |
928 | ret = -ENOSPC; | |
929 | goto fail; | |
930 | } | |
931 | ||
932 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
933 | buf += s->unknown_header_fields_size; | |
934 | buflen -= s->unknown_header_fields_size; | |
935 | } | |
756e6736 | 936 | |
e24e49e6 KW |
937 | /* Backing file format header extension */ |
938 | if (*bs->backing_format) { | |
939 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
940 | bs->backing_format, strlen(bs->backing_format), | |
941 | buflen); | |
942 | if (ret < 0) { | |
943 | goto fail; | |
756e6736 KW |
944 | } |
945 | ||
e24e49e6 KW |
946 | buf += ret; |
947 | buflen -= ret; | |
756e6736 KW |
948 | } |
949 | ||
cfcc4c62 KW |
950 | /* Feature table */ |
951 | Qcow2Feature features[] = { | |
952 | /* no feature defined yet */ | |
953 | }; | |
954 | ||
955 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
956 | features, sizeof(features), buflen); | |
957 | if (ret < 0) { | |
958 | goto fail; | |
959 | } | |
960 | buf += ret; | |
961 | buflen -= ret; | |
962 | ||
75bab85c KW |
963 | /* Keep unknown header extensions */ |
964 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
965 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
966 | if (ret < 0) { | |
967 | goto fail; | |
968 | } | |
969 | ||
970 | buf += ret; | |
971 | buflen -= ret; | |
972 | } | |
973 | ||
e24e49e6 KW |
974 | /* End of header extensions */ |
975 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
976 | if (ret < 0) { |
977 | goto fail; | |
978 | } | |
979 | ||
e24e49e6 KW |
980 | buf += ret; |
981 | buflen -= ret; | |
756e6736 | 982 | |
e24e49e6 KW |
983 | /* Backing file name */ |
984 | if (*bs->backing_file) { | |
985 | size_t backing_file_len = strlen(bs->backing_file); | |
986 | ||
987 | if (buflen < backing_file_len) { | |
988 | ret = -ENOSPC; | |
989 | goto fail; | |
990 | } | |
991 | ||
992 | strncpy(buf, bs->backing_file, buflen); | |
993 | ||
994 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
995 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
996 | } |
997 | ||
e24e49e6 KW |
998 | /* Write the new header */ |
999 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1000 | if (ret < 0) { |
1001 | goto fail; | |
1002 | } | |
1003 | ||
1004 | ret = 0; | |
1005 | fail: | |
e24e49e6 | 1006 | qemu_vfree(header); |
756e6736 KW |
1007 | return ret; |
1008 | } | |
1009 | ||
1010 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1011 | const char *backing_file, const char *backing_fmt) | |
1012 | { | |
e24e49e6 KW |
1013 | /* Backing file format doesn't make sense without a backing file */ |
1014 | if (backing_fmt && !backing_file) { | |
1015 | return -EINVAL; | |
1016 | } | |
1017 | ||
1018 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1019 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1020 | ||
1021 | return qcow2_update_header(bs); | |
756e6736 KW |
1022 | } |
1023 | ||
a35e1c17 KW |
1024 | static int preallocate(BlockDriverState *bs) |
1025 | { | |
a35e1c17 KW |
1026 | uint64_t nb_sectors; |
1027 | uint64_t offset; | |
1028 | int num; | |
148da7ea | 1029 | int ret; |
a35e1c17 KW |
1030 | QCowL2Meta meta; |
1031 | ||
1032 | nb_sectors = bdrv_getlength(bs) >> 9; | |
1033 | offset = 0; | |
68d100e9 | 1034 | qemu_co_queue_init(&meta.dependent_requests); |
148da7ea | 1035 | meta.cluster_offset = 0; |
a35e1c17 KW |
1036 | |
1037 | while (nb_sectors) { | |
1038 | num = MIN(nb_sectors, INT_MAX >> 9); | |
148da7ea | 1039 | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta); |
148da7ea | 1040 | if (ret < 0) { |
19dbcbf7 | 1041 | return ret; |
a35e1c17 KW |
1042 | } |
1043 | ||
19dbcbf7 KW |
1044 | ret = qcow2_alloc_cluster_link_l2(bs, &meta); |
1045 | if (ret < 0) { | |
148da7ea | 1046 | qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); |
19dbcbf7 | 1047 | return ret; |
a35e1c17 KW |
1048 | } |
1049 | ||
f214978a KW |
1050 | /* There are no dependent requests, but we need to remove our request |
1051 | * from the list of in-flight requests */ | |
68d100e9 | 1052 | run_dependent_requests(bs->opaque, &meta); |
f214978a | 1053 | |
a35e1c17 KW |
1054 | /* TODO Preallocate data if requested */ |
1055 | ||
1056 | nb_sectors -= num; | |
1057 | offset += num << 9; | |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * It is expected that the image file is large enough to actually contain | |
1062 | * all of the allocated clusters (otherwise we get failing reads after | |
1063 | * EOF). Extend the image to the last allocated sector. | |
1064 | */ | |
148da7ea | 1065 | if (meta.cluster_offset != 0) { |
ea80b906 KW |
1066 | uint8_t buf[512]; |
1067 | memset(buf, 0, 512); | |
19dbcbf7 KW |
1068 | ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); |
1069 | if (ret < 0) { | |
1070 | return ret; | |
1071 | } | |
a35e1c17 KW |
1072 | } |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
7c80ab3f JS |
1077 | static int qcow2_create2(const char *filename, int64_t total_size, |
1078 | const char *backing_file, const char *backing_format, | |
1079 | int flags, size_t cluster_size, int prealloc, | |
6744cbab | 1080 | QEMUOptionParameter *options, int version) |
a9420734 | 1081 | { |
9b2260cb | 1082 | /* Calculate cluster_bits */ |
a9420734 KW |
1083 | int cluster_bits; |
1084 | cluster_bits = ffs(cluster_size) - 1; | |
1085 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1086 | (1 << cluster_bits) != cluster_size) | |
1087 | { | |
1088 | error_report( | |
6daf194d | 1089 | "Cluster size must be a power of two between %d and %dk", |
a9420734 KW |
1090 | 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
1091 | return -EINVAL; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * Open the image file and write a minimal qcow2 header. | |
1096 | * | |
1097 | * We keep things simple and start with a zero-sized image. We also | |
1098 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1099 | * inconsistency later. | |
1100 | * | |
1101 | * We do need a refcount table because growing the refcount table means | |
1102 | * allocating two new refcount blocks - the seconds of which would be at | |
1103 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1104 | * size for any qcow2 image. | |
1105 | */ | |
1106 | BlockDriverState* bs; | |
1107 | QCowHeader header; | |
1108 | uint8_t* refcount_table; | |
1109 | int ret; | |
1110 | ||
1111 | ret = bdrv_create_file(filename, options); | |
1112 | if (ret < 0) { | |
1113 | return ret; | |
1114 | } | |
1115 | ||
1116 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR); | |
1117 | if (ret < 0) { | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | /* Write the header */ | |
1122 | memset(&header, 0, sizeof(header)); | |
1123 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
6744cbab | 1124 | header.version = cpu_to_be32(version); |
a9420734 KW |
1125 | header.cluster_bits = cpu_to_be32(cluster_bits); |
1126 | header.size = cpu_to_be64(0); | |
1127 | header.l1_table_offset = cpu_to_be64(0); | |
1128 | header.l1_size = cpu_to_be32(0); | |
1129 | header.refcount_table_offset = cpu_to_be64(cluster_size); | |
1130 | header.refcount_table_clusters = cpu_to_be32(1); | |
6744cbab KW |
1131 | header.refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT); |
1132 | header.header_length = cpu_to_be32(sizeof(header)); | |
a9420734 KW |
1133 | |
1134 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
1135 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); | |
1136 | } else { | |
1137 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
1138 | } | |
1139 | ||
1140 | ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); | |
1141 | if (ret < 0) { | |
1142 | goto out; | |
1143 | } | |
1144 | ||
1145 | /* Write an empty refcount table */ | |
7267c094 | 1146 | refcount_table = g_malloc0(cluster_size); |
a9420734 | 1147 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
7267c094 | 1148 | g_free(refcount_table); |
a9420734 KW |
1149 | |
1150 | if (ret < 0) { | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | bdrv_close(bs); | |
1155 | ||
1156 | /* | |
1157 | * And now open the image and make it consistent first (i.e. increase the | |
1158 | * refcount of the cluster that is occupied by the header and the refcount | |
1159 | * table) | |
1160 | */ | |
1161 | BlockDriver* drv = bdrv_find_format("qcow2"); | |
1162 | assert(drv != NULL); | |
e1a7107f KW |
1163 | ret = bdrv_open(bs, filename, |
1164 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); | |
a9420734 KW |
1165 | if (ret < 0) { |
1166 | goto out; | |
1167 | } | |
1168 | ||
1169 | ret = qcow2_alloc_clusters(bs, 2 * cluster_size); | |
1170 | if (ret < 0) { | |
1171 | goto out; | |
1172 | ||
1173 | } else if (ret != 0) { | |
1174 | error_report("Huh, first cluster in empty image is already in use?"); | |
1175 | abort(); | |
1176 | } | |
1177 | ||
1178 | /* Okay, now that we have a valid image, let's give it the right size */ | |
1179 | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); | |
1180 | if (ret < 0) { | |
1181 | goto out; | |
1182 | } | |
1183 | ||
1184 | /* Want a backing file? There you go.*/ | |
1185 | if (backing_file) { | |
1186 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1187 | if (ret < 0) { | |
1188 | goto out; | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | /* And if we're supposed to preallocate metadata, do that now */ | |
1193 | if (prealloc) { | |
1194 | ret = preallocate(bs); | |
1195 | if (ret < 0) { | |
1196 | goto out; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | ret = 0; | |
1201 | out: | |
1202 | bdrv_delete(bs); | |
1203 | return ret; | |
1204 | } | |
de5f3f40 | 1205 | |
7c80ab3f | 1206 | static int qcow2_create(const char *filename, QEMUOptionParameter *options) |
de5f3f40 KW |
1207 | { |
1208 | const char *backing_file = NULL; | |
1209 | const char *backing_fmt = NULL; | |
1210 | uint64_t sectors = 0; | |
1211 | int flags = 0; | |
99cce9fa | 1212 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1213 | int prealloc = 0; |
6744cbab | 1214 | int version = 2; |
de5f3f40 KW |
1215 | |
1216 | /* Read out options */ | |
1217 | while (options && options->name) { | |
1218 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1219 | sectors = options->value.n / 512; | |
1220 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1221 | backing_file = options->value.s; | |
1222 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
1223 | backing_fmt = options->value.s; | |
1224 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
1225 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
1226 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { | |
1227 | if (options->value.n) { | |
1228 | cluster_size = options->value.n; | |
1229 | } | |
1230 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { | |
1231 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
1232 | prealloc = 0; | |
1233 | } else if (!strcmp(options->value.s, "metadata")) { | |
1234 | prealloc = 1; | |
1235 | } else { | |
1236 | fprintf(stderr, "Invalid preallocation mode: '%s'\n", | |
1237 | options->value.s); | |
1238 | return -EINVAL; | |
1239 | } | |
6744cbab KW |
1240 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
1241 | if (!options->value.s || !strcmp(options->value.s, "0.10")) { | |
1242 | version = 2; | |
1243 | } else if (!strcmp(options->value.s, "1.1")) { | |
1244 | version = 3; | |
1245 | } else { | |
1246 | fprintf(stderr, "Invalid compatibility level: '%s'\n", | |
1247 | options->value.s); | |
1248 | return -EINVAL; | |
1249 | } | |
de5f3f40 KW |
1250 | } |
1251 | options++; | |
1252 | } | |
1253 | ||
1254 | if (backing_file && prealloc) { | |
1255 | fprintf(stderr, "Backing file and preallocation cannot be used at " | |
1256 | "the same time\n"); | |
1257 | return -EINVAL; | |
1258 | } | |
1259 | ||
7c80ab3f | 1260 | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
6744cbab | 1261 | cluster_size, prealloc, options, version); |
de5f3f40 KW |
1262 | } |
1263 | ||
7c80ab3f | 1264 | static int qcow2_make_empty(BlockDriverState *bs) |
20d97356 BS |
1265 | { |
1266 | #if 0 | |
1267 | /* XXX: not correct */ | |
1268 | BDRVQcowState *s = bs->opaque; | |
1269 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
1270 | int ret; | |
1271 | ||
1272 | memset(s->l1_table, 0, l1_length); | |
66f82cee | 1273 | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) |
20d97356 | 1274 | return -1; |
66f82cee | 1275 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
20d97356 BS |
1276 | if (ret < 0) |
1277 | return ret; | |
1278 | ||
1279 | l2_cache_reset(bs); | |
1280 | #endif | |
1281 | return 0; | |
1282 | } | |
1283 | ||
6db39ae2 PB |
1284 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1285 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1286 | { |
6db39ae2 PB |
1287 | int ret; |
1288 | BDRVQcowState *s = bs->opaque; | |
1289 | ||
1290 | qemu_co_mutex_lock(&s->lock); | |
1291 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
5ea929e3 | 1292 | nb_sectors); |
6db39ae2 PB |
1293 | qemu_co_mutex_unlock(&s->lock); |
1294 | return ret; | |
5ea929e3 KW |
1295 | } |
1296 | ||
419b19d9 SH |
1297 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1298 | { | |
1299 | BDRVQcowState *s = bs->opaque; | |
1300 | int ret, new_l1_size; | |
1301 | ||
1302 | if (offset & 511) { | |
259b2173 | 1303 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1304 | return -EINVAL; |
1305 | } | |
1306 | ||
1307 | /* cannot proceed if image has snapshots */ | |
1308 | if (s->nb_snapshots) { | |
259b2173 | 1309 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1310 | return -ENOTSUP; |
1311 | } | |
1312 | ||
1313 | /* shrinking is currently not supported */ | |
1314 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1315 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1316 | return -ENOTSUP; |
1317 | } | |
1318 | ||
1319 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1320 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1321 | if (ret < 0) { |
1322 | return ret; | |
1323 | } | |
1324 | ||
1325 | /* write updated header.size */ | |
1326 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1327 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1328 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1329 | if (ret < 0) { |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | s->l1_vm_state_index = new_l1_size; | |
1334 | return 0; | |
1335 | } | |
1336 | ||
20d97356 BS |
1337 | /* XXX: put compressed sectors first, then all the cluster aligned |
1338 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1339 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1340 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1341 | { |
1342 | BDRVQcowState *s = bs->opaque; | |
1343 | z_stream strm; | |
1344 | int ret, out_len; | |
1345 | uint8_t *out_buf; | |
1346 | uint64_t cluster_offset; | |
1347 | ||
1348 | if (nb_sectors == 0) { | |
1349 | /* align end of file to a sector boundary to ease reading with | |
1350 | sector based I/Os */ | |
66f82cee | 1351 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1352 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1353 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1354 | return 0; |
1355 | } | |
1356 | ||
1357 | if (nb_sectors != s->cluster_sectors) | |
1358 | return -EINVAL; | |
1359 | ||
7267c094 | 1360 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1361 | |
1362 | /* best compression, small window, no zlib header */ | |
1363 | memset(&strm, 0, sizeof(strm)); | |
1364 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1365 | Z_DEFLATED, -12, | |
1366 | 9, Z_DEFAULT_STRATEGY); | |
1367 | if (ret != 0) { | |
8f1efd00 KW |
1368 | ret = -EINVAL; |
1369 | goto fail; | |
20d97356 BS |
1370 | } |
1371 | ||
1372 | strm.avail_in = s->cluster_size; | |
1373 | strm.next_in = (uint8_t *)buf; | |
1374 | strm.avail_out = s->cluster_size; | |
1375 | strm.next_out = out_buf; | |
1376 | ||
1377 | ret = deflate(&strm, Z_FINISH); | |
1378 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1379 | deflateEnd(&strm); |
8f1efd00 KW |
1380 | ret = -EINVAL; |
1381 | goto fail; | |
20d97356 BS |
1382 | } |
1383 | out_len = strm.next_out - out_buf; | |
1384 | ||
1385 | deflateEnd(&strm); | |
1386 | ||
1387 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1388 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
1389 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1390 | if (ret < 0) { | |
1391 | goto fail; | |
1392 | } | |
20d97356 BS |
1393 | } else { |
1394 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
1395 | sector_num << 9, out_len); | |
8f1efd00 KW |
1396 | if (!cluster_offset) { |
1397 | ret = -EIO; | |
1398 | goto fail; | |
1399 | } | |
20d97356 | 1400 | cluster_offset &= s->cluster_offset_mask; |
66f82cee | 1401 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
1402 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1403 | if (ret < 0) { | |
1404 | goto fail; | |
20d97356 BS |
1405 | } |
1406 | } | |
1407 | ||
8f1efd00 KW |
1408 | ret = 0; |
1409 | fail: | |
7267c094 | 1410 | g_free(out_buf); |
8f1efd00 | 1411 | return ret; |
20d97356 BS |
1412 | } |
1413 | ||
a968168c | 1414 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 1415 | { |
29c1a730 KW |
1416 | BDRVQcowState *s = bs->opaque; |
1417 | int ret; | |
1418 | ||
8b94ff85 | 1419 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
1420 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1421 | if (ret < 0) { | |
c95de7e2 | 1422 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1423 | return ret; |
29c1a730 KW |
1424 | } |
1425 | ||
1426 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1427 | if (ret < 0) { | |
c95de7e2 | 1428 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1429 | return ret; |
29c1a730 | 1430 | } |
8b94ff85 | 1431 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 1432 | |
eb489bb1 KW |
1433 | return 0; |
1434 | } | |
1435 | ||
7c80ab3f | 1436 | static int64_t qcow2_vm_state_offset(BDRVQcowState *s) |
20d97356 BS |
1437 | { |
1438 | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); | |
1439 | } | |
1440 | ||
7c80ab3f | 1441 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
1442 | { |
1443 | BDRVQcowState *s = bs->opaque; | |
1444 | bdi->cluster_size = s->cluster_size; | |
7c80ab3f | 1445 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
1446 | return 0; |
1447 | } | |
1448 | ||
1449 | ||
7c80ab3f | 1450 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result) |
20d97356 | 1451 | { |
9ac228e0 | 1452 | return qcow2_check_refcounts(bs, result); |
20d97356 BS |
1453 | } |
1454 | ||
1455 | #if 0 | |
1456 | static void dump_refcounts(BlockDriverState *bs) | |
1457 | { | |
1458 | BDRVQcowState *s = bs->opaque; | |
1459 | int64_t nb_clusters, k, k1, size; | |
1460 | int refcount; | |
1461 | ||
66f82cee | 1462 | size = bdrv_getlength(bs->file); |
20d97356 BS |
1463 | nb_clusters = size_to_clusters(s, size); |
1464 | for(k = 0; k < nb_clusters;) { | |
1465 | k1 = k; | |
1466 | refcount = get_refcount(bs, k); | |
1467 | k++; | |
1468 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
1469 | k++; | |
0bfcd599 BS |
1470 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
1471 | k - k1); | |
20d97356 BS |
1472 | } |
1473 | } | |
1474 | #endif | |
1475 | ||
7c80ab3f JS |
1476 | static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1477 | int64_t pos, int size) | |
20d97356 BS |
1478 | { |
1479 | BDRVQcowState *s = bs->opaque; | |
1480 | int growable = bs->growable; | |
1481 | int ret; | |
1482 | ||
66f82cee | 1483 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 1484 | bs->growable = 1; |
7c80ab3f | 1485 | ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1486 | bs->growable = growable; |
1487 | ||
1488 | return ret; | |
1489 | } | |
1490 | ||
7c80ab3f JS |
1491 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1492 | int64_t pos, int size) | |
20d97356 BS |
1493 | { |
1494 | BDRVQcowState *s = bs->opaque; | |
1495 | int growable = bs->growable; | |
1496 | int ret; | |
1497 | ||
66f82cee | 1498 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 1499 | bs->growable = 1; |
7c80ab3f | 1500 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1501 | bs->growable = growable; |
1502 | ||
1503 | return ret; | |
1504 | } | |
1505 | ||
7c80ab3f | 1506 | static QEMUOptionParameter qcow2_create_options[] = { |
20d97356 BS |
1507 | { |
1508 | .name = BLOCK_OPT_SIZE, | |
1509 | .type = OPT_SIZE, | |
1510 | .help = "Virtual disk size" | |
1511 | }, | |
6744cbab KW |
1512 | { |
1513 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
1514 | .type = OPT_STRING, | |
1515 | .help = "Compatibility level (0.10 or 1.1)" | |
1516 | }, | |
20d97356 BS |
1517 | { |
1518 | .name = BLOCK_OPT_BACKING_FILE, | |
1519 | .type = OPT_STRING, | |
1520 | .help = "File name of a base image" | |
1521 | }, | |
1522 | { | |
1523 | .name = BLOCK_OPT_BACKING_FMT, | |
1524 | .type = OPT_STRING, | |
1525 | .help = "Image format of the base image" | |
1526 | }, | |
1527 | { | |
1528 | .name = BLOCK_OPT_ENCRYPT, | |
1529 | .type = OPT_FLAG, | |
1530 | .help = "Encrypt the image" | |
1531 | }, | |
1532 | { | |
1533 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
1534 | .type = OPT_SIZE, | |
99cce9fa KW |
1535 | .help = "qcow2 cluster size", |
1536 | .value = { .n = DEFAULT_CLUSTER_SIZE }, | |
20d97356 BS |
1537 | }, |
1538 | { | |
1539 | .name = BLOCK_OPT_PREALLOC, | |
1540 | .type = OPT_STRING, | |
1541 | .help = "Preallocation mode (allowed values: off, metadata)" | |
1542 | }, | |
1543 | { NULL } | |
1544 | }; | |
1545 | ||
1546 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
1547 | .format_name = "qcow2", |
1548 | .instance_size = sizeof(BDRVQcowState), | |
1549 | .bdrv_probe = qcow2_probe, | |
1550 | .bdrv_open = qcow2_open, | |
1551 | .bdrv_close = qcow2_close, | |
1552 | .bdrv_create = qcow2_create, | |
f8a2e5e3 | 1553 | .bdrv_co_is_allocated = qcow2_co_is_allocated, |
7c80ab3f JS |
1554 | .bdrv_set_key = qcow2_set_key, |
1555 | .bdrv_make_empty = qcow2_make_empty, | |
1556 | ||
c68b89ac KW |
1557 | .bdrv_co_readv = qcow2_co_readv, |
1558 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 1559 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 1560 | |
6db39ae2 | 1561 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 1562 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 1563 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
1564 | |
1565 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
1566 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
1567 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
1568 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
51ef6727 | 1569 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
7c80ab3f | 1570 | .bdrv_get_info = qcow2_get_info, |
20d97356 | 1571 | |
7c80ab3f JS |
1572 | .bdrv_save_vmstate = qcow2_save_vmstate, |
1573 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 BS |
1574 | |
1575 | .bdrv_change_backing_file = qcow2_change_backing_file, | |
1576 | ||
06d9260f AL |
1577 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
1578 | ||
7c80ab3f JS |
1579 | .create_options = qcow2_create_options, |
1580 | .bdrv_check = qcow2_check, | |
20d97356 BS |
1581 | }; |
1582 | ||
5efa9d5a AL |
1583 | static void bdrv_qcow2_init(void) |
1584 | { | |
1585 | bdrv_register(&bdrv_qcow2); | |
1586 | } | |
1587 | ||
1588 | block_init(bdrv_qcow2_init); |