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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 | |
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; |
29c1a730 | 223 | bool writethrough; |
585f8587 | 224 | |
6d85a57e JS |
225 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
226 | if (ret < 0) { | |
585f8587 | 227 | goto fail; |
6d85a57e | 228 | } |
585f8587 FB |
229 | be32_to_cpus(&header.magic); |
230 | be32_to_cpus(&header.version); | |
231 | be64_to_cpus(&header.backing_file_offset); | |
232 | be32_to_cpus(&header.backing_file_size); | |
233 | be64_to_cpus(&header.size); | |
234 | be32_to_cpus(&header.cluster_bits); | |
235 | be32_to_cpus(&header.crypt_method); | |
236 | be64_to_cpus(&header.l1_table_offset); | |
237 | be32_to_cpus(&header.l1_size); | |
238 | be64_to_cpus(&header.refcount_table_offset); | |
239 | be32_to_cpus(&header.refcount_table_clusters); | |
240 | be64_to_cpus(&header.snapshots_offset); | |
241 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 242 | |
e8cdcec1 | 243 | if (header.magic != QCOW_MAGIC) { |
6d85a57e | 244 | ret = -EINVAL; |
585f8587 | 245 | goto fail; |
6d85a57e | 246 | } |
6744cbab KW |
247 | if (header.version < 2 || header.version > 3) { |
248 | report_unsupported(bs, "QCOW version %d", header.version); | |
249 | ret = -ENOTSUP; | |
250 | goto fail; | |
251 | } | |
252 | ||
253 | s->qcow_version = header.version; | |
254 | ||
255 | /* Initialise version 3 header fields */ | |
256 | if (header.version == 2) { | |
257 | header.incompatible_features = 0; | |
258 | header.compatible_features = 0; | |
259 | header.autoclear_features = 0; | |
260 | header.refcount_order = 4; | |
261 | header.header_length = 72; | |
262 | } else { | |
263 | be64_to_cpus(&header.incompatible_features); | |
264 | be64_to_cpus(&header.compatible_features); | |
265 | be64_to_cpus(&header.autoclear_features); | |
266 | be32_to_cpus(&header.refcount_order); | |
267 | be32_to_cpus(&header.header_length); | |
268 | } | |
269 | ||
270 | if (header.header_length > sizeof(header)) { | |
271 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
272 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
273 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
274 | s->unknown_header_fields_size); | |
275 | if (ret < 0) { | |
276 | goto fail; | |
277 | } | |
278 | } | |
279 | ||
cfcc4c62 KW |
280 | if (header.backing_file_offset) { |
281 | ext_end = header.backing_file_offset; | |
282 | } else { | |
283 | ext_end = 1 << header.cluster_bits; | |
284 | } | |
285 | ||
6744cbab KW |
286 | /* Handle feature bits */ |
287 | s->incompatible_features = header.incompatible_features; | |
288 | s->compatible_features = header.compatible_features; | |
289 | s->autoclear_features = header.autoclear_features; | |
290 | ||
291 | if (s->incompatible_features != 0) { | |
cfcc4c62 KW |
292 | void *feature_table = NULL; |
293 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
294 | &feature_table); | |
295 | report_unsupported_feature(bs, feature_table, | |
296 | s->incompatible_features); | |
6744cbab KW |
297 | ret = -ENOTSUP; |
298 | goto fail; | |
299 | } | |
300 | ||
301 | if (!bs->read_only && s->autoclear_features != 0) { | |
302 | s->autoclear_features = 0; | |
c44bfe46 KW |
303 | ret = qcow2_update_header(bs); |
304 | if (ret < 0) { | |
305 | goto fail; | |
306 | } | |
6744cbab KW |
307 | } |
308 | ||
309 | /* Check support for various header values */ | |
310 | if (header.refcount_order != 4) { | |
311 | report_unsupported(bs, "%d bit reference counts", | |
312 | 1 << header.refcount_order); | |
e8cdcec1 KW |
313 | ret = -ENOTSUP; |
314 | goto fail; | |
315 | } | |
6744cbab | 316 | |
d191d12d | 317 | if (header.cluster_bits < MIN_CLUSTER_BITS || |
6d85a57e JS |
318 | header.cluster_bits > MAX_CLUSTER_BITS) { |
319 | ret = -EINVAL; | |
585f8587 | 320 | goto fail; |
6d85a57e JS |
321 | } |
322 | if (header.crypt_method > QCOW_CRYPT_AES) { | |
323 | ret = -EINVAL; | |
585f8587 | 324 | goto fail; |
6d85a57e | 325 | } |
585f8587 | 326 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 327 | if (s->crypt_method_header) { |
585f8587 | 328 | bs->encrypted = 1; |
6d85a57e | 329 | } |
585f8587 FB |
330 | s->cluster_bits = header.cluster_bits; |
331 | s->cluster_size = 1 << s->cluster_bits; | |
332 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
333 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ | |
334 | s->l2_size = 1 << s->l2_bits; | |
335 | bs->total_sectors = header.size / 512; | |
336 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
337 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
338 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
339 | s->refcount_table_offset = header.refcount_table_offset; | |
5fafdf24 | 340 | s->refcount_table_size = |
585f8587 FB |
341 | header.refcount_table_clusters << (s->cluster_bits - 3); |
342 | ||
343 | s->snapshots_offset = header.snapshots_offset; | |
344 | s->nb_snapshots = header.nb_snapshots; | |
345 | ||
346 | /* read the level 1 table */ | |
347 | s->l1_size = header.l1_size; | |
419b19d9 | 348 | s->l1_vm_state_index = size_to_l1(s, header.size); |
585f8587 FB |
349 | /* the L1 table must contain at least enough entries to put |
350 | header.size bytes */ | |
6d85a57e JS |
351 | if (s->l1_size < s->l1_vm_state_index) { |
352 | ret = -EINVAL; | |
585f8587 | 353 | goto fail; |
6d85a57e | 354 | } |
585f8587 | 355 | s->l1_table_offset = header.l1_table_offset; |
d191d12d | 356 | if (s->l1_size > 0) { |
7267c094 | 357 | s->l1_table = g_malloc0( |
d191d12d | 358 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
359 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
360 | s->l1_size * sizeof(uint64_t)); | |
361 | if (ret < 0) { | |
d191d12d | 362 | goto fail; |
6d85a57e | 363 | } |
d191d12d SW |
364 | for(i = 0;i < s->l1_size; i++) { |
365 | be64_to_cpus(&s->l1_table[i]); | |
366 | } | |
585f8587 | 367 | } |
29c1a730 KW |
368 | |
369 | /* alloc L2 table/refcount block cache */ | |
a6599793 | 370 | writethrough = ((flags & BDRV_O_CACHE_WB) == 0); |
29c1a730 KW |
371 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE, writethrough); |
372 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE, | |
373 | writethrough); | |
374 | ||
7267c094 | 375 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 376 | /* one more sector for decompressed data alignment */ |
dea43a65 | 377 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 378 | + 512); |
585f8587 | 379 | s->cluster_cache_offset = -1; |
06d9260f | 380 | s->flags = flags; |
3b46e624 | 381 | |
6d85a57e JS |
382 | ret = qcow2_refcount_init(bs); |
383 | if (ret != 0) { | |
585f8587 | 384 | goto fail; |
6d85a57e | 385 | } |
585f8587 | 386 | |
72cf2d4f | 387 | QLIST_INIT(&s->cluster_allocs); |
f214978a | 388 | |
9b80ddf3 | 389 | /* read qcow2 extensions */ |
cfcc4c62 | 390 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) { |
6d85a57e | 391 | ret = -EINVAL; |
9b80ddf3 | 392 | goto fail; |
6d85a57e | 393 | } |
9b80ddf3 | 394 | |
585f8587 FB |
395 | /* read the backing file name */ |
396 | if (header.backing_file_offset != 0) { | |
397 | len = header.backing_file_size; | |
6d85a57e | 398 | if (len > 1023) { |
585f8587 | 399 | len = 1023; |
6d85a57e JS |
400 | } |
401 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
402 | bs->backing_file, len); | |
403 | if (ret < 0) { | |
585f8587 | 404 | goto fail; |
6d85a57e | 405 | } |
585f8587 FB |
406 | bs->backing_file[len] = '\0'; |
407 | } | |
42deb29f KW |
408 | |
409 | ret = qcow2_read_snapshots(bs); | |
410 | if (ret < 0) { | |
585f8587 | 411 | goto fail; |
6d85a57e | 412 | } |
585f8587 | 413 | |
68d100e9 KW |
414 | /* Initialise locks */ |
415 | qemu_co_mutex_init(&s->lock); | |
416 | ||
585f8587 | 417 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
418 | { |
419 | BdrvCheckResult result = {0}; | |
420 | qcow2_check_refcounts(bs, &result); | |
421 | } | |
585f8587 | 422 | #endif |
6d85a57e | 423 | return ret; |
585f8587 FB |
424 | |
425 | fail: | |
6744cbab | 426 | g_free(s->unknown_header_fields); |
75bab85c | 427 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
428 | qcow2_free_snapshots(bs); |
429 | qcow2_refcount_close(bs); | |
7267c094 | 430 | g_free(s->l1_table); |
29c1a730 KW |
431 | if (s->l2_table_cache) { |
432 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
433 | } | |
7267c094 | 434 | g_free(s->cluster_cache); |
dea43a65 | 435 | qemu_vfree(s->cluster_data); |
6d85a57e | 436 | return ret; |
585f8587 FB |
437 | } |
438 | ||
7c80ab3f | 439 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
440 | { |
441 | BDRVQcowState *s = bs->opaque; | |
442 | uint8_t keybuf[16]; | |
443 | int len, i; | |
3b46e624 | 444 | |
585f8587 FB |
445 | memset(keybuf, 0, 16); |
446 | len = strlen(key); | |
447 | if (len > 16) | |
448 | len = 16; | |
449 | /* XXX: we could compress the chars to 7 bits to increase | |
450 | entropy */ | |
451 | for(i = 0;i < len;i++) { | |
452 | keybuf[i] = key[i]; | |
453 | } | |
454 | s->crypt_method = s->crypt_method_header; | |
455 | ||
456 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
457 | return -1; | |
458 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
459 | return -1; | |
460 | #if 0 | |
461 | /* test */ | |
462 | { | |
463 | uint8_t in[16]; | |
464 | uint8_t out[16]; | |
465 | uint8_t tmp[16]; | |
466 | for(i=0;i<16;i++) | |
467 | in[i] = i; | |
468 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
469 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
470 | for(i = 0; i < 16; i++) | |
471 | printf(" %02x", tmp[i]); | |
472 | printf("\n"); | |
473 | for(i = 0; i < 16; i++) | |
474 | printf(" %02x", out[i]); | |
475 | printf("\n"); | |
476 | } | |
477 | #endif | |
478 | return 0; | |
479 | } | |
480 | ||
f8a2e5e3 SH |
481 | static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs, |
482 | int64_t sector_num, int nb_sectors, int *pnum) | |
585f8587 | 483 | { |
f8a2e5e3 | 484 | BDRVQcowState *s = bs->opaque; |
585f8587 | 485 | uint64_t cluster_offset; |
1c46efaa | 486 | int ret; |
585f8587 | 487 | |
095a9c58 | 488 | *pnum = nb_sectors; |
f8a2e5e3 SH |
489 | /* FIXME We can get errors here, but the bdrv_co_is_allocated interface |
490 | * can't pass them on today */ | |
491 | qemu_co_mutex_lock(&s->lock); | |
1c46efaa | 492 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 493 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa KW |
494 | if (ret < 0) { |
495 | *pnum = 0; | |
496 | } | |
095a9c58 | 497 | |
585f8587 FB |
498 | return (cluster_offset != 0); |
499 | } | |
500 | ||
a9465922 | 501 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
502 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
503 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
504 | { |
505 | int n1; | |
506 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
507 | return nb_sectors; | |
508 | if (sector_num >= bs->total_sectors) | |
509 | n1 = 0; | |
510 | else | |
511 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 512 | |
e0d9c6f9 | 513 | qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1); |
bd28f835 | 514 | |
a9465922 FB |
515 | return n1; |
516 | } | |
517 | ||
a968168c | 518 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 519 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 520 | { |
585f8587 | 521 | BDRVQcowState *s = bs->opaque; |
a9465922 | 522 | int index_in_cluster, n1; |
68d100e9 | 523 | int ret; |
faf575c1 | 524 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 525 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
526 | uint64_t bytes_done = 0; |
527 | QEMUIOVector hd_qiov; | |
528 | uint8_t *cluster_data = NULL; | |
585f8587 | 529 | |
3fc48d09 FZ |
530 | qemu_iovec_init(&hd_qiov, qiov->niov); |
531 | ||
532 | qemu_co_mutex_lock(&s->lock); | |
533 | ||
534 | while (remaining_sectors != 0) { | |
bd28f835 | 535 | |
5ebaa27e | 536 | /* prepare next request */ |
3fc48d09 | 537 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
538 | if (s->crypt_method) { |
539 | cur_nr_sectors = MIN(cur_nr_sectors, | |
540 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 541 | } |
5ebaa27e | 542 | |
3fc48d09 | 543 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 544 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 545 | if (ret < 0) { |
3fc48d09 | 546 | goto fail; |
8af36488 | 547 | } |
bd28f835 | 548 | |
3fc48d09 | 549 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 550 | |
3fc48d09 FZ |
551 | qemu_iovec_reset(&hd_qiov); |
552 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e FZ |
553 | cur_nr_sectors * 512); |
554 | ||
68d000a3 KW |
555 | switch (ret) { |
556 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
557 | |
558 | if (bs->backing_hd) { | |
559 | /* read from the base image */ | |
3fc48d09 FZ |
560 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
561 | sector_num, cur_nr_sectors); | |
5ebaa27e FZ |
562 | if (n1 > 0) { |
563 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
564 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 FZ |
565 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
566 | n1, &hd_qiov); | |
5ebaa27e FZ |
567 | qemu_co_mutex_lock(&s->lock); |
568 | if (ret < 0) { | |
3fc48d09 | 569 | goto fail; |
5ebaa27e FZ |
570 | } |
571 | } | |
572 | } else { | |
573 | /* Note: in this case, no need to wait */ | |
3fc48d09 | 574 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); |
5ebaa27e | 575 | } |
68d000a3 KW |
576 | break; |
577 | ||
6377af48 KW |
578 | case QCOW2_CLUSTER_ZERO: |
579 | if (s->qcow_version < 3) { | |
580 | ret = -EIO; | |
581 | goto fail; | |
582 | } | |
583 | qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors); | |
584 | break; | |
585 | ||
68d000a3 | 586 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
587 | /* add AIO support for compressed blocks ? */ |
588 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
589 | if (ret < 0) { | |
3fc48d09 | 590 | goto fail; |
bd28f835 KW |
591 | } |
592 | ||
3fc48d09 | 593 | qemu_iovec_from_buffer(&hd_qiov, |
5ebaa27e | 594 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 595 | 512 * cur_nr_sectors); |
68d000a3 KW |
596 | break; |
597 | ||
598 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 599 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
600 | ret = -EIO; |
601 | goto fail; | |
5ebaa27e | 602 | } |
bd28f835 | 603 | |
5ebaa27e FZ |
604 | if (s->crypt_method) { |
605 | /* | |
606 | * For encrypted images, read everything into a temporary | |
607 | * contiguous buffer on which the AES functions can work. | |
608 | */ | |
3fc48d09 FZ |
609 | if (!cluster_data) { |
610 | cluster_data = | |
dea43a65 | 611 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
612 | } |
613 | ||
614 | assert(cur_nr_sectors <= | |
615 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
616 | qemu_iovec_reset(&hd_qiov); |
617 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
618 | 512 * cur_nr_sectors); |
619 | } | |
620 | ||
621 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
622 | qemu_co_mutex_unlock(&s->lock); | |
623 | ret = bdrv_co_readv(bs->file, | |
624 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 625 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
626 | qemu_co_mutex_lock(&s->lock); |
627 | if (ret < 0) { | |
3fc48d09 | 628 | goto fail; |
5ebaa27e FZ |
629 | } |
630 | if (s->crypt_method) { | |
3fc48d09 FZ |
631 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
632 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
633 | qemu_iovec_reset(&hd_qiov); | |
634 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 635 | cur_nr_sectors * 512); |
3fc48d09 | 636 | qemu_iovec_from_buffer(&hd_qiov, cluster_data, |
5ebaa27e FZ |
637 | 512 * cur_nr_sectors); |
638 | } | |
68d000a3 KW |
639 | break; |
640 | ||
641 | default: | |
642 | g_assert_not_reached(); | |
643 | ret = -EIO; | |
644 | goto fail; | |
faf575c1 | 645 | } |
f141eafe | 646 | |
3fc48d09 FZ |
647 | remaining_sectors -= cur_nr_sectors; |
648 | sector_num += cur_nr_sectors; | |
649 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 650 | } |
3fc48d09 | 651 | ret = 0; |
faf575c1 | 652 | |
3fc48d09 | 653 | fail: |
68d100e9 | 654 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 655 | |
3fc48d09 | 656 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 657 | qemu_vfree(cluster_data); |
68d100e9 KW |
658 | |
659 | return ret; | |
585f8587 FB |
660 | } |
661 | ||
68d100e9 | 662 | static void run_dependent_requests(BDRVQcowState *s, QCowL2Meta *m) |
f214978a | 663 | { |
f214978a KW |
664 | /* Take the request off the list of running requests */ |
665 | if (m->nb_clusters != 0) { | |
72cf2d4f | 666 | QLIST_REMOVE(m, next_in_flight); |
f214978a KW |
667 | } |
668 | ||
d4c146f0 | 669 | /* Restart all dependent requests */ |
68d100e9 KW |
670 | if (!qemu_co_queue_empty(&m->dependent_requests)) { |
671 | qemu_co_mutex_unlock(&s->lock); | |
e8ee5e4c | 672 | qemu_co_queue_restart_all(&m->dependent_requests); |
68d100e9 | 673 | qemu_co_mutex_lock(&s->lock); |
f214978a | 674 | } |
f214978a KW |
675 | } |
676 | ||
a968168c | 677 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
678 | int64_t sector_num, |
679 | int remaining_sectors, | |
680 | QEMUIOVector *qiov) | |
585f8587 | 681 | { |
585f8587 | 682 | BDRVQcowState *s = bs->opaque; |
585f8587 | 683 | int index_in_cluster; |
095a9c58 | 684 | int n_end; |
68d100e9 | 685 | int ret; |
faf575c1 | 686 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 687 | uint64_t cluster_offset; |
3fc48d09 FZ |
688 | QEMUIOVector hd_qiov; |
689 | uint64_t bytes_done = 0; | |
690 | uint8_t *cluster_data = NULL; | |
8e217d53 KW |
691 | QCowL2Meta l2meta = { |
692 | .nb_clusters = 0, | |
693 | }; | |
c2271403 | 694 | |
3cce16f4 KW |
695 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
696 | remaining_sectors); | |
697 | ||
c2271403 | 698 | qemu_co_queue_init(&l2meta.dependent_requests); |
585f8587 | 699 | |
3fc48d09 FZ |
700 | qemu_iovec_init(&hd_qiov, qiov->niov); |
701 | ||
702 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 703 | |
3fc48d09 FZ |
704 | qemu_co_mutex_lock(&s->lock); |
705 | ||
706 | while (remaining_sectors != 0) { | |
707 | ||
3cce16f4 | 708 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 FZ |
709 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
710 | n_end = index_in_cluster + remaining_sectors; | |
5ebaa27e FZ |
711 | if (s->crypt_method && |
712 | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { | |
713 | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; | |
714 | } | |
095a9c58 | 715 | |
3fc48d09 | 716 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
5ebaa27e FZ |
717 | index_in_cluster, n_end, &cur_nr_sectors, &l2meta); |
718 | if (ret < 0) { | |
3fc48d09 | 719 | goto fail; |
5ebaa27e | 720 | } |
148da7ea | 721 | |
5ebaa27e FZ |
722 | cluster_offset = l2meta.cluster_offset; |
723 | assert((cluster_offset & 511) == 0); | |
148da7ea | 724 | |
3fc48d09 FZ |
725 | qemu_iovec_reset(&hd_qiov); |
726 | qemu_iovec_copy(&hd_qiov, qiov, bytes_done, | |
5ebaa27e | 727 | cur_nr_sectors * 512); |
6f5f060b | 728 | |
5ebaa27e | 729 | if (s->crypt_method) { |
3fc48d09 | 730 | if (!cluster_data) { |
dea43a65 | 731 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
732 | s->cluster_size); |
733 | } | |
6f5f060b | 734 | |
3fc48d09 | 735 | assert(hd_qiov.size <= |
5ebaa27e | 736 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
3fc48d09 | 737 | qemu_iovec_to_buffer(&hd_qiov, cluster_data); |
6f5f060b | 738 | |
3fc48d09 FZ |
739 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
740 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 741 | |
3fc48d09 FZ |
742 | qemu_iovec_reset(&hd_qiov); |
743 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
744 | cur_nr_sectors * 512); |
745 | } | |
6f5f060b | 746 | |
5ebaa27e FZ |
747 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
748 | qemu_co_mutex_unlock(&s->lock); | |
3cce16f4 KW |
749 | trace_qcow2_writev_data(qemu_coroutine_self(), |
750 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
751 | ret = bdrv_co_writev(bs->file, |
752 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 753 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
754 | qemu_co_mutex_lock(&s->lock); |
755 | if (ret < 0) { | |
3fc48d09 | 756 | goto fail; |
5ebaa27e | 757 | } |
f141eafe | 758 | |
5ebaa27e | 759 | ret = qcow2_alloc_cluster_link_l2(bs, &l2meta); |
5ebaa27e | 760 | if (ret < 0) { |
3fc48d09 | 761 | goto fail; |
5ebaa27e | 762 | } |
faf575c1 | 763 | |
0fa9131a KW |
764 | run_dependent_requests(s, &l2meta); |
765 | ||
3fc48d09 FZ |
766 | remaining_sectors -= cur_nr_sectors; |
767 | sector_num += cur_nr_sectors; | |
768 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 769 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 770 | } |
3fc48d09 | 771 | ret = 0; |
faf575c1 | 772 | |
3fc48d09 | 773 | fail: |
0fa9131a KW |
774 | run_dependent_requests(s, &l2meta); |
775 | ||
68d100e9 | 776 | qemu_co_mutex_unlock(&s->lock); |
3b46e624 | 777 | |
3fc48d09 | 778 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 779 | qemu_vfree(cluster_data); |
3cce16f4 | 780 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 781 | |
68d100e9 | 782 | return ret; |
585f8587 FB |
783 | } |
784 | ||
7c80ab3f | 785 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
786 | { |
787 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 788 | g_free(s->l1_table); |
29c1a730 KW |
789 | |
790 | qcow2_cache_flush(bs, s->l2_table_cache); | |
791 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
792 | ||
793 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
794 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
795 | ||
6744cbab | 796 | g_free(s->unknown_header_fields); |
75bab85c | 797 | cleanup_unknown_header_ext(bs); |
6744cbab | 798 | |
7267c094 | 799 | g_free(s->cluster_cache); |
dea43a65 | 800 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 801 | qcow2_refcount_close(bs); |
28c1202b | 802 | qcow2_free_snapshots(bs); |
585f8587 FB |
803 | } |
804 | ||
06d9260f AL |
805 | static void qcow2_invalidate_cache(BlockDriverState *bs) |
806 | { | |
807 | BDRVQcowState *s = bs->opaque; | |
808 | int flags = s->flags; | |
809 | AES_KEY aes_encrypt_key; | |
810 | AES_KEY aes_decrypt_key; | |
811 | uint32_t crypt_method = 0; | |
812 | ||
813 | /* | |
814 | * Backing files are read-only which makes all of their metadata immutable, | |
815 | * that means we don't have to worry about reopening them here. | |
816 | */ | |
817 | ||
818 | if (s->crypt_method) { | |
819 | crypt_method = s->crypt_method; | |
820 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
821 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
822 | } | |
823 | ||
824 | qcow2_close(bs); | |
825 | ||
826 | memset(s, 0, sizeof(BDRVQcowState)); | |
827 | qcow2_open(bs, flags); | |
828 | ||
829 | if (crypt_method) { | |
830 | s->crypt_method = crypt_method; | |
831 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
832 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
833 | } | |
834 | } | |
835 | ||
e24e49e6 KW |
836 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
837 | size_t len, size_t buflen) | |
838 | { | |
839 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
840 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
841 | ||
842 | if (buflen < ext_len) { | |
843 | return -ENOSPC; | |
844 | } | |
845 | ||
846 | *ext_backing_fmt = (QCowExtension) { | |
847 | .magic = cpu_to_be32(magic), | |
848 | .len = cpu_to_be32(len), | |
849 | }; | |
850 | memcpy(buf + sizeof(QCowExtension), s, len); | |
851 | ||
852 | return ext_len; | |
853 | } | |
854 | ||
756e6736 | 855 | /* |
e24e49e6 KW |
856 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
857 | * the backing file name and all extensions. qcow2 was not designed to allow | |
858 | * such changes, so if we run out of space (we can only use the first cluster) | |
859 | * this function may fail. | |
756e6736 KW |
860 | * |
861 | * Returns 0 on success, -errno in error cases. | |
862 | */ | |
e24e49e6 | 863 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 864 | { |
756e6736 | 865 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
866 | QCowHeader *header; |
867 | char *buf; | |
868 | size_t buflen = s->cluster_size; | |
756e6736 | 869 | int ret; |
e24e49e6 KW |
870 | uint64_t total_size; |
871 | uint32_t refcount_table_clusters; | |
6744cbab | 872 | size_t header_length; |
75bab85c | 873 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 874 | |
e24e49e6 | 875 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 876 | |
e24e49e6 KW |
877 | /* Header structure */ |
878 | header = (QCowHeader*) buf; | |
756e6736 | 879 | |
e24e49e6 KW |
880 | if (buflen < sizeof(*header)) { |
881 | ret = -ENOSPC; | |
882 | goto fail; | |
756e6736 KW |
883 | } |
884 | ||
6744cbab | 885 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
886 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
887 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
888 | ||
889 | *header = (QCowHeader) { | |
6744cbab | 890 | /* Version 2 fields */ |
e24e49e6 | 891 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 892 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
893 | .backing_file_offset = 0, |
894 | .backing_file_size = 0, | |
895 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
896 | .size = cpu_to_be64(total_size), | |
897 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
898 | .l1_size = cpu_to_be32(s->l1_size), | |
899 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
900 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
901 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
902 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
903 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
904 | |
905 | /* Version 3 fields */ | |
906 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
907 | .compatible_features = cpu_to_be64(s->compatible_features), | |
908 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
909 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
910 | .header_length = cpu_to_be32(header_length), | |
e24e49e6 | 911 | }; |
756e6736 | 912 | |
6744cbab KW |
913 | /* For older versions, write a shorter header */ |
914 | switch (s->qcow_version) { | |
915 | case 2: | |
916 | ret = offsetof(QCowHeader, incompatible_features); | |
917 | break; | |
918 | case 3: | |
919 | ret = sizeof(*header); | |
920 | break; | |
921 | default: | |
b6c14762 JM |
922 | ret = -EINVAL; |
923 | goto fail; | |
6744cbab KW |
924 | } |
925 | ||
926 | buf += ret; | |
927 | buflen -= ret; | |
928 | memset(buf, 0, buflen); | |
929 | ||
930 | /* Preserve any unknown field in the header */ | |
931 | if (s->unknown_header_fields_size) { | |
932 | if (buflen < s->unknown_header_fields_size) { | |
933 | ret = -ENOSPC; | |
934 | goto fail; | |
935 | } | |
936 | ||
937 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
938 | buf += s->unknown_header_fields_size; | |
939 | buflen -= s->unknown_header_fields_size; | |
940 | } | |
756e6736 | 941 | |
e24e49e6 KW |
942 | /* Backing file format header extension */ |
943 | if (*bs->backing_format) { | |
944 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
945 | bs->backing_format, strlen(bs->backing_format), | |
946 | buflen); | |
947 | if (ret < 0) { | |
948 | goto fail; | |
756e6736 KW |
949 | } |
950 | ||
e24e49e6 KW |
951 | buf += ret; |
952 | buflen -= ret; | |
756e6736 KW |
953 | } |
954 | ||
cfcc4c62 KW |
955 | /* Feature table */ |
956 | Qcow2Feature features[] = { | |
957 | /* no feature defined yet */ | |
958 | }; | |
959 | ||
960 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
961 | features, sizeof(features), buflen); | |
962 | if (ret < 0) { | |
963 | goto fail; | |
964 | } | |
965 | buf += ret; | |
966 | buflen -= ret; | |
967 | ||
75bab85c KW |
968 | /* Keep unknown header extensions */ |
969 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
970 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
971 | if (ret < 0) { | |
972 | goto fail; | |
973 | } | |
974 | ||
975 | buf += ret; | |
976 | buflen -= ret; | |
977 | } | |
978 | ||
e24e49e6 KW |
979 | /* End of header extensions */ |
980 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
981 | if (ret < 0) { |
982 | goto fail; | |
983 | } | |
984 | ||
e24e49e6 KW |
985 | buf += ret; |
986 | buflen -= ret; | |
756e6736 | 987 | |
e24e49e6 KW |
988 | /* Backing file name */ |
989 | if (*bs->backing_file) { | |
990 | size_t backing_file_len = strlen(bs->backing_file); | |
991 | ||
992 | if (buflen < backing_file_len) { | |
993 | ret = -ENOSPC; | |
994 | goto fail; | |
995 | } | |
996 | ||
997 | strncpy(buf, bs->backing_file, buflen); | |
998 | ||
999 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
1000 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
1001 | } |
1002 | ||
e24e49e6 KW |
1003 | /* Write the new header */ |
1004 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1005 | if (ret < 0) { |
1006 | goto fail; | |
1007 | } | |
1008 | ||
1009 | ret = 0; | |
1010 | fail: | |
e24e49e6 | 1011 | qemu_vfree(header); |
756e6736 KW |
1012 | return ret; |
1013 | } | |
1014 | ||
1015 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1016 | const char *backing_file, const char *backing_fmt) | |
1017 | { | |
e24e49e6 KW |
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) { | |
15552c4a ZYW |
1194 | BDRVQcowState *s = bs->opaque; |
1195 | qemu_co_mutex_lock(&s->lock); | |
a9420734 | 1196 | ret = preallocate(bs); |
15552c4a | 1197 | qemu_co_mutex_unlock(&s->lock); |
a9420734 KW |
1198 | if (ret < 0) { |
1199 | goto out; | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | ret = 0; | |
1204 | out: | |
1205 | bdrv_delete(bs); | |
1206 | return ret; | |
1207 | } | |
de5f3f40 | 1208 | |
7c80ab3f | 1209 | static int qcow2_create(const char *filename, QEMUOptionParameter *options) |
de5f3f40 KW |
1210 | { |
1211 | const char *backing_file = NULL; | |
1212 | const char *backing_fmt = NULL; | |
1213 | uint64_t sectors = 0; | |
1214 | int flags = 0; | |
99cce9fa | 1215 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1216 | int prealloc = 0; |
6744cbab | 1217 | int version = 2; |
de5f3f40 KW |
1218 | |
1219 | /* Read out options */ | |
1220 | while (options && options->name) { | |
1221 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1222 | sectors = options->value.n / 512; | |
1223 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1224 | backing_file = options->value.s; | |
1225 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
1226 | backing_fmt = options->value.s; | |
1227 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
1228 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
1229 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { | |
1230 | if (options->value.n) { | |
1231 | cluster_size = options->value.n; | |
1232 | } | |
1233 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { | |
1234 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
1235 | prealloc = 0; | |
1236 | } else if (!strcmp(options->value.s, "metadata")) { | |
1237 | prealloc = 1; | |
1238 | } else { | |
1239 | fprintf(stderr, "Invalid preallocation mode: '%s'\n", | |
1240 | options->value.s); | |
1241 | return -EINVAL; | |
1242 | } | |
6744cbab KW |
1243 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
1244 | if (!options->value.s || !strcmp(options->value.s, "0.10")) { | |
1245 | version = 2; | |
1246 | } else if (!strcmp(options->value.s, "1.1")) { | |
1247 | version = 3; | |
1248 | } else { | |
1249 | fprintf(stderr, "Invalid compatibility level: '%s'\n", | |
1250 | options->value.s); | |
1251 | return -EINVAL; | |
1252 | } | |
de5f3f40 KW |
1253 | } |
1254 | options++; | |
1255 | } | |
1256 | ||
1257 | if (backing_file && prealloc) { | |
1258 | fprintf(stderr, "Backing file and preallocation cannot be used at " | |
1259 | "the same time\n"); | |
1260 | return -EINVAL; | |
1261 | } | |
1262 | ||
7c80ab3f | 1263 | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
6744cbab | 1264 | cluster_size, prealloc, options, version); |
de5f3f40 KW |
1265 | } |
1266 | ||
7c80ab3f | 1267 | static int qcow2_make_empty(BlockDriverState *bs) |
20d97356 BS |
1268 | { |
1269 | #if 0 | |
1270 | /* XXX: not correct */ | |
1271 | BDRVQcowState *s = bs->opaque; | |
1272 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
1273 | int ret; | |
1274 | ||
1275 | memset(s->l1_table, 0, l1_length); | |
66f82cee | 1276 | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) |
20d97356 | 1277 | return -1; |
66f82cee | 1278 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
20d97356 BS |
1279 | if (ret < 0) |
1280 | return ret; | |
1281 | ||
1282 | l2_cache_reset(bs); | |
1283 | #endif | |
1284 | return 0; | |
1285 | } | |
1286 | ||
621f0589 KW |
1287 | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
1288 | int64_t sector_num, int nb_sectors) | |
1289 | { | |
1290 | int ret; | |
1291 | BDRVQcowState *s = bs->opaque; | |
1292 | ||
1293 | /* Emulate misaligned zero writes */ | |
1294 | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { | |
1295 | return -ENOTSUP; | |
1296 | } | |
1297 | ||
1298 | /* Whatever is left can use real zero clusters */ | |
1299 | qemu_co_mutex_lock(&s->lock); | |
1300 | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
1301 | nb_sectors); | |
1302 | qemu_co_mutex_unlock(&s->lock); | |
1303 | ||
1304 | return ret; | |
1305 | } | |
1306 | ||
6db39ae2 PB |
1307 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1308 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1309 | { |
6db39ae2 PB |
1310 | int ret; |
1311 | BDRVQcowState *s = bs->opaque; | |
1312 | ||
1313 | qemu_co_mutex_lock(&s->lock); | |
1314 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
5ea929e3 | 1315 | nb_sectors); |
6db39ae2 PB |
1316 | qemu_co_mutex_unlock(&s->lock); |
1317 | return ret; | |
5ea929e3 KW |
1318 | } |
1319 | ||
419b19d9 SH |
1320 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1321 | { | |
1322 | BDRVQcowState *s = bs->opaque; | |
1323 | int ret, new_l1_size; | |
1324 | ||
1325 | if (offset & 511) { | |
259b2173 | 1326 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1327 | return -EINVAL; |
1328 | } | |
1329 | ||
1330 | /* cannot proceed if image has snapshots */ | |
1331 | if (s->nb_snapshots) { | |
259b2173 | 1332 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1333 | return -ENOTSUP; |
1334 | } | |
1335 | ||
1336 | /* shrinking is currently not supported */ | |
1337 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1338 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1339 | return -ENOTSUP; |
1340 | } | |
1341 | ||
1342 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1343 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1344 | if (ret < 0) { |
1345 | return ret; | |
1346 | } | |
1347 | ||
1348 | /* write updated header.size */ | |
1349 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1350 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1351 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1352 | if (ret < 0) { |
1353 | return ret; | |
1354 | } | |
1355 | ||
1356 | s->l1_vm_state_index = new_l1_size; | |
1357 | return 0; | |
1358 | } | |
1359 | ||
20d97356 BS |
1360 | /* XXX: put compressed sectors first, then all the cluster aligned |
1361 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1362 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1363 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1364 | { |
1365 | BDRVQcowState *s = bs->opaque; | |
1366 | z_stream strm; | |
1367 | int ret, out_len; | |
1368 | uint8_t *out_buf; | |
1369 | uint64_t cluster_offset; | |
1370 | ||
1371 | if (nb_sectors == 0) { | |
1372 | /* align end of file to a sector boundary to ease reading with | |
1373 | sector based I/Os */ | |
66f82cee | 1374 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1375 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1376 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1377 | return 0; |
1378 | } | |
1379 | ||
1380 | if (nb_sectors != s->cluster_sectors) | |
1381 | return -EINVAL; | |
1382 | ||
7267c094 | 1383 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1384 | |
1385 | /* best compression, small window, no zlib header */ | |
1386 | memset(&strm, 0, sizeof(strm)); | |
1387 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1388 | Z_DEFLATED, -12, | |
1389 | 9, Z_DEFAULT_STRATEGY); | |
1390 | if (ret != 0) { | |
8f1efd00 KW |
1391 | ret = -EINVAL; |
1392 | goto fail; | |
20d97356 BS |
1393 | } |
1394 | ||
1395 | strm.avail_in = s->cluster_size; | |
1396 | strm.next_in = (uint8_t *)buf; | |
1397 | strm.avail_out = s->cluster_size; | |
1398 | strm.next_out = out_buf; | |
1399 | ||
1400 | ret = deflate(&strm, Z_FINISH); | |
1401 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1402 | deflateEnd(&strm); |
8f1efd00 KW |
1403 | ret = -EINVAL; |
1404 | goto fail; | |
20d97356 BS |
1405 | } |
1406 | out_len = strm.next_out - out_buf; | |
1407 | ||
1408 | deflateEnd(&strm); | |
1409 | ||
1410 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1411 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
1412 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1413 | if (ret < 0) { | |
1414 | goto fail; | |
1415 | } | |
20d97356 BS |
1416 | } else { |
1417 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
1418 | sector_num << 9, out_len); | |
8f1efd00 KW |
1419 | if (!cluster_offset) { |
1420 | ret = -EIO; | |
1421 | goto fail; | |
1422 | } | |
20d97356 | 1423 | cluster_offset &= s->cluster_offset_mask; |
66f82cee | 1424 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
1425 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1426 | if (ret < 0) { | |
1427 | goto fail; | |
20d97356 BS |
1428 | } |
1429 | } | |
1430 | ||
8f1efd00 KW |
1431 | ret = 0; |
1432 | fail: | |
7267c094 | 1433 | g_free(out_buf); |
8f1efd00 | 1434 | return ret; |
20d97356 BS |
1435 | } |
1436 | ||
a968168c | 1437 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 1438 | { |
29c1a730 KW |
1439 | BDRVQcowState *s = bs->opaque; |
1440 | int ret; | |
1441 | ||
8b94ff85 | 1442 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
1443 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1444 | if (ret < 0) { | |
c95de7e2 | 1445 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1446 | return ret; |
29c1a730 KW |
1447 | } |
1448 | ||
1449 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1450 | if (ret < 0) { | |
c95de7e2 | 1451 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1452 | return ret; |
29c1a730 | 1453 | } |
8b94ff85 | 1454 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 1455 | |
eb489bb1 KW |
1456 | return 0; |
1457 | } | |
1458 | ||
7c80ab3f | 1459 | static int64_t qcow2_vm_state_offset(BDRVQcowState *s) |
20d97356 BS |
1460 | { |
1461 | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); | |
1462 | } | |
1463 | ||
7c80ab3f | 1464 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
1465 | { |
1466 | BDRVQcowState *s = bs->opaque; | |
1467 | bdi->cluster_size = s->cluster_size; | |
7c80ab3f | 1468 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
1469 | return 0; |
1470 | } | |
1471 | ||
1472 | ||
7c80ab3f | 1473 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result) |
20d97356 | 1474 | { |
9ac228e0 | 1475 | return qcow2_check_refcounts(bs, result); |
20d97356 BS |
1476 | } |
1477 | ||
1478 | #if 0 | |
1479 | static void dump_refcounts(BlockDriverState *bs) | |
1480 | { | |
1481 | BDRVQcowState *s = bs->opaque; | |
1482 | int64_t nb_clusters, k, k1, size; | |
1483 | int refcount; | |
1484 | ||
66f82cee | 1485 | size = bdrv_getlength(bs->file); |
20d97356 BS |
1486 | nb_clusters = size_to_clusters(s, size); |
1487 | for(k = 0; k < nb_clusters;) { | |
1488 | k1 = k; | |
1489 | refcount = get_refcount(bs, k); | |
1490 | k++; | |
1491 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
1492 | k++; | |
0bfcd599 BS |
1493 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
1494 | k - k1); | |
20d97356 BS |
1495 | } |
1496 | } | |
1497 | #endif | |
1498 | ||
7c80ab3f JS |
1499 | static int qcow2_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1500 | int64_t pos, int size) | |
20d97356 BS |
1501 | { |
1502 | BDRVQcowState *s = bs->opaque; | |
1503 | int growable = bs->growable; | |
1504 | int ret; | |
1505 | ||
66f82cee | 1506 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 1507 | bs->growable = 1; |
7c80ab3f | 1508 | ret = bdrv_pwrite(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1509 | bs->growable = growable; |
1510 | ||
1511 | return ret; | |
1512 | } | |
1513 | ||
7c80ab3f JS |
1514 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1515 | int64_t pos, int size) | |
20d97356 BS |
1516 | { |
1517 | BDRVQcowState *s = bs->opaque; | |
1518 | int growable = bs->growable; | |
1519 | int ret; | |
1520 | ||
66f82cee | 1521 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 1522 | bs->growable = 1; |
7c80ab3f | 1523 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1524 | bs->growable = growable; |
1525 | ||
1526 | return ret; | |
1527 | } | |
1528 | ||
7c80ab3f | 1529 | static QEMUOptionParameter qcow2_create_options[] = { |
20d97356 BS |
1530 | { |
1531 | .name = BLOCK_OPT_SIZE, | |
1532 | .type = OPT_SIZE, | |
1533 | .help = "Virtual disk size" | |
1534 | }, | |
6744cbab KW |
1535 | { |
1536 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
1537 | .type = OPT_STRING, | |
1538 | .help = "Compatibility level (0.10 or 1.1)" | |
1539 | }, | |
20d97356 BS |
1540 | { |
1541 | .name = BLOCK_OPT_BACKING_FILE, | |
1542 | .type = OPT_STRING, | |
1543 | .help = "File name of a base image" | |
1544 | }, | |
1545 | { | |
1546 | .name = BLOCK_OPT_BACKING_FMT, | |
1547 | .type = OPT_STRING, | |
1548 | .help = "Image format of the base image" | |
1549 | }, | |
1550 | { | |
1551 | .name = BLOCK_OPT_ENCRYPT, | |
1552 | .type = OPT_FLAG, | |
1553 | .help = "Encrypt the image" | |
1554 | }, | |
1555 | { | |
1556 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
1557 | .type = OPT_SIZE, | |
99cce9fa KW |
1558 | .help = "qcow2 cluster size", |
1559 | .value = { .n = DEFAULT_CLUSTER_SIZE }, | |
20d97356 BS |
1560 | }, |
1561 | { | |
1562 | .name = BLOCK_OPT_PREALLOC, | |
1563 | .type = OPT_STRING, | |
1564 | .help = "Preallocation mode (allowed values: off, metadata)" | |
1565 | }, | |
1566 | { NULL } | |
1567 | }; | |
1568 | ||
1569 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
1570 | .format_name = "qcow2", |
1571 | .instance_size = sizeof(BDRVQcowState), | |
1572 | .bdrv_probe = qcow2_probe, | |
1573 | .bdrv_open = qcow2_open, | |
1574 | .bdrv_close = qcow2_close, | |
1575 | .bdrv_create = qcow2_create, | |
f8a2e5e3 | 1576 | .bdrv_co_is_allocated = qcow2_co_is_allocated, |
7c80ab3f JS |
1577 | .bdrv_set_key = qcow2_set_key, |
1578 | .bdrv_make_empty = qcow2_make_empty, | |
1579 | ||
c68b89ac KW |
1580 | .bdrv_co_readv = qcow2_co_readv, |
1581 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 1582 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 1583 | |
621f0589 | 1584 | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
6db39ae2 | 1585 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 1586 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 1587 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
1588 | |
1589 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
1590 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
1591 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
1592 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
51ef6727 | 1593 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
7c80ab3f | 1594 | .bdrv_get_info = qcow2_get_info, |
20d97356 | 1595 | |
7c80ab3f JS |
1596 | .bdrv_save_vmstate = qcow2_save_vmstate, |
1597 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 BS |
1598 | |
1599 | .bdrv_change_backing_file = qcow2_change_backing_file, | |
1600 | ||
06d9260f AL |
1601 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
1602 | ||
7c80ab3f JS |
1603 | .create_options = qcow2_create_options, |
1604 | .bdrv_check = qcow2_check, | |
20d97356 BS |
1605 | }; |
1606 | ||
5efa9d5a AL |
1607 | static void bdrv_qcow2_init(void) |
1608 | { | |
1609 | bdrv_register(&bdrv_qcow2); | |
1610 | } | |
1611 | ||
1612 | block_init(bdrv_qcow2_init); |