1 /* 2 * Block driver for the QCOW version 2 format 3 * 4 * Copyright (c) 2004-2006 Fabrice Bellard 5 * 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 */ 24 25 #ifndef BLOCK_QCOW2_H 26 #define BLOCK_QCOW2_H 27 28 #include "qemu/aes.h" 29 #include "block/coroutine.h" 30 31 //#define DEBUG_ALLOC 32 //#define DEBUG_ALLOC2 33 //#define DEBUG_EXT 34 35 #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) 36 37 #define QCOW_CRYPT_NONE 0 38 #define QCOW_CRYPT_AES 1 39 40 #define QCOW_MAX_CRYPT_CLUSTERS 32 41 #define QCOW_MAX_SNAPSHOTS 65536 42 43 /* 8 MB refcount table is enough for 2 PB images at 64k cluster size 44 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ 45 #define QCOW_MAX_REFTABLE_SIZE 0x800000 46 47 /* 32 MB L1 table is enough for 2 PB images at 64k cluster size 48 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ 49 #define QCOW_MAX_L1_SIZE 0x2000000 50 51 /* Allow for an average of 1k per snapshot table entry, should be plenty of 52 * space for snapshot names and IDs */ 53 #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS) 54 55 /* indicate that the refcount of the referenced cluster is exactly one. */ 56 #define QCOW_OFLAG_COPIED (1ULL << 63) 57 /* indicate that the cluster is compressed (they never have the copied flag) */ 58 #define QCOW_OFLAG_COMPRESSED (1ULL << 62) 59 /* The cluster reads as all zeros */ 60 #define QCOW_OFLAG_ZERO (1ULL << 0) 61 62 #define MIN_CLUSTER_BITS 9 63 #define MAX_CLUSTER_BITS 21 64 65 /* Must be at least 2 to cover COW */ 66 #define MIN_L2_CACHE_SIZE 2 /* clusters */ 67 68 /* Must be at least 4 to cover all cases of refcount table growth */ 69 #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */ 70 71 /* Whichever is more */ 72 #define DEFAULT_L2_CACHE_CLUSTERS 8 /* clusters */ 73 #define DEFAULT_L2_CACHE_BYTE_SIZE 1048576 /* bytes */ 74 75 /* The refblock cache needs only a fourth of the L2 cache size to cover as many 76 * clusters */ 77 #define DEFAULT_L2_REFCOUNT_SIZE_RATIO 4 78 79 #define DEFAULT_CLUSTER_SIZE 65536 80 81 82 #define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts" 83 #define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request" 84 #define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot" 85 #define QCOW2_OPT_DISCARD_OTHER "pass-discard-other" 86 #define QCOW2_OPT_OVERLAP "overlap-check" 87 #define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template" 88 #define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header" 89 #define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1" 90 #define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2" 91 #define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table" 92 #define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block" 93 #define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table" 94 #define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1" 95 #define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2" 96 #define QCOW2_OPT_CACHE_SIZE "cache-size" 97 #define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size" 98 #define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size" 99 100 typedef struct QCowHeader { 101 uint32_t magic; 102 uint32_t version; 103 uint64_t backing_file_offset; 104 uint32_t backing_file_size; 105 uint32_t cluster_bits; 106 uint64_t size; /* in bytes */ 107 uint32_t crypt_method; 108 uint32_t l1_size; /* XXX: save number of clusters instead ? */ 109 uint64_t l1_table_offset; 110 uint64_t refcount_table_offset; 111 uint32_t refcount_table_clusters; 112 uint32_t nb_snapshots; 113 uint64_t snapshots_offset; 114 115 /* The following fields are only valid for version >= 3 */ 116 uint64_t incompatible_features; 117 uint64_t compatible_features; 118 uint64_t autoclear_features; 119 120 uint32_t refcount_order; 121 uint32_t header_length; 122 } QEMU_PACKED QCowHeader; 123 124 typedef struct QEMU_PACKED QCowSnapshotHeader { 125 /* header is 8 byte aligned */ 126 uint64_t l1_table_offset; 127 128 uint32_t l1_size; 129 uint16_t id_str_size; 130 uint16_t name_size; 131 132 uint32_t date_sec; 133 uint32_t date_nsec; 134 135 uint64_t vm_clock_nsec; 136 137 uint32_t vm_state_size; 138 uint32_t extra_data_size; /* for extension */ 139 /* extra data follows */ 140 /* id_str follows */ 141 /* name follows */ 142 } QCowSnapshotHeader; 143 144 typedef struct QEMU_PACKED QCowSnapshotExtraData { 145 uint64_t vm_state_size_large; 146 uint64_t disk_size; 147 } QCowSnapshotExtraData; 148 149 150 typedef struct QCowSnapshot { 151 uint64_t l1_table_offset; 152 uint32_t l1_size; 153 char *id_str; 154 char *name; 155 uint64_t disk_size; 156 uint64_t vm_state_size; 157 uint32_t date_sec; 158 uint32_t date_nsec; 159 uint64_t vm_clock_nsec; 160 } QCowSnapshot; 161 162 struct Qcow2Cache; 163 typedef struct Qcow2Cache Qcow2Cache; 164 165 typedef struct Qcow2UnknownHeaderExtension { 166 uint32_t magic; 167 uint32_t len; 168 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next; 169 uint8_t data[]; 170 } Qcow2UnknownHeaderExtension; 171 172 enum { 173 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0, 174 QCOW2_FEAT_TYPE_COMPATIBLE = 1, 175 QCOW2_FEAT_TYPE_AUTOCLEAR = 2, 176 }; 177 178 /* Incompatible feature bits */ 179 enum { 180 QCOW2_INCOMPAT_DIRTY_BITNR = 0, 181 QCOW2_INCOMPAT_CORRUPT_BITNR = 1, 182 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR, 183 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR, 184 185 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY 186 | QCOW2_INCOMPAT_CORRUPT, 187 }; 188 189 /* Compatible feature bits */ 190 enum { 191 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0, 192 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, 193 194 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS, 195 }; 196 197 enum qcow2_discard_type { 198 QCOW2_DISCARD_NEVER = 0, 199 QCOW2_DISCARD_ALWAYS, 200 QCOW2_DISCARD_REQUEST, 201 QCOW2_DISCARD_SNAPSHOT, 202 QCOW2_DISCARD_OTHER, 203 QCOW2_DISCARD_MAX 204 }; 205 206 typedef struct Qcow2Feature { 207 uint8_t type; 208 uint8_t bit; 209 char name[46]; 210 } QEMU_PACKED Qcow2Feature; 211 212 typedef struct Qcow2DiscardRegion { 213 BlockDriverState *bs; 214 uint64_t offset; 215 uint64_t bytes; 216 QTAILQ_ENTRY(Qcow2DiscardRegion) next; 217 } Qcow2DiscardRegion; 218 219 typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array, 220 uint64_t index); 221 typedef void Qcow2SetRefcountFunc(void *refcount_array, 222 uint64_t index, uint64_t value); 223 224 typedef struct BDRVQcowState { 225 int cluster_bits; 226 int cluster_size; 227 int cluster_sectors; 228 int l2_bits; 229 int l2_size; 230 int l1_size; 231 int l1_vm_state_index; 232 int refcount_block_bits; 233 int refcount_block_size; 234 int csize_shift; 235 int csize_mask; 236 uint64_t cluster_offset_mask; 237 uint64_t l1_table_offset; 238 uint64_t *l1_table; 239 240 Qcow2Cache* l2_table_cache; 241 Qcow2Cache* refcount_block_cache; 242 243 uint8_t *cluster_cache; 244 uint8_t *cluster_data; 245 uint64_t cluster_cache_offset; 246 QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs; 247 248 uint64_t *refcount_table; 249 uint64_t refcount_table_offset; 250 uint32_t refcount_table_size; 251 uint64_t free_cluster_index; 252 uint64_t free_byte_offset; 253 254 CoMutex lock; 255 256 uint32_t crypt_method; /* current crypt method, 0 if no key yet */ 257 uint32_t crypt_method_header; 258 AES_KEY aes_encrypt_key; 259 AES_KEY aes_decrypt_key; 260 uint64_t snapshots_offset; 261 int snapshots_size; 262 unsigned int nb_snapshots; 263 QCowSnapshot *snapshots; 264 265 int flags; 266 int qcow_version; 267 bool use_lazy_refcounts; 268 int refcount_order; 269 int refcount_bits; 270 uint64_t refcount_max; 271 272 Qcow2GetRefcountFunc *get_refcount; 273 Qcow2SetRefcountFunc *set_refcount; 274 275 bool discard_passthrough[QCOW2_DISCARD_MAX]; 276 277 int overlap_check; /* bitmask of Qcow2MetadataOverlap values */ 278 bool signaled_corruption; 279 280 uint64_t incompatible_features; 281 uint64_t compatible_features; 282 uint64_t autoclear_features; 283 284 size_t unknown_header_fields_size; 285 void* unknown_header_fields; 286 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext; 287 QTAILQ_HEAD (, Qcow2DiscardRegion) discards; 288 bool cache_discards; 289 290 /* Backing file path and format as stored in the image (this is not the 291 * effective path/format, which may be the result of a runtime option 292 * override) */ 293 char *image_backing_file; 294 char *image_backing_format; 295 } BDRVQcowState; 296 297 struct QCowAIOCB; 298 299 typedef struct Qcow2COWRegion { 300 /** 301 * Offset of the COW region in bytes from the start of the first cluster 302 * touched by the request. 303 */ 304 uint64_t offset; 305 306 /** Number of sectors to copy */ 307 int nb_sectors; 308 } Qcow2COWRegion; 309 310 /** 311 * Describes an in-flight (part of a) write request that writes to clusters 312 * that are not referenced in their L2 table yet. 313 */ 314 typedef struct QCowL2Meta 315 { 316 /** Guest offset of the first newly allocated cluster */ 317 uint64_t offset; 318 319 /** Host offset of the first newly allocated cluster */ 320 uint64_t alloc_offset; 321 322 /** 323 * Number of sectors from the start of the first allocated cluster to 324 * the end of the (possibly shortened) request 325 */ 326 int nb_available; 327 328 /** Number of newly allocated clusters */ 329 int nb_clusters; 330 331 /** 332 * Requests that overlap with this allocation and wait to be restarted 333 * when the allocating request has completed. 334 */ 335 CoQueue dependent_requests; 336 337 /** 338 * The COW Region between the start of the first allocated cluster and the 339 * area the guest actually writes to. 340 */ 341 Qcow2COWRegion cow_start; 342 343 /** 344 * The COW Region between the area the guest actually writes to and the 345 * end of the last allocated cluster. 346 */ 347 Qcow2COWRegion cow_end; 348 349 /** Pointer to next L2Meta of the same write request */ 350 struct QCowL2Meta *next; 351 352 QLIST_ENTRY(QCowL2Meta) next_in_flight; 353 } QCowL2Meta; 354 355 enum { 356 QCOW2_CLUSTER_UNALLOCATED, 357 QCOW2_CLUSTER_NORMAL, 358 QCOW2_CLUSTER_COMPRESSED, 359 QCOW2_CLUSTER_ZERO 360 }; 361 362 typedef enum QCow2MetadataOverlap { 363 QCOW2_OL_MAIN_HEADER_BITNR = 0, 364 QCOW2_OL_ACTIVE_L1_BITNR = 1, 365 QCOW2_OL_ACTIVE_L2_BITNR = 2, 366 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3, 367 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4, 368 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5, 369 QCOW2_OL_INACTIVE_L1_BITNR = 6, 370 QCOW2_OL_INACTIVE_L2_BITNR = 7, 371 372 QCOW2_OL_MAX_BITNR = 8, 373 374 QCOW2_OL_NONE = 0, 375 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR), 376 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR), 377 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR), 378 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR), 379 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR), 380 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR), 381 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR), 382 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv 383 * reads. */ 384 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR), 385 } QCow2MetadataOverlap; 386 387 /* Perform all overlap checks which can be done in constant time */ 388 #define QCOW2_OL_CONSTANT \ 389 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \ 390 QCOW2_OL_SNAPSHOT_TABLE) 391 392 /* Perform all overlap checks which don't require disk access */ 393 #define QCOW2_OL_CACHED \ 394 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \ 395 QCOW2_OL_INACTIVE_L1) 396 397 /* Perform all overlap checks */ 398 #define QCOW2_OL_ALL \ 399 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2) 400 401 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL 402 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL 403 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL 404 405 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL 406 407 static inline int64_t start_of_cluster(BDRVQcowState *s, int64_t offset) 408 { 409 return offset & ~(s->cluster_size - 1); 410 } 411 412 static inline int64_t offset_into_cluster(BDRVQcowState *s, int64_t offset) 413 { 414 return offset & (s->cluster_size - 1); 415 } 416 417 static inline int size_to_clusters(BDRVQcowState *s, int64_t size) 418 { 419 return (size + (s->cluster_size - 1)) >> s->cluster_bits; 420 } 421 422 static inline int64_t size_to_l1(BDRVQcowState *s, int64_t size) 423 { 424 int shift = s->cluster_bits + s->l2_bits; 425 return (size + (1ULL << shift) - 1) >> shift; 426 } 427 428 static inline int offset_to_l2_index(BDRVQcowState *s, int64_t offset) 429 { 430 return (offset >> s->cluster_bits) & (s->l2_size - 1); 431 } 432 433 static inline int64_t align_offset(int64_t offset, int n) 434 { 435 offset = (offset + n - 1) & ~(n - 1); 436 return offset; 437 } 438 439 static inline int64_t qcow2_vm_state_offset(BDRVQcowState *s) 440 { 441 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); 442 } 443 444 static inline uint64_t qcow2_max_refcount_clusters(BDRVQcowState *s) 445 { 446 return QCOW_MAX_REFTABLE_SIZE >> s->cluster_bits; 447 } 448 449 static inline int qcow2_get_cluster_type(uint64_t l2_entry) 450 { 451 if (l2_entry & QCOW_OFLAG_COMPRESSED) { 452 return QCOW2_CLUSTER_COMPRESSED; 453 } else if (l2_entry & QCOW_OFLAG_ZERO) { 454 return QCOW2_CLUSTER_ZERO; 455 } else if (!(l2_entry & L2E_OFFSET_MASK)) { 456 return QCOW2_CLUSTER_UNALLOCATED; 457 } else { 458 return QCOW2_CLUSTER_NORMAL; 459 } 460 } 461 462 /* Check whether refcounts are eager or lazy */ 463 static inline bool qcow2_need_accurate_refcounts(BDRVQcowState *s) 464 { 465 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY); 466 } 467 468 static inline uint64_t l2meta_cow_start(QCowL2Meta *m) 469 { 470 return m->offset + m->cow_start.offset; 471 } 472 473 static inline uint64_t l2meta_cow_end(QCowL2Meta *m) 474 { 475 return m->offset + m->cow_end.offset 476 + (m->cow_end.nb_sectors << BDRV_SECTOR_BITS); 477 } 478 479 static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2) 480 { 481 return r1 > r2 ? r1 - r2 : r2 - r1; 482 } 483 484 // FIXME Need qcow2_ prefix to global functions 485 486 /* qcow2.c functions */ 487 int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, 488 int64_t sector_num, int nb_sectors); 489 490 int qcow2_mark_dirty(BlockDriverState *bs); 491 int qcow2_mark_corrupt(BlockDriverState *bs); 492 int qcow2_mark_consistent(BlockDriverState *bs); 493 int qcow2_update_header(BlockDriverState *bs); 494 495 void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, 496 int64_t size, const char *message_format, ...) 497 GCC_FMT_ATTR(5, 6); 498 499 /* qcow2-refcount.c functions */ 500 int qcow2_refcount_init(BlockDriverState *bs); 501 void qcow2_refcount_close(BlockDriverState *bs); 502 503 int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index, 504 uint64_t *refcount); 505 506 int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index, 507 uint64_t addend, bool decrease, 508 enum qcow2_discard_type type); 509 510 int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size); 511 int qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset, 512 int nb_clusters); 513 int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size); 514 void qcow2_free_clusters(BlockDriverState *bs, 515 int64_t offset, int64_t size, 516 enum qcow2_discard_type type); 517 void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry, 518 int nb_clusters, enum qcow2_discard_type type); 519 520 int qcow2_update_snapshot_refcount(BlockDriverState *bs, 521 int64_t l1_table_offset, int l1_size, int addend); 522 523 int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res, 524 BdrvCheckMode fix); 525 526 void qcow2_process_discards(BlockDriverState *bs, int ret); 527 528 int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset, 529 int64_t size); 530 int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset, 531 int64_t size); 532 533 /* qcow2-cluster.c functions */ 534 int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size, 535 bool exact_size); 536 int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index); 537 void qcow2_l2_cache_reset(BlockDriverState *bs); 538 int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); 539 void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num, 540 uint8_t *out_buf, const uint8_t *in_buf, 541 int nb_sectors, int enc, 542 const AES_KEY *key); 543 544 int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, 545 int *num, uint64_t *cluster_offset); 546 int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, 547 int *num, uint64_t *host_offset, QCowL2Meta **m); 548 uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs, 549 uint64_t offset, 550 int compressed_size); 551 552 int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m); 553 int qcow2_discard_clusters(BlockDriverState *bs, uint64_t offset, 554 int nb_sectors, enum qcow2_discard_type type, bool full_discard); 555 int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors); 556 557 int qcow2_expand_zero_clusters(BlockDriverState *bs, 558 BlockDriverAmendStatusCB *status_cb); 559 560 /* qcow2-snapshot.c functions */ 561 int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info); 562 int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id); 563 int qcow2_snapshot_delete(BlockDriverState *bs, 564 const char *snapshot_id, 565 const char *name, 566 Error **errp); 567 int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab); 568 int qcow2_snapshot_load_tmp(BlockDriverState *bs, 569 const char *snapshot_id, 570 const char *name, 571 Error **errp); 572 573 void qcow2_free_snapshots(BlockDriverState *bs); 574 int qcow2_read_snapshots(BlockDriverState *bs); 575 576 /* qcow2-cache.c functions */ 577 Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables); 578 int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c); 579 580 void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c, 581 void *table); 582 int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c); 583 int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c, 584 Qcow2Cache *dependency); 585 void qcow2_cache_depends_on_flush(Qcow2Cache *c); 586 587 int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c); 588 589 int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, 590 void **table); 591 int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, 592 void **table); 593 void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table); 594 595 #endif 596