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 "crypto/block.h" 29 #include "qemu/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 #define QCOW_CRYPT_LUKS 2 40 41 #define QCOW_MAX_CRYPT_CLUSTERS 32 42 #define QCOW_MAX_SNAPSHOTS 65536 43 44 /* 8 MB refcount table is enough for 2 PB images at 64k cluster size 45 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ 46 #define QCOW_MAX_REFTABLE_SIZE 0x800000 47 48 /* 32 MB L1 table is enough for 2 PB images at 64k cluster size 49 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ 50 #define QCOW_MAX_L1_SIZE 0x2000000 51 52 /* Allow for an average of 1k per snapshot table entry, should be plenty of 53 * space for snapshot names and IDs */ 54 #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS) 55 56 /* Bitmap header extension constraints */ 57 #define QCOW2_MAX_BITMAPS 65535 58 #define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS) 59 60 /* indicate that the refcount of the referenced cluster is exactly one. */ 61 #define QCOW_OFLAG_COPIED (1ULL << 63) 62 /* indicate that the cluster is compressed (they never have the copied flag) */ 63 #define QCOW_OFLAG_COMPRESSED (1ULL << 62) 64 /* The cluster reads as all zeros */ 65 #define QCOW_OFLAG_ZERO (1ULL << 0) 66 67 #define MIN_CLUSTER_BITS 9 68 #define MAX_CLUSTER_BITS 21 69 70 /* Must be at least 2 to cover COW */ 71 #define MIN_L2_CACHE_SIZE 2 /* clusters */ 72 73 /* Must be at least 4 to cover all cases of refcount table growth */ 74 #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */ 75 76 /* Whichever is more */ 77 #define DEFAULT_L2_CACHE_CLUSTERS 8 /* clusters */ 78 #define DEFAULT_L2_CACHE_BYTE_SIZE 1048576 /* bytes */ 79 80 /* The refblock cache needs only a fourth of the L2 cache size to cover as many 81 * clusters */ 82 #define DEFAULT_L2_REFCOUNT_SIZE_RATIO 4 83 84 #define DEFAULT_CLUSTER_SIZE 65536 85 86 87 #define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts" 88 #define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request" 89 #define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot" 90 #define QCOW2_OPT_DISCARD_OTHER "pass-discard-other" 91 #define QCOW2_OPT_OVERLAP "overlap-check" 92 #define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template" 93 #define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header" 94 #define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1" 95 #define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2" 96 #define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table" 97 #define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block" 98 #define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table" 99 #define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1" 100 #define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2" 101 #define QCOW2_OPT_CACHE_SIZE "cache-size" 102 #define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size" 103 #define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size" 104 #define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval" 105 106 typedef struct QCowHeader { 107 uint32_t magic; 108 uint32_t version; 109 uint64_t backing_file_offset; 110 uint32_t backing_file_size; 111 uint32_t cluster_bits; 112 uint64_t size; /* in bytes */ 113 uint32_t crypt_method; 114 uint32_t l1_size; /* XXX: save number of clusters instead ? */ 115 uint64_t l1_table_offset; 116 uint64_t refcount_table_offset; 117 uint32_t refcount_table_clusters; 118 uint32_t nb_snapshots; 119 uint64_t snapshots_offset; 120 121 /* The following fields are only valid for version >= 3 */ 122 uint64_t incompatible_features; 123 uint64_t compatible_features; 124 uint64_t autoclear_features; 125 126 uint32_t refcount_order; 127 uint32_t header_length; 128 } QEMU_PACKED QCowHeader; 129 130 typedef struct QEMU_PACKED QCowSnapshotHeader { 131 /* header is 8 byte aligned */ 132 uint64_t l1_table_offset; 133 134 uint32_t l1_size; 135 uint16_t id_str_size; 136 uint16_t name_size; 137 138 uint32_t date_sec; 139 uint32_t date_nsec; 140 141 uint64_t vm_clock_nsec; 142 143 uint32_t vm_state_size; 144 uint32_t extra_data_size; /* for extension */ 145 /* extra data follows */ 146 /* id_str follows */ 147 /* name follows */ 148 } QCowSnapshotHeader; 149 150 typedef struct QEMU_PACKED QCowSnapshotExtraData { 151 uint64_t vm_state_size_large; 152 uint64_t disk_size; 153 } QCowSnapshotExtraData; 154 155 156 typedef struct QCowSnapshot { 157 uint64_t l1_table_offset; 158 uint32_t l1_size; 159 char *id_str; 160 char *name; 161 uint64_t disk_size; 162 uint64_t vm_state_size; 163 uint32_t date_sec; 164 uint32_t date_nsec; 165 uint64_t vm_clock_nsec; 166 } QCowSnapshot; 167 168 struct Qcow2Cache; 169 typedef struct Qcow2Cache Qcow2Cache; 170 171 typedef struct Qcow2CryptoHeaderExtension { 172 uint64_t offset; 173 uint64_t length; 174 } QEMU_PACKED Qcow2CryptoHeaderExtension; 175 176 typedef struct Qcow2UnknownHeaderExtension { 177 uint32_t magic; 178 uint32_t len; 179 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next; 180 uint8_t data[]; 181 } Qcow2UnknownHeaderExtension; 182 183 enum { 184 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0, 185 QCOW2_FEAT_TYPE_COMPATIBLE = 1, 186 QCOW2_FEAT_TYPE_AUTOCLEAR = 2, 187 }; 188 189 /* Incompatible feature bits */ 190 enum { 191 QCOW2_INCOMPAT_DIRTY_BITNR = 0, 192 QCOW2_INCOMPAT_CORRUPT_BITNR = 1, 193 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR, 194 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR, 195 196 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY 197 | QCOW2_INCOMPAT_CORRUPT, 198 }; 199 200 /* Compatible feature bits */ 201 enum { 202 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0, 203 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, 204 205 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS, 206 }; 207 208 /* Autoclear feature bits */ 209 enum { 210 QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0, 211 QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR, 212 213 QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS, 214 }; 215 216 enum qcow2_discard_type { 217 QCOW2_DISCARD_NEVER = 0, 218 QCOW2_DISCARD_ALWAYS, 219 QCOW2_DISCARD_REQUEST, 220 QCOW2_DISCARD_SNAPSHOT, 221 QCOW2_DISCARD_OTHER, 222 QCOW2_DISCARD_MAX 223 }; 224 225 typedef struct Qcow2Feature { 226 uint8_t type; 227 uint8_t bit; 228 char name[46]; 229 } QEMU_PACKED Qcow2Feature; 230 231 typedef struct Qcow2DiscardRegion { 232 BlockDriverState *bs; 233 uint64_t offset; 234 uint64_t bytes; 235 QTAILQ_ENTRY(Qcow2DiscardRegion) next; 236 } Qcow2DiscardRegion; 237 238 typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array, 239 uint64_t index); 240 typedef void Qcow2SetRefcountFunc(void *refcount_array, 241 uint64_t index, uint64_t value); 242 243 typedef struct Qcow2BitmapHeaderExt { 244 uint32_t nb_bitmaps; 245 uint32_t reserved32; 246 uint64_t bitmap_directory_size; 247 uint64_t bitmap_directory_offset; 248 } QEMU_PACKED Qcow2BitmapHeaderExt; 249 250 typedef struct BDRVQcow2State { 251 int cluster_bits; 252 int cluster_size; 253 int cluster_sectors; 254 int l2_bits; 255 int l2_size; 256 int l1_size; 257 int l1_vm_state_index; 258 int refcount_block_bits; 259 int refcount_block_size; 260 int csize_shift; 261 int csize_mask; 262 uint64_t cluster_offset_mask; 263 uint64_t l1_table_offset; 264 uint64_t *l1_table; 265 266 Qcow2Cache* l2_table_cache; 267 Qcow2Cache* refcount_block_cache; 268 QEMUTimer *cache_clean_timer; 269 unsigned cache_clean_interval; 270 271 uint8_t *cluster_cache; 272 uint8_t *cluster_data; 273 uint64_t cluster_cache_offset; 274 QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs; 275 276 uint64_t *refcount_table; 277 uint64_t refcount_table_offset; 278 uint32_t refcount_table_size; 279 uint32_t max_refcount_table_index; /* Last used entry in refcount_table */ 280 uint64_t free_cluster_index; 281 uint64_t free_byte_offset; 282 283 CoMutex lock; 284 285 Qcow2CryptoHeaderExtension crypto_header; /* QCow2 header extension */ 286 QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */ 287 QCryptoBlock *crypto; /* Disk encryption format driver */ 288 bool crypt_physical_offset; /* Whether to use virtual or physical offset 289 for encryption initialization vector tweak */ 290 uint32_t crypt_method_header; 291 uint64_t snapshots_offset; 292 int snapshots_size; 293 unsigned int nb_snapshots; 294 QCowSnapshot *snapshots; 295 296 uint32_t nb_bitmaps; 297 uint64_t bitmap_directory_size; 298 uint64_t bitmap_directory_offset; 299 300 int flags; 301 int qcow_version; 302 bool use_lazy_refcounts; 303 int refcount_order; 304 int refcount_bits; 305 uint64_t refcount_max; 306 307 Qcow2GetRefcountFunc *get_refcount; 308 Qcow2SetRefcountFunc *set_refcount; 309 310 bool discard_passthrough[QCOW2_DISCARD_MAX]; 311 312 int overlap_check; /* bitmask of Qcow2MetadataOverlap values */ 313 bool signaled_corruption; 314 315 uint64_t incompatible_features; 316 uint64_t compatible_features; 317 uint64_t autoclear_features; 318 319 size_t unknown_header_fields_size; 320 void* unknown_header_fields; 321 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext; 322 QTAILQ_HEAD (, Qcow2DiscardRegion) discards; 323 bool cache_discards; 324 325 /* Backing file path and format as stored in the image (this is not the 326 * effective path/format, which may be the result of a runtime option 327 * override) */ 328 char *image_backing_file; 329 char *image_backing_format; 330 } BDRVQcow2State; 331 332 typedef struct Qcow2COWRegion { 333 /** 334 * Offset of the COW region in bytes from the start of the first cluster 335 * touched by the request. 336 */ 337 unsigned offset; 338 339 /** Number of bytes to copy */ 340 unsigned nb_bytes; 341 } Qcow2COWRegion; 342 343 /** 344 * Describes an in-flight (part of a) write request that writes to clusters 345 * that are not referenced in their L2 table yet. 346 */ 347 typedef struct QCowL2Meta 348 { 349 /** Guest offset of the first newly allocated cluster */ 350 uint64_t offset; 351 352 /** Host offset of the first newly allocated cluster */ 353 uint64_t alloc_offset; 354 355 /** Number of newly allocated clusters */ 356 int nb_clusters; 357 358 /** Do not free the old clusters */ 359 bool keep_old_clusters; 360 361 /** 362 * Requests that overlap with this allocation and wait to be restarted 363 * when the allocating request has completed. 364 */ 365 CoQueue dependent_requests; 366 367 /** 368 * The COW Region between the start of the first allocated cluster and the 369 * area the guest actually writes to. 370 */ 371 Qcow2COWRegion cow_start; 372 373 /** 374 * The COW Region between the area the guest actually writes to and the 375 * end of the last allocated cluster. 376 */ 377 Qcow2COWRegion cow_end; 378 379 /** 380 * The I/O vector with the data from the actual guest write request. 381 * If non-NULL, this is meant to be merged together with the data 382 * from @cow_start and @cow_end into one single write operation. 383 */ 384 QEMUIOVector *data_qiov; 385 386 /** Pointer to next L2Meta of the same write request */ 387 struct QCowL2Meta *next; 388 389 QLIST_ENTRY(QCowL2Meta) next_in_flight; 390 } QCowL2Meta; 391 392 typedef enum QCow2ClusterType { 393 QCOW2_CLUSTER_UNALLOCATED, 394 QCOW2_CLUSTER_ZERO_PLAIN, 395 QCOW2_CLUSTER_ZERO_ALLOC, 396 QCOW2_CLUSTER_NORMAL, 397 QCOW2_CLUSTER_COMPRESSED, 398 } QCow2ClusterType; 399 400 typedef enum QCow2MetadataOverlap { 401 QCOW2_OL_MAIN_HEADER_BITNR = 0, 402 QCOW2_OL_ACTIVE_L1_BITNR = 1, 403 QCOW2_OL_ACTIVE_L2_BITNR = 2, 404 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3, 405 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4, 406 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5, 407 QCOW2_OL_INACTIVE_L1_BITNR = 6, 408 QCOW2_OL_INACTIVE_L2_BITNR = 7, 409 410 QCOW2_OL_MAX_BITNR = 8, 411 412 QCOW2_OL_NONE = 0, 413 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR), 414 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR), 415 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR), 416 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR), 417 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR), 418 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR), 419 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR), 420 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv 421 * reads. */ 422 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR), 423 } QCow2MetadataOverlap; 424 425 /* Perform all overlap checks which can be done in constant time */ 426 #define QCOW2_OL_CONSTANT \ 427 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \ 428 QCOW2_OL_SNAPSHOT_TABLE) 429 430 /* Perform all overlap checks which don't require disk access */ 431 #define QCOW2_OL_CACHED \ 432 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \ 433 QCOW2_OL_INACTIVE_L1) 434 435 /* Perform all overlap checks */ 436 #define QCOW2_OL_ALL \ 437 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2) 438 439 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL 440 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL 441 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL 442 443 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL 444 445 static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset) 446 { 447 return offset & ~(s->cluster_size - 1); 448 } 449 450 static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset) 451 { 452 return offset & (s->cluster_size - 1); 453 } 454 455 static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size) 456 { 457 return (size + (s->cluster_size - 1)) >> s->cluster_bits; 458 } 459 460 static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size) 461 { 462 int shift = s->cluster_bits + s->l2_bits; 463 return (size + (1ULL << shift) - 1) >> shift; 464 } 465 466 static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset) 467 { 468 return (offset >> s->cluster_bits) & (s->l2_size - 1); 469 } 470 471 static inline int64_t align_offset(int64_t offset, int n) 472 { 473 offset = (offset + n - 1) & ~(n - 1); 474 return offset; 475 } 476 477 static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s) 478 { 479 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); 480 } 481 482 static inline uint64_t qcow2_max_refcount_clusters(BDRVQcow2State *s) 483 { 484 return QCOW_MAX_REFTABLE_SIZE >> s->cluster_bits; 485 } 486 487 static inline QCow2ClusterType qcow2_get_cluster_type(uint64_t l2_entry) 488 { 489 if (l2_entry & QCOW_OFLAG_COMPRESSED) { 490 return QCOW2_CLUSTER_COMPRESSED; 491 } else if (l2_entry & QCOW_OFLAG_ZERO) { 492 if (l2_entry & L2E_OFFSET_MASK) { 493 return QCOW2_CLUSTER_ZERO_ALLOC; 494 } 495 return QCOW2_CLUSTER_ZERO_PLAIN; 496 } else if (!(l2_entry & L2E_OFFSET_MASK)) { 497 return QCOW2_CLUSTER_UNALLOCATED; 498 } else { 499 return QCOW2_CLUSTER_NORMAL; 500 } 501 } 502 503 /* Check whether refcounts are eager or lazy */ 504 static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s) 505 { 506 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY); 507 } 508 509 static inline uint64_t l2meta_cow_start(QCowL2Meta *m) 510 { 511 return m->offset + m->cow_start.offset; 512 } 513 514 static inline uint64_t l2meta_cow_end(QCowL2Meta *m) 515 { 516 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes; 517 } 518 519 static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2) 520 { 521 return r1 > r2 ? r1 - r2 : r2 - r1; 522 } 523 524 /* qcow2.c functions */ 525 int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, 526 int64_t sector_num, int nb_sectors); 527 528 int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size, 529 int refcount_order, bool generous_increase, 530 uint64_t *refblock_count); 531 532 int qcow2_mark_dirty(BlockDriverState *bs); 533 int qcow2_mark_corrupt(BlockDriverState *bs); 534 int qcow2_mark_consistent(BlockDriverState *bs); 535 int qcow2_update_header(BlockDriverState *bs); 536 537 void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, 538 int64_t size, const char *message_format, ...) 539 GCC_FMT_ATTR(5, 6); 540 541 /* qcow2-refcount.c functions */ 542 int qcow2_refcount_init(BlockDriverState *bs); 543 void qcow2_refcount_close(BlockDriverState *bs); 544 545 int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index, 546 uint64_t *refcount); 547 548 int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index, 549 uint64_t addend, bool decrease, 550 enum qcow2_discard_type type); 551 552 int64_t qcow2_refcount_area(BlockDriverState *bs, uint64_t offset, 553 uint64_t additional_clusters, bool exact_size, 554 int new_refblock_index, 555 uint64_t new_refblock_offset); 556 557 int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size); 558 int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset, 559 int64_t nb_clusters); 560 int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size); 561 void qcow2_free_clusters(BlockDriverState *bs, 562 int64_t offset, int64_t size, 563 enum qcow2_discard_type type); 564 void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry, 565 int nb_clusters, enum qcow2_discard_type type); 566 567 int qcow2_update_snapshot_refcount(BlockDriverState *bs, 568 int64_t l1_table_offset, int l1_size, int addend); 569 570 int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res, 571 BdrvCheckMode fix); 572 573 void qcow2_process_discards(BlockDriverState *bs, int ret); 574 575 int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset, 576 int64_t size); 577 int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset, 578 int64_t size); 579 int qcow2_inc_refcounts_imrt(BlockDriverState *bs, BdrvCheckResult *res, 580 void **refcount_table, 581 int64_t *refcount_table_size, 582 int64_t offset, int64_t size); 583 584 int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order, 585 BlockDriverAmendStatusCB *status_cb, 586 void *cb_opaque, Error **errp); 587 588 /* qcow2-cluster.c functions */ 589 int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size, 590 bool exact_size); 591 int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index); 592 int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); 593 int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num, 594 uint8_t *buf, int nb_sectors, bool enc, Error **errp); 595 596 int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, 597 unsigned int *bytes, uint64_t *cluster_offset); 598 int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, 599 unsigned int *bytes, uint64_t *host_offset, 600 QCowL2Meta **m); 601 uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs, 602 uint64_t offset, 603 int compressed_size); 604 605 int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m); 606 int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset, 607 uint64_t bytes, enum qcow2_discard_type type, 608 bool full_discard); 609 int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset, 610 uint64_t bytes, int flags); 611 612 int qcow2_expand_zero_clusters(BlockDriverState *bs, 613 BlockDriverAmendStatusCB *status_cb, 614 void *cb_opaque); 615 616 /* qcow2-snapshot.c functions */ 617 int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info); 618 int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id); 619 int qcow2_snapshot_delete(BlockDriverState *bs, 620 const char *snapshot_id, 621 const char *name, 622 Error **errp); 623 int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab); 624 int qcow2_snapshot_load_tmp(BlockDriverState *bs, 625 const char *snapshot_id, 626 const char *name, 627 Error **errp); 628 629 void qcow2_free_snapshots(BlockDriverState *bs); 630 int qcow2_read_snapshots(BlockDriverState *bs); 631 632 /* qcow2-cache.c functions */ 633 Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables); 634 int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c); 635 636 void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c, 637 void *table); 638 int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c); 639 int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c); 640 int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c, 641 Qcow2Cache *dependency); 642 void qcow2_cache_depends_on_flush(Qcow2Cache *c); 643 644 void qcow2_cache_clean_unused(BlockDriverState *bs, Qcow2Cache *c); 645 int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c); 646 647 int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, 648 void **table); 649 int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, 650 void **table); 651 void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table); 652 653 /* qcow2-bitmap.c functions */ 654 int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res, 655 void **refcount_table, 656 int64_t *refcount_table_size); 657 bool qcow2_load_autoloading_dirty_bitmaps(BlockDriverState *bs, Error **errp); 658 int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp); 659 void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp); 660 int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp); 661 bool qcow2_can_store_new_dirty_bitmap(BlockDriverState *bs, 662 const char *name, 663 uint32_t granularity, 664 Error **errp); 665 void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs, 666 const char *name, 667 Error **errp); 668 669 #endif 670