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25#ifndef BLOCK_QCOW2_H
26#define BLOCK_QCOW2_H
27
28#include "crypto/block.h"
29#include "qemu/coroutine.h"
30#include "qemu/units.h"
31
32
33
34
35
36#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
37
38#define QCOW_CRYPT_NONE 0
39#define QCOW_CRYPT_AES 1
40#define QCOW_CRYPT_LUKS 2
41
42#define QCOW_MAX_CRYPT_CLUSTERS 32
43#define QCOW_MAX_SNAPSHOTS 65536
44
45
46
47
48
49#define QCOW_MAX_CLUSTER_OFFSET ((1ULL << 56) - 1)
50
51
52
53#define QCOW_MAX_REFTABLE_SIZE (8 * MiB)
54
55
56
57#define QCOW_MAX_L1_SIZE (32 * MiB)
58
59
60
61#define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
62
63
64#define QCOW2_MAX_BITMAPS 65535
65#define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
66
67
68#define QCOW_OFLAG_COPIED (1ULL << 63)
69
70#define QCOW_OFLAG_COMPRESSED (1ULL << 62)
71
72#define QCOW_OFLAG_ZERO (1ULL << 0)
73
74#define MIN_CLUSTER_BITS 9
75#define MAX_CLUSTER_BITS 21
76
77
78#define MIN_L2_CACHE_SIZE 2
79
80
81#define MIN_REFCOUNT_CACHE_SIZE 4
82
83#ifdef CONFIG_LINUX
84#define DEFAULT_L2_CACHE_MAX_SIZE (32 * MiB)
85#define DEFAULT_CACHE_CLEAN_INTERVAL 600
86#else
87#define DEFAULT_L2_CACHE_MAX_SIZE (8 * MiB)
88
89#define DEFAULT_CACHE_CLEAN_INTERVAL 0
90#endif
91
92#define DEFAULT_CLUSTER_SIZE 65536
93
94#define QCOW2_OPT_DATA_FILE "data-file"
95#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
96#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
97#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
98#define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
99#define QCOW2_OPT_OVERLAP "overlap-check"
100#define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
101#define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
102#define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
103#define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
104#define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
105#define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
106#define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
107#define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
108#define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
109#define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory"
110#define QCOW2_OPT_CACHE_SIZE "cache-size"
111#define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
112#define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
113#define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
114#define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
115
116typedef struct QCowHeader {
117 uint32_t magic;
118 uint32_t version;
119 uint64_t backing_file_offset;
120 uint32_t backing_file_size;
121 uint32_t cluster_bits;
122 uint64_t size;
123 uint32_t crypt_method;
124 uint32_t l1_size;
125 uint64_t l1_table_offset;
126 uint64_t refcount_table_offset;
127 uint32_t refcount_table_clusters;
128 uint32_t nb_snapshots;
129 uint64_t snapshots_offset;
130
131
132 uint64_t incompatible_features;
133 uint64_t compatible_features;
134 uint64_t autoclear_features;
135
136 uint32_t refcount_order;
137 uint32_t header_length;
138} QEMU_PACKED QCowHeader;
139
140typedef struct QEMU_PACKED QCowSnapshotHeader {
141
142 uint64_t l1_table_offset;
143
144 uint32_t l1_size;
145 uint16_t id_str_size;
146 uint16_t name_size;
147
148 uint32_t date_sec;
149 uint32_t date_nsec;
150
151 uint64_t vm_clock_nsec;
152
153 uint32_t vm_state_size;
154 uint32_t extra_data_size;
155
156
157
158} QCowSnapshotHeader;
159
160typedef struct QEMU_PACKED QCowSnapshotExtraData {
161 uint64_t vm_state_size_large;
162 uint64_t disk_size;
163} QCowSnapshotExtraData;
164
165
166typedef struct QCowSnapshot {
167 uint64_t l1_table_offset;
168 uint32_t l1_size;
169 char *id_str;
170 char *name;
171 uint64_t disk_size;
172 uint64_t vm_state_size;
173 uint32_t date_sec;
174 uint32_t date_nsec;
175 uint64_t vm_clock_nsec;
176} QCowSnapshot;
177
178struct Qcow2Cache;
179typedef struct Qcow2Cache Qcow2Cache;
180
181typedef struct Qcow2CryptoHeaderExtension {
182 uint64_t offset;
183 uint64_t length;
184} QEMU_PACKED Qcow2CryptoHeaderExtension;
185
186typedef struct Qcow2UnknownHeaderExtension {
187 uint32_t magic;
188 uint32_t len;
189 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
190 uint8_t data[];
191} Qcow2UnknownHeaderExtension;
192
193enum {
194 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0,
195 QCOW2_FEAT_TYPE_COMPATIBLE = 1,
196 QCOW2_FEAT_TYPE_AUTOCLEAR = 2,
197};
198
199
200enum {
201 QCOW2_INCOMPAT_DIRTY_BITNR = 0,
202 QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
203 QCOW2_INCOMPAT_DATA_FILE_BITNR = 2,
204 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
205 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
206 QCOW2_INCOMPAT_DATA_FILE = 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR,
207
208 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
209 | QCOW2_INCOMPAT_CORRUPT
210 | QCOW2_INCOMPAT_DATA_FILE,
211};
212
213
214enum {
215 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0,
216 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
217
218 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
219};
220
221
222enum {
223 QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
224 QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR = 1,
225 QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
226 QCOW2_AUTOCLEAR_DATA_FILE_RAW = 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR,
227
228 QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS
229 | QCOW2_AUTOCLEAR_DATA_FILE_RAW,
230};
231
232enum qcow2_discard_type {
233 QCOW2_DISCARD_NEVER = 0,
234 QCOW2_DISCARD_ALWAYS,
235 QCOW2_DISCARD_REQUEST,
236 QCOW2_DISCARD_SNAPSHOT,
237 QCOW2_DISCARD_OTHER,
238 QCOW2_DISCARD_MAX
239};
240
241typedef struct Qcow2Feature {
242 uint8_t type;
243 uint8_t bit;
244 char name[46];
245} QEMU_PACKED Qcow2Feature;
246
247typedef struct Qcow2DiscardRegion {
248 BlockDriverState *bs;
249 uint64_t offset;
250 uint64_t bytes;
251 QTAILQ_ENTRY(Qcow2DiscardRegion) next;
252} Qcow2DiscardRegion;
253
254typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
255 uint64_t index);
256typedef void Qcow2SetRefcountFunc(void *refcount_array,
257 uint64_t index, uint64_t value);
258
259typedef struct Qcow2BitmapHeaderExt {
260 uint32_t nb_bitmaps;
261 uint32_t reserved32;
262 uint64_t bitmap_directory_size;
263 uint64_t bitmap_directory_offset;
264} QEMU_PACKED Qcow2BitmapHeaderExt;
265
266typedef struct BDRVQcow2State {
267 int cluster_bits;
268 int cluster_size;
269 int cluster_sectors;
270 int l2_slice_size;
271 int l2_bits;
272 int l2_size;
273 int l1_size;
274 int l1_vm_state_index;
275 int refcount_block_bits;
276 int refcount_block_size;
277 int csize_shift;
278 int csize_mask;
279 uint64_t cluster_offset_mask;
280 uint64_t l1_table_offset;
281 uint64_t *l1_table;
282
283 Qcow2Cache* l2_table_cache;
284 Qcow2Cache* refcount_block_cache;
285 QEMUTimer *cache_clean_timer;
286 unsigned cache_clean_interval;
287
288 uint8_t *cluster_cache;
289 uint8_t *cluster_data;
290 uint64_t cluster_cache_offset;
291 QLIST_HEAD(, QCowL2Meta) cluster_allocs;
292
293 uint64_t *refcount_table;
294 uint64_t refcount_table_offset;
295 uint32_t refcount_table_size;
296 uint32_t max_refcount_table_index;
297 uint64_t free_cluster_index;
298 uint64_t free_byte_offset;
299
300 CoMutex lock;
301
302 Qcow2CryptoHeaderExtension crypto_header;
303 QCryptoBlockOpenOptions *crypto_opts;
304 QCryptoBlock *crypto;
305 bool crypt_physical_offset;
306
307 uint32_t crypt_method_header;
308 uint64_t snapshots_offset;
309 int snapshots_size;
310 unsigned int nb_snapshots;
311 QCowSnapshot *snapshots;
312
313 uint32_t nb_bitmaps;
314 uint64_t bitmap_directory_size;
315 uint64_t bitmap_directory_offset;
316
317 int flags;
318 int qcow_version;
319 bool use_lazy_refcounts;
320 int refcount_order;
321 int refcount_bits;
322 uint64_t refcount_max;
323
324 Qcow2GetRefcountFunc *get_refcount;
325 Qcow2SetRefcountFunc *set_refcount;
326
327 bool discard_passthrough[QCOW2_DISCARD_MAX];
328
329 int overlap_check;
330 bool signaled_corruption;
331
332 uint64_t incompatible_features;
333 uint64_t compatible_features;
334 uint64_t autoclear_features;
335
336 size_t unknown_header_fields_size;
337 void* unknown_header_fields;
338 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
339 QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
340 bool cache_discards;
341
342
343
344
345 char *image_backing_file;
346 char *image_backing_format;
347 char *image_data_file;
348
349 CoQueue compress_wait_queue;
350 int nb_compress_threads;
351
352 BdrvChild *data_file;
353} BDRVQcow2State;
354
355typedef struct Qcow2COWRegion {
356
357
358
359
360 unsigned offset;
361
362
363 unsigned nb_bytes;
364} Qcow2COWRegion;
365
366
367
368
369
370typedef struct QCowL2Meta
371{
372
373 uint64_t offset;
374
375
376 uint64_t alloc_offset;
377
378
379 int nb_clusters;
380
381
382 bool keep_old_clusters;
383
384
385
386
387
388 CoQueue dependent_requests;
389
390
391
392
393
394 Qcow2COWRegion cow_start;
395
396
397
398
399
400 Qcow2COWRegion cow_end;
401
402
403
404
405
406
407 QEMUIOVector *data_qiov;
408
409
410 struct QCowL2Meta *next;
411
412 QLIST_ENTRY(QCowL2Meta) next_in_flight;
413} QCowL2Meta;
414
415typedef enum QCow2ClusterType {
416 QCOW2_CLUSTER_UNALLOCATED,
417 QCOW2_CLUSTER_ZERO_PLAIN,
418 QCOW2_CLUSTER_ZERO_ALLOC,
419 QCOW2_CLUSTER_NORMAL,
420 QCOW2_CLUSTER_COMPRESSED,
421} QCow2ClusterType;
422
423typedef enum QCow2MetadataOverlap {
424 QCOW2_OL_MAIN_HEADER_BITNR = 0,
425 QCOW2_OL_ACTIVE_L1_BITNR = 1,
426 QCOW2_OL_ACTIVE_L2_BITNR = 2,
427 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,
428 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,
429 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,
430 QCOW2_OL_INACTIVE_L1_BITNR = 6,
431 QCOW2_OL_INACTIVE_L2_BITNR = 7,
432 QCOW2_OL_BITMAP_DIRECTORY_BITNR = 8,
433
434 QCOW2_OL_MAX_BITNR = 9,
435
436 QCOW2_OL_NONE = 0,
437 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR),
438 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR),
439 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR),
440 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),
441 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),
442 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),
443 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR),
444
445
446 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
447 QCOW2_OL_BITMAP_DIRECTORY = (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR),
448} QCow2MetadataOverlap;
449
450
451#define QCOW2_OL_CONSTANT \
452 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
453 QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY)
454
455
456#define QCOW2_OL_CACHED \
457 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
458 QCOW2_OL_INACTIVE_L1)
459
460
461#define QCOW2_OL_ALL \
462 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
463
464#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
465#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
466#define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
467
468#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
469
470#define INV_OFFSET (-1ULL)
471
472static inline bool has_data_file(BlockDriverState *bs)
473{
474 BDRVQcow2State *s = bs->opaque;
475 return (s->data_file != bs->file);
476}
477
478static inline bool data_file_is_raw(BlockDriverState *bs)
479{
480 BDRVQcow2State *s = bs->opaque;
481 return !!(s->autoclear_features & QCOW2_AUTOCLEAR_DATA_FILE_RAW);
482}
483
484static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
485{
486 return offset & ~(s->cluster_size - 1);
487}
488
489static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
490{
491 return offset & (s->cluster_size - 1);
492}
493
494static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
495{
496 return (size + (s->cluster_size - 1)) >> s->cluster_bits;
497}
498
499static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
500{
501 int shift = s->cluster_bits + s->l2_bits;
502 return (size + (1ULL << shift) - 1) >> shift;
503}
504
505static inline int offset_to_l1_index(BDRVQcow2State *s, uint64_t offset)
506{
507 return offset >> (s->l2_bits + s->cluster_bits);
508}
509
510static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
511{
512 return (offset >> s->cluster_bits) & (s->l2_size - 1);
513}
514
515static inline int offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset)
516{
517 return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
518}
519
520static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
521{
522 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
523}
524
525static inline QCow2ClusterType qcow2_get_cluster_type(BlockDriverState *bs,
526 uint64_t l2_entry)
527{
528 if (l2_entry & QCOW_OFLAG_COMPRESSED) {
529 return QCOW2_CLUSTER_COMPRESSED;
530 } else if (l2_entry & QCOW_OFLAG_ZERO) {
531 if (l2_entry & L2E_OFFSET_MASK) {
532 return QCOW2_CLUSTER_ZERO_ALLOC;
533 }
534 return QCOW2_CLUSTER_ZERO_PLAIN;
535 } else if (!(l2_entry & L2E_OFFSET_MASK)) {
536
537
538
539
540 if (has_data_file(bs) && (l2_entry & QCOW_OFLAG_COPIED)) {
541 return QCOW2_CLUSTER_NORMAL;
542 } else {
543 return QCOW2_CLUSTER_UNALLOCATED;
544 }
545 } else {
546 return QCOW2_CLUSTER_NORMAL;
547 }
548}
549
550
551static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
552{
553 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
554}
555
556static inline uint64_t l2meta_cow_start(QCowL2Meta *m)
557{
558 return m->offset + m->cow_start.offset;
559}
560
561static inline uint64_t l2meta_cow_end(QCowL2Meta *m)
562{
563 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
564}
565
566static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
567{
568 return r1 > r2 ? r1 - r2 : r2 - r1;
569}
570
571static inline
572uint32_t offset_to_reftable_index(BDRVQcow2State *s, uint64_t offset)
573{
574 return offset >> (s->refcount_block_bits + s->cluster_bits);
575}
576
577
578int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size,
579 int refcount_order, bool generous_increase,
580 uint64_t *refblock_count);
581
582int qcow2_mark_dirty(BlockDriverState *bs);
583int qcow2_mark_corrupt(BlockDriverState *bs);
584int qcow2_mark_consistent(BlockDriverState *bs);
585int qcow2_update_header(BlockDriverState *bs);
586
587void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
588 int64_t size, const char *message_format, ...)
589 GCC_FMT_ATTR(5, 6);
590
591int qcow2_validate_table(BlockDriverState *bs, uint64_t offset,
592 uint64_t entries, size_t entry_len,
593 int64_t max_size_bytes, const char *table_name,
594 Error **errp);
595
596
597int qcow2_refcount_init(BlockDriverState *bs);
598void qcow2_refcount_close(BlockDriverState *bs);
599
600int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
601 uint64_t *refcount);
602
603int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
604 uint64_t addend, bool decrease,
605 enum qcow2_discard_type type);
606
607int64_t qcow2_refcount_area(BlockDriverState *bs, uint64_t offset,
608 uint64_t additional_clusters, bool exact_size,
609 int new_refblock_index,
610 uint64_t new_refblock_offset);
611
612int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
613int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
614 int64_t nb_clusters);
615int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
616void qcow2_free_clusters(BlockDriverState *bs,
617 int64_t offset, int64_t size,
618 enum qcow2_discard_type type);
619void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
620 int nb_clusters, enum qcow2_discard_type type);
621
622int qcow2_update_snapshot_refcount(BlockDriverState *bs,
623 int64_t l1_table_offset, int l1_size, int addend);
624
625int coroutine_fn qcow2_flush_caches(BlockDriverState *bs);
626int coroutine_fn qcow2_write_caches(BlockDriverState *bs);
627int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
628 BdrvCheckMode fix);
629
630void qcow2_process_discards(BlockDriverState *bs, int ret);
631
632int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
633 int64_t size);
634int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
635 int64_t size, bool data_file);
636int qcow2_inc_refcounts_imrt(BlockDriverState *bs, BdrvCheckResult *res,
637 void **refcount_table,
638 int64_t *refcount_table_size,
639 int64_t offset, int64_t size);
640
641int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
642 BlockDriverAmendStatusCB *status_cb,
643 void *cb_opaque, Error **errp);
644int qcow2_shrink_reftable(BlockDriverState *bs);
645int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size);
646
647
648int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
649 bool exact_size);
650int qcow2_shrink_l1_table(BlockDriverState *bs, uint64_t max_size);
651int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
652int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
653 uint8_t *buf, int nb_sectors, bool enc, Error **errp);
654
655int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
656 unsigned int *bytes, uint64_t *cluster_offset);
657int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
658 unsigned int *bytes, uint64_t *host_offset,
659 QCowL2Meta **m);
660int qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
661 uint64_t offset,
662 int compressed_size,
663 uint64_t *host_offset);
664
665int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
666void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m);
667int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset,
668 uint64_t bytes, enum qcow2_discard_type type,
669 bool full_discard);
670int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset,
671 uint64_t bytes, int flags);
672
673int qcow2_expand_zero_clusters(BlockDriverState *bs,
674 BlockDriverAmendStatusCB *status_cb,
675 void *cb_opaque);
676
677
678int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
679int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
680int qcow2_snapshot_delete(BlockDriverState *bs,
681 const char *snapshot_id,
682 const char *name,
683 Error **errp);
684int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
685int qcow2_snapshot_load_tmp(BlockDriverState *bs,
686 const char *snapshot_id,
687 const char *name,
688 Error **errp);
689
690void qcow2_free_snapshots(BlockDriverState *bs);
691int qcow2_read_snapshots(BlockDriverState *bs);
692
693
694Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables,
695 unsigned table_size);
696int qcow2_cache_destroy(Qcow2Cache *c);
697
698void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
699int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
700int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
701int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
702 Qcow2Cache *dependency);
703void qcow2_cache_depends_on_flush(Qcow2Cache *c);
704
705void qcow2_cache_clean_unused(Qcow2Cache *c);
706int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
707
708int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
709 void **table);
710int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
711 void **table);
712void qcow2_cache_put(Qcow2Cache *c, void **table);
713void *qcow2_cache_is_table_offset(Qcow2Cache *c, uint64_t offset);
714void qcow2_cache_discard(Qcow2Cache *c, void *table);
715
716
717int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
718 void **refcount_table,
719 int64_t *refcount_table_size);
720bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, Error **errp);
721Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
722 Error **errp);
723int qcow2_reopen_bitmaps_rw_hint(BlockDriverState *bs, bool *header_updated,
724 Error **errp);
725int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
726int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp);
727void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp);
728int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp);
729bool qcow2_can_store_new_dirty_bitmap(BlockDriverState *bs,
730 const char *name,
731 uint32_t granularity,
732 Error **errp);
733void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
734 const char *name,
735 Error **errp);
736
737#endif
738