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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 S_8MiB
54
55
56
57#define QCOW_MAX_L1_SIZE S_32MiB
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 S_32MiB
85#define DEFAULT_CACHE_CLEAN_INTERVAL 600
86#else
87#define DEFAULT_L2_CACHE_MAX_SIZE S_8MiB
88
89#define DEFAULT_CACHE_CLEAN_INTERVAL 0
90#endif
91
92#define DEFAULT_CLUSTER_SIZE S_64KiB
93
94#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
95#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
96#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
97#define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
98#define QCOW2_OPT_OVERLAP "overlap-check"
99#define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
100#define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
101#define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
102#define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
103#define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
104#define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
105#define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
106#define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
107#define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
108#define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory"
109#define QCOW2_OPT_CACHE_SIZE "cache-size"
110#define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
111#define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
112#define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
113#define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
114
115typedef struct QCowHeader {
116 uint32_t magic;
117 uint32_t version;
118 uint64_t backing_file_offset;
119 uint32_t backing_file_size;
120 uint32_t cluster_bits;
121 uint64_t size;
122 uint32_t crypt_method;
123 uint32_t l1_size;
124 uint64_t l1_table_offset;
125 uint64_t refcount_table_offset;
126 uint32_t refcount_table_clusters;
127 uint32_t nb_snapshots;
128 uint64_t snapshots_offset;
129
130
131 uint64_t incompatible_features;
132 uint64_t compatible_features;
133 uint64_t autoclear_features;
134
135 uint32_t refcount_order;
136 uint32_t header_length;
137} QEMU_PACKED QCowHeader;
138
139typedef struct QEMU_PACKED QCowSnapshotHeader {
140
141 uint64_t l1_table_offset;
142
143 uint32_t l1_size;
144 uint16_t id_str_size;
145 uint16_t name_size;
146
147 uint32_t date_sec;
148 uint32_t date_nsec;
149
150 uint64_t vm_clock_nsec;
151
152 uint32_t vm_state_size;
153 uint32_t extra_data_size;
154
155
156
157} QCowSnapshotHeader;
158
159typedef struct QEMU_PACKED QCowSnapshotExtraData {
160 uint64_t vm_state_size_large;
161 uint64_t disk_size;
162} QCowSnapshotExtraData;
163
164
165typedef struct QCowSnapshot {
166 uint64_t l1_table_offset;
167 uint32_t l1_size;
168 char *id_str;
169 char *name;
170 uint64_t disk_size;
171 uint64_t vm_state_size;
172 uint32_t date_sec;
173 uint32_t date_nsec;
174 uint64_t vm_clock_nsec;
175} QCowSnapshot;
176
177struct Qcow2Cache;
178typedef struct Qcow2Cache Qcow2Cache;
179
180typedef struct Qcow2CryptoHeaderExtension {
181 uint64_t offset;
182 uint64_t length;
183} QEMU_PACKED Qcow2CryptoHeaderExtension;
184
185typedef struct Qcow2UnknownHeaderExtension {
186 uint32_t magic;
187 uint32_t len;
188 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
189 uint8_t data[];
190} Qcow2UnknownHeaderExtension;
191
192enum {
193 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0,
194 QCOW2_FEAT_TYPE_COMPATIBLE = 1,
195 QCOW2_FEAT_TYPE_AUTOCLEAR = 2,
196};
197
198
199enum {
200 QCOW2_INCOMPAT_DIRTY_BITNR = 0,
201 QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
202 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
203 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
204
205 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
206 | QCOW2_INCOMPAT_CORRUPT,
207};
208
209
210enum {
211 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0,
212 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
213
214 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
215};
216
217
218enum {
219 QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
220 QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
221
222 QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS,
223};
224
225enum qcow2_discard_type {
226 QCOW2_DISCARD_NEVER = 0,
227 QCOW2_DISCARD_ALWAYS,
228 QCOW2_DISCARD_REQUEST,
229 QCOW2_DISCARD_SNAPSHOT,
230 QCOW2_DISCARD_OTHER,
231 QCOW2_DISCARD_MAX
232};
233
234typedef struct Qcow2Feature {
235 uint8_t type;
236 uint8_t bit;
237 char name[46];
238} QEMU_PACKED Qcow2Feature;
239
240typedef struct Qcow2DiscardRegion {
241 BlockDriverState *bs;
242 uint64_t offset;
243 uint64_t bytes;
244 QTAILQ_ENTRY(Qcow2DiscardRegion) next;
245} Qcow2DiscardRegion;
246
247typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
248 uint64_t index);
249typedef void Qcow2SetRefcountFunc(void *refcount_array,
250 uint64_t index, uint64_t value);
251
252typedef struct Qcow2BitmapHeaderExt {
253 uint32_t nb_bitmaps;
254 uint32_t reserved32;
255 uint64_t bitmap_directory_size;
256 uint64_t bitmap_directory_offset;
257} QEMU_PACKED Qcow2BitmapHeaderExt;
258
259typedef struct BDRVQcow2State {
260 int cluster_bits;
261 int cluster_size;
262 int cluster_sectors;
263 int l2_slice_size;
264 int l2_bits;
265 int l2_size;
266 int l1_size;
267 int l1_vm_state_index;
268 int refcount_block_bits;
269 int refcount_block_size;
270 int csize_shift;
271 int csize_mask;
272 uint64_t cluster_offset_mask;
273 uint64_t l1_table_offset;
274 uint64_t *l1_table;
275
276 Qcow2Cache* l2_table_cache;
277 Qcow2Cache* refcount_block_cache;
278 QEMUTimer *cache_clean_timer;
279 unsigned cache_clean_interval;
280
281 uint8_t *cluster_cache;
282 uint8_t *cluster_data;
283 uint64_t cluster_cache_offset;
284 QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs;
285
286 uint64_t *refcount_table;
287 uint64_t refcount_table_offset;
288 uint32_t refcount_table_size;
289 uint32_t max_refcount_table_index;
290 uint64_t free_cluster_index;
291 uint64_t free_byte_offset;
292
293 CoMutex lock;
294
295 Qcow2CryptoHeaderExtension crypto_header;
296 QCryptoBlockOpenOptions *crypto_opts;
297 QCryptoBlock *crypto;
298 bool crypt_physical_offset;
299
300 uint32_t crypt_method_header;
301 uint64_t snapshots_offset;
302 int snapshots_size;
303 unsigned int nb_snapshots;
304 QCowSnapshot *snapshots;
305
306 uint32_t nb_bitmaps;
307 uint64_t bitmap_directory_size;
308 uint64_t bitmap_directory_offset;
309
310 int flags;
311 int qcow_version;
312 bool use_lazy_refcounts;
313 int refcount_order;
314 int refcount_bits;
315 uint64_t refcount_max;
316
317 Qcow2GetRefcountFunc *get_refcount;
318 Qcow2SetRefcountFunc *set_refcount;
319
320 bool discard_passthrough[QCOW2_DISCARD_MAX];
321
322 int overlap_check;
323 bool signaled_corruption;
324
325 uint64_t incompatible_features;
326 uint64_t compatible_features;
327 uint64_t autoclear_features;
328
329 size_t unknown_header_fields_size;
330 void* unknown_header_fields;
331 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
332 QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
333 bool cache_discards;
334
335
336
337
338 char *image_backing_file;
339 char *image_backing_format;
340
341 CoQueue compress_wait_queue;
342 int nb_compress_threads;
343} BDRVQcow2State;
344
345typedef struct Qcow2COWRegion {
346
347
348
349
350 unsigned offset;
351
352
353 unsigned nb_bytes;
354} Qcow2COWRegion;
355
356
357
358
359
360typedef struct QCowL2Meta
361{
362
363 uint64_t offset;
364
365
366 uint64_t alloc_offset;
367
368
369 int nb_clusters;
370
371
372 bool keep_old_clusters;
373
374
375
376
377
378 CoQueue dependent_requests;
379
380
381
382
383
384 Qcow2COWRegion cow_start;
385
386
387
388
389
390 Qcow2COWRegion cow_end;
391
392
393
394
395
396
397 QEMUIOVector *data_qiov;
398
399
400 struct QCowL2Meta *next;
401
402 QLIST_ENTRY(QCowL2Meta) next_in_flight;
403} QCowL2Meta;
404
405typedef enum QCow2ClusterType {
406 QCOW2_CLUSTER_UNALLOCATED,
407 QCOW2_CLUSTER_ZERO_PLAIN,
408 QCOW2_CLUSTER_ZERO_ALLOC,
409 QCOW2_CLUSTER_NORMAL,
410 QCOW2_CLUSTER_COMPRESSED,
411} QCow2ClusterType;
412
413typedef enum QCow2MetadataOverlap {
414 QCOW2_OL_MAIN_HEADER_BITNR = 0,
415 QCOW2_OL_ACTIVE_L1_BITNR = 1,
416 QCOW2_OL_ACTIVE_L2_BITNR = 2,
417 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,
418 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,
419 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,
420 QCOW2_OL_INACTIVE_L1_BITNR = 6,
421 QCOW2_OL_INACTIVE_L2_BITNR = 7,
422 QCOW2_OL_BITMAP_DIRECTORY_BITNR = 8,
423
424 QCOW2_OL_MAX_BITNR = 9,
425
426 QCOW2_OL_NONE = 0,
427 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR),
428 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR),
429 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR),
430 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),
431 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),
432 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),
433 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR),
434
435
436 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
437 QCOW2_OL_BITMAP_DIRECTORY = (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR),
438} QCow2MetadataOverlap;
439
440
441#define QCOW2_OL_CONSTANT \
442 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
443 QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY)
444
445
446#define QCOW2_OL_CACHED \
447 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
448 QCOW2_OL_INACTIVE_L1)
449
450
451#define QCOW2_OL_ALL \
452 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
453
454#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
455#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
456#define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
457
458#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
459
460static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
461{
462 return offset & ~(s->cluster_size - 1);
463}
464
465static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
466{
467 return offset & (s->cluster_size - 1);
468}
469
470static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
471{
472 return (size + (s->cluster_size - 1)) >> s->cluster_bits;
473}
474
475static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
476{
477 int shift = s->cluster_bits + s->l2_bits;
478 return (size + (1ULL << shift) - 1) >> shift;
479}
480
481static inline int offset_to_l1_index(BDRVQcow2State *s, uint64_t offset)
482{
483 return offset >> (s->l2_bits + s->cluster_bits);
484}
485
486static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
487{
488 return (offset >> s->cluster_bits) & (s->l2_size - 1);
489}
490
491static inline int offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset)
492{
493 return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
494}
495
496static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
497{
498 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
499}
500
501static inline QCow2ClusterType qcow2_get_cluster_type(uint64_t l2_entry)
502{
503 if (l2_entry & QCOW_OFLAG_COMPRESSED) {
504 return QCOW2_CLUSTER_COMPRESSED;
505 } else if (l2_entry & QCOW_OFLAG_ZERO) {
506 if (l2_entry & L2E_OFFSET_MASK) {
507 return QCOW2_CLUSTER_ZERO_ALLOC;
508 }
509 return QCOW2_CLUSTER_ZERO_PLAIN;
510 } else if (!(l2_entry & L2E_OFFSET_MASK)) {
511 return QCOW2_CLUSTER_UNALLOCATED;
512 } else {
513 return QCOW2_CLUSTER_NORMAL;
514 }
515}
516
517
518static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
519{
520 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
521}
522
523static inline uint64_t l2meta_cow_start(QCowL2Meta *m)
524{
525 return m->offset + m->cow_start.offset;
526}
527
528static inline uint64_t l2meta_cow_end(QCowL2Meta *m)
529{
530 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
531}
532
533static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
534{
535 return r1 > r2 ? r1 - r2 : r2 - r1;
536}
537
538static inline
539uint32_t offset_to_reftable_index(BDRVQcow2State *s, uint64_t offset)
540{
541 return offset >> (s->refcount_block_bits + s->cluster_bits);
542}
543
544
545int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size,
546 int refcount_order, bool generous_increase,
547 uint64_t *refblock_count);
548
549int qcow2_mark_dirty(BlockDriverState *bs);
550int qcow2_mark_corrupt(BlockDriverState *bs);
551int qcow2_mark_consistent(BlockDriverState *bs);
552int qcow2_update_header(BlockDriverState *bs);
553
554void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
555 int64_t size, const char *message_format, ...)
556 GCC_FMT_ATTR(5, 6);
557
558int qcow2_validate_table(BlockDriverState *bs, uint64_t offset,
559 uint64_t entries, size_t entry_len,
560 int64_t max_size_bytes, const char *table_name,
561 Error **errp);
562
563
564int qcow2_refcount_init(BlockDriverState *bs);
565void qcow2_refcount_close(BlockDriverState *bs);
566
567int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
568 uint64_t *refcount);
569
570int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
571 uint64_t addend, bool decrease,
572 enum qcow2_discard_type type);
573
574int64_t qcow2_refcount_area(BlockDriverState *bs, uint64_t offset,
575 uint64_t additional_clusters, bool exact_size,
576 int new_refblock_index,
577 uint64_t new_refblock_offset);
578
579int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
580int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
581 int64_t nb_clusters);
582int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
583void qcow2_free_clusters(BlockDriverState *bs,
584 int64_t offset, int64_t size,
585 enum qcow2_discard_type type);
586void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
587 int nb_clusters, enum qcow2_discard_type type);
588
589int qcow2_update_snapshot_refcount(BlockDriverState *bs,
590 int64_t l1_table_offset, int l1_size, int addend);
591
592int coroutine_fn qcow2_flush_caches(BlockDriverState *bs);
593int coroutine_fn qcow2_write_caches(BlockDriverState *bs);
594int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
595 BdrvCheckMode fix);
596
597void qcow2_process_discards(BlockDriverState *bs, int ret);
598
599int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
600 int64_t size);
601int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
602 int64_t size);
603int qcow2_inc_refcounts_imrt(BlockDriverState *bs, BdrvCheckResult *res,
604 void **refcount_table,
605 int64_t *refcount_table_size,
606 int64_t offset, int64_t size);
607
608int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
609 BlockDriverAmendStatusCB *status_cb,
610 void *cb_opaque, Error **errp);
611int qcow2_shrink_reftable(BlockDriverState *bs);
612int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size);
613
614
615int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
616 bool exact_size);
617int qcow2_shrink_l1_table(BlockDriverState *bs, uint64_t max_size);
618int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
619int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
620int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
621 uint8_t *buf, int nb_sectors, bool enc, Error **errp);
622
623int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
624 unsigned int *bytes, uint64_t *cluster_offset);
625int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
626 unsigned int *bytes, uint64_t *host_offset,
627 QCowL2Meta **m);
628uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
629 uint64_t offset,
630 int compressed_size);
631
632int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
633void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m);
634int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset,
635 uint64_t bytes, enum qcow2_discard_type type,
636 bool full_discard);
637int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset,
638 uint64_t bytes, int flags);
639
640int qcow2_expand_zero_clusters(BlockDriverState *bs,
641 BlockDriverAmendStatusCB *status_cb,
642 void *cb_opaque);
643
644
645int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
646int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
647int qcow2_snapshot_delete(BlockDriverState *bs,
648 const char *snapshot_id,
649 const char *name,
650 Error **errp);
651int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
652int qcow2_snapshot_load_tmp(BlockDriverState *bs,
653 const char *snapshot_id,
654 const char *name,
655 Error **errp);
656
657void qcow2_free_snapshots(BlockDriverState *bs);
658int qcow2_read_snapshots(BlockDriverState *bs);
659
660
661Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables,
662 unsigned table_size);
663int qcow2_cache_destroy(Qcow2Cache *c);
664
665void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
666int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
667int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
668int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
669 Qcow2Cache *dependency);
670void qcow2_cache_depends_on_flush(Qcow2Cache *c);
671
672void qcow2_cache_clean_unused(Qcow2Cache *c);
673int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
674
675int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
676 void **table);
677int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
678 void **table);
679void qcow2_cache_put(Qcow2Cache *c, void **table);
680void *qcow2_cache_is_table_offset(Qcow2Cache *c, uint64_t offset);
681void qcow2_cache_discard(Qcow2Cache *c, void *table);
682
683
684int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
685 void **refcount_table,
686 int64_t *refcount_table_size);
687bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, Error **errp);
688int qcow2_reopen_bitmaps_rw_hint(BlockDriverState *bs, bool *header_updated,
689 Error **errp);
690int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
691void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp);
692int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp);
693bool qcow2_can_store_new_dirty_bitmap(BlockDriverState *bs,
694 const char *name,
695 uint32_t granularity,
696 Error **errp);
697void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
698 const char *name,
699 Error **errp);
700
701#endif
702