1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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#include "block/block_int.h"
32
33
34
35
36
37#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
38
39#define QCOW_CRYPT_NONE 0
40#define QCOW_CRYPT_AES 1
41#define QCOW_CRYPT_LUKS 2
42
43#define QCOW_MAX_CRYPT_CLUSTERS 32
44#define QCOW_MAX_SNAPSHOTS 65536
45
46
47
48
49
50#define QCOW_MAX_CLUSTER_OFFSET ((1ULL << 56) - 1)
51
52
53
54#define QCOW_MAX_REFTABLE_SIZE (8 * MiB)
55
56
57
58#define QCOW_MAX_L1_SIZE (32 * MiB)
59
60
61
62#define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
63
64
65#define QCOW_MAX_SNAPSHOT_EXTRA_DATA 1024
66
67
68#define QCOW2_MAX_BITMAPS 65535
69#define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
70
71
72#define QCOW2_MAX_WORKERS 8
73
74
75#define QCOW_OFLAG_COPIED (1ULL << 63)
76
77#define QCOW_OFLAG_COMPRESSED (1ULL << 62)
78
79#define QCOW_OFLAG_ZERO (1ULL << 0)
80
81#define MIN_CLUSTER_BITS 9
82#define MAX_CLUSTER_BITS 21
83
84
85#define QCOW2_COMPRESSED_SECTOR_SIZE 512U
86#define QCOW2_COMPRESSED_SECTOR_MASK (~(QCOW2_COMPRESSED_SECTOR_SIZE - 1ULL))
87
88
89#define MIN_L2_CACHE_SIZE 2
90
91
92#define MIN_REFCOUNT_CACHE_SIZE 4
93
94#ifdef CONFIG_LINUX
95#define DEFAULT_L2_CACHE_MAX_SIZE (32 * MiB)
96#define DEFAULT_CACHE_CLEAN_INTERVAL 600
97#else
98#define DEFAULT_L2_CACHE_MAX_SIZE (8 * MiB)
99
100#define DEFAULT_CACHE_CLEAN_INTERVAL 0
101#endif
102
103#define DEFAULT_CLUSTER_SIZE 65536
104
105#define QCOW2_OPT_DATA_FILE "data-file"
106#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
107#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
108#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
109#define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
110#define QCOW2_OPT_OVERLAP "overlap-check"
111#define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
112#define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
113#define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
114#define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
115#define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
116#define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
117#define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
118#define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
119#define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
120#define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory"
121#define QCOW2_OPT_CACHE_SIZE "cache-size"
122#define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
123#define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
124#define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
125#define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
126
127typedef struct QCowHeader {
128 uint32_t magic;
129 uint32_t version;
130 uint64_t backing_file_offset;
131 uint32_t backing_file_size;
132 uint32_t cluster_bits;
133 uint64_t size;
134 uint32_t crypt_method;
135 uint32_t l1_size;
136 uint64_t l1_table_offset;
137 uint64_t refcount_table_offset;
138 uint32_t refcount_table_clusters;
139 uint32_t nb_snapshots;
140 uint64_t snapshots_offset;
141
142
143 uint64_t incompatible_features;
144 uint64_t compatible_features;
145 uint64_t autoclear_features;
146
147 uint32_t refcount_order;
148 uint32_t header_length;
149} QEMU_PACKED QCowHeader;
150
151typedef struct QEMU_PACKED QCowSnapshotHeader {
152
153 uint64_t l1_table_offset;
154
155 uint32_t l1_size;
156 uint16_t id_str_size;
157 uint16_t name_size;
158
159 uint32_t date_sec;
160 uint32_t date_nsec;
161
162 uint64_t vm_clock_nsec;
163
164 uint32_t vm_state_size;
165 uint32_t extra_data_size;
166
167
168
169} QCowSnapshotHeader;
170
171typedef struct QEMU_PACKED QCowSnapshotExtraData {
172 uint64_t vm_state_size_large;
173 uint64_t disk_size;
174} QCowSnapshotExtraData;
175
176
177typedef struct QCowSnapshot {
178 uint64_t l1_table_offset;
179 uint32_t l1_size;
180 char *id_str;
181 char *name;
182 uint64_t disk_size;
183 uint64_t vm_state_size;
184 uint32_t date_sec;
185 uint32_t date_nsec;
186 uint64_t vm_clock_nsec;
187
188 uint32_t extra_data_size;
189
190 void *unknown_extra_data;
191} QCowSnapshot;
192
193struct Qcow2Cache;
194typedef struct Qcow2Cache Qcow2Cache;
195
196typedef struct Qcow2CryptoHeaderExtension {
197 uint64_t offset;
198 uint64_t length;
199} QEMU_PACKED Qcow2CryptoHeaderExtension;
200
201typedef struct Qcow2UnknownHeaderExtension {
202 uint32_t magic;
203 uint32_t len;
204 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
205 uint8_t data[];
206} Qcow2UnknownHeaderExtension;
207
208enum {
209 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0,
210 QCOW2_FEAT_TYPE_COMPATIBLE = 1,
211 QCOW2_FEAT_TYPE_AUTOCLEAR = 2,
212};
213
214
215enum {
216 QCOW2_INCOMPAT_DIRTY_BITNR = 0,
217 QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
218 QCOW2_INCOMPAT_DATA_FILE_BITNR = 2,
219 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
220 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
221 QCOW2_INCOMPAT_DATA_FILE = 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR,
222
223 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
224 | QCOW2_INCOMPAT_CORRUPT
225 | QCOW2_INCOMPAT_DATA_FILE,
226};
227
228
229enum {
230 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0,
231 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
232
233 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
234};
235
236
237enum {
238 QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
239 QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR = 1,
240 QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
241 QCOW2_AUTOCLEAR_DATA_FILE_RAW = 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR,
242
243 QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS
244 | QCOW2_AUTOCLEAR_DATA_FILE_RAW,
245};
246
247enum qcow2_discard_type {
248 QCOW2_DISCARD_NEVER = 0,
249 QCOW2_DISCARD_ALWAYS,
250 QCOW2_DISCARD_REQUEST,
251 QCOW2_DISCARD_SNAPSHOT,
252 QCOW2_DISCARD_OTHER,
253 QCOW2_DISCARD_MAX
254};
255
256typedef struct Qcow2Feature {
257 uint8_t type;
258 uint8_t bit;
259 char name[46];
260} QEMU_PACKED Qcow2Feature;
261
262typedef struct Qcow2DiscardRegion {
263 BlockDriverState *bs;
264 uint64_t offset;
265 uint64_t bytes;
266 QTAILQ_ENTRY(Qcow2DiscardRegion) next;
267} Qcow2DiscardRegion;
268
269typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
270 uint64_t index);
271typedef void Qcow2SetRefcountFunc(void *refcount_array,
272 uint64_t index, uint64_t value);
273
274typedef struct Qcow2BitmapHeaderExt {
275 uint32_t nb_bitmaps;
276 uint32_t reserved32;
277 uint64_t bitmap_directory_size;
278 uint64_t bitmap_directory_offset;
279} QEMU_PACKED Qcow2BitmapHeaderExt;
280
281#define QCOW2_MAX_THREADS 4
282
283typedef struct BDRVQcow2State {
284 int cluster_bits;
285 int cluster_size;
286 int l2_slice_size;
287 int l2_bits;
288 int l2_size;
289 int l1_size;
290 int l1_vm_state_index;
291 int refcount_block_bits;
292 int refcount_block_size;
293 int csize_shift;
294 int csize_mask;
295 uint64_t cluster_offset_mask;
296 uint64_t l1_table_offset;
297 uint64_t *l1_table;
298
299 Qcow2Cache* l2_table_cache;
300 Qcow2Cache* refcount_block_cache;
301 QEMUTimer *cache_clean_timer;
302 unsigned cache_clean_interval;
303
304 QLIST_HEAD(, QCowL2Meta) cluster_allocs;
305
306 uint64_t *refcount_table;
307 uint64_t refcount_table_offset;
308 uint32_t refcount_table_size;
309 uint32_t max_refcount_table_index;
310 uint64_t free_cluster_index;
311 uint64_t free_byte_offset;
312
313 CoMutex lock;
314
315 Qcow2CryptoHeaderExtension crypto_header;
316 QCryptoBlockOpenOptions *crypto_opts;
317 QCryptoBlock *crypto;
318 bool crypt_physical_offset;
319
320 uint32_t crypt_method_header;
321 uint64_t snapshots_offset;
322 int snapshots_size;
323 unsigned int nb_snapshots;
324 QCowSnapshot *snapshots;
325
326 uint32_t nb_bitmaps;
327 uint64_t bitmap_directory_size;
328 uint64_t bitmap_directory_offset;
329
330 int flags;
331 int qcow_version;
332 bool use_lazy_refcounts;
333 int refcount_order;
334 int refcount_bits;
335 uint64_t refcount_max;
336
337 Qcow2GetRefcountFunc *get_refcount;
338 Qcow2SetRefcountFunc *set_refcount;
339
340 bool discard_passthrough[QCOW2_DISCARD_MAX];
341
342 int overlap_check;
343 bool signaled_corruption;
344
345 uint64_t incompatible_features;
346 uint64_t compatible_features;
347 uint64_t autoclear_features;
348
349 size_t unknown_header_fields_size;
350 void* unknown_header_fields;
351 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
352 QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
353 bool cache_discards;
354
355
356
357
358 char *image_backing_file;
359 char *image_backing_format;
360 char *image_data_file;
361
362 CoQueue thread_task_queue;
363 int nb_threads;
364
365 BdrvChild *data_file;
366
367 bool metadata_preallocation_checked;
368 bool metadata_preallocation;
369} BDRVQcow2State;
370
371typedef struct Qcow2COWRegion {
372
373
374
375
376 unsigned offset;
377
378
379 unsigned nb_bytes;
380} Qcow2COWRegion;
381
382
383
384
385
386typedef struct QCowL2Meta
387{
388
389 uint64_t offset;
390
391
392 uint64_t alloc_offset;
393
394
395 int nb_clusters;
396
397
398 bool keep_old_clusters;
399
400
401
402
403
404 CoQueue dependent_requests;
405
406
407
408
409
410 Qcow2COWRegion cow_start;
411
412
413
414
415
416 Qcow2COWRegion cow_end;
417
418
419
420
421
422 bool skip_cow;
423
424
425
426
427
428
429 QEMUIOVector *data_qiov;
430 size_t data_qiov_offset;
431
432
433 struct QCowL2Meta *next;
434
435 QLIST_ENTRY(QCowL2Meta) next_in_flight;
436} QCowL2Meta;
437
438typedef enum QCow2ClusterType {
439 QCOW2_CLUSTER_UNALLOCATED,
440 QCOW2_CLUSTER_ZERO_PLAIN,
441 QCOW2_CLUSTER_ZERO_ALLOC,
442 QCOW2_CLUSTER_NORMAL,
443 QCOW2_CLUSTER_COMPRESSED,
444} QCow2ClusterType;
445
446typedef enum QCow2MetadataOverlap {
447 QCOW2_OL_MAIN_HEADER_BITNR = 0,
448 QCOW2_OL_ACTIVE_L1_BITNR = 1,
449 QCOW2_OL_ACTIVE_L2_BITNR = 2,
450 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,
451 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,
452 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,
453 QCOW2_OL_INACTIVE_L1_BITNR = 6,
454 QCOW2_OL_INACTIVE_L2_BITNR = 7,
455 QCOW2_OL_BITMAP_DIRECTORY_BITNR = 8,
456
457 QCOW2_OL_MAX_BITNR = 9,
458
459 QCOW2_OL_NONE = 0,
460 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR),
461 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR),
462 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR),
463 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),
464 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),
465 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),
466 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR),
467
468
469 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
470 QCOW2_OL_BITMAP_DIRECTORY = (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR),
471} QCow2MetadataOverlap;
472
473
474#define QCOW2_OL_CONSTANT \
475 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
476 QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY)
477
478
479#define QCOW2_OL_CACHED \
480 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
481 QCOW2_OL_INACTIVE_L1)
482
483
484#define QCOW2_OL_ALL \
485 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
486
487#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
488#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
489#define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
490
491#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
492
493#define INV_OFFSET (-1ULL)
494
495static inline bool has_data_file(BlockDriverState *bs)
496{
497 BDRVQcow2State *s = bs->opaque;
498 return (s->data_file != bs->file);
499}
500
501static inline bool data_file_is_raw(BlockDriverState *bs)
502{
503 BDRVQcow2State *s = bs->opaque;
504 return !!(s->autoclear_features & QCOW2_AUTOCLEAR_DATA_FILE_RAW);
505}
506
507static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
508{
509 return offset & ~(s->cluster_size - 1);
510}
511
512static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
513{
514 return offset & (s->cluster_size - 1);
515}
516
517static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
518{
519 return (size + (s->cluster_size - 1)) >> s->cluster_bits;
520}
521
522static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
523{
524 int shift = s->cluster_bits + s->l2_bits;
525 return (size + (1ULL << shift) - 1) >> shift;
526}
527
528static inline int offset_to_l1_index(BDRVQcow2State *s, uint64_t offset)
529{
530 return offset >> (s->l2_bits + s->cluster_bits);
531}
532
533static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
534{
535 return (offset >> s->cluster_bits) & (s->l2_size - 1);
536}
537
538static inline int offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset)
539{
540 return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
541}
542
543static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
544{
545 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
546}
547
548static inline QCow2ClusterType qcow2_get_cluster_type(BlockDriverState *bs,
549 uint64_t l2_entry)
550{
551 if (l2_entry & QCOW_OFLAG_COMPRESSED) {
552 return QCOW2_CLUSTER_COMPRESSED;
553 } else if (l2_entry & QCOW_OFLAG_ZERO) {
554 if (l2_entry & L2E_OFFSET_MASK) {
555 return QCOW2_CLUSTER_ZERO_ALLOC;
556 }
557 return QCOW2_CLUSTER_ZERO_PLAIN;
558 } else if (!(l2_entry & L2E_OFFSET_MASK)) {
559
560
561
562
563 if (has_data_file(bs) && (l2_entry & QCOW_OFLAG_COPIED)) {
564 return QCOW2_CLUSTER_NORMAL;
565 } else {
566 return QCOW2_CLUSTER_UNALLOCATED;
567 }
568 } else {
569 return QCOW2_CLUSTER_NORMAL;
570 }
571}
572
573
574static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
575{
576 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
577}
578
579static inline uint64_t l2meta_cow_start(QCowL2Meta *m)
580{
581 return m->offset + m->cow_start.offset;
582}
583
584static inline uint64_t l2meta_cow_end(QCowL2Meta *m)
585{
586 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
587}
588
589static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
590{
591 return r1 > r2 ? r1 - r2 : r2 - r1;
592}
593
594static inline
595uint32_t offset_to_reftable_index(BDRVQcow2State *s, uint64_t offset)
596{
597 return offset >> (s->refcount_block_bits + s->cluster_bits);
598}
599
600
601int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size,
602 int refcount_order, bool generous_increase,
603 uint64_t *refblock_count);
604
605int qcow2_mark_dirty(BlockDriverState *bs);
606int qcow2_mark_corrupt(BlockDriverState *bs);
607int qcow2_mark_consistent(BlockDriverState *bs);
608int qcow2_update_header(BlockDriverState *bs);
609
610void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
611 int64_t size, const char *message_format, ...)
612 GCC_FMT_ATTR(5, 6);
613
614int qcow2_validate_table(BlockDriverState *bs, uint64_t offset,
615 uint64_t entries, size_t entry_len,
616 int64_t max_size_bytes, const char *table_name,
617 Error **errp);
618
619
620int qcow2_refcount_init(BlockDriverState *bs);
621void qcow2_refcount_close(BlockDriverState *bs);
622
623int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
624 uint64_t *refcount);
625
626int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
627 uint64_t addend, bool decrease,
628 enum qcow2_discard_type type);
629
630int64_t qcow2_refcount_area(BlockDriverState *bs, uint64_t offset,
631 uint64_t additional_clusters, bool exact_size,
632 int new_refblock_index,
633 uint64_t new_refblock_offset);
634
635int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
636int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
637 int64_t nb_clusters);
638int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
639void qcow2_free_clusters(BlockDriverState *bs,
640 int64_t offset, int64_t size,
641 enum qcow2_discard_type type);
642void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
643 int nb_clusters, enum qcow2_discard_type type);
644
645int qcow2_update_snapshot_refcount(BlockDriverState *bs,
646 int64_t l1_table_offset, int l1_size, int addend);
647
648int coroutine_fn qcow2_flush_caches(BlockDriverState *bs);
649int coroutine_fn qcow2_write_caches(BlockDriverState *bs);
650int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
651 BdrvCheckMode fix);
652
653void qcow2_process_discards(BlockDriverState *bs, int ret);
654
655int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
656 int64_t size);
657int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
658 int64_t size, bool data_file);
659int qcow2_inc_refcounts_imrt(BlockDriverState *bs, BdrvCheckResult *res,
660 void **refcount_table,
661 int64_t *refcount_table_size,
662 int64_t offset, int64_t size);
663
664int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
665 BlockDriverAmendStatusCB *status_cb,
666 void *cb_opaque, Error **errp);
667int qcow2_shrink_reftable(BlockDriverState *bs);
668int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size);
669int qcow2_detect_metadata_preallocation(BlockDriverState *bs);
670
671
672int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
673 bool exact_size);
674int qcow2_shrink_l1_table(BlockDriverState *bs, uint64_t max_size);
675int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
676int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
677 uint8_t *buf, int nb_sectors, bool enc, Error **errp);
678
679int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
680 unsigned int *bytes, uint64_t *cluster_offset);
681int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
682 unsigned int *bytes, uint64_t *host_offset,
683 QCowL2Meta **m);
684int qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
685 uint64_t offset,
686 int compressed_size,
687 uint64_t *host_offset);
688
689int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
690void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m);
691int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset,
692 uint64_t bytes, enum qcow2_discard_type type,
693 bool full_discard);
694int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset,
695 uint64_t bytes, int flags);
696
697int qcow2_expand_zero_clusters(BlockDriverState *bs,
698 BlockDriverAmendStatusCB *status_cb,
699 void *cb_opaque);
700
701
702int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
703int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
704int qcow2_snapshot_delete(BlockDriverState *bs,
705 const char *snapshot_id,
706 const char *name,
707 Error **errp);
708int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
709int qcow2_snapshot_load_tmp(BlockDriverState *bs,
710 const char *snapshot_id,
711 const char *name,
712 Error **errp);
713
714void qcow2_free_snapshots(BlockDriverState *bs);
715int qcow2_read_snapshots(BlockDriverState *bs, Error **errp);
716int qcow2_write_snapshots(BlockDriverState *bs);
717
718int coroutine_fn qcow2_check_read_snapshot_table(BlockDriverState *bs,
719 BdrvCheckResult *result,
720 BdrvCheckMode fix);
721int coroutine_fn qcow2_check_fix_snapshot_table(BlockDriverState *bs,
722 BdrvCheckResult *result,
723 BdrvCheckMode fix);
724
725
726Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables,
727 unsigned table_size);
728int qcow2_cache_destroy(Qcow2Cache *c);
729
730void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
731int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
732int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
733int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
734 Qcow2Cache *dependency);
735void qcow2_cache_depends_on_flush(Qcow2Cache *c);
736
737void qcow2_cache_clean_unused(Qcow2Cache *c);
738int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
739
740int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
741 void **table);
742int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
743 void **table);
744void qcow2_cache_put(Qcow2Cache *c, void **table);
745void *qcow2_cache_is_table_offset(Qcow2Cache *c, uint64_t offset);
746void qcow2_cache_discard(Qcow2Cache *c, void *table);
747
748
749int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
750 void **refcount_table,
751 int64_t *refcount_table_size);
752bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, Error **errp);
753Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
754 Error **errp);
755int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
756int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp);
757void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs,
758 bool release_stored, Error **errp);
759int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp);
760bool qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs,
761 const char *name,
762 uint32_t granularity,
763 Error **errp);
764int qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs,
765 const char *name,
766 Error **errp);
767
768ssize_t coroutine_fn
769qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
770 const void *src, size_t src_size);
771ssize_t coroutine_fn
772qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
773 const void *src, size_t src_size);
774int coroutine_fn
775qcow2_co_encrypt(BlockDriverState *bs, uint64_t host_offset,
776 uint64_t guest_offset, void *buf, size_t len);
777int coroutine_fn
778qcow2_co_decrypt(BlockDriverState *bs, uint64_t host_offset,
779 uint64_t guest_offset, void *buf, size_t len);
780
781#endif
782