tests: virtio-9p: rename PCI configuration test
[qemu.git] / block / qcow2.h
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/cipher.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
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 #define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
100
101 typedef struct QCowHeader {
102 uint32_t magic;
103 uint32_t version;
104 uint64_t backing_file_offset;
105 uint32_t backing_file_size;
106 uint32_t cluster_bits;
107 uint64_t size; /* in bytes */
108 uint32_t crypt_method;
109 uint32_t l1_size; /* XXX: save number of clusters instead ? */
110 uint64_t l1_table_offset;
111 uint64_t refcount_table_offset;
112 uint32_t refcount_table_clusters;
113 uint32_t nb_snapshots;
114 uint64_t snapshots_offset;
115
116 /* The following fields are only valid for version >= 3 */
117 uint64_t incompatible_features;
118 uint64_t compatible_features;
119 uint64_t autoclear_features;
120
121 uint32_t refcount_order;
122 uint32_t header_length;
123 } QEMU_PACKED QCowHeader;
124
125 typedef struct QEMU_PACKED QCowSnapshotHeader {
126 /* header is 8 byte aligned */
127 uint64_t l1_table_offset;
128
129 uint32_t l1_size;
130 uint16_t id_str_size;
131 uint16_t name_size;
132
133 uint32_t date_sec;
134 uint32_t date_nsec;
135
136 uint64_t vm_clock_nsec;
137
138 uint32_t vm_state_size;
139 uint32_t extra_data_size; /* for extension */
140 /* extra data follows */
141 /* id_str follows */
142 /* name follows */
143 } QCowSnapshotHeader;
144
145 typedef struct QEMU_PACKED QCowSnapshotExtraData {
146 uint64_t vm_state_size_large;
147 uint64_t disk_size;
148 } QCowSnapshotExtraData;
149
150
151 typedef struct QCowSnapshot {
152 uint64_t l1_table_offset;
153 uint32_t l1_size;
154 char *id_str;
155 char *name;
156 uint64_t disk_size;
157 uint64_t vm_state_size;
158 uint32_t date_sec;
159 uint32_t date_nsec;
160 uint64_t vm_clock_nsec;
161 } QCowSnapshot;
162
163 struct Qcow2Cache;
164 typedef struct Qcow2Cache Qcow2Cache;
165
166 typedef struct Qcow2UnknownHeaderExtension {
167 uint32_t magic;
168 uint32_t len;
169 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
170 uint8_t data[];
171 } Qcow2UnknownHeaderExtension;
172
173 enum {
174 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0,
175 QCOW2_FEAT_TYPE_COMPATIBLE = 1,
176 QCOW2_FEAT_TYPE_AUTOCLEAR = 2,
177 };
178
179 /* Incompatible feature bits */
180 enum {
181 QCOW2_INCOMPAT_DIRTY_BITNR = 0,
182 QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
183 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
184 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
185
186 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
187 | QCOW2_INCOMPAT_CORRUPT,
188 };
189
190 /* Compatible feature bits */
191 enum {
192 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0,
193 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
194
195 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
196 };
197
198 enum qcow2_discard_type {
199 QCOW2_DISCARD_NEVER = 0,
200 QCOW2_DISCARD_ALWAYS,
201 QCOW2_DISCARD_REQUEST,
202 QCOW2_DISCARD_SNAPSHOT,
203 QCOW2_DISCARD_OTHER,
204 QCOW2_DISCARD_MAX
205 };
206
207 typedef struct Qcow2Feature {
208 uint8_t type;
209 uint8_t bit;
210 char name[46];
211 } QEMU_PACKED Qcow2Feature;
212
213 typedef struct Qcow2DiscardRegion {
214 BlockDriverState *bs;
215 uint64_t offset;
216 uint64_t bytes;
217 QTAILQ_ENTRY(Qcow2DiscardRegion) next;
218 } Qcow2DiscardRegion;
219
220 typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
221 uint64_t index);
222 typedef void Qcow2SetRefcountFunc(void *refcount_array,
223 uint64_t index, uint64_t value);
224
225 typedef struct BDRVQcow2State {
226 int cluster_bits;
227 int cluster_size;
228 int cluster_sectors;
229 int l2_bits;
230 int l2_size;
231 int l1_size;
232 int l1_vm_state_index;
233 int refcount_block_bits;
234 int refcount_block_size;
235 int csize_shift;
236 int csize_mask;
237 uint64_t cluster_offset_mask;
238 uint64_t l1_table_offset;
239 uint64_t *l1_table;
240
241 Qcow2Cache* l2_table_cache;
242 Qcow2Cache* refcount_block_cache;
243 QEMUTimer *cache_clean_timer;
244 unsigned cache_clean_interval;
245
246 uint8_t *cluster_cache;
247 uint8_t *cluster_data;
248 uint64_t cluster_cache_offset;
249 QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs;
250
251 uint64_t *refcount_table;
252 uint64_t refcount_table_offset;
253 uint32_t refcount_table_size;
254 uint64_t free_cluster_index;
255 uint64_t free_byte_offset;
256
257 CoMutex lock;
258
259 QCryptoCipher *cipher; /* current cipher, NULL if no key yet */
260 uint32_t crypt_method_header;
261 uint64_t snapshots_offset;
262 int snapshots_size;
263 unsigned int nb_snapshots;
264 QCowSnapshot *snapshots;
265
266 int flags;
267 int qcow_version;
268 bool use_lazy_refcounts;
269 int refcount_order;
270 int refcount_bits;
271 uint64_t refcount_max;
272
273 Qcow2GetRefcountFunc *get_refcount;
274 Qcow2SetRefcountFunc *set_refcount;
275
276 bool discard_passthrough[QCOW2_DISCARD_MAX];
277
278 int overlap_check; /* bitmask of Qcow2MetadataOverlap values */
279 bool signaled_corruption;
280
281 uint64_t incompatible_features;
282 uint64_t compatible_features;
283 uint64_t autoclear_features;
284
285 size_t unknown_header_fields_size;
286 void* unknown_header_fields;
287 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
288 QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
289 bool cache_discards;
290
291 /* Backing file path and format as stored in the image (this is not the
292 * effective path/format, which may be the result of a runtime option
293 * override) */
294 char *image_backing_file;
295 char *image_backing_format;
296 } BDRVQcow2State;
297
298 typedef struct Qcow2COWRegion {
299 /**
300 * Offset of the COW region in bytes from the start of the first cluster
301 * touched by the request.
302 */
303 uint64_t offset;
304
305 /** Number of bytes to copy */
306 int nb_bytes;
307 } Qcow2COWRegion;
308
309 /**
310 * Describes an in-flight (part of a) write request that writes to clusters
311 * that are not referenced in their L2 table yet.
312 */
313 typedef struct QCowL2Meta
314 {
315 /** Guest offset of the first newly allocated cluster */
316 uint64_t offset;
317
318 /** Host offset of the first newly allocated cluster */
319 uint64_t alloc_offset;
320
321 /** Number of newly allocated clusters */
322 int nb_clusters;
323
324 /**
325 * Requests that overlap with this allocation and wait to be restarted
326 * when the allocating request has completed.
327 */
328 CoQueue dependent_requests;
329
330 /**
331 * The COW Region between the start of the first allocated cluster and the
332 * area the guest actually writes to.
333 */
334 Qcow2COWRegion cow_start;
335
336 /**
337 * The COW Region between the area the guest actually writes to and the
338 * end of the last allocated cluster.
339 */
340 Qcow2COWRegion cow_end;
341
342 /** Pointer to next L2Meta of the same write request */
343 struct QCowL2Meta *next;
344
345 QLIST_ENTRY(QCowL2Meta) next_in_flight;
346 } QCowL2Meta;
347
348 enum {
349 QCOW2_CLUSTER_UNALLOCATED,
350 QCOW2_CLUSTER_NORMAL,
351 QCOW2_CLUSTER_COMPRESSED,
352 QCOW2_CLUSTER_ZERO
353 };
354
355 typedef enum QCow2MetadataOverlap {
356 QCOW2_OL_MAIN_HEADER_BITNR = 0,
357 QCOW2_OL_ACTIVE_L1_BITNR = 1,
358 QCOW2_OL_ACTIVE_L2_BITNR = 2,
359 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,
360 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,
361 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,
362 QCOW2_OL_INACTIVE_L1_BITNR = 6,
363 QCOW2_OL_INACTIVE_L2_BITNR = 7,
364
365 QCOW2_OL_MAX_BITNR = 8,
366
367 QCOW2_OL_NONE = 0,
368 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR),
369 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR),
370 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR),
371 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),
372 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),
373 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),
374 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR),
375 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv
376 * reads. */
377 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
378 } QCow2MetadataOverlap;
379
380 /* Perform all overlap checks which can be done in constant time */
381 #define QCOW2_OL_CONSTANT \
382 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
383 QCOW2_OL_SNAPSHOT_TABLE)
384
385 /* Perform all overlap checks which don't require disk access */
386 #define QCOW2_OL_CACHED \
387 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
388 QCOW2_OL_INACTIVE_L1)
389
390 /* Perform all overlap checks */
391 #define QCOW2_OL_ALL \
392 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
393
394 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
395 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
396 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
397
398 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
399
400 static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
401 {
402 return offset & ~(s->cluster_size - 1);
403 }
404
405 static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
406 {
407 return offset & (s->cluster_size - 1);
408 }
409
410 static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
411 {
412 return (size + (s->cluster_size - 1)) >> s->cluster_bits;
413 }
414
415 static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
416 {
417 int shift = s->cluster_bits + s->l2_bits;
418 return (size + (1ULL << shift) - 1) >> shift;
419 }
420
421 static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
422 {
423 return (offset >> s->cluster_bits) & (s->l2_size - 1);
424 }
425
426 static inline int64_t align_offset(int64_t offset, int n)
427 {
428 offset = (offset + n - 1) & ~(n - 1);
429 return offset;
430 }
431
432 static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
433 {
434 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
435 }
436
437 static inline uint64_t qcow2_max_refcount_clusters(BDRVQcow2State *s)
438 {
439 return QCOW_MAX_REFTABLE_SIZE >> s->cluster_bits;
440 }
441
442 static inline int qcow2_get_cluster_type(uint64_t l2_entry)
443 {
444 if (l2_entry & QCOW_OFLAG_COMPRESSED) {
445 return QCOW2_CLUSTER_COMPRESSED;
446 } else if (l2_entry & QCOW_OFLAG_ZERO) {
447 return QCOW2_CLUSTER_ZERO;
448 } else if (!(l2_entry & L2E_OFFSET_MASK)) {
449 return QCOW2_CLUSTER_UNALLOCATED;
450 } else {
451 return QCOW2_CLUSTER_NORMAL;
452 }
453 }
454
455 /* Check whether refcounts are eager or lazy */
456 static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
457 {
458 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
459 }
460
461 static inline uint64_t l2meta_cow_start(QCowL2Meta *m)
462 {
463 return m->offset + m->cow_start.offset;
464 }
465
466 static inline uint64_t l2meta_cow_end(QCowL2Meta *m)
467 {
468 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
469 }
470
471 static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
472 {
473 return r1 > r2 ? r1 - r2 : r2 - r1;
474 }
475
476 /* qcow2.c functions */
477 int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
478 int64_t sector_num, int nb_sectors);
479
480 int qcow2_mark_dirty(BlockDriverState *bs);
481 int qcow2_mark_corrupt(BlockDriverState *bs);
482 int qcow2_mark_consistent(BlockDriverState *bs);
483 int qcow2_update_header(BlockDriverState *bs);
484
485 void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
486 int64_t size, const char *message_format, ...)
487 GCC_FMT_ATTR(5, 6);
488
489 /* qcow2-refcount.c functions */
490 int qcow2_refcount_init(BlockDriverState *bs);
491 void qcow2_refcount_close(BlockDriverState *bs);
492
493 int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
494 uint64_t *refcount);
495
496 int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
497 uint64_t addend, bool decrease,
498 enum qcow2_discard_type type);
499
500 int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
501 int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
502 int64_t nb_clusters);
503 int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
504 void qcow2_free_clusters(BlockDriverState *bs,
505 int64_t offset, int64_t size,
506 enum qcow2_discard_type type);
507 void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
508 int nb_clusters, enum qcow2_discard_type type);
509
510 int qcow2_update_snapshot_refcount(BlockDriverState *bs,
511 int64_t l1_table_offset, int l1_size, int addend);
512
513 int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
514 BdrvCheckMode fix);
515
516 void qcow2_process_discards(BlockDriverState *bs, int ret);
517
518 int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
519 int64_t size);
520 int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
521 int64_t size);
522
523 int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
524 BlockDriverAmendStatusCB *status_cb,
525 void *cb_opaque, Error **errp);
526
527 /* qcow2-cluster.c functions */
528 int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
529 bool exact_size);
530 int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
531 int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
532 int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
533 uint8_t *out_buf, const uint8_t *in_buf,
534 int nb_sectors, bool enc, Error **errp);
535
536 int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
537 unsigned int *bytes, uint64_t *cluster_offset);
538 int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
539 unsigned int *bytes, uint64_t *host_offset,
540 QCowL2Meta **m);
541 uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
542 uint64_t offset,
543 int compressed_size);
544
545 int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
546 int qcow2_discard_clusters(BlockDriverState *bs, uint64_t offset,
547 int nb_sectors, enum qcow2_discard_type type, bool full_discard);
548 int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors,
549 int flags);
550
551 int qcow2_expand_zero_clusters(BlockDriverState *bs,
552 BlockDriverAmendStatusCB *status_cb,
553 void *cb_opaque);
554
555 /* qcow2-snapshot.c functions */
556 int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
557 int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
558 int qcow2_snapshot_delete(BlockDriverState *bs,
559 const char *snapshot_id,
560 const char *name,
561 Error **errp);
562 int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
563 int qcow2_snapshot_load_tmp(BlockDriverState *bs,
564 const char *snapshot_id,
565 const char *name,
566 Error **errp);
567
568 void qcow2_free_snapshots(BlockDriverState *bs);
569 int qcow2_read_snapshots(BlockDriverState *bs);
570
571 /* qcow2-cache.c functions */
572 Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
573 int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
574
575 void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c,
576 void *table);
577 int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
578 int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
579 int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
580 Qcow2Cache *dependency);
581 void qcow2_cache_depends_on_flush(Qcow2Cache *c);
582
583 void qcow2_cache_clean_unused(BlockDriverState *bs, Qcow2Cache *c);
584 int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
585
586 int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
587 void **table);
588 int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
589 void **table);
590 void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table);
591
592 #endif