spapr: Workaround for broken radix guests
[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 uint32_t max_refcount_table_index; /* Last used entry in refcount_table */
255 uint64_t free_cluster_index;
256 uint64_t free_byte_offset;
257
258 CoMutex lock;
259
260 QCryptoCipher *cipher; /* current cipher, NULL if no key yet */
261 uint32_t crypt_method_header;
262 uint64_t snapshots_offset;
263 int snapshots_size;
264 unsigned int nb_snapshots;
265 QCowSnapshot *snapshots;
266
267 int flags;
268 int qcow_version;
269 bool use_lazy_refcounts;
270 int refcount_order;
271 int refcount_bits;
272 uint64_t refcount_max;
273
274 Qcow2GetRefcountFunc *get_refcount;
275 Qcow2SetRefcountFunc *set_refcount;
276
277 bool discard_passthrough[QCOW2_DISCARD_MAX];
278
279 int overlap_check; /* bitmask of Qcow2MetadataOverlap values */
280 bool signaled_corruption;
281
282 uint64_t incompatible_features;
283 uint64_t compatible_features;
284 uint64_t autoclear_features;
285
286 size_t unknown_header_fields_size;
287 void* unknown_header_fields;
288 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
289 QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
290 bool cache_discards;
291
292 /* Backing file path and format as stored in the image (this is not the
293 * effective path/format, which may be the result of a runtime option
294 * override) */
295 char *image_backing_file;
296 char *image_backing_format;
297 } BDRVQcow2State;
298
299 typedef struct Qcow2COWRegion {
300 /**
301 * Offset of the COW region in bytes from the start of the first cluster
302 * touched by the request.
303 */
304 uint64_t offset;
305
306 /** Number of bytes to copy */
307 int nb_bytes;
308 } Qcow2COWRegion;
309
310 /**
311 * Describes an in-flight (part of a) write request that writes to clusters
312 * that are not referenced in their L2 table yet.
313 */
314 typedef struct QCowL2Meta
315 {
316 /** Guest offset of the first newly allocated cluster */
317 uint64_t offset;
318
319 /** Host offset of the first newly allocated cluster */
320 uint64_t alloc_offset;
321
322 /** Number of newly allocated clusters */
323 int nb_clusters;
324
325 /**
326 * Requests that overlap with this allocation and wait to be restarted
327 * when the allocating request has completed.
328 */
329 CoQueue dependent_requests;
330
331 /**
332 * The COW Region between the start of the first allocated cluster and the
333 * area the guest actually writes to.
334 */
335 Qcow2COWRegion cow_start;
336
337 /**
338 * The COW Region between the area the guest actually writes to and the
339 * end of the last allocated cluster.
340 */
341 Qcow2COWRegion cow_end;
342
343 /** Pointer to next L2Meta of the same write request */
344 struct QCowL2Meta *next;
345
346 QLIST_ENTRY(QCowL2Meta) next_in_flight;
347 } QCowL2Meta;
348
349 enum {
350 QCOW2_CLUSTER_UNALLOCATED,
351 QCOW2_CLUSTER_NORMAL,
352 QCOW2_CLUSTER_COMPRESSED,
353 QCOW2_CLUSTER_ZERO
354 };
355
356 typedef enum QCow2MetadataOverlap {
357 QCOW2_OL_MAIN_HEADER_BITNR = 0,
358 QCOW2_OL_ACTIVE_L1_BITNR = 1,
359 QCOW2_OL_ACTIVE_L2_BITNR = 2,
360 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,
361 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,
362 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,
363 QCOW2_OL_INACTIVE_L1_BITNR = 6,
364 QCOW2_OL_INACTIVE_L2_BITNR = 7,
365
366 QCOW2_OL_MAX_BITNR = 8,
367
368 QCOW2_OL_NONE = 0,
369 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR),
370 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR),
371 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR),
372 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),
373 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),
374 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),
375 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR),
376 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv
377 * reads. */
378 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
379 } QCow2MetadataOverlap;
380
381 /* Perform all overlap checks which can be done in constant time */
382 #define QCOW2_OL_CONSTANT \
383 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
384 QCOW2_OL_SNAPSHOT_TABLE)
385
386 /* Perform all overlap checks which don't require disk access */
387 #define QCOW2_OL_CACHED \
388 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
389 QCOW2_OL_INACTIVE_L1)
390
391 /* Perform all overlap checks */
392 #define QCOW2_OL_ALL \
393 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
394
395 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
396 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
397 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
398
399 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
400
401 static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
402 {
403 return offset & ~(s->cluster_size - 1);
404 }
405
406 static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
407 {
408 return offset & (s->cluster_size - 1);
409 }
410
411 static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
412 {
413 return (size + (s->cluster_size - 1)) >> s->cluster_bits;
414 }
415
416 static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
417 {
418 int shift = s->cluster_bits + s->l2_bits;
419 return (size + (1ULL << shift) - 1) >> shift;
420 }
421
422 static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
423 {
424 return (offset >> s->cluster_bits) & (s->l2_size - 1);
425 }
426
427 static inline int64_t align_offset(int64_t offset, int n)
428 {
429 offset = (offset + n - 1) & ~(n - 1);
430 return offset;
431 }
432
433 static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
434 {
435 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
436 }
437
438 static inline uint64_t qcow2_max_refcount_clusters(BDRVQcow2State *s)
439 {
440 return QCOW_MAX_REFTABLE_SIZE >> s->cluster_bits;
441 }
442
443 static inline int qcow2_get_cluster_type(uint64_t l2_entry)
444 {
445 if (l2_entry & QCOW_OFLAG_COMPRESSED) {
446 return QCOW2_CLUSTER_COMPRESSED;
447 } else if (l2_entry & QCOW_OFLAG_ZERO) {
448 return QCOW2_CLUSTER_ZERO;
449 } else if (!(l2_entry & L2E_OFFSET_MASK)) {
450 return QCOW2_CLUSTER_UNALLOCATED;
451 } else {
452 return QCOW2_CLUSTER_NORMAL;
453 }
454 }
455
456 /* Check whether refcounts are eager or lazy */
457 static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
458 {
459 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
460 }
461
462 static inline uint64_t l2meta_cow_start(QCowL2Meta *m)
463 {
464 return m->offset + m->cow_start.offset;
465 }
466
467 static inline uint64_t l2meta_cow_end(QCowL2Meta *m)
468 {
469 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
470 }
471
472 static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
473 {
474 return r1 > r2 ? r1 - r2 : r2 - r1;
475 }
476
477 /* qcow2.c functions */
478 int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
479 int64_t sector_num, int nb_sectors);
480
481 int qcow2_mark_dirty(BlockDriverState *bs);
482 int qcow2_mark_corrupt(BlockDriverState *bs);
483 int qcow2_mark_consistent(BlockDriverState *bs);
484 int qcow2_update_header(BlockDriverState *bs);
485
486 void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
487 int64_t size, const char *message_format, ...)
488 GCC_FMT_ATTR(5, 6);
489
490 /* qcow2-refcount.c functions */
491 int qcow2_refcount_init(BlockDriverState *bs);
492 void qcow2_refcount_close(BlockDriverState *bs);
493
494 int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
495 uint64_t *refcount);
496
497 int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
498 uint64_t addend, bool decrease,
499 enum qcow2_discard_type type);
500
501 int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
502 int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
503 int64_t nb_clusters);
504 int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
505 void qcow2_free_clusters(BlockDriverState *bs,
506 int64_t offset, int64_t size,
507 enum qcow2_discard_type type);
508 void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
509 int nb_clusters, enum qcow2_discard_type type);
510
511 int qcow2_update_snapshot_refcount(BlockDriverState *bs,
512 int64_t l1_table_offset, int l1_size, int addend);
513
514 int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
515 BdrvCheckMode fix);
516
517 void qcow2_process_discards(BlockDriverState *bs, int ret);
518
519 int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
520 int64_t size);
521 int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
522 int64_t size);
523
524 int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
525 BlockDriverAmendStatusCB *status_cb,
526 void *cb_opaque, Error **errp);
527
528 /* qcow2-cluster.c functions */
529 int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
530 bool exact_size);
531 int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
532 int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
533 int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
534 uint8_t *out_buf, const uint8_t *in_buf,
535 int nb_sectors, bool enc, Error **errp);
536
537 int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
538 unsigned int *bytes, uint64_t *cluster_offset);
539 int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
540 unsigned int *bytes, uint64_t *host_offset,
541 QCowL2Meta **m);
542 uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
543 uint64_t offset,
544 int compressed_size);
545
546 int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
547 int qcow2_discard_clusters(BlockDriverState *bs, uint64_t offset,
548 int nb_sectors, enum qcow2_discard_type type, bool full_discard);
549 int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors,
550 int flags);
551
552 int qcow2_expand_zero_clusters(BlockDriverState *bs,
553 BlockDriverAmendStatusCB *status_cb,
554 void *cb_opaque);
555
556 /* qcow2-snapshot.c functions */
557 int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
558 int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
559 int qcow2_snapshot_delete(BlockDriverState *bs,
560 const char *snapshot_id,
561 const char *name,
562 Error **errp);
563 int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
564 int qcow2_snapshot_load_tmp(BlockDriverState *bs,
565 const char *snapshot_id,
566 const char *name,
567 Error **errp);
568
569 void qcow2_free_snapshots(BlockDriverState *bs);
570 int qcow2_read_snapshots(BlockDriverState *bs);
571
572 /* qcow2-cache.c functions */
573 Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
574 int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
575
576 void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c,
577 void *table);
578 int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
579 int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
580 int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
581 Qcow2Cache *dependency);
582 void qcow2_cache_depends_on_flush(Qcow2Cache *c);
583
584 void qcow2_cache_clean_unused(BlockDriverState *bs, Qcow2Cache *c);
585 int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
586
587 int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
588 void **table);
589 int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
590 void **table);
591 void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table);
592
593 #endif