2 * Block driver for the QCOW version 2 format
4 * Copyright (c) 2004-2006 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
28 #include "crypto/block.h"
29 #include "qemu/coroutine.h"
32 //#define DEBUG_ALLOC2
35 #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
37 #define QCOW_CRYPT_NONE 0
38 #define QCOW_CRYPT_AES 1
39 #define QCOW_CRYPT_LUKS 2
41 #define QCOW_MAX_CRYPT_CLUSTERS 32
42 #define QCOW_MAX_SNAPSHOTS 65536
44 /* 8 MB refcount table is enough for 2 PB images at 64k cluster size
45 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
46 #define QCOW_MAX_REFTABLE_SIZE 0x800000
48 /* 32 MB L1 table is enough for 2 PB images at 64k cluster size
49 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
50 #define QCOW_MAX_L1_SIZE 0x2000000
52 /* Allow for an average of 1k per snapshot table entry, should be plenty of
53 * space for snapshot names and IDs */
54 #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
56 /* Bitmap header extension constraints */
57 #define QCOW2_MAX_BITMAPS 65535
58 #define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
60 /* indicate that the refcount of the referenced cluster is exactly one. */
61 #define QCOW_OFLAG_COPIED (1ULL << 63)
62 /* indicate that the cluster is compressed (they never have the copied flag) */
63 #define QCOW_OFLAG_COMPRESSED (1ULL << 62)
64 /* The cluster reads as all zeros */
65 #define QCOW_OFLAG_ZERO (1ULL << 0)
67 #define MIN_CLUSTER_BITS 9
68 #define MAX_CLUSTER_BITS 21
70 /* Must be at least 2 to cover COW */
71 #define MIN_L2_CACHE_SIZE 2 /* cache entries */
73 /* Must be at least 4 to cover all cases of refcount table growth */
74 #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */
76 /* Whichever is more */
77 #define DEFAULT_L2_CACHE_CLUSTERS 8 /* clusters */
78 #define DEFAULT_L2_CACHE_BYTE_SIZE 1048576 /* bytes */
80 #define DEFAULT_CLUSTER_SIZE 65536
83 #define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
84 #define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
85 #define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
86 #define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
87 #define QCOW2_OPT_OVERLAP "overlap-check"
88 #define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
89 #define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
90 #define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
91 #define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
92 #define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
93 #define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
94 #define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
95 #define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
96 #define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
97 #define QCOW2_OPT_CACHE_SIZE "cache-size"
98 #define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
99 #define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
100 #define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
101 #define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
103 typedef struct QCowHeader
{
106 uint64_t backing_file_offset
;
107 uint32_t backing_file_size
;
108 uint32_t cluster_bits
;
109 uint64_t size
; /* in bytes */
110 uint32_t crypt_method
;
111 uint32_t l1_size
; /* XXX: save number of clusters instead ? */
112 uint64_t l1_table_offset
;
113 uint64_t refcount_table_offset
;
114 uint32_t refcount_table_clusters
;
115 uint32_t nb_snapshots
;
116 uint64_t snapshots_offset
;
118 /* The following fields are only valid for version >= 3 */
119 uint64_t incompatible_features
;
120 uint64_t compatible_features
;
121 uint64_t autoclear_features
;
123 uint32_t refcount_order
;
124 uint32_t header_length
;
125 } QEMU_PACKED QCowHeader
;
127 typedef struct QEMU_PACKED QCowSnapshotHeader
{
128 /* header is 8 byte aligned */
129 uint64_t l1_table_offset
;
132 uint16_t id_str_size
;
138 uint64_t vm_clock_nsec
;
140 uint32_t vm_state_size
;
141 uint32_t extra_data_size
; /* for extension */
142 /* extra data follows */
145 } QCowSnapshotHeader
;
147 typedef struct QEMU_PACKED QCowSnapshotExtraData
{
148 uint64_t vm_state_size_large
;
150 } QCowSnapshotExtraData
;
153 typedef struct QCowSnapshot
{
154 uint64_t l1_table_offset
;
159 uint64_t vm_state_size
;
162 uint64_t vm_clock_nsec
;
166 typedef struct Qcow2Cache Qcow2Cache
;
168 typedef struct Qcow2CryptoHeaderExtension
{
171 } QEMU_PACKED Qcow2CryptoHeaderExtension
;
173 typedef struct Qcow2UnknownHeaderExtension
{
176 QLIST_ENTRY(Qcow2UnknownHeaderExtension
) next
;
178 } Qcow2UnknownHeaderExtension
;
181 QCOW2_FEAT_TYPE_INCOMPATIBLE
= 0,
182 QCOW2_FEAT_TYPE_COMPATIBLE
= 1,
183 QCOW2_FEAT_TYPE_AUTOCLEAR
= 2,
186 /* Incompatible feature bits */
188 QCOW2_INCOMPAT_DIRTY_BITNR
= 0,
189 QCOW2_INCOMPAT_CORRUPT_BITNR
= 1,
190 QCOW2_INCOMPAT_DIRTY
= 1 << QCOW2_INCOMPAT_DIRTY_BITNR
,
191 QCOW2_INCOMPAT_CORRUPT
= 1 << QCOW2_INCOMPAT_CORRUPT_BITNR
,
193 QCOW2_INCOMPAT_MASK
= QCOW2_INCOMPAT_DIRTY
194 | QCOW2_INCOMPAT_CORRUPT
,
197 /* Compatible feature bits */
199 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR
= 0,
200 QCOW2_COMPAT_LAZY_REFCOUNTS
= 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR
,
202 QCOW2_COMPAT_FEAT_MASK
= QCOW2_COMPAT_LAZY_REFCOUNTS
,
205 /* Autoclear feature bits */
207 QCOW2_AUTOCLEAR_BITMAPS_BITNR
= 0,
208 QCOW2_AUTOCLEAR_BITMAPS
= 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR
,
210 QCOW2_AUTOCLEAR_MASK
= QCOW2_AUTOCLEAR_BITMAPS
,
213 enum qcow2_discard_type
{
214 QCOW2_DISCARD_NEVER
= 0,
215 QCOW2_DISCARD_ALWAYS
,
216 QCOW2_DISCARD_REQUEST
,
217 QCOW2_DISCARD_SNAPSHOT
,
222 typedef struct Qcow2Feature
{
226 } QEMU_PACKED Qcow2Feature
;
228 typedef struct Qcow2DiscardRegion
{
229 BlockDriverState
*bs
;
232 QTAILQ_ENTRY(Qcow2DiscardRegion
) next
;
233 } Qcow2DiscardRegion
;
235 typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array
,
237 typedef void Qcow2SetRefcountFunc(void *refcount_array
,
238 uint64_t index
, uint64_t value
);
240 typedef struct Qcow2BitmapHeaderExt
{
243 uint64_t bitmap_directory_size
;
244 uint64_t bitmap_directory_offset
;
245 } QEMU_PACKED Qcow2BitmapHeaderExt
;
247 typedef struct BDRVQcow2State
{
255 int l1_vm_state_index
;
256 int refcount_block_bits
;
257 int refcount_block_size
;
260 uint64_t cluster_offset_mask
;
261 uint64_t l1_table_offset
;
264 Qcow2Cache
* l2_table_cache
;
265 Qcow2Cache
* refcount_block_cache
;
266 QEMUTimer
*cache_clean_timer
;
267 unsigned cache_clean_interval
;
269 uint8_t *cluster_cache
;
270 uint8_t *cluster_data
;
271 uint64_t cluster_cache_offset
;
272 QLIST_HEAD(QCowClusterAlloc
, QCowL2Meta
) cluster_allocs
;
274 uint64_t *refcount_table
;
275 uint64_t refcount_table_offset
;
276 uint32_t refcount_table_size
;
277 uint32_t max_refcount_table_index
; /* Last used entry in refcount_table */
278 uint64_t free_cluster_index
;
279 uint64_t free_byte_offset
;
283 Qcow2CryptoHeaderExtension crypto_header
; /* QCow2 header extension */
284 QCryptoBlockOpenOptions
*crypto_opts
; /* Disk encryption runtime options */
285 QCryptoBlock
*crypto
; /* Disk encryption format driver */
286 bool crypt_physical_offset
; /* Whether to use virtual or physical offset
287 for encryption initialization vector tweak */
288 uint32_t crypt_method_header
;
289 uint64_t snapshots_offset
;
291 unsigned int nb_snapshots
;
292 QCowSnapshot
*snapshots
;
295 uint64_t bitmap_directory_size
;
296 uint64_t bitmap_directory_offset
;
297 bool dirty_bitmaps_loaded
;
301 bool use_lazy_refcounts
;
304 uint64_t refcount_max
;
306 Qcow2GetRefcountFunc
*get_refcount
;
307 Qcow2SetRefcountFunc
*set_refcount
;
309 bool discard_passthrough
[QCOW2_DISCARD_MAX
];
311 int overlap_check
; /* bitmask of Qcow2MetadataOverlap values */
312 bool signaled_corruption
;
314 uint64_t incompatible_features
;
315 uint64_t compatible_features
;
316 uint64_t autoclear_features
;
318 size_t unknown_header_fields_size
;
319 void* unknown_header_fields
;
320 QLIST_HEAD(, Qcow2UnknownHeaderExtension
) unknown_header_ext
;
321 QTAILQ_HEAD (, Qcow2DiscardRegion
) discards
;
324 /* Backing file path and format as stored in the image (this is not the
325 * effective path/format, which may be the result of a runtime option
327 char *image_backing_file
;
328 char *image_backing_format
;
330 CoQueue compress_wait_queue
;
331 int nb_compress_threads
;
334 typedef struct Qcow2COWRegion
{
336 * Offset of the COW region in bytes from the start of the first cluster
337 * touched by the request.
341 /** Number of bytes to copy */
346 * Describes an in-flight (part of a) write request that writes to clusters
347 * that are not referenced in their L2 table yet.
349 typedef struct QCowL2Meta
351 /** Guest offset of the first newly allocated cluster */
354 /** Host offset of the first newly allocated cluster */
355 uint64_t alloc_offset
;
357 /** Number of newly allocated clusters */
360 /** Do not free the old clusters */
361 bool keep_old_clusters
;
364 * Requests that overlap with this allocation and wait to be restarted
365 * when the allocating request has completed.
367 CoQueue dependent_requests
;
370 * The COW Region between the start of the first allocated cluster and the
371 * area the guest actually writes to.
373 Qcow2COWRegion cow_start
;
376 * The COW Region between the area the guest actually writes to and the
377 * end of the last allocated cluster.
379 Qcow2COWRegion cow_end
;
382 * The I/O vector with the data from the actual guest write request.
383 * If non-NULL, this is meant to be merged together with the data
384 * from @cow_start and @cow_end into one single write operation.
386 QEMUIOVector
*data_qiov
;
388 /** Pointer to next L2Meta of the same write request */
389 struct QCowL2Meta
*next
;
391 QLIST_ENTRY(QCowL2Meta
) next_in_flight
;
394 typedef enum QCow2ClusterType
{
395 QCOW2_CLUSTER_UNALLOCATED
,
396 QCOW2_CLUSTER_ZERO_PLAIN
,
397 QCOW2_CLUSTER_ZERO_ALLOC
,
398 QCOW2_CLUSTER_NORMAL
,
399 QCOW2_CLUSTER_COMPRESSED
,
402 typedef enum QCow2MetadataOverlap
{
403 QCOW2_OL_MAIN_HEADER_BITNR
= 0,
404 QCOW2_OL_ACTIVE_L1_BITNR
= 1,
405 QCOW2_OL_ACTIVE_L2_BITNR
= 2,
406 QCOW2_OL_REFCOUNT_TABLE_BITNR
= 3,
407 QCOW2_OL_REFCOUNT_BLOCK_BITNR
= 4,
408 QCOW2_OL_SNAPSHOT_TABLE_BITNR
= 5,
409 QCOW2_OL_INACTIVE_L1_BITNR
= 6,
410 QCOW2_OL_INACTIVE_L2_BITNR
= 7,
412 QCOW2_OL_MAX_BITNR
= 8,
415 QCOW2_OL_MAIN_HEADER
= (1 << QCOW2_OL_MAIN_HEADER_BITNR
),
416 QCOW2_OL_ACTIVE_L1
= (1 << QCOW2_OL_ACTIVE_L1_BITNR
),
417 QCOW2_OL_ACTIVE_L2
= (1 << QCOW2_OL_ACTIVE_L2_BITNR
),
418 QCOW2_OL_REFCOUNT_TABLE
= (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR
),
419 QCOW2_OL_REFCOUNT_BLOCK
= (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR
),
420 QCOW2_OL_SNAPSHOT_TABLE
= (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR
),
421 QCOW2_OL_INACTIVE_L1
= (1 << QCOW2_OL_INACTIVE_L1_BITNR
),
422 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv
424 QCOW2_OL_INACTIVE_L2
= (1 << QCOW2_OL_INACTIVE_L2_BITNR
),
425 } QCow2MetadataOverlap
;
427 /* Perform all overlap checks which can be done in constant time */
428 #define QCOW2_OL_CONSTANT \
429 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
430 QCOW2_OL_SNAPSHOT_TABLE)
432 /* Perform all overlap checks which don't require disk access */
433 #define QCOW2_OL_CACHED \
434 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
435 QCOW2_OL_INACTIVE_L1)
437 /* Perform all overlap checks */
438 #define QCOW2_OL_ALL \
439 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
441 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
442 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
443 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
445 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
447 static inline int64_t start_of_cluster(BDRVQcow2State
*s
, int64_t offset
)
449 return offset
& ~(s
->cluster_size
- 1);
452 static inline int64_t offset_into_cluster(BDRVQcow2State
*s
, int64_t offset
)
454 return offset
& (s
->cluster_size
- 1);
457 static inline uint64_t size_to_clusters(BDRVQcow2State
*s
, uint64_t size
)
459 return (size
+ (s
->cluster_size
- 1)) >> s
->cluster_bits
;
462 static inline int64_t size_to_l1(BDRVQcow2State
*s
, int64_t size
)
464 int shift
= s
->cluster_bits
+ s
->l2_bits
;
465 return (size
+ (1ULL << shift
) - 1) >> shift
;
468 static inline int offset_to_l1_index(BDRVQcow2State
*s
, uint64_t offset
)
470 return offset
>> (s
->l2_bits
+ s
->cluster_bits
);
473 static inline int offset_to_l2_index(BDRVQcow2State
*s
, int64_t offset
)
475 return (offset
>> s
->cluster_bits
) & (s
->l2_size
- 1);
478 static inline int offset_to_l2_slice_index(BDRVQcow2State
*s
, int64_t offset
)
480 return (offset
>> s
->cluster_bits
) & (s
->l2_slice_size
- 1);
483 static inline int64_t qcow2_vm_state_offset(BDRVQcow2State
*s
)
485 return (int64_t)s
->l1_vm_state_index
<< (s
->cluster_bits
+ s
->l2_bits
);
488 static inline QCow2ClusterType
qcow2_get_cluster_type(uint64_t l2_entry
)
490 if (l2_entry
& QCOW_OFLAG_COMPRESSED
) {
491 return QCOW2_CLUSTER_COMPRESSED
;
492 } else if (l2_entry
& QCOW_OFLAG_ZERO
) {
493 if (l2_entry
& L2E_OFFSET_MASK
) {
494 return QCOW2_CLUSTER_ZERO_ALLOC
;
496 return QCOW2_CLUSTER_ZERO_PLAIN
;
497 } else if (!(l2_entry
& L2E_OFFSET_MASK
)) {
498 return QCOW2_CLUSTER_UNALLOCATED
;
500 return QCOW2_CLUSTER_NORMAL
;
504 /* Check whether refcounts are eager or lazy */
505 static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State
*s
)
507 return !(s
->incompatible_features
& QCOW2_INCOMPAT_DIRTY
);
510 static inline uint64_t l2meta_cow_start(QCowL2Meta
*m
)
512 return m
->offset
+ m
->cow_start
.offset
;
515 static inline uint64_t l2meta_cow_end(QCowL2Meta
*m
)
517 return m
->offset
+ m
->cow_end
.offset
+ m
->cow_end
.nb_bytes
;
520 static inline uint64_t refcount_diff(uint64_t r1
, uint64_t r2
)
522 return r1
> r2
? r1
- r2
: r2
- r1
;
526 uint32_t offset_to_reftable_index(BDRVQcow2State
*s
, uint64_t offset
)
528 return offset
>> (s
->refcount_block_bits
+ s
->cluster_bits
);
531 /* qcow2.c functions */
532 int64_t qcow2_refcount_metadata_size(int64_t clusters
, size_t cluster_size
,
533 int refcount_order
, bool generous_increase
,
534 uint64_t *refblock_count
);
536 int qcow2_mark_dirty(BlockDriverState
*bs
);
537 int qcow2_mark_corrupt(BlockDriverState
*bs
);
538 int qcow2_mark_consistent(BlockDriverState
*bs
);
539 int qcow2_update_header(BlockDriverState
*bs
);
541 void qcow2_signal_corruption(BlockDriverState
*bs
, bool fatal
, int64_t offset
,
542 int64_t size
, const char *message_format
, ...)
545 int qcow2_validate_table(BlockDriverState
*bs
, uint64_t offset
,
546 uint64_t entries
, size_t entry_len
,
547 int64_t max_size_bytes
, const char *table_name
,
550 /* qcow2-refcount.c functions */
551 int qcow2_refcount_init(BlockDriverState
*bs
);
552 void qcow2_refcount_close(BlockDriverState
*bs
);
554 int qcow2_get_refcount(BlockDriverState
*bs
, int64_t cluster_index
,
557 int qcow2_update_cluster_refcount(BlockDriverState
*bs
, int64_t cluster_index
,
558 uint64_t addend
, bool decrease
,
559 enum qcow2_discard_type type
);
561 int64_t qcow2_refcount_area(BlockDriverState
*bs
, uint64_t offset
,
562 uint64_t additional_clusters
, bool exact_size
,
563 int new_refblock_index
,
564 uint64_t new_refblock_offset
);
566 int64_t qcow2_alloc_clusters(BlockDriverState
*bs
, uint64_t size
);
567 int64_t qcow2_alloc_clusters_at(BlockDriverState
*bs
, uint64_t offset
,
568 int64_t nb_clusters
);
569 int64_t qcow2_alloc_bytes(BlockDriverState
*bs
, int size
);
570 void qcow2_free_clusters(BlockDriverState
*bs
,
571 int64_t offset
, int64_t size
,
572 enum qcow2_discard_type type
);
573 void qcow2_free_any_clusters(BlockDriverState
*bs
, uint64_t l2_entry
,
574 int nb_clusters
, enum qcow2_discard_type type
);
576 int qcow2_update_snapshot_refcount(BlockDriverState
*bs
,
577 int64_t l1_table_offset
, int l1_size
, int addend
);
579 int coroutine_fn
qcow2_flush_caches(BlockDriverState
*bs
);
580 int coroutine_fn
qcow2_write_caches(BlockDriverState
*bs
);
581 int qcow2_check_refcounts(BlockDriverState
*bs
, BdrvCheckResult
*res
,
584 void qcow2_process_discards(BlockDriverState
*bs
, int ret
);
586 int qcow2_check_metadata_overlap(BlockDriverState
*bs
, int ign
, int64_t offset
,
588 int qcow2_pre_write_overlap_check(BlockDriverState
*bs
, int ign
, int64_t offset
,
590 int qcow2_inc_refcounts_imrt(BlockDriverState
*bs
, BdrvCheckResult
*res
,
591 void **refcount_table
,
592 int64_t *refcount_table_size
,
593 int64_t offset
, int64_t size
);
595 int qcow2_change_refcount_order(BlockDriverState
*bs
, int refcount_order
,
596 BlockDriverAmendStatusCB
*status_cb
,
597 void *cb_opaque
, Error
**errp
);
598 int qcow2_shrink_reftable(BlockDriverState
*bs
);
599 int64_t qcow2_get_last_cluster(BlockDriverState
*bs
, int64_t size
);
601 /* qcow2-cluster.c functions */
602 int qcow2_grow_l1_table(BlockDriverState
*bs
, uint64_t min_size
,
604 int qcow2_shrink_l1_table(BlockDriverState
*bs
, uint64_t max_size
);
605 int qcow2_write_l1_entry(BlockDriverState
*bs
, int l1_index
);
606 int qcow2_decompress_cluster(BlockDriverState
*bs
, uint64_t cluster_offset
);
607 int qcow2_encrypt_sectors(BDRVQcow2State
*s
, int64_t sector_num
,
608 uint8_t *buf
, int nb_sectors
, bool enc
, Error
**errp
);
610 int qcow2_get_cluster_offset(BlockDriverState
*bs
, uint64_t offset
,
611 unsigned int *bytes
, uint64_t *cluster_offset
);
612 int qcow2_alloc_cluster_offset(BlockDriverState
*bs
, uint64_t offset
,
613 unsigned int *bytes
, uint64_t *host_offset
,
615 uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState
*bs
,
617 int compressed_size
);
619 int qcow2_alloc_cluster_link_l2(BlockDriverState
*bs
, QCowL2Meta
*m
);
620 void qcow2_alloc_cluster_abort(BlockDriverState
*bs
, QCowL2Meta
*m
);
621 int qcow2_cluster_discard(BlockDriverState
*bs
, uint64_t offset
,
622 uint64_t bytes
, enum qcow2_discard_type type
,
624 int qcow2_cluster_zeroize(BlockDriverState
*bs
, uint64_t offset
,
625 uint64_t bytes
, int flags
);
627 int qcow2_expand_zero_clusters(BlockDriverState
*bs
,
628 BlockDriverAmendStatusCB
*status_cb
,
631 /* qcow2-snapshot.c functions */
632 int qcow2_snapshot_create(BlockDriverState
*bs
, QEMUSnapshotInfo
*sn_info
);
633 int qcow2_snapshot_goto(BlockDriverState
*bs
, const char *snapshot_id
);
634 int qcow2_snapshot_delete(BlockDriverState
*bs
,
635 const char *snapshot_id
,
638 int qcow2_snapshot_list(BlockDriverState
*bs
, QEMUSnapshotInfo
**psn_tab
);
639 int qcow2_snapshot_load_tmp(BlockDriverState
*bs
,
640 const char *snapshot_id
,
644 void qcow2_free_snapshots(BlockDriverState
*bs
);
645 int qcow2_read_snapshots(BlockDriverState
*bs
);
647 /* qcow2-cache.c functions */
648 Qcow2Cache
*qcow2_cache_create(BlockDriverState
*bs
, int num_tables
,
649 unsigned table_size
);
650 int qcow2_cache_destroy(Qcow2Cache
*c
);
652 void qcow2_cache_entry_mark_dirty(Qcow2Cache
*c
, void *table
);
653 int qcow2_cache_flush(BlockDriverState
*bs
, Qcow2Cache
*c
);
654 int qcow2_cache_write(BlockDriverState
*bs
, Qcow2Cache
*c
);
655 int qcow2_cache_set_dependency(BlockDriverState
*bs
, Qcow2Cache
*c
,
656 Qcow2Cache
*dependency
);
657 void qcow2_cache_depends_on_flush(Qcow2Cache
*c
);
659 void qcow2_cache_clean_unused(Qcow2Cache
*c
);
660 int qcow2_cache_empty(BlockDriverState
*bs
, Qcow2Cache
*c
);
662 int qcow2_cache_get(BlockDriverState
*bs
, Qcow2Cache
*c
, uint64_t offset
,
664 int qcow2_cache_get_empty(BlockDriverState
*bs
, Qcow2Cache
*c
, uint64_t offset
,
666 void qcow2_cache_put(Qcow2Cache
*c
, void **table
);
667 void *qcow2_cache_is_table_offset(Qcow2Cache
*c
, uint64_t offset
);
668 void qcow2_cache_discard(Qcow2Cache
*c
, void *table
);
670 /* qcow2-bitmap.c functions */
671 int qcow2_check_bitmaps_refcounts(BlockDriverState
*bs
, BdrvCheckResult
*res
,
672 void **refcount_table
,
673 int64_t *refcount_table_size
);
674 bool qcow2_load_dirty_bitmaps(BlockDriverState
*bs
, Error
**errp
);
675 int qcow2_reopen_bitmaps_rw_hint(BlockDriverState
*bs
, bool *header_updated
,
677 int qcow2_reopen_bitmaps_rw(BlockDriverState
*bs
, Error
**errp
);
678 void qcow2_store_persistent_dirty_bitmaps(BlockDriverState
*bs
, Error
**errp
);
679 int qcow2_reopen_bitmaps_ro(BlockDriverState
*bs
, Error
**errp
);
680 bool qcow2_can_store_new_dirty_bitmap(BlockDriverState
*bs
,
682 uint32_t granularity
,
684 void qcow2_remove_persistent_dirty_bitmap(BlockDriverState
*bs
,