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"
30 #include "qemu/units.h"
33 //#define DEBUG_ALLOC2
36 #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
38 #define QCOW_CRYPT_NONE 0
39 #define QCOW_CRYPT_AES 1
40 #define QCOW_CRYPT_LUKS 2
42 #define QCOW_MAX_CRYPT_CLUSTERS 32
43 #define QCOW_MAX_SNAPSHOTS 65536
45 /* Field widths in qcow2 mean normal cluster offsets cannot reach
46 * 64PB; depending on cluster size, compressed clusters can have a
47 * smaller limit (64PB for up to 16k clusters, then ramps down to
48 * 512TB for 2M clusters). */
49 #define QCOW_MAX_CLUSTER_OFFSET ((1ULL << 56) - 1)
51 /* 8 MB refcount table is enough for 2 PB images at 64k cluster size
52 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
53 #define QCOW_MAX_REFTABLE_SIZE (8 * MiB)
55 /* 32 MB L1 table is enough for 2 PB images at 64k cluster size
56 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
57 #define QCOW_MAX_L1_SIZE (32 * MiB)
59 /* Allow for an average of 1k per snapshot table entry, should be plenty of
60 * space for snapshot names and IDs */
61 #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
63 /* Bitmap header extension constraints */
64 #define QCOW2_MAX_BITMAPS 65535
65 #define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
67 /* indicate that the refcount of the referenced cluster is exactly one. */
68 #define QCOW_OFLAG_COPIED (1ULL << 63)
69 /* indicate that the cluster is compressed (they never have the copied flag) */
70 #define QCOW_OFLAG_COMPRESSED (1ULL << 62)
71 /* The cluster reads as all zeros */
72 #define QCOW_OFLAG_ZERO (1ULL << 0)
74 #define MIN_CLUSTER_BITS 9
75 #define MAX_CLUSTER_BITS 21
77 /* Must be at least 2 to cover COW */
78 #define MIN_L2_CACHE_SIZE 2 /* cache entries */
80 /* Must be at least 4 to cover all cases of refcount table growth */
81 #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */
84 #define DEFAULT_L2_CACHE_MAX_SIZE (32 * MiB)
85 #define DEFAULT_CACHE_CLEAN_INTERVAL 600 /* seconds */
87 #define DEFAULT_L2_CACHE_MAX_SIZE (8 * MiB)
88 /* Cache clean interval is currently available only on Linux, so must be 0 */
89 #define DEFAULT_CACHE_CLEAN_INTERVAL 0
92 #define DEFAULT_CLUSTER_SIZE 65536
94 #define QCOW2_OPT_DATA_FILE "data-file"
95 #define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
96 #define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
97 #define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
98 #define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
99 #define QCOW2_OPT_OVERLAP "overlap-check"
100 #define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
101 #define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
102 #define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
103 #define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
104 #define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
105 #define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
106 #define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
107 #define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
108 #define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
109 #define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory"
110 #define QCOW2_OPT_CACHE_SIZE "cache-size"
111 #define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
112 #define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
113 #define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
114 #define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
116 typedef struct QCowHeader
{
119 uint64_t backing_file_offset
;
120 uint32_t backing_file_size
;
121 uint32_t cluster_bits
;
122 uint64_t size
; /* in bytes */
123 uint32_t crypt_method
;
124 uint32_t l1_size
; /* XXX: save number of clusters instead ? */
125 uint64_t l1_table_offset
;
126 uint64_t refcount_table_offset
;
127 uint32_t refcount_table_clusters
;
128 uint32_t nb_snapshots
;
129 uint64_t snapshots_offset
;
131 /* The following fields are only valid for version >= 3 */
132 uint64_t incompatible_features
;
133 uint64_t compatible_features
;
134 uint64_t autoclear_features
;
136 uint32_t refcount_order
;
137 uint32_t header_length
;
138 } QEMU_PACKED QCowHeader
;
140 typedef struct QEMU_PACKED QCowSnapshotHeader
{
141 /* header is 8 byte aligned */
142 uint64_t l1_table_offset
;
145 uint16_t id_str_size
;
151 uint64_t vm_clock_nsec
;
153 uint32_t vm_state_size
;
154 uint32_t extra_data_size
; /* for extension */
155 /* extra data follows */
158 } QCowSnapshotHeader
;
160 typedef struct QEMU_PACKED QCowSnapshotExtraData
{
161 uint64_t vm_state_size_large
;
163 } QCowSnapshotExtraData
;
166 typedef struct QCowSnapshot
{
167 uint64_t l1_table_offset
;
172 uint64_t vm_state_size
;
175 uint64_t vm_clock_nsec
;
179 typedef struct Qcow2Cache Qcow2Cache
;
181 typedef struct Qcow2CryptoHeaderExtension
{
184 } QEMU_PACKED Qcow2CryptoHeaderExtension
;
186 typedef struct Qcow2UnknownHeaderExtension
{
189 QLIST_ENTRY(Qcow2UnknownHeaderExtension
) next
;
191 } Qcow2UnknownHeaderExtension
;
194 QCOW2_FEAT_TYPE_INCOMPATIBLE
= 0,
195 QCOW2_FEAT_TYPE_COMPATIBLE
= 1,
196 QCOW2_FEAT_TYPE_AUTOCLEAR
= 2,
199 /* Incompatible feature bits */
201 QCOW2_INCOMPAT_DIRTY_BITNR
= 0,
202 QCOW2_INCOMPAT_CORRUPT_BITNR
= 1,
203 QCOW2_INCOMPAT_DATA_FILE_BITNR
= 2,
204 QCOW2_INCOMPAT_DIRTY
= 1 << QCOW2_INCOMPAT_DIRTY_BITNR
,
205 QCOW2_INCOMPAT_CORRUPT
= 1 << QCOW2_INCOMPAT_CORRUPT_BITNR
,
206 QCOW2_INCOMPAT_DATA_FILE
= 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR
,
208 QCOW2_INCOMPAT_MASK
= QCOW2_INCOMPAT_DIRTY
209 | QCOW2_INCOMPAT_CORRUPT
210 | QCOW2_INCOMPAT_DATA_FILE
,
213 /* Compatible feature bits */
215 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR
= 0,
216 QCOW2_COMPAT_LAZY_REFCOUNTS
= 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR
,
218 QCOW2_COMPAT_FEAT_MASK
= QCOW2_COMPAT_LAZY_REFCOUNTS
,
221 /* Autoclear feature bits */
223 QCOW2_AUTOCLEAR_BITMAPS_BITNR
= 0,
224 QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR
= 1,
225 QCOW2_AUTOCLEAR_BITMAPS
= 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR
,
226 QCOW2_AUTOCLEAR_DATA_FILE_RAW
= 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR
,
228 QCOW2_AUTOCLEAR_MASK
= QCOW2_AUTOCLEAR_BITMAPS
229 | QCOW2_AUTOCLEAR_DATA_FILE_RAW
,
232 enum qcow2_discard_type
{
233 QCOW2_DISCARD_NEVER
= 0,
234 QCOW2_DISCARD_ALWAYS
,
235 QCOW2_DISCARD_REQUEST
,
236 QCOW2_DISCARD_SNAPSHOT
,
241 typedef struct Qcow2Feature
{
245 } QEMU_PACKED Qcow2Feature
;
247 typedef struct Qcow2DiscardRegion
{
248 BlockDriverState
*bs
;
251 QTAILQ_ENTRY(Qcow2DiscardRegion
) next
;
252 } Qcow2DiscardRegion
;
254 typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array
,
256 typedef void Qcow2SetRefcountFunc(void *refcount_array
,
257 uint64_t index
, uint64_t value
);
259 typedef struct Qcow2BitmapHeaderExt
{
262 uint64_t bitmap_directory_size
;
263 uint64_t bitmap_directory_offset
;
264 } QEMU_PACKED Qcow2BitmapHeaderExt
;
266 typedef struct BDRVQcow2State
{
273 int l1_vm_state_index
;
274 int refcount_block_bits
;
275 int refcount_block_size
;
278 uint64_t cluster_offset_mask
;
279 uint64_t l1_table_offset
;
282 Qcow2Cache
* l2_table_cache
;
283 Qcow2Cache
* refcount_block_cache
;
284 QEMUTimer
*cache_clean_timer
;
285 unsigned cache_clean_interval
;
287 uint8_t *cluster_cache
;
288 uint8_t *cluster_data
;
289 uint64_t cluster_cache_offset
;
290 QLIST_HEAD(, QCowL2Meta
) cluster_allocs
;
292 uint64_t *refcount_table
;
293 uint64_t refcount_table_offset
;
294 uint32_t refcount_table_size
;
295 uint32_t max_refcount_table_index
; /* Last used entry in refcount_table */
296 uint64_t free_cluster_index
;
297 uint64_t free_byte_offset
;
301 Qcow2CryptoHeaderExtension crypto_header
; /* QCow2 header extension */
302 QCryptoBlockOpenOptions
*crypto_opts
; /* Disk encryption runtime options */
303 QCryptoBlock
*crypto
; /* Disk encryption format driver */
304 bool crypt_physical_offset
; /* Whether to use virtual or physical offset
305 for encryption initialization vector tweak */
306 uint32_t crypt_method_header
;
307 uint64_t snapshots_offset
;
309 unsigned int nb_snapshots
;
310 QCowSnapshot
*snapshots
;
313 uint64_t bitmap_directory_size
;
314 uint64_t bitmap_directory_offset
;
318 bool use_lazy_refcounts
;
321 uint64_t refcount_max
;
323 Qcow2GetRefcountFunc
*get_refcount
;
324 Qcow2SetRefcountFunc
*set_refcount
;
326 bool discard_passthrough
[QCOW2_DISCARD_MAX
];
328 int overlap_check
; /* bitmask of Qcow2MetadataOverlap values */
329 bool signaled_corruption
;
331 uint64_t incompatible_features
;
332 uint64_t compatible_features
;
333 uint64_t autoclear_features
;
335 size_t unknown_header_fields_size
;
336 void* unknown_header_fields
;
337 QLIST_HEAD(, Qcow2UnknownHeaderExtension
) unknown_header_ext
;
338 QTAILQ_HEAD (, Qcow2DiscardRegion
) discards
;
341 /* Backing file path and format as stored in the image (this is not the
342 * effective path/format, which may be the result of a runtime option
344 char *image_backing_file
;
345 char *image_backing_format
;
346 char *image_data_file
;
348 CoQueue compress_wait_queue
;
349 int nb_compress_threads
;
351 BdrvChild
*data_file
;
354 typedef struct Qcow2COWRegion
{
356 * Offset of the COW region in bytes from the start of the first cluster
357 * touched by the request.
361 /** Number of bytes to copy */
366 * Describes an in-flight (part of a) write request that writes to clusters
367 * that are not referenced in their L2 table yet.
369 typedef struct QCowL2Meta
371 /** Guest offset of the first newly allocated cluster */
374 /** Host offset of the first newly allocated cluster */
375 uint64_t alloc_offset
;
377 /** Number of newly allocated clusters */
380 /** Do not free the old clusters */
381 bool keep_old_clusters
;
384 * Requests that overlap with this allocation and wait to be restarted
385 * when the allocating request has completed.
387 CoQueue dependent_requests
;
390 * The COW Region between the start of the first allocated cluster and the
391 * area the guest actually writes to.
393 Qcow2COWRegion cow_start
;
396 * The COW Region between the area the guest actually writes to and the
397 * end of the last allocated cluster.
399 Qcow2COWRegion cow_end
;
402 * The I/O vector with the data from the actual guest write request.
403 * If non-NULL, this is meant to be merged together with the data
404 * from @cow_start and @cow_end into one single write operation.
406 QEMUIOVector
*data_qiov
;
408 /** Pointer to next L2Meta of the same write request */
409 struct QCowL2Meta
*next
;
411 QLIST_ENTRY(QCowL2Meta
) next_in_flight
;
414 typedef enum QCow2ClusterType
{
415 QCOW2_CLUSTER_UNALLOCATED
,
416 QCOW2_CLUSTER_ZERO_PLAIN
,
417 QCOW2_CLUSTER_ZERO_ALLOC
,
418 QCOW2_CLUSTER_NORMAL
,
419 QCOW2_CLUSTER_COMPRESSED
,
422 typedef enum QCow2MetadataOverlap
{
423 QCOW2_OL_MAIN_HEADER_BITNR
= 0,
424 QCOW2_OL_ACTIVE_L1_BITNR
= 1,
425 QCOW2_OL_ACTIVE_L2_BITNR
= 2,
426 QCOW2_OL_REFCOUNT_TABLE_BITNR
= 3,
427 QCOW2_OL_REFCOUNT_BLOCK_BITNR
= 4,
428 QCOW2_OL_SNAPSHOT_TABLE_BITNR
= 5,
429 QCOW2_OL_INACTIVE_L1_BITNR
= 6,
430 QCOW2_OL_INACTIVE_L2_BITNR
= 7,
431 QCOW2_OL_BITMAP_DIRECTORY_BITNR
= 8,
433 QCOW2_OL_MAX_BITNR
= 9,
436 QCOW2_OL_MAIN_HEADER
= (1 << QCOW2_OL_MAIN_HEADER_BITNR
),
437 QCOW2_OL_ACTIVE_L1
= (1 << QCOW2_OL_ACTIVE_L1_BITNR
),
438 QCOW2_OL_ACTIVE_L2
= (1 << QCOW2_OL_ACTIVE_L2_BITNR
),
439 QCOW2_OL_REFCOUNT_TABLE
= (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR
),
440 QCOW2_OL_REFCOUNT_BLOCK
= (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR
),
441 QCOW2_OL_SNAPSHOT_TABLE
= (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR
),
442 QCOW2_OL_INACTIVE_L1
= (1 << QCOW2_OL_INACTIVE_L1_BITNR
),
443 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv
445 QCOW2_OL_INACTIVE_L2
= (1 << QCOW2_OL_INACTIVE_L2_BITNR
),
446 QCOW2_OL_BITMAP_DIRECTORY
= (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR
),
447 } QCow2MetadataOverlap
;
449 /* Perform all overlap checks which can be done in constant time */
450 #define QCOW2_OL_CONSTANT \
451 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
452 QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY)
454 /* Perform all overlap checks which don't require disk access */
455 #define QCOW2_OL_CACHED \
456 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
457 QCOW2_OL_INACTIVE_L1)
459 /* Perform all overlap checks */
460 #define QCOW2_OL_ALL \
461 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
463 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
464 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
465 #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
467 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
469 #define INV_OFFSET (-1ULL)
471 static inline bool has_data_file(BlockDriverState
*bs
)
473 BDRVQcow2State
*s
= bs
->opaque
;
474 return (s
->data_file
!= bs
->file
);
477 static inline bool data_file_is_raw(BlockDriverState
*bs
)
479 BDRVQcow2State
*s
= bs
->opaque
;
480 return !!(s
->autoclear_features
& QCOW2_AUTOCLEAR_DATA_FILE_RAW
);
483 static inline int64_t start_of_cluster(BDRVQcow2State
*s
, int64_t offset
)
485 return offset
& ~(s
->cluster_size
- 1);
488 static inline int64_t offset_into_cluster(BDRVQcow2State
*s
, int64_t offset
)
490 return offset
& (s
->cluster_size
- 1);
493 static inline uint64_t size_to_clusters(BDRVQcow2State
*s
, uint64_t size
)
495 return (size
+ (s
->cluster_size
- 1)) >> s
->cluster_bits
;
498 static inline int64_t size_to_l1(BDRVQcow2State
*s
, int64_t size
)
500 int shift
= s
->cluster_bits
+ s
->l2_bits
;
501 return (size
+ (1ULL << shift
) - 1) >> shift
;
504 static inline int offset_to_l1_index(BDRVQcow2State
*s
, uint64_t offset
)
506 return offset
>> (s
->l2_bits
+ s
->cluster_bits
);
509 static inline int offset_to_l2_index(BDRVQcow2State
*s
, int64_t offset
)
511 return (offset
>> s
->cluster_bits
) & (s
->l2_size
- 1);
514 static inline int offset_to_l2_slice_index(BDRVQcow2State
*s
, int64_t offset
)
516 return (offset
>> s
->cluster_bits
) & (s
->l2_slice_size
- 1);
519 static inline int64_t qcow2_vm_state_offset(BDRVQcow2State
*s
)
521 return (int64_t)s
->l1_vm_state_index
<< (s
->cluster_bits
+ s
->l2_bits
);
524 static inline QCow2ClusterType
qcow2_get_cluster_type(BlockDriverState
*bs
,
527 if (l2_entry
& QCOW_OFLAG_COMPRESSED
) {
528 return QCOW2_CLUSTER_COMPRESSED
;
529 } else if (l2_entry
& QCOW_OFLAG_ZERO
) {
530 if (l2_entry
& L2E_OFFSET_MASK
) {
531 return QCOW2_CLUSTER_ZERO_ALLOC
;
533 return QCOW2_CLUSTER_ZERO_PLAIN
;
534 } else if (!(l2_entry
& L2E_OFFSET_MASK
)) {
535 /* Offset 0 generally means unallocated, but it is ambiguous with
536 * external data files because 0 is a valid offset there. However, all
537 * clusters in external data files always have refcount 1, so we can
538 * rely on QCOW_OFLAG_COPIED to disambiguate. */
539 if (has_data_file(bs
) && (l2_entry
& QCOW_OFLAG_COPIED
)) {
540 return QCOW2_CLUSTER_NORMAL
;
542 return QCOW2_CLUSTER_UNALLOCATED
;
545 return QCOW2_CLUSTER_NORMAL
;
549 /* Check whether refcounts are eager or lazy */
550 static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State
*s
)
552 return !(s
->incompatible_features
& QCOW2_INCOMPAT_DIRTY
);
555 static inline uint64_t l2meta_cow_start(QCowL2Meta
*m
)
557 return m
->offset
+ m
->cow_start
.offset
;
560 static inline uint64_t l2meta_cow_end(QCowL2Meta
*m
)
562 return m
->offset
+ m
->cow_end
.offset
+ m
->cow_end
.nb_bytes
;
565 static inline uint64_t refcount_diff(uint64_t r1
, uint64_t r2
)
567 return r1
> r2
? r1
- r2
: r2
- r1
;
571 uint32_t offset_to_reftable_index(BDRVQcow2State
*s
, uint64_t offset
)
573 return offset
>> (s
->refcount_block_bits
+ s
->cluster_bits
);
576 /* qcow2.c functions */
577 int64_t qcow2_refcount_metadata_size(int64_t clusters
, size_t cluster_size
,
578 int refcount_order
, bool generous_increase
,
579 uint64_t *refblock_count
);
581 int qcow2_mark_dirty(BlockDriverState
*bs
);
582 int qcow2_mark_corrupt(BlockDriverState
*bs
);
583 int qcow2_mark_consistent(BlockDriverState
*bs
);
584 int qcow2_update_header(BlockDriverState
*bs
);
586 void qcow2_signal_corruption(BlockDriverState
*bs
, bool fatal
, int64_t offset
,
587 int64_t size
, const char *message_format
, ...)
590 int qcow2_validate_table(BlockDriverState
*bs
, uint64_t offset
,
591 uint64_t entries
, size_t entry_len
,
592 int64_t max_size_bytes
, const char *table_name
,
595 /* qcow2-refcount.c functions */
596 int qcow2_refcount_init(BlockDriverState
*bs
);
597 void qcow2_refcount_close(BlockDriverState
*bs
);
599 int qcow2_get_refcount(BlockDriverState
*bs
, int64_t cluster_index
,
602 int qcow2_update_cluster_refcount(BlockDriverState
*bs
, int64_t cluster_index
,
603 uint64_t addend
, bool decrease
,
604 enum qcow2_discard_type type
);
606 int64_t qcow2_refcount_area(BlockDriverState
*bs
, uint64_t offset
,
607 uint64_t additional_clusters
, bool exact_size
,
608 int new_refblock_index
,
609 uint64_t new_refblock_offset
);
611 int64_t qcow2_alloc_clusters(BlockDriverState
*bs
, uint64_t size
);
612 int64_t qcow2_alloc_clusters_at(BlockDriverState
*bs
, uint64_t offset
,
613 int64_t nb_clusters
);
614 int64_t qcow2_alloc_bytes(BlockDriverState
*bs
, int size
);
615 void qcow2_free_clusters(BlockDriverState
*bs
,
616 int64_t offset
, int64_t size
,
617 enum qcow2_discard_type type
);
618 void qcow2_free_any_clusters(BlockDriverState
*bs
, uint64_t l2_entry
,
619 int nb_clusters
, enum qcow2_discard_type type
);
621 int qcow2_update_snapshot_refcount(BlockDriverState
*bs
,
622 int64_t l1_table_offset
, int l1_size
, int addend
);
624 int coroutine_fn
qcow2_flush_caches(BlockDriverState
*bs
);
625 int coroutine_fn
qcow2_write_caches(BlockDriverState
*bs
);
626 int qcow2_check_refcounts(BlockDriverState
*bs
, BdrvCheckResult
*res
,
629 void qcow2_process_discards(BlockDriverState
*bs
, int ret
);
631 int qcow2_check_metadata_overlap(BlockDriverState
*bs
, int ign
, int64_t offset
,
633 int qcow2_pre_write_overlap_check(BlockDriverState
*bs
, int ign
, int64_t offset
,
634 int64_t size
, bool data_file
);
635 int qcow2_inc_refcounts_imrt(BlockDriverState
*bs
, BdrvCheckResult
*res
,
636 void **refcount_table
,
637 int64_t *refcount_table_size
,
638 int64_t offset
, int64_t size
);
640 int qcow2_change_refcount_order(BlockDriverState
*bs
, int refcount_order
,
641 BlockDriverAmendStatusCB
*status_cb
,
642 void *cb_opaque
, Error
**errp
);
643 int qcow2_shrink_reftable(BlockDriverState
*bs
);
644 int64_t qcow2_get_last_cluster(BlockDriverState
*bs
, int64_t size
);
646 /* qcow2-cluster.c functions */
647 int qcow2_grow_l1_table(BlockDriverState
*bs
, uint64_t min_size
,
649 int qcow2_shrink_l1_table(BlockDriverState
*bs
, uint64_t max_size
);
650 int qcow2_write_l1_entry(BlockDriverState
*bs
, int l1_index
);
651 int qcow2_encrypt_sectors(BDRVQcow2State
*s
, int64_t sector_num
,
652 uint8_t *buf
, int nb_sectors
, bool enc
, Error
**errp
);
654 int qcow2_get_cluster_offset(BlockDriverState
*bs
, uint64_t offset
,
655 unsigned int *bytes
, uint64_t *cluster_offset
);
656 int qcow2_alloc_cluster_offset(BlockDriverState
*bs
, uint64_t offset
,
657 unsigned int *bytes
, uint64_t *host_offset
,
659 int qcow2_alloc_compressed_cluster_offset(BlockDriverState
*bs
,
662 uint64_t *host_offset
);
664 int qcow2_alloc_cluster_link_l2(BlockDriverState
*bs
, QCowL2Meta
*m
);
665 void qcow2_alloc_cluster_abort(BlockDriverState
*bs
, QCowL2Meta
*m
);
666 int qcow2_cluster_discard(BlockDriverState
*bs
, uint64_t offset
,
667 uint64_t bytes
, enum qcow2_discard_type type
,
669 int qcow2_cluster_zeroize(BlockDriverState
*bs
, uint64_t offset
,
670 uint64_t bytes
, int flags
);
672 int qcow2_expand_zero_clusters(BlockDriverState
*bs
,
673 BlockDriverAmendStatusCB
*status_cb
,
676 /* qcow2-snapshot.c functions */
677 int qcow2_snapshot_create(BlockDriverState
*bs
, QEMUSnapshotInfo
*sn_info
);
678 int qcow2_snapshot_goto(BlockDriverState
*bs
, const char *snapshot_id
);
679 int qcow2_snapshot_delete(BlockDriverState
*bs
,
680 const char *snapshot_id
,
683 int qcow2_snapshot_list(BlockDriverState
*bs
, QEMUSnapshotInfo
**psn_tab
);
684 int qcow2_snapshot_load_tmp(BlockDriverState
*bs
,
685 const char *snapshot_id
,
689 void qcow2_free_snapshots(BlockDriverState
*bs
);
690 int qcow2_read_snapshots(BlockDriverState
*bs
);
692 /* qcow2-cache.c functions */
693 Qcow2Cache
*qcow2_cache_create(BlockDriverState
*bs
, int num_tables
,
694 unsigned table_size
);
695 int qcow2_cache_destroy(Qcow2Cache
*c
);
697 void qcow2_cache_entry_mark_dirty(Qcow2Cache
*c
, void *table
);
698 int qcow2_cache_flush(BlockDriverState
*bs
, Qcow2Cache
*c
);
699 int qcow2_cache_write(BlockDriverState
*bs
, Qcow2Cache
*c
);
700 int qcow2_cache_set_dependency(BlockDriverState
*bs
, Qcow2Cache
*c
,
701 Qcow2Cache
*dependency
);
702 void qcow2_cache_depends_on_flush(Qcow2Cache
*c
);
704 void qcow2_cache_clean_unused(Qcow2Cache
*c
);
705 int qcow2_cache_empty(BlockDriverState
*bs
, Qcow2Cache
*c
);
707 int qcow2_cache_get(BlockDriverState
*bs
, Qcow2Cache
*c
, uint64_t offset
,
709 int qcow2_cache_get_empty(BlockDriverState
*bs
, Qcow2Cache
*c
, uint64_t offset
,
711 void qcow2_cache_put(Qcow2Cache
*c
, void **table
);
712 void *qcow2_cache_is_table_offset(Qcow2Cache
*c
, uint64_t offset
);
713 void qcow2_cache_discard(Qcow2Cache
*c
, void *table
);
715 /* qcow2-bitmap.c functions */
716 int qcow2_check_bitmaps_refcounts(BlockDriverState
*bs
, BdrvCheckResult
*res
,
717 void **refcount_table
,
718 int64_t *refcount_table_size
);
719 bool qcow2_load_dirty_bitmaps(BlockDriverState
*bs
, Error
**errp
);
720 Qcow2BitmapInfoList
*qcow2_get_bitmap_info_list(BlockDriverState
*bs
,
722 int qcow2_reopen_bitmaps_rw_hint(BlockDriverState
*bs
, bool *header_updated
,
724 int qcow2_reopen_bitmaps_rw(BlockDriverState
*bs
, Error
**errp
);
725 int qcow2_truncate_bitmaps_check(BlockDriverState
*bs
, Error
**errp
);
726 void qcow2_store_persistent_dirty_bitmaps(BlockDriverState
*bs
, Error
**errp
);
727 int qcow2_reopen_bitmaps_ro(BlockDriverState
*bs
, Error
**errp
);
728 bool qcow2_can_store_new_dirty_bitmap(BlockDriverState
*bs
,
730 uint32_t granularity
,
732 void qcow2_remove_persistent_dirty_bitmap(BlockDriverState
*bs
,