blob: fd48a89d452cd34919e8b2577fdb0e0f6d24755b [file] [log] [blame]
Kevin Wolff7d0fe02009-05-28 16:07:04 +02001/*
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
Daniel P. Berrangeb25b3872017-06-23 17:24:10 +010028#include "crypto/block.h"
Daniel P. Berrange10817bf2015-09-01 14:48:02 +010029#include "qemu/coroutine.h"
Leonid Blochb6a95c62018-09-26 19:04:41 +030030#include "qemu/units.h"
Vladimir Sementsov-Ogievskiy9353db42019-05-06 17:27:34 +030031#include "block/block_int.h"
Kevin Wolff7d0fe02009-05-28 16:07:04 +020032
Filip Navara14899cd2009-06-23 19:17:30 -050033//#define DEBUG_ALLOC
34//#define DEBUG_ALLOC2
35//#define DEBUG_EXT
36
Kevin Wolff7d0fe02009-05-28 16:07:04 +020037#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
Kevin Wolff7d0fe02009-05-28 16:07:04 +020038
39#define QCOW_CRYPT_NONE 0
40#define QCOW_CRYPT_AES 1
Daniel P. Berrange4652b8f2017-06-23 17:24:12 +010041#define QCOW_CRYPT_LUKS 2
Kevin Wolff7d0fe02009-05-28 16:07:04 +020042
43#define QCOW_MAX_CRYPT_CLUSTERS 32
Kevin Wolfce48f2f42014-03-26 13:05:45 +010044#define QCOW_MAX_SNAPSHOTS 65536
Kevin Wolff7d0fe02009-05-28 16:07:04 +020045
Eric Blake77d6a212018-11-13 17:03:18 -060046/* Field widths in qcow2 mean normal cluster offsets cannot reach
47 * 64PB; depending on cluster size, compressed clusters can have a
48 * smaller limit (64PB for up to 16k clusters, then ramps down to
49 * 512TB for 2M clusters). */
50#define QCOW_MAX_CLUSTER_OFFSET ((1ULL << 56) - 1)
51
Kevin Wolf2b5d5952014-03-26 13:05:50 +010052/* 8 MB refcount table is enough for 2 PB images at 64k cluster size
53 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
Markus Armbruster14632122019-01-11 20:14:01 +010054#define QCOW_MAX_REFTABLE_SIZE (8 * MiB)
Kevin Wolf2b5d5952014-03-26 13:05:50 +010055
Kevin Wolf6a83f8b2014-03-26 13:06:06 +010056/* 32 MB L1 table is enough for 2 PB images at 64k cluster size
57 * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
Markus Armbruster14632122019-01-11 20:14:01 +010058#define QCOW_MAX_L1_SIZE (32 * MiB)
Kevin Wolf6a83f8b2014-03-26 13:06:06 +010059
Kevin Wolf5dae6e32014-03-26 13:06:07 +010060/* Allow for an average of 1k per snapshot table entry, should be plenty of
61 * space for snapshot names and IDs */
62#define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
63
Max Reitzfcf9a6b2019-10-11 17:28:02 +020064/* Maximum amount of extra data per snapshot table entry to accept */
65#define QCOW_MAX_SNAPSHOT_EXTRA_DATA 1024
66
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +030067/* Bitmap header extension constraints */
68#define QCOW2_MAX_BITMAPS 65535
69#define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
70
Vladimir Sementsov-Ogievskiyd710cf52019-09-16 20:53:24 +030071/* Maximum of parallel sub-request per guest request */
72#define QCOW2_MAX_WORKERS 8
73
Kevin Wolff7d0fe02009-05-28 16:07:04 +020074/* indicate that the refcount of the referenced cluster is exactly one. */
Peter Maydell127c84e2013-08-23 17:35:45 +010075#define QCOW_OFLAG_COPIED (1ULL << 63)
Kevin Wolff7d0fe02009-05-28 16:07:04 +020076/* indicate that the cluster is compressed (they never have the copied flag) */
Peter Maydell127c84e2013-08-23 17:35:45 +010077#define QCOW_OFLAG_COMPRESSED (1ULL << 62)
Kevin Wolf6377af42012-03-16 15:02:38 +010078/* The cluster reads as all zeros */
Peter Maydell127c84e2013-08-23 17:35:45 +010079#define QCOW_OFLAG_ZERO (1ULL << 0)
Kevin Wolff7d0fe02009-05-28 16:07:04 +020080
Alberto Garciad0346b52020-07-10 18:12:51 +020081#define QCOW_EXTL2_SUBCLUSTERS_PER_CLUSTER 32
82
Alberto Garcia34905d82020-07-10 18:12:56 +020083/* The subcluster X [0..31] is allocated */
84#define QCOW_OFLAG_SUB_ALLOC(X) (1ULL << (X))
85/* The subcluster X [0..31] reads as zeroes */
86#define QCOW_OFLAG_SUB_ZERO(X) (QCOW_OFLAG_SUB_ALLOC(X) << 32)
87/* Subclusters [X, Y) (0 <= X <= Y <= 32) are allocated */
88#define QCOW_OFLAG_SUB_ALLOC_RANGE(X, Y) \
89 (QCOW_OFLAG_SUB_ALLOC(Y) - QCOW_OFLAG_SUB_ALLOC(X))
90/* Subclusters [X, Y) (0 <= X <= Y <= 32) read as zeroes */
91#define QCOW_OFLAG_SUB_ZERO_RANGE(X, Y) \
92 (QCOW_OFLAG_SUB_ALLOC_RANGE(X, Y) << 32)
93/* L2 entry bitmap with all allocation bits set */
94#define QCOW_L2_BITMAP_ALL_ALLOC (QCOW_OFLAG_SUB_ALLOC_RANGE(0, 32))
95/* L2 entry bitmap with all "read as zeroes" bits set */
96#define QCOW_L2_BITMAP_ALL_ZEROES (QCOW_OFLAG_SUB_ZERO_RANGE(0, 32))
97
Alberto Garciac8fd8552020-07-10 18:12:54 +020098/* Size of normal and extended L2 entries */
99#define L2E_SIZE_NORMAL (sizeof(uint64_t))
100#define L2E_SIZE_EXTENDED (sizeof(uint64_t) * 2)
101
Alberto Garcia02b1ecf2020-08-28 13:08:28 +0200102/* Size of L1 table entries */
103#define L1E_SIZE (sizeof(uint64_t))
104
105/* Size of reftable entries */
106#define REFTABLE_ENTRY_SIZE (sizeof(uint64_t))
107
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200108#define MIN_CLUSTER_BITS 9
Kevin Wolf80ee15a2009-09-15 12:30:43 +0200109#define MAX_CLUSTER_BITS 21
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200110
Alberto Garciab6c24692019-05-10 19:22:54 +0300111/* Defined in the qcow2 spec (compressed cluster descriptor) */
112#define QCOW2_COMPRESSED_SECTOR_SIZE 512U
Alberto Garciab6c24692019-05-10 19:22:54 +0300113
Max Reitz57e21662015-06-01 18:09:17 +0200114/* Must be at least 2 to cover COW */
Alberto Garcia1221fe62018-02-05 16:33:36 +0200115#define MIN_L2_CACHE_SIZE 2 /* cache entries */
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200116
Kevin Wolf29c1a732011-01-10 17:17:28 +0100117/* Must be at least 4 to cover all cases of refcount table growth */
Max Reitz440ba082014-08-18 22:07:31 +0200118#define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */
119
Leonid Bloch80668d02018-09-26 19:04:44 +0300120#ifdef CONFIG_LINUX
Markus Armbruster14632122019-01-11 20:14:01 +0100121#define DEFAULT_L2_CACHE_MAX_SIZE (32 * MiB)
Leonid Bloche957b502018-09-26 19:04:46 +0300122#define DEFAULT_CACHE_CLEAN_INTERVAL 600 /* seconds */
Leonid Bloch80668d02018-09-26 19:04:44 +0300123#else
Markus Armbruster14632122019-01-11 20:14:01 +0100124#define DEFAULT_L2_CACHE_MAX_SIZE (8 * MiB)
Leonid Bloche957b502018-09-26 19:04:46 +0300125/* Cache clean interval is currently available only on Linux, so must be 0 */
126#define DEFAULT_CACHE_CLEAN_INTERVAL 0
Leonid Bloch80668d02018-09-26 19:04:44 +0300127#endif
Max Reitz440ba082014-08-18 22:07:31 +0200128
Markus Armbruster14632122019-01-11 20:14:01 +0100129#define DEFAULT_CLUSTER_SIZE 65536
Kevin Wolf99cce9f2011-05-31 15:01:46 +0200130
Kevin Wolf0e8c08b2019-01-29 17:13:57 +0100131#define QCOW2_OPT_DATA_FILE "data-file"
Kevin Wolf64aa99d2013-07-17 14:45:34 +0200132#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
133#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
134#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
135#define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
Max Reitz05de7e82013-10-10 11:09:25 +0200136#define QCOW2_OPT_OVERLAP "overlap-check"
Max Reitzee42b5c2014-08-20 19:59:35 +0200137#define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
Max Reitz05de7e82013-10-10 11:09:25 +0200138#define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
139#define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
140#define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
141#define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
142#define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
143#define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
144#define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
145#define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
Vladimir Sementsov-Ogievskiy0e4e4312018-07-05 18:15:15 +0300146#define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory"
Max Reitz6c1c8d52014-08-18 22:07:33 +0200147#define QCOW2_OPT_CACHE_SIZE "cache-size"
148#define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
Alberto Garcia1221fe62018-02-05 16:33:36 +0200149#define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
Max Reitz6c1c8d52014-08-18 22:07:33 +0200150#define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
Alberto Garcia279621c2015-08-04 15:14:40 +0300151#define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
Kevin Wolfacdfb482013-03-18 13:08:10 +0100152
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200153typedef struct QCowHeader {
154 uint32_t magic;
155 uint32_t version;
156 uint64_t backing_file_offset;
157 uint32_t backing_file_size;
158 uint32_t cluster_bits;
159 uint64_t size; /* in bytes */
160 uint32_t crypt_method;
161 uint32_t l1_size; /* XXX: save number of clusters instead ? */
162 uint64_t l1_table_offset;
163 uint64_t refcount_table_offset;
164 uint32_t refcount_table_clusters;
165 uint32_t nb_snapshots;
166 uint64_t snapshots_offset;
Kevin Wolf6744cba2011-12-15 12:20:58 +0100167
168 /* The following fields are only valid for version >= 3 */
169 uint64_t incompatible_features;
170 uint64_t compatible_features;
171 uint64_t autoclear_features;
172
173 uint32_t refcount_order;
174 uint32_t header_length;
Denis Plotnikov572ad972020-05-07 11:25:18 +0300175
176 /* Additional fields */
177 uint8_t compression_type;
178
179 /* header must be a multiple of 8 */
180 uint8_t padding[7];
Jeff Codyc4217f62013-09-25 12:08:50 -0400181} QEMU_PACKED QCowHeader;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200182
Denis Plotnikov572ad972020-05-07 11:25:18 +0300183QEMU_BUILD_BUG_ON(!QEMU_IS_ALIGNED(sizeof(QCowHeader), 8));
184
Kevin Wolfce48f2f42014-03-26 13:05:45 +0100185typedef struct QEMU_PACKED QCowSnapshotHeader {
186 /* header is 8 byte aligned */
187 uint64_t l1_table_offset;
188
189 uint32_t l1_size;
190 uint16_t id_str_size;
191 uint16_t name_size;
192
193 uint32_t date_sec;
194 uint32_t date_nsec;
195
196 uint64_t vm_clock_nsec;
197
198 uint32_t vm_state_size;
199 uint32_t extra_data_size; /* for extension */
200 /* extra data follows */
201 /* id_str follows */
202 /* name follows */
203} QCowSnapshotHeader;
204
205typedef struct QEMU_PACKED QCowSnapshotExtraData {
206 uint64_t vm_state_size_large;
207 uint64_t disk_size;
Pavel Dovgalyukbbacffc2020-10-03 20:13:02 +0300208 uint64_t icount;
Kevin Wolfce48f2f42014-03-26 13:05:45 +0100209} QCowSnapshotExtraData;
210
211
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200212typedef struct QCowSnapshot {
213 uint64_t l1_table_offset;
214 uint32_t l1_size;
215 char *id_str;
216 char *name;
Kevin Wolf90b27752012-04-11 16:33:50 +0200217 uint64_t disk_size;
Kevin Wolfc2c9a462011-11-16 11:35:54 +0100218 uint64_t vm_state_size;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200219 uint32_t date_sec;
220 uint32_t date_nsec;
221 uint64_t vm_clock_nsec;
Pavel Dovgalyukbbacffc2020-10-03 20:13:02 +0300222 /* icount value for the moment when snapshot was taken */
223 uint64_t icount;
Max Reitzfcf9a6b2019-10-11 17:28:02 +0200224 /* Size of all extra data, including QCowSnapshotExtraData if available */
225 uint32_t extra_data_size;
226 /* Data beyond QCowSnapshotExtraData, if any */
227 void *unknown_extra_data;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200228} QCowSnapshot;
229
Kevin Wolf49381092011-01-10 17:15:10 +0100230struct Qcow2Cache;
231typedef struct Qcow2Cache Qcow2Cache;
232
Daniel P. Berrange4652b8f2017-06-23 17:24:12 +0100233typedef struct Qcow2CryptoHeaderExtension {
234 uint64_t offset;
235 uint64_t length;
236} QEMU_PACKED Qcow2CryptoHeaderExtension;
237
Kevin Wolf75bab852012-02-02 14:52:08 +0100238typedef struct Qcow2UnknownHeaderExtension {
239 uint32_t magic;
240 uint32_t len;
241 QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
242 uint8_t data[];
243} Qcow2UnknownHeaderExtension;
244
Kevin Wolfcfcc4c62012-04-12 15:20:27 +0200245enum {
246 QCOW2_FEAT_TYPE_INCOMPATIBLE = 0,
247 QCOW2_FEAT_TYPE_COMPATIBLE = 1,
248 QCOW2_FEAT_TYPE_AUTOCLEAR = 2,
249};
250
Stefan Hajnoczic61d0002012-07-27 09:05:19 +0100251/* Incompatible feature bits */
252enum {
Kevin Wolf93c24932019-01-14 16:48:25 +0100253 QCOW2_INCOMPAT_DIRTY_BITNR = 0,
254 QCOW2_INCOMPAT_CORRUPT_BITNR = 1,
255 QCOW2_INCOMPAT_DATA_FILE_BITNR = 2,
Denis Plotnikov572ad972020-05-07 11:25:18 +0300256 QCOW2_INCOMPAT_COMPRESSION_BITNR = 3,
Alberto Garcia7be20252020-07-10 18:13:13 +0200257 QCOW2_INCOMPAT_EXTL2_BITNR = 4,
Kevin Wolf93c24932019-01-14 16:48:25 +0100258 QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
259 QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
260 QCOW2_INCOMPAT_DATA_FILE = 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR,
Denis Plotnikov572ad972020-05-07 11:25:18 +0300261 QCOW2_INCOMPAT_COMPRESSION = 1 << QCOW2_INCOMPAT_COMPRESSION_BITNR,
Alberto Garcia7be20252020-07-10 18:13:13 +0200262 QCOW2_INCOMPAT_EXTL2 = 1 << QCOW2_INCOMPAT_EXTL2_BITNR,
Stefan Hajnoczic61d0002012-07-27 09:05:19 +0100263
Kevin Wolf93c24932019-01-14 16:48:25 +0100264 QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
Kevin Wolf0e8c08b2019-01-29 17:13:57 +0100265 | QCOW2_INCOMPAT_CORRUPT
Denis Plotnikov572ad972020-05-07 11:25:18 +0300266 | QCOW2_INCOMPAT_DATA_FILE
Alberto Garcia7be20252020-07-10 18:13:13 +0200267 | QCOW2_INCOMPAT_COMPRESSION
268 | QCOW2_INCOMPAT_EXTL2,
Stefan Hajnoczic61d0002012-07-27 09:05:19 +0100269};
270
Stefan Hajnoczibfe80432012-07-27 09:05:22 +0100271/* Compatible feature bits */
272enum {
273 QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0,
274 QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
275
276 QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS,
277};
278
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +0300279/* Autoclear feature bits */
280enum {
Kevin Wolf93c24932019-01-14 16:48:25 +0100281 QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0,
282 QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR = 1,
283 QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR,
284 QCOW2_AUTOCLEAR_DATA_FILE_RAW = 1 << QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR,
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +0300285
Kevin Wolf6c3944d2019-02-22 14:29:38 +0100286 QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS
287 | QCOW2_AUTOCLEAR_DATA_FILE_RAW,
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +0300288};
289
Kevin Wolf6cfcb9b2013-06-19 13:44:18 +0200290enum qcow2_discard_type {
291 QCOW2_DISCARD_NEVER = 0,
292 QCOW2_DISCARD_ALWAYS,
293 QCOW2_DISCARD_REQUEST,
294 QCOW2_DISCARD_SNAPSHOT,
295 QCOW2_DISCARD_OTHER,
296 QCOW2_DISCARD_MAX
297};
298
Kevin Wolfcfcc4c62012-04-12 15:20:27 +0200299typedef struct Qcow2Feature {
300 uint8_t type;
301 uint8_t bit;
302 char name[46];
303} QEMU_PACKED Qcow2Feature;
304
Kevin Wolf0b919fa2013-06-19 13:44:20 +0200305typedef struct Qcow2DiscardRegion {
306 BlockDriverState *bs;
307 uint64_t offset;
308 uint64_t bytes;
309 QTAILQ_ENTRY(Qcow2DiscardRegion) next;
310} Qcow2DiscardRegion;
311
Max Reitz7453c962015-02-10 15:28:50 -0500312typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array,
313 uint64_t index);
314typedef void Qcow2SetRefcountFunc(void *refcount_array,
315 uint64_t index, uint64_t value);
316
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +0300317typedef struct Qcow2BitmapHeaderExt {
318 uint32_t nb_bitmaps;
319 uint32_t reserved32;
320 uint64_t bitmap_directory_size;
321 uint64_t bitmap_directory_offset;
322} QEMU_PACKED Qcow2BitmapHeaderExt;
323
Vladimir Sementsov-Ogievskiy8ac0f152019-05-06 17:27:41 +0300324#define QCOW2_MAX_THREADS 4
325
Kevin Wolfff991292015-09-07 17:12:56 +0200326typedef struct BDRVQcow2State {
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200327 int cluster_bits;
328 int cluster_size;
Alberto Garcia3c2e5112018-02-05 16:33:13 +0200329 int l2_slice_size;
Alberto Garciad0346b52020-07-10 18:12:51 +0200330 int subcluster_bits;
331 int subcluster_size;
332 int subclusters_per_cluster;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200333 int l2_bits;
334 int l2_size;
335 int l1_size;
336 int l1_vm_state_index;
Max Reitz1d13d652014-10-22 14:09:28 +0200337 int refcount_block_bits;
338 int refcount_block_size;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200339 int csize_shift;
340 int csize_mask;
341 uint64_t cluster_offset_mask;
342 uint64_t l1_table_offset;
343 uint64_t *l1_table;
Kevin Wolf29c1a732011-01-10 17:17:28 +0100344
shiliyang5f14f312020-10-30 11:35:12 +0800345 Qcow2Cache *l2_table_cache;
346 Qcow2Cache *refcount_block_cache;
Alberto Garcia279621c2015-08-04 15:14:40 +0300347 QEMUTimer *cache_clean_timer;
348 unsigned cache_clean_interval;
Kevin Wolf29c1a732011-01-10 17:17:28 +0100349
Paolo Bonzinib58deb32018-12-06 11:58:10 +0100350 QLIST_HEAD(, QCowL2Meta) cluster_allocs;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200351
352 uint64_t *refcount_table;
353 uint64_t refcount_table_offset;
354 uint32_t refcount_table_size;
Alberto Garcia7061a072017-02-01 14:38:28 +0200355 uint32_t max_refcount_table_index; /* Last used entry in refcount_table */
Kevin Wolfbb572ae2014-03-26 13:05:51 +0100356 uint64_t free_cluster_index;
357 uint64_t free_byte_offset;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200358
Kevin Wolf68d100e2011-06-30 17:42:09 +0200359 CoMutex lock;
360
Daniel P. Berrange4652b8f2017-06-23 17:24:12 +0100361 Qcow2CryptoHeaderExtension crypto_header; /* QCow2 header extension */
Daniel P. Berrangeb25b3872017-06-23 17:24:10 +0100362 QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */
363 QCryptoBlock *crypto; /* Disk encryption format driver */
Daniel P. Berrange4652b8f2017-06-23 17:24:12 +0100364 bool crypt_physical_offset; /* Whether to use virtual or physical offset
365 for encryption initialization vector tweak */
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200366 uint32_t crypt_method_header;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200367 uint64_t snapshots_offset;
368 int snapshots_size;
Kevin Wolfce48f2f42014-03-26 13:05:45 +0100369 unsigned int nb_snapshots;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200370 QCowSnapshot *snapshots;
Anthony Liguori06d92602011-11-14 15:09:46 -0600371
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +0300372 uint32_t nb_bitmaps;
373 uint64_t bitmap_directory_size;
374 uint64_t bitmap_directory_offset;
375
Anthony Liguori06d92602011-11-14 15:09:46 -0600376 int flags;
Kevin Wolf6744cba2011-12-15 12:20:58 +0100377 int qcow_version;
Kevin Wolf74c45102013-03-15 10:35:08 +0100378 bool use_lazy_refcounts;
Max Reitzb6481f32013-09-03 10:09:53 +0200379 int refcount_order;
Max Reitz346a53d2015-02-10 15:28:43 -0500380 int refcount_bits;
381 uint64_t refcount_max;
Kevin Wolf6744cba2011-12-15 12:20:58 +0100382
Max Reitz7453c962015-02-10 15:28:50 -0500383 Qcow2GetRefcountFunc *get_refcount;
384 Qcow2SetRefcountFunc *set_refcount;
385
Kevin Wolf67af6742013-06-19 13:44:19 +0200386 bool discard_passthrough[QCOW2_DISCARD_MAX];
387
Max Reitz3e355392013-10-10 11:09:24 +0200388 int overlap_check; /* bitmask of Qcow2MetadataOverlap values */
Max Reitz85186eb2014-09-05 16:07:16 +0200389 bool signaled_corruption;
Max Reitz3e355392013-10-10 11:09:24 +0200390
Kevin Wolf6744cba2011-12-15 12:20:58 +0100391 uint64_t incompatible_features;
392 uint64_t compatible_features;
393 uint64_t autoclear_features;
394
395 size_t unknown_header_fields_size;
shiliyang5f14f312020-10-30 11:35:12 +0800396 void *unknown_header_fields;
Kevin Wolf75bab852012-02-02 14:52:08 +0100397 QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
Kevin Wolf0b919fa2013-06-19 13:44:20 +0200398 QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
399 bool cache_discards;
Kevin Wolfe4603fe2015-04-07 15:03:16 +0200400
401 /* Backing file path and format as stored in the image (this is not the
402 * effective path/format, which may be the result of a runtime option
403 * override) */
404 char *image_backing_file;
405 char *image_backing_format;
Kevin Wolf9b890bd2019-01-15 19:02:40 +0100406 char *image_data_file;
Vladimir Sementsov-Ogievskiyceb029c2018-06-20 17:48:37 +0300407
Vladimir Sementsov-Ogievskiy6f13a312019-05-06 17:27:38 +0300408 CoQueue thread_task_queue;
409 int nb_threads;
Kevin Wolf93c24932019-01-14 16:48:25 +0100410
411 BdrvChild *data_file;
Vladimir Sementsov-Ogievskiy69f47502019-04-08 19:26:17 +0300412
413 bool metadata_preallocation_checked;
414 bool metadata_preallocation;
Denis Plotnikov572ad972020-05-07 11:25:18 +0300415 /*
416 * Compression type used for the image. Default: 0 - ZLIB
417 * The image compression type is set on image creation.
418 * For now, the only way to change the compression type
419 * is to convert the image with the desired compression type set.
420 */
421 Qcow2CompressionType compression_type;
Kevin Wolfff991292015-09-07 17:12:56 +0200422} BDRVQcow2State;
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200423
Kevin Wolf593fb832012-12-07 18:08:43 +0100424typedef struct Qcow2COWRegion {
425 /**
426 * Offset of the COW region in bytes from the start of the first cluster
427 * touched by the request.
428 */
Alberto Garciae034f5b2017-06-19 16:40:03 +0300429 unsigned offset;
Kevin Wolf593fb832012-12-07 18:08:43 +0100430
Kevin Wolf85567392016-06-01 14:08:56 +0200431 /** Number of bytes to copy */
Alberto Garciae034f5b2017-06-19 16:40:03 +0300432 unsigned nb_bytes;
Kevin Wolf593fb832012-12-07 18:08:43 +0100433} Qcow2COWRegion;
434
Kevin Wolff50f88b2012-12-07 18:08:46 +0100435/**
436 * Describes an in-flight (part of a) write request that writes to clusters
Alberto Garcia3441ad42020-10-07 18:13:23 +0200437 * that need to have their L2 table entries updated (because they are
438 * newly allocated or need changes in their L2 bitmaps)
Kevin Wolff50f88b2012-12-07 18:08:46 +0100439 */
Kevin Wolf45aba422009-05-28 16:07:05 +0200440typedef struct QCowL2Meta
441{
Alberto Garcia3441ad42020-10-07 18:13:23 +0200442 /** Guest offset of the first updated cluster */
Kevin Wolf45aba422009-05-28 16:07:05 +0200443 uint64_t offset;
Kevin Wolf1d3afd62012-12-07 18:08:42 +0100444
Alberto Garcia3441ad42020-10-07 18:13:23 +0200445 /** Host offset of the first updated cluster */
Kevin Wolf250196f2012-03-02 14:10:54 +0100446 uint64_t alloc_offset;
Kevin Wolf1d3afd62012-12-07 18:08:42 +0100447
Alberto Garcia3441ad42020-10-07 18:13:23 +0200448 /** Number of updated clusters */
Kevin Wolf45aba422009-05-28 16:07:05 +0200449 int nb_clusters;
Kevin Wolf1d3afd62012-12-07 18:08:42 +0100450
Max Reitz564a6b62017-05-04 01:11:18 +0200451 /** Do not free the old clusters */
452 bool keep_old_clusters;
453
Kevin Wolf1d3afd62012-12-07 18:08:42 +0100454 /**
455 * Requests that overlap with this allocation and wait to be restarted
456 * when the allocating request has completed.
457 */
Kevin Wolf68d100e2011-06-30 17:42:09 +0200458 CoQueue dependent_requests;
Kevin Wolff2149782009-08-31 16:48:49 +0200459
Kevin Wolf593fb832012-12-07 18:08:43 +0100460 /**
Alberto Garcia3441ad42020-10-07 18:13:23 +0200461 * The COW Region immediately before the area the guest actually
462 * writes to. This (part of the) write request starts at
463 * cow_start.offset + cow_start.nb_bytes.
Kevin Wolf593fb832012-12-07 18:08:43 +0100464 */
465 Qcow2COWRegion cow_start;
466
467 /**
Alberto Garcia3441ad42020-10-07 18:13:23 +0200468 * The COW Region immediately after the area the guest actually
469 * writes to. This (part of the) write request ends at cow_end.offset
470 * (which must always be set even when cow_end.nb_bytes is 0).
Kevin Wolf593fb832012-12-07 18:08:43 +0100471 */
472 Qcow2COWRegion cow_end;
473
Anton Nefedovc8bb23c2019-05-16 17:27:49 +0300474 /*
475 * Indicates that COW regions are already handled and do not require
476 * any more processing.
477 */
478 bool skip_cow;
479
Alberto Garciaee22a9d2017-06-19 16:40:08 +0300480 /**
Alberto Garcia40dee942020-07-10 18:13:12 +0200481 * Indicates that this is not a normal write request but a preallocation.
482 * If the image has extended L2 entries this means that no new individual
483 * subclusters will be marked as allocated in the L2 bitmap (but any
484 * existing contents of that bitmap will be kept).
485 */
486 bool prealloc;
487
488 /**
Alberto Garciaee22a9d2017-06-19 16:40:08 +0300489 * The I/O vector with the data from the actual guest write request.
490 * If non-NULL, this is meant to be merged together with the data
491 * from @cow_start and @cow_end into one single write operation.
492 */
493 QEMUIOVector *data_qiov;
Vladimir Sementsov-Ogievskiy53962342019-06-04 19:15:14 +0300494 size_t data_qiov_offset;
Alberto Garciaee22a9d2017-06-19 16:40:08 +0300495
Kevin Wolf88c65882013-03-26 17:50:11 +0100496 /** Pointer to next L2Meta of the same write request */
497 struct QCowL2Meta *next;
498
Blue Swirl72cf2d42009-09-12 07:36:22 +0000499 QLIST_ENTRY(QCowL2Meta) next_in_flight;
Kevin Wolf45aba422009-05-28 16:07:05 +0200500} QCowL2Meta;
501
Alberto Garcia34905d82020-07-10 18:12:56 +0200502/*
503 * In images with standard L2 entries all clusters are treated as if
504 * they had one subcluster so QCow2ClusterType and QCow2SubclusterType
505 * can be mapped to each other and have the exact same meaning
506 * (QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC cannot happen in these images).
507 *
508 * In images with extended L2 entries QCow2ClusterType refers to the
509 * complete cluster and QCow2SubclusterType to each of the individual
510 * subclusters, so there are several possible combinations:
511 *
512 * |--------------+---------------------------|
513 * | Cluster type | Possible subcluster types |
514 * |--------------+---------------------------|
515 * | UNALLOCATED | UNALLOCATED_PLAIN |
516 * | | ZERO_PLAIN |
517 * |--------------+---------------------------|
518 * | NORMAL | UNALLOCATED_ALLOC |
519 * | | ZERO_ALLOC |
520 * | | NORMAL |
521 * |--------------+---------------------------|
522 * | COMPRESSED | COMPRESSED |
523 * |--------------+---------------------------|
524 *
525 * QCOW2_SUBCLUSTER_INVALID means that the L2 entry is incorrect and
526 * the image should be marked corrupt.
527 */
528
Eric Blake3ef95212017-05-06 19:05:45 -0500529typedef enum QCow2ClusterType {
Kevin Wolf68d000a2012-03-14 19:15:03 +0100530 QCOW2_CLUSTER_UNALLOCATED,
Eric Blakefdfab372017-05-06 19:05:46 -0500531 QCOW2_CLUSTER_ZERO_PLAIN,
532 QCOW2_CLUSTER_ZERO_ALLOC,
Kevin Wolf68d000a2012-03-14 19:15:03 +0100533 QCOW2_CLUSTER_NORMAL,
534 QCOW2_CLUSTER_COMPRESSED,
Eric Blake3ef95212017-05-06 19:05:45 -0500535} QCow2ClusterType;
Kevin Wolf68d000a2012-03-14 19:15:03 +0100536
Alberto Garcia34905d82020-07-10 18:12:56 +0200537typedef enum QCow2SubclusterType {
538 QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN,
539 QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC,
540 QCOW2_SUBCLUSTER_ZERO_PLAIN,
541 QCOW2_SUBCLUSTER_ZERO_ALLOC,
542 QCOW2_SUBCLUSTER_NORMAL,
543 QCOW2_SUBCLUSTER_COMPRESSED,
544 QCOW2_SUBCLUSTER_INVALID,
545} QCow2SubclusterType;
546
Max Reitza40f1c22013-08-30 14:34:25 +0200547typedef enum QCow2MetadataOverlap {
Vladimir Sementsov-Ogievskiy0e4e4312018-07-05 18:15:15 +0300548 QCOW2_OL_MAIN_HEADER_BITNR = 0,
549 QCOW2_OL_ACTIVE_L1_BITNR = 1,
550 QCOW2_OL_ACTIVE_L2_BITNR = 2,
551 QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,
552 QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,
553 QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,
554 QCOW2_OL_INACTIVE_L1_BITNR = 6,
555 QCOW2_OL_INACTIVE_L2_BITNR = 7,
556 QCOW2_OL_BITMAP_DIRECTORY_BITNR = 8,
Max Reitza40f1c22013-08-30 14:34:25 +0200557
Vladimir Sementsov-Ogievskiy0e4e4312018-07-05 18:15:15 +0300558 QCOW2_OL_MAX_BITNR = 9,
Max Reitza40f1c22013-08-30 14:34:25 +0200559
Vladimir Sementsov-Ogievskiy0e4e4312018-07-05 18:15:15 +0300560 QCOW2_OL_NONE = 0,
561 QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR),
562 QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR),
563 QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR),
564 QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),
565 QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),
566 QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),
567 QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR),
Max Reitza40f1c22013-08-30 14:34:25 +0200568 /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv
569 * reads. */
Vladimir Sementsov-Ogievskiy0e4e4312018-07-05 18:15:15 +0300570 QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
571 QCOW2_OL_BITMAP_DIRECTORY = (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR),
Max Reitza40f1c22013-08-30 14:34:25 +0200572} QCow2MetadataOverlap;
573
Max Reitz4a273c32013-10-10 11:09:27 +0200574/* Perform all overlap checks which can be done in constant time */
575#define QCOW2_OL_CONSTANT \
576 (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
Vladimir Sementsov-Ogievskiy0e4e4312018-07-05 18:15:15 +0300577 QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY)
Max Reitz4a273c32013-10-10 11:09:27 +0200578
Max Reitza40f1c22013-08-30 14:34:25 +0200579/* Perform all overlap checks which don't require disk access */
580#define QCOW2_OL_CACHED \
Max Reitz4a273c32013-10-10 11:09:27 +0200581 (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
582 QCOW2_OL_INACTIVE_L1)
583
584/* Perform all overlap checks */
585#define QCOW2_OL_ALL \
586 (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
Max Reitza40f1c22013-08-30 14:34:25 +0200587
Hu Tao46bae922014-01-21 11:30:02 +0800588#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
Vladimir Sementsov-Ogievskiy98bc07d2021-09-14 15:24:53 +0300589#define L1E_RESERVED_MASK 0x7f000000000001ffULL
Hu Tao46bae922014-01-21 11:30:02 +0800590#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
Vladimir Sementsov-Ogievskiy289ef5f2021-09-14 15:24:51 +0300591#define L2E_STD_RESERVED_MASK 0x3f000000000001feULL
Kevin Wolf68d000a2012-03-14 19:15:03 +0100592
Hu Tao46bae922014-01-21 11:30:02 +0800593#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
Vladimir Sementsov-Ogievskiy8fba3952021-09-14 15:24:54 +0300594#define REFT_RESERVED_MASK 0x1ffULL
Kevin Wolf76dc9e02012-03-16 14:09:08 +0100595
Kevin Wolfc6d619c2019-01-18 14:40:36 +0100596#define INV_OFFSET (-1ULL)
597
Alberto Garciaa3c7d912020-07-10 18:12:50 +0200598static inline bool has_subclusters(BDRVQcow2State *s)
599{
Alberto Garcia7be20252020-07-10 18:13:13 +0200600 return s->incompatible_features & QCOW2_INCOMPAT_EXTL2;
Alberto Garciaa3c7d912020-07-10 18:12:50 +0200601}
602
Alberto Garciac8fd8552020-07-10 18:12:54 +0200603static inline size_t l2_entry_size(BDRVQcow2State *s)
604{
605 return has_subclusters(s) ? L2E_SIZE_EXTENDED : L2E_SIZE_NORMAL;
606}
607
Alberto Garcia12c6aeb2020-07-10 18:12:48 +0200608static inline uint64_t get_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
609 int idx)
610{
Alberto Garcia39a9f0a2020-07-10 18:12:55 +0200611 idx *= l2_entry_size(s) / sizeof(uint64_t);
Alberto Garcia12c6aeb2020-07-10 18:12:48 +0200612 return be64_to_cpu(l2_slice[idx]);
613}
614
Alberto Garcia39a9f0a2020-07-10 18:12:55 +0200615static inline uint64_t get_l2_bitmap(BDRVQcow2State *s, uint64_t *l2_slice,
616 int idx)
617{
618 if (has_subclusters(s)) {
619 idx *= l2_entry_size(s) / sizeof(uint64_t);
620 return be64_to_cpu(l2_slice[idx + 1]);
621 } else {
622 return 0; /* For convenience only; this value has no meaning. */
623 }
624}
625
Alberto Garcia12c6aeb2020-07-10 18:12:48 +0200626static inline void set_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
627 int idx, uint64_t entry)
628{
Alberto Garcia39a9f0a2020-07-10 18:12:55 +0200629 idx *= l2_entry_size(s) / sizeof(uint64_t);
Alberto Garcia12c6aeb2020-07-10 18:12:48 +0200630 l2_slice[idx] = cpu_to_be64(entry);
631}
632
Alberto Garcia39a9f0a2020-07-10 18:12:55 +0200633static inline void set_l2_bitmap(BDRVQcow2State *s, uint64_t *l2_slice,
634 int idx, uint64_t bitmap)
635{
636 assert(has_subclusters(s));
637 idx *= l2_entry_size(s) / sizeof(uint64_t);
638 l2_slice[idx + 1] = cpu_to_be64(bitmap);
639}
640
Kevin Wolf93c24932019-01-14 16:48:25 +0100641static inline bool has_data_file(BlockDriverState *bs)
642{
643 BDRVQcow2State *s = bs->opaque;
644 return (s->data_file != bs->file);
645}
646
Kevin Wolf6c3944d2019-02-22 14:29:38 +0100647static inline bool data_file_is_raw(BlockDriverState *bs)
648{
649 BDRVQcow2State *s = bs->opaque;
650 return !!(s->autoclear_features & QCOW2_AUTOCLEAR_DATA_FILE_RAW);
651}
652
Kevin Wolfff991292015-09-07 17:12:56 +0200653static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
Kevin Wolf3b8e2e22013-03-26 17:50:02 +0100654{
655 return offset & ~(s->cluster_size - 1);
656}
657
Kevin Wolfff991292015-09-07 17:12:56 +0200658static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
Kevin Wolfc37f4cd2013-03-26 17:50:03 +0100659{
660 return offset & (s->cluster_size - 1);
661}
662
Alberto Garcia3e719812020-07-10 18:12:53 +0200663static inline int64_t offset_into_subcluster(BDRVQcow2State *s, int64_t offset)
664{
665 return offset & (s->subcluster_size - 1);
666}
667
Max Reitzb6d36de2015-09-14 16:39:47 +0200668static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200669{
670 return (size + (s->cluster_size - 1)) >> s->cluster_bits;
671}
672
Alberto Garcia3e719812020-07-10 18:12:53 +0200673static inline uint64_t size_to_subclusters(BDRVQcow2State *s, uint64_t size)
674{
675 return (size + (s->subcluster_size - 1)) >> s->subcluster_bits;
676}
677
Kevin Wolfff991292015-09-07 17:12:56 +0200678static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
Stefan Hajnoczi419b19d2010-04-28 11:36:11 +0100679{
680 int shift = s->cluster_bits + s->l2_bits;
681 return (size + (1ULL << shift) - 1) >> shift;
682}
683
Alberto Garcia05b5b6e2018-02-05 16:33:12 +0200684static inline int offset_to_l1_index(BDRVQcow2State *s, uint64_t offset)
685{
686 return offset >> (s->l2_bits + s->cluster_bits);
687}
688
Kevin Wolfff991292015-09-07 17:12:56 +0200689static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
Kevin Wolf17a71e52013-03-26 17:49:56 +0100690{
691 return (offset >> s->cluster_bits) & (s->l2_size - 1);
692}
693
Alberto Garcia8f818172018-02-05 16:33:14 +0200694static inline int offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset)
695{
696 return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
697}
698
Alberto Garciaa53e8b72020-07-10 18:12:52 +0200699static inline int offset_to_sc_index(BDRVQcow2State *s, int64_t offset)
700{
701 return (offset >> s->subcluster_bits) & (s->subclusters_per_cluster - 1);
702}
703
Kevin Wolfff991292015-09-07 17:12:56 +0200704static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
Kevin Wolf1ebf5612013-09-06 12:20:08 +0200705{
706 return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
707}
708
Kevin Wolf808c2bb2019-01-17 18:42:40 +0100709static inline QCow2ClusterType qcow2_get_cluster_type(BlockDriverState *bs,
710 uint64_t l2_entry)
Kevin Wolf68d000a2012-03-14 19:15:03 +0100711{
Alberto Garcia34905d82020-07-10 18:12:56 +0200712 BDRVQcow2State *s = bs->opaque;
713
Kevin Wolf68d000a2012-03-14 19:15:03 +0100714 if (l2_entry & QCOW_OFLAG_COMPRESSED) {
715 return QCOW2_CLUSTER_COMPRESSED;
Alberto Garcia34905d82020-07-10 18:12:56 +0200716 } else if ((l2_entry & QCOW_OFLAG_ZERO) && !has_subclusters(s)) {
Eric Blakefdfab372017-05-06 19:05:46 -0500717 if (l2_entry & L2E_OFFSET_MASK) {
718 return QCOW2_CLUSTER_ZERO_ALLOC;
719 }
720 return QCOW2_CLUSTER_ZERO_PLAIN;
Kevin Wolf68d000a2012-03-14 19:15:03 +0100721 } else if (!(l2_entry & L2E_OFFSET_MASK)) {
Kevin Wolfa4ea1842019-01-29 13:47:24 +0100722 /* Offset 0 generally means unallocated, but it is ambiguous with
723 * external data files because 0 is a valid offset there. However, all
724 * clusters in external data files always have refcount 1, so we can
725 * rely on QCOW_OFLAG_COPIED to disambiguate. */
726 if (has_data_file(bs) && (l2_entry & QCOW_OFLAG_COPIED)) {
727 return QCOW2_CLUSTER_NORMAL;
728 } else {
729 return QCOW2_CLUSTER_UNALLOCATED;
730 }
Kevin Wolf68d000a2012-03-14 19:15:03 +0100731 } else {
732 return QCOW2_CLUSTER_NORMAL;
733 }
734}
735
Alberto Garcia34905d82020-07-10 18:12:56 +0200736/*
Alberto Garcia34905d82020-07-10 18:12:56 +0200737 * In an image without subsclusters @l2_bitmap is ignored and
738 * @sc_index must be 0.
739 * Return QCOW2_SUBCLUSTER_INVALID if an invalid l2 entry is detected
740 * (this checks the whole entry and bitmap, not only the bits related
741 * to subcluster @sc_index).
742 */
743static inline
744QCow2SubclusterType qcow2_get_subcluster_type(BlockDriverState *bs,
745 uint64_t l2_entry,
746 uint64_t l2_bitmap,
747 unsigned sc_index)
748{
749 BDRVQcow2State *s = bs->opaque;
750 QCow2ClusterType type = qcow2_get_cluster_type(bs, l2_entry);
751 assert(sc_index < s->subclusters_per_cluster);
752
753 if (has_subclusters(s)) {
754 switch (type) {
755 case QCOW2_CLUSTER_COMPRESSED:
756 return QCOW2_SUBCLUSTER_COMPRESSED;
757 case QCOW2_CLUSTER_NORMAL:
758 if ((l2_bitmap >> 32) & l2_bitmap) {
759 return QCOW2_SUBCLUSTER_INVALID;
760 } else if (l2_bitmap & QCOW_OFLAG_SUB_ZERO(sc_index)) {
761 return QCOW2_SUBCLUSTER_ZERO_ALLOC;
762 } else if (l2_bitmap & QCOW_OFLAG_SUB_ALLOC(sc_index)) {
763 return QCOW2_SUBCLUSTER_NORMAL;
764 } else {
765 return QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC;
766 }
767 case QCOW2_CLUSTER_UNALLOCATED:
768 if (l2_bitmap & QCOW_L2_BITMAP_ALL_ALLOC) {
769 return QCOW2_SUBCLUSTER_INVALID;
770 } else if (l2_bitmap & QCOW_OFLAG_SUB_ZERO(sc_index)) {
771 return QCOW2_SUBCLUSTER_ZERO_PLAIN;
772 } else {
773 return QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN;
774 }
775 default:
776 g_assert_not_reached();
777 }
778 } else {
Alberto Garcia3f9c6b32020-07-10 18:13:03 +0200779 switch (type) {
780 case QCOW2_CLUSTER_COMPRESSED:
781 return QCOW2_SUBCLUSTER_COMPRESSED;
782 case QCOW2_CLUSTER_ZERO_PLAIN:
783 return QCOW2_SUBCLUSTER_ZERO_PLAIN;
784 case QCOW2_CLUSTER_ZERO_ALLOC:
785 return QCOW2_SUBCLUSTER_ZERO_ALLOC;
786 case QCOW2_CLUSTER_NORMAL:
787 return QCOW2_SUBCLUSTER_NORMAL;
788 case QCOW2_CLUSTER_UNALLOCATED:
789 return QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN;
790 default:
791 g_assert_not_reached();
792 }
Alberto Garcia34905d82020-07-10 18:12:56 +0200793 }
794}
795
Alberto Garciac94d0372020-07-10 18:12:58 +0200796static inline bool qcow2_cluster_is_allocated(QCow2ClusterType type)
797{
798 return (type == QCOW2_CLUSTER_COMPRESSED || type == QCOW2_CLUSTER_NORMAL ||
799 type == QCOW2_CLUSTER_ZERO_ALLOC);
800}
801
Stefan Hajnoczibfe80432012-07-27 09:05:22 +0100802/* Check whether refcounts are eager or lazy */
Kevin Wolfff991292015-09-07 17:12:56 +0200803static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
Stefan Hajnoczibfe80432012-07-27 09:05:22 +0100804{
805 return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
806}
Kevin Wolfc1424422009-05-28 16:07:06 +0200807
Kevin Wolf65eb2e32013-03-26 17:49:58 +0100808static inline uint64_t l2meta_cow_start(QCowL2Meta *m)
809{
810 return m->offset + m->cow_start.offset;
811}
812
813static inline uint64_t l2meta_cow_end(QCowL2Meta *m)
814{
Kevin Wolf85567392016-06-01 14:08:56 +0200815 return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
Kevin Wolf65eb2e32013-03-26 17:49:58 +0100816}
817
Max Reitz0e065282015-02-10 15:28:48 -0500818static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
Max Reitz2aabe7c2015-02-10 15:28:47 -0500819{
820 return r1 > r2 ? r1 - r2 : r2 - r1;
821}
822
Pavel Butsykin46b732c2017-09-18 15:42:29 +0300823static inline
824uint32_t offset_to_reftable_index(BDRVQcow2State *s, uint64_t offset)
825{
826 return offset >> (s->refcount_block_bits + s->cluster_bits);
827}
828
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200829/* qcow2.c functions */
Max Reitz12cc30a2017-06-13 22:21:03 +0200830int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size,
831 int refcount_order, bool generous_increase,
832 uint64_t *refblock_count);
833
Kevin Wolf280d3732012-12-07 18:08:47 +0100834int qcow2_mark_dirty(BlockDriverState *bs);
Max Reitz69c98722013-08-30 14:34:24 +0200835int qcow2_mark_corrupt(BlockDriverState *bs);
836int qcow2_mark_consistent(BlockDriverState *bs);
Kevin Wolfe24e49e2012-02-02 12:32:31 +0100837int qcow2_update_header(BlockDriverState *bs);
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200838
Max Reitz85186eb2014-09-05 16:07:16 +0200839void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
840 int64_t size, const char *message_format, ...)
841 GCC_FMT_ATTR(5, 6);
842
Alberto Garcia0cf0e592018-03-06 18:14:06 +0200843int qcow2_validate_table(BlockDriverState *bs, uint64_t offset,
844 uint64_t entries, size_t entry_len,
845 int64_t max_size_bytes, const char *table_name,
846 Error **errp);
847
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200848/* qcow2-refcount.c functions */
Kevin Wolfed6ccf02009-05-28 16:07:07 +0200849int qcow2_refcount_init(BlockDriverState *bs);
850void qcow2_refcount_close(BlockDriverState *bs);
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200851
Max Reitz7324c102015-02-10 15:28:46 -0500852int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
Max Reitz0e065282015-02-10 15:28:48 -0500853 uint64_t *refcount);
Max Reitz44751912014-10-27 11:12:54 +0100854
Max Reitz32b64442013-09-03 10:09:52 +0200855int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
Max Reitz0e065282015-02-10 15:28:48 -0500856 uint64_t addend, bool decrease,
Max Reitz2aabe7c2015-02-10 15:28:47 -0500857 enum qcow2_discard_type type);
Max Reitz32b64442013-09-03 10:09:52 +0200858
Max Reitz772d1f92017-06-13 22:21:05 +0200859int64_t qcow2_refcount_area(BlockDriverState *bs, uint64_t offset,
860 uint64_t additional_clusters, bool exact_size,
861 int new_refblock_index,
862 uint64_t new_refblock_offset);
863
Kevin Wolfbb572ae2014-03-26 13:05:51 +0100864int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
Max Reitzb6d36de2015-09-14 16:39:47 +0200865int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
866 int64_t nb_clusters);
Kevin Wolfed6ccf02009-05-28 16:07:07 +0200867int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
868void qcow2_free_clusters(BlockDriverState *bs,
Kevin Wolf6cfcb9b2013-06-19 13:44:18 +0200869 int64_t offset, int64_t size,
870 enum qcow2_discard_type type);
Alberto Garcia3fec2372020-09-08 16:08:28 +0200871void qcow2_free_any_cluster(BlockDriverState *bs, uint64_t l2_entry,
872 enum qcow2_discard_type type);
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200873
Kevin Wolfed6ccf02009-05-28 16:07:07 +0200874int qcow2_update_snapshot_refcount(BlockDriverState *bs,
875 int64_t l1_table_offset, int l1_size, int addend);
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200876
Paolo Bonzini8b220eb2018-03-01 17:36:14 +0100877int coroutine_fn qcow2_flush_caches(BlockDriverState *bs);
878int coroutine_fn qcow2_write_caches(BlockDriverState *bs);
Kevin Wolf166acf52012-05-11 18:18:36 +0200879int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
880 BdrvCheckMode fix);
Kevin Wolff7d0fe02009-05-28 16:07:04 +0200881
Kevin Wolf0b919fa2013-06-19 13:44:20 +0200882void qcow2_process_discards(BlockDriverState *bs, int ret);
883
Max Reitz231bb262013-10-10 11:09:23 +0200884int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
Max Reitza40f1c22013-08-30 14:34:25 +0200885 int64_t size);
Max Reitz231bb262013-10-10 11:09:23 +0200886int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
Kevin Wolf966b0002019-01-15 20:39:06 +0100887 int64_t size, bool data_file);
Vladimir Sementsov-Ogievskiy8a5bb1f2017-06-28 15:05:07 +0300888int qcow2_inc_refcounts_imrt(BlockDriverState *bs, BdrvCheckResult *res,
889 void **refcount_table,
890 int64_t *refcount_table_size,
891 int64_t offset, int64_t size);
Max Reitza40f1c22013-08-30 14:34:25 +0200892
Max Reitz791c9a02015-07-27 17:51:37 +0200893int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
894 BlockDriverAmendStatusCB *status_cb,
895 void *cb_opaque, Error **errp);
Pavel Butsykin46b732c2017-09-18 15:42:29 +0300896int qcow2_shrink_reftable(BlockDriverState *bs);
Pavel Butsykin163bc392017-09-29 15:16:13 +0300897int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size);
Vladimir Sementsov-Ogievskiy69f47502019-04-08 19:26:17 +0300898int qcow2_detect_metadata_preallocation(BlockDriverState *bs);
Max Reitz791c9a02015-07-27 17:51:37 +0200899
Kevin Wolf45aba422009-05-28 16:07:05 +0200900/* qcow2-cluster.c functions */
Kevin Wolf2cf7cfa2013-05-14 16:14:33 +0200901int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
902 bool exact_size);
Pavel Butsykin46b732c2017-09-18 15:42:29 +0300903int qcow2_shrink_l1_table(BlockDriverState *bs, uint64_t max_size);
Max Reitze23e4002013-08-30 14:34:28 +0200904int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
Kevin Wolfff991292015-09-07 17:12:56 +0200905int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
Daniel P. Berrange446d3062017-06-23 17:24:09 +0100906 uint8_t *buf, int nb_sectors, bool enc, Error **errp);
Kevin Wolf45aba422009-05-28 16:07:05 +0200907
Alberto Garcia388e5812020-07-10 18:12:44 +0200908int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset,
Alberto Garciaca4a0bb2020-07-10 18:12:59 +0200909 unsigned int *bytes, uint64_t *host_offset,
Alberto Garcia10dabdc52020-07-10 18:13:00 +0200910 QCow2SubclusterType *subcluster_type);
Alberto Garciabfd09892020-09-11 16:09:42 +0200911int qcow2_alloc_host_offset(BlockDriverState *bs, uint64_t offset,
912 unsigned int *bytes, uint64_t *host_offset,
913 QCowL2Meta **m);
Kevin Wolf77e023f2019-02-27 10:26:24 +0100914int qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
915 uint64_t offset,
916 int compressed_size,
917 uint64_t *host_offset);
Vladimir Sementsov-Ogievskiya6e09842021-09-14 15:24:47 +0300918void qcow2_parse_compressed_l2_entry(BlockDriverState *bs, uint64_t l2_entry,
919 uint64_t *coffset, int *csize);
Kevin Wolf45aba422009-05-28 16:07:05 +0200920
Kevin Wolf148da7e2010-01-20 15:03:01 +0100921int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
Kevin Wolf8b24cd12018-06-28 17:05:45 +0200922void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m);
Eric Blaked2cb36a2017-05-06 19:05:52 -0500923int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset,
924 uint64_t bytes, enum qcow2_discard_type type,
925 bool full_discard);
Alberto Garciaa6841a22020-07-10 18:13:10 +0200926int qcow2_subcluster_zeroize(BlockDriverState *bs, uint64_t offset,
927 uint64_t bytes, int flags);
Kevin Wolf45aba422009-05-28 16:07:05 +0200928
Max Reitz4057a2b2014-10-27 11:12:53 +0100929int qcow2_expand_zero_clusters(BlockDriverState *bs,
Max Reitz8b139762015-07-27 17:51:32 +0200930 BlockDriverAmendStatusCB *status_cb,
931 void *cb_opaque);
Max Reitz32b64442013-09-03 10:09:52 +0200932
Kevin Wolfc1424422009-05-28 16:07:06 +0200933/* qcow2-snapshot.c functions */
Kevin Wolfed6ccf02009-05-28 16:07:07 +0200934int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
935int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
Wenchao Xiaa89d89d2013-09-11 14:04:33 +0800936int qcow2_snapshot_delete(BlockDriverState *bs,
937 const char *snapshot_id,
938 const char *name,
939 Error **errp);
Kevin Wolfed6ccf02009-05-28 16:07:07 +0200940int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
Wenchao Xia7b4c4782013-12-04 17:10:54 +0800941int qcow2_snapshot_load_tmp(BlockDriverState *bs,
942 const char *snapshot_id,
943 const char *name,
944 Error **errp);
Kevin Wolfc1424422009-05-28 16:07:06 +0200945
Kevin Wolfed6ccf02009-05-28 16:07:07 +0200946void qcow2_free_snapshots(BlockDriverState *bs);
Max Reitzecf6c7c2019-10-11 17:28:01 +0200947int qcow2_read_snapshots(BlockDriverState *bs, Error **errp);
Max Reitze0314b52019-10-11 17:28:03 +0200948int qcow2_write_snapshots(BlockDriverState *bs);
Kevin Wolfc1424422009-05-28 16:07:06 +0200949
Max Reitz8bc584f2019-10-11 17:28:06 +0200950int coroutine_fn qcow2_check_read_snapshot_table(BlockDriverState *bs,
951 BdrvCheckResult *result,
952 BdrvCheckMode fix);
Max Reitzfe446b52019-10-11 17:28:07 +0200953int coroutine_fn qcow2_check_fix_snapshot_table(BlockDriverState *bs,
954 BdrvCheckResult *result,
955 BdrvCheckMode fix);
Max Reitz8bc584f2019-10-11 17:28:06 +0200956
Kevin Wolf49381092011-01-10 17:15:10 +0100957/* qcow2-cache.c functions */
Alberto Garcia1221fe62018-02-05 16:33:36 +0200958Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables,
959 unsigned table_size);
Alberto Garciae64d4072018-02-05 16:33:08 +0200960int qcow2_cache_destroy(Qcow2Cache *c);
Kevin Wolf49381092011-01-10 17:15:10 +0100961
Alberto Garcia2d135ee2018-02-05 16:33:06 +0200962void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
Kevin Wolf49381092011-01-10 17:15:10 +0100963int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
Denis V. Lunevf3c3b872016-06-02 18:58:15 +0300964int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
Kevin Wolf49381092011-01-10 17:15:10 +0100965int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
966 Qcow2Cache *dependency);
Kevin Wolf3de0a292011-01-14 15:55:38 +0100967void qcow2_cache_depends_on_flush(Qcow2Cache *c);
Kevin Wolf49381092011-01-10 17:15:10 +0100968
Alberto Garciab2f68bf2018-02-05 16:33:09 +0200969void qcow2_cache_clean_unused(Qcow2Cache *c);
Max Reitze7108fe2013-09-03 10:09:51 +0200970int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
971
Kevin Wolf49381092011-01-10 17:15:10 +0100972int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
973 void **table);
974int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
975 void **table);
Alberto Garcia2013c3d2018-02-05 16:33:07 +0200976void qcow2_cache_put(Qcow2Cache *c, void **table);
Alberto Garcia6e6fa762018-02-05 16:33:11 +0200977void *qcow2_cache_is_table_offset(Qcow2Cache *c, uint64_t offset);
Alberto Garcia77aadd72018-02-05 16:33:10 +0200978void qcow2_cache_discard(Qcow2Cache *c, void *table);
Kevin Wolf49381092011-01-10 17:15:10 +0100979
Vladimir Sementsov-Ogievskiy88ddffa2017-06-28 15:05:08 +0300980/* qcow2-bitmap.c functions */
981int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
982 void **refcount_table,
983 int64_t *refcount_table_size);
Vladimir Sementsov-Ogievskiy0c1e9d22021-02-02 15:49:51 +0300984bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, bool *header_updated,
985 Error **errp);
Vladimir Sementsov-Ogievskiy83bad8c2021-02-02 15:49:50 +0300986bool qcow2_get_bitmap_info_list(BlockDriverState *bs,
987 Qcow2BitmapInfoList **info_list, Error **errp);
Vladimir Sementsov-Ogievskiy1b6b0562017-06-28 15:05:14 +0300988int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
John Snowd19c6b32019-03-11 21:51:46 +0300989int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp);
Vladimir Sementsov-Ogievskiy526e31d2021-02-02 15:49:52 +0300990bool qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs,
Vladimir Sementsov-Ogievskiy644ddbb2019-09-27 15:23:52 +0300991 bool release_stored, Error **errp);
Vladimir Sementsov-Ogievskiy169b8792017-06-28 15:05:20 +0300992int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp);
Vladimir Sementsov-Ogievskiyd2c30802019-09-20 11:25:43 +0300993bool qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs,
994 const char *name,
995 uint32_t granularity,
Vladimir Sementsov-Ogievskiyb56a1e32019-09-20 11:25:42 +0300996 Error **errp);
Vladimir Sementsov-Ogievskiyd2c30802019-09-20 11:25:43 +0300997int qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs,
998 const char *name,
999 Error **errp);
Eric Blakeef893b52020-05-12 20:16:42 -05001000bool qcow2_supports_persistent_dirty_bitmap(BlockDriverState *bs);
Eric Blake5d72c682020-05-21 14:21:34 -05001001uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *bs,
1002 uint32_t cluster_size);
Vladimir Sementsov-Ogievskiyd1258dd2017-06-28 15:05:11 +03001003
Vladimir Sementsov-Ogievskiy56e2f1d2019-05-06 17:27:35 +03001004ssize_t coroutine_fn
1005qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
1006 const void *src, size_t src_size);
1007ssize_t coroutine_fn
1008qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
1009 const void *src, size_t src_size);
Vladimir Sementsov-Ogievskiy8ac0f152019-05-06 17:27:41 +03001010int coroutine_fn
Maxim Levitsky603fbd02019-09-15 23:36:54 +03001011qcow2_co_encrypt(BlockDriverState *bs, uint64_t host_offset,
1012 uint64_t guest_offset, void *buf, size_t len);
Vladimir Sementsov-Ogievskiy8ac0f152019-05-06 17:27:41 +03001013int coroutine_fn
Maxim Levitsky603fbd02019-09-15 23:36:54 +03001014qcow2_co_decrypt(BlockDriverState *bs, uint64_t host_offset,
1015 uint64_t guest_offset, void *buf, size_t len);
Vladimir Sementsov-Ogievskiy56e2f1d2019-05-06 17:27:35 +03001016
Kevin Wolff7d0fe02009-05-28 16:07:04 +02001017#endif