qemu/block/qcow2.h
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   1/*
   2 * Block driver for the QCOW version 2 format
   3 *
   4 * Copyright (c) 2004-2006 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#ifndef BLOCK_QCOW2_H
  26#define BLOCK_QCOW2_H
  27
  28#include "crypto/block.h"
  29#include "qemu/coroutine.h"
  30#include "qemu/units.h"
  31#include "block/block_int.h"
  32
  33//#define DEBUG_ALLOC
  34//#define DEBUG_ALLOC2
  35//#define DEBUG_EXT
  36
  37#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
  38
  39#define QCOW_CRYPT_NONE 0
  40#define QCOW_CRYPT_AES  1
  41#define QCOW_CRYPT_LUKS 2
  42
  43#define QCOW_MAX_CRYPT_CLUSTERS 32
  44#define QCOW_MAX_SNAPSHOTS 65536
  45
  46/* 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
  52/* 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) */
  54#define QCOW_MAX_REFTABLE_SIZE (8 * MiB)
  55
  56/* 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) */
  58#define QCOW_MAX_L1_SIZE (32 * MiB)
  59
  60/* 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
  64/* Maximum amount of extra data per snapshot table entry to accept */
  65#define QCOW_MAX_SNAPSHOT_EXTRA_DATA 1024
  66
  67/* Bitmap header extension constraints */
  68#define QCOW2_MAX_BITMAPS 65535
  69#define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS)
  70
  71/* Maximum of parallel sub-request per guest request */
  72#define QCOW2_MAX_WORKERS 8
  73
  74/* indicate that the refcount of the referenced cluster is exactly one. */
  75#define QCOW_OFLAG_COPIED     (1ULL << 63)
  76/* indicate that the cluster is compressed (they never have the copied flag) */
  77#define QCOW_OFLAG_COMPRESSED (1ULL << 62)
  78/* The cluster reads as all zeros */
  79#define QCOW_OFLAG_ZERO (1ULL << 0)
  80
  81#define QCOW_EXTL2_SUBCLUSTERS_PER_CLUSTER 32
  82
  83/* 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
  98/* 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
 102/* 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
 108#define MIN_CLUSTER_BITS 9
 109#define MAX_CLUSTER_BITS 21
 110
 111/* Defined in the qcow2 spec (compressed cluster descriptor) */
 112#define QCOW2_COMPRESSED_SECTOR_SIZE 512U
 113
 114/* Must be at least 2 to cover COW */
 115#define MIN_L2_CACHE_SIZE 2 /* cache entries */
 116
 117/* Must be at least 4 to cover all cases of refcount table growth */
 118#define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */
 119
 120#ifdef CONFIG_LINUX
 121#define DEFAULT_L2_CACHE_MAX_SIZE (32 * MiB)
 122#define DEFAULT_CACHE_CLEAN_INTERVAL 600  /* seconds */
 123#else
 124#define DEFAULT_L2_CACHE_MAX_SIZE (8 * MiB)
 125/* Cache clean interval is currently available only on Linux, so must be 0 */
 126#define DEFAULT_CACHE_CLEAN_INTERVAL 0
 127#endif
 128
 129#define DEFAULT_CLUSTER_SIZE 65536
 130
 131#define QCOW2_OPT_DATA_FILE "data-file"
 132#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"
 136#define QCOW2_OPT_OVERLAP "overlap-check"
 137#define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
 138#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"
 146#define QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY "overlap-check.bitmap-directory"
 147#define QCOW2_OPT_CACHE_SIZE "cache-size"
 148#define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
 149#define QCOW2_OPT_L2_CACHE_ENTRY_SIZE "l2-cache-entry-size"
 150#define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
 151#define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval"
 152
 153typedef 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;
 167
 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;
 175
 176    /* Additional fields */
 177    uint8_t compression_type;
 178
 179    /* header must be a multiple of 8 */
 180    uint8_t padding[7];
 181} QEMU_PACKED QCowHeader;
 182
 183QEMU_BUILD_BUG_ON(!QEMU_IS_ALIGNED(sizeof(QCowHeader), 8));
 184
 185typedef 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;
 208    uint64_t icount;
 209} QCowSnapshotExtraData;
 210
 211
 212typedef struct QCowSnapshot {
 213    uint64_t l1_table_offset;
 214    uint32_t l1_size;
 215    char *id_str;
 216    char *name;
 217    uint64_t disk_size;
 218    uint64_t vm_state_size;
 219    uint32_t date_sec;
 220    uint32_t date_nsec;
 221    uint64_t vm_clock_nsec;
 222    /* icount value for the moment when snapshot was taken */
 223    uint64_t icount;
 224    /* 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;
 228} QCowSnapshot;
 229
 230struct Qcow2Cache;
 231typedef struct Qcow2Cache Qcow2Cache;
 232
 233typedef struct Qcow2CryptoHeaderExtension {
 234    uint64_t offset;
 235    uint64_t length;
 236} QEMU_PACKED Qcow2CryptoHeaderExtension;
 237
 238typedef struct Qcow2UnknownHeaderExtension {
 239    uint32_t magic;
 240    uint32_t len;
 241    QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
 242    uint8_t data[];
 243} Qcow2UnknownHeaderExtension;
 244
 245enum {
 246    QCOW2_FEAT_TYPE_INCOMPATIBLE    = 0,
 247    QCOW2_FEAT_TYPE_COMPATIBLE      = 1,
 248    QCOW2_FEAT_TYPE_AUTOCLEAR       = 2,
 249};
 250
 251/* Incompatible feature bits */
 252enum {
 253    QCOW2_INCOMPAT_DIRTY_BITNR      = 0,
 254    QCOW2_INCOMPAT_CORRUPT_BITNR    = 1,
 255    QCOW2_INCOMPAT_DATA_FILE_BITNR  = 2,
 256    QCOW2_INCOMPAT_COMPRESSION_BITNR = 3,
 257    QCOW2_INCOMPAT_EXTL2_BITNR      = 4,
 258    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,
 261    QCOW2_INCOMPAT_COMPRESSION      = 1 << QCOW2_INCOMPAT_COMPRESSION_BITNR,
 262    QCOW2_INCOMPAT_EXTL2            = 1 << QCOW2_INCOMPAT_EXTL2_BITNR,
 263
 264    QCOW2_INCOMPAT_MASK             = QCOW2_INCOMPAT_DIRTY
 265                                    | QCOW2_INCOMPAT_CORRUPT
 266                                    | QCOW2_INCOMPAT_DATA_FILE
 267                                    | QCOW2_INCOMPAT_COMPRESSION
 268                                    | QCOW2_INCOMPAT_EXTL2,
 269};
 270
 271/* 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
 279/* Autoclear feature bits */
 280enum {
 281    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,
 285
 286    QCOW2_AUTOCLEAR_MASK                = QCOW2_AUTOCLEAR_BITMAPS
 287                                        | QCOW2_AUTOCLEAR_DATA_FILE_RAW,
 288};
 289
 290enum 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
 299typedef struct Qcow2Feature {
 300    uint8_t type;
 301    uint8_t bit;
 302    char    name[46];
 303} QEMU_PACKED Qcow2Feature;
 304
 305typedef struct Qcow2DiscardRegion {
 306    BlockDriverState *bs;
 307    uint64_t offset;
 308    uint64_t bytes;
 309    QTAILQ_ENTRY(Qcow2DiscardRegion) next;
 310} Qcow2DiscardRegion;
 311
 312typedef 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
 317typedef 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
 324#define QCOW2_MAX_THREADS 4
 325
 326typedef struct BDRVQcow2State {
 327    int cluster_bits;
 328    int cluster_size;
 329    int l2_slice_size;
 330    int subcluster_bits;
 331    int subcluster_size;
 332    int subclusters_per_cluster;
 333    int l2_bits;
 334    int l2_size;
 335    int l1_size;
 336    int l1_vm_state_index;
 337    int refcount_block_bits;
 338    int refcount_block_size;
 339    int csize_shift;
 340    int csize_mask;
 341    uint64_t cluster_offset_mask;
 342    uint64_t l1_table_offset;
 343    uint64_t *l1_table;
 344
 345    Qcow2Cache *l2_table_cache;
 346    Qcow2Cache *refcount_block_cache;
 347    QEMUTimer *cache_clean_timer;
 348    unsigned cache_clean_interval;
 349
 350    QLIST_HEAD(, QCowL2Meta) cluster_allocs;
 351
 352    uint64_t *refcount_table;
 353    uint64_t refcount_table_offset;
 354    uint32_t refcount_table_size;
 355    uint32_t max_refcount_table_index; /* Last used entry in refcount_table */
 356    uint64_t free_cluster_index;
 357    uint64_t free_byte_offset;
 358
 359    CoMutex lock;
 360
 361    Qcow2CryptoHeaderExtension crypto_header; /* QCow2 header extension */
 362    QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */
 363    QCryptoBlock *crypto; /* Disk encryption format driver */
 364    bool crypt_physical_offset; /* Whether to use virtual or physical offset
 365                                   for encryption initialization vector tweak */
 366    uint32_t crypt_method_header;
 367    uint64_t snapshots_offset;
 368    int snapshots_size;
 369    unsigned int nb_snapshots;
 370    QCowSnapshot *snapshots;
 371
 372    uint32_t nb_bitmaps;
 373    uint64_t bitmap_directory_size;
 374    uint64_t bitmap_directory_offset;
 375
 376    int flags;
 377    int qcow_version;
 378    bool use_lazy_refcounts;
 379    int refcount_order;
 380    int refcount_bits;
 381    uint64_t refcount_max;
 382
 383    Qcow2GetRefcountFunc *get_refcount;
 384    Qcow2SetRefcountFunc *set_refcount;
 385
 386    bool discard_passthrough[QCOW2_DISCARD_MAX];
 387
 388    int overlap_check; /* bitmask of Qcow2MetadataOverlap values */
 389    bool signaled_corruption;
 390
 391    uint64_t incompatible_features;
 392    uint64_t compatible_features;
 393    uint64_t autoclear_features;
 394
 395    size_t unknown_header_fields_size;
 396    void *unknown_header_fields;
 397    QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
 398    QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
 399    bool cache_discards;
 400
 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;
 406    char *image_data_file;
 407
 408    CoQueue thread_task_queue;
 409    int nb_threads;
 410
 411    BdrvChild *data_file;
 412
 413    bool metadata_preallocation_checked;
 414    bool metadata_preallocation;
 415    /*
 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;
 422} BDRVQcow2State;
 423
 424typedef struct Qcow2COWRegion {
 425    /**
 426     * Offset of the COW region in bytes from the start of the first cluster
 427     * touched by the request.
 428     */
 429    unsigned    offset;
 430
 431    /** Number of bytes to copy */
 432    unsigned    nb_bytes;
 433} Qcow2COWRegion;
 434
 435/**
 436 * Describes an in-flight (part of a) write request that writes to clusters
 437 * that need to have their L2 table entries updated (because they are
 438 * newly allocated or need changes in their L2 bitmaps)
 439 */
 440typedef struct QCowL2Meta
 441{
 442    /** Guest offset of the first updated cluster */
 443    uint64_t offset;
 444
 445    /** Host offset of the first updated cluster */
 446    uint64_t alloc_offset;
 447
 448    /** Number of updated clusters */
 449    int nb_clusters;
 450
 451    /** Do not free the old clusters */
 452    bool keep_old_clusters;
 453
 454    /**
 455     * Requests that overlap with this allocation and wait to be restarted
 456     * when the allocating request has completed.
 457     */
 458    CoQueue dependent_requests;
 459
 460    /**
 461     * 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.
 464     */
 465    Qcow2COWRegion cow_start;
 466
 467    /**
 468     * 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).
 471     */
 472    Qcow2COWRegion cow_end;
 473
 474    /*
 475     * Indicates that COW regions are already handled and do not require
 476     * any more processing.
 477     */
 478    bool skip_cow;
 479
 480    /**
 481     * 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    /**
 489     * 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;
 494    size_t data_qiov_offset;
 495
 496    /** Pointer to next L2Meta of the same write request */
 497    struct QCowL2Meta *next;
 498
 499    QLIST_ENTRY(QCowL2Meta) next_in_flight;
 500} QCowL2Meta;
 501
 502/*
 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
 529typedef enum QCow2ClusterType {
 530    QCOW2_CLUSTER_UNALLOCATED,
 531    QCOW2_CLUSTER_ZERO_PLAIN,
 532    QCOW2_CLUSTER_ZERO_ALLOC,
 533    QCOW2_CLUSTER_NORMAL,
 534    QCOW2_CLUSTER_COMPRESSED,
 535} QCow2ClusterType;
 536
 537typedef 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
 547typedef enum QCow2MetadataOverlap {
 548    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,
 557
 558    QCOW2_OL_MAX_BITNR              = 9,
 559
 560    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),
 568    /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv
 569     * reads. */
 570    QCOW2_OL_INACTIVE_L2      = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
 571    QCOW2_OL_BITMAP_DIRECTORY = (1 << QCOW2_OL_BITMAP_DIRECTORY_BITNR),
 572} QCow2MetadataOverlap;
 573
 574/* 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 | \
 577     QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_BITMAP_DIRECTORY)
 578
 579/* Perform all overlap checks which don't require disk access */
 580#define QCOW2_OL_CACHED \
 581    (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)
 587
 588#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
 589#define L1E_RESERVED_MASK 0x7f000000000001ffULL
 590#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
 591#define L2E_STD_RESERVED_MASK 0x3f000000000001feULL
 592
 593#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
 594#define REFT_RESERVED_MASK 0x1ffULL
 595
 596#define INV_OFFSET (-1ULL)
 597
 598static inline bool has_subclusters(BDRVQcow2State *s)
 599{
 600    return s->incompatible_features & QCOW2_INCOMPAT_EXTL2;
 601}
 602
 603static inline size_t l2_entry_size(BDRVQcow2State *s)
 604{
 605    return has_subclusters(s) ? L2E_SIZE_EXTENDED : L2E_SIZE_NORMAL;
 606}
 607
 608static inline uint64_t get_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
 609                                    int idx)
 610{
 611    idx *= l2_entry_size(s) / sizeof(uint64_t);
 612    return be64_to_cpu(l2_slice[idx]);
 613}
 614
 615static 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
 626static inline void set_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice,
 627                                int idx, uint64_t entry)
 628{
 629    idx *= l2_entry_size(s) / sizeof(uint64_t);
 630    l2_slice[idx] = cpu_to_be64(entry);
 631}
 632
 633static 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
 641static inline bool has_data_file(BlockDriverState *bs)
 642{
 643    BDRVQcow2State *s = bs->opaque;
 644    return (s->data_file != bs->file);
 645}
 646
 647static 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
 653static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset)
 654{
 655    return offset & ~(s->cluster_size - 1);
 656}
 657
 658static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset)
 659{
 660    return offset & (s->cluster_size - 1);
 661}
 662
 663static inline int64_t offset_into_subcluster(BDRVQcow2State *s, int64_t offset)
 664{
 665    return offset & (s->subcluster_size - 1);
 666}
 667
 668static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size)
 669{
 670    return (size + (s->cluster_size - 1)) >> s->cluster_bits;
 671}
 672
 673static inline uint64_t size_to_subclusters(BDRVQcow2State *s, uint64_t size)
 674{
 675    return (size + (s->subcluster_size - 1)) >> s->subcluster_bits;
 676}
 677
 678static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size)
 679{
 680    int shift = s->cluster_bits + s->l2_bits;
 681    return (size + (1ULL << shift) - 1) >> shift;
 682}
 683
 684static inline int offset_to_l1_index(BDRVQcow2State *s, uint64_t offset)
 685{
 686    return offset >> (s->l2_bits + s->cluster_bits);
 687}
 688
 689static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset)
 690{
 691    return (offset >> s->cluster_bits) & (s->l2_size - 1);
 692}
 693
 694static 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
 699static 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
 704static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
 705{
 706    return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
 707}
 708
 709static inline QCow2ClusterType qcow2_get_cluster_type(BlockDriverState *bs,
 710                                                      uint64_t l2_entry)
 711{
 712    BDRVQcow2State *s = bs->opaque;
 713
 714    if (l2_entry & QCOW_OFLAG_COMPRESSED) {
 715        return QCOW2_CLUSTER_COMPRESSED;
 716    } else if ((l2_entry & QCOW_OFLAG_ZERO) && !has_subclusters(s)) {
 717        if (l2_entry & L2E_OFFSET_MASK) {
 718            return QCOW2_CLUSTER_ZERO_ALLOC;
 719        }
 720        return QCOW2_CLUSTER_ZERO_PLAIN;
 721    } else if (!(l2_entry & L2E_OFFSET_MASK)) {
 722        /* 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        }
 731    } else {
 732        return QCOW2_CLUSTER_NORMAL;
 733    }
 734}
 735
 736/*
 737 * 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 {
 779        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        }
 793    }
 794}
 795
 796static 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
 802/* Check whether refcounts are eager or lazy */
 803static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s)
 804{
 805    return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
 806}
 807
 808static 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{
 815    return m->offset + m->cow_end.offset + m->cow_end.nb_bytes;
 816}
 817
 818static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2)
 819{
 820    return r1 > r2 ? r1 - r2 : r2 - r1;
 821}
 822
 823static 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
 829/* qcow2.c functions */
 830int64_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
 834int qcow2_mark_dirty(BlockDriverState *bs);
 835int qcow2_mark_corrupt(BlockDriverState *bs);
 836int qcow2_mark_consistent(BlockDriverState *bs);
 837int qcow2_update_header(BlockDriverState *bs);
 838
 839void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
 840                             int64_t size, const char *message_format, ...)
 841                             G_GNUC_PRINTF(5, 6);
 842
 843int 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
 848/* qcow2-refcount.c functions */
 849int coroutine_fn qcow2_refcount_init(BlockDriverState *bs);
 850void qcow2_refcount_close(BlockDriverState *bs);
 851
 852int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index,
 853                       uint64_t *refcount);
 854
 855int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
 856                                  uint64_t addend, bool decrease,
 857                                  enum qcow2_discard_type type);
 858
 859int64_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
 864int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
 865int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
 866                                int64_t nb_clusters);
 867int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
 868void qcow2_free_clusters(BlockDriverState *bs,
 869                          int64_t offset, int64_t size,
 870                          enum qcow2_discard_type type);
 871void qcow2_free_any_cluster(BlockDriverState *bs, uint64_t l2_entry,
 872                            enum qcow2_discard_type type);
 873
 874int qcow2_update_snapshot_refcount(BlockDriverState *bs,
 875    int64_t l1_table_offset, int l1_size, int addend);
 876
 877int qcow2_flush_caches(BlockDriverState *bs);
 878int qcow2_write_caches(BlockDriverState *bs);
 879int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
 880                          BdrvCheckMode fix);
 881
 882void qcow2_process_discards(BlockDriverState *bs, int ret);
 883
 884int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
 885                                 int64_t size);
 886int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
 887                                  int64_t size, bool data_file);
 888int 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);
 892
 893int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order,
 894                                BlockDriverAmendStatusCB *status_cb,
 895                                void *cb_opaque, Error **errp);
 896int coroutine_fn qcow2_shrink_reftable(BlockDriverState *bs);
 897int64_t qcow2_get_last_cluster(BlockDriverState *bs, int64_t size);
 898int coroutine_fn qcow2_detect_metadata_preallocation(BlockDriverState *bs);
 899
 900/* qcow2-cluster.c functions */
 901int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
 902                        bool exact_size);
 903int coroutine_fn qcow2_shrink_l1_table(BlockDriverState *bs, uint64_t max_size);
 904int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index);
 905int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num,
 906                          uint8_t *buf, int nb_sectors, bool enc, Error **errp);
 907
 908int qcow2_get_host_offset(BlockDriverState *bs, uint64_t offset,
 909                          unsigned int *bytes, uint64_t *host_offset,
 910                          QCow2SubclusterType *subcluster_type);
 911int coroutine_fn qcow2_alloc_host_offset(BlockDriverState *bs, uint64_t offset,
 912                                         unsigned int *bytes,
 913                                         uint64_t *host_offset, QCowL2Meta **m);
 914int coroutine_fn qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
 915                                                       uint64_t offset,
 916                                                       int compressed_size,
 917                                                       uint64_t *host_offset);
 918void qcow2_parse_compressed_l2_entry(BlockDriverState *bs, uint64_t l2_entry,
 919                                     uint64_t *coffset, int *csize);
 920
 921int coroutine_fn qcow2_alloc_cluster_link_l2(BlockDriverState *bs,
 922                                             QCowL2Meta *m);
 923void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m);
 924int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset,
 925                          uint64_t bytes, enum qcow2_discard_type type,
 926                          bool full_discard);
 927int coroutine_fn qcow2_subcluster_zeroize(BlockDriverState *bs, uint64_t offset,
 928                                          uint64_t bytes, int flags);
 929
 930int qcow2_expand_zero_clusters(BlockDriverState *bs,
 931                               BlockDriverAmendStatusCB *status_cb,
 932                               void *cb_opaque);
 933
 934/* qcow2-snapshot.c functions */
 935int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
 936int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
 937int qcow2_snapshot_delete(BlockDriverState *bs,
 938                          const char *snapshot_id,
 939                          const char *name,
 940                          Error **errp);
 941int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
 942int qcow2_snapshot_load_tmp(BlockDriverState *bs,
 943                            const char *snapshot_id,
 944                            const char *name,
 945                            Error **errp);
 946
 947void qcow2_free_snapshots(BlockDriverState *bs);
 948int qcow2_read_snapshots(BlockDriverState *bs, Error **errp);
 949int qcow2_write_snapshots(BlockDriverState *bs);
 950
 951int coroutine_fn qcow2_check_read_snapshot_table(BlockDriverState *bs,
 952                                                 BdrvCheckResult *result,
 953                                                 BdrvCheckMode fix);
 954int coroutine_fn qcow2_check_fix_snapshot_table(BlockDriverState *bs,
 955                                                BdrvCheckResult *result,
 956                                                BdrvCheckMode fix);
 957
 958/* qcow2-cache.c functions */
 959Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables,
 960                               unsigned table_size);
 961int qcow2_cache_destroy(Qcow2Cache *c);
 962
 963void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
 964int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
 965int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c);
 966int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
 967    Qcow2Cache *dependency);
 968void qcow2_cache_depends_on_flush(Qcow2Cache *c);
 969
 970void qcow2_cache_clean_unused(Qcow2Cache *c);
 971int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
 972
 973int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
 974    void **table);
 975int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
 976    void **table);
 977void qcow2_cache_put(Qcow2Cache *c, void **table);
 978void *qcow2_cache_is_table_offset(Qcow2Cache *c, uint64_t offset);
 979void qcow2_cache_discard(Qcow2Cache *c, void *table);
 980
 981/* qcow2-bitmap.c functions */
 982int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
 983                                  void **refcount_table,
 984                                  int64_t *refcount_table_size);
 985bool coroutine_fn qcow2_load_dirty_bitmaps(BlockDriverState *bs,
 986                                           bool *header_updated, Error **errp);
 987bool qcow2_get_bitmap_info_list(BlockDriverState *bs,
 988                                Qcow2BitmapInfoList **info_list, Error **errp);
 989int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
 990int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp);
 991bool qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs,
 992                                          bool release_stored, Error **errp);
 993int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp);
 994bool coroutine_fn qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs,
 995                                                      const char *name,
 996                                                      uint32_t granularity,
 997                                                      Error **errp);
 998int coroutine_fn qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs,
 999                                                         const char *name,
1000                                                         Error **errp);
1001bool qcow2_supports_persistent_dirty_bitmap(BlockDriverState *bs);
1002uint64_t qcow2_get_persistent_dirty_bitmap_size(BlockDriverState *bs,
1003                                                uint32_t cluster_size);
1004
1005ssize_t coroutine_fn
1006qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,
1007                  const void *src, size_t src_size);
1008ssize_t coroutine_fn
1009qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size,
1010                    const void *src, size_t src_size);
1011int coroutine_fn
1012qcow2_co_encrypt(BlockDriverState *bs, uint64_t host_offset,
1013                 uint64_t guest_offset, void *buf, size_t len);
1014int coroutine_fn
1015qcow2_co_decrypt(BlockDriverState *bs, uint64_t host_offset,
1016                 uint64_t guest_offset, void *buf, size_t len);
1017
1018#endif
1019