/* * Block driver for the QCOW version 2 format * * Copyright (c) 2004-2006 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef BLOCK_QCOW2_H #define BLOCK_QCOW2_H #include "crypto/block.h" #include "qemu/coroutine.h" //#define DEBUG_ALLOC //#define DEBUG_ALLOC2 //#define DEBUG_EXT #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) #define QCOW_CRYPT_NONE 0 #define QCOW_CRYPT_AES 1 #define QCOW_CRYPT_LUKS 2 #define QCOW_MAX_CRYPT_CLUSTERS 32 #define QCOW_MAX_SNAPSHOTS 65536 /* 8 MB refcount table is enough for 2 PB images at 64k cluster size * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ #define QCOW_MAX_REFTABLE_SIZE 0x800000 /* 32 MB L1 table is enough for 2 PB images at 64k cluster size * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ #define QCOW_MAX_L1_SIZE 0x2000000 /* Allow for an average of 1k per snapshot table entry, should be plenty of * space for snapshot names and IDs */ #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS) /* Bitmap header extension constraints */ #define QCOW2_MAX_BITMAPS 65535 #define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS) /* indicate that the refcount of the referenced cluster is exactly one. */ #define QCOW_OFLAG_COPIED (1ULL << 63) /* indicate that the cluster is compressed (they never have the copied flag) */ #define QCOW_OFLAG_COMPRESSED (1ULL << 62) /* The cluster reads as all zeros */ #define QCOW_OFLAG_ZERO (1ULL << 0) #define MIN_CLUSTER_BITS 9 #define MAX_CLUSTER_BITS 21 /* Must be at least 2 to cover COW */ #define MIN_L2_CACHE_SIZE 2 /* clusters */ /* Must be at least 4 to cover all cases of refcount table growth */ #define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */ /* Whichever is more */ #define DEFAULT_L2_CACHE_CLUSTERS 8 /* clusters */ #define DEFAULT_L2_CACHE_BYTE_SIZE 1048576 /* bytes */ /* The refblock cache needs only a fourth of the L2 cache size to cover as many * clusters */ #define DEFAULT_L2_REFCOUNT_SIZE_RATIO 4 #define DEFAULT_CLUSTER_SIZE 65536 #define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts" #define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request" #define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot" #define QCOW2_OPT_DISCARD_OTHER "pass-discard-other" #define QCOW2_OPT_OVERLAP "overlap-check" #define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template" #define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header" #define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1" #define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2" #define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table" #define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block" #define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table" #define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1" #define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2" #define QCOW2_OPT_CACHE_SIZE "cache-size" #define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size" #define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size" #define QCOW2_OPT_CACHE_CLEAN_INTERVAL "cache-clean-interval" typedef struct QCowHeader { uint32_t magic; uint32_t version; uint64_t backing_file_offset; uint32_t backing_file_size; uint32_t cluster_bits; uint64_t size; /* in bytes */ uint32_t crypt_method; uint32_t l1_size; /* XXX: save number of clusters instead ? */ uint64_t l1_table_offset; uint64_t refcount_table_offset; uint32_t refcount_table_clusters; uint32_t nb_snapshots; uint64_t snapshots_offset; /* The following fields are only valid for version >= 3 */ uint64_t incompatible_features; uint64_t compatible_features; uint64_t autoclear_features; uint32_t refcount_order; uint32_t header_length; } QEMU_PACKED QCowHeader; typedef struct QEMU_PACKED QCowSnapshotHeader { /* header is 8 byte aligned */ uint64_t l1_table_offset; uint32_t l1_size; uint16_t id_str_size; uint16_t name_size; uint32_t date_sec; uint32_t date_nsec; uint64_t vm_clock_nsec; uint32_t vm_state_size; uint32_t extra_data_size; /* for extension */ /* extra data follows */ /* id_str follows */ /* name follows */ } QCowSnapshotHeader; typedef struct QEMU_PACKED QCowSnapshotExtraData { uint64_t vm_state_size_large; uint64_t disk_size; } QCowSnapshotExtraData; typedef struct QCowSnapshot { uint64_t l1_table_offset; uint32_t l1_size; char *id_str; char *name; uint64_t disk_size; uint64_t vm_state_size; uint32_t date_sec; uint32_t date_nsec; uint64_t vm_clock_nsec; } QCowSnapshot; struct Qcow2Cache; typedef struct Qcow2Cache Qcow2Cache; typedef struct Qcow2CryptoHeaderExtension { uint64_t offset; uint64_t length; } QEMU_PACKED Qcow2CryptoHeaderExtension; typedef struct Qcow2UnknownHeaderExtension { uint32_t magic; uint32_t len; QLIST_ENTRY(Qcow2UnknownHeaderExtension) next; uint8_t data[]; } Qcow2UnknownHeaderExtension; enum { QCOW2_FEAT_TYPE_INCOMPATIBLE = 0, QCOW2_FEAT_TYPE_COMPATIBLE = 1, QCOW2_FEAT_TYPE_AUTOCLEAR = 2, }; /* Incompatible feature bits */ enum { QCOW2_INCOMPAT_DIRTY_BITNR = 0, QCOW2_INCOMPAT_CORRUPT_BITNR = 1, QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR, QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR, QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY | QCOW2_INCOMPAT_CORRUPT, }; /* Compatible feature bits */ enum { QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0, QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS, }; /* Autoclear feature bits */ enum { QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0, QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR, QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS, }; enum qcow2_discard_type { QCOW2_DISCARD_NEVER = 0, QCOW2_DISCARD_ALWAYS, QCOW2_DISCARD_REQUEST, QCOW2_DISCARD_SNAPSHOT, QCOW2_DISCARD_OTHER, QCOW2_DISCARD_MAX }; typedef struct Qcow2Feature { uint8_t type; uint8_t bit; char name[46]; } QEMU_PACKED Qcow2Feature; typedef struct Qcow2DiscardRegion { BlockDriverState *bs; uint64_t offset; uint64_t bytes; QTAILQ_ENTRY(Qcow2DiscardRegion) next; } Qcow2DiscardRegion; typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array, uint64_t index); typedef void Qcow2SetRefcountFunc(void *refcount_array, uint64_t index, uint64_t value); typedef struct Qcow2BitmapHeaderExt { uint32_t nb_bitmaps; uint32_t reserved32; uint64_t bitmap_directory_size; uint64_t bitmap_directory_offset; } QEMU_PACKED Qcow2BitmapHeaderExt; typedef struct BDRVQcow2State { int cluster_bits; int cluster_size; int cluster_sectors; int l2_bits; int l2_size; int l1_size; int l1_vm_state_index; int refcount_block_bits; int refcount_block_size; int csize_shift; int csize_mask; uint64_t cluster_offset_mask; uint64_t l1_table_offset; uint64_t *l1_table; Qcow2Cache* l2_table_cache; Qcow2Cache* refcount_block_cache; QEMUTimer *cache_clean_timer; unsigned cache_clean_interval; uint8_t *cluster_cache; uint8_t *cluster_data; uint64_t cluster_cache_offset; QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs; uint64_t *refcount_table; uint64_t refcount_table_offset; uint32_t refcount_table_size; uint32_t max_refcount_table_index; /* Last used entry in refcount_table */ uint64_t free_cluster_index; uint64_t free_byte_offset; CoMutex lock; Qcow2CryptoHeaderExtension crypto_header; /* QCow2 header extension */ QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */ QCryptoBlock *crypto; /* Disk encryption format driver */ bool crypt_physical_offset; /* Whether to use virtual or physical offset for encryption initialization vector tweak */ uint32_t crypt_method_header; uint64_t snapshots_offset; int snapshots_size; unsigned int nb_snapshots; QCowSnapshot *snapshots; uint32_t nb_bitmaps; uint64_t bitmap_directory_size; uint64_t bitmap_directory_offset; int flags; int qcow_version; bool use_lazy_refcounts; int refcount_order; int refcount_bits; uint64_t refcount_max; Qcow2GetRefcountFunc *get_refcount; Qcow2SetRefcountFunc *set_refcount; bool discard_passthrough[QCOW2_DISCARD_MAX]; int overlap_check; /* bitmask of Qcow2MetadataOverlap values */ bool signaled_corruption; uint64_t incompatible_features; uint64_t compatible_features; uint64_t autoclear_features; size_t unknown_header_fields_size; void* unknown_header_fields; QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext; QTAILQ_HEAD (, Qcow2DiscardRegion) discards; bool cache_discards; /* Backing file path and format as stored in the image (this is not the * effective path/format, which may be the result of a runtime option * override) */ char *image_backing_file; char *image_backing_format; } BDRVQcow2State; typedef struct Qcow2COWRegion { /** * Offset of the COW region in bytes from the start of the first cluster * touched by the request. */ unsigned offset; /** Number of bytes to copy */ unsigned nb_bytes; } Qcow2COWRegion; /** * Describes an in-flight (part of a) write request that writes to clusters * that are not referenced in their L2 table yet. */ typedef struct QCowL2Meta { /** Guest offset of the first newly allocated cluster */ uint64_t offset; /** Host offset of the first newly allocated cluster */ uint64_t alloc_offset; /** Number of newly allocated clusters */ int nb_clusters; /** Do not free the old clusters */ bool keep_old_clusters; /** * Requests that overlap with this allocation and wait to be restarted * when the allocating request has completed. */ CoQueue dependent_requests; /** * The COW Region between the start of the first allocated cluster and the * area the guest actually writes to. */ Qcow2COWRegion cow_start; /** * The COW Region between the area the guest actually writes to and the * end of the last allocated cluster. */ Qcow2COWRegion cow_end; /** * The I/O vector with the data from the actual guest write request. * If non-NULL, this is meant to be merged together with the data * from @cow_start and @cow_end into one single write operation. */ QEMUIOVector *data_qiov; /** Pointer to next L2Meta of the same write request */ struct QCowL2Meta *next; QLIST_ENTRY(QCowL2Meta) next_in_flight; } QCowL2Meta; typedef enum QCow2ClusterType { QCOW2_CLUSTER_UNALLOCATED, QCOW2_CLUSTER_ZERO_PLAIN, QCOW2_CLUSTER_ZERO_ALLOC, QCOW2_CLUSTER_NORMAL, QCOW2_CLUSTER_COMPRESSED, } QCow2ClusterType; typedef enum QCow2MetadataOverlap { QCOW2_OL_MAIN_HEADER_BITNR = 0, QCOW2_OL_ACTIVE_L1_BITNR = 1, QCOW2_OL_ACTIVE_L2_BITNR = 2, QCOW2_OL_REFCOUNT_TABLE_BITNR = 3, QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4, QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5, QCOW2_OL_INACTIVE_L1_BITNR = 6, QCOW2_OL_INACTIVE_L2_BITNR = 7, QCOW2_OL_MAX_BITNR = 8, QCOW2_OL_NONE = 0, QCOW2_OL_MAIN_HEADER = (1 << QCOW2_OL_MAIN_HEADER_BITNR), QCOW2_OL_ACTIVE_L1 = (1 << QCOW2_OL_ACTIVE_L1_BITNR), QCOW2_OL_ACTIVE_L2 = (1 << QCOW2_OL_ACTIVE_L2_BITNR), QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR), QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR), QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR), QCOW2_OL_INACTIVE_L1 = (1 << QCOW2_OL_INACTIVE_L1_BITNR), /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv * reads. */ QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR), } QCow2MetadataOverlap; /* Perform all overlap checks which can be done in constant time */ #define QCOW2_OL_CONSTANT \ (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \ QCOW2_OL_SNAPSHOT_TABLE) /* Perform all overlap checks which don't require disk access */ #define QCOW2_OL_CACHED \ (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \ QCOW2_OL_INACTIVE_L1) /* Perform all overlap checks */ #define QCOW2_OL_ALL \ (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2) #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL static inline int64_t start_of_cluster(BDRVQcow2State *s, int64_t offset) { return offset & ~(s->cluster_size - 1); } static inline int64_t offset_into_cluster(BDRVQcow2State *s, int64_t offset) { return offset & (s->cluster_size - 1); } static inline uint64_t size_to_clusters(BDRVQcow2State *s, uint64_t size) { return (size + (s->cluster_size - 1)) >> s->cluster_bits; } static inline int64_t size_to_l1(BDRVQcow2State *s, int64_t size) { int shift = s->cluster_bits + s->l2_bits; return (size + (1ULL << shift) - 1) >> shift; } static inline int offset_to_l2_index(BDRVQcow2State *s, int64_t offset) { return (offset >> s->cluster_bits) & (s->l2_size - 1); } static inline int64_t align_offset(int64_t offset, int n) { offset = (offset + n - 1) & ~(n - 1); return offset; } static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s) { return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); } static inline uint64_t qcow2_max_refcount_clusters(BDRVQcow2State *s) { return QCOW_MAX_REFTABLE_SIZE >> s->cluster_bits; } static inline QCow2ClusterType qcow2_get_cluster_type(uint64_t l2_entry) { if (l2_entry & QCOW_OFLAG_COMPRESSED) { return QCOW2_CLUSTER_COMPRESSED; } else if (l2_entry & QCOW_OFLAG_ZERO) { if (l2_entry & L2E_OFFSET_MASK) { return QCOW2_CLUSTER_ZERO_ALLOC; } return QCOW2_CLUSTER_ZERO_PLAIN; } else if (!(l2_entry & L2E_OFFSET_MASK)) { return QCOW2_CLUSTER_UNALLOCATED; } else { return QCOW2_CLUSTER_NORMAL; } } /* Check whether refcounts are eager or lazy */ static inline bool qcow2_need_accurate_refcounts(BDRVQcow2State *s) { return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY); } static inline uint64_t l2meta_cow_start(QCowL2Meta *m) { return m->offset + m->cow_start.offset; } static inline uint64_t l2meta_cow_end(QCowL2Meta *m) { return m->offset + m->cow_end.offset + m->cow_end.nb_bytes; } static inline uint64_t refcount_diff(uint64_t r1, uint64_t r2) { return r1 > r2 ? r1 - r2 : r2 - r1; } /* qcow2.c functions */ int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, int64_t sector_num, int nb_sectors); int qcow2_mark_dirty(BlockDriverState *bs); int qcow2_mark_corrupt(BlockDriverState *bs); int qcow2_mark_consistent(BlockDriverState *bs); int qcow2_update_header(BlockDriverState *bs); void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, int64_t size, const char *message_format, ...) GCC_FMT_ATTR(5, 6); /* qcow2-refcount.c functions */ int qcow2_refcount_init(BlockDriverState *bs); void qcow2_refcount_close(BlockDriverState *bs); int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index, uint64_t *refcount); int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index, uint64_t addend, bool decrease, enum qcow2_discard_type type); int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size); int64_t qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset, int64_t nb_clusters); int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size); void qcow2_free_clusters(BlockDriverState *bs, int64_t offset, int64_t size, enum qcow2_discard_type type); void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry, int nb_clusters, enum qcow2_discard_type type); int qcow2_update_snapshot_refcount(BlockDriverState *bs, int64_t l1_table_offset, int l1_size, int addend); int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); void qcow2_process_discards(BlockDriverState *bs, int ret); int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset, int64_t size); int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset, int64_t size); int qcow2_inc_refcounts_imrt(BlockDriverState *bs, BdrvCheckResult *res, void **refcount_table, int64_t *refcount_table_size, int64_t offset, int64_t size); int qcow2_change_refcount_order(BlockDriverState *bs, int refcount_order, BlockDriverAmendStatusCB *status_cb, void *cb_opaque, Error **errp); /* qcow2-cluster.c functions */ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size, bool exact_size); int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index); int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); int qcow2_encrypt_sectors(BDRVQcow2State *s, int64_t sector_num, uint8_t *buf, int nb_sectors, bool enc, Error **errp); int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, unsigned int *bytes, uint64_t *cluster_offset); int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, unsigned int *bytes, uint64_t *host_offset, QCowL2Meta **m); uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs, uint64_t offset, int compressed_size); int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m); int qcow2_cluster_discard(BlockDriverState *bs, uint64_t offset, uint64_t bytes, enum qcow2_discard_type type, bool full_discard); int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset, uint64_t bytes, int flags); int qcow2_expand_zero_clusters(BlockDriverState *bs, BlockDriverAmendStatusCB *status_cb, void *cb_opaque); /* qcow2-snapshot.c functions */ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info); int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id); int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id, const char *name, Error **errp); int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab); int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_id, const char *name, Error **errp); void qcow2_free_snapshots(BlockDriverState *bs); int qcow2_read_snapshots(BlockDriverState *bs); /* qcow2-cache.c functions */ Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables); int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c); void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c, void *table); int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c); int qcow2_cache_write(BlockDriverState *bs, Qcow2Cache *c); int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c, Qcow2Cache *dependency); void qcow2_cache_depends_on_flush(Qcow2Cache *c); void qcow2_cache_clean_unused(BlockDriverState *bs, Qcow2Cache *c); int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c); int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, void **table); int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, void **table); void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table); /* qcow2-bitmap.c functions */ int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res, void **refcount_table, int64_t *refcount_table_size); bool qcow2_load_autoloading_dirty_bitmaps(BlockDriverState *bs, Error **errp); int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp); void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp); #endif