LXR qemu/include/block/block.h

   1#ifndef BLOCK_H
   2#define BLOCK_H
   3
   4#include "block/aio.h"
   5#include "qemu-common.h"
   6#include "qemu/option.h"
   7#include "block/coroutine.h"
   8#include "qapi/qmp/qobject.h"
   9#include "qapi-types.h"
  10
  11/* block.c */
  12typedef struct BlockDriver BlockDriver;
  13typedef struct BlockJob BlockJob;
  14
  15typedef struct BlockDriverInfo {
  16    /* in bytes, 0 if irrelevant */
  17    int cluster_size;
  18    /* offset at which the VM state can be saved (0 if not possible) */
  19    int64_t vm_state_offset;
  20    bool is_dirty;
  21    /*
  22     * True if unallocated blocks read back as zeroes. This is equivalent
  23     * to the the LBPRZ flag in the SCSI logical block provisioning page.
  24     */
  25    bool unallocated_blocks_are_zero;
  26    /*
  27     * True if the driver can optimize writing zeroes by unmapping
  28     * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
  29     * with the difference that in qemu a discard is allowed to silently
  30     * fail. Therefore we have to use bdrv_write_zeroes with the
  31     * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
  32     * After this call the driver has to guarantee that the contents read
  33     * back as zero. It is additionally required that the block device is
  34     * opened with BDRV_O_UNMAP flag for this to work.
  35     */
  36    bool can_write_zeroes_with_unmap;
  37} BlockDriverInfo;
  38
  39typedef struct BlockFragInfo {
  40    uint64_t allocated_clusters;
  41    uint64_t total_clusters;
  42    uint64_t fragmented_clusters;
  43    uint64_t compressed_clusters;
  44} BlockFragInfo;
  45
  46/* Callbacks for block device models */
  47typedef struct BlockDevOps {
  48    /*
  49     * Runs when virtual media changed (monitor commands eject, change)
  50     * Argument load is true on load and false on eject.
  51     * Beware: doesn't run when a host device's physical media
  52     * changes.  Sure would be useful if it did.
  53     * Device models with removable media must implement this callback.
  54     */
  55    void (*change_media_cb)(void *opaque, bool load);
  56    /*
  57     * Runs when an eject request is issued from the monitor, the tray
  58     * is closed, and the medium is locked.
  59     * Device models that do not implement is_medium_locked will not need
  60     * this callback.  Device models that can lock the medium or tray might
  61     * want to implement the callback and unlock the tray when "force" is
  62     * true, even if they do not support eject requests.
  63     */
  64    void (*eject_request_cb)(void *opaque, bool force);
  65    /*
  66     * Is the virtual tray open?
  67     * Device models implement this only when the device has a tray.
  68     */
  69    bool (*is_tray_open)(void *opaque);
  70    /*
  71     * Is the virtual medium locked into the device?
  72     * Device models implement this only when device has such a lock.
  73     */
  74    bool (*is_medium_locked)(void *opaque);
  75    /*
  76     * Runs when the size changed (e.g. monitor command block_resize)
  77     */
  78    void (*resize_cb)(void *opaque);
  79} BlockDevOps;
  80
  81typedef enum {
  82    BDRV_REQ_COPY_ON_READ = 0x1,
  83    BDRV_REQ_ZERO_WRITE   = 0x2,
  84    /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
  85     * is allowed to optimize a write zeroes request by unmapping (discarding)
  86     * blocks if it is guaranteed that the result will read back as
  87     * zeroes. The flag is only passed to the driver if the block device is
  88     * opened with BDRV_O_UNMAP.
  89     */
  90    BDRV_REQ_MAY_UNMAP    = 0x4,
  91} BdrvRequestFlags;
  92
  93#define BDRV_O_RDWR        0x0002
  94#define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  95#define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  96#define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  97#define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  98#define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  99#define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
 100#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
 101#define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
 102#define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
 103#define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
 104#define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
 105#define BDRV_O_PROTOCOL    0x8000  /* if no block driver is explicitly given:
 106                                      select an appropriate protocol driver,
 107                                      ignoring the format layer */
 108
 109#define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
 110
 111#define BDRV_SECTOR_BITS   9
 112#define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
 113#define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
 114
 115/* BDRV_BLOCK_DATA: data is read from bs->file or another file
 116 * BDRV_BLOCK_ZERO: sectors read as zero
 117 * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
 118 * BDRV_BLOCK_RAW: used internally to indicate that the request
 119 *                 was answered by the raw driver and that one
 120 *                 should look in bs->file directly.
 121 *
 122 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
 123 * bs->file where sector data can be read from as raw data.
 124 *
 125 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 126 *
 127 * DATA ZERO OFFSET_VALID
 128 *  t    t        t       sectors read as zero, bs->file is zero at offset
 129 *  t    f        t       sectors read as valid from bs->file at offset
 130 *  f    t        t       sectors preallocated, read as zero, bs->file not
 131 *                        necessarily zero at offset
 132 *  f    f        t       sectors preallocated but read from backing_hd,
 133 *                        bs->file contains garbage at offset
 134 *  t    t        f       sectors preallocated, read as zero, unknown offset
 135 *  t    f        f       sectors read from unknown file or offset
 136 *  f    t        f       not allocated or unknown offset, read as zero
 137 *  f    f        f       not allocated or unknown offset, read from backing_hd
 138 */
 139#define BDRV_BLOCK_DATA         1
 140#define BDRV_BLOCK_ZERO         2
 141#define BDRV_BLOCK_OFFSET_VALID 4
 142#define BDRV_BLOCK_RAW          8
 143#define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 144
 145typedef enum {
 146    BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
 147} BlockErrorAction;
 148
 149typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 150
 151typedef struct BDRVReopenState {
 152    BlockDriverState *bs;
 153    int flags;
 154    void *opaque;
 155} BDRVReopenState;
 156
 157
 158void bdrv_iostatus_enable(BlockDriverState *bs);
 159void bdrv_iostatus_reset(BlockDriverState *bs);
 160void bdrv_iostatus_disable(BlockDriverState *bs);
 161bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 162void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 163void bdrv_info_print(Monitor *mon, const QObject *data);
 164void bdrv_info(Monitor *mon, QObject **ret_data);
 165void bdrv_stats_print(Monitor *mon, const QObject *data);
 166void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 167
 168/* disk I/O throttling */
 169void bdrv_io_limits_enable(BlockDriverState *bs);
 170void bdrv_io_limits_disable(BlockDriverState *bs);
 171
 172void bdrv_init(void);
 173void bdrv_init_with_whitelist(void);
 174BlockDriver *bdrv_find_protocol(const char *filename,
 175                                bool allow_protocol_prefix);
 176BlockDriver *bdrv_find_format(const char *format_name);
 177BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 178                                          bool readonly);
 179int bdrv_create(BlockDriver *drv, const char* filename,
 180    QEMUOptionParameter *options, Error **errp);
 181int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
 182                     Error **errp);
 183BlockDriverState *bdrv_new(const char *device_name);
 184void bdrv_make_anon(BlockDriverState *bs);
 185void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 186void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 187int bdrv_parse_cache_flags(const char *mode, int *flags);
 188int bdrv_parse_discard_flags(const char *mode, int *flags);
 189int bdrv_open_image(BlockDriverState **pbs, const char *filename,
 190                    QDict *options, const char *bdref_key, int flags,
 191                    bool allow_none, Error **errp);
 192int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 193void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp);
 194int bdrv_open(BlockDriverState **pbs, const char *filename,
 195              const char *reference, QDict *options, int flags,
 196              BlockDriver *drv, Error **errp);
 197BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 198                                    BlockDriverState *bs, int flags);
 199int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 200int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 201int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 202                        BlockReopenQueue *queue, Error **errp);
 203void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 204void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 205void bdrv_close(BlockDriverState *bs);
 206void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 207int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 208void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 209void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 210void *bdrv_get_attached_dev(BlockDriverState *bs);
 211void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 212                      void *opaque);
 213void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
 214bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 215bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 216bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 217int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 218              uint8_t *buf, int nb_sectors);
 219int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 220                          uint8_t *buf, int nb_sectors);
 221int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 222               const uint8_t *buf, int nb_sectors);
 223int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 224               int nb_sectors, BdrvRequestFlags flags);
 225BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 226                                        int nb_sectors, BdrvRequestFlags flags,
 227                                        BlockDriverCompletionFunc *cb, void *opaque);
 228int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 229int bdrv_pread(BlockDriverState *bs, int64_t offset,
 230               void *buf, int count);
 231int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 232                const void *buf, int count);
 233int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 234int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 235    const void *buf, int count);
 236int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 237    int nb_sectors, QEMUIOVector *qiov);
 238int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 239    int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 240int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 241    int nb_sectors, QEMUIOVector *qiov);
 242/*
 243 * Efficiently zero a region of the disk image.  Note that this is a regular
 244 * I/O request like read or write and should have a reasonable size.  This
 245 * function is not suitable for zeroing the entire image in a single request
 246 * because it may allocate memory for the entire region.
 247 */
 248int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 249    int nb_sectors, BdrvRequestFlags flags);
 250BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 251    const char *backing_file);
 252int bdrv_get_backing_file_depth(BlockDriverState *bs);
 253int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 254int64_t bdrv_getlength(BlockDriverState *bs);
 255int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 256void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 257int bdrv_refresh_limits(BlockDriverState *bs);
 258int bdrv_commit(BlockDriverState *bs);
 259int bdrv_commit_all(void);
 260int bdrv_change_backing_file(BlockDriverState *bs,
 261    const char *backing_file, const char *backing_fmt);
 262void bdrv_register(BlockDriver *bdrv);
 263int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 264                           BlockDriverState *base);
 265BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 266                                    BlockDriverState *bs);
 267BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 268
 269
 270typedef struct BdrvCheckResult {
 271    int corruptions;
 272    int leaks;
 273    int check_errors;
 274    int corruptions_fixed;
 275    int leaks_fixed;
 276    int64_t image_end_offset;
 277    BlockFragInfo bfi;
 278} BdrvCheckResult;
 279
 280typedef enum {
 281    BDRV_FIX_LEAKS    = 1,
 282    BDRV_FIX_ERRORS   = 2,
 283} BdrvCheckMode;
 284
 285int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 286
 287int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
 288
 289/* external snapshots */
 290bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
 291                                      BlockDriverState *candidate);
 292bool bdrv_is_first_non_filter(BlockDriverState *candidate);
 293
 294/* async block I/O */
 295typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 296                                     int sector_num);
 297BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 298                                 QEMUIOVector *iov, int nb_sectors,
 299                                 BlockDriverCompletionFunc *cb, void *opaque);
 300BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 301                                  QEMUIOVector *iov, int nb_sectors,
 302                                  BlockDriverCompletionFunc *cb, void *opaque);
 303BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 304                                 BlockDriverCompletionFunc *cb, void *opaque);
 305BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 306                                   int64_t sector_num, int nb_sectors,
 307                                   BlockDriverCompletionFunc *cb, void *opaque);
 308void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 309
 310typedef struct BlockRequest {
 311    /* Fields to be filled by multiwrite caller */
 312    int64_t sector;
 313    int nb_sectors;
 314    int flags;
 315    QEMUIOVector *qiov;
 316    BlockDriverCompletionFunc *cb;
 317    void *opaque;
 318
 319    /* Filled by multiwrite implementation */
 320    int error;
 321} BlockRequest;
 322
 323int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 324    int num_reqs);
 325
 326/* sg packet commands */
 327int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 328BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 329        unsigned long int req, void *buf,
 330        BlockDriverCompletionFunc *cb, void *opaque);
 331
 332/* Invalidate any cached metadata used by image formats */
 333void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
 334void bdrv_invalidate_cache_all(Error **errp);
 335
 336void bdrv_clear_incoming_migration_all(void);
 337
 338/* Ensure contents are flushed to disk.  */
 339int bdrv_flush(BlockDriverState *bs);
 340int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 341int bdrv_flush_all(void);
 342void bdrv_close_all(void);
 343void bdrv_drain_all(void);
 344
 345int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 346int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 347int bdrv_has_zero_init_1(BlockDriverState *bs);
 348int bdrv_has_zero_init(BlockDriverState *bs);
 349bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
 350bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 351int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 352                              int nb_sectors, int *pnum);
 353int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 354                      int *pnum);
 355int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 356                            int64_t sector_num, int nb_sectors, int *pnum);
 357
 358void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 359                       BlockdevOnError on_write_error);
 360BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 361BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 362void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 363                       bool is_read, int error);
 364int bdrv_is_read_only(BlockDriverState *bs);
 365int bdrv_is_sg(BlockDriverState *bs);
 366int bdrv_enable_write_cache(BlockDriverState *bs);
 367void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 368int bdrv_is_inserted(BlockDriverState *bs);
 369int bdrv_media_changed(BlockDriverState *bs);
 370void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 371void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 372const char *bdrv_get_format_name(BlockDriverState *bs);
 373BlockDriverState *bdrv_find(const char *name);
 374BlockDriverState *bdrv_find_node(const char *node_name);
 375BlockDeviceInfoList *bdrv_named_nodes_list(void);
 376BlockDriverState *bdrv_lookup_bs(const char *device,
 377                                 const char *node_name,
 378                                 Error **errp);
 379BlockDriverState *bdrv_next(BlockDriverState *bs);
 380void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 381                  void *opaque);
 382int bdrv_is_encrypted(BlockDriverState *bs);
 383int bdrv_key_required(BlockDriverState *bs);
 384int bdrv_set_key(BlockDriverState *bs, const char *key);
 385int bdrv_query_missing_keys(void);
 386void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 387                         void *opaque);
 388const char *bdrv_get_device_name(BlockDriverState *bs);
 389int bdrv_get_flags(BlockDriverState *bs);
 390int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 391                          const uint8_t *buf, int nb_sectors);
 392int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 393ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 394void bdrv_round_to_clusters(BlockDriverState *bs,
 395                            int64_t sector_num, int nb_sectors,
 396                            int64_t *cluster_sector_num,
 397                            int *cluster_nb_sectors);
 398
 399const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 400void bdrv_get_backing_filename(BlockDriverState *bs,
 401                               char *filename, int filename_size);
 402void bdrv_get_full_backing_filename(BlockDriverState *bs,
 403                                    char *dest, size_t sz);
 404int bdrv_is_snapshot(BlockDriverState *bs);
 405
 406int path_is_absolute(const char *path);
 407void path_combine(char *dest, int dest_size,
 408                  const char *base_path,
 409                  const char *filename);
 410
 411int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 412int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 413                      int64_t pos, int size);
 414
 415int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 416                      int64_t pos, int size);
 417
 418void bdrv_img_create(const char *filename, const char *fmt,
 419                     const char *base_filename, const char *base_fmt,
 420                     char *options, uint64_t img_size, int flags,
 421                     Error **errp, bool quiet);
 422
 423/* Returns the alignment in bytes that is required so that no bounce buffer
 424 * is required throughout the stack */
 425size_t bdrv_opt_mem_align(BlockDriverState *bs);
 426void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
 427void *qemu_blockalign(BlockDriverState *bs, size_t size);
 428bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 429
 430struct HBitmapIter;
 431typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 432BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity);
 433void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 434BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 435int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 436void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 437void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 438void bdrv_dirty_iter_init(BlockDriverState *bs,
 439                          BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 440int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 441
 442void bdrv_enable_copy_on_read(BlockDriverState *bs);
 443void bdrv_disable_copy_on_read(BlockDriverState *bs);
 444
 445void bdrv_ref(BlockDriverState *bs);
 446void bdrv_unref(BlockDriverState *bs);
 447void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 448int bdrv_in_use(BlockDriverState *bs);
 449
 450#ifdef CONFIG_LINUX_AIO
 451int raw_get_aio_fd(BlockDriverState *bs);
 452#else
 453static inline int raw_get_aio_fd(BlockDriverState *bs)
 454{
 455    return -ENOTSUP;
 456}
 457#endif
 458
 459enum BlockAcctType {
 460    BDRV_ACCT_READ,
 461    BDRV_ACCT_WRITE,
 462    BDRV_ACCT_FLUSH,
 463    BDRV_MAX_IOTYPE,
 464};
 465
 466typedef struct BlockAcctCookie {
 467    int64_t bytes;
 468    int64_t start_time_ns;
 469    enum BlockAcctType type;
 470} BlockAcctCookie;
 471
 472void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 473        int64_t bytes, enum BlockAcctType type);
 474void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 475
 476typedef enum {
 477    BLKDBG_L1_UPDATE,
 478
 479    BLKDBG_L1_GROW_ALLOC_TABLE,
 480    BLKDBG_L1_GROW_WRITE_TABLE,
 481    BLKDBG_L1_GROW_ACTIVATE_TABLE,
 482
 483    BLKDBG_L2_LOAD,
 484    BLKDBG_L2_UPDATE,
 485    BLKDBG_L2_UPDATE_COMPRESSED,
 486    BLKDBG_L2_ALLOC_COW_READ,
 487    BLKDBG_L2_ALLOC_WRITE,
 488
 489    BLKDBG_READ_AIO,
 490    BLKDBG_READ_BACKING_AIO,
 491    BLKDBG_READ_COMPRESSED,
 492
 493    BLKDBG_WRITE_AIO,
 494    BLKDBG_WRITE_COMPRESSED,
 495
 496    BLKDBG_VMSTATE_LOAD,
 497    BLKDBG_VMSTATE_SAVE,
 498
 499    BLKDBG_COW_READ,
 500    BLKDBG_COW_WRITE,
 501
 502    BLKDBG_REFTABLE_LOAD,
 503    BLKDBG_REFTABLE_GROW,
 504    BLKDBG_REFTABLE_UPDATE,
 505
 506    BLKDBG_REFBLOCK_LOAD,
 507    BLKDBG_REFBLOCK_UPDATE,
 508    BLKDBG_REFBLOCK_UPDATE_PART,
 509    BLKDBG_REFBLOCK_ALLOC,
 510    BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 511    BLKDBG_REFBLOCK_ALLOC_WRITE,
 512    BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 513    BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 514    BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 515
 516    BLKDBG_CLUSTER_ALLOC,
 517    BLKDBG_CLUSTER_ALLOC_BYTES,
 518    BLKDBG_CLUSTER_FREE,
 519
 520    BLKDBG_FLUSH_TO_OS,
 521    BLKDBG_FLUSH_TO_DISK,
 522
 523    BLKDBG_PWRITEV_RMW_HEAD,
 524    BLKDBG_PWRITEV_RMW_AFTER_HEAD,
 525    BLKDBG_PWRITEV_RMW_TAIL,
 526    BLKDBG_PWRITEV_RMW_AFTER_TAIL,
 527    BLKDBG_PWRITEV,
 528    BLKDBG_PWRITEV_ZERO,
 529    BLKDBG_PWRITEV_DONE,
 530
 531    BLKDBG_EVENT_MAX,
 532} BlkDebugEvent;
 533
 534#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 535void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 536
 537int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 538                           const char *tag);
 539int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 540int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 541bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 542
 543#endif
 544