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       drivers. They are not used by the block driver */
    BlockdevOnError on_read_error, on_write_error;
    bool iostatus_enabled;
    BlockDeviceIoStatus iostatus;
    char device_name[32];
    HBitmap *dirty_bitmap;
    int refcnt;
    int in_use; /* users other than guest access, eg. block migration */
    QTAILQ_ENTRY(BlockDriverState) list;

    QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;

    /* long-running background operation */
    BlockJob *job;

    QDict *options;
};

int get_tmp_filename(char *filename, int size);

void bdrv_set_io_limits(BlockDriverState *bs,
                        ThrottleConfig *cfg);


/**
 * bdrv_add_before_write_notifier:
 *
 * Register a callback that is invoked before write requests are processed but
 * after any throttling or waiting for overlapping requests.
 */
void bdrv_add_before_write_notifier(BlockDriverState *bs,
                                    NotifierWithReturn *notifier);

/**
 * bdrv_get_aio_context:
 *
 * Returns: the currently bound #AioContext
 */
AioContext *bdrv_get_aio_context(BlockDriverState *bs);

#ifdef _WIN32
int is_windows_drive(const char *filename);
#endif
void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
                               enum MonitorEvent ev,
                               BlockErrorAction action, bool is_read);

/**
 * stream_start:
 * @bs: Block device to operate on.
 * @base: Block device that will become the new base, or %NULL to
 * flatten the whole backing file chain onto @bs.
 * @base_id: The file name that will be written to @bs as the new
 * backing file if the job completes.  Ignored if @base is %NULL.
 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
 * @on_error: The action to take upon error.
 * @cb: Completion function for the job.
 * @opaque: Opaque pointer value passed to @cb.
 * @errp: Error object.
 *
 * Start a streaming operation on @bs.  Clusters that are unallocated
 * in @bs, but allocated in any image between @base and @bs (both
 * exclusive) will be written to @bs.  At the end of a successful
 * streaming job, the backing file of @bs will be changed to
 * @base_id in the written image and to @base in the live BlockDriverState.
 */
void stream_start(BlockDriverState *bs, BlockDriverState *base,
                  const char *base_id, int64_t speed, BlockdevOnError on_error,
                  BlockDriverCompletionFunc *cb,
                  void *opaque, Error **errp);

/**
 * commit_start:
 * @bs: Top Block device
 * @base: Block device that will be written into, and become the new top
 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
 * @on_error: The action to take upon error.
 * @cb: Completion function for the job.
 * @opaque: Opaque pointer value passed to @cb.
 * @errp: Error object.
 *
 */
void commit_start(BlockDriverState *bs, BlockDriverState *base,
                 BlockDriverState *top, int64_t speed,
                 BlockdevOnError on_error, BlockDriverCompletionFunc *cb,
                 void *opaque, Error **errp);

/*
 * mirror_start:
 * @bs: Block device to operate on.
 * @target: Block device to write to.
 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
 * @granularity: The chosen granularity for the dirty bitmap.
 * @buf_size: The amount of data that can be in flight at one time.
 * @mode: Whether to collapse all images in the chain to the target.
 * @on_source_error: The action to take upon error reading from the source.
 * @on_target_error: The action to take upon error writing to the target.
 * @cb: Completion function for the job.
 * @opaque: Opaque pointer value passed to @cb.
 * @errp: Error object.
 *
 * Start a mirroring operation on @bs.  Clusters that are allocated
 * in @bs will be written to @bs until the job is cancelled or
 * manually completed.  At the end of a successful mirroring job,
 * @bs will be switched to read from @target.
 */
void mirror_start(BlockDriverState *bs, BlockDriverState *target,
                  int64_t speed, int64_t granularity, int64_t buf_size,
                  MirrorSyncMode mode, BlockdevOnError on_source_error,
                  BlockdevOnError on_target_error,
                  BlockDriverCompletionFunc *cb,
                  void *opaque, Error **errp);

/*
 * backup_start:
 * @bs: Block device to operate on.
 * @target: Block device to write to.
 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
 * @sync_mode: What parts of the disk image should be copied to the destination.
 * @on_source_error: The action to take upon error reading from the source.
 * @on_target_error: The action to take upon error writing to the target.
 * @cb: Completion function for the job.
 * @opaque: Opaque pointer value passed to @cb.
 *