564 pub struct BlockAsync {  struct
565     kill_evt: Option<Event>,
566     worker_thread: Option<thread::JoinHandle<(Box<dyn ToAsyncDisk>, Option<Tube>)>>,
567     disk_image: Option<Box<dyn ToAsyncDisk>>,
568     disk_size: Arc<AtomicU64>,
569     avail_features: u64,
570     read_only: bool,
571     sparse: bool,
595 impl BlockAsync {  argument
605     ) -> SysResult<BlockAsync> {  in new()
825 impl Drop for BlockAsync {  implementation
838 impl VirtioDevice for BlockAsync {  implementation