Function nbd_async::serve_local_nbd

pub async fn serve_local_nbd<P, B>(
    path: P, 
    block_size: u32, 
    block_count: u64, 
    read_only: bool, 
    block_device: B
) -> Result<()> where
    P: AsRef<Path>,
    B: Unpin + BlockDevice, 

Serve a local block device through a NBD dev file.