Trait AsyncZeroCopyWriter

pub trait AsyncZeroCopyWriter: ZeroCopyWriter {
    // Required method
    fn async_write_from<'life0, 'async_trait>(
        &'life0 mut self,
        f: Arc<dyn AsyncFileReadWriteVolatile>,
        count: usize,
        off: u64,
    ) -> Pin<Box<dyn Future<Output = Result<usize>> + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
}

A trait for directly copying data from a RawFd into the fuse transport without first storing it in an intermediate buffer in asynchronous mode.

Required Methods

fn async_write_from<'life0, 'async_trait>( &'life0 mut self, f: Arc<dyn AsyncFileReadWriteVolatile>, count: usize, off: u64, ) -> Pin<Box<dyn Future<Output = Result<usize>> + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Copies at most count bytes from f at offset off directly into self without storing it in any intermediate buffers. If the return value is Ok(n) then it must be guaranteed that 0 <= n <= count. If n is 0, then it can indicate one of 3 possibilities:

1. There is no more data left in f.
2. There is no more space in self.
3. count was 0.

Errors

If any error is returned then the implementation must guarantee that no bytes were copied from f. If the underlying read from f returns 0 then the implementation must return an error of the kind io::ErrorKind::UnexpectedEof.

Implementors