what is the return value of:

Hoi, When writting a Rados/Rbd client I noticed that the sequence:     r = rbd_aio_readv(ri->ri_image, iov, iovcnt, offset, comp);     r = rbd_aio_wait_for_complete(comp);     nbytes = rbd_aio_get_return_value(comp); returns the number of bytes read in nbytes. Now if I do the same but with `rbd_aio_write(v)` I only receive zero as value... I would have expected that rbd_aio_get_return_value would more or less function like aio_return(2): DESCRIPTION      The aio_return() system call returns the final status of the asynchronous      I/O request associated with the structure pointed to by iocb. RETURN VALUES      If the asynchronous I/O request has completed, the status is returned as      described in read(2), write(2), or fsync(2).  Otherwise, aio_return()      returns -1 and sets errno to indicate the error condition. So I was expecting the amount of bytes written? --WjW