On Wed, Mar 01, 2017 at 10:57:17AM -0600, Goldwyn Rodrigues wrote: > RWF_* ? Isn't that kernel space flags? Or did you intend to say > IOCB_FLAG_*? No, they are the flags for preadv2/pwritev2. > If yes, we maintain two flag fields? aio_reserved1 (perhaps > renamed to aio_flags2) and aio_flags? Yes - I'd call it aio_rw_flags or similar. > aio_reserved1 is also used to return key for the purpose of io_cancel, > but we should be able to fetch the flags before putting the key value > there. Still I am not comfortable using the same field for it because it > will be overwritten when io_submit returns. It's not - the key is a separate field. It's just that the two are defined using a very strange macro switching around their positions based on the endiannes. > Which brings me to the next question: What is the purpose of aio_key? > Why is aio_key set to KIOCB_KEY (which is zero) every time? You are not > differentiating the request by setting all the iocb's key to zero. I don't know the history of this rather odd field.
