On 05/28/2017 04:27 AM, Christoph Hellwig wrote:

quoted

 Changes since v8:
 + Err out AIO reads with -EINVAL flagged as RWF_NOWAIT

Ugg, why?  Reads aren't really treated any different than writes in
the direct I/O code.

This effort focused on writes only.

From the point of view of the application/user, reads are usually

required to complete with success. I don't see a scenario where reads()
would need the nowait feature. If there is a use case, I'd be happy to
add and support it.

-- 
Goldwyn