On Mon, Aug 24, 2015 at 11:02:42AM +0300, Artem Bityutskiy wrote: > Back when we were writing UBIFS, we did not need direct IO, so we did > not implement it. But yes, probably someone who cares could just try > implementing this feature. So I think the answer here is to implement a real version insted of adding hacks to pretend it is supported.