Re: [PATCH v3 2/3] fs: Convert kiocb rw_hint from enum to u16

From: Theodore Y. Ts'o
Date: Wed May 09 2018 - 11:21:59 EST

On Wed, May 09, 2018 at 08:23:00AM -0600, Jens Axboe wrote:
> Streams is essentially the only thing ki_hint is currently used for,
> with the write life time hints mapping to a stream. The idea for the
> user side API was to have other things than just write life time hints.
> Since Adam wants to do priorities, he'd either need to pack into the
> existing ki_hint, or do this patch does, which is make it smaller and
> add a new member. I think the latter is cleaner.

Fair enough; but maybe we can use a u8 instead of a u16? 65,535
priorities still seem like way more than would ever make sense. I
think 256 priorities is still way to many, but it's simpler while
still reserving number of bits for future se.

- Ted