On Wed, Jan 27, 2021 at 03:48:10PM +0000, Pavel Begunkov wrote:

On 16/01/2021 05:18, Al Viro wrote:

quoted

On Sat, Jan 09, 2021 at 10:11:09PM +0000, Pavel Begunkov wrote:

quoted

quoted

Does any code actually look at the fields as a pair?
Would it even be better to use separate bytes?
Even growing the on-stack structure by a word won't really matter.

u8 type, rw;

That won't bloat the struct. I like the idea. If used together compilers
can treat it as u16.

Reasonable, and from what I remember from looking through the users,
no readers will bother with looking at both at the same time.

Al, are you going turn it into a patch, or prefer me to take over?

I'll massage that a bit and put into #work.iov_iter - just need to dig my
way from under the pile of ->d_revalidate() review...