Re: [PATCH RFC] io_uring: extend io_uring_sqe flags bits

[Pavel Begunkov <asml.silence@gmail.com>]

On 10/31/24 21:22, Jens Axboe wrote:
> In hindsight everything is clearer, but it probably should've been known
> that 8 bits of ->flags would run out sooner than later. Rather than
> gobble up the last bit for a random use case, add a bit that controls
> whether or not ->personality is used as a flags2 argument. If that is
> the case, then there's a new IOSQE2_PERSONALITY flag that tells io_uring
> which personality field to read.
> 
> While this isn't the prettiest, it does allow extending with 15 extra
> flags, and retains being able to use personality with any kind of
> command. The exception is uring cmd, where personality2 will overlap
> with the space set aside for SQE128. If they really need that, then that
> would have to be done via a uring cmd flag.

Interesting, I was just experimenting using the personality bits for
similar purposes I mentioned but in a different way, and I even thought
if anything it could be used to extend sqe flags though I'm not a huge
fan of that.

-- 
Pavel Begunkov