Re: [PATCH 6/6] fs: replace f_ops->get_poll_head with a static ->f_poll_head pointer

On Thu, Jun 28, 2018 at 4:37 PM Al Viro [off-list ref] wrote:

You underestimate the nastiness of that thing (and for the record, I'm
a lot *less* fond of AIO than you are, what with having had to read that
nest of horrors lately).  It does not "copy the data to userland"; what it
does instead is copying into an array of pages it keeps, right from
IO completion callback.  I

Ugh.

Oh well. I'd be perfectly happy to have somebody re-write and
re-architect the aio code entirely.  Much rather than that the
->poll() code. Because I know which one I think is well-desiged with a
nice usable interface, and which one is a pile of shit.

In the meantime, if AIO wants to do poll() in some irq callback, may I
suggest just using workqueues.

            Linus