Re: [RFC PATCH 0/4] Asynchronous passthrough ioctl

[Kanchan Joshi]

On Thu, Jan 28, 2021 at 8:20 PM Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> On 1/28/21 5:04 AM, Kanchan Joshi wrote:
> > And for some ioctls, driver may still need to use task-work to update
> > the user-space pointers (embedded in uring/ioctl cmd) during
> > completion.
>
> For this use case, we should ensure that just io_uring handles this
> part. It's already got everything setup for it, and I'd rather avoid
> having drivers touch any of those parts. Could be done by having an
> io_uring helper ala:
>
> io_uring_cmd_complete_in_task(cmd, handler);
>
> which takes care of the nitty gritty details.

Ah right. With that, I can do away with exporting task-work.
NVMe completion can invoke (depending on ioctl) this uring-helper with
a handler that does the ioctl-specific update in task context.



-- 
Kanchan