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Date:	Sat, 29 Dec 2012 15:47:37 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, Zach Brown <zab@...hat.com>,
	bcrl@...ck.org, jmoyer@...hat.com, axboe@...nel.dk,
	viro@...iv.linux.org.uk, tytso@....edu
Subject: Re: [PATCH 04/32] aio: remove retry-based AIO

On Thu, Dec 27, 2012 at 9:59 AM, Kent Overstreet <koverstreet@...gle.com> wrote:
> @@ -1585,18 +1278,27 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
>          * don't see ctx->dead set here, io_destroy() waits for our IO to
>          * finish.
>          */
> -       if (ctx->dead) {
> -               spin_unlock_irq(&ctx->ctx_lock);
> +       if (ctx->dead)
>                 ret = -EINVAL;
> +       spin_unlock_irq(&ctx->ctx_lock);
> +       if (ret)
>                 goto out_put_req;
> +
> +       if (unlikely(kiocbIsCancelled(req))) {
> +               ret = -EINTR;
> +       } else {
> +               ret = req->ki_retry(req);
>         }
> -       aio_run_iocb(req);
> -       if (!list_empty(&ctx->run_list)) {
> -               /* drain the run list */
> -               while (__aio_run_iocbs(ctx))
> -                       ;
> +       if (ret != -EIOCBQUEUED) {
> +               /*
> +                * There's no easy way to restart the syscall since other AIO's
> +                * may be already running. Just fail this IO with EINTR.
> +                */
> +               if (unlikely(ret == -ERESTARTSYS || ret == -ERESTARTNOINTR ||
> +                            ret == -ERESTARTNOHAND || ret == -ERESTART_RESTARTBLOCK))
> +                       ret = -EINTR;
> +               aio_complete(req, ret, 0);
>         }
> -       spin_unlock_irq(&ctx->ctx_lock);
>
>         aio_put_req(req);       /* drop extra ref to req */
>         return 0;

          return ret;          yes?
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