linux-kernel - Re: [PATCH] io_uring: remove io_remove

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Message-ID: <CABWKuGXfBxeQv7HpVz9J97x0deoSNxUaVRxCToX0C_FTSs=1QQ@mail.gmail.com>
Date:   Thu, 24 Dec 2020 09:38:26 +0800
From:   Yejune Deng <yejune.deng@...il.com>
To:     Pavel Begunkov <asml.silence@...il.com>, sgarzare@...hat.com
Cc:     viro@...iv.linux.org.uk, axboe@...nel.dk,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] io_uring: remove io_remove_personalities()

OK，I will adopt it and resubmit.

On Wed, Dec 23, 2020 at 8:45 PM Pavel Begunkov <asml.silence@...il.com> wrote:
>
> On 23/12/2020 10:36, Stefano Garzarella wrote:
> > On Wed, Dec 23, 2020 at 11:27:05AM +0800, Yejune Deng wrote:
> >> The function io_remove_personalities() is very similar to
> >> io_unregister_personality(),but the latter has a more reasonable
> >> return value.
> >>
> >> Signed-off-by: Yejune Deng <yejune.deng@...il.com>
> >> ---
> >> fs/io_uring.c | 25 ++++++-------------------
> >> 1 file changed, 6 insertions(+), 19 deletions(-)
> >
> > The patch LGTM, maybe as an alternative you can leave io_remove_personality() with the interface needed by idr_for_each() and implement io_unregister_personality() calling io_remove_personality() with the right parameters.
>
> Right, don't replace sane types with void * just because.
> Leave well-typed io_unregister_personality() and call it from
> io_remove_personalities().
>
>
> Also
>  * idr_for_each() - Iterate through all stored pointers.
>  ...
>  * If @fn returns anything other than %0, the iteration stops and that
>  * value is returned from this function.
>
> For io_remove_personality() iod==NULL should not happen because
> it's under for_each and synchronised, but leave the return value be
>
> io_remove_personality(void *, ...)
> {
>         struct io_ring_ctx *ctx = data;
>
>         io_unregister_personality(ctx, id);
>         return 0;
> }
>
> --
> Pavel Begunkov