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Date: Wed, 7 Jul 2021 08:04:24 -0700
From: Josh Triplett <josh@joshtriplett.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>, io-uring@vger.kernel.org,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [RFC 0/4] open/accept directly into io_uring fixed file table
Message-ID: <YOXCeNs0waut1Jh1@localhost>
References: <cover.1625657451.git.asml.silence@gmail.com>
<48bd91bc-ba1a-1e69-03a1-3d6f913f96c3@kernel.dk>
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On Wed, Jul 07, 2021 at 07:07:52AM -0600, Jens Axboe wrote:
> On 7/7/21 5:39 AM, Pavel Begunkov wrote:
> > Implement an old idea allowing open/accept io_uring requests to register
> > a newly created file as a io_uring's fixed file instead of placing it
> > into a task's file table. The switching is encoded in io_uring's SQEs
> > by setting sqe->buf_index/file_index, so restricted to 2^16-1. Don't
> > think we need more, but may be a good idea to scrap u32 somewhere
> > instead.
> >
> > From the net side only needs a function doing __sys_accept4_file()
> > but not installing fd, see 2/4.
> >
> > Only RFC for now, the new functionality is tested only for open yet.
> > I hope we can remember the author of the idea to add attribution.
>
> Pretty sure the original suggester of this as Josh, CC'ed.
Thanks for working on this, Pavel!
Original thread at
https://lore.kernel.org/io-uring/20200715004209.GA334456@localhost/T/ in
case that helps.