linux-kernel - Re: [RFC 0/4] open/accept directly into io

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Message-ID: <81438f45-ac1d-4244-8d56-dbb44bb6d8b1@gmail.com>
Date:   Fri, 13 Aug 2021 17:30:19 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Josh Triplett <josh@...htriplett.org>, Jens Axboe <axboe@...nel.dk>
Cc:     io-uring@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC 0/4] open/accept directly into io_uring fixed file table

On 7/7/21 4:04 PM, Josh Triplett wrote:
> 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

Totally was thinking it was only a discussion but not an actual patch,
and I even did comment on it! Sorry Josh, would have persuaded you to
finish it, if I remembered that.

> https://lore.kernel.org/io-uring/20200715004209.GA334456@localhost/T/ in
> case that helps.
> 

-- 
Pavel Begunkov