Re: [RFC 0/4] open/accept directly into io_uring fixed file table

From: Stefan Metzmacher
Date: Wed Jul 07 2021 - 09:59:32 EST

Am 07.07.21 um 15:07 schrieb Jens Axboe:
> 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.

I also requested it for open :-)