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From: Pavel Begunkov <>
To: Jens Axboe <>,
Subject: Re: [PATCH liburing] man/io_uring_enter.2: add notes about direct open/accept
Date: Tue, 31 Aug 2021 21:07:41 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 8/31/21 9:04 PM, Jens Axboe wrote:
> On 8/31/21 1:52 PM, Pavel Begunkov wrote:
>> Add a few lines describing openat/openat2/accept bypassing normal file
>> tables and installing files right into the fixed file table.
>> Signed-off-by: Pavel Begunkov <>
>> ---
>>  man/io_uring_enter.2 | 36 ++++++++++++++++++++++++++++++++++++
>>  1 file changed, 36 insertions(+)
>> diff --git a/man/io_uring_enter.2 b/man/io_uring_enter.2
>> index 9ccedef..52a5e13 100644
>> --- a/man/io_uring_enter.2
>> +++ b/man/io_uring_enter.2
>> @@ -511,6 +511,18 @@ field. See also
>>  .BR accept4(2)
>>  for the general description of the related system call. Available since 5.5.
>> +If the
>> +.I file_index
>> +field is set to a non-negative number, the file won't be installed into the
>> +normal file table as usual but will be placed into the fixed file table at index
>> +.I file_index - 1.
>> +In this case, instead of returning a file descriptor, the result will contain
>> +0 on success or an error. If there is already a file registered at this index,
> I don't think non-negative is correct, it has to be set to a positive
> number. non-negative would include 0, which isn't correct.

Oh, right, should have been non-zero

> Should also include a note on if these types of file are used, they
> won't work in anything but io_uring. That's obvious to us, but should be
> noted that they then only live within the realm of the ring itself, not
> the system as a whole.

Will send a v2

Pavel Begunkov

      reply	other threads:[~2021-08-31 20:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31 19:52 [PATCH liburing] man/io_uring_enter.2: add notes about direct open/accept Pavel Begunkov
2021-08-31 20:04 ` Jens Axboe
2021-08-31 20:07   ` Pavel Begunkov [this message]

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