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From: William Dauchy <wdauchy@gmail.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: io-uring@vger.kernel.org
Subject: Re: SQPOLL behaviour with openat
Date: Sat, 4 Jan 2020 17:41:50 +0100	[thread overview]
Message-ID: <CAJ75kXZdwF4x0Od9BE5OD0vxbkuKR2UDHSfjaQ-yhjUkpx=r2A@mail.gmail.com> (raw)
In-Reply-To: <fad9c723-88ed-355f-6938-71db6db948b4@kernel.dk>

Hello Jens,

Thank you for the quick answer.

On Sat, Jan 4, 2020 at 5:28 PM Jens Axboe <axboe@kernel.dk> wrote:
> sqpoll requires the use of fixed files for any sqe, at least for now.
> That's why it returns -EBADF if the request doesn't have fixed files
> specified.

 I indeed forgot sqe->flags |= IOSQE_FIXED_FILE; in my modified test.

> So it cannot be used with opcodes that create (or close) file
> descriptors either.

ok, I thought `dirfd` could have been the index of my registered fd
for `openat` call. It was not very clear to me this was not possible
to use fixed files for those opcodes.

Thanks,
-- 
William

  reply	other threads:[~2020-01-04 16:42 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-04 16:22 SQPOLL behaviour with openat wdauchy
2020-01-04 16:28 ` Jens Axboe
2020-01-04 16:41   ` William Dauchy [this message]
2020-01-04 17:41     ` Jens Axboe

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