From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>,
io-uring@vger.kernel.org, Josh Triplett <josh@joshtriplett.org>
Cc: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Stefan Metzmacher <metze@samba.org>
Subject: [PATCH v4 0/4] open/accept directly into io_uring fixed file table
Date: Wed, 25 Aug 2021 12:25:43 +0100 [thread overview]
Message-ID: <cover.1629888991.git.asml.silence@gmail.com> (raw)
Add an optional feature to open/accept directly into io_uring's fixed
file table bypassing the normal file table. Same behaviour if as the
snippet below, but in one operation:
sqe = io_uring_[open|accept]_prep();
io_uring_submit(sqe);
// ... once we get a CQE back
io_uring_register_files_update(uring_idx, (fd = cqe->res));
close((fd = cqe->res));
The idea is old, and was brough up and implemented a year ago by
Josh Triplett, though haven't sought the light.
The behaviour is controlled by setting sqe->file_index, where 0 implies
the old behaviour using normal file tables. If non-zero value is
specified, then it will behave as described and place the file into a
fixed file slot sqe->file_index - 1. A file table should be already
created, the slot should be valid and empty, otherwise the operation
will fail.
note: IOSQE_FIXED_FILE can't be used as a mode switch, because accept
takes a file, and it already uses the flag with a different meaning.
v2, since RFC:
- added attribution
- updated descriptions
- rebased
v3:
- EBADF if slot is already used (Josh Triplett)
- alias index with splice_fd_in (Josh Triplett)
- fix a bound check bug
v4:
- separate u32 fields to internally store indexes (Jens, Josh)
Pavel Begunkov (4):
net: add accept helper not installing fd
io_uring: openat directly into fixed fd table
io_uring: hand code io_accept() fd installing
io_uring: accept directly into fixed file table
fs/io_uring.c | 115 +++++++++++++++++++++++++++++-----
include/linux/socket.h | 3 +
include/uapi/linux/io_uring.h | 5 +-
net/socket.c | 71 +++++++++++----------
4 files changed, 143 insertions(+), 51 deletions(-)
--
2.32.0
next reply other threads:[~2021-08-25 11:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-25 11:25 Pavel Begunkov [this message]
2021-08-25 11:25 ` [PATCH v4 1/4] net: add accept helper not installing fd Pavel Begunkov
2021-08-25 12:32 ` David Miller
2021-08-25 11:25 ` [PATCH v4 2/4] io_uring: openat directly into fixed fd table Pavel Begunkov
2021-08-25 11:25 ` [PATCH v4 3/4] io_uring: hand code io_accept() fd installing Pavel Begunkov
2021-08-25 11:25 ` [PATCH v4 4/4] io_uring: accept directly into fixed file table Pavel Begunkov
2021-08-25 15:00 ` [PATCH v4 0/4] open/accept directly into io_uring " Jens Axboe
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