From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>,
[email protected], Josh Triplett <[email protected]>
Cc: "David S . Miller" <[email protected]>,
Jakub Kicinski <[email protected]>,
[email protected], [email protected],
Stefan Metzmacher <[email protected]>
Subject: [PATCH v2 4/4] io_uring: accept directly into fixed file table
Date: Fri, 13 Aug 2021 17:43:13 +0100 [thread overview]
Message-ID: <eeeeea2beb47e0debfdf8a19fa1c7cdfef092fb6.1628871893.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
As done with open opcodes, allow accept to skip installing fd into
processes' file tables and put it directly into io_uring's fixed file
table. Same restrictions and design as for open.
Suggested-by: Josh Triplett <[email protected]>
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index f92adfbc9a6b..0e6189864d12 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4736,14 +4736,17 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
- if (sqe->ioprio || sqe->len || sqe->buf_index)
+ if (sqe->ioprio || sqe->len)
return -EINVAL;
accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
accept->flags = READ_ONCE(sqe->accept_flags);
accept->nofile = rlimit(RLIMIT_NOFILE);
+ req->buf_index = READ_ONCE(sqe->file_index);
+ if (req->buf_index && (accept->flags & SOCK_CLOEXEC))
+ return -EINVAL;
if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
return -EINVAL;
if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
@@ -4756,28 +4759,34 @@ static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
struct io_accept *accept = &req->accept;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
+ bool fixed = !!req->buf_index;
struct file *file;
int ret, fd;
if (req->file->f_flags & O_NONBLOCK)
req->flags |= REQ_F_NOWAIT;
- fd = __get_unused_fd_flags(accept->flags, accept->nofile);
- if (unlikely(fd < 0))
- return fd;
-
+ if (!fixed) {
+ fd = __get_unused_fd_flags(accept->flags, accept->nofile);
+ if (unlikely(fd < 0))
+ return fd;
+ }
file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
accept->flags);
if (IS_ERR(file)) {
+ if (!fixed)
+ put_unused_fd(fd);
ret = PTR_ERR(file);
if (ret == -EAGAIN && force_nonblock)
return -EAGAIN;
if (ret == -ERESTARTSYS)
ret = -EINTR;
req_set_fail(req);
- } else {
+ } else if (!fixed) {
fd_install(fd, file);
ret = fd;
+ } else {
+ ret = io_install_fixed_file(req, file, issue_flags);
}
__io_req_complete(req, issue_flags, ret, 0);
return 0;
--
2.32.0
next prev parent reply other threads:[~2021-08-13 16:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 16:43 [PATCH v2 0/4] open/accept directly into io_uring fixed file table Pavel Begunkov
2021-08-13 16:43 ` [PATCH v2 1/4] net: add accept helper not installing fd Pavel Begunkov
2021-08-13 16:43 ` [PATCH v2 2/4] io_uring: openat directly into fixed fd table Pavel Begunkov
2021-08-13 16:43 ` [PATCH v2 3/4] io_uring: hand code io_accept() fd installing Pavel Begunkov
2021-08-13 16:43 ` Pavel Begunkov [this message]
2021-08-13 19:00 ` [PATCH v2 0/4] open/accept directly into io_uring fixed file table Josh Triplett
2021-08-14 12:50 ` Pavel Begunkov
2021-08-14 23:03 ` Jens Axboe
2021-08-15 3:42 ` Josh Triplett
2021-08-15 15:05 ` Jens Axboe
2021-08-15 15:12 ` Jens Axboe
2021-08-15 13:00 ` Pavel Begunkov
2021-08-15 3:31 ` Josh Triplett
2021-08-15 10:48 ` Pavel Begunkov
2021-08-15 14:23 ` Pavel Begunkov
2021-08-16 15:45 ` Stefan Metzmacher
2021-08-17 9:33 ` Pavel Begunkov
2021-08-17 14:57 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=eeeeea2beb47e0debfdf8a19fa1c7cdfef092fb6.1628871893.git.asml.silence@gmail.com \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox