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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 v4 3/4] io_uring: hand code io_accept() fd installing
Date: Wed, 25 Aug 2021 12:25:46 +0100	[thread overview]
Message-ID: <5b73d204caa0ce979ccb98136695b60f52a3d98c.1629888991.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

Make io_accept() to handle file descriptor allocations and installation.
A preparation patch for bypassing file tables.

Signed-off-by: Pavel Begunkov <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
---
 fs/io_uring.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2ef81cd6a0ec..a3b1a50e2537 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4809,6 +4809,11 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
 	accept->flags = READ_ONCE(sqe->accept_flags);
 	accept->nofile = rlimit(RLIMIT_NOFILE);
+
+	if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
+		return -EINVAL;
+	if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
+		accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
 	return 0;
 }
 
@@ -4817,20 +4822,28 @@ 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;
-	int ret;
+	struct file *file;
+	int ret, fd;
 
 	if (req->file->f_flags & O_NONBLOCK)
 		req->flags |= REQ_F_NOWAIT;
 
-	ret = __sys_accept4_file(req->file, file_flags, accept->addr,
-					accept->addr_len, accept->flags,
-					accept->nofile);
-	if (ret == -EAGAIN && force_nonblock)
-		return -EAGAIN;
-	if (ret < 0) {
+	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)) {
+		ret = PTR_ERR(file);
+		if (ret == -EAGAIN && force_nonblock)
+			return -EAGAIN;
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
 		req_set_fail(req);
+	} else {
+		fd_install(fd, file);
+		ret = fd;
 	}
 	__io_req_complete(req, issue_flags, ret, 0);
 	return 0;
-- 
2.32.0


  parent 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 [PATCH v4 0/4] open/accept directly into io_uring fixed file table Pavel Begunkov
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 ` Pavel Begunkov [this message]
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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