linux-kernel - [PATCH 1/1] io_uring: place close flag changing code

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Message-Id: <aebc542fb8d3625178fa02c6a8c6a5b2b89466c4.1580518533.git.asml.silence@gmail.com>
Date:   Sat,  1 Feb 2020 03:58:42 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] io_uring: place close flag changing code

Both iocb_flags() and kiocb_set_rw_flags() are inline and modify
kiocb->ki_flags. Place them close, so they can be potentially better
optimised.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 73a6c6a4ec50..c3687bda92d0 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1865,8 +1865,11 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 		req->flags |= REQ_F_CUR_POS;
 		kiocb->ki_pos = req->file->f_pos;
 	}
-	kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
 	kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp));
+	kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
+	ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
+	if (unlikely(ret))
+		return ret;
 
 	ioprio = READ_ONCE(sqe->ioprio);
 	if (ioprio) {
@@ -1878,10 +1881,6 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 	} else
 		kiocb->ki_ioprio = get_current_ioprio();
 
-	ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
-	if (unlikely(ret))
-		return ret;
-
 	/* don't allow async punt if RWF_NOWAIT was requested */
 	if ((kiocb->ki_flags & IOCB_NOWAIT) ||
 	    (req->file->f_flags & O_NONBLOCK))
-- 
2.24.0