linux-kernel - [PATCH v2 2/4] io_uring: do build_open

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Message-Id: <2f7d3bb00740c9fde183d72f5c0e196771df243a.1591190471.git.asml.silence@gmail.com>
Date:   Wed,  3 Jun 2020 16:29:30 +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 v2 2/4] io_uring: do build_open_how() only once

build_open_how() is just adjusting open_flags/mode. Do it once during
prep. It looks better than storing raw values for the future.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2463aaca3172..75ff635bb30e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2992,6 +2992,7 @@ static int io_fallocate(struct io_kiocb *req, bool force_nonblock)
 static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	const char __user *fname;
+	u64 flags, mode;
 	int ret;
 
 	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
@@ -3003,13 +3004,14 @@ static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (req->flags & REQ_F_NEED_CLEANUP)
 		return 0;
 
-	req->open.dfd = READ_ONCE(sqe->fd);
-	req->open.how.mode = READ_ONCE(sqe->len);
-	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	req->open.how.flags = READ_ONCE(sqe->open_flags);
+	mode = READ_ONCE(sqe->len);
+	flags = READ_ONCE(sqe->open_flags);
 	if (force_o_largefile())
-		req->open.how.flags |= O_LARGEFILE;
+		flags |= O_LARGEFILE;
+	req->open.how = build_open_how(flags, mode);
 
+	req->open.dfd = READ_ONCE(sqe->fd);
+	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
 	req->open.filename = getname(fname);
 	if (IS_ERR(req->open.filename)) {
 		ret = PTR_ERR(req->open.filename);
@@ -3103,7 +3105,6 @@ static int io_openat2(struct io_kiocb *req, bool force_nonblock)
 
 static int io_openat(struct io_kiocb *req, bool force_nonblock)
 {
-	req->open.how = build_open_how(req->open.how.flags, req->open.how.mode);
 	return io_openat2(req, force_nonblock);
 }
 
-- 
2.24.0