linux-kernel - [RFC 10/12] io_uring: opcode independent fixed buf import

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Message-Id: <560cd5b8469874d16405bf4621d4336fad991fbf.1638282789.git.asml.silence@gmail.com>
Date:   Tue, 30 Nov 2021 15:18:58 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     io-uring@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [RFC 10/12] io_uring: opcode independent fixed buf import

Extract an opcode independent helper from io_import_fixed for
initialising an iov_iter with a fixed buffer with

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 fs/io_uring.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e1360fde95d3..bb991f4cee7b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3152,11 +3152,11 @@ static void kiocb_done(struct io_kiocb *req, ssize_t ret,
 	}
 }
 
-static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter,
-			     struct io_mapped_ubuf *imu)
+static int __io_import_fixed(int rw, struct iov_iter *iter,
+			     struct io_mapped_ubuf *imu,
+			     u64 buf_addr, size_t len)
 {
-	size_t len = req->rw.len;
-	u64 buf_end, buf_addr = req->rw.addr;
+	u64 buf_end;
 	size_t offset;
 
 	if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end)))
@@ -3225,7 +3225,7 @@ static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter)
 		imu = READ_ONCE(ctx->user_bufs[index]);
 		req->imu = imu;
 	}
-	return __io_import_fixed(req, rw, iter, imu);
+	return __io_import_fixed(rw, iter, imu, req->rw.addr, req->rw.len);
 }
 
 static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock)
-- 
2.34.0