io_uring: move up io_put_kbuf() and io_put_rw_kbuf()

Move them up to avoid explicit declaration. We will use them in later
patches.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3631243d6fc4a79bbba0cd62597fc8cd5be95924.1638714983.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -1273,6 +1273,24 @@ static inline void io_req_set_rsrc_node(struct io_kiocb *req,
 	}
 }
 
+static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf)
+{
+	unsigned int cflags;
+
+	cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT;
+	cflags |= IORING_CQE_F_BUFFER;
+	req->flags &= ~REQ_F_BUFFER_SELECTED;
+	kfree(kbuf);
+	return cflags;
+}
+
+static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
+{
+	if (likely(!(req->flags & REQ_F_BUFFER_SELECTED)))
+		return 0;
+	return io_put_kbuf(req, req->kbuf);
+}
+
 static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl)
 {
 	bool got = percpu_ref_tryget(ref);
@@ -2456,24 +2474,6 @@ static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
 	return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
 }
 
-static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf)
-{
-	unsigned int cflags;
-
-	cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT;
-	cflags |= IORING_CQE_F_BUFFER;
-	req->flags &= ~REQ_F_BUFFER_SELECTED;
-	kfree(kbuf);
-	return cflags;
-}
-
-static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
-{
-	if (likely(!(req->flags & REQ_F_BUFFER_SELECTED)))
-		return 0;
-	return io_put_kbuf(req, req->kbuf);
-}
-
 static inline bool io_run_task_work(void)
 {
 	if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) {