io_uring: inline linked part of io_req_find_next

Inline part of __io_req_find_next() that returns a request but doesn't
need io_disarm_next(). It's just two places, but makes links a bit
faster.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4126d13f23d0e91b39b3558e16bd86cafa7fcef2.1631115443.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -2074,17 +2074,8 @@ static bool io_disarm_next(struct io_kiocb *req)
 	return posted;
 }
 
-static struct io_kiocb *__io_req_find_next(struct io_kiocb *req)
+static void __io_req_find_next_prep(struct io_kiocb *req)
 {
-	struct io_kiocb *nxt;
-
-	/*
-	 * If LINK is set, we have dependent requests in this chain. If we
-	 * didn't fail this request, queue the first one up, moving any other
-	 * dependencies to the next request. In case of failure, fail the rest
-	 * of the chain.
-	 */
-	if (req->flags & IO_DISARM_MASK) {
 	struct io_ring_ctx *ctx = req->ctx;
 	bool posted;
 
@@ -2095,17 +2086,25 @@ static struct io_kiocb *__io_req_find_next(struct io_kiocb *req)
 	spin_unlock(&ctx->completion_lock);
 	if (posted)
 		io_cqring_ev_posted(ctx);
-	}
-	nxt = req->link;
-	req->link = NULL;
-	return nxt;
 }
 
 static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req)
 {
+	struct io_kiocb *nxt;
+
 	if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK))))
 		return NULL;
-	return __io_req_find_next(req);
+	/*
+	 * If LINK is set, we have dependent requests in this chain. If we
+	 * didn't fail this request, queue the first one up, moving any other
+	 * dependencies to the next request. In case of failure, fail the rest
+	 * of the chain.
+	 */
+	if (unlikely(req->flags & IO_DISARM_MASK))
+		__io_req_find_next_prep(req);
+	nxt = req->link;
+	req->link = NULL;
+	return nxt;
 }
 
 static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked)