io_uring: add a helper failing not issued requests

Add a simple helper doing CQE posting, marking request for link-failure,
and putting both submission and completion references.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -1584,6 +1584,13 @@ static inline void io_req_complete(struct io_kiocb *req, long res)
 	__io_req_complete(req, 0, res, 0);
 }
 
+static void io_req_complete_failed(struct io_kiocb *req, long res)
+{
+	req_set_fail_links(req);
+	io_put_req(req);
+	io_req_complete_post(req, res, 0);
+}
+
 static bool io_flush_cached_reqs(struct io_ring_ctx *ctx)
 {
 	struct io_submit_state *state = &ctx->submit_state;
@@ -6346,9 +6353,7 @@ static void __io_queue_sqe(struct io_kiocb *req)
 			io_put_req(req);
 		}
 	} else {
-		req_set_fail_links(req);
-		io_put_req(req);
-		io_req_complete(req, ret);
+		io_req_complete_failed(req, ret);
 	}
 	if (linked_timeout)
 		io_queue_linked_timeout(linked_timeout);
@@ -6362,9 +6367,7 @@ static void io_queue_sqe(struct io_kiocb *req)
 	if (ret) {
 		if (ret != -EIOCBQUEUED) {
 fail_req:
-			req_set_fail_links(req);
-			io_put_req(req);
-			io_req_complete(req, ret);
+			io_req_complete_failed(req, ret);
 		}
 	} else if (req->flags & REQ_F_FORCE_ASYNC) {
 		ret = io_req_defer_prep(req);
@@ -6485,12 +6488,10 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
 		if (link->head) {
 			/* fail even hard links since we don't submit */
 			link->head->flags |= REQ_F_FAIL_LINK;
-			io_put_req(link->head);
-			io_req_complete(link->head, -ECANCELED);
+			io_req_complete_failed(link->head, -ECANCELED);
 			link->head = NULL;
 		}
-		io_put_req(req);
-		io_req_complete(req, ret);
+		io_req_complete_failed(req, ret);
 		return ret;
 	}
 	ret = io_req_prep(req, sqe);
@@ -8716,9 +8717,7 @@ static bool io_cancel_defer_files(struct io_ring_ctx *ctx,
 	while (!list_empty(&list)) {
 		de = list_first_entry(&list, struct io_defer_entry, list);
 		list_del_init(&de->list);
-		req_set_fail_links(de->req);
-		io_put_req(de->req);
-		io_req_complete(de->req, -ECANCELED);
+		io_req_complete_failed(de->req, -ECANCELED);
 		kfree(de);
 	}
 	return true;