io_uring: remove req->in_async

to #28170604

commit bcaec089c5b64953f96a59089598643911765a43 upstream

req->in_async is not really needed, it only prevents propagation of
@nxt for fast not-blocked submissions. Remove it.
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>

fs/io_uring.c

@@ -553,7 +553,6 @@ struct io_kiocb {
 	 * llist_node is only used for poll deferred completions
 	 */
 	struct llist_node		llist_node;
-	bool				in_async;
 	bool				needs_fixed_file;
 	u8				opcode;
 
@@ -1978,14 +1977,13 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret)
 	}
 }
 
-static void kiocb_done(struct kiocb *kiocb, ssize_t ret, struct io_kiocb **nxt,
-		       bool in_async)
+static void kiocb_done(struct kiocb *kiocb, ssize_t ret, struct io_kiocb **nxt)
 {
 	struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
 
 	if (req->flags & REQ_F_CUR_POS)
 		req->file->f_pos = kiocb->ki_pos;
-	if (in_async && ret >= 0 && kiocb->ki_complete == io_complete_rw)
+	if (ret >= 0 && kiocb->ki_complete == io_complete_rw)
 		*nxt = __io_complete_rw(kiocb, ret);
 	else
 		io_rw_done(kiocb, ret);
@@ -2276,7 +2274,7 @@ static int io_read(struct io_kiocb *req, struct io_kiocb **nxt,
 
 		/* Catch -EAGAIN return for forced non-blocking submission */
 		if (!force_nonblock || ret2 != -EAGAIN) {
-			kiocb_done(kiocb, ret2, nxt, req->in_async);
+			kiocb_done(kiocb, ret2, nxt);
 		} else {
 copy_iov:
 			ret = io_setup_async_rw(req, io_size, iovec,
@@ -2390,7 +2388,7 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
 		if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT))
 			ret2 = -EAGAIN;
 		if (!force_nonblock || ret2 != -EAGAIN) {
-			kiocb_done(kiocb, ret2, nxt, req->in_async);
+			kiocb_done(kiocb, ret2, nxt);
 		} else {
 copy_iov:
 			ret = io_setup_async_rw(req, io_size, iovec,
@@ -4547,7 +4545,6 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
 	}
 
 	if (!ret) {
-		req->in_async = true;
 		do {
 			ret = io_issue_sqe(req, NULL, &nxt, false);
 			/*
@@ -5094,7 +5091,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
 			*mm = ctx->sqo_mm;
 		}
 
-		req->in_async = async;
 		req->needs_fixed_file = async;
 		trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
 						true, async);