io_uring: Fix unused function warnings

If CONFIG_NET is not set, gcc warns:

fs/io_uring.c:3110:12: warning: io_setup_async_msg defined but not used [-Wunused-function]
 static int io_setup_async_msg(struct io_kiocb *req,
            ^~~~~~~~~~~~~~~~~~

There are many funcions wraped by CONFIG_NET, move them
together to simplify code, also fix this warning.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>

Minor tweaks.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -3477,6 +3477,7 @@ static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock)
 	return 0;
 }
 
+#if defined(CONFIG_NET)
 static int io_setup_async_msg(struct io_kiocb *req,
 			      struct io_async_msghdr *kmsg)
 {
@@ -3494,7 +3495,6 @@ static int io_setup_async_msg(struct io_kiocb *req,
 
 static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
-#if defined(CONFIG_NET)
 	struct io_sr_msg *sr = &req->sr_msg;
 	struct io_async_ctx *io = req->io;
 	int ret;
@@ -3520,14 +3520,10 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (!ret)
 		req->flags |= REQ_F_NEED_CLEANUP;
 	return ret;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int io_sendmsg(struct io_kiocb *req, bool force_nonblock)
 {
-#if defined(CONFIG_NET)
 	struct io_async_msghdr *kmsg = NULL;
 	struct socket *sock;
 	int ret;
@@ -3581,14 +3577,10 @@ static int io_sendmsg(struct io_kiocb *req, bool force_nonblock)
 		req_set_fail_links(req);
 	io_put_req(req);
 	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int io_send(struct io_kiocb *req, bool force_nonblock)
 {
-#if defined(CONFIG_NET)
 	struct socket *sock;
 	int ret;
 
@@ -3631,9 +3623,6 @@ static int io_send(struct io_kiocb *req, bool force_nonblock)
 		req_set_fail_links(req);
 	io_put_req(req);
 	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io)
@@ -3746,7 +3735,6 @@ static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req,
 static int io_recvmsg_prep(struct io_kiocb *req,
 			   const struct io_uring_sqe *sqe)
 {
-#if defined(CONFIG_NET)
 	struct io_sr_msg *sr = &req->sr_msg;
 	struct io_async_ctx *io = req->io;
 	int ret;
@@ -3771,14 +3759,10 @@ static int io_recvmsg_prep(struct io_kiocb *req,
 	if (!ret)
 		req->flags |= REQ_F_NEED_CLEANUP;
 	return ret;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int io_recvmsg(struct io_kiocb *req, bool force_nonblock)
 {
-#if defined(CONFIG_NET)
 	struct io_async_msghdr *kmsg = NULL;
 	struct socket *sock;
 	int ret, cflags = 0;
@@ -3839,14 +3823,10 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock)
 		req_set_fail_links(req);
 	io_put_req(req);
 	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int io_recv(struct io_kiocb *req, bool force_nonblock)
 {
-#if defined(CONFIG_NET)
 	struct io_buffer *kbuf = NULL;
 	struct socket *sock;
 	int ret, cflags = 0;
@@ -3903,15 +3883,10 @@ static int io_recv(struct io_kiocb *req, bool force_nonblock)
 		req_set_fail_links(req);
 	io_put_req(req);
 	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
-
 static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
-#if defined(CONFIG_NET)
 	struct io_accept *accept = &req->accept;
 
 	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
@@ -3923,12 +3898,8 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
 	accept->flags = READ_ONCE(sqe->accept_flags);
 	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
-#if defined(CONFIG_NET)
 static int __io_accept(struct io_kiocb *req, bool force_nonblock)
 {
 	struct io_accept *accept = &req->accept;
@@ -3958,11 +3929,9 @@ static void io_accept_finish(struct io_wq_work **workptr)
 	__io_accept(req, false);
 	io_steal_work(req, workptr);
 }
-#endif
 
 static int io_accept(struct io_kiocb *req, bool force_nonblock)
 {
-#if defined(CONFIG_NET)
 	int ret;
 
 	ret = __io_accept(req, force_nonblock);
@@ -3971,14 +3940,10 @@ static int io_accept(struct io_kiocb *req, bool force_nonblock)
 		return -EAGAIN;
 	}
 	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
-#if defined(CONFIG_NET)
 	struct io_connect *conn = &req->connect;
 	struct io_async_ctx *io = req->io;
 
@@ -3995,14 +3960,10 @@ static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
 	return move_addr_to_kernel(conn->addr, conn->addr_len,
 					&io->connect.address);
-#else
-	return -EOPNOTSUPP;
-#endif
 }
 
 static int io_connect(struct io_kiocb *req, bool force_nonblock)
 {
-#if defined(CONFIG_NET)
 	struct io_async_ctx __io, *io;
 	unsigned file_flags;
 	int ret;
@@ -4040,10 +4001,59 @@ static int io_connect(struct io_kiocb *req, bool force_nonblock)
 	io_cqring_add_event(req, ret);
 	io_put_req(req);
 	return 0;
-#else
+}
+#else /* !CONFIG_NET */
+static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_sendmsg(struct io_kiocb *req, bool force_nonblock)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_send(struct io_kiocb *req, bool force_nonblock)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_recvmsg_prep(struct io_kiocb *req,
+			   const struct io_uring_sqe *sqe)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_recvmsg(struct io_kiocb *req, bool force_nonblock)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_recv(struct io_kiocb *req, bool force_nonblock)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_accept(struct io_kiocb *req, bool force_nonblock)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+	return -EOPNOTSUPP;
+}
+
+static int io_connect(struct io_kiocb *req, bool force_nonblock)
+{
 	return -EOPNOTSUPP;
-#endif
 }
+#endif /* CONFIG_NET */
 
 struct io_poll_table {
 	struct poll_table_struct pt;