io_uring: Fix unused function warnings

to #28170604

commit 469956e853ccdba72bb82ad2eea6e8ab6b15791f upstream

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: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>

Minor tweaks.
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

@@ -3484,6 +3484,7 @@ 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)
 {
@@ -3501,7 +3502,6 @@ 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;
@@ -3527,14 +3527,10 @@ 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;
@@ -3588,14 +3584,10 @@ 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;
 
@@ -3638,9 +3630,6 @@ 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)
@@ -3753,7 +3742,6 @@ 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;
@@ -3778,14 +3766,10 @@ 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;
@@ -3846,14 +3830,10 @@ 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;
@@ -3910,15 +3890,10 @@ 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)))
@@ -3931,12 +3906,8 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	accept->flags = READ_ONCE(sqe->accept_flags);
 	accept->nofile = rlimit(RLIMIT_NOFILE);
 	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;
@@ -3967,11 +3938,9 @@ 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);
@@ -3980,14 +3949,10 @@ 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;
 
@@ -4004,14 +3969,10 @@ 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;
@@ -4049,10 +4010,59 @@ 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;