v4.19.13 snapshot.
diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
new file mode 100644
index 0000000..119718a
--- /dev/null
+++ b/include/linux/sunrpc/svcsock.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/svcsock.h
+ *
+ * RPC server socket I/O.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef SUNRPC_SVCSOCK_H
+#define SUNRPC_SVCSOCK_H
+
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+/*
+ * RPC server socket.
+ */
+struct svc_sock {
+ struct svc_xprt sk_xprt;
+ struct socket * sk_sock; /* berkeley socket layer */
+ struct sock * sk_sk; /* INET layer */
+
+ /* We keep the old state_change and data_ready CB's here */
+ void (*sk_ostate)(struct sock *);
+ void (*sk_odata)(struct sock *);
+ void (*sk_owspace)(struct sock *);
+
+ /* private TCP part */
+ /* On-the-wire fragment header: */
+ __be32 sk_reclen;
+ /* As we receive a record, this includes the length received so
+ * far (including the fragment header): */
+ u32 sk_tcplen;
+ /* Total length of the data (not including fragment headers)
+ * received so far in the fragments making up this rpc: */
+ u32 sk_datalen;
+
+ struct page * sk_pages[RPCSVC_MAXPAGES]; /* received data */
+};
+
+static inline u32 svc_sock_reclen(struct svc_sock *svsk)
+{
+ return ntohl(svsk->sk_reclen) & RPC_FRAGMENT_SIZE_MASK;
+}
+
+static inline u32 svc_sock_final_rec(struct svc_sock *svsk)
+{
+ return ntohl(svsk->sk_reclen) & RPC_LAST_STREAM_FRAGMENT;
+}
+
+/*
+ * Function prototypes.
+ */
+void svc_close_net(struct svc_serv *, struct net *);
+int svc_recv(struct svc_rqst *, long);
+int svc_send(struct svc_rqst *);
+void svc_drop(struct svc_rqst *);
+void svc_sock_update_bufs(struct svc_serv *serv);
+bool svc_alien_sock(struct net *net, int fd);
+int svc_addsock(struct svc_serv *serv, const int fd,
+ char *name_return, const size_t len);
+void svc_init_xprt_sock(void);
+void svc_cleanup_xprt_sock(void);
+struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot);
+void svc_sock_destroy(struct svc_xprt *);
+
+/*
+ * svc_makesock socket characteristics
+ */
+#define SVC_SOCK_DEFAULTS (0U)
+#define SVC_SOCK_ANONYMOUS (1U << 0) /* don't register with pmap */
+#define SVC_SOCK_TEMPORARY (1U << 1) /* flag socket as temporary */
+
+#endif /* SUNRPC_SVCSOCK_H */