SUNRPC: Clean up static inline functions in svc_xprt.h

Clean up:  Enable the use of const arguments in higher level svc_ APIs
by adding const to the arguments of the helper functions in svc_xprt.h

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

include/linux/sunrpc/svc_xprt.h

@@ -88,29 +88,32 @@ static inline void svc_xprt_get(struct svc_xprt *xprt)
 	kref_get(&xprt->xpt_ref);
 }
 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
-				      struct sockaddr *sa, int salen)
+				      const struct sockaddr *sa,
+				      const size_t salen)
 {
 	memcpy(&xprt->xpt_local, sa, salen);
 	xprt->xpt_locallen = salen;
 }
 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
-				       struct sockaddr *sa, int salen)
+				       const struct sockaddr *sa,
+				       const size_t salen)
 {
 	memcpy(&xprt->xpt_remote, sa, salen);
 	xprt->xpt_remotelen = salen;
 }
-static inline unsigned short svc_addr_port(struct sockaddr *sa)
+static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 {
-	unsigned short ret = 0;
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
+
 	switch (sa->sa_family) {
 	case AF_INET:
-		ret = ntohs(((struct sockaddr_in *)sa)->sin_port);
-		break;
+		return ntohs(sin->sin_port);
 	case AF_INET6:
-		ret = ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
-		break;
+		return ntohs(sin6->sin6_port);
 	}
-	return ret;
+
+	return 0;
 }
 
 static inline size_t svc_addr_len(struct sockaddr *sa)
@@ -124,36 +127,39 @@ static inline size_t svc_addr_len(struct sockaddr *sa)
 	return -EAFNOSUPPORT;
 }
 
-static inline unsigned short svc_xprt_local_port(struct svc_xprt *xprt)
+static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 {
-	return svc_addr_port((struct sockaddr *)&xprt->xpt_local);
+	return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 }
 
-static inline unsigned short svc_xprt_remote_port(struct svc_xprt *xprt)
+static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 {
-	return svc_addr_port((struct sockaddr *)&xprt->xpt_remote);
+	return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 }
 
-static inline char *__svc_print_addr(struct sockaddr *addr,
-				     char *buf, size_t len)
+static inline char *__svc_print_addr(const struct sockaddr *addr,
+				     char *buf, const size_t len)
 {
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
+
 	switch (addr->sa_family) {
 	case AF_INET:
-		snprintf(buf, len, "%pI4, port=%u",
-			&((struct sockaddr_in *)addr)->sin_addr,
-			ntohs(((struct sockaddr_in *) addr)->sin_port));
+		snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
+			ntohs(sin->sin_port));
 		break;
 
 	case AF_INET6:
 		snprintf(buf, len, "%pI6, port=%u",
-			 &((struct sockaddr_in6 *)addr)->sin6_addr,
-			ntohs(((struct sockaddr_in6 *) addr)->sin6_port));
+			 &sin6->sin6_addr,
+			ntohs(sin6->sin6_port));
 		break;
 
 	default:
 		snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 		break;
 	}
+
 	return buf;
 }
 #endif /* SUNRPC_SVC_XPRT_H */