sunrpc: remove unused xpo_prep_reply_hdr callback

xpo_prep_reply_hdr are not used now.

It was defined for tcp transport only, however it cannot be
called indirectly, so let's move it to its caller and
remove unused callback.
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

include/linux/sunrpc/svc_rdma.h

@@ -193,7 +193,6 @@ extern int svc_rdma_sendto(struct svc_rqst *);
 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
 extern void svc_sq_reap(struct svcxprt_rdma *);
 extern void svc_rq_reap(struct svcxprt_rdma *);
-extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
 
 extern struct svc_xprt_class svc_rdma_class;
 #ifdef CONFIG_SUNRPC_BACKCHANNEL

include/linux/sunrpc/svc_xprt.h

@@ -20,7 +20,6 @@ struct svc_xprt_ops {
 	struct svc_xprt	*(*xpo_accept)(struct svc_xprt *);
 	int		(*xpo_has_wspace)(struct svc_xprt *);
 	int		(*xpo_recvfrom)(struct svc_rqst *);
-	void		(*xpo_prep_reply_hdr)(struct svc_rqst *);
 	int		(*xpo_sendto)(struct svc_rqst *);
 	void		(*xpo_release_rqst)(struct svc_rqst *);
 	void		(*xpo_detach)(struct svc_xprt *);

net/sunrpc/svc.c

@@ -1144,6 +1144,17 @@ void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
 static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
 #endif
 
+/*
+ * Setup response header for TCP, it has a 4B record length field.
+ */
+static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
+{
+	struct kvec *resv = &rqstp->rq_res.head[0];
+
+	/* tcp needs a space for the record length... */
+	svc_putnl(resv, 0);
+}
+
 /*
  * Common routine for processing the RPC request.
  */

net/sunrpc/svcsock.c

@@ -610,10 +610,6 @@ svc_udp_sendto(struct svc_rqst *rqstp)
 	return error;
 }
 
-static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
-{
-}
-
 static int svc_udp_has_wspace(struct svc_xprt *xprt)
 {
 	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
@@ -657,7 +653,6 @@ static const struct svc_xprt_ops svc_udp_ops = {
 	.xpo_release_rqst = svc_release_udp_skb,
 	.xpo_detach = svc_sock_detach,
 	.xpo_free = svc_sock_free,
-	.xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
 	.xpo_has_wspace = svc_udp_has_wspace,
 	.xpo_accept = svc_udp_accept,
 	.xpo_secure_port = svc_sock_secure_port,
@@ -1163,17 +1158,6 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp)
 	return sent;
 }
 
-/*
- * Setup response header. TCP has a 4B record length field.
- */
-void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
-{
-	struct kvec *resv = &rqstp->rq_res.head[0];
-
-	/* tcp needs a space for the record length... */
-	svc_putnl(resv, 0);
-}
-
 static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
 				       struct net *net,
 				       struct sockaddr *sa, int salen,
@@ -1189,7 +1173,6 @@ static const struct svc_xprt_ops svc_tcp_ops = {
 	.xpo_release_rqst = svc_release_skb,
 	.xpo_detach = svc_tcp_sock_detach,
 	.xpo_free = svc_sock_free,
-	.xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
 	.xpo_has_wspace = svc_tcp_has_wspace,
 	.xpo_accept = svc_tcp_accept,
 	.xpo_secure_port = svc_sock_secure_port,

net/sunrpc/xprtrdma/svc_rdma_sendto.c

@@ -714,10 +714,6 @@ static int svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
 	return 0;
 }
 
-void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
-{
-}
-
 /**
  * svc_rdma_sendto - Transmit an RPC reply
  * @rqstp: processed RPC request, reply XDR already in ::rq_res

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -85,7 +85,6 @@ static const struct svc_xprt_ops svc_rdma_ops = {
 	.xpo_release_rqst = svc_rdma_release_rqst,
 	.xpo_detach = svc_rdma_detach,
 	.xpo_free = svc_rdma_free,
-	.xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
 	.xpo_has_wspace = svc_rdma_has_wspace,
 	.xpo_accept = svc_rdma_accept,
 	.xpo_secure_port = svc_rdma_secure_port,