SUNRPC: New xdr_streams XDR decoder API

Now that all client-side XDR decoder routines use xdr_streams, there
should be no need to support the legacy calling sequence [rpc_rqst *,
__be32 *, RPC res *] anywhere.  We can construct an xdr_stream in the
generic RPC code, instead of in each decoder function.

This is a refactoring change.  It should not cause different behavior.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index d88cffb..8521067 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -112,7 +112,7 @@
 	__be32 *		(*crvalidate)(struct rpc_task *, __be32 *);
 	int			(*crwrap_req)(struct rpc_task *, kxdreproc_t,
 						void *, __be32 *, void *);
-	int			(*crunwrap_resp)(struct rpc_task *, kxdrproc_t,
+	int			(*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
 						void *, __be32 *, void *);
 };
 
@@ -140,7 +140,7 @@
 __be32 *		rpcauth_marshcred(struct rpc_task *, __be32 *);
 __be32 *		rpcauth_checkverf(struct rpc_task *, __be32 *);
 int			rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj);
-int			rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp, __be32 *data, void *obj);
+int			rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj);
 int			rpcauth_refreshcred(struct rpc_task *);
 void			rpcauth_invalcred(struct rpc_task *);
 int			rpcauth_uptodatecred(struct rpc_task *);
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 7b19c4e..ef9476a 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -90,7 +90,7 @@
 struct rpc_procinfo {
 	u32			p_proc;		/* RPC procedure number */
 	kxdreproc_t		p_encode;	/* XDR encode function */
-	kxdrproc_t		p_decode;	/* XDR decode function */
+	kxdrdproc_t		p_decode;	/* XDR decode function */
 	unsigned int		p_arglen;	/* argument hdr length (u32) */
 	unsigned int		p_replen;	/* reply hdr length (u32) */
 	unsigned int		p_count;	/* call count */
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index a21cf53..9a21e81 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -204,9 +204,10 @@
 };
 
 /*
- * This is the xdr_stream style generic XDR function.
+ * These are the xdr_stream style generic XDR encode and decode functions.
  */
 typedef void	(*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
+typedef int	(*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
 
 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);