SUNRPC: Move TCP receive state variables into private data structure

Move the TCP receive state variables from the generic rpc_xprt structure to
a private structure maintained inside net/sunrpc/xprtsock.c.

Also rename a function/variable pair to refer to RPC fragment headers
instead of record markers, to be consistent with types defined in
sunrpc/*.h.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/xprt.h

@@ -157,15 +157,6 @@ struct rpc_xprt {
 	unsigned char		shutdown   : 1,	/* being shut down */
 				resvport   : 1; /* use a reserved port */
 
-	/*
-	 * State of TCP reply receive stuff
-	 */
-	__be32			tcp_recm,	/* Fragment header */
-				tcp_xid;	/* Current XID */
-	u32			tcp_reclen,	/* fragment length */
-				tcp_offset;	/* fragment offset */
-	unsigned long		tcp_copied,	/* copied to request */
-				tcp_flags;
 	/*
 	 * Connection of transports
 	 */