nfs41: nfs41: pass *session in seq_args and seq_res

To be used for getting the rpc's minorversion and for nfs41 xdr
{en,de}coding of the sequence operation.
Reset the seq session ptrs for minorversion=0 rpc calls.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -291,6 +291,7 @@ int _nfs4_call_sync(struct nfs_server *server,
 		    struct nfs4_sequence_res *res,
 		    int cache_reply)
 {
+	args->sa_session = res->sr_session = NULL;
 	return rpc_call_sync(server->client, msg, 0);
 }
 

include/linux/nfs_xdr.h

@@ -162,11 +162,11 @@ struct nfs4_slot {
 };
 
 struct nfs4_sequence_args {
-	/* stub */
+	struct nfs4_session	*sa_session;
 };
 
 struct nfs4_sequence_res {
-	/* stub */
+	struct nfs4_session	*sr_session;
 };
 
 /*