OP_PUTROOTFH
encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
return decode_op_hdr(xdr, OP_PUTROOTFH);
[OP_PUTROOTFH] = {
[OP_PUTROOTFH] = nfsd4_decode_noop,
[OP_PUTROOTFH] = nfsd4_encode_noop,