OP_LAYOUTCOMMIT
encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
[OP_LAYOUTCOMMIT] = {
[OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
[OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
[OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
[OP_LAYOUTCOMMIT] = nfsd4_encode_noop,