OP_ACCESS
encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
status = decode_op_hdr(xdr, OP_ACCESS);
[OP_ACCESS] = {
[OP_ACCESS] = nfsd4_decode_access,
[OP_ACCESS] = nfsd4_encode_access,
#define FIRST_NFS4_OP OP_ACCESS