OP_DEALLOCATE
return decode_op_hdr(xdr, OP_DEALLOCATE);
encode_op_hdr(xdr, OP_DEALLOCATE, decode_deallocate_maxsz, hdr);
[OP_DEALLOCATE] = {
[OP_DEALLOCATE] = nfsd4_decode_fallocate,
[OP_DEALLOCATE] = nfsd4_encode_noop,