NFS4_DUP_FREE
if (new_state != NFS4_DUP_FREE)
case NFS4_DUP_FREE:
rfs4_dr_chstate(drp_tail, NFS4_DUP_FREE);
drp->dr_state = NFS4_DUP_FREE;
rfs4_dr_chstate(drp, NFS4_DUP_FREE);