int lqos_add_tgt(struct lu_qos *qos, struct lu_tgt_desc *ltd);
int lqos_del_tgt(struct lu_qos *qos, struct lu_tgt_desc *ltd);
u64 lu_prandom_u64_max(u64 ep_ro);
int lqos_add_tgt(struct lu_qos *qos, struct lu_tgt_desc *ltd);
int lqos_del_tgt(struct lu_qos *qos, struct lu_tgt_desc *ltd);
u64 lu_prandom_u64_max(u64 ep_ro);