blkg_to_pd
pd = blkg_to_pd(pos_blkg, &blkcg_policy_bfq);
return pd_to_bfqg(blkg_to_pd(blkg, &blkcg_policy_bfq));
struct blkg_policy_data *pd = blkg_to_pd(pos_blkg, pol);
pd = blkg_to_pd(blkg, pol);
return pd_to_iocg(blkg_to_pd(blkg, &blkcg_policy_iocost));
if (blkg->parent && blkg_to_pd(blkg->parent, &blkcg_policy_iolatency)) {
return pd_to_lat(blkg_to_pd(blkg, &blkcg_policy_iolatency));
return pd_to_tg(blkg_to_pd(blkg, &blkcg_policy_throtl));