range_tree_min
return (range_tree_max(rt) - range_tree_min(rt));
uint64_t range_tree_min(range_tree_t *rt);
return (range_tree_min(vd->vdev_dtl[DTL_MISSING]) - 1);
} else if (rs_get_end(rs, rt) - range_tree_min(segs) >
uint64_t start = range_tree_min(segs);