dbuf_hash
uint64_t hv = dbuf_hash(os, obj, level, blkid);
uint64_t hv = dbuf_hash(os, obj, level, blkid);
uint64_t hv = dbuf_hash(db->db_objset, db->db.db_object,
return (dbuf_hash(db->db_objset, db->db.db_object,