13  *  1. Walk the descendants of a cgroup in pre-order.
14  *  2. Walk the descendants of a cgroup in post-order.
18  * For walking descendants, cgroup_iter can walk in either pre-order or
19  * post-order. For walking ancestors, the iter walks up from a cgroup to
40  * EOPNOTSUPP. In order to work around, the user may have to update their
54 	int order;  member
77 	if (p->order == BPF_CGROUP_ITER_DESCENDANTS_PRE)  in cgroup_iter_seq_start()
79 	else if (p->order == BPF_CGROUP_ITER_DESCENDANTS_POST)  in cgroup_iter_seq_start()
110 	if (p->order == BPF_CGROUP_ITER_DESCENDANTS_PRE)  in cgroup_iter_seq_next()
112 	else if (p->order == BPF_CGROUP_ITER_DESCENDANTS_POST)  in cgroup_iter_seq_next()
114 	else if (p->order == BPF_CGROUP_ITER_ANCESTORS_UP)  in cgroup_iter_seq_next()
170 	p->order = aux->cgroup.order;  in BTF_ID_LIST_SINGLE()
186 	int order = linfo->cgroup.order;  in bpf_iter_attach_cgroup()  local
189 	if (order != BPF_CGROUP_ITER_DESCENDANTS_PRE &&  in bpf_iter_attach_cgroup()
190 	    order != BPF_CGROUP_ITER_DESCENDANTS_POST &&  in bpf_iter_attach_cgroup()
191 	    order != BPF_CGROUP_ITER_ANCESTORS_UP &&  in bpf_iter_attach_cgroup()
192 	    order != BPF_CGROUP_ITER_SELF_ONLY)  in bpf_iter_attach_cgroup()
209 	aux->cgroup.order = order;  in bpf_iter_attach_cgroup()
240 	if (aux->cgroup.order == BPF_CGROUP_ITER_DESCENDANTS_PRE)  in bpf_iter_cgroup_show_fdinfo()
241 		seq_puts(seq, "order: descendants_pre\n");  in bpf_iter_cgroup_show_fdinfo()
242 	else if (aux->cgroup.order == BPF_CGROUP_ITER_DESCENDANTS_POST)  in bpf_iter_cgroup_show_fdinfo()
243 		seq_puts(seq, "order: descendants_post\n");  in bpf_iter_cgroup_show_fdinfo()
244 	else if (aux->cgroup.order == BPF_CGROUP_ITER_ANCESTORS_UP)  in bpf_iter_cgroup_show_fdinfo()
245 		seq_puts(seq, "order: ancestors_up\n");  in bpf_iter_cgroup_show_fdinfo()
247 		seq_puts(seq, "order: self_only\n");  in bpf_iter_cgroup_show_fdinfo()
253 	info->iter.cgroup.order = aux->cgroup.order;  in bpf_iter_cgroup_fill_link_info()