130 	s->count = 0;  in init_ro_spine()
139 	for (i = 0; i < s->count; i++) {  in exit_ro_spine()
152 	if (s->count == 2) {  in ro_step()
157 		s->count--;  in ro_step()
160 	r = bn_read_lock(s->info, new_child, s->nodes + s->count);  in ro_step()
162 		s->count++;  in ro_step()
169 	BUG_ON(!s->count);  in ro_pop()
170 	--s->count;  in ro_pop()
171 	unlock_block(s->info, s->nodes[s->count]);  in ro_pop()
178 	BUG_ON(!s->count);  in ro_node()
179 	block = s->nodes[s->count - 1];  in ro_node()
189 	s->count = 0;  in init_shadow_spine()
196 	for (i = 0; i < s->count; i++) {  in exit_shadow_spine()
210 	if (s->count == 2) {  in shadow_step()
215 		s->count--;  in shadow_step()
218 	r = bn_shadow(s->info, b, vt, s->nodes + s->count);  in shadow_step()
220 		if (!s->count)  in shadow_step()
223 		s->count++;  in shadow_step()
231 	BUG_ON(!s->count);  in shadow_current()
233 	return s->nodes[s->count - 1];  in shadow_current()
238 	BUG_ON(s->count != 2);  in shadow_parent()
240 	return s->count == 2 ? s->nodes[0] : NULL;  in shadow_parent()
245 	return s->count >= 2;  in shadow_has_parent()