configfs_is_root
extern int configfs_is_root(struct config_item *item);
if (configfs_is_root(target))
if (configfs_is_root(&parent->cg_item)) {
for (root = parent; !configfs_is_root(&root->cg_item);
else if (configfs_is_root(&parent_group->cg_item))
do { depth++; } while ((p = p->ci_parent) && !configfs_is_root(p));
} while (p && !configfs_is_root(p));
for (p = item; p && !configfs_is_root(p); p = p->ci_parent) {