__aafs_ns_mkdir
error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
error = __aafs_ns_mkdir(ns, ns_subns_dir(parent), name, dir);