ovl_get_dir_xattr_val
char ovl_get_dir_xattr_val(struct ovl_fs *ofs, const struct path *path,
return ovl_get_dir_xattr_val(ofs, &upperpath, OVL_XATTR_IMPURE) == 'y';
return ovl_get_dir_xattr_val(ofs, path, OVL_XATTR_OPAQUE);