OVL_XATTR_OPAQUE
err = ovl_check_setxattr(ofs, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
return ovl_get_dir_xattr_val(ofs, path, OVL_XATTR_OPAQUE);
err = ovl_setxattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE, "0", 1);
ovl_removexattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE);
OVL_XATTR_TAB_ENTRY(OVL_XATTR_OPAQUE),