ovl_cleanup_and_whiteout
err = ovl_cleanup_and_whiteout(ofs, upperdir, upper);
int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct dentry *dir,
err = ovl_cleanup_and_whiteout(ofs, indexdir, index);
err = ovl_cleanup_and_whiteout(OVL_FS(dentry->d_sb),