ovl_check_origin_fh
err = ovl_check_origin_fh(ofs, fh, false, NULL, &stack);
err = ovl_check_origin_fh(ofs, fh, true, NULL, &stack);
err = ovl_check_origin_fh(ofs, fh, false, upperdentry, stackp);
err = ovl_check_origin_fh(ofs, fh, false, index, &stack);
int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,