xfs_dir2_db_to_fdb
fdb = xfs_dir2_db_to_fdb(geo, db);
fbno = xfs_dir2_db_to_fdb(args->geo, *dbno);
xfs_dir2_db_to_fdb(args->geo, *dbno) !=
(long long)xfs_dir2_db_to_fdb(args->geo, *dbno),
newfdb = xfs_dir2_db_to_fdb(args->geo, newdb);