--- include/parted/disk.h	(revision 106)
+++ include/parted/disk.h	(revision 106)
@@ -114,6 +114,8 @@ struct _PedDisk {
 	PedDevice*		dev;            /**< the device where the
                                                      partition table lies */
 	const PedDiskType*	type;           /**< type of disk label */
+        const int*          block_sizes; /**< block sizes supported
+                                              by this label */
 	PedPartition*		part_list; /**< list of partitions. Access with
                                                 ped_disk_next_partition() */
 
--- include/parted/filesys.h	(revision 106)
+++ include/parted/filesys.h	(revision 106)
@@ -52,6 +52,7 @@ struct _PedFileSystemOps {
 struct _PedFileSystemType {
 	PedFileSystemType*	next;
 	const char* const	name;
+        const int*              block_sizes;
 	PedFileSystemOps* const	ops;
 };