diff -urN v2.4.10-pre4/include/linux/fs.h work/include/linux/fs.h
--- v2.4.10-pre4/include/linux/fs.h	Mon Sep  3 11:04:39 2001
+++ work/include/linux/fs.h	Mon Sep  3 11:18:44 2001
@@ -182,7 +182,8 @@
 /* This was here just to show that the number is taken -
    probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
 #endif
-/* A jump here: 108-111 have been used for various private purposes. */
+/* A jump here: 108,109,111 have been used for various private purposes. */
+#define BLKBSZGET  _IOR(0x12,110,sizeof(u64))
 #define BLKBSZGET  _IOR(0x12,112,sizeof(int))
 #define BLKBSZSET  _IOW(0x12,113,sizeof(int))