diff -urN /md0/kernels/2.4/v2.4.10-pre2/include/linux/fs.h work-v2.4.10-pre2/include/linux/fs.h
--- /md0/kernels/2.4/v2.4.10-pre2/include/linux/fs.h	Wed Aug 29 18:28:50 2001
+++ work-v2.4.10-pre2/include/linux/fs.h	Wed Aug 29 20:14:58 2001
@@ -166,7 +166,7 @@
 #define BLKROSET   _IO(0x12,93)	/* set device read-only (0 = read-write) */
 #define BLKROGET   _IO(0x12,94)	/* get read-only status (0 = read_write) */
 #define BLKRRPART  _IO(0x12,95)	/* re-read partition table */
-#define BLKGETSIZE _IO(0x12,96)	/* return device size */
+#define BLKGETSIZE _IO(0x12,96)	/* return device size (long *arg) */
 #define BLKFLSBUF  _IO(0x12,97)	/* flush buffer cache */
 #define BLKRASET   _IO(0x12,98)	/* Set read ahead for block device */
 #define BLKRAGET   _IO(0x12,99)	/* get current read ahead setting */
@@ -182,6 +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
+/* _IO(0x12,108) and _IO(0x12,109) are reserved for binary compatibility */
+#define BLKGETSIZE64 _IO(0x12,110)	/* return device size (u64 *arg) */
 
 
 #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */