Index: uspace/lib/libc/include/sys/types.h
===================================================================
--- uspace/lib/libc/include/sys/types.h	(revision 1313ee92979dd133fd0dd0717213410aada3df10)
+++ uspace/lib/libc/include/sys/types.h	(revision 0ff9e67f7c2c8fa8131d075d54fd17e3dc98f207)
@@ -40,4 +40,5 @@
 typedef long off_t;
 typedef int mode_t;
+typedef uint64_t bn_t;	/**< Block number type. */
 
 typedef int32_t wchar_t;