Index: uspace/lib/libc/include/ipc/bd.h
===================================================================
--- uspace/lib/libc/include/ipc/bd.h	(revision 40cb845e27b2621bd75305a3dd0b262cd21ab995)
+++ uspace/lib/libc/include/ipc/bd.h	(revision 08232eec7477aa13695d471714768b19b5d6d270)
@@ -40,4 +40,5 @@
 typedef enum {
 	BD_GET_BLOCK_SIZE = IPC_FIRST_USER_METHOD,
+	BD_GET_NUM_BLOCKS,
 	BD_READ_BLOCKS,
 	BD_WRITE_BLOCKS
Index: uspace/lib/libc/include/sys/types.h
===================================================================
--- uspace/lib/libc/include/sys/types.h	(revision 40cb845e27b2621bd75305a3dd0b262cd21ab995)
+++ uspace/lib/libc/include/sys/types.h	(revision 08232eec7477aa13695d471714768b19b5d6d270)
@@ -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;