Index: uspace/lib/libblock/libblock.h
===================================================================
--- uspace/lib/libblock/libblock.h	(revision 1e4cadad49fbe94a308f6f74c331537fbfc59425)
+++ uspace/lib/libblock/libblock.h	(revision 92454138de3db76b779e4a3ddf80182cb677196d)
@@ -60,6 +60,4 @@
 #define BLOCK_FLAGS_NOREAD	1
 
-typedef uint64_t bn_t;	/**< Block number type. */
-
 typedef struct block {
 	/** Mutex protecting the reference count. */
@@ -110,4 +108,5 @@
 
 extern int block_get_bsize(dev_handle_t, size_t *);
+extern int block_get_nblocks(dev_handle_t, bn_t *);
 extern int block_read_direct(dev_handle_t, bn_t, size_t, void *);
 extern int block_write_direct(dev_handle_t, bn_t, size_t, const void *);