add partabandon
diff --git a/include/diskfs.h b/include/diskfs.h
index 50366ef..25bc931 100644
--- a/include/diskfs.h
+++ b/include/diskfs.h
@@ -69,6 +69,7 @@
 Disk*	diskopenventi(struct VtCache*, uchar*);
 Disk*	diskopenfile(char *file);
 Disk*	diskpart(Disk*, u64int offset, u64int count);
+void		diskpartabandon(Disk*);
 
 Disk*	diskopen(char *file);
 void		diskclose(Disk *disk);