-void filesys_init (bool reformat);
-bool filesys_create (const char *name);
-struct file *filesys_open (const char *name);
+#ifndef OFF_T
+#define OFF_T
+typedef int32_t off_t;
+#endif
+
+struct file;
+void filesys_init (bool format);
+bool filesys_create (const char *name, off_t initial_size);