ChangeLog, Makefile.in, initialize.c, .del-io.h~72680822, openfs.c:
  Makefile.in (ELF_SO_VERSION): Bump version to be 2.4 since we've added
  	a new field to the io_channel (app_data).
  io.h: Add a new element to the io_channel structure, app_data.
  initialize.c, openfs.c: Set io->app_data to point at the filesystem handle.

diff --git a/lib/ext2fs/io.h b/lib/ext2fs/io.h
index f40d56e..d20ebf0 100644
--- a/lib/ext2fs/io.h
+++ b/lib/ext2fs/io.h
@@ -46,6 +46,7 @@
 	int		refcount;
 	int		reserved[15];
 	void		*private_data;
+	void		*app_data;
 };
 
 struct struct_io_manager {