ext4: give i_aiodio_unwritten a more appropriate name

AIO/DIO prefix is wrong because it account unwritten extents which
also may be scheduled from buffered write endio

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e05267a..982f6fc 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -968,7 +968,7 @@
 	ei->i_sync_tid = 0;
 	ei->i_datasync_tid = 0;
 	atomic_set(&ei->i_ioend_count, 0);
-	atomic_set(&ei->i_aiodio_unwritten, 0);
+	atomic_set(&ei->i_unwritten, 0);
 
 	return &ei->vfs_inode;
 }