Mounting ext4-filesystem with newer Kernels

Trying to mount my ext4 partiton with a 2.6.25 kernel i get this errormessage:

EXT4-fs: hda3: not marked OK to use with test code.

There is a new special flag you have to set to mount development code, so do:

[root]# debugfs -w /dev/hda3
debugfs 1.40.9 (27-Apr-2008)
debugfs:  set_super_value s_flags 4
debugfs:  quit

More info, debugfs, ext4dev, here.