include ext4

[Ben Collins]

On Sat, 2008-08-02 at 19:24 -0400, John Nelson wrote:
> I ask that the kernel devs include ext4 in intrepid. It is currently 
> unstable. But the on disk format will not change after 2.6.25 intrepid 
> uses 2.6.26. To use ext4 the USER HAS TO ADD TEST_FS to the ext3 
> superblock to mount it.

There's no good reason to enable ext4 except for the case where people
are working to debug/test/develop it. In such cases, you are likely
going to be rebuilding kernels/modules anyway.

If you really want it, grab the ext4 source and compile it against our
headers.