btrfs on Big Endian systems - anyone?

[Andrei Borzenkov]

I am not able to access btrfs on PowerPC. I did not test all of them,
but other filesystems I tried are OK. Looking at platforms, PPC seems
to be the only BE platform widely used for Linux; there are SPARC and
MIPS but I doubt they use btrfs often.

It sounds like missing endian conversion somewhere; any idea how it can
be found without learning btrfs by heart? :)