XFS and test12

[Russell Cattelan <cattelan@xxxxxxxxxxx>]

Short update:
Test12 has proven more difficult than expected.

I've working around the fact that ll_rw_block is redefining the b_end_io
callback.
I now have the file system reading AND writing data again.

The final problem appears to be a page unlocking problem.
the responsibility of unlocking pages has shifted a bit, and it appears
we are not doing it correctly.

Hopefully I will be able to track this down in the next day or so.


-Russell Cattelan