XFS+chattr=no joy

[Austin Gonyou <austin@xxxxxxxxxxxxxxx>]

I get the following message when I try to chattr +i a file, anywhere, as
any user:

-----------Snip----------
[austin@UberGeek austin]$ touch test
[austin@UberGeek austin]$ chattr +ia test
chattr: Invalid argument while reading flags on test
-----------Snip----------
Any idea why that is?
-- 
Austin Gonyou
Systems Architect, CCNA
Coremetrics, Inc.
Phone: 512-796-9023
email: austin@xxxxxxxxxxxxxxx