The XFS(tm) Filesystem from Silicon Graphics, Inc.
The kernel module is a newer kernel module (version 0.4 versus version 0.1,
which was in contrib for SL 4 before)
We want to thank the CentOS Extras team, and Urs Beyerle.  Without their
efforts we wouldn't have been able to get this into the contrib area.

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Below is the warning for version 0.1.
version 0.4 does have patches to attempt to fix earlier problems,
but at the time of this writting, we have not done enough testing
to say that it is completely fixed, so we are leaving this 
warning as a reminder.
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These drivers are KNOWN to have PROBLEMS with 32bit RedHat kernels with 4k 
kernel stacks.

It is highly suggested that you NOT use these drivers but instead use the 64bit
version on a 64bit hardware.