The fun thing is that right before this whole xattr thing hit LKML I actually approached Hans about implementing it as a reiser4 plugin since they already have all the intrastructure needed. Nate Diller promptly jumped on the task and we should hopefully see this implemented soon.
The Reiser4 developers are incredibly responsive to such requests as they serve a clear purpose of getting into the kernel and further into distributions. It's useless to them just to be in the kernel unless vendors also buy into adding support and that won't happen unless you can have SELinux, Beagle and all those nice features that require xattr.
I, for one, welcome Reiser4 on my system once I can install Fedora on it (and I started work on this support myself) just like I would ext3.
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