Welcome to the Reiser4 Wiki, the Wiki for users and developers of the ReiserFS and Reiser4 filesystems.
For now, most of the documentation is just a snapshot of the old Namesys site (archive.org, 2007-09-29).
There was also a Reiser4 Wiki (archive.org, 2007-07-06) once on pub.namesys.com.
Reiser4 patchsets
From Reiser4 FS Wiki
As reiser4 is still not in mainline, Edward Shishkin is kind enough to provide patches:
http://www.kernel.org/pub/linux/kernel/people/edward/reiser4/reiser4-for-2.6/
After applying the patches, please test and report any issues!