Most of the documentation is 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 development appears to have stalled and ReiserFS is deprecated and scheduled to be removed from mainline Linux in 2025.
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From Reiser4 FS Wiki
- (Note: this is not yet coded.) We will implement a plugin that notifies administrators by email when access is made to files, e.g. read access. ...Inheritance of attributes is the mechanism for implementing that. Security administrators should have the power to choose whatever units of security they desire with118 KB (20,187 words) - 21:59, 25 August 2016
- It is well known among system administrators that <tt>dump(8)</tt> is more complete than unix tar, and that there is qui32 KB (5,241 words) - 19:41, 25 December 2016