As Jeff Mahoney notes in this
message to the openSUSE factory list, the reiserfs filesystem has been
unmaintained for years and lacks many of the features that users have come
to expect. He has thus proposed removing reiserfs from openSUSE Tumbleweed
immediately.

I recognize that there may be people out there with disks
containing reiserfs file systems. If these are in active use, I
would seriously encourage migrating to something actively
maintained.

Source: LWN.net – OpenSUSE considers dropping reiserfs