i've had ufs2 done (well, the kernel part) on my laptop for almost six months now :) most of it is in, although, as joachim pointed you to, some essential parts had to be backed out cause compatibility with old tools was broken, which is just not acceptable in openbsd.
and that was totally my fault. first, i naively thought compatibility could be reached between the three bsds super blocks. in addition, there was a bug in the tree for like two or three days i thought nobody would hit the window of (and so i fixed it without warning anyone). the result was that theo hit it, and that wasn't exactly what i would call a pleasant experience. some changes were then backed out, and until someone decides to join me on this effort, i've decided to temporarily stop hacking on it. (not to say that, to actually make use of all the room ufs2 gets us, we would need to bump daddr_t to 64 bits, and that is a whole new story...) -p.
