Since it's reiserfs, you may be able to recover some of the files that were deleted, but this is a complex thing.
Depending on how critical the files are, determines what you do next. You can try to do the recovery live (if this is possible), or you can shut it down and perform it in another system, where your chances of success are higher. Trying to do it live may corrupt the system.
I haven't performed recovery on reiserfs myself, but recently spoke to someone who had; my understanding is that you can undelete every file that has been deleted (ever). He was able to get back the data he needed, and it was less time than rewriting weeks worth of code, but if this is a web server, this may not be a viable option.
Search for "reiserfs undelete" on Google or such, and refer to a forum where people specifically have a knowledge of Linux and filesystem recovery, especially reiser. If the data is really valuable, contact a data recovery firm, but this is likely to be up to $1000 USD, given the circumstances. (May be more if you need emergency turn-around, i.e. 24-48 hours)
This _is_ a very complex thing, and there is significant risk to losing the data, in trying to recover it. It must be worth many hours of your time, and potentially paying someone to assist, to get the files back. While I don't doubt that there's people here who could assist, I think it's better suited to a forum specific to Linux server administration, than webhosting, especially at this hour. Just my opinion, though.
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