[Tux3] Introduce delalloc and volmap, and update for recent kernel

[OGAWA Hirofumi]

Hi,

This introduce simple dumb delalloc and volmap for atomic commit. And
update codes for recent kernel (2.6.29-rc2). So, to pull this, we may
want to setup recent kernel tree for tux3.

If this was pulled, the codes can't be built with older kernel. I'm
tested on some userland and kernel on 2.6.29-rc1. I'm not testing the
uml, and fuse at all.

    static-http://userweb.kernel.org/~hirofumi/tux3/

Well, anyway, first thing would be review. Please review it.
-- 
OGAWA Hirofumi <hirofumi at mail.parknet.co.jp>

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