Buffered write deadlock fix and new aops for 2.6.21-mm2

-- 
Here is an update against 2.6.21-mm2. Unfortunately UML broke for me, so
test coverage isn't so good as the last time I posted the series. Also,
several filesystems had significant clashes. Considering the amount of
time it took to get them working, I won't fix them again. They aren't
_broken_ as such, they'll just run slowly (but without the deadlock).

The OCFS2 patch seemed to have some clashes too, so I've left that out.
I'm sure Mark will take a look at that quickly if this patchset were to
get merged.

Thanks to Neil for some documentation suggestions and catching a bug, and
to Vladimir for the reiserfs implementation (not 100% done yet, but it is
a good start).



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