O(1) page launder, first version

[Rik van Riel <riel@conectiva.com.br>]

Hi,

I've made available the first (still crashing) version of
the O(1) page launder code Arjan designed.

You can grab it from bk://linuxvm.bkbits.net/vm-o1pglaunder-2.4

I suspect submit_writeouts_zone is unlocking a page under
IO since end_buffer_io_async is trying to unlock an already
unlocked page, which blows up...

have fun,

Rik
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