kill unnecessary SB sync wake-ups + cleanups

Hi,

here is v6 of my SB sync wakups killing patches, v5 may be found:
http://marc.info/?l=linux-fsdevel&m=127583599911620&...

This is more of a reminder re-send, I did not get any feed-back for
v5. Not much changes since v5:

1. Drop patches which fix race conditions for s_dirty changes WRT actual
   write-back - these things are independent and I am planning to go through
   that separately.
2. Add "Acked-by" to the btrfs patch.
3. Fold all per-fs patches which introduce SB accessors into one big patch.

Artem.
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