Buffered write deadlock fix and new aops for 2.6.21-rc6-mm1

Hi, these patches are against 2.6.21-rc6-mm1. Aside from OCFS2, there
were no major clashes between -mm and mainline diffs, which is nice.

These patches aim to solve the long standing buffered write deadlocks,
and then go on to introduce a pair of new write a_op methods which
allow the deadlock to be solved without taking the performance hit of
the backwards compatible solutions using the old APIs.

Reiserfs (and Reiser4, in -mm) are the only filesystems left unconverted,
although there are a number of less common ones still untested.

Thanks,
Nick

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