Excerpts from Christoph Hellwig's message of 2011-04-15 15:24:12 -0400:
> Sorry, but this is too ugly to live.  If the reason for this really is
> good enough we'll just need to push the filemap_write_and_wait_range
> and i_mutex locking into every ->fsync instance.
> 

Which part is too ugly to live?  The special op? New parameters?

The unconditional taking of i_mutex hurts a lot, especially on directory
fsyncs, so I'd love to get rid of it.

-chris
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