On Mon, Aug 12, 2013 at 06:14:55PM +0200, Jan Kara wrote:

  Hi Dave,

  I remembered about this patch set and realized I didn't get reply from
you regarding the following question (see quoted email below for details):
Do you really need to defer completion of appending direct IO? Because
generic code makes sure appending direct IO isn't async and thus
dio_complete() -> xfs_end_io_direct_write() gets called directly from
do_blockdev_direct_IO(). I.e. from a normal context and not from interrupt.

Hi Jan, sorry I haven't got back to you sooner - I've had a lot
of stuff to deal with over the past couple of weeks.

The issue is that one part of the code expects deferral , and the
other part of the code isn't doing a deferral, and I never got
around to determining which was correct. I didn't connect the dots
between aio/appending and sync dispatch meaning that the way it is
operating now is fine - i.e. that the fact it doesn't call the
deferral completion path is OK and was intended to operate that
way by Christoph.

So leaving the code as it is without a deferal is fine.

I've already addressed rest of your comments so this is the only item that
is remaining.

Great :)

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com