Re: notes on volatile write caches vs fdatasync

From: Christoph Hellwig
Date: Thu Aug 27 2009 - 14:50:30 EST

On Thu, Aug 27, 2009 at 03:02:52PM +0200, Jan Kara wrote:
> I've noticed this as well when we were tracking some problems Pavel
> Machek found with his USB stick. I even wrote a patch at the time
> but it somehow died out. Now, the situation should be simpler with
> fsync paths cleaned up... BTW: People wanted this to be configurable per
> block device which probably makes sence...

Yeah, that patch is pretty ugly. We need to do these cache flushes
in ->fsync (and ->sync_fs if any filesystem really doesn't guarantee to
issue transaction there after data has been written). Adding it
to simple_fsync too sounds good to me.
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