oh, this issue is being discussed here, for example:
https://launchpad.net/ubuntu/+bug/37435

On Wed, Oct 17, 2007 at 07:34:30PM +0200, Oswald Buddenhagen wrote:
> what we really need is a guarantee that the data does not lag behind the
> metadata, but no guarantee that something has actually been written in
> the first place. i'm not aware of such an api - anyone?
> 
we could emulate it, though: spawn a thread that f[data]sync()s and
renames afterwards.
getting this to work isn't going to be trivial, though ...

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