[PATCHSET] support FSCTL_DUPLICATE_EXTENTS_TO_FILE

[Christoph Hellwig]

On Wed, May 10, 2017 at 12:20:21PM +0200, Aurélien Aptel via samba-technical wrote:
> I've attended Jeremy's VFS talk last week at SambaXP and he mentionned
> we should be careful about changing that API and generally avoid
> breaking things, similar to the kernel.

In the kernel we break our APIs all the time, and that's a good thing.
We certainly never bump version numbers when changing VFS interfaces.

That being said I know Samba does it differently although I disagree
with the reason.