On Wed, Jul 21, 2010 at 11:11:13AM -0400, Jérôme Poulin wrote:
> I've got the same problem, and that post clearly seems to say it is possible.
> cp --reflink=always source subvolume1/   gives me:
> cp: failed to clone `xxxx': Invalid cross-device link
> 
> Even on the same subvolume I get 10% of the files telling me the same.
> 
> btrfs-bcp copy the files in its integrity.

Ok, this is a bug in the ioctl.  I'll fix it up.

-chris
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