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.


On Tue, Jul 20, 2010 at 1:39 AM,  <[email protected]> wrote:
> It seems that the BTRFS_IOC_CLONE ioctl fails when trying to do a
> cross-subvolume clone of a file. Chris Mason suggested in the past ([1])
> that this should be possible. Am I missing something?
>
> [1] http://kerneltrap.org/mailarchive/linux-btrfs/2010/6/10/6884911
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