The link across subvolumes is not allowable. In the beginning it was
possible, but that was source of bugs. See the thread "Hard link across
subvolumes"
http://www.mail-archive.com/linux-btrfs <at> vger.kernel.org/msg03286.html
Similar for cp --reflink across subvolumes - also won't work.
If btrfs is to support deduplication one day, it has to work across
subvolumes - otherwise, it won't be very useful.
--
Tomasz Chmielewski
http://wpkg.org
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