File cloning across subvolumes with BTRFS_IOC_CLONE ioctl

[redneb@xxxxxxx]

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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