Btrfs devel - Jan 2014 - Is there a lightweight copy from one subvolume to another?

If I have 
/mnt/btrfs1/subvol1
/mnt/btrfs1/subvol2

Can I copy/move data from subvol1 to subvol2 without having to physically
copy all the blocks as if it were an entirely different filesystem?

reflink doesn't work for this:
gargamel [mc]# cp -av --reflink=always misc/olympic Video/misc/
`misc/olympic' -> `Video/misc/olympic'
`misc/olympic/file.avi' -> `Video/misc/olympic/file.avi'
cp: failed to clone `Video/misc/olympic/file.avi' from
`misc/olympic/file.avi': Invalid cross-device link

Was there another way?

Thanks,
Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" -
A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/  
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