Can moving data to a subvolume not take as long as a fully copy?

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I made a mistake and copied data in the root of a new btrfs filesystem.
I created a subvolume, and used mv to put everything in there.
Something like:
cd /mnt
btrfs subvolume create dir
mv * dir

Except it's been running for over a day now (ok, it's 5TB of data)

Looks like mv is really copying all the data as if it were an entirely
different filesystem.

Is there not a way to short circuit this and only update the metadata?

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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