BTRFS Support?
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To me it seams like shrinking btrfs is not much trouble. Although I have to admit that I’ve never ever tried this myself.
http://docs.oracle.com/cd/E37670_01/E37355/html/ol_use_case2_btrfs.html and various other sites on the net.
But don’t put any effort into this as long as no one is really asking for this!