From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gabriel de Perthuis <g2p.code-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Resizing a backing device
Date: Wed, 27 Mar 2013 19:13:52 +0000 (UTC)
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Hola,

Is there a way to notify bcache that a backing device has been resized?

I've tried to do it from sysfs, but after stopping the backing device it
disappears from sysfs and I can't start it again, at least not without
unregistering entirely (which as I understand it will wipe the cached 
data).  A live method would be much better.