Excerpts from Christoph Hellwig's message of 2011-03-31 02:36:36 -0400:
> On Thu, Mar 31, 2011 at 12:00:11AM -0400, Larry D'Anna wrote:
> > This is a simple patch to allow reflinks to be made crossing subvolume
> > boundaries.
> 
> NAK.  subvolumes will have to become vfsmounts sooner or later, and we
> really must not support any operations spanning mountpoints.
> 

Sorry, I disagree here.  reflinks were always intended to be able to
span subvolumes.  There's no conflict at all because they span different
inodes.

-chris
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