On Wed, May 06, 2009 at 08:32:07AM +1000, James Morris wrote:
> On Tue, 5 May 2009, Joel Becker wrote:
>
> > And if your file is actually a disk image, you get snapping of
> > disks for free :-)
>
> Indeed... I think a great use-case scenario for this will be snapshotting
> VM images, as well as fast and space-efficient instantiation of VMs.
I did the initial design work (ocfs2's refcount tree structure)
to support snapping VM images. I came up with the reflink() interface
when I realized the structure would back space-efficient instantiation,
or "shallow clones". Since then, we've been coming up with more and
more fun tricks that the generic reflink() interface allows us to do.
Joel
--
"For every complex problem there exists a solution that is brief,
concise, and totally wrong."
-Unknown
Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@xxxxxxxxxx
Phone: (650) 506-8127
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