[dm-devel] Re: [PATCH v3 00/12] snapshot-merge target
Mike Snitzer
snitzer at redhat.com
Thu Nov 19 14:02:33 UTC 2009
On Thu, Nov 19 2009 at 6:25am -0500,
Andi Kleen <andi at firstfloor.org> wrote:
> Mike Snitzer <snitzer at redhat.com> writes:
>
> > snapshot-merge target, quilt tree is maintained here:
> > http://people.redhat.com/msnitzer/patches/snapshot-merge/kernel/2.6.33/
>
> It might seem trivial to you, but afaik nothing in the whole series
> (nor in the comments in the code) says what snapshot merging
> actually is. Please write meaningful changelogs and comments.
OK, I hadn't noticed because I was so focused on the details.
DM (and LVM) snapshot merging allows a snapshot (its COW store) to be
merged back into the snapshot's origin device.
One expected use of snapshot merging is rollback of a root filesystem
after system upgrades (e.g.: yum update).
Mike
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