Bug#684712: lvm2: automatically filter imsm and ddf formatted disks

[Miquel van Smoorenburg]

I submitted the patch to automatically filter disks with ddf and
imsm superblocks to the linux-lvm mailinglist. I got some helpful
comments and a patch review from Alasdair G Kergon. I rewrote
the patch based on the review, sent it to the mailinglist and
submitted it in the lvm2 (actually, redhat) bug tracker at
https://bugzilla.redhat.com/show_bug.cgi?id=862085

I'm sure this patch will be included in upstream in one of the
upcoming releases.

Attached is the debian version of the patch (v3).

Suggested changelog entry:

* lvm already filters disks that have a mdraid signature, now
  filter DDF and IMSM formatted disks as well - also see
  https://bugzilla.redhat.com/show_bug.cgi?id=862085

Thanks.

Mike.
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