[PATCH] vg_validate support for pvmove LVs (BZ 662669)

[Petr Rockai <prockai@redhat.com>]

Hi,

I am attaching patch that revs up vg_validate somewhat, to catch some
malformed (internal) pvmoveN LVs. Currently, it checks that the segments
in there are either linear or mirrored with 2 legs. Unfortunately, I
haven't been able to come up with any further restrictions that wouldn't
break the existing tests on some count. It seems that vg_validate is
called on VGs where linear segments exist (although I have been unable
to capture them at vg_commit time), and they are interspersed with
mirrored segments in the same LV. I have already spent a lot of time on
this, so if someone wants to come up with a stricter check, please feel
free to do so.

Anyway, the attached patch does catch the bug triggered by kabi's test
attached to BZ 654447. For the other bug (dangling reference) I will
submit a separate BZ and a separate patch, hopefully tomorrow.

Yours,
   Petr

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