GEOM_MBR patch for review.

[Pawel Jakub Dawidek]

Hello.

Patch below allows to protect against recursive slices creation in simlar
way as BSD class does this, ie. by calculating md5 sum of the first sector
and checking if provider below us is using metadata from the same sector.

	http://people.freebsd.org/~pjd/patches/geom_mbr.c.2.patch

It allows to remove hack for geoms with rank != 1.
Comments?

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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