md: add takeover support for converting raid6 back into raid5
authorNeilBrown <neilb@suse.de>
Tue, 31 Mar 2009 03:57:20 +0000 (14:57 +1100)
committerNeilBrown <neilb@suse.de>
Tue, 31 Mar 2009 03:57:20 +0000 (14:57 +1100)
If a raid6 is still in the layout that comes from converting raid5
into a raid6. this will allow us to convert it back again.

Signed-off-by: NeilBrown <neilb@suse.de>

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