md: add ->takeover method for raid5 to be able to take over raid1
authorNeilBrown <neilb@suse.de>
Tue, 31 Mar 2009 03:39:39 +0000 (14:39 +1100)
committerNeilBrown <neilb@suse.de>
Tue, 31 Mar 2009 03:39:39 +0000 (14:39 +1100)
The RAID1 must have two drives and be a suitable size to
be a multiple of a chunksize that isn't too small.

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

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