From: NeilBrown <neilb@suse.de>
Date: Thu, 22 Dec 2011 23:17:54 +0000 (+1100)
Subject: md/raid10: prepare data structures for handling replacement.
X-Git-Tag: v3.3-rc1~164^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69335ef3bc5b766f34db2d688be1d35313138bca;p=pandora-kernel.git

md/raid10: prepare data structures for handling replacement.

Allow each slot in the RAID10 to have 2 devices, the want_replacement
and the replacement.

Also an r10bio to have 2 bios, and for resync/recovery allocate the
second bio if there are any replacement devices.

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