From: NeilBrown <neilb@suse.de>
Date: Mon, 19 Mar 2012 01:46:37 +0000 (+1100)
Subject: md: allow re-add to failed arrays.
X-Git-Tag: v3.4-rc1~147^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc10c643e8a8d008fd16dd6706e9e0018eadf8d2;p=pandora-kernel.git

md: allow re-add to failed arrays.

When an array is failed (some data inaccessible) then there is no
point attempting to add a spare as it could not possibly be recovered.

However that may be value in re-adding a recently removed device.
e.g. if there is a write-intent-bitmap and it is clear, then access
to the data could be restored by this action.

So don't reject a re-add to a failed array for RAID10 and RAID5 (the
only arrays  types that check for a failed array).

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