From ba1b41b6b4e30cb66ae2775faadea05cae3ce61c Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Fri, 14 Jan 2011 09:14:34 +1100
Subject: [PATCH] md: range check slot number when manually adding a spare.

When adding a spare to an active array, we should check the slot
number, but allow it to be larger than raid_disks if a reshape
is being prepared.

Apply the same test when adding a device to an
array-under-construction.  It already had most of the test in place,
but not quite all.

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