From c89a8eee61540df04fc83f32f51ef0f46ec018b1 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Tue, 5 Aug 2008 15:54:13 +1000
Subject: [PATCH] Allow faulty devices to be removed from a readonly array.

Removing faulty devices from an array is a two stage process.
First the device is moved from being a part of the active array
to being similar to a spare device.  Then it can be removed
by a request from user space.

The first step is currently not performed for read-only arrays,
so the second step can never succeed.

So allow readonly arrays to remove failed devices (which aren't
blocked).

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