From d66b1b395a59027a1c054e1fc57d582cb4194491 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Fri, 8 Aug 2014 15:40:24 +1000
Subject: [PATCH] md: don't allow bitmap file to be added to raid0/linear.

An array can only accept a bitmap if it will call bitmap_daemon_work
periodically, which means it needs a thread running.

If there is no thread, don't allow a bitmap to be added.

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