From: NeilBrown <neilb@suse.de>
Date: Wed, 24 Apr 2013 01:42:40 +0000 (+1000)
Subject: md: never update metadata when array is read-only.
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~89^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d87f064f5874ba60814c6ccac67104761be5b26c;p=pandora-kernel.git

md: never update metadata when array is read-only.

Normally we don't even try to update the metadata if
the array is read-only.  However future patches
will increase the number of things that can happen on a read-only
array, so it is safest to explicitly disable this.

Every time that mddev->ro is set to 0, either
 - md_update_sb will be called again (at least if MD_CHANGE_DEVS
   is set) or
 - the mddev->thread is scheduled, which will also run
   md_update_sb if needed.

So this is safe: if the array ever become read-write the
metadata will be updated.

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

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