From: Dan Williams <dan.j.williams@intel.com>
Date: Mon, 30 Aug 2010 07:33:33 +0000 (+1000)
Subject: md: don't clear MD_CHANGE_CLEAN in md_update_sb() for external arrays
X-Git-Tag: v2.6.36-rc4~82^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd52b746262c8d77e73903d6608014fb2fcdcd9d;p=pandora-kernel.git

md: don't clear MD_CHANGE_CLEAN in md_update_sb() for external arrays

If this bit is cleared in md_update_sb() the kernel will allow writes to the
array if userspace triggers md_allow_write(), e.g. through stripe_cache_size,
when mdmon is not active.  When mdmon is active the array transitions to
active-idle bypassing write-pending, setting up a race for mdmon to set the
array clean before a write arrives.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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