From: NeilBrown <neilb@suse.com>
Date: Mon, 6 Jul 2015 02:26:57 +0000 (+1000)
Subject: md: close some races between setting and checking sync_action.
X-Git-Tag: omap-for-v4.3/fixes-rc1~84^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=985ca973b68cac0adfa83497db231da7f99c6ed9;p=pandora-kernel.git

md: close some races between setting and checking sync_action.

When checking sync_action in a script, we want to be sure it is
as accurate as possible.
As resync/reshape etc doesn't always start immediately (a separate
thread is scheduled to do it), it is best if 'action_show'
checks if MD_RECOVER_NEEDED is set (which it does) and in that
case reports what is likely to start soon (which it only sometimes
does).

So:
 - report 'reshape' if reshape_position suggests one might start.
 - set MD_RECOVERY_RECOVER in raid1_reshape(), because that is very
   likely to happen next.

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