From: NeilBrown <neilb@suse.de>
Date: Tue, 14 Jan 2014 04:55:14 +0000 (+1100)
Subject: md: allow a partially recovered device to be hot-added to an array.
X-Git-Tag: v3.14-rc1~101^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7eb418851f3278de67126ea0c427641ab4792c57;p=pandora-kernel.git

md: allow a partially recovered device to be hot-added to an array.

When adding a new device into an array it is normally important to
clear any stale data from ->recovery_offset else the new device may
not be recovered properly.

However when re-adding a device which is known to be nearly in-sync,
this is not needed and can be detrimental.  The (bitmap-based)
resync will still happen, and further recovery is only needed from
where-ever it was already up to.

So if save_raid_disk is set, signifying a re-add, don't clear
->recovery_offset.

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