From: NeilBrown <neilb@suse.com>
Date: Wed, 15 Jul 2015 07:36:21 +0000 (+1000)
Subject: md/raid5: strengthen check on reshape_position at run.
X-Git-Tag: omap-for-v4.3/fixes-rc1~84^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05256d9884d3276f61537d3d7f5605dc21bd3477;p=pandora-kernel.git

md/raid5: strengthen check on reshape_position at run.

When reshaping, we work in units of the largest chunk size.
If changing from a larger to a smaller chunk size, that means we
reshape more than one stripe at a time.  So the required alignment
of reshape_position needs to take into account both the old
and new chunk size.

This means that both 'here_new' and 'here_old' are calculated with
respect to the same (maximum) chunk size, so testing if they are the
same when delta_disks is zero becomes pointless.

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