From f04ebb0be74283b32f539c7f6b84d5cfcaa0ead3 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Mon, 16 Feb 2015 14:51:54 +1100
Subject: [PATCH] md/raid10: round up to bdev_logical_block_size in
 narrow_write_error.

RAID10 version of earlier fix for RAID1.  We must never initiate
IO with sizes less that logical_block_size.

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