linux-kernel - [PATCH AUTOSEL for 4.9 133/190] md/raid10: skip spare disk as 'first' disk

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Date:   Thu, 8 Mar 2018 04:59:50 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Shaohua Li <shli@...com>, Guoqing Jiang <gqjiang@...e.com>,
        NeilBrown <neilb@...e.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 133/190] md/raid10: skip spare disk as 'first'
 disk

From: Shaohua Li <shli@...com>

[ Upstream commit b506335e5d2b4ec687dde392a3bdbf7601778f1d ]

Commit 6f287ca(md/raid10: reset the 'first' at the end of loop) ignores
a case in reshape, the first rdev could be a spare disk, which shouldn't
be accounted as the first disk since it doesn't include the offset info.

Fix: 6f287ca(md/raid10: reset the 'first' at the end of loop)
Cc: Guoqing Jiang <gqjiang@...e.com>
Cc: NeilBrown <neilb@...e.com>
Signed-off-by: Shaohua Li <shli@...com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/md/raid10.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b1daff78f7b2..18a4271bf569 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4089,6 +4089,7 @@ static int raid10_start_reshape(struct mddev *mddev)
 				diff = 0;
 			if (first || diff < min_offset_diff)
 				min_offset_diff = diff;
+			first = 0;
 		}
 	}
 
-- 
2.14.1