linux-kernel - [PATCH 3.18 32/47] md/raid10: skip spare disk as first disk

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Date:   Fri, 23 Mar 2018 10:55:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guoqing Jiang <gqjiang@...e.com>,
        NeilBrown <neilb@...e.com>, Shaohua Li <shli@...com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 32/47] md/raid10: skip spare disk as first disk

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/raid10.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4132,6 +4132,7 @@ static int raid10_start_reshape(struct m
 				diff = 0;
 			if (first || diff < min_offset_diff)
 				min_offset_diff = diff;
+			first = 0;
 		}
 	}