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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Guoqing Jiang <jgq516@gmail.com>,
        Guoqing Jiang <guoqing.jiang@cloud.ionos.com>,
        Song Liu <songliubraving@fb.com>,
        Sasha Levin <sashal@kernel.org>, linux-raid@vger.kernel.org
Subject: [PATCH AUTOSEL 5.3 051/203] md: don't call spare_active in md_reap_sync_thread if all member devices can't work
Date:   Sun, 22 Sep 2019 14:41:17 -0400
Message-Id: <20190922184350.30563-51-sashal@kernel.org>
In-Reply-To: <20190922184350.30563-1-sashal@kernel.org>
References: <20190922184350.30563-1-sashal@kernel.org>
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From: Guoqing Jiang <jgq516@gmail.com>

[ Upstream commit 0d8ed0e9bf9643f27f4816dca61081784dedb38d ]

When add one disk to array, the md_reap_sync_thread is responsible
to activate the spare and set In_sync flag for the new member in
spare_active().

But if raid1 has one member disk A, and disk B is added to the array.
Then we offline A before all the datas are synchronized from A to B,
obviously B doesn't have the latest data as A, but B is still marked
with In_sync flag.

So let's not call spare_active under the condition, otherwise B is
still showed with 'U' state which is not correct.

Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/md/md.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 24638ccedce42..fd62be3ca2871 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9043,7 +9043,8 @@ void md_reap_sync_thread(struct mddev *mddev)
 	/* resync has finished, collect result */
 	md_unregister_thread(&mddev->sync_thread);
 	if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
-	    !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
+	    !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) &&
+	    mddev->degraded != mddev->raid_disks) {
 		/* success...*/
 		/* activate any spares */
 		if (mddev->pers->spare_active(mddev)) {
-- 
2.20.1