linux-kernel - [PATCH 4.16 118/196] dm raid: fix nosync status

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Date:   Sun, 22 Apr 2018 15:52:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Heinz Mauelshagen <heinzm@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.16 118/196] dm raid: fix nosync status

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

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

From: Heinz Mauelshagen <heinzm@...hat.com>

commit 880bcce0dcc3172fe865352b492c41d85290cb8d upstream.

Fix a race for "nosync" activations providing "aa.." device health
characters and "0/N" sync ratio rather than "AA..." and "N/N".  Occurs
when status for the raid set is retrieved during resume before the MD
sync thread starts and clears the MD_RECOVERY_NEEDED flag.

Cc: stable@...r.kernel.org # 4.16+
Signed-off-by: Heinz Mauelshagen <heinzm@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-raid.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3408,7 +3408,8 @@ static sector_t rs_get_progress(struct r
 		set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
 
 	} else {
-		if (!test_bit(MD_RECOVERY_INTR, &recovery) &&
+		if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags) &&
+		    !test_bit(MD_RECOVERY_INTR, &recovery) &&
 		    (test_bit(MD_RECOVERY_NEEDED, &recovery) ||
 		     test_bit(MD_RECOVERY_RESHAPE, &recovery) ||
 		     test_bit(MD_RECOVERY_RUNNING, &recovery)))