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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Wei Shuyu <wsy@dogben.com>,
        Guoqing Jiang <jiangguoqing@kylinos.cn>,
        Song Liu <song@kernel.org>
Subject: [PATCH 5.4 69/85] md/raid10: properly indicate failure when ending a failed write request
Date:   Tue, 10 Aug 2021 19:30:42 +0200
Message-Id: <20210810172950.576307848@linuxfoundation.org>
In-Reply-To: <20210810172948.192298392@linuxfoundation.org>
References: <20210810172948.192298392@linuxfoundation.org>
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From: Wei Shuyu <wsy@dogben.com>

commit 5ba03936c05584b6f6f79be5ebe7e5036c1dd252 upstream.

Similar to [1], this patch fixes the same bug in raid10. Also cleanup the
comments.

[1] commit 2417b9869b81 ("md/raid1: properly indicate failure when ending
                         a failed write request")
Cc: stable@vger.kernel.org
Fixes: 7cee6d4e6035 ("md/raid10: end bio when the device faulty")
Signed-off-by: Wei Shuyu <wsy@dogben.com>
Acked-by: Guoqing Jiang <jiangguoqing@kylinos.cn>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/md/raid1.c  |    2 --
 drivers/md/raid10.c |    4 ++--
 2 files changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -452,8 +452,6 @@ static void raid1_end_write_request(stru
 		/*
 		 * When the device is faulty, it is not necessary to
 		 * handle write error.
-		 * For failfast, this is the only remaining device,
-		 * We need to retry the write without FailFast.
 		 */
 		if (!test_bit(Faulty, &rdev->flags))
 			set_bit(R1BIO_WriteError, &r1_bio->state);
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -470,12 +470,12 @@ static void raid10_end_write_request(str
 			/*
 			 * When the device is faulty, it is not necessary to
 			 * handle write error.
-			 * For failfast, this is the only remaining device,
-			 * We need to retry the write without FailFast.
 			 */
 			if (!test_bit(Faulty, &rdev->flags))
 				set_bit(R10BIO_WriteError, &r10_bio->state);
 			else {
+				/* Fail the request */
+				set_bit(R10BIO_Degraded, &r10_bio->state);
 				r10_bio->devs[slot].bio = NULL;
 				to_put = bio;
 				dec_rdev = 1;