linux-kernel - [PATCH v2 3/4] md/raid10: fix incorrect done of recovery

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Message-Id: <20230526074551.669792-4-linan666@huaweicloud.com>
Date:   Fri, 26 May 2023 15:45:50 +0800
From:   linan666@...weicloud.com
To:     song@...nel.org, bingjingc@...ology.com, allenpeng@...ology.com,
        alexwu@...ology.com, shli@...com, neilb@...e.de
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        linan122@...wei.com, yukuai3@...wei.com, yi.zhang@...wei.com,
        houtao1@...wei.com, yangerkun@...wei.com
Subject: [PATCH v2 3/4] md/raid10: fix incorrect done of recovery

From: Li Nan <linan122@...wei.com>

Recovery will go to giveup and let chunks_skipped++ in
raid10_sync_request() if there are some bad_blocks, and it will return
max_sector when chunks_skipped >= geo.raid_disks. Now, recovery fail and
data is inconsistent but user think recovery is done, it is wrong.

Fix it by set mirror's recovery_disabled, spare device will not  be added
to here. The same issue alos exists on resync, it will be fixd in future.

Signed-off-by: Li Nan <linan122@...wei.com>
---
 drivers/md/raid10.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 9de9eabff209..aa22782a7330 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3303,6 +3303,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 	int chunks_skipped = 0;
 	sector_t chunk_mask = conf->geo.chunk_mask;
 	int page_idx = 0;
+	int error_disk = -1;
 
 	/*
 	 * Allow skipping a full rebuild for incremental assembly
@@ -3386,7 +3387,20 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 		return reshape_request(mddev, sector_nr, skipped);
 
 	if (chunks_skipped >= conf->geo.raid_disks) {
-		/* if there has been nothing to do on any drive,
+		pr_err("md/raid10:%s: %s fail\n", mdname(mddev),
+			test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?  "resync" : "recovery");
+		if (error_disk >= 0 &&
+		    !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
+			/*
+			 * recovery fail, set mirrors.recovory_disabled,
+			 * device shouldn't be added to there.
+			 */
+			conf->mirrors[error_disk].recovery_disabled =
+						mddev->recovery_disabled;
+			return 0;
+		}
+		/*
+		 * if there has been nothing to do on any drive,
 		 * then there is nothing to do at all..
 		 */
 		*skipped = 1;
@@ -3640,6 +3654,8 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 						       mdname(mddev));
 					mirror->recovery_disabled
 						= mddev->recovery_disabled;
+				} else {
+					error_disk = i;
 				}
 				put_buf(r10_bio);
 				if (rb2)
-- 
2.31.1