linux-kernel - Re: [PATCH 2/3] md/raid10: fix incorrect done of recovery

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Date:   Mon, 22 May 2023 21:54:33 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     linan666@...weicloud.com, song@...nel.org, shli@...com,
        allenpeng@...ology.com, alexwu@...ology.com,
        bingjingc@...ology.com, neilb@...e.de
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        linan122@...wei.com, yi.zhang@...wei.com, houtao1@...wei.com,
        yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH 2/3] md/raid10: fix incorrect done of recovery

Hi,

在 2023/05/22 19:54, linan666@...weicloud.com 写道:
> 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 and spare device shouln't be
> added to here.
> 
> Signed-off-by: Li Nan <linan122@...wei.com>
> ---
>   drivers/md/raid10.c | 16 +++++++++++++++-
>   1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index e21502c03b45..70cc87c7ee57 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 +3387,18 @@ 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");

Line exceed 80 columns, and following.
> +		if (error_disk >= 0 && !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {

Resync has the same problem, right?

Thanks,
Kuai
> +			/*
> +			 * 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 +3652,8 @@ 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)
>