linux-kernel - Re: [PATCH v2 3/4] md/raid10: fix wrong setting of max_corr_read

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Date:   Sat, 6 May 2023 10:02:30 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     linan666@...weicloud.com, song@...nel.org, neilb@...e.de,
        Rob.Becker@...erbed.com
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 v2 3/4] md/raid10: fix wrong setting of
 max_corr_read_errors

Hi,

在 2023/05/06 9:23, linan666@...weicloud.com 写道:
> From: Li Nan <linan122@...wei.com>
> 
> max_corr_read_errors should not be negative number. Change it to
> unsigned int where use it.
> 

Looks good, feel free to add:

Reviewed-by: Yu Kuai <yukuai3@...wei.com>

> Fixes: 1e50915fe0bb ("raid: improve MD/raid10 handling of correctable read errors.")
> Signed-off-by: Li Nan <linan122@...wei.com>
> ---
>   drivers/md/md.c     | 2 +-
>   drivers/md/raid10.c | 5 +++--
>   2 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index fd5c3babcd6d..4a1e566d6bdc 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -4486,7 +4486,7 @@ __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_stor
>   
>   static ssize_t
>   max_corrected_read_errors_show(struct mddev *mddev, char *page) {
> -	return sprintf(page, "%d\n",
> +	return sprintf(page, "%u\n",
>   		       atomic_read(&mddev->max_corr_read_errors));
>   }
>   
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index 4fcfcb350d2b..4d615fcc6a50 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -2727,7 +2727,8 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
>   	int sect = 0; /* Offset from r10_bio->sector */
>   	int sectors = r10_bio->sectors;
>   	struct md_rdev *rdev;
> -	int max_read_errors = atomic_read(&mddev->max_corr_read_errors);
> +	unsigned int max_read_errors =
> +			atomic_read(&mddev->max_corr_read_errors);
>   	int d = r10_bio->devs[r10_bio->read_slot].devnum;
>   
>   	/* still own a reference to this rdev, so it cannot
> @@ -2743,7 +2744,7 @@ static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10
>   	check_decay_read_errors(mddev, rdev);
>   	atomic_inc(&rdev->read_errors);
>   	if (atomic_read(&rdev->read_errors) > max_read_errors) {
> -		pr_notice("md/raid10:%s: %pg: Raid device exceeded read_error threshold [cur %d:max %d]\n",
> +		pr_notice("md/raid10:%s: %pg: Raid device exceeded read_error threshold [cur %u:max %u]\n",
>   			  mdname(mddev), rdev->bdev,
>   			  atomic_read(&rdev->read_errors), max_read_errors);
>   		pr_notice("md/raid10:%s: %pg: Failing raid device\n",
>