linux-kernel - Re: [PATCH 1/2] md: factor out a helper exceed_read_errors() to check read

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Date:   Mon, 11 Dec 2023 15:59:39 +0800
From:   Li Nan <linan666@...weicloud.com>
To:     Song Liu <song@...nel.org>, linan666@...weicloud.com
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yi.zhang@...wei.com, houtao1@...wei.com,
        yangerkun@...wei.com
Subject: Re: [PATCH 1/2] md: factor out a helper exceed_read_errors() to check
 read_errors



在 2023/12/9 2:38, Song Liu 写道:
> On Sun, Dec 3, 2023 at 11:04 PM <linan666@...weicloud.com> wrote:
>>
>> From: Li Nan <linan122@...wei.com>
>>
>> Move check_decay_read_errors() to raid1-10.c and factor out a helper
>> exceed_read_errors() to check if read_errors exceeds the limit, so that
>> raid1 can also use it. There are no functional changes.
>>
>> Signed-off-by: Li Nan <linan122@...wei.com>
> [...]
>> +static inline bool exceed_read_errors(struct mddev *mddev, struct md_rdev *rdev)
>> +{
>> +       int max_read_errors = atomic_read(&mddev->max_corr_read_errors);
>> +       int read_errors;
>> +
>> +       check_decay_read_errors(mddev, rdev);
>> +       read_errors =  atomic_inc_return(&rdev->read_errors);
>> +       if (read_errors > max_read_errors) {
>> +               pr_notice("md:%s: %pg: Raid device exceeded read_error threshold [cur %d:max %d]\n",
>> +                         mdname(mddev), rdev->bdev, read_errors, max_read_errors);
>> +               pr_notice("md:%s: %pg: Failing raid device\n",
>> +                         mdname(mddev), rdev->bdev);
> 
> This changed the print message from "md/raid10:" to "md:". We should
> try to avoid
> such changes. How about we do something like the following?
> 
> Thanks,
> Song
> 
> diff --git i/drivers/md/raid1-10.c w/drivers/md/raid1-10.c
> index 3f22edec70e7..6c0ef0fe6ba7 100644
> --- i/drivers/md/raid1-10.c
> +++ w/drivers/md/raid1-10.c
> @@ -173,3 +173,10 @@ static inline void
> raid1_prepare_flush_writes(struct bitmap *bitmap)
>          else
>                  md_bitmap_unplug(bitmap);
>   }
> +
> +static inline bool exceed_read_errors(struct mddev *mddev, struct
> md_rdev *rdev)
> +{
> +       pr_notice("md/" RAID_1_10_NAME ":%s: %pg: Raid device ...\n",
> +                 ...);
> +       ...
> +}
> diff --git i/drivers/md/raid1.c w/drivers/md/raid1.c
> index 9348f1709512..412e98d02a05 100644
> --- i/drivers/md/raid1.c
> +++ w/drivers/md/raid1.c
> @@ -49,6 +49,7 @@ static void lower_barrier(struct r1conf *conf,
> sector_t sector_nr);
>   #define raid1_log(md, fmt, args...)                            \
>          do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 "
> fmt, ##args); } while (0)
> 
> +#define RAID_1_10_NAME "raid1"
>   #include "raid1-10.c"
> 
>   #define START(node) ((node)->start)
> diff --git i/drivers/md/raid10.c w/drivers/md/raid10.c
> index 375c11d6159f..a1531b5f15e3 100644
> --- i/drivers/md/raid10.c
> +++ w/drivers/md/raid10.c
> @@ -77,6 +77,8 @@ static void end_reshape(struct r10conf *conf);
>   #define raid10_log(md, fmt, args...)                           \
>          do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid10 "
> fmt, ##args); } while (0)
> 
> +#define RAID_1_10_NAME "raid10"
> +
>   #include "raid1-10.c"
> 
>   #define NULL_CMD
> 
> [...]
> 
> .

I agree. Let me improve this in v2.


-- 
Thanks,
Nan