linux-kernel - Re: [PATCH] f2fs: prevent setting ioprio of thread not in merge mode

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Message-ID: <YBiBzP2YC3j1Q8Ry@google.com>
Date:   Mon, 1 Feb 2021 14:33:48 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Daeho Jeong <daeho43@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [PATCH] f2fs: prevent setting ioprio of thread not in merge mode

Thanks.
Merged into the original patch.

On 02/01, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
> 
> It causes a crash to change the ioprio of checkpoint thread not in
> checkpoint=merge. I fixed that to prevent setting the ioprio of the
> thread when checkpoint=merge is not enabled.
> 
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
>  fs/f2fs/sysfs.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 100608bcd517..e38a7f6921dd 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -357,8 +357,12 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>  			return -EINVAL;
>  
>  		cprc->ckpt_thread_ioprio = IOPRIO_PRIO_VALUE(class, data);
> -		ret = set_task_ioprio(cprc->f2fs_issue_ckpt,
> -				cprc->ckpt_thread_ioprio);
> +		if (test_opt(sbi, MERGE_CHECKPOINT)) {
> +			ret = set_task_ioprio(cprc->f2fs_issue_ckpt,
> +					cprc->ckpt_thread_ioprio);
> +			if (ret)
> +				return ret;
> +		}
>  
>  		return count;
>  	}
> -- 
> 2.30.0.365.g02bc693789-goog