linux-kernel - Re: [PATCH v2] f2fs: fix get_blocktype_secs bug when segs_per

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Message-ID: <251de9ca-79b1-d509-13dc-87f80554a60d@huawei.com>
Date:   Wed, 31 Oct 2018 11:34:54 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Yunlong Song <yunlong.song@...wei.com>, <jaegeuk@...nel.org>,
        <chao@...nel.org>, <yunlong.song@...oud.com>
CC:     <miaoxie@...wei.com>, <bintian.wang@...wei.com>,
        <shengyong1@...wei.com>, <heyunlei@...wei.com>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] f2fs: fix get_blocktype_secs bug when segs_per_sec is
 larger than 1

On 2018/10/30 20:46, Yunlong Song wrote:
> f2fs_need_SSR uses get_blocktype_secs to calculate needed dirty
> sections, however, for the case segs_per_sec > 1, when needed segs are
> smaller than segs_per_sec, it will just return 0, so fix it.
> 
> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
> ---
>  fs/f2fs/f2fs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 56204a8..ef41ea2 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1842,7 +1842,7 @@ static inline int get_blocktype_secs(struct f2fs_sb_info *sbi, int block_type)
>  	unsigned int segs = (get_pages(sbi, block_type) + pages_per_sec - 1) >>
>  						sbi->log_blocks_per_seg;
>  
> -	return segs / sbi->segs_per_sec;
> +	return (segs + sbi->segs_per_sec - 1) / sbi->segs_per_sec;

roundup(segs, sbi->segs_per_sec)?

Thanks,

>  }
>  
>  static inline block_t valid_user_blocks(struct f2fs_sb_info *sbi)
>