linux-kernel - Re: [PATCH] f2fs: clean up codes in f2fs_gc related with write

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Message-ID: <58AE4E69.1050104@huawei.com>
Date:   Thu, 23 Feb 2017 10:52:25 +0800
From:   Yunlong Song <yunlong.song@...wei.com>
To:     <jaegeuk@...nel.org>, <cm224.lee@...sung.com>,
        <yuchao0@...wei.com>, <chao@...nel.org>, <sylinux@....com>,
        <miaoxie@...wei.com>
CC:     <bintian.wang@...wei.com>, <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] f2fs: clean up codes in f2fs_gc related with
 write_checkpoint

Ping...

Since has_not_enough_free_secs(sbi, 0, 0) must be true if has_not_enough_free_secs(sbi, sec_freed, 0) is true,
write_checkpoint is sure to execute in both conditions, and segno is NULL_SEGNO in both conditions.

On 2017/2/21 20:43, Yunlong Song wrote:
> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
> ---
>  fs/f2fs/gc.c | 16 ++++------------
>  1 file changed, 4 insertions(+), 12 deletions(-)
>
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 88e5e7b..e5f2569 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -943,23 +943,15 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background)
>  		 * enough free sections, we should flush dent/node blocks and do
>  		 * garbage collections.
>  		 */
> -		if (__get_victim(sbi, &segno, gc_type) ||
> -						prefree_segments(sbi)) {
> -			ret = write_checkpoint(sbi, &cpc);
> -			if (ret)
> -				goto stop;
> -			segno = NULL_SEGNO;
> -		} else if (has_not_enough_free_secs(sbi, 0, 0)) {
> -			ret = write_checkpoint(sbi, &cpc);
> -			if (ret)
> -				goto stop;
> -		}
> +		ret = write_checkpoint(sbi, &cpc);
> +		if (ret)
> +			goto stop;
>  	} else if (gc_type == BG_GC && !background) {
>  		/* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
>  		goto stop;
>  	}
>  
> -	if (segno == NULL_SEGNO && !__get_victim(sbi, &segno, gc_type))
> +	if (!__get_victim(sbi, &segno, gc_type))
>  		goto stop;
>  	ret = 0;
>  


-- 
Thanks,
Yunlong Song