linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: add bug_on when f2fs

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Message-ID: <7f05bef6-929f-ea7b-9d60-e9a6d8e70d3c@kernel.org>
Date:   Sat, 14 Oct 2017 08:17:13 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yunlong Song <yunlong.song@...wei.com>, jaegeuk@...nel.org,
        yuchao0@...wei.com, yunlong.song@...oud.com
Cc:     linux-fsdevel@...r.kernel.org, miaoxie@...wei.com,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: add bug_on when f2fs_gc even fails to
 get one victim

On 2017/10/13 21:31, Yunlong Song wrote:
> This can help us to debug on some corner case.

I can hit this bugon with generic/015 of fstest easily, could have a look at
this?

Thanks,

> 
> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/gc.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 197ebf4..2b03202 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -986,6 +986,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>  		.ilist = LIST_HEAD_INIT(gc_list.ilist),
>  		.iroot = RADIX_TREE_INIT(GFP_NOFS),
>  	};
> +	bool need_fggc = false;
>  
>  	trace_f2fs_gc_begin(sbi->sb, sync, background,
>  				get_pages(sbi, F2FS_DIRTY_NODES),
> @@ -1018,8 +1019,10 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>  			if (ret)
>  				goto stop;
>  		}
> -		if (has_not_enough_free_secs(sbi, 0, 0))
> +		if (has_not_enough_free_secs(sbi, 0, 0)) {
>  			gc_type = FG_GC;
> +			need_fggc = true;
> +		}
>  	}
>  
>  	/* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
> @@ -1028,6 +1031,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
>  		goto stop;
>  	}
>  	if (!__get_victim(sbi, &segno, gc_type)) {
> +		f2fs_bug_on(sbi, !total_freed && need_fggc);
>  		ret = -ENODATA;
>  		goto stop;
>  	}
>