linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: flush dirty meta pages when flushing them

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Message-ID: <9ba6e5ef-068d-a925-1eb9-107b0523666c@huawei.com>
Date:   Fri, 15 May 2020 14:29:33 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>, <kernel-team@...roid.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: flush dirty meta pages when flushing
 them

On 2020/5/15 10:15, Jaegeuk Kim wrote:
> Let's guarantee flusing dirty meta pages to avoid infinite loop.

What's the root cause? Race case or meta page flush failure?

Thanks,

> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/checkpoint.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 620a386d82c1a..9a7f695d5adb3 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -1266,6 +1266,9 @@ void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
>  		if (unlikely(f2fs_cp_error(sbi)))
>  			break;
>  
> +		if (type == F2FS_DIRTY_META)
> +			f2fs_sync_meta_pages(sbi, META, LONG_MAX,
> +							FS_CP_META_IO);
>  		io_schedule_timeout(DEFAULT_IO_TIMEOUT);
>  	}
>  	finish_wait(&sbi->cp_wait, &wait);
> @@ -1493,8 +1496,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
>  	sbi->last_valid_block_count = sbi->total_valid_block_count;
>  	percpu_counter_set(&sbi->alloc_valid_block_count, 0);
>  
> -	/* Here, we have one bio having CP pack except cp pack 2 page */
> -	f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
>  	/* Wait for all dirty meta pages to be submitted for IO */
>  	f2fs_wait_on_all_pages(sbi, F2FS_DIRTY_META);
>  
>