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Subject: Re: [f2fs-dev] [PATCH] f2fs: flush dirty meta pages when flushing
 them
To:     Jaegeuk Kim <jaegeuk@kernel.org>
CC:     <linux-kernel@vger.kernel.org>,
        <linux-f2fs-devel@lists.sourceforge.net>, <kernel-team@android.com>
References: <20200515021554.226835-1-jaegeuk@kernel.org>
 <9ba6e5ef-068d-a925-1eb9-107b0523666c@huawei.com>
 <20200515144509.GA46028@google.com>
From:   Chao Yu <yuchao0@huawei.com>
Message-ID: <cd964a56-b2a7-48de-97a6-5d89d9a590a3@huawei.com>
Date:   Mon, 18 May 2020 10:21:20 +0800
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On 2020/5/15 22:45, Jaegeuk Kim wrote:
> On 05/15, Chao Yu wrote:
>> 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?
> 
> Investigating, but at least, this can avoid the inifinite loop there.

Hmm... this fix may cover the root cause..

Thanks,

> 
> V2:
> 
>>From c60ce8e7178004fd6cba96e592247e43b5fd98d8 Mon Sep 17 00:00:00 2001
> From: Jaegeuk Kim <jaegeuk@kernel.org>
> Date: Wed, 13 May 2020 21:12:53 -0700
> Subject: [PATCH] f2fs: flush dirty meta pages when flushing them
> 
> Let's guarantee flusing dirty meta pages to avoid infinite loop.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
>  fs/f2fs/checkpoint.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 620a386d82c1a..3dc3ac6fe1432 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);
>