linux-kernel - Re: [f2fs-dev] [PATCH v3] f2fs: avoid inifinite loop to wait for flushing node pages at cp

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Message-ID: <565af47c-8364-d910-8d1c-93645c12e660@huawei.com>
Date:   Mon, 25 May 2020 14:30:25 +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 v3] f2fs: avoid inifinite loop to wait for
 flushing node pages at cp_error

On 2020/5/25 11:56, Jaegeuk Kim wrote:
> Shutdown test is somtimes hung, since it keeps trying to flush dirty node pages

IMO, for umount case, we should drop dirty reference and dirty pages on meta/data
pages like we change for node pages to avoid potential dead loop...

Thanks,

> in an inifinite loop. Let's drop dirty pages at umount in that case.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> v3:
>  - fix wrong unlock
> 
> v2:
>  - fix typos
> 
>  fs/f2fs/node.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index e632de10aedab..e0bb0f7e0506e 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1520,8 +1520,15 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
>  
>  	trace_f2fs_writepage(page, NODE);
>  
> -	if (unlikely(f2fs_cp_error(sbi)))
> +	if (unlikely(f2fs_cp_error(sbi))) {
> +		if (is_sbi_flag_set(sbi, SBI_IS_CLOSE)) {
> +			ClearPageUptodate(page);
> +			dec_page_count(sbi, F2FS_DIRTY_NODES);
> +			unlock_page(page);
> +			return 0;
> +		}
>  		goto redirty_out;
> +	}
>  
>  	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
>  		goto redirty_out;
>