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

[Chao Yu <yuchao0@huawei.com>]

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@kernel.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;
>