linux-kernel - Re: [PATCH] f2fs: compress: remove unneed check condition

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Message-ID: <YID1sqemJVeBcdqD@google.com>
Date:   Wed, 21 Apr 2021 21:04:02 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH] f2fs: compress: remove unneed check condition

On 04/21, Chao Yu wrote:
> In only call path of __cluster_may_compress(), __f2fs_write_data_pages()
> has checked SBI_POR_DOING condition, and also cluster_may_compress()
> has checked CP_ERROR_FLAG condition, so remove redundant check condition
> in __cluster_may_compress() for cleanup.

I think cp_error can get any time without synchronization. Is it safe to say
it's redundant?

> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/compress.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 3c9d797dbdd6..532c311e3a89 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -906,11 +906,6 @@ static bool __cluster_may_compress(struct compress_ctx *cc)
>  
>  		f2fs_bug_on(sbi, !page);
>  
> -		if (unlikely(f2fs_cp_error(sbi)))
> -			return false;
> -		if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> -			return false;
> -
>  		/* beyond EOF */
>  		if (page->index >= nr_pages)
>  			return false;
> -- 
> 2.29.2