linux-kernel - Re: [PATCH] f2fs: fix incorrect return value in f2fs_sanity_check

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Date:   Fri, 24 Sep 2021 11:50:21 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Chao Yu <chao@...nel.org>
Cc:     jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Pavel Machek <pavel@...x.de>
Subject: Re: [PATCH] f2fs: fix incorrect return value in
 f2fs_sanity_check_ckpt()

Hi!

> This code looks quite confused: part of function returns 1 on
> corruption, part returns -errno. The problem is not stable-specific.
> 
> [1] https://lkml.org/lkml/2021/9/19/207
> 
> Let's fix to make 'insane cp_payload case' to return 1 rater than
> EFSCORRUPTED, so that return value can be kept consistent for all
> error cases, it can avoid confusion of code logic.
> 
> Fixes: 65ddf6564843 ("f2fs: fix to do sanity check for sb/cp fields correctly")
> Reported-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Chao Yu <chao@...nel.org>

Reviewed-by: Pavel Machek <pavel@...x.de>

(This is good minimal fix, but eventually I believe the function
should switch to 0/-errno... for consistency with rest of kernel).

Thank you,
								Pavel
								
> +++ b/fs/f2fs/super.c
> @@ -3487,7 +3487,7 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
>  		NR_CURSEG_PERSIST_TYPE + nat_bits_blocks >= blocks_per_seg)) {
>  		f2fs_warn(sbi, "Insane cp_payload: %u, nat_bits_blocks: %u)",
>  			  cp_payload, nat_bits_blocks);
> -		return -EFSCORRUPTED;
> +		return 1;
>  	}
>  
>  	if (unlikely(f2fs_cp_error(sbi))) {

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