linux-kernel - Re: [PATCH v2 2/2] f2fs: add f2fs_bug_on() in f2fs_quota

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Message-ID: <aCOCaDyFm-etmFiF@google.com>
Date: Tue, 13 May 2025 17:33:28 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] f2fs: add f2fs_bug_on() in f2fs_quota_read()

On 05/13, Chao Yu wrote:
> mapping_read_folio_gfp() will return a folio, it should always be
> uptodate, let's check folio uptodate status to detect any potenial
> bug.
> 
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
> v2:
> - just add f2fs_bug_on(), get rid of error handling.
>  fs/f2fs/super.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 0ee783224953..8c77a625427c 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2973,6 +2973,12 @@ static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
>  			goto repeat;
>  		}
>  
> +		/*
> +		 * should never happen, just leave f2fs_bug_on() here to catch
> +		 * any potential bug.
> +		 */
> +		f2fs_bug_on(sbi, !folio_test_uptodate(folio));

Applied with		    F2FS_SB(sb)

> +
>  		memcpy_from_folio(data, folio, offset, tocopy);
>  		f2fs_folio_put(folio, true);
>  
> -- 
> 2.49.0