linux-ext4 - Re: [PATCH v5 6/8] ext4: Log error when lookup of encoded dentry fails

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Date:   Wed, 18 May 2022 12:23:15 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        kernel@...labora.com
Subject: Re: [PATCH v5 6/8] ext4: Log error when lookup of encoded dentry
 fails

On Wed, May 18, 2022 at 01:23:18PM -0400, Gabriel Krisman Bertazi wrote:
> If the volume is in strict mode, ext4_ci_compare can report a broken
> encoding name.  This will not trigger on a bad lookup, which is caught
> earlier, only if the actual disk name is bad.
> 
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> 
> ---
> 
> changes since v4:
>   - Reword error message (Eric)
> 
> Changes since v1:
>   - reword error message "file in directory" -> "filename" (Eric)
> ---
>  fs/ext4/namei.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 98295b03a57c..8fbb35187f72 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1396,6 +1396,9 @@ static bool ext4_match(struct inode *parent,
>  			 * only case where it happens is on a disk
>  			 * corruption or ENOMEM.
>  			 */
> +			if (ret == -EINVAL)
> +				EXT4_ERROR_INODE(parent,
> +					"Directory contains filename that is invalid UTF-8");
>  			return false;
>  		}
>  		return ret;

Reviewed-by: Eric Biggers <ebiggers@...gle.com>

- Eric