linux-kernel - Re: [PATCH -next] ext4: avoid remove directory when directory is corrupted

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Date:   Wed, 22 Jun 2022 14:45:03 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin10@...wei.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz
Subject: Re: [PATCH -next] ext4: avoid remove directory when directory is
 corrupted

On Wed 22-06-22 17:02:23, Ye Bin wrote:
> Now if check directoy entry is corrupted, ext4_empty_dir may return true
> then directory will be removed when file system mounted with "errors=continue".
> In order not to make things worse just return false when directory is corrupted.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

OK, looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/namei.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 47d0ca4c795b..bc503e3275db 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -3066,11 +3066,8 @@ bool ext4_empty_dir(struct inode *inode)
>  		de = (struct ext4_dir_entry_2 *) (bh->b_data +
>  					(offset & (sb->s_blocksize - 1)));
>  		if (ext4_check_dir_entry(inode, NULL, de, bh,
> -					 bh->b_data, bh->b_size, offset)) {
> -			offset = (offset | (sb->s_blocksize - 1)) + 1;
> -			continue;
> -		}
> -		if (le32_to_cpu(de->inode)) {
> +					 bh->b_data, bh->b_size, offset) ||
> +		    le32_to_cpu(de->inode)) {
>  			brelse(bh);
>  			return false;
>  		}
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR