linux-kernel - Re: [PATCH v5] xfs: introduce protection for drop nlink

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Message-ID: <20231009183148.GA214073@frogsfrogsfrogs>
Date:   Mon, 9 Oct 2023 11:31:48 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     cheng.lin130@....com.cn
Cc:     david@...morbit.com, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, jiang.yong5@....com.cn,
        wang.liang82@....com.cn, liu.dong3@....com.cn
Subject: Re: [PATCH v5] xfs: introduce protection for drop nlink

On Mon, Oct 09, 2023 at 04:45:57PM +0800, cheng.lin130@....com.cn wrote:
> From: Cheng Lin <cheng.lin130@....com.cn>
> When abnormal drop_nlink are detected on the inode,
> return error, to avoid corruption propagation.
> 
> Signed-off-by: Cheng Lin <cheng.lin130@....com.cn>
> ---
>  fs/xfs/xfs_inode.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index 9e62cc500..752e6aeba 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -919,6 +919,14 @@ xfs_droplink(
>  	xfs_trans_t *tp,
>  	xfs_inode_t *ip)
>  {
> +

No need for the extra whitespace here.

> +	if (VFS_I(ip)->i_nlink == 0) {
> +		xfs_alert(ip->i_mount,
> +			  "%s: Attempt to drop inode (%llu) with nlink zero.",
> +			  __func__, ip->i_ino);
> +		return -EFSCORRUPTED;
> +	}

With that fixed,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> +
>  	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
> 
>  	drop_nlink(VFS_I(ip));
> -- 
> 2.18.1