linux-kernel - Re: [PATCH v3] xfs: introduce protection for drop nlink

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Message-ID: <ZQJIyx419cw24ppF@dread.disaster.area>
Date:   Thu, 14 Sep 2023 09:42:03 +1000
From:   Dave Chinner <david@...morbit.com>
To:     cheng.lin130@....com.cn
Cc:     djwong@...nel.org, 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 v3] xfs: introduce protection for drop nlink

On Wed, Sep 13, 2023 at 05:44:45PM +0800, cheng.lin130@....com.cn wrote:
> From: Cheng Lin <cheng.lin130@....com.cn>
> 
> When abnormal drop_nlink are detected on the inode,
> shutdown filesystem, to avoid corruption propagation.
> 
> Signed-off-by: Cheng Lin <cheng.lin130@....com.cn>
> ---
>  fs/xfs/xfs_inode.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index 9e62cc500..40cc106ae 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -919,6 +919,15 @@ xfs_droplink(
>  	xfs_trans_t *tp,
>  	xfs_inode_t *ip)
>  {
> +
> +	if (VFS_I(ip)->i_nlink == 0) {
> +		xfs_alert(ip->i_mount,
> +			  "%s: Deleting inode %llu with no links.",
> +			  __func__, ip->i_ino);
> +		tp->t_flags |= XFS_TRANS_DIRTY;

Marking the transaction dirty is not necessary.

Otherwise this seems fine.

-Dave.

-- 
Dave Chinner
david@...morbit.com