Re: [PATCH 4/4] xfs: ask the dentry cache if it knows the parent of a directory

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

> +	parent = dget_parent(dentry);
> +	if (!parent)
> +		goto out_dput;
> +
> +	if (parent->d_sb != sc->ip->i_mount->m_super) {
> +		dput(parent);
> +		goto out_dput;
> +	}

->d_parent can't point to outside the current sb.