[lxc-devel] [PATCH 1/8] kernfs: Add API to generate relative kernfs path

[Tejun Heo]

Hello, Serge.

On Tue, Dec 22, 2015 at 10:23:22PM -0600, serge.hallyn at ubuntu.com wrote:
> @@ -164,18 +286,39 @@ void pr_cont_kernfs_name(struct kernfs_node *kn)
>  void pr_cont_kernfs_path(struct kernfs_node *kn)
>  {
>  	unsigned long flags;
> -	char *p;
> +	char *p = NULL;
> +	int sz1, sz2;
>  
>  	spin_lock_irqsave(&kernfs_rename_lock, flags);
>  
> -	p = kernfs_path_locked(kn, kernfs_pr_cont_buf,
> -			       sizeof(kernfs_pr_cont_buf));
> -	if (p)
> -		pr_cont("%s", p);
> -	else
> -		pr_cont("<name too long>");
> +	sz1 = kernfs_path_from_node_locked(kn, NULL, kernfs_pr_cont_buf,
> +					   sizeof(kernfs_pr_cont_buf));
> +	if (sz1 < 0) {
> +		pr_cont("(error)");
> +		goto out;
> +	}
> +
> +	if (sz1 < sizeof(kernfs_pr_cont_buf)) {
> +		pr_cont("%s", kernfs_pr_cont_buf);
> +		goto out;
> +	}
> +
> +	p = kmalloc(sz1 + 1, GFP_NOFS);

We can't do GFP_NOFS allocation while holding a spinlock and we don't
want to do atomic allocation here either.  I think it'd be best to
keep using the static buffer.

Thanks.

-- 
tejun