Re: [PATCH 14/16] mm, swap: refactor swapoff + add xswap_destroy

[Youngjun Park]

On Thu, Aug 27, 2026 at 05:45:04PM +0800, Baoquan He wrote:
> +/* Tear down a file-less xswap device by its swap type. */
> +static int xswap_destroy(int type)
> +{
> +	struct swap_info_struct *p;
> +
> +	p = swap_type_to_info(type);
> +	if (!p)
> +		return -EINVAL;
> +
> +	spin_lock(&swap_lock);
> +	if (!(p->flags & SWP_WRITEOK) || !(p->flags & SWP_XSWAP)) {
> +		spin_unlock(&swap_lock);
> +		return -EINVAL;
> +	}
> +	/* Refuse swapoff while the device is pinned for hibernation */
> +	if (p->flags & SWP_HIBERNATION) {
> +		spin_unlock(&swap_lock);
> +		return -EBUSY;
> +	}

non-blockfile swap device must not be chosen for Hibernation.
There is no space to hibernate.

Thanks
Youngjun