don't allow unprivileged passthrough on partitions

[Kanchan Joshi]

On Sun, Jan 08, 2023 at 05:50:30PM +0100, Christoph Hellwig wrote:
>Hi all,
>
>this series fixes ensures that unprivileged passthrough can't be
>used on partitions.

Reviewed-by: Kanchan Joshi <joshi.k at samsung.com>