[PATCH v12 05/10] KEYS: Add an optional lookup_restriction hook to key_type

[David Howells]

Mat Martineau <mathew.j.martineau at linux.intel.com> wrote:

> +	/* Look up a keyring access restriction (optional)
> +	 *
> +	 * - The caller must hold a read lock on the key type's semaphore
> +	 * - NULL is a valid return value (meaning the requested restriction
> +	 *   is known but will never block addition of a key)
> +	 * - should return -EINVAL if the restriction is unknown
> +	 */
> +	struct key_restriction *(*lookup_restriction)(const char *params);

I wonder if this can be improved in future to using the rcu read lock instead
of a semaphore.

David
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