[PATCH] Keys: Allow in-kernel key requestor to pass auxiliary data to upcaller

The proposed NFS key type uses its own method of passing key requests to
userspace (upcalling) rather than invoking /sbin/request-key.  This is
because the responsible userspace daemon should already be running and will
be contacted through rpc_pipefs.

This patch permits the NFS filesystem to pass auxiliary data to the upcall
operation (struct key_type::request_key) so that the upcaller can use a
pre-existing communications channel more easily.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-By: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/key.h b/include/linux/key.h
index e693e729bc92..169f05e4863e 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -177,7 +177,8 @@ struct key {
 /*
  * kernel managed key type definition
  */
-typedef int (*request_key_actor_t)(struct key *key, struct key *authkey, const char *op);
+typedef int (*request_key_actor_t)(struct key *key, struct key *authkey,
+                                   const char *op, void *aux);
 
 struct key_type {
         /* name of the type */
@@ -285,6 +286,11 @@ extern struct key *request_key(struct key_type *type,
                                const char *description,
                                const char *callout_info);
 
+extern struct key *request_key_with_auxdata(struct key_type *type,
+                                            const char *description,
+                                            const char *callout_info,
+                                            void *aux);
+
 extern int key_validate(struct key *key);
 
 extern key_ref_t key_create_or_update(key_ref_t keyring,