NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred().

When NFS creates a machine credential, it is a "generic" credential,
not tied to any auth protocol, and is really just a container for
the princpal name.
This doesn't get linked to a genuine credential until rpcauth_bindcred()
is called.
The lookup always succeeds, so various places that test if the machine
credential is NULL, are pointless.

As a step towards getting rid of generic credentials, this patch gets
rid of generic machine credentials.  The nfs_client and rpc_client
just hold a pointer to a constant principal name.
When a machine credential is wanted, a special static 'struct rpc_cred'
pointer is used. rpcauth_bindcred() recognizes this, finds the
principal from the client, and binds the correct credential.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 0 insertions, 21 deletions

diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index 7d1a8f45726c..5f7aa6324b78 100644
--- a/net/sunrpc/auth_generic.c
+++ b/net/sunrpc/auth_generic.c
@@ -48,27 +48,6 @@ struct rpc_cred *rpc_lookup_cred_nonblock(void)
 }
 EXPORT_SYMBOL_GPL(rpc_lookup_cred_nonblock);
 
-/*
- * Public call interface for looking up machine creds.
- * Note that if service_name is NULL, we actually look up
- * "root" credential.
- */
-struct rpc_cred *rpc_lookup_machine_cred(const char *service_name)
-{
-	struct auth_cred acred = {
-		.principal = service_name,
-		.cred = get_task_cred(&init_task),
-	};
-	struct rpc_cred *ret;
-
-	dprintk("RPC:       looking up machine cred for service %s\n",
-			service_name);
-	ret = generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);
-	put_cred(acred.cred);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred);
-
 static struct rpc_cred *generic_bind_cred(struct rpc_task *task,
 		struct rpc_cred *cred, int lookupflags)
 {