NFSv4: Reintroduce machine creds

We need to try to ensure that we always use the same credentials whenever
we re-establish the clientid on the server. If not, the server won't
recognise that we're the same client, and so may not allow us to recover
state.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index ac7e4fb943ea..c9beacd16c00 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -32,6 +32,8 @@ struct nfs_client {
         const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
         int                     cl_proto;       /* Network transport protocol */
 
+        struct rpc_cred         *cl_machine_cred;
+
 #ifdef CONFIG_NFS_V4
         u64                     cl_clientid;    /* constant */
         nfs4_verifier           cl_confirm;
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index a19c3af933ca..3f632182d8eb 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -26,6 +26,7 @@ struct auth_cred {
         uid_t   uid;
         gid_t   gid;
         struct group_info *group_info;
+        unsigned char machine_cred : 1;
 };
 
 /*
@@ -130,6 +131,7 @@ void __exit		rpcauth_remove_module(void);
 void __exit             rpc_destroy_generic_auth(void);
 
 struct rpc_cred *       rpc_lookup_cred(void);
+struct rpc_cred *       rpc_lookup_machine_cred(void);
 int                     rpcauth_register(const struct rpc_authops *);
 int                     rpcauth_unregister(const struct rpc_authops *);
 struct rpc_auth *       rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
diff --git a/include/linux/sunrpc/auth_gss.h b/include/linux/sunrpc/auth_gss.h
index 67658e17a375..fec6899bf355 100644
--- a/include/linux/sunrpc/auth_gss.h
+++ b/include/linux/sunrpc/auth_gss.h
@@ -84,6 +84,7 @@ struct gss_cred {
         enum rpc_gss_svc        gc_service;
         struct gss_cl_ctx       *gc_ctx;
         struct gss_upcall_msg   *gc_upcall;
+        unsigned char           gc_machine_cred : 1;
 };
 
 #endif /* __KERNEL__ */