From: Andy Adamson <andros@umich.edu>
Date: Fri, 18 May 2007 16:52:42 -0400
NFSv4: Obtain an RPC credential for NFS4ERR_WRONGSEC handler

Helper function for WRONGSEC handler

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

 fs/nfs/client.c  |   21 +++++++++++++++++++++
 fs/nfs/nfs4_fs.h |    2 ++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index eb03f5f..ec7290c 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1131,6 +1131,27 @@ out:
 	return ret;
 }
 
+static int nfs4_set_ex_cred(struct nfs4_exception *exc, rpc_authflavor_t flavor)
+{
+	struct rpc_auth *auth;
+	int error = 0;
+
+	dprintk("--> nfs4_set_ex_cred: flavor %d\n", flavor);
+
+	auth = rpcauth_create(flavor, exc->ex_clnt);
+	if (IS_ERR(auth)) {
+		dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
+		return PTR_ERR(auth);
+	}
+	exc->ex_cred = rpcauth_lookupcred(exc->ex_clnt->cl_auth, 0);
+	if (IS_ERR(exc->ex_cred)) {
+		error = PTR_ERR(exc->ex_cred);
+		exc->ex_cred = NULL;
+	}
+	dprintk("<-- nfs4_set_ex_cred %d\n", error);
+	return error;
+}
+
 #endif /* CONFIG_NFS_V4 */
 
 /*
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 9215b66..e63fb05 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -144,6 +144,8 @@ struct nfs4_exception {
 	long timeout;
 	int retry;
 	struct nfs4_secinfo_res *ex_list;
+	struct rpc_clnt *ex_clnt;
+	struct rpc_cred *ex_cred;
 };
 
 struct nfs4_state_recovery_ops {