NFS: Try AUTH_UNIX when PUTROOTFH gets NFS4ERR_WRONGSEC

Most NFSv4 servers implement AUTH_UNIX, and administrators will
prefer this over AUTH_NULL.  It is harmless for our client to try
this flavor in addition to the flavors mandated by RFC 3530/5661.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index dd3a43792df0..a8e6d802383b 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2531,6 +2531,7 @@ static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
                 RPC_AUTH_GSS_KRB5P,
                 RPC_AUTH_GSS_KRB5I,
                 RPC_AUTH_GSS_KRB5,
+                RPC_AUTH_UNIX,                  /* courtesy */
                 RPC_AUTH_NULL,
         };
         int status = -EPERM;