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>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 93dfd75aba7c..f2f3b284e6dd 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -112,6 +112,7 @@ struct nfs_client_initdata {
 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
 {
         struct nfs_client *clp;
+        struct rpc_cred *cred;
 
         if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
                 goto error_0;
@@ -150,6 +151,9 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
         clp->cl_boot_time = CURRENT_TIME;
         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 #endif
+        cred = rpc_lookup_machine_cred();
+        if (!IS_ERR(cred))
+                clp->cl_machine_cred = cred;
 
         return clp;
 
@@ -191,6 +195,9 @@ static void nfs_free_client(struct nfs_client *clp)
         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
                 nfs_callback_down();
 
+        if (clp->cl_machine_cred != NULL)
+                put_rpccred(clp->cl_machine_cred);
+
         kfree(clp->cl_hostname);
         kfree(clp);