NFSv4: Attempt to use machine credentials in SETCLIENTID calls

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

1 files changed, 37 insertions, 4 deletions

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 7775435ea7a..46eb624e4f1 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -71,6 +71,29 @@ static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
         return status;
 }
 
+static struct rpc_cred *nfs4_get_machine_cred(struct nfs_client *clp)
+{
+        struct rpc_cred *cred = NULL;
+
+        spin_lock(&clp->cl_lock);
+        if (clp->cl_machine_cred != NULL)
+                cred = get_rpccred(clp->cl_machine_cred);
+        spin_unlock(&clp->cl_lock);
+        return cred;
+}
+
+static void nfs4_clear_machine_cred(struct nfs_client *clp)
+{
+        struct rpc_cred *cred;
+
+        spin_lock(&clp->cl_lock);
+        cred = clp->cl_machine_cred;
+        clp->cl_machine_cred = NULL;
+        spin_unlock(&clp->cl_lock);
+        if (cred != NULL)
+                put_rpccred(cred);
+}
+
 struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
 {
         struct nfs4_state_owner *sp;
@@ -91,13 +114,18 @@ static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 {
         struct nfs4_state_owner *sp;
         struct rb_node *pos;
+        struct rpc_cred *cred;
 
+        cred = nfs4_get_machine_cred(clp);
+        if (cred != NULL)
+                goto out;
         pos = rb_first(&clp->cl_state_owners);
         if (pos != NULL) {
                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
-                return get_rpccred(sp->so_cred);
+                cred = get_rpccred(sp->so_cred);
         }
-        return NULL;
+out:
+        return cred;
 }
 
 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
@@ -924,10 +952,10 @@ restart_loop:
         if (cred != NULL) {
                 /* Yes there are: try to renew the old lease */
                 status = nfs4_proc_renew(clp, cred);
+                put_rpccred(cred);
                 switch (status) {
                         case 0:
                         case -NFS4ERR_CB_PATH_DOWN:
-                                put_rpccred(cred);
                                 goto out;
                         case -NFS4ERR_STALE_CLIENTID:
                         case -NFS4ERR_LEASE_MOVED:
@@ -936,14 +964,19 @@ restart_loop:
         } else {
                 /* "reboot" to ensure we clear all state on the server */
                 clp->cl_boot_time = CURRENT_TIME;
-                cred = nfs4_get_setclientid_cred(clp);
         }
         /* We're going to have to re-establish a clientid */
         nfs4_state_mark_reclaim(clp);
         status = -ENOENT;
+        cred = nfs4_get_setclientid_cred(clp);
         if (cred != NULL) {
                 status = nfs4_init_client(clp, cred);
                 put_rpccred(cred);
+                /* Handle case where the user hasn't set up machine creds */
+                if (status == -EACCES && cred == clp->cl_machine_cred) {
+                        nfs4_clear_machine_cred(clp);
+                        goto restart_loop;
+                }
         }
         if (status)
                 goto out_error;