NFSv4: Attempt to use machine credentials in SETCLIENTID calls

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

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 7775435ea7a5c859d49d43bef668550967f9a173..46eb624e4f167d0f14189313655971a623f314b5 100644 (file)
--- 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;