1 files changed, 91 insertions, 0 deletions

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index a71d95ecbea9..1c3f13c8e472 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -23,6 +23,97 @@
 static bool nfs4_disable_idmapping = true;
 
 /*
+ * Get a unique NFSv4.0 callback identifier which will be used
+ * by the V4.0 callback service to lookup the nfs_client struct
+ */
+static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
+{
+        int ret = 0;
+        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
+
+        if (clp->rpc_ops->version != 4 || minorversion != 0)
+                return ret;
+retry:
+        if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
+                return -ENOMEM;
+        spin_lock(&nn->nfs_client_lock);
+        ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
+        spin_unlock(&nn->nfs_client_lock);
+        if (ret == -EAGAIN)
+                goto retry;
+        return ret;
+}
+
+#ifdef CONFIG_NFS_V4_1
+static void nfs4_shutdown_session(struct nfs_client *clp)
+{
+        if (nfs4_has_session(clp)) {
+                nfs4_destroy_session(clp->cl_session);
+                nfs4_destroy_clientid(clp);
+        }
+
+}
+#else /* CONFIG_NFS_V4_1 */
+static void nfs4_shutdown_session(struct nfs_client *clp)
+{
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
+{
+        int err;
+        struct nfs_client *clp = nfs_alloc_client(cl_init);
+        if (IS_ERR(clp))
+                return clp;
+
+        err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
+        if (err)
+                goto error;
+
+        spin_lock_init(&clp->cl_lock);
+        INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
+        rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
+        clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
+        clp->cl_minorversion = cl_init->minorversion;
+        clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
+        return clp;
+
+error:
+        kfree(clp);
+        return ERR_PTR(err);
+}
+
+/*
+ * Destroy the NFS4 callback service
+ */
+static void nfs4_destroy_callback(struct nfs_client *clp)
+{
+        if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
+                nfs_callback_down(clp->cl_mvops->minor_version);
+}
+
+static void nfs4_shutdown_client(struct nfs_client *clp)
+{
+        if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
+                nfs4_kill_renewd(clp);
+        nfs4_shutdown_session(clp);
+        nfs4_destroy_callback(clp);
+        if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
+                nfs_idmap_delete(clp);
+
+        rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
+        kfree(clp->cl_serverowner);
+        kfree(clp->cl_serverscope);
+        kfree(clp->cl_implid);
+}
+
+void nfs4_free_client(struct nfs_client *clp)
+{
+        nfs4_shutdown_client(clp);
+        nfs_free_client(clp);
+}
+
+/*
  * Initialize the NFS4 callback service
  */
 static int nfs4_init_callback(struct nfs_client *clp)