1 files changed, 633 insertions, 14 deletions

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 0b3e875d1abd..4767429264a2 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -1,5 +1,6 @@
 /*
 *  Copyright (c) 2004 The Regents of the University of Michigan.
+*  Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
 *  All rights reserved.
 *
 *  Andy Adamson <andros@citi.umich.edu>
@@ -36,16 +37,34 @@
 #include <linux/namei.h>
 #include <linux/crypto.h>
 #include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <net/net_namespace.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfsd/cld.h>
 
 #include "nfsd.h"
 #include "state.h"
 #include "vfs.h"
+#include "netns.h"
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
+/* Declarations */
+struct nfsd4_client_tracking_ops {
+        int (*init)(struct net *);
+        void (*exit)(struct net *);
+        void (*create)(struct nfs4_client *);
+        void (*remove)(struct nfs4_client *);
+        int (*check)(struct nfs4_client *);
+        void (*grace_done)(struct net *, time_t);
+};
+
 /* Globals */
 static struct file *rec_file;
 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
+static struct nfsd4_client_tracking_ops *client_tracking_ops;
 
 static int
 nfs4_save_creds(const struct cred **original_creds)
@@ -117,7 +136,8 @@ out_no_tfm:
         return status;
 }
 
-void nfsd4_create_clid_dir(struct nfs4_client *clp)
+static void
+nfsd4_create_clid_dir(struct nfs4_client *clp)
 {
         const struct cred *original_cred;
         char *dname = clp->cl_recdir;
@@ -126,9 +146,8 @@ void nfsd4_create_clid_dir(struct nfs4_client *clp)
 
         dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
 
-        if (clp->cl_firststate)
+        if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
                 return;
-        clp->cl_firststate = 1;
         if (!rec_file)
                 return;
         status = nfs4_save_creds(&original_cred);
@@ -265,19 +284,19 @@ out_unlock:
         return status;
 }
 
-void
+static void
 nfsd4_remove_clid_dir(struct nfs4_client *clp)
 {
         const struct cred *original_cred;
         int status;
 
-        if (!rec_file || !clp->cl_firststate)
+        if (!rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
                 return;
 
         status = mnt_want_write_file(rec_file);
         if (status)
                 goto out;
-        clp->cl_firststate = 0;
+        clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
 
         status = nfs4_save_creds(&original_cred);
         if (status < 0)
@@ -292,7 +311,6 @@ out:
         if (status)
                 printk("NFSD: Failed to remove expired client state directory"
                                 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
-        return;
 }
 
 static int
@@ -311,8 +329,9 @@ purge_old(struct dentry *parent, struct dentry *child)
         return 0;
 }
 
-void
-nfsd4_recdir_purge_old(void) {
+static void
+nfsd4_recdir_purge_old(struct net *net, time_t boot_time)
+{
         int status;
 
         if (!rec_file)
@@ -343,7 +362,7 @@ load_recdir(struct dentry *parent, struct dentry *child)
         return 0;
 }
 
-int
+static int
 nfsd4_recdir_load(void) {
         int status;
 
@@ -361,8 +380,8 @@ nfsd4_recdir_load(void) {
  * Hold reference to the recovery directory.
  */
 
-void
-nfsd4_init_recdir()
+static int
+nfsd4_init_recdir(void)
 {
         const struct cred *original_cred;
         int status;
@@ -377,20 +396,44 @@ nfsd4_init_recdir()
                 printk("NFSD: Unable to change credentials to find recovery"
                        " directory: error %d\n",
                        status);
-                return;
+                return status;
         }
 
         rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
         if (IS_ERR(rec_file)) {
                 printk("NFSD: unable to find recovery directory %s\n",
                                 user_recovery_dirname);
+                status = PTR_ERR(rec_file);
                 rec_file = NULL;
         }
 
         nfs4_reset_creds(original_cred);
+        return status;
 }
 
-void
+static int
+nfsd4_load_reboot_recovery_data(struct net *net)
+{
+        int status;
+
+        /* XXX: The legacy code won't work in a container */
+        if (net != &init_net) {
+                WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
+                        "tracking in a container!\n");
+                return -EINVAL;
+        }
+
+        nfs4_lock_state();
+        status = nfsd4_init_recdir();
+        if (!status)
+                status = nfsd4_recdir_load();
+        nfs4_unlock_state();
+        if (status)
+                printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
+        return status;
+}
+
+static void
 nfsd4_shutdown_recdir(void)
 {
         if (!rec_file)
@@ -399,6 +442,13 @@ nfsd4_shutdown_recdir(void)
         rec_file = NULL;
 }
 
+static void
+nfsd4_legacy_tracking_exit(struct net *net)
+{
+        nfs4_release_reclaim();
+        nfsd4_shutdown_recdir();
+}
+
 /*
  * Change the NFSv4 recovery directory to recdir.
  */
@@ -425,3 +475,572 @@ nfs4_recoverydir(void)
 {
         return user_recovery_dirname;
 }
+
+static int
+nfsd4_check_legacy_client(struct nfs4_client *clp)
+{
+        /* did we already find that this client is stable? */
+        if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+                return 0;
+
+        /* look for it in the reclaim hashtable otherwise */
+        if (nfsd4_find_reclaim_client(clp)) {
+                set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+                return 0;
+        }
+
+        return -ENOENT;
+}
+
+static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
+        .init           = nfsd4_load_reboot_recovery_data,
+        .exit           = nfsd4_legacy_tracking_exit,
+        .create         = nfsd4_create_clid_dir,
+        .remove         = nfsd4_remove_clid_dir,
+        .check          = nfsd4_check_legacy_client,
+        .grace_done     = nfsd4_recdir_purge_old,
+};
+
+/* Globals */
+#define NFSD_PIPE_DIR           "nfsd"
+#define NFSD_CLD_PIPE           "cld"
+
+/* per-net-ns structure for holding cld upcall info */
+struct cld_net {
+        struct rpc_pipe         *cn_pipe;
+        spinlock_t               cn_lock;
+        struct list_head         cn_list;
+        unsigned int             cn_xid;
+};
+
+struct cld_upcall {
+        struct list_head         cu_list;
+        struct cld_net          *cu_net;
+        struct task_struct      *cu_task;
+        struct cld_msg           cu_msg;
+};
+
+static int
+__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
+{
+        int ret;
+        struct rpc_pipe_msg msg;
+
+        memset(&msg, 0, sizeof(msg));
+        msg.data = cmsg;
+        msg.len = sizeof(*cmsg);
+
+        /*
+         * Set task state before we queue the upcall. That prevents
+         * wake_up_process in the downcall from racing with schedule.
+         */
+        set_current_state(TASK_UNINTERRUPTIBLE);
+        ret = rpc_queue_upcall(pipe, &msg);
+        if (ret < 0) {
+                set_current_state(TASK_RUNNING);
+                goto out;
+        }
+
+        schedule();
+        set_current_state(TASK_RUNNING);
+
+        if (msg.errno < 0)
+                ret = msg.errno;
+out:
+        return ret;
+}
+
+static int
+cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
+{
+        int ret;
+
+        /*
+         * -EAGAIN occurs when pipe is closed and reopened while there are
+         *  upcalls queued.
+         */
+        do {
+                ret = __cld_pipe_upcall(pipe, cmsg);
+        } while (ret == -EAGAIN);
+
+        return ret;
+}
+
+static ssize_t
+cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
+{
+        struct cld_upcall *tmp, *cup;
+        struct cld_msg *cmsg = (struct cld_msg *)src;
+        uint32_t xid;
+        struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
+                                                nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+
+        if (mlen != sizeof(*cmsg)) {
+                dprintk("%s: got %lu bytes, expected %lu\n", __func__, mlen,
+                        sizeof(*cmsg));
+                return -EINVAL;
+        }
+
+        /* copy just the xid so we can try to find that */
+        if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
+                dprintk("%s: error when copying xid from userspace", __func__);
+                return -EFAULT;
+        }
+
+        /* walk the list and find corresponding xid */
+        cup = NULL;
+        spin_lock(&cn->cn_lock);
+        list_for_each_entry(tmp, &cn->cn_list, cu_list) {
+                if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
+                        cup = tmp;
+                        list_del_init(&cup->cu_list);
+                        break;
+                }
+        }
+        spin_unlock(&cn->cn_lock);
+
+        /* couldn't find upcall? */
+        if (!cup) {
+                dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
+                return -EINVAL;
+        }
+
+        if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
+                return -EFAULT;
+
+        wake_up_process(cup->cu_task);
+        return mlen;
+}
+
+static void
+cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
+{
+        struct cld_msg *cmsg = msg->data;
+        struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
+                                                 cu_msg);
+
+        /* errno >= 0 means we got a downcall */
+        if (msg->errno >= 0)
+                return;
+
+        wake_up_process(cup->cu_task);
+}
+
+static const struct rpc_pipe_ops cld_upcall_ops = {
+        .upcall         = rpc_pipe_generic_upcall,
+        .downcall       = cld_pipe_downcall,
+        .destroy_msg    = cld_pipe_destroy_msg,
+};
+
+static struct dentry *
+nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
+{
+        struct dentry *dir, *dentry;
+
+        dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
+        if (dir == NULL)
+                return ERR_PTR(-ENOENT);
+        dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
+        dput(dir);
+        return dentry;
+}
+
+static void
+nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
+{
+        if (pipe->dentry)
+                rpc_unlink(pipe->dentry);
+}
+
+static struct dentry *
+nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
+{
+        struct super_block *sb;
+        struct dentry *dentry;
+
+        sb = rpc_get_sb_net(net);
+        if (!sb)
+                return NULL;
+        dentry = nfsd4_cld_register_sb(sb, pipe);
+        rpc_put_sb_net(net);
+        return dentry;
+}
+
+static void
+nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
+{
+        struct super_block *sb;
+
+        sb = rpc_get_sb_net(net);
+        if (sb) {
+                nfsd4_cld_unregister_sb(pipe);
+                rpc_put_sb_net(net);
+        }
+}
+
+/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
+static int
+nfsd4_init_cld_pipe(struct net *net)
+{
+        int ret;
+        struct dentry *dentry;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+        struct cld_net *cn;
+
+        if (nn->cld_net)
+                return 0;
+
+        cn = kzalloc(sizeof(*cn), GFP_KERNEL);
+        if (!cn) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
+        if (IS_ERR(cn->cn_pipe)) {
+                ret = PTR_ERR(cn->cn_pipe);
+                goto err;
+        }
+        spin_lock_init(&cn->cn_lock);
+        INIT_LIST_HEAD(&cn->cn_list);
+
+        dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
+        if (IS_ERR(dentry)) {
+                ret = PTR_ERR(dentry);
+                goto err_destroy_data;
+        }
+
+        cn->cn_pipe->dentry = dentry;
+        nn->cld_net = cn;
+        return 0;
+
+err_destroy_data:
+        rpc_destroy_pipe_data(cn->cn_pipe);
+err:
+        kfree(cn);
+        printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
+                        ret);
+        return ret;
+}
+
+static void
+nfsd4_remove_cld_pipe(struct net *net)
+{
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+
+        nfsd4_cld_unregister_net(net, cn->cn_pipe);
+        rpc_destroy_pipe_data(cn->cn_pipe);
+        kfree(nn->cld_net);
+        nn->cld_net = NULL;
+}
+
+static struct cld_upcall *
+alloc_cld_upcall(struct cld_net *cn)
+{
+        struct cld_upcall *new, *tmp;
+
+        new = kzalloc(sizeof(*new), GFP_KERNEL);
+        if (!new)
+                return new;
+
+        /* FIXME: hard cap on number in flight? */
+restart_search:
+        spin_lock(&cn->cn_lock);
+        list_for_each_entry(tmp, &cn->cn_list, cu_list) {
+                if (tmp->cu_msg.cm_xid == cn->cn_xid) {
+                        cn->cn_xid++;
+                        spin_unlock(&cn->cn_lock);
+                        goto restart_search;
+                }
+        }
+        new->cu_task = current;
+        new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
+        put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
+        new->cu_net = cn;
+        list_add(&new->cu_list, &cn->cn_list);
+        spin_unlock(&cn->cn_lock);
+
+        dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
+
+        return new;
+}
+
+static void
+free_cld_upcall(struct cld_upcall *victim)
+{
+        struct cld_net *cn = victim->cu_net;
+
+        spin_lock(&cn->cn_lock);
+        list_del(&victim->cu_list);
+        spin_unlock(&cn->cn_lock);
+        kfree(victim);
+}
+
+/* Ask daemon to create a new record */
+static void
+nfsd4_cld_create(struct nfs4_client *clp)
+{
+        int ret;
+        struct cld_upcall *cup;
+        /* FIXME: determine net from clp */
+        struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+
+        /* Don't upcall if it's already stored */
+        if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+                return;
+
+        cup = alloc_cld_upcall(cn);
+        if (!cup) {
+                ret = -ENOMEM;
+                goto out_err;
+        }
+
+        cup->cu_msg.cm_cmd = Cld_Create;
+        cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
+        memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
+                        clp->cl_name.len);
+
+        ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
+        if (!ret) {
+                ret = cup->cu_msg.cm_status;
+                set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+        }
+
+        free_cld_upcall(cup);
+out_err:
+        if (ret)
+                printk(KERN_ERR "NFSD: Unable to create client "
+                                "record on stable storage: %d\n", ret);
+}
+
+/* Ask daemon to create a new record */
+static void
+nfsd4_cld_remove(struct nfs4_client *clp)
+{
+        int ret;
+        struct cld_upcall *cup;
+        /* FIXME: determine net from clp */
+        struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+
+        /* Don't upcall if it's already removed */
+        if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+                return;
+
+        cup = alloc_cld_upcall(cn);
+        if (!cup) {
+                ret = -ENOMEM;
+                goto out_err;
+        }
+
+        cup->cu_msg.cm_cmd = Cld_Remove;
+        cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
+        memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
+                        clp->cl_name.len);
+
+        ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
+        if (!ret) {
+                ret = cup->cu_msg.cm_status;
+                clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+        }
+
+        free_cld_upcall(cup);
+out_err:
+        if (ret)
+                printk(KERN_ERR "NFSD: Unable to remove client "
+                                "record from stable storage: %d\n", ret);
+}
+
+/* Check for presence of a record, and update its timestamp */
+static int
+nfsd4_cld_check(struct nfs4_client *clp)
+{
+        int ret;
+        struct cld_upcall *cup;
+        /* FIXME: determine net from clp */
+        struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+
+        /* Don't upcall if one was already stored during this grace pd */
+        if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+                return 0;
+
+        cup = alloc_cld_upcall(cn);
+        if (!cup) {
+                printk(KERN_ERR "NFSD: Unable to check client record on "
+                                "stable storage: %d\n", -ENOMEM);
+                return -ENOMEM;
+        }
+
+        cup->cu_msg.cm_cmd = Cld_Check;
+        cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
+        memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
+                        clp->cl_name.len);
+
+        ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
+        if (!ret) {
+                ret = cup->cu_msg.cm_status;
+                set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+        }
+
+        free_cld_upcall(cup);
+        return ret;
+}
+
+static void
+nfsd4_cld_grace_done(struct net *net, time_t boot_time)
+{
+        int ret;
+        struct cld_upcall *cup;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+
+        cup = alloc_cld_upcall(cn);
+        if (!cup) {
+                ret = -ENOMEM;
+                goto out_err;
+        }
+
+        cup->cu_msg.cm_cmd = Cld_GraceDone;
+        cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
+        ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
+        if (!ret)
+                ret = cup->cu_msg.cm_status;
+
+        free_cld_upcall(cup);
+out_err:
+        if (ret)
+                printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
+}
+
+static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
+        .init           = nfsd4_init_cld_pipe,
+        .exit           = nfsd4_remove_cld_pipe,
+        .create         = nfsd4_cld_create,
+        .remove         = nfsd4_cld_remove,
+        .check          = nfsd4_cld_check,
+        .grace_done     = nfsd4_cld_grace_done,
+};
+
+int
+nfsd4_client_tracking_init(struct net *net)
+{
+        int status;
+        struct path path;
+
+        if (!client_tracking_ops) {
+                client_tracking_ops = &nfsd4_cld_tracking_ops;
+                status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
+                if (!status) {
+                        if (S_ISDIR(path.dentry->d_inode->i_mode))
+                                client_tracking_ops =
+                                                &nfsd4_legacy_tracking_ops;
+                        path_put(&path);
+                }
+        }
+
+        status = client_tracking_ops->init(net);
+        if (status) {
+                printk(KERN_WARNING "NFSD: Unable to initialize client "
+                                    "recovery tracking! (%d)\n", status);
+                client_tracking_ops = NULL;
+        }
+        return status;
+}
+
+void
+nfsd4_client_tracking_exit(struct net *net)
+{
+        if (client_tracking_ops) {
+                client_tracking_ops->exit(net);
+                client_tracking_ops = NULL;
+        }
+}
+
+void
+nfsd4_client_record_create(struct nfs4_client *clp)
+{
+        if (client_tracking_ops)
+                client_tracking_ops->create(clp);
+}
+
+void
+nfsd4_client_record_remove(struct nfs4_client *clp)
+{
+        if (client_tracking_ops)
+                client_tracking_ops->remove(clp);
+}
+
+int
+nfsd4_client_record_check(struct nfs4_client *clp)
+{
+        if (client_tracking_ops)
+                return client_tracking_ops->check(clp);
+
+        return -EOPNOTSUPP;
+}
+
+void
+nfsd4_record_grace_done(struct net *net, time_t boot_time)
+{
+        if (client_tracking_ops)
+                client_tracking_ops->grace_done(net, boot_time);
+}
+
+static int
+rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
+{
+        struct super_block *sb = ptr;
+        struct net *net = sb->s_fs_info;
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+        struct cld_net *cn = nn->cld_net;
+        struct dentry *dentry;
+        int ret = 0;
+
+        if (!try_module_get(THIS_MODULE))
+                return 0;
+
+        if (!cn) {
+                module_put(THIS_MODULE);
+                return 0;
+        }
+
+        switch (event) {
+        case RPC_PIPEFS_MOUNT:
+                dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
+                if (IS_ERR(dentry)) {
+                        ret = PTR_ERR(dentry);
+                        break;
+                }
+                cn->cn_pipe->dentry = dentry;
+                break;
+        case RPC_PIPEFS_UMOUNT:
+                if (cn->cn_pipe->dentry)
+                        nfsd4_cld_unregister_sb(cn->cn_pipe);
+                break;
+        default:
+                ret = -ENOTSUPP;
+                break;
+        }
+        module_put(THIS_MODULE);
+        return ret;
+}
+
+struct notifier_block nfsd4_cld_block = {
+        .notifier_call = rpc_pipefs_event,
+};
+
+int
+register_cld_notifier(void)
+{
+        return rpc_pipefs_notifier_register(&nfsd4_cld_block);
+}
+
+void
+unregister_cld_notifier(void)
+{
+        rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
+}