5 files changed, 92 insertions, 10 deletions

diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index 7874a8a56638..492a36d72829 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -99,6 +99,8 @@ struct rpc_authops {
 
         struct rpc_cred *       (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
         struct rpc_cred *       (*crcreate)(struct rpc_auth*, struct auth_cred *, int);
+        int                     (*pipes_create)(struct rpc_auth *);
+        void                    (*pipes_destroy)(struct rpc_auth *);
 };
 
 struct rpc_credops {
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 1a6fa9173519..9da2d837b512 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -762,8 +762,10 @@ static void gss_pipes_dentries_destroy(struct rpc_auth *auth)
         struct gss_auth *gss_auth;
 
         gss_auth = container_of(auth, struct gss_auth, rpc_auth);
-        rpc_unlink(gss_auth->pipe[0]->dentry);
-        rpc_unlink(gss_auth->pipe[1]->dentry);
+        if (gss_auth->pipe[0]->dentry)
+                rpc_unlink(gss_auth->pipe[0]->dentry);
+        if (gss_auth->pipe[1]->dentry)
+                rpc_unlink(gss_auth->pipe[1]->dentry);
 }
 
 static int gss_pipes_dentries_create(struct rpc_auth *auth)
@@ -1614,7 +1616,9 @@ static const struct rpc_authops authgss_ops = {
         .create         = gss_create,
         .destroy        = gss_destroy,
         .lookup_cred    = gss_lookup_cred,
-        .crcreate       = gss_create_cred
+        .crcreate       = gss_create_cred,
+        .pipes_create   = gss_pipes_dentries_create,
+        .pipes_destroy  = gss_pipes_dentries_destroy,
 };
 
 static const struct rpc_credops gss_credops = {
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 90e82c5daeb6..417074500592 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -98,8 +98,11 @@ static void rpc_unregister_client(struct rpc_clnt *clnt)
 
 static void __rpc_clnt_remove_pipedir(struct rpc_clnt *clnt)
 {
-        if (clnt->cl_path.dentry)
+        if (clnt->cl_path.dentry) {
+                if (clnt->cl_auth && clnt->cl_auth->au_ops->pipes_destroy)
+                        clnt->cl_auth->au_ops->pipes_destroy(clnt->cl_auth);
                 rpc_remove_client_dir(clnt->cl_path.dentry);
+        }
         clnt->cl_path.dentry = NULL;
 }
 
@@ -181,6 +184,70 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
         return 0;
 }
 
+static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
+                                struct super_block *sb)
+{
+        struct dentry *dentry;
+        int err = 0;
+
+        switch (event) {
+        case RPC_PIPEFS_MOUNT:
+                if (clnt->cl_program->pipe_dir_name == NULL)
+                        break;
+                dentry = rpc_setup_pipedir_sb(sb, clnt,
+                                              clnt->cl_program->pipe_dir_name);
+                BUG_ON(dentry == NULL);
+                if (IS_ERR(dentry))
+                        return PTR_ERR(dentry);
+                clnt->cl_path.dentry = dentry;
+                if (clnt->cl_auth->au_ops->pipes_create) {
+                        err = clnt->cl_auth->au_ops->pipes_create(clnt->cl_auth);
+                        if (err)
+                                __rpc_clnt_remove_pipedir(clnt);
+                }
+                break;
+        case RPC_PIPEFS_UMOUNT:
+                __rpc_clnt_remove_pipedir(clnt);
+                break;
+        default:
+                printk(KERN_ERR "%s: unknown event: %ld\n", __func__, event);
+                return -ENOTSUPP;
+        }
+        return err;
+}
+
+static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
+                            void *ptr)
+{
+        struct super_block *sb = ptr;
+        struct rpc_clnt *clnt;
+        int error = 0;
+        struct sunrpc_net *sn = net_generic(sb->s_fs_info, sunrpc_net_id);
+
+        spin_lock(&sn->rpc_client_lock);
+        list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+                error = __rpc_pipefs_event(clnt, event, sb);
+                if (error)
+                        break;
+        }
+        spin_unlock(&sn->rpc_client_lock);
+        return error;
+}
+
+static struct notifier_block rpc_clients_block = {
+        .notifier_call  = rpc_pipefs_event,
+};
+
+int rpc_clients_notifier_register(void)
+{
+        return rpc_pipefs_notifier_register(&rpc_clients_block);
+}
+
+void rpc_clients_notifier_unregister(void)
+{
+        return rpc_pipefs_notifier_unregister(&rpc_clients_block);
+}
+
 static struct rpc_clnt * rpc_new_client(const struct rpc_create_args *args, struct rpc_xprt *xprt)
 {
         struct rpc_program      *program = args->program;
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 6dd8b96e8df7..910de4169a8d 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -937,7 +937,7 @@ struct dentry *rpc_create_client_dir(struct dentry *dentry,
 
 /**
  * rpc_remove_client_dir - Remove a directory created with rpc_create_client_dir()
- * @dentry: directory to remove
+ * @clnt: rpc client
  */
 int rpc_remove_client_dir(struct dentry *dentry)
 {
@@ -1188,17 +1188,24 @@ int register_rpc_pipefs(void)
                                 init_once);
         if (!rpc_inode_cachep)
                 return -ENOMEM;
+        err = rpc_clients_notifier_register();
+        if (err)
+                goto err_notifier;
         err = register_filesystem(&rpc_pipe_fs_type);
-        if (err) {
-                kmem_cache_destroy(rpc_inode_cachep);
-                return err;
-        }
-
+        if (err)
+                goto err_register;
         return 0;
+
+err_register:
+        rpc_clients_notifier_unregister();
+err_notifier:
+        kmem_cache_destroy(rpc_inode_cachep);
+        return err;
 }
 
 void unregister_rpc_pipefs(void)
 {
+        rpc_clients_notifier_unregister();
         kmem_cache_destroy(rpc_inode_cachep);
         unregister_filesystem(&rpc_pipe_fs_type);
 }
diff --git a/net/sunrpc/sunrpc.h b/net/sunrpc/sunrpc.h
index 90c292e2738b..14c9f6d1c5ff 100644
--- a/net/sunrpc/sunrpc.h
+++ b/net/sunrpc/sunrpc.h
@@ -47,5 +47,7 @@ int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
                     struct page *headpage, unsigned long headoffset,
                     struct page *tailpage, unsigned long tailoffset);
 
+int rpc_clients_notifier_register(void);
+void rpc_clients_notifier_unregister(void);
 #endif /* _NET_SUNRPC_SUNRPC_H */