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 */