13 files changed, 34 insertions, 10 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index 30738d200866..f815218f92d3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2672,6 +2672,7 @@ static struct mnt_namespace *alloc_mnt_ns(struct user_namespace *user_ns)
                 kfree(new_ns);
                 return ERR_PTR(ret);
         }
+        new_ns->ns.ops = &mntns_operations;
         new_ns->seq = atomic64_add_return(1, &mnt_ns_seq);
         atomic_set(&new_ns->count, 1);
         new_ns->root = NULL;
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 43b703c6cd3b..a212996e0987 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -32,7 +32,6 @@ static void proc_evict_inode(struct inode *inode)
 {
         struct proc_dir_entry *de;
         struct ctl_table_header *head;
-        const struct proc_ns_operations *ns_ops;
         struct ns_common *ns;
 
         truncate_inode_pages_final(&inode->i_data);
@@ -51,10 +50,9 @@ static void proc_evict_inode(struct inode *inode)
                 sysctl_head_put(head);
         }
         /* Release any associated namespace */
-        ns_ops = PROC_I(inode)->ns.ns_ops;
         ns = PROC_I(inode)->ns.ns;
-        if (ns_ops && ns)
-                ns_ops->put(ns);
+        if (ns && ns->ops)
+                ns->ops->put(ns);
 }
 
 static struct kmem_cache * proc_inode_cachep;
diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h
index e7db1cd54047..ce23cf4bbe69 100644
--- a/include/linux/ns_common.h
+++ b/include/linux/ns_common.h
@@ -1,7 +1,10 @@
 #ifndef _LINUX_NS_COMMON_H
 #define _LINUX_NS_COMMON_H
 
+struct proc_ns_operations;
+
 struct ns_common {
+        const struct proc_ns_operations *ops;
         unsigned int inum;
 };
 
diff --git a/init/version.c b/init/version.c
index e23dbdabb26b..fe41a63efed6 100644
--- a/init/version.c
+++ b/init/version.c
@@ -36,6 +36,9 @@ struct uts_namespace init_uts_ns = {
         },
         .user_ns = &init_user_ns,
         .ns.inum = PROC_UTS_INIT_INO,
+#ifdef CONFIG_UTS_NS
+        .ns.ops = &utsns_operations,
+#endif
 };
 EXPORT_SYMBOL_GPL(init_uts_ns);
 
diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index 5930471a2902..2b491590ebab 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -32,6 +32,9 @@ struct ipc_namespace init_ipc_ns = {
         .count          = ATOMIC_INIT(1),
         .user_ns = &init_user_ns,
         .ns.inum = PROC_IPC_INIT_INO,
+#ifdef CONFIG_IPC_NS
+        .ns.ops = &ipcns_operations,
+#endif
 };
 
 atomic_t nr_ipc_ns = ATOMIC_INIT(1);
diff --git a/ipc/namespace.c b/ipc/namespace.c
index bcdd7a5c122a..382e2aa42d8a 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -31,6 +31,7 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
                 kfree(ns);
                 return ERR_PTR(err);
         }
+        ns->ns.ops = &ipcns_operations;
 
         atomic_set(&ns->count, 1);
         err = mq_init_ns(ns);
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index ef42d0ab3115..87c37221cb7f 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -220,11 +220,11 @@ void exit_task_namespaces(struct task_struct *p)
 
 SYSCALL_DEFINE2(setns, int, fd, int, nstype)
 {
-        const struct proc_ns_operations *ops;
         struct task_struct *tsk = current;
         struct nsproxy *new_nsproxy;
         struct proc_ns *ei;
         struct file *file;
+        struct ns_common *ns;
         int err;
 
         file = proc_ns_fget(fd);
@@ -233,8 +233,8 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
 
         err = -EINVAL;
         ei = get_proc_ns(file_inode(file));
-        ops = ei->ns_ops;
-        if (nstype && (ops->type != nstype))
+        ns = ei->ns;
+        if (nstype && (ns->ops->type != nstype))
                 goto out;
 
         new_nsproxy = create_new_namespaces(0, tsk, current_user_ns(), tsk->fs);
@@ -243,7 +243,7 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
                 goto out;
         }
 
-        err = ops->install(new_nsproxy, ei->ns);
+        err = ns->ops->install(new_nsproxy, ns);
         if (err) {
                 free_nsproxy(new_nsproxy);
                 goto out;
diff --git a/kernel/pid.c b/kernel/pid.c
index 3650698cf1dc..c17a993a4d2a 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -80,6 +80,9 @@ struct pid_namespace init_pid_ns = {
         .child_reaper = &init_task,
         .user_ns = &init_user_ns,
         .ns.inum = PROC_PID_INIT_INO,
+#ifdef CONFIG_PID_NS
+        .ns.ops = &pidns_operations,
+#endif
 };
 EXPORT_SYMBOL_GPL(init_pid_ns);
 
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 5aa9158a84d5..e1bafe3b47bb 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -108,6 +108,7 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
         err = ns_alloc_inum(&ns->ns);
         if (err)
                 goto out_free_map;
+        ns->ns.ops = &pidns_operations;
 
         kref_init(&ns->kref);
         ns->level = level;
diff --git a/kernel/user.c b/kernel/user.c
index a7ca84bad8e6..69b800aebf13 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -51,6 +51,9 @@ struct user_namespace init_user_ns = {
         .owner = GLOBAL_ROOT_UID,
         .group = GLOBAL_ROOT_GID,
         .ns.inum = PROC_USER_INIT_INO,
+#ifdef CONFIG_USER_NS
+        .ns.ops = &userns_operations,
+#endif
 #ifdef CONFIG_PERSISTENT_KEYRINGS
         .persistent_keyring_register_sem =
         __RWSEM_INITIALIZER(init_user_ns.persistent_keyring_register_sem),
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 6bf8177768e5..1491ad00388f 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -91,6 +91,7 @@ int create_user_ns(struct cred *new)
                 kmem_cache_free(user_ns_cachep, ns);
                 return ret;
         }
+        ns->ns.ops = &userns_operations;
 
         atomic_set(&ns->count, 1);
         /* Leave the new->user_ns reference with the new user namespace. */
diff --git a/kernel/utsname.c b/kernel/utsname.c
index c2a2b321d88a..831ea7108232 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -48,6 +48,8 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
                 return ERR_PTR(err);
         }
 
+        ns->ns.ops = &utsns_operations;
+
         down_read(&uts_sem);
         memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
         ns->user_ns = get_user_ns(user_ns);
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index da775f53f3fd..4d4acaf7b498 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -339,6 +339,7 @@ struct net *get_net_ns_by_fd(int fd)
 {
         struct proc_ns *ei;
         struct file *file;
+        struct ns_common *ns;
         struct net *net;
 
         file = proc_ns_fget(fd);
@@ -346,8 +347,9 @@ struct net *get_net_ns_by_fd(int fd)
                 return ERR_CAST(file);
 
         ei = get_proc_ns(file_inode(file));
-        if (ei->ns_ops == &netns_operations)
-                net = get_net(container_of(ei->ns, struct net, ns));
+        ns = ei->ns;
+        if (ns->ops == &netns_operations)
+                net = get_net(container_of(ns, struct net, ns));
         else
                 net = ERR_PTR(-EINVAL);
 
@@ -386,6 +388,9 @@ EXPORT_SYMBOL_GPL(get_net_ns_by_pid);
 
 static __net_init int net_ns_net_init(struct net *net)
 {
+#ifdef CONFIG_NET_NS
+        net->ns.ops = &netns_operations;
+#endif
         return ns_alloc_inum(&net->ns);
 }