common object embedded into various struct ....ns for now - just move corresponding ->proc_inum instances over there Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/mount.h b/fs/mount.h
index f82c628..0ad6f76 100644
--- a/fs/mount.h
+++ b/fs/mount.h

@@ -1,10 +1,11 @@
 #include <linux/mount.h>
 #include <linux/seq_file.h>
 #include <linux/poll.h>
+#include <linux/ns_common.h>
 
 struct mnt_namespace {
 	atomic_t		count;
-	unsigned int		proc_inum;
+	struct ns_common	ns;
 	struct mount *	root;
 	struct list_head	list;
 	struct user_namespace	*user_ns;

diff --git a/fs/namespace.c b/fs/namespace.c
index 5b66b2b..adc2ea2 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c

@@ -2640,7 +2640,7 @@
 
 static void free_mnt_ns(struct mnt_namespace *ns)
 {
-	proc_free_inum(ns->proc_inum);
+	proc_free_inum(ns->ns.inum);
 	put_user_ns(ns->user_ns);
 	kfree(ns);
 }
@@ -2662,7 +2662,7 @@
 	new_ns = kmalloc(sizeof(struct mnt_namespace), GFP_KERNEL);
 	if (!new_ns)
 		return ERR_PTR(-ENOMEM);
-	ret = proc_alloc_inum(&new_ns->proc_inum);
+	ret = proc_alloc_inum(&new_ns->ns.inum);
 	if (ret) {
 		kfree(new_ns);
 		return ERR_PTR(ret);
@@ -3201,7 +3201,7 @@
 static unsigned int mntns_inum(void *ns)
 {
 	struct mnt_namespace *mnt_ns = ns;
-	return mnt_ns->proc_inum;
+	return mnt_ns->ns.inum;
 }
 
 const struct proc_ns_operations mntns_operations = {

diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 35e7eca..52a6401 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h

@@ -6,6 +6,7 @@
 #include <linux/rwsem.h>
 #include <linux/notifier.h>
 #include <linux/nsproxy.h>
+#include <linux/ns_common.h>
 
 /*
  * ipc namespace events
@@ -68,7 +69,7 @@
 	/* user_ns which owns the ipc ns */
 	struct user_namespace *user_ns;
 
-	unsigned int	proc_inum;
+	struct ns_common ns;
 };
 
 extern struct ipc_namespace init_ipc_ns;

diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h
new file mode 100644
index 0000000..e7db1cd
--- /dev/null
+++ b/include/linux/ns_common.h

@@ -0,0 +1,8 @@
+#ifndef _LINUX_NS_COMMON_H
+#define _LINUX_NS_COMMON_H
+
+struct ns_common {
+	unsigned int inum;
+};
+
+#endif

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 1997ffc2..b9cf6c5 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h

@@ -8,6 +8,7 @@
 #include <linux/threads.h>
 #include <linux/nsproxy.h>
 #include <linux/kref.h>
+#include <linux/ns_common.h>
 
 struct pidmap {
        atomic_t nr_free;
@@ -43,7 +44,7 @@
 	kgid_t pid_gid;
 	int hide_pid;
 	int reboot;	/* group exit code if this pidns was rebooted */
-	unsigned int proc_inum;
+	struct ns_common ns;
 };
 
 extern struct pid_namespace init_pid_ns;

diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index e953726..4cf06c1 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h

@@ -3,6 +3,7 @@
 
 #include <linux/kref.h>
 #include <linux/nsproxy.h>
+#include <linux/ns_common.h>
 #include <linux/sched.h>
 #include <linux/err.h>
 
@@ -26,7 +27,7 @@
 	int			level;
 	kuid_t			owner;
 	kgid_t			group;
-	unsigned int		proc_inum;
+	struct ns_common	ns;
 
 	/* Register of per-UID persistent keyrings for this namespace */
 #ifdef CONFIG_PERSISTENT_KEYRINGS

diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 239e277..5093f58 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h

@@ -5,6 +5,7 @@
 #include <linux/sched.h>
 #include <linux/kref.h>
 #include <linux/nsproxy.h>
+#include <linux/ns_common.h>
 #include <linux/err.h>
 #include <uapi/linux/utsname.h>
 
@@ -23,7 +24,7 @@
 	struct kref kref;
 	struct new_utsname name;
 	struct user_namespace *user_ns;
-	unsigned int proc_inum;
+	struct ns_common ns;
 };
 extern struct uts_namespace init_uts_ns;
 

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index e0d6466..2e8756b8 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h

@@ -26,6 +26,7 @@
 #endif
 #include <net/netns/nftables.h>
 #include <net/netns/xfrm.h>
+#include <linux/ns_common.h>
 
 struct user_namespace;
 struct proc_dir_entry;
@@ -60,7 +61,7 @@
 
 	struct user_namespace   *user_ns;	/* Owning user namespace */
 
-	unsigned int		proc_inum;
+	struct ns_common	ns;
 
 	struct proc_dir_entry 	*proc_net;
 	struct proc_dir_entry 	*proc_net_stat;

diff --git a/init/version.c b/init/version.c
index 1a4718e..e23dbda 100644
--- a/init/version.c
+++ b/init/version.c

@@ -35,7 +35,7 @@
 		.domainname	= UTS_DOMAINNAME,
 	},
 	.user_ns = &init_user_ns,
-	.proc_inum = PROC_UTS_INIT_INO,
+	.ns.inum = PROC_UTS_INIT_INO,
 };
 EXPORT_SYMBOL_GPL(init_uts_ns);
 

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index 7e70959..5930471 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c

@@ -31,7 +31,7 @@
 struct ipc_namespace init_ipc_ns = {
 	.count		= ATOMIC_INIT(1),
 	.user_ns = &init_user_ns,
-	.proc_inum = PROC_IPC_INIT_INO,
+	.ns.inum = PROC_IPC_INIT_INO,
 };
 
 atomic_t nr_ipc_ns = ATOMIC_INIT(1);

diff --git a/ipc/namespace.c b/ipc/namespace.c
index b54468e..177fa9d 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c

@@ -26,7 +26,7 @@
 	if (ns == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	err = proc_alloc_inum(&ns->proc_inum);
+	err = proc_alloc_inum(&ns->ns.inum);
 	if (err) {
 		kfree(ns);
 		return ERR_PTR(err);
@@ -35,7 +35,7 @@
 	atomic_set(&ns->count, 1);
 	err = mq_init_ns(ns);
 	if (err) {
-		proc_free_inum(ns->proc_inum);
+		proc_free_inum(ns->ns.inum);
 		kfree(ns);
 		return ERR_PTR(err);
 	}
@@ -119,7 +119,7 @@
 	 */
 	ipcns_notify(IPCNS_REMOVED);
 	put_user_ns(ns->user_ns);
-	proc_free_inum(ns->proc_inum);
+	proc_free_inum(ns->ns.inum);
 	kfree(ns);
 }
 
@@ -186,7 +186,7 @@
 {
 	struct ipc_namespace *ns = vp;
 
-	return ns->proc_inum;
+	return ns->ns.inum;
 }
 
 const struct proc_ns_operations ipcns_operations = {

diff --git a/kernel/pid.c b/kernel/pid.c
index 9b9a266..3650698 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c

@@ -79,7 +79,7 @@
 	.level = 0,
 	.child_reaper = &init_task,
 	.user_ns = &init_user_ns,
-	.proc_inum = PROC_PID_INIT_INO,
+	.ns.inum = PROC_PID_INIT_INO,
 };
 EXPORT_SYMBOL_GPL(init_pid_ns);
 

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index db95d8e..99e27e5 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c

@@ -105,7 +105,7 @@
 	if (ns->pid_cachep == NULL)
 		goto out_free_map;
 
-	err = proc_alloc_inum(&ns->proc_inum);
+	err = proc_alloc_inum(&ns->ns.inum);
 	if (err)
 		goto out_free_map;
 
@@ -142,7 +142,7 @@
 {
 	int i;
 
-	proc_free_inum(ns->proc_inum);
+	proc_free_inum(ns->ns.inum);
 	for (i = 0; i < PIDMAP_ENTRIES; i++)
 		kfree(ns->pidmap[i].page);
 	put_user_ns(ns->user_ns);
@@ -365,7 +365,7 @@
 static unsigned int pidns_inum(void *ns)
 {
 	struct pid_namespace *pid_ns = ns;
-	return pid_ns->proc_inum;
+	return pid_ns->ns.inum;
 }
 
 const struct proc_ns_operations pidns_operations = {

diff --git a/kernel/user.c b/kernel/user.c
index 4efa393..a7ca84b 100644
--- a/kernel/user.c
+++ b/kernel/user.c

@@ -50,7 +50,7 @@
 	.count = ATOMIC_INIT(3),
 	.owner = GLOBAL_ROOT_UID,
 	.group = GLOBAL_ROOT_GID,
-	.proc_inum = PROC_USER_INIT_INO,
+	.ns.inum = PROC_USER_INIT_INO,
 #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 aa312b0..fde5840 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c

@@ -86,7 +86,7 @@
 	if (!ns)
 		return -ENOMEM;
 
-	ret = proc_alloc_inum(&ns->proc_inum);
+	ret = proc_alloc_inum(&ns->ns.inum);
 	if (ret) {
 		kmem_cache_free(user_ns_cachep, ns);
 		return ret;
@@ -136,7 +136,7 @@
 #ifdef CONFIG_PERSISTENT_KEYRINGS
 		key_put(ns->persistent_keyring_register);
 #endif
-		proc_free_inum(ns->proc_inum);
+		proc_free_inum(ns->ns.inum);
 		kmem_cache_free(user_ns_cachep, ns);
 		ns = parent;
 	} while (atomic_dec_and_test(&parent->count));
@@ -891,7 +891,7 @@
 static unsigned int userns_inum(void *ns)
 {
 	struct user_namespace *user_ns = ns;
-	return user_ns->proc_inum;
+	return user_ns->ns.inum;
 }
 
 const struct proc_ns_operations userns_operations = {

diff --git a/kernel/utsname.c b/kernel/utsname.c
index 883aaaa..b1cd00b 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c

@@ -42,7 +42,7 @@
 	if (!ns)
 		return ERR_PTR(-ENOMEM);
 
-	err = proc_alloc_inum(&ns->proc_inum);
+	err = proc_alloc_inum(&ns->ns.inum);
 	if (err) {
 		kfree(ns);
 		return ERR_PTR(err);
@@ -84,7 +84,7 @@
 
 	ns = container_of(kref, struct uts_namespace, kref);
 	put_user_ns(ns->user_ns);
-	proc_free_inum(ns->proc_inum);
+	proc_free_inum(ns->ns.inum);
 	kfree(ns);
 }
 
@@ -127,7 +127,7 @@
 {
 	struct uts_namespace *ns = vp;
 
-	return ns->proc_inum;
+	return ns->ns.inum;
 }
 
 const struct proc_ns_operations utsns_operations = {

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 7f15517..f2f756c 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c

@@ -386,12 +386,12 @@
 
 static __net_init int net_ns_net_init(struct net *net)
 {
-	return proc_alloc_inum(&net->proc_inum);
+	return proc_alloc_inum(&net->ns.inum);
 }
 
 static __net_exit void net_ns_net_exit(struct net *net)
 {
-	proc_free_inum(net->proc_inum);
+	proc_free_inum(net->ns.inum);
 }
 
 static struct pernet_operations __net_initdata net_ns_ops = {
@@ -664,7 +664,7 @@
 static unsigned int netns_inum(void *ns)
 {
 	struct net *net = ns;
-	return net->proc_inum;
+	return net->ns.inum;
 }
 
 const struct proc_ns_operations netns_operations = {