[PATCH] Revert "[PATCH] identifier to nsproxy"

This reverts commit 373beb35cd.

No one is using this identifier yet.  The purpose of this identifier is to
export nsproxy to user space which is wrong.  nsproxy is an internal
implementation optimization, which should keep our fork times from getting
slower as we increase the number of global namespaces you don't have to
share.

Adding a global identifier like this is inappropriate because it makes
namespaces inherently non-recursive, greatly limiting what we can do with
them in the future.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/init_task.h

@@ -75,7 +75,6 @@ extern struct nsproxy init_nsproxy;
 	.pid_ns		= &init_pid_ns,					\
 	.count		= ATOMIC_INIT(1),				\
 	.nslock		= __SPIN_LOCK_UNLOCKED(nsproxy.nslock),		\
-	.id		= 0,						\
 	.uts_ns		= &init_uts_ns,					\
 	.mnt_ns		= NULL,						\
 	INIT_IPC_NS(ipc_ns)						\

include/linux/nsproxy.h

@@ -24,7 +24,6 @@ struct pid_namespace;
 struct nsproxy {
 	atomic_t count;
 	spinlock_t nslock;
-	unsigned long id;
 	struct uts_namespace *uts_ns;
 	struct ipc_namespace *ipc_ns;
 	struct mnt_namespace *mnt_ns;

kernel/nsproxy.c

@@ -46,10 +46,8 @@ static inline struct nsproxy *clone_namespaces(struct nsproxy *orig)
 	struct nsproxy *ns;
 
 	ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL);
-	if (ns) {
+	if (ns)
 		atomic_set(&ns->count, 1);
-		ns->id = -1;
-	}
 	return ns;
 }