[patch -mm 3/7] add an identifier to nsproxy

[Cedric Le Goater]

This patch adds an identifier to nsproxy. The default init_ns_proxy
has identifier 0 and allocated nsproxies are given -1.

This identifier will be used by a new syscall sys_bind_ns.

Signed-off-by: Cedric Le Goater <clg@xxxxxxxxxx>
Cc: Kirill Korotaev <dev@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Herbert Poetzl <herbert@xxxxxxxxxxxx>
Cc: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxx>
---
 include/linux/init_task.h |    1 +
 include/linux/nsproxy.h   |    1 +
 kernel/nsproxy.c          |    1 +
 3 files changed, 3 insertions(+)

Index: 2.6.19-rc2-mm1/include/linux/init_task.h
===================================================================
--- 2.6.19-rc2-mm1.orig/include/linux/init_task.h
+++ 2.6.19-rc2-mm1/include/linux/init_task.h
@@ -72,6 +72,7 @@ extern struct nsproxy init_nsproxy;
 #define INIT_NSPROXY(nsproxy) {						\
 	.count		= ATOMIC_INIT(1),				\
 	.nslock		= SPIN_LOCK_UNLOCKED,				\
+	.id		= 0,						\
 	.uts_ns		= &init_uts_ns,					\
 	.mnt_ns		= NULL,						\
 	INIT_IPC_NS(ipc_ns)						\
Index: 2.6.19-rc2-mm1/include/linux/nsproxy.h
===================================================================
--- 2.6.19-rc2-mm1.orig/include/linux/nsproxy.h
+++ 2.6.19-rc2-mm1/include/linux/nsproxy.h
@@ -23,6 +23,7 @@ struct ipc_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;
Index: 2.6.19-rc2-mm1/kernel/nsproxy.c
===================================================================
--- 2.6.19-rc2-mm1.orig/kernel/nsproxy.c
+++ 2.6.19-rc2-mm1/kernel/nsproxy.c
@@ -48,6 +48,7 @@ static inline struct nsproxy *clone_name
 	if (ns) {
 		memcpy(ns, orig, sizeof(struct nsproxy));
 		atomic_set(&ns->count, 1);
+		ns->id = -1;
 	}
 	return ns;
 }

--
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