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Subject[PATCH 17/23] pid: Add pid namespaces into ns_idr
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Now they are exposed in /proc/namespace/ directory.

Note, that we already wait RCU grace period before
pid namespace's memory is freed.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
kernel/pid_namespace.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index da8490390f51..06398a7c4c59 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -109,8 +109,13 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
ns->ucounts = ucounts;
ns->pid_allocated = PIDNS_ADDING;

+ if (ns_idr_register(&ns->ns) < 0)
+ goto out_free_inum;
+
return ns;

+out_free_inum:
+ ns_free_inum(&ns->ns);
out_free_idr:
idr_destroy(&ns->idr);
kmem_cache_free(pid_ns_cachep, ns);
@@ -132,6 +137,7 @@ static void delayed_free_pidns(struct rcu_head *p)

static void destroy_pid_namespace(struct pid_namespace *ns)
{
+ ns_idr_unregister(&ns->ns);
ns_free_inum(&ns->ns);

idr_destroy(&ns->idr);
@@ -466,6 +472,7 @@ static __init int pid_namespaces_init(void)
#ifdef CONFIG_CHECKPOINT_RESTORE
register_sysctl_paths(kern_path, pid_ns_ctl_table);
#endif
+ WARN_ON(ns_idr_register(&init_pid_ns.ns) < 0);
return 0;
}


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