[PATCH 13/23] user: Add user namespaces into ns_idr

[Kirill Tkhai]

Now they are exposed in /proc/namespace/ directory.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 kernel/user_namespace.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 367a942bb484..bbfd7f0f9e7c 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -137,7 +137,13 @@ int create_user_ns(struct cred *new)
                goto fail_keyring;
 
        set_cred_user_ns(new, ns);
+
+       if (ns_idr_register(&ns->ns))
+               goto fail_sysctl;
+
        return 0;
+fail_sysctl:
+       retire_userns_sysctls(ns);
 fail_keyring:
 #ifdef CONFIG_PERSISTENT_KEYRINGS
        key_put(ns->persistent_keyring_register);
@@ -186,6 +192,7 @@ static void free_user_ns(struct work_struct *work)
        do {
                struct ucounts *ucounts = ns->ucounts;
                parent = ns->parent;
+               ns_idr_unregister(&ns->ns);
                if (ns->gid_map.nr_extents > UID_GID_MAP_MAX_BASE_EXTENTS) {
                        kfree(ns->gid_map.forward);
                        kfree(ns->gid_map.reverse);
@@ -1327,6 +1334,7 @@ const struct proc_ns_operations userns_operations = {
 static __init int user_namespaces_init(void)
 {
        user_ns_cachep = KMEM_CACHE(user_namespace, SLAB_PANIC);
-       return 0;
+
+       return ns_idr_register(&init_user_ns.ns);
 }
 subsys_initcall(user_namespaces_init);