userns: Deprecate and rename the user_namespace reference in the user_struct

With a user_ns reference in struct cred the only user of the user namespace
reference in struct user_struct is to keep the uid hash table alive.

The user_namespace reference in struct user_struct will be going away soon, and
I have removed all of the references.  Rename the field from user_ns to _user_ns
so that the compiler can verify nothing follows the user struct to the user
namespace anymore.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 720ce8d98a7d..6867ae9bc8a0 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -729,7 +729,7 @@ struct user_struct {
         /* Hash table maintenance information */
         struct hlist_node uidhash_node;
         uid_t uid;
-        struct user_namespace *user_ns;
+        struct user_namespace *_user_ns; /* Don't use will be removed soon */
 
 #ifdef CONFIG_PERF_EVENTS
         atomic_long_t locked_vm;