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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>
This commit is contained in:
Eric W. Biederman 2011-11-16 23:20:58 -08:00
parent 6f9ac6d93a
commit d0bd6594e2
2 changed files with 4 additions and 4 deletions
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2
include/linux/sched.h
View File

@ -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;

6
kernel/user.c
View File

@ -58,7 +58,7 @@ struct user_struct root_user = {
.files = ATOMIC_INIT(0),
.sigpending = ATOMIC_INIT(0),
.locked_shm = 0,
.user_ns = &init_user_ns,
._user_ns = &init_user_ns,
};
/*
@ -72,7 +72,7 @@ static void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
static void uid_hash_remove(struct user_struct *up)
{
hlist_del_init(&up->uidhash_node);
put_user_ns(up->user_ns);
put_user_ns(up->_user_ns); /* It is safe to free the uid hash table now */
}
static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
@ -153,7 +153,7 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
new->uid = uid;
atomic_set(&new->__count, 1);
new->user_ns = get_user_ns(ns);
new->_user_ns = get_user_ns(ns);
/*
* Before adding this, check whether we raced