EXPORT_SYMBOL(init_net);
static bool init_net_initialized;
-static unsigned nr_sync_pernet_ops;
/*
- * net_sem: protects: pernet_list, net_generic_ids, nr_sync_pernet_ops,
+ * net_sem: protects: pernet_list, net_generic_ids,
* init_net_initialized and first_device pointer.
*/
DECLARE_RWSEM(net_sem);
{
struct ucounts *ucounts;
struct net *net;
- unsigned write;
int rv;
if (!(flags & CLONE_NEWNET))
refcount_set(&net->passive, 1);
net->ucounts = ucounts;
get_user_ns(user_ns);
-again:
- write = READ_ONCE(nr_sync_pernet_ops);
- if (write)
- rv = down_write_killable(&net_sem);
- else
- rv = down_read_killable(&net_sem);
+
+ rv = down_read_killable(&net_sem);
if (rv < 0)
goto put_userns;
- if (!write && unlikely(READ_ONCE(nr_sync_pernet_ops))) {
- up_read(&net_sem);
- goto again;
- }
rv = setup_net(net, user_ns);
- if (write)
- up_write(&net_sem);
- else
- up_read(&net_sem);
+ up_read(&net_sem);
if (rv < 0) {
put_userns:
struct net *net, *tmp, *last;
struct llist_node *net_kill_list;
LIST_HEAD(net_exit_list);
- unsigned write;
/* Atomically snapshot the list of namespaces to cleanup */
net_kill_list = llist_del_all(&cleanup_list);
-again:
- write = READ_ONCE(nr_sync_pernet_ops);
- if (write)
- down_write(&net_sem);
- else
- down_read(&net_sem);
- if (!write && unlikely(READ_ONCE(nr_sync_pernet_ops))) {
- up_read(&net_sem);
- goto again;
- }
+ down_read(&net_sem);
/* Don't let anyone else find us. */
rtnl_lock();
list_for_each_entry_reverse(ops, &pernet_list, list)
ops_free_list(ops, &net_exit_list);
- if (write)
- up_write(&net_sem);
- else
- up_read(&net_sem);
+ up_read(&net_sem);
/* Ensure there are no outstanding rcu callbacks using this
* network namespace.
rcu_barrier();
if (ops->id)
ida_remove(&net_generic_ids, *ops->id);
- } else if (!ops->async) {
- pr_info_once("Pernet operations %ps are sync.\n", ops);
- nr_sync_pernet_ops++;
}
return error;
static void unregister_pernet_operations(struct pernet_operations *ops)
{
- if (!ops->async)
- BUG_ON(nr_sync_pernet_ops-- == 0);
__unregister_pernet_operations(ops);
rcu_barrier();
if (ops->id)