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Revert "netns: don't clear nsid too early on removal"

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This reverts
commit 4217291e59 ("netns: don't clear nsid too early on removal").

This is not the right fix, it introduces races.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2015-04-03 12:02:36 +02:00 committed by David S. Miller
parent 7ba0c47c34
commit 6d458f5b4e
1 changed files with 9 additions and 15 deletions
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24
net/core/net_namespace.c
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@ -349,7 +349,7 @@ static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */
static void cleanup_net(struct work_struct *work)
{
const struct pernet_operations *ops;
struct net *net, *tmp, *peer;
struct net *net, *tmp;
struct list_head net_kill_list;
LIST_HEAD(net_exit_list);
@ -365,6 +365,14 @@ static void cleanup_net(struct work_struct *work)
list_for_each_entry(net, &net_kill_list, cleanup_list) {
list_del_rcu(&net->list);
list_add_tail(&net->exit_list, &net_exit_list);
for_each_net(tmp) {
int id = __peernet2id(tmp, net, false);
if (id >= 0)
idr_remove(&tmp->netns_ids, id);
}
idr_destroy(&net->netns_ids);
}
rtnl_unlock();
@ -390,26 +398,12 @@ static void cleanup_net(struct work_struct *work)
*/
rcu_barrier();
rtnl_lock();
/* Finally it is safe to free my network namespace structure */
list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) {
/* Unreference net from all peers (no need to loop over
* net_exit_list because idr_destroy() will be called for each
* element of this list.
*/
for_each_net(peer) {
int id = __peernet2id(peer, net, false);
if (id >= 0)
idr_remove(&peer->netns_ids, id);
}
idr_destroy(&net->netns_ids);
list_del_init(&net->exit_list);
put_user_ns(net->user_ns);
net_drop_ns(net);
}
rtnl_unlock();
}
static DECLARE_WORK(net_cleanup_work, cleanup_net);