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net: net_namespace: Optimize the code

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[ Upstream commit 41467d2ff4dfe1837cbb0f45e2088e6e787580c6 ]

There is only one caller for ops_free(), so inline it.
Separate net_drop_ns() and net_free(), so the net_free()
can be called directly.
Add free_exit_list() helper function for free net_exit_list.

====================
v2:
 - v1 does not apply, rebase it.
====================

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 46841c7053e6 ("gtp: Use for_each_netdev_rcu() in gtp_genl_dump_pdp().")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yajun Deng 2021-08-17 23:23:00 +08:00 • committed by Greg Kroah-Hartman
commit 378b81b092
1 changed files with 24 additions and 28 deletions
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52
net/core/net_namespace.c
View file

@ -98,7 +98,7 @@ static int net_assign_generic(struct net *net, unsigned int id, void *data)
}
ng = net_alloc_generic();
if (ng == NULL)
if (!ng)
return -ENOMEM;
/*
@ -155,13 +155,6 @@ out:
return err;
}
static void ops_free(const struct pernet_operations *ops, struct net *net)
{
if (ops->id && ops->size) {
kfree(net_generic(net, *ops->id));
}
}
static void ops_pre_exit_list(const struct pernet_operations *ops,
struct list_head *net_exit_list)
{
@ -193,7 +186,7 @@ static void ops_free_list(const struct pernet_operations *ops,
struct net *net;
if (ops->size && ops->id) {
list_for_each_entry(net, net_exit_list, exit_list)
ops_free(ops, net);
kfree(net_generic(net, *ops->id));
}
}
@ -448,15 +441,18 @@ out_free:
static void net_free(struct net *net)
{
kfree(rcu_access_pointer(net->gen));
kmem_cache_free(net_cachep, net);
if (refcount_dec_and_test(&net->passive)) {
kfree(rcu_access_pointer(net->gen));
kmem_cache_free(net_cachep, net);
}
}
void net_drop_ns(void *p)
{
struct net *ns = p;
if (ns && refcount_dec_and_test(&ns->passive))
net_free(ns);
struct net *net = (struct net *)p;
if (net)
net_free(net);
}
struct net *copy_net_ns(unsigned long flags,
@ -496,7 +492,7 @@ put_userns:
key_remove_domain(net->key_domain);
#endif
put_user_ns(user_ns);
net_drop_ns(net);
net_free(net);
dec_ucounts:
dec_net_namespaces(ucounts);
return ERR_PTR(rv);
@ -630,7 +626,7 @@ static void cleanup_net(struct work_struct *work)
key_remove_domain(net->key_domain);
#endif
put_user_ns(net->user_ns);
net_drop_ns(net);
net_free(net);
}
}
@ -1150,6 +1146,14 @@ static int __init net_ns_init(void)
pure_initcall(net_ns_init);
static void free_exit_list(struct pernet_operations *ops, struct list_head *net_exit_list)
{
ops_pre_exit_list(ops, net_exit_list);
synchronize_rcu();
ops_exit_list(ops, net_exit_list);
ops_free_list(ops, net_exit_list);
}
#ifdef CONFIG_NET_NS
static int __register_pernet_operations(struct list_head *list,
struct pernet_operations *ops)
@ -1175,10 +1179,7 @@ static int __register_pernet_operations(struct list_head *list,
out_undo:
/* If I have an error cleanup all namespaces I initialized */
list_del(&ops->list);
ops_pre_exit_list(ops, &net_exit_list);
synchronize_rcu();
ops_exit_list(ops, &net_exit_list);
ops_free_list(ops, &net_exit_list);
free_exit_list(ops, &net_exit_list);
return error;
}
@ -1191,10 +1192,8 @@ static void __unregister_pernet_operations(struct pernet_operations *ops)
/* See comment in __register_pernet_operations() */
for_each_net(net)
list_add_tail(&net->exit_list, &net_exit_list);
ops_pre_exit_list(ops, &net_exit_list);
synchronize_rcu();
ops_exit_list(ops, &net_exit_list);
ops_free_list(ops, &net_exit_list);
free_exit_list(ops, &net_exit_list);
}
#else
@ -1217,10 +1216,7 @@ static void __unregister_pernet_operations(struct pernet_operations *ops)
} else {
LIST_HEAD(net_exit_list);
list_add(&init_net.exit_list, &net_exit_list);
ops_pre_exit_list(ops, &net_exit_list);
synchronize_rcu();
ops_exit_list(ops, &net_exit_list);
ops_free_list(ops, &net_exit_list);
free_exit_list(ops, &net_exit_list);
}
}