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authorEric W. Biederman <ebiederm@xmission.com>2009-12-03 12:22:55 -0800
committerDavid S. Miller <davem@davemloft.net>2009-12-03 12:22:55 -0800
commite9c5158ac26affd5d8ce006521bdfb7148090e18 (patch)
treea8d43fb446a1908175923f4109c977dcb84e4f91 /net/core/fib_rules.c
parent3a765edadb28cc736d185f67d1ba6bedcc85f4b9 (diff)
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net: Allow fib_rule_unregister to batch
Refactor the code so fib_rules_register always takes a template instead of the actual fib_rules_ops structure that will be used. This is required for network namespace support so 2 out of the 3 callers already do this, it allows the error handling to be made common, and it allows fib_rules_unregister to free the template for hte caller. Modify fib_rules_unregister to use call_rcu instead of syncrhonize_rcu to allw multiple namespaces to be cleaned up in the same rcu grace period. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/fib_rules.c')
-rw-r--r--net/core/fib_rules.c36
1 files changed, 33 insertions, 3 deletions
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index ef0e7d9..02a3b2c 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -72,7 +72,7 @@ static void flush_route_cache(struct fib_rules_ops *ops)
ops->flush_cache(ops);
}
-int fib_rules_register(struct fib_rules_ops *ops)
+static int __fib_rules_register(struct fib_rules_ops *ops)
{
int err = -EEXIST;
struct fib_rules_ops *o;
@@ -102,6 +102,28 @@ errout:
return err;
}
+struct fib_rules_ops *
+fib_rules_register(struct fib_rules_ops *tmpl, struct net *net)
+{
+ struct fib_rules_ops *ops;
+ int err;
+
+ ops = kmemdup(tmpl, sizeof (*ops), GFP_KERNEL);
+ if (ops == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&ops->rules_list);
+ ops->fro_net = net;
+
+ err = __fib_rules_register(ops);
+ if (err) {
+ kfree(ops);
+ ops = ERR_PTR(err);
+ }
+
+ return ops;
+}
+
EXPORT_SYMBOL_GPL(fib_rules_register);
void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
@@ -115,6 +137,15 @@ void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
}
EXPORT_SYMBOL_GPL(fib_rules_cleanup_ops);
+static void fib_rules_put_rcu(struct rcu_head *head)
+{
+ struct fib_rules_ops *ops = container_of(head, struct fib_rules_ops, rcu);
+ struct net *net = ops->fro_net;
+
+ release_net(net);
+ kfree(ops);
+}
+
void fib_rules_unregister(struct fib_rules_ops *ops)
{
struct net *net = ops->fro_net;
@@ -124,8 +155,7 @@ void fib_rules_unregister(struct fib_rules_ops *ops)
fib_rules_cleanup_ops(ops);
spin_unlock(&net->rules_mod_lock);
- synchronize_rcu();
- release_net(net);
+ call_rcu(&ops->rcu, fib_rules_put_rcu);
}
EXPORT_SYMBOL_GPL(fib_rules_unregister);