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net: Allow fib_rule_unregister to batch

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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric W. Biederman 2009-12-03 12:22:55 -08:00 • committed by David S. Miller
commit e9c5158ac2
5 changed files with 57 additions and 38 deletions
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22
net/decnet/dn_rules.c
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@ -33,7 +33,7 @@
#include <net/dn_dev.h>
#include <net/dn_route.h>
static struct fib_rules_ops dn_fib_rules_ops;
static struct fib_rules_ops *dn_fib_rules_ops;
struct dn_fib_rule
{
@ -56,7 +56,7 @@ int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
};
int err;
err = fib_rules_lookup(&dn_fib_rules_ops, flp, 0, &arg);
err = fib_rules_lookup(dn_fib_rules_ops, flp, 0, &arg);
res->r = arg.rule;
return err;
@ -217,9 +217,9 @@ static u32 dn_fib_rule_default_pref(struct fib_rules_ops *ops)
struct list_head *pos;
struct fib_rule *rule;
if (!list_empty(&dn_fib_rules_ops.rules_list)) {
pos = dn_fib_rules_ops.rules_list.next;
if (pos->next != &dn_fib_rules_ops.rules_list) {
if (!list_empty(&dn_fib_rules_ops->rules_list)) {
pos = dn_fib_rules_ops->rules_list.next;
if (pos->next != &dn_fib_rules_ops->rules_list) {
rule = list_entry(pos->next, struct fib_rule, list);
if (rule->pref)
return rule->pref - 1;
@ -234,7 +234,7 @@ static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
dn_rt_cache_flush(-1);
}
static struct fib_rules_ops dn_fib_rules_ops = {
static struct fib_rules_ops dn_fib_rules_ops_template = {
.family = AF_DECnet,
.rule_size = sizeof(struct dn_fib_rule),
.addr_size = sizeof(u16),
@ -247,21 +247,23 @@ static struct fib_rules_ops dn_fib_rules_ops = {
.flush_cache = dn_fib_rule_flush_cache,
.nlgroup = RTNLGRP_DECnet_RULE,
.policy = dn_fib_rule_policy,
.rules_list = LIST_HEAD_INIT(dn_fib_rules_ops.rules_list),
.owner = THIS_MODULE,
.fro_net = &init_net,
};
void __init dn_fib_rules_init(void)
{
BUG_ON(fib_default_rule_add(&dn_fib_rules_ops, 0x7fff,
dn_fib_rules_ops =
fib_rules_register(&dn_fib_rules_ops_template, &init_net);
BUG_ON(IS_ERR(dn_fib_rules_ops));
BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
RT_TABLE_MAIN, 0));
fib_rules_register(&dn_fib_rules_ops);
}
void __exit dn_fib_rules_cleanup(void)
{
fib_rules_unregister(&dn_fib_rules_ops);
fib_rules_unregister(dn_fib_rules_ops);
rcu_barrier();
}