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xfrm: remove policy garbage collection 

Policies are now properly reference counted and destroyed from
all code paths. The delayed gc is just an overhead now and can
be removed.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timo Teräs 2010-04-07 00:30:06 +00:00 committed by David S. Miller
parent 80c802f307
commit 285ead175c
1 changed files with 5 additions and 34 deletions
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39
net/xfrm/xfrm_policy.c
View File

@ -46,9 +46,6 @@ static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
static struct kmem_cache *xfrm_dst_cache __read_mostly; static struct kmem_cache *xfrm_dst_cache __read_mostly;
static HLIST_HEAD(xfrm_policy_gc_list);
static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
static void xfrm_init_pmtu(struct dst_entry *dst); static void xfrm_init_pmtu(struct dst_entry *dst);
@ -288,32 +285,6 @@ void xfrm_policy_destroy(struct xfrm_policy *policy)
} }
EXPORT_SYMBOL(xfrm_policy_destroy); EXPORT_SYMBOL(xfrm_policy_destroy);
static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
{
atomic_inc(&policy->genid);
if (del_timer(&policy->timer))
atomic_dec(&policy->refcnt);
xfrm_pol_put(policy);
}
static void xfrm_policy_gc_task(struct work_struct *work)
{
struct xfrm_policy *policy;
struct hlist_node *entry, *tmp;
struct hlist_head gc_list;
spin_lock_bh(&xfrm_policy_gc_lock);
gc_list.first = xfrm_policy_gc_list.first;
INIT_HLIST_HEAD(&xfrm_policy_gc_list);
spin_unlock_bh(&xfrm_policy_gc_lock);
hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
xfrm_policy_gc_kill(policy);
}
static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task);
/* Rule must be locked. Release descentant resources, announce /* Rule must be locked. Release descentant resources, announce
* entry dead. The rule must be unlinked from lists to the moment. * entry dead. The rule must be unlinked from lists to the moment.
*/ */
@ -322,11 +293,12 @@ static void xfrm_policy_kill(struct xfrm_policy *policy)
{ {
policy->walk.dead = 1; policy->walk.dead = 1;
spin_lock_bh(&xfrm_policy_gc_lock); atomic_inc(&policy->genid);
hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
spin_unlock_bh(&xfrm_policy_gc_lock);
schedule_work(&xfrm_policy_gc_work); if (del_timer(&policy->timer))
xfrm_pol_put(policy);
xfrm_pol_put(policy);
} }
static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
@ -2599,7 +2571,6 @@ static void xfrm_policy_fini(struct net *net)
audit_info.sessionid = -1; audit_info.sessionid = -1;
audit_info.secid = 0; audit_info.secid = 0;
xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
flush_work(&xfrm_policy_gc_work);
WARN_ON(!list_empty(&net->xfrm.policy_all)); WARN_ON(!list_empty(&net->xfrm.policy_all));