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batman-adv: remove obsolete deleted attribute for gateway node 

With rcu, the gateway node deleted attribute is not needed anymore. In
fact, it may delay the free of the gateway node and its referenced
structures. Therefore remove it altogether and simplify purging as well.

Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
This commit is contained in:
Simon Wunderlich 2015-08-03 19:13:58 +02:00 committed by Antonio Quartulli
parent 741aa06bfb
commit bd3524c14b
5 changed files with 14 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
net/batman-adv/gateway_client.c
View File

@ -161,9 +161,6 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
rcu_read_lock();
hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
if (gw_node->deleted)
continue;
orig_node = gw_node->orig_node;
router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
if (!router)
@ -473,9 +470,6 @@ batadv_gw_node_get(struct batadv_priv *bat_priv,
if (gw_node_tmp->orig_node != orig_node)
continue;
if (gw_node_tmp->deleted)
continue;
if (!atomic_inc_not_zero(&gw_node_tmp->refcount))
continue;
@ -525,9 +519,7 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
gw_node->deleted = 0;
if (ntohl(gateway->bandwidth_down) == 0) {
gw_node->deleted = jiffies;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Gateway %pM removed from gateway list\n",
orig_node->orig);
@ -535,14 +527,21 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
/* Note: We don't need a NULL check here, since curr_gw never
* gets dereferenced.
*/
spin_lock_bh(&bat_priv->gw.list_lock);
hlist_del_init_rcu(&gw_node->list);
spin_unlock_bh(&bat_priv->gw.list_lock);
batadv_gw_node_free_ref(gw_node);
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
if (gw_node == curr_gw)
batadv_gw_reselect(bat_priv);
if (curr_gw)
batadv_gw_node_free_ref(curr_gw);
}
out:
if (curr_gw)
batadv_gw_node_free_ref(curr_gw);
if (gw_node)
batadv_gw_node_free_ref(gw_node);
}
@ -558,39 +557,19 @@ void batadv_gw_node_delete(struct batadv_priv *bat_priv,
batadv_gw_node_update(bat_priv, orig_node, &gateway);
}
void batadv_gw_node_purge(struct batadv_priv *bat_priv)
void batadv_gw_node_free(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *gw_node, *curr_gw;
struct batadv_gw_node *gw_node;
struct hlist_node *node_tmp;
unsigned long timeout = msecs_to_jiffies(2 * BATADV_PURGE_TIMEOUT);
int do_reselect = 0;
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
spin_lock_bh(&bat_priv->gw.list_lock);
hlist_for_each_entry_safe(gw_node, node_tmp,
&bat_priv->gw.list, list) {
if (((!gw_node->deleted) ||
(time_before(jiffies, gw_node->deleted + timeout))) &&
atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE)
continue;
if (curr_gw == gw_node)
do_reselect = 1;
hlist_del_rcu(&gw_node->list);
hlist_del_init_rcu(&gw_node->list);
batadv_gw_node_free_ref(gw_node);
}
spin_unlock_bh(&bat_priv->gw.list_lock);
/* gw_reselect() needs to acquire the gw_list_lock */
if (do_reselect)
batadv_gw_reselect(bat_priv);
if (curr_gw)
batadv_gw_node_free_ref(curr_gw);
}
/* fails if orig_node has no router */
@ -654,9 +633,6 @@ int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
rcu_read_lock();
hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
if (gw_node->deleted)
continue;
/* fails if orig_node has no router */
if (batadv_write_buffer_text(bat_priv, seq, gw_node) < 0)
continue;

2
net/batman-adv/gateway_client.h
View File

@ -38,7 +38,7 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
struct batadv_tvlv_gateway_data *gateway);
void batadv_gw_node_delete(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node);
void batadv_gw_node_purge(struct batadv_priv *bat_priv);
void batadv_gw_node_free(struct batadv_priv *bat_priv);
int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset);
bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, struct sk_buff *skb);
enum batadv_dhcp_recipient

2
net/batman-adv/main.c
View File

@ -199,7 +199,7 @@ void batadv_mesh_free(struct net_device *soft_iface)
batadv_purge_outstanding_packets(bat_priv, NULL);
batadv_gw_node_purge(bat_priv);
batadv_gw_node_free(bat_priv);
batadv_nc_mesh_free(bat_priv);
batadv_dat_free(bat_priv);
batadv_bla_free(bat_priv);

1
net/batman-adv/originator.c
View File

@ -1028,7 +1028,6 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
spin_unlock_bh(list_lock);
}
batadv_gw_node_purge(bat_priv);
batadv_gw_election(bat_priv);
}

2
net/batman-adv/types.h
View File

@ -328,7 +328,6 @@ enum batadv_orig_capabilities {
* @orig_node: pointer to corresponding orig node
* @bandwidth_down: advertised uplink download bandwidth
* @bandwidth_up: advertised uplink upload bandwidth
* @deleted: this struct is scheduled for deletion
* @refcount: number of contexts the object is used
* @rcu: struct used for freeing in an RCU-safe manner
*/
@ -337,7 +336,6 @@ struct batadv_gw_node {
struct batadv_orig_node *orig_node;
u32 bandwidth_down;
u32 bandwidth_up;
unsigned long deleted;
atomic_t refcount;
struct rcu_head rcu;
};