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authorJohannes Berg <johannes@sipsolutions.net>2009-08-07 16:17:38 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-08-14 09:13:43 -0400
commitf5ea9120be2e5d5c846243416cfdce01d02f5836 (patch)
treecade27e47a90dde79a523598b96a2ebb50770d2f /net/mac80211/mesh_pathtbl.c
parentf401a6f7ede753e56b84025e7d2db0d5ef560ce6 (diff)
nl80211: add generation number to all dumps
In order for userspace to be able to figure out whether it obtained a consistent snapshot of data or not when using netlink dumps, we need to have a generation number in each dump message that indicates whether the list has changed or not -- its value is arbitrary. This patch adds such a number to all dumps, this needs some mac80211 involvement to keep track of a generation number to start with when adding/removing mesh paths or stations. The wiphy and netdev lists can be fully handled within cfg80211, of course, but generation numbers need to be stored there as well. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/mesh_pathtbl.c')
-rw-r--r--net/mac80211/mesh_pathtbl.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 04b9e4d61b8..431865a5862 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -38,6 +38,8 @@ struct mpath_node {
static struct mesh_table *mesh_paths;
static struct mesh_table *mpp_paths; /* Store paths for MPP&MAP */
+int mesh_paths_generation;
+
/* This lock will have the grow table function as writer and add / delete nodes
* as readers. When reading the table (i.e. doing lookups) we are well protected
* by RCU
@@ -243,6 +245,8 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata)
mesh_paths->mean_chain_len * (mesh_paths->hash_mask + 1))
grow = 1;
+ mesh_paths_generation++;
+
spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
if (grow) {
@@ -484,6 +488,7 @@ int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata)
err = -ENXIO;
enddel:
+ mesh_paths_generation++;
spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
return err;