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authorThomas Graf <tgraf@infradead.org>2011-06-21 03:11:20 +0000
committerDavid S. Miller <davem@davemloft.net>2011-07-01 15:39:53 -0700
commit4e985adaa504c1c1a05c8e013777ea0791a17b4d (patch)
treed2eedf47256577ebfc67f0356c9b348590b560d3 /include/net/net_namespace.h
parente77aeb71f04ed236fffe5f347e208c8b0e92d48a (diff)
rtnl: provide link dump consistency info
This patch adds a change sequence counter to each net namespace which is bumped whenever a netdevice is added or removed from the list. If such a change occurred while a link dump took place, the dump will have the NLM_F_DUMP_INTR flag set in the first message which has been interrupted and in all subsequent messages of the same dump. Note that links may still be modified or renamed while a dump is taking place but we can guarantee for userspace to receive a complete list of links and not miss any. Testing: I have added 500 VLAN netdevices to make sure the dump is split over multiple messages. Then while continuously dumping links in one process I also continuously deleted and re-added a dummy netdevice in another process. Multiple dumps per seconds have had the NLM_F_DUMP_INTR flag set. I guess we can wait for Johannes patch to hit net-next via the wireless tree. I just wanted to give this some testing right away. Signed-off-by: Thomas Graf <tgraf@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/net_namespace.h')
-rw-r--r--include/net/net_namespace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index aef430d779bd..1ab1aec209ac 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -65,6 +65,7 @@ struct net {
struct list_head dev_base_head;
struct hlist_head *dev_name_head;
struct hlist_head *dev_index_head;
+ unsigned int dev_base_seq; /* protected by rtnl_mutex */
/* core fib_rules */
struct list_head rules_ops;