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IPVS: Use global mutex in ip_vs_app.c
As part of the work to make IPVS network namespace aware __ip_vs_app_mutex was replaced by a per-namespace lock, ipvs->app_mutex. ipvs->app_key is also supplied for debugging purposes. Unfortunately this implementation results in ipvs->app_key residing in non-static storage which at the very least causes a lockdep warning. This patch takes the rather heavy-handed approach of reinstating __ip_vs_app_mutex which will cover access to the ipvs->list_head of all network namespaces. [ 12.610000] IPVS: Creating netns size=2456 id=0 [ 12.630000] IPVS: Registered protocols (TCP, UDP, SCTP, AH, ESP) [ 12.640000] BUG: key ffff880003bbf1a0 not in .data! [ 12.640000] ------------[ cut here ]------------ [ 12.640000] WARNING: at kernel/lockdep.c:2701 lockdep_init_map+0x37b/0x570() [ 12.640000] Hardware name: Bochs [ 12.640000] Pid: 1, comm: swapper Tainted: G W 2.6.38-kexec-06330-g69b7efe-dirty #122 [ 12.650000] Call Trace: [ 12.650000] [<ffffffff8102e685>] warn_slowpath_common+0x75/0xb0 [ 12.650000] [<ffffffff8102e6d5>] warn_slowpath_null+0x15/0x20 [ 12.650000] [<ffffffff8105967b>] lockdep_init_map+0x37b/0x570 [ 12.650000] [<ffffffff8105829d>] ? trace_hardirqs_on+0xd/0x10 [ 12.650000] [<ffffffff81055ad8>] debug_mutex_init+0x38/0x50 [ 12.650000] [<ffffffff8104bc4c>] __mutex_init+0x5c/0x70 [ 12.650000] [<ffffffff81685ee7>] __ip_vs_app_init+0x64/0x86 [ 12.660000] [<ffffffff81685a3b>] ? ip_vs_init+0x0/0xff [ 12.660000] [<ffffffff811b1c33>] T.620+0x43/0x170 [ 12.660000] [<ffffffff811b1e9a>] ? register_pernet_subsys+0x1a/0x40 [ 12.660000] [<ffffffff81685a3b>] ? ip_vs_init+0x0/0xff [ 12.660000] [<ffffffff81685a3b>] ? ip_vs_init+0x0/0xff [ 12.660000] [<ffffffff811b1db7>] register_pernet_operations+0x57/0xb0 [ 12.660000] [<ffffffff81685a3b>] ? ip_vs_init+0x0/0xff [ 12.670000] [<ffffffff811b1ea9>] register_pernet_subsys+0x29/0x40 [ 12.670000] [<ffffffff81685f19>] ip_vs_app_init+0x10/0x12 [ 12.670000] [<ffffffff81685a87>] ip_vs_init+0x4c/0xff [ 12.670000] [<ffffffff8166562c>] do_one_initcall+0x7a/0x12e [ 12.670000] [<ffffffff8166583e>] kernel_init+0x13e/0x1c2 [ 12.670000] [<ffffffff8128c134>] kernel_thread_helper+0x4/0x10 [ 12.670000] [<ffffffff8128ad40>] ? restore_args+0x0/0x30 [ 12.680000] [<ffffffff81665700>] ? kernel_init+0x0/0x1c2 [ 12.680000] [<ffffffff8128c130>] ? kernel_thread_helper+0x0/0x1global0 Signed-off-by: Simon Horman <horms@verge.net.au> Cc: Ingo Molnar <mingo@elte.hu> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Julian Anastasov <ja@ssi.bg> Cc: Hans Schillstrom <hans@schillstrom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -801,8 +801,6 @@ struct netns_ipvs {
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struct list_head rs_table[IP_VS_RTAB_SIZE];
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struct list_head rs_table[IP_VS_RTAB_SIZE];
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/* ip_vs_app */
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/* ip_vs_app */
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struct list_head app_list;
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struct list_head app_list;
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struct mutex app_mutex;
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struct lock_class_key app_key; /* mutex debuging */
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/* ip_vs_proto */
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/* ip_vs_proto */
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#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
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#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
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@ -43,6 +43,8 @@ EXPORT_SYMBOL(register_ip_vs_app);
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EXPORT_SYMBOL(unregister_ip_vs_app);
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EXPORT_SYMBOL(unregister_ip_vs_app);
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EXPORT_SYMBOL(register_ip_vs_app_inc);
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EXPORT_SYMBOL(register_ip_vs_app_inc);
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static DEFINE_MUTEX(__ip_vs_app_mutex);
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/*
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/*
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* Get an ip_vs_app object
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* Get an ip_vs_app object
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*/
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*/
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@ -167,14 +169,13 @@ int
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register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
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register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
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__u16 port)
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__u16 port)
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{
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{
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struct netns_ipvs *ipvs = net_ipvs(net);
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int result;
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int result;
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mutex_lock(&ipvs->app_mutex);
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mutex_lock(&__ip_vs_app_mutex);
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result = ip_vs_app_inc_new(net, app, proto, port);
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result = ip_vs_app_inc_new(net, app, proto, port);
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mutex_unlock(&ipvs->app_mutex);
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mutex_unlock(&__ip_vs_app_mutex);
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return result;
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return result;
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}
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}
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@ -189,11 +190,11 @@ int register_ip_vs_app(struct net *net, struct ip_vs_app *app)
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/* increase the module use count */
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/* increase the module use count */
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ip_vs_use_count_inc();
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ip_vs_use_count_inc();
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mutex_lock(&ipvs->app_mutex);
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mutex_lock(&__ip_vs_app_mutex);
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list_add(&app->a_list, &ipvs->app_list);
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list_add(&app->a_list, &ipvs->app_list);
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mutex_unlock(&ipvs->app_mutex);
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mutex_unlock(&__ip_vs_app_mutex);
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return 0;
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return 0;
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}
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}
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@ -205,10 +206,9 @@ int register_ip_vs_app(struct net *net, struct ip_vs_app *app)
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*/
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*/
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void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app)
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void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app)
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{
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{
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struct netns_ipvs *ipvs = net_ipvs(net);
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struct ip_vs_app *inc, *nxt;
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struct ip_vs_app *inc, *nxt;
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mutex_lock(&ipvs->app_mutex);
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mutex_lock(&__ip_vs_app_mutex);
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list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) {
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list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) {
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ip_vs_app_inc_release(net, inc);
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ip_vs_app_inc_release(net, inc);
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@ -216,7 +216,7 @@ void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app)
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list_del(&app->a_list);
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list_del(&app->a_list);
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mutex_unlock(&ipvs->app_mutex);
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mutex_unlock(&__ip_vs_app_mutex);
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/* decrease the module use count */
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/* decrease the module use count */
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ip_vs_use_count_dec();
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ip_vs_use_count_dec();
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@ -501,7 +501,7 @@ static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos)
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struct net *net = seq_file_net(seq);
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struct net *net = seq_file_net(seq);
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struct netns_ipvs *ipvs = net_ipvs(net);
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struct netns_ipvs *ipvs = net_ipvs(net);
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mutex_lock(&ipvs->app_mutex);
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mutex_lock(&__ip_vs_app_mutex);
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return *pos ? ip_vs_app_idx(ipvs, *pos - 1) : SEQ_START_TOKEN;
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return *pos ? ip_vs_app_idx(ipvs, *pos - 1) : SEQ_START_TOKEN;
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}
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}
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@ -535,9 +535,7 @@ static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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static void ip_vs_app_seq_stop(struct seq_file *seq, void *v)
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static void ip_vs_app_seq_stop(struct seq_file *seq, void *v)
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{
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{
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struct netns_ipvs *ipvs = net_ipvs(seq_file_net(seq));
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mutex_unlock(&__ip_vs_app_mutex);
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mutex_unlock(&ipvs->app_mutex);
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}
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}
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static int ip_vs_app_seq_show(struct seq_file *seq, void *v)
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static int ip_vs_app_seq_show(struct seq_file *seq, void *v)
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@ -583,7 +581,6 @@ static int __net_init __ip_vs_app_init(struct net *net)
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struct netns_ipvs *ipvs = net_ipvs(net);
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struct netns_ipvs *ipvs = net_ipvs(net);
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INIT_LIST_HEAD(&ipvs->app_list);
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INIT_LIST_HEAD(&ipvs->app_list);
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__mutex_init(&ipvs->app_mutex, "ipvs->app_mutex", &ipvs->app_key);
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proc_net_fops_create(net, "ip_vs_app", 0, &ip_vs_app_fops);
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proc_net_fops_create(net, "ip_vs_app", 0, &ip_vs_app_fops);
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return 0;
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return 0;
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}
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}
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