[PATCH 05/11] SUNRPC: register debug sysctl table per network namespace

[Stanislav Kinsbursky <skinsbursky@parallels.com>]

This patch introduces per-net sysctl header for debug table and moves debug
table registration to per-net opreations.
Also, this patch moves SUNRPC sysctl root registration prior to per-net
operations, since now they depends on it.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>

---
 net/sunrpc/netns.h       |    1 +
 net/sunrpc/sunrpc_syms.c |    9 ++++++---
 net/sunrpc/sysctl.c      |   17 +++++++----------
 3 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
index a949ddb..05ce3b8 100644
--- a/net/sunrpc/netns.h
+++ b/net/sunrpc/netns.h
@@ -14,6 +14,7 @@ struct sunrpc_net {
 	spinlock_t rpc_client_lock;
 #ifdef RPC_DEBUG
 	struct ctl_table_set sysctls;
+	struct ctl_table_header *debug_ctl_header;
 #endif
 };
 
diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index 44759e9..0fd156a 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -90,18 +90,21 @@ init_sunrpc(void)
 
 	cache_initialize();
 
-	err = register_pernet_subsys(&sunrpc_net_ops);
-	if (err)
-		goto out4;
 #ifdef RPC_DEBUG
 	rpc_register_sysctl();
 #endif
+	err = register_pernet_subsys(&sunrpc_net_ops);
+	if (err)
+		goto out4;
 	cache_register(&unix_gid_cache);
 	svc_init_xprt_sock();	/* svc sock transport */
 	init_socket_xprt();	/* clnt sock transport */
 	return 0;
 
 out4:
+#ifdef RPC_DEBUG
+	rpc_unregister_sysctl();
+#endif
 	rpcauth_remove_module();
 out3:
 	rpc_destroy_mempool();
diff --git a/net/sunrpc/sysctl.c b/net/sunrpc/sysctl.c
index adebf0a..eda80cf 100644
--- a/net/sunrpc/sysctl.c
+++ b/net/sunrpc/sysctl.c
@@ -42,7 +42,6 @@ EXPORT_SYMBOL_GPL(nlm_debug);
 #include <linux/nsproxy.h>
 #include "netns.h"
 
-static struct ctl_table_header *sunrpc_table_header;
 static ctl_table		debug_table[];
 
 struct ctl_path sunrpc_path[] = {
@@ -79,6 +78,9 @@ int debug_sysctl_init(struct net *net)
 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
 	setup_sysctl_set(&sn->sysctls, NULL, NULL);
+	sn->debug_ctl_header = register_sunrpc_sysctl(net, debug_table);
+	if (sn->debug_ctl_header == NULL)
+		return -ENOMEM;
 	return 0;
 }
 
@@ -86,26 +88,21 @@ void debug_sysctl_exit(struct net *net)
 {
 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
+	unregister_sysctl_table(sn->debug_ctl_header);
+	sn->debug_ctl_header = NULL;
 	WARN_ON(!list_empty(&sn->sysctls.list));
 }
 
 void
 rpc_register_sysctl(void)
 {
-	if (!sunrpc_table_header) {
-		register_sysctl_root(&sunrpc_debug_root);
-		sunrpc_table_header = register_sunrpc_sysctl(&init_net, debug_table);
-	}
+	register_sysctl_root(&sunrpc_debug_root);
 }
 
 void
 rpc_unregister_sysctl(void)
 {
-	if (sunrpc_table_header) {
-		unregister_sysctl_table(sunrpc_table_header);
-		unregister_sysctl_root(&sunrpc_debug_root);
-		sunrpc_table_header = NULL;
-	}
+	unregister_sysctl_root(&sunrpc_debug_root);
 }
 
 static int proc_do_xprt(ctl_table *table, int write,