[Devel] [PATCH 06/11] SUNRPC: register xs_tunables sysctl table per network namespace

[Stanislav Kinsbursky]

This patch introduces per-net sysctl header for xs_tunables table and moves
xs_tunables table registration to per-net opreations.

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

---
 include/linux/sunrpc/xprtsock.h |    3 ++
 net/sunrpc/netns.h              |    1 +
 net/sunrpc/sunrpc_syms.c        |    7 +++++
 net/sunrpc/xprtsock.c           |   52 +++++++++++++++++++++++++++++----------
 4 files changed, 49 insertions(+), 14 deletions(-)

diff --git a/include/linux/sunrpc/xprtsock.h b/include/linux/sunrpc/xprtsock.h
index 3f14a02..3ba4920 100644
--- a/include/linux/sunrpc/xprtsock.h
+++ b/include/linux/sunrpc/xprtsock.h
@@ -9,6 +9,9 @@
 
 #ifdef __KERNEL__
 
+int socket_sysctl_init(struct net *);
+void socket_sysctl_exit(struct net *);
+
 int		init_socket_xprt(void);
 void		cleanup_socket_xprt(void);
 
diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
index 05ce3b8..da825e5 100644
--- a/net/sunrpc/netns.h
+++ b/net/sunrpc/netns.h
@@ -15,6 +15,7 @@ struct sunrpc_net {
 #ifdef RPC_DEBUG
 	struct ctl_table_set sysctls;
 	struct ctl_table_header *debug_ctl_header;
+	struct ctl_table_header *xs_tunables_header;
 #endif
 };
 
diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index 0fd156a..2b76e18 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -42,12 +42,18 @@ static __net_init int sunrpc_init_net(struct net *net)
 	err = debug_sysctl_init(net);
 	if (err)
 		goto err_sysctl;
+
+	err = socket_sysctl_init(net);
+	if (err)
+		goto err_sock_ctl;
 #endif
 	INIT_LIST_HEAD(&sn->all_clients);
 	spin_lock_init(&sn->rpc_client_lock);
 	return 0;
 
 #ifdef RPC_DEBUG
+err_sock_ctl:
+	debug_sysctl_exit(net);
 err_sysctl:
 	ip_map_cache_destroy(net);
 #endif
@@ -60,6 +66,7 @@ err_proc:
 static __net_exit void sunrpc_exit_net(struct net *net)
 {
 #ifdef RPC_DEBUG
+	socket_sysctl_exit(net);
 	debug_sysctl_exit(net);
 #endif
 	ip_map_cache_destroy(net);
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 1acc9a7..9e42db6 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -74,14 +74,14 @@ static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
 
 #ifdef RPC_DEBUG
 
+#include "netns.h"
+
 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
 
-static struct ctl_table_header *sunrpc_table_header;
-
 /*
  * FIXME: changing the UDP slot table size should also resize the UDP
  *        socket buffers for existing UDP transports
@@ -2870,17 +2870,48 @@ static struct xprt_class	xs_bc_tcp_transport = {
 	.setup		= xs_setup_bc_tcp,
 };
 
+#ifdef RPC_DEBUG
+int create_xs_tunables_table(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+	sn->xs_tunables_header = register_sunrpc_sysctl(net, xs_tunables_table);
+	if (sn->xs_tunables_header == NULL)
+		return -ENOMEM;
+	return 0;
+
+}
+void destroy_xs_tunables_table(struct net *net)
+{
+	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+	unregister_sysctl_table(sn->xs_tunables_header);
+	sn->xs_tunables_header = NULL;
+}
+#endif
+
+
+int socket_sysctl_init(struct net *net)
+{
+#ifdef RPC_DEBUG
+	return create_xs_tunables_table(net);
+#else
+	return 0;
+#endif
+}
+
+void socket_sysctl_exit(struct net *net)
+{
+#ifdef RPC_DEBUG
+	destroy_xs_tunables_table(net);
+#endif
+}
+
 /**
  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
  *
  */
 int init_socket_xprt(void)
 {
-#ifdef RPC_DEBUG
-	if (!sunrpc_table_header)
-		sunrpc_table_header = register_sunrpc_sysctl(&init_net, xs_tunables_table);
-#endif
-
 	xprt_register_transport(&xs_local_transport);
 	xprt_register_transport(&xs_udp_transport);
 	xprt_register_transport(&xs_tcp_transport);
@@ -2895,13 +2926,6 @@ int init_socket_xprt(void)
  */
 void cleanup_socket_xprt(void)
 {
-#ifdef RPC_DEBUG
-	if (sunrpc_table_header) {
-		unregister_sysctl_table(sunrpc_table_header);
-		sunrpc_table_header = NULL;
-	}
-#endif
-
 	xprt_unregister_transport(&xs_local_transport);
 	xprt_unregister_transport(&xs_udp_transport);
 	xprt_unregister_transport(&xs_tcp_transport);