[PATCH 18/22] Export nsm_local_state to user space via sysctl

[PATCH 18/22] Export nsm_local_state to user space via sysctl

[Olaf Kirch]

From: Olaf Kirch <okir@suse.de>
Subject: Export nsm_local_state to user space via sysctl

  Every NLM call includes the client's NSM state. Currently,
  the Linux client always reports 0 - which seems not to cause
  any problems, but is not what the protocol says.

  This patch exposes the kernel's internal variable to user
  space via a sysctl, which can be set at system boot time
  by statd.

Signed-off-by: Olaf Kirch <okir@suse.de>


 fs/lockd/mon.c                 |    2 +-
 fs/lockd/svc.c                 |    9 +++++++++
 include/linux/lockd/sm_inter.h |    2 +-
 3 files changed, 11 insertions(+), 2 deletions(-)

Index: build/fs/lockd/mon.c
===================================================================
--- build.orig/fs/lockd/mon.c
+++ build/fs/lockd/mon.c
@@ -24,7 +24,7 @@ static struct rpc_program	nsm_program;
 /*
  * Local NSM state
  */
-u32				nsm_local_state;
+int				nsm_local_state;
 
 /*
  * Common procedure for SM_MON/SM_UNMON calls
Index: build/fs/lockd/svc.c
===================================================================
--- build.orig/fs/lockd/svc.c
+++ build/fs/lockd/svc.c
@@ -32,6 +32,7 @@
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/svcsock.h>
 #include <linux/lockd/lockd.h>
+#include <linux/lockd/sm_inter.h>
 #include <linux/nfs.h>
 
 #define NLMDBG_FACILITY		NLMDBG_SVC
@@ -385,6 +386,14 @@ static ctl_table nlm_sysctls[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "nsm_local_state",
+		.data		= &nsm_local_state,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
 
 	{ .ctl_name = 0 }
 };
Index: build/include/linux/lockd/sm_inter.h
===================================================================
--- build.orig/include/linux/lockd/sm_inter.h
+++ build/include/linux/lockd/sm_inter.h
@@ -42,6 +42,6 @@ struct nsm_res {
 
 int		nsm_monitor(struct nlm_host *);
 int		nsm_unmonitor(struct nlm_host *);
-extern u32	nsm_local_state;
+extern int	nsm_local_state;
 
 #endif /* LINUX_LOCKD_SM_INTER_H */

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