[PATCH] knfsd: 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>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 11 insertions, 2 deletions

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 709cf7c80545..e0179f8c327f 100644
--- a/fs/lockd/mon.c
+++ b/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
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index a3b7602cd383..634139232aaf 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -33,6 +33,7 @@
 #include <linux/sunrpc/svcsock.h>
 #include <net/ip.h>
 #include <linux/lockd/lockd.h>
+#include <linux/lockd/sm_inter.h>
 #include <linux/nfs.h>
 
 #define NLMDBG_FACILITY         NLMDBG_SVC
@@ -404,6 +405,14 @@ 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 }
 };
 
diff --git a/include/linux/lockd/sm_inter.h b/include/linux/lockd/sm_inter.h
index daef509bb9b3..fc61d40964da 100644
--- a/include/linux/lockd/sm_inter.h
+++ b/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 */