[PATCH v2 1/1] nfsd4: Expose the callback address and state of each NFS4 client

[Dave Wysochanski <dwysocha@redhat.com>]

In addition to the client's address, display the callback channel
state and address in the 'info' file.  Define and use a common
function for this information that can be used by both callback
trace events and the NFS4 client 'info' file.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
---
 fs/nfsd/nfs4state.c |  2 ++
 fs/nfsd/trace.c     | 15 +++++++++++++++
 fs/nfsd/trace.h     |  9 ++-------
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b2573d3ecd3c..f3b8221bb543 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2385,6 +2385,8 @@ static int client_info_show(struct seq_file *m, void *v)
 		seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
 			clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
 	}
+	seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
+	seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
 	drop_client(clp);
 
 	return 0;
diff --git a/fs/nfsd/trace.c b/fs/nfsd/trace.c
index f008b95ceec2..6291b5d10824 100644
--- a/fs/nfsd/trace.c
+++ b/fs/nfsd/trace.c
@@ -2,3 +2,18 @@
 
 #define CREATE_TRACE_POINTS
 #include "trace.h"
+
+const char *cb_state2str(const int state)
+{
+	switch (state) {
+	case NFSD4_CB_UP:
+		return "UP";
+	case NFSD4_CB_UNKNOWN:
+		return "UNKNOWN";
+	case NFSD4_CB_DOWN:
+		return "DOWN";
+	case NFSD4_CB_FAULT:
+		return "FAULT";
+	}
+	return "UNDEFINED";
+}
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 10cc3aaf1089..8908d48b2aa6 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -876,12 +876,7 @@
 	TP_printk("client %08x:%08x", __entry->cl_boot, __entry->cl_id)
 )
 
-#define show_cb_state(val)						\
-	__print_symbolic(val,						\
-		{ NFSD4_CB_UP,		"UP" },				\
-		{ NFSD4_CB_UNKNOWN,	"UNKNOWN" },			\
-		{ NFSD4_CB_DOWN,	"DOWN" },			\
-		{ NFSD4_CB_FAULT,	"FAULT"})
+const char *cb_state2str(const int state);
 
 DECLARE_EVENT_CLASS(nfsd_cb_class,
 	TP_PROTO(const struct nfs4_client *clp),
@@ -901,7 +896,7 @@
 	),
 	TP_printk("addr=%pISpc client %08x:%08x state=%s",
 		__entry->addr, __entry->cl_boot, __entry->cl_id,
-		show_cb_state(__entry->state))
+		cb_state2str(__entry->state))
 );
 
 #define DEFINE_NFSD_CB_EVENT(name)			\
-- 
1.8.3.1