SUNRPC: display human-readable procedure name in rpc_iostats output

Add fields to the rpc_procinfo struct that allow the display of a
human-readable name for each procedure in the rpc_iostats output.

Also fix it so that the NFSv4 stats are broken up correctly by
sub-procedure number.  NFSv4 uses only two real RPC procedures:
NULL, and COMPOUND.

Test plan:
Mount with NFSv2, NFSv3, and NFSv4, and do "cat /proc/self/mountstats".

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 0edc03e..84ee39e 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -214,12 +214,16 @@
 		.p_encode	= (kxdrproc_t) xdr_encode_mon,
 		.p_decode	= (kxdrproc_t) xdr_decode_stat_res,
 		.p_bufsiz	= MAX(SM_mon_sz, SM_monres_sz) << 2,
+		.p_statidx	= SM_MON,
+		.p_name		= "MONITOR",
 	},
 [SM_UNMON] = {
 		.p_proc		= SM_UNMON,
 		.p_encode	= (kxdrproc_t) xdr_encode_unmon,
 		.p_decode	= (kxdrproc_t) xdr_decode_stat,
 		.p_bufsiz	= MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
+		.p_statidx	= SM_UNMON,
+		.p_name		= "UNMONITOR",
 	},
 };
 
diff --git a/fs/lockd/xdr.c b/fs/lockd/xdr.c
index 1e984ab..766ce06 100644
--- a/fs/lockd/xdr.c
+++ b/fs/lockd/xdr.c
@@ -546,7 +546,9 @@
 	.p_proc      = NLMPROC_##proc,					\
 	.p_encode    = (kxdrproc_t) nlmclt_encode_##argtype,		\
 	.p_decode    = (kxdrproc_t) nlmclt_decode_##restype,		\
-	.p_bufsiz    = MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2	\
+	.p_bufsiz    = MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2,	\
+	.p_statidx   = NLMPROC_##proc,					\
+	.p_name      = #proc,						\
 	}
 
 static struct rpc_procinfo	nlm_procedures[] = {
diff --git a/fs/lockd/xdr4.c b/fs/lockd/xdr4.c
index 906ddc2..36eb175 100644
--- a/fs/lockd/xdr4.c
+++ b/fs/lockd/xdr4.c
@@ -551,7 +551,9 @@
 	.p_proc      = NLMPROC_##proc,					\
 	.p_encode    = (kxdrproc_t) nlm4clt_encode_##argtype,		\
 	.p_decode    = (kxdrproc_t) nlm4clt_decode_##restype,		\
-	.p_bufsiz    = MAX(NLM4_##argtype##_sz, NLM4_##restype##_sz) << 2	\
+	.p_bufsiz    = MAX(NLM4_##argtype##_sz, NLM4_##restype##_sz) << 2,	\
+	.p_statidx   = NLMPROC_##proc,					\
+	.p_name      = #proc,						\
 	}
 
 static struct rpc_procinfo	nlm4_procedures[] = {