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>

fs/lockd/mon.c

@@ -214,12 +214,16 @@ static struct rpc_procinfo	nsm_procedures[] = {
 		.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",
 	},
 };
 

fs/lockd/xdr.c

@@ -546,7 +546,9 @@ nlmclt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 	.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[] = {

fs/lockd/xdr4.c

@@ -551,7 +551,9 @@ nlm4clt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 	.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[] = {

fs/nfs/mount_clnt.c

@@ -137,6 +137,8 @@ static struct rpc_procinfo	mnt_procedures[] = {
 	  .p_encode		= (kxdrproc_t) xdr_encode_dirpath,	
 	  .p_decode		= (kxdrproc_t) xdr_decode_fhstatus,
 	  .p_bufsiz		= MNT_dirpath_sz << 2,
+	  .p_statidx		= MNTPROC_MNT,
+	  .p_name		= "MOUNT",
 	},
 };
 
@@ -146,6 +148,8 @@ static struct rpc_procinfo mnt3_procedures[] = {
 	  .p_encode		= (kxdrproc_t) xdr_encode_dirpath,
 	  .p_decode		= (kxdrproc_t) xdr_decode_fhstatus3,
 	  .p_bufsiz		= MNT_dirpath_sz << 2,
+	  .p_statidx		= MOUNTPROC3_MNT,
+	  .p_name		= "MOUNT",
 	},
 };
 

fs/nfs/nfs2xdr.c

@@ -682,7 +682,9 @@ nfs_stat_to_errno(int stat)
 	.p_encode   =  (kxdrproc_t) nfs_xdr_##argtype,			\
 	.p_decode   =  (kxdrproc_t) nfs_xdr_##restype,			\
 	.p_bufsiz   =  MAX(NFS_##argtype##_sz,NFS_##restype##_sz) << 2,	\
-	.p_timer    =  timer						\
+	.p_timer    =  timer,						\
+	.p_statidx  =  NFSPROC_##proc,					\
+	.p_name     =  #proc,						\
 	}
 struct rpc_procinfo	nfs_procedures[] = {
     PROC(GETATTR,	fhandle,	attrstat, 1),

fs/nfs/nfs3xdr.c

@@ -1109,7 +1109,9 @@ nfs3_xdr_setaclres(struct rpc_rqst *req, u32 *p, struct nfs_fattr *fattr)
 	.p_encode    = (kxdrproc_t) nfs3_xdr_##argtype,			\
 	.p_decode    = (kxdrproc_t) nfs3_xdr_##restype,			\
 	.p_bufsiz    = MAX(NFS3_##argtype##_sz,NFS3_##restype##_sz) << 2,	\
-	.p_timer     = timer						\
+	.p_timer     = timer,						\
+	.p_statidx   = NFS3PROC_##proc,					\
+	.p_name      = #proc,						\
 	}
 
 struct rpc_procinfo	nfs3_procedures[] = {
@@ -1150,6 +1152,7 @@ static struct rpc_procinfo	nfs3_acl_procedures[] = {
 		.p_decode = (kxdrproc_t) nfs3_xdr_getaclres,
 		.p_bufsiz = MAX(ACL3_getaclargs_sz, ACL3_getaclres_sz) << 2,
 		.p_timer = 1,
+		.p_name = "GETACL",
 	},
 	[ACLPROC3_SETACL] = {
 		.p_proc = ACLPROC3_SETACL,
@@ -1157,6 +1160,7 @@ static struct rpc_procinfo	nfs3_acl_procedures[] = {
 		.p_decode = (kxdrproc_t) nfs3_xdr_setaclres,
 		.p_bufsiz = MAX(ACL3_setaclargs_sz, ACL3_setaclres_sz) << 2,
 		.p_timer = 0,
+		.p_name = "SETACL",
 	},
 };
 

fs/nfs/nfs4xdr.c

@@ -4344,6 +4344,8 @@ nfs_stat_to_errno(int stat)
 	.p_encode = (kxdrproc_t) nfs4_xdr_##argtype,		\
 	.p_decode = (kxdrproc_t) nfs4_xdr_##restype,		\
 	.p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2,	\
+	.p_statidx = NFSPROC4_CLNT_##proc,			\
+	.p_name   = #proc,					\
     }
 
 struct rpc_procinfo	nfs4_procedures[] = {

fs/nfsd/nfs4callback.c

@@ -326,6 +326,8 @@ nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, u32 *p)
         .p_encode = (kxdrproc_t) nfs4_xdr_##argtype,                    \
         .p_decode = (kxdrproc_t) nfs4_xdr_##restype,                    \
         .p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2,  \
+        .p_statidx = NFSPROC4_CB_##call,				\
+	.p_name   = #proc,                                              \
 }
 
 static struct rpc_procinfo     nfs4_cb_procedures[] = {

include/linux/sunrpc/clnt.h

@@ -101,6 +101,8 @@ struct rpc_procinfo {
 	unsigned int		p_bufsiz;	/* req. buffer size */
 	unsigned int		p_count;	/* call count */
 	unsigned int		p_timer;	/* Which RTT timer to use */
+	u32			p_statidx;	/* Which procedure to account */
+	char *			p_name;		/* name of procedure */
 };
 
 #define RPC_CONGESTED(clnt)	(RPCXPRT_CONGESTED((clnt)->cl_xprt))

net/sunrpc/pmap_clnt.c

@@ -261,6 +261,8 @@ static struct rpc_procinfo	pmap_procedures[] = {
 	  .p_decode		= (kxdrproc_t) xdr_decode_bool,
 	  .p_bufsiz		= 4,
 	  .p_count		= 1,
+	  .p_statidx		= PMAP_SET,
+	  .p_name		= "SET",
 	},
 [PMAP_UNSET] = {
 	  .p_proc		= PMAP_UNSET,
@@ -268,6 +270,8 @@ static struct rpc_procinfo	pmap_procedures[] = {
 	  .p_decode		= (kxdrproc_t) xdr_decode_bool,
 	  .p_bufsiz		= 4,
 	  .p_count		= 1,
+	  .p_statidx		= PMAP_UNSET,
+	  .p_name		= "UNSET",
 	},
 [PMAP_GETPORT] = {
 	  .p_proc		= PMAP_GETPORT,
@@ -275,6 +279,8 @@ static struct rpc_procinfo	pmap_procedures[] = {
 	  .p_decode		= (kxdrproc_t) xdr_decode_port,
 	  .p_bufsiz		= 4,
 	  .p_count		= 1,
+	  .p_statidx		= PMAP_GETPORT,
+	  .p_name		= "GETPORT",
 	},
 };
 

net/sunrpc/stats.c

@@ -151,7 +151,7 @@ void rpc_count_iostats(struct rpc_task *task)
 
 	if (!stats || !req)
 		return;
-	op_metrics = &stats[task->tk_msg.rpc_proc->p_proc];
+	op_metrics = &stats[task->tk_msg.rpc_proc->p_statidx];
 
 	op_metrics->om_ops++;
 	op_metrics->om_ntrans += req->rq_ntrans;
@@ -176,6 +176,16 @@ void rpc_count_iostats(struct rpc_task *task)
 	op_metrics->om_execute += execute;
 }
 
+void _print_name(struct seq_file *seq, unsigned int op, struct rpc_procinfo *procs)
+{
+	if (procs[op].p_name)
+		seq_printf(seq, "\t%12s: ", procs[op].p_name);
+	else if (op == 0)
+		seq_printf(seq, "\t        NULL: ");
+	else
+		seq_printf(seq, "\t%12u: ", op);
+}
+
 #define MILLISECS_PER_JIFFY	(1000UL / HZ)
 
 void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
@@ -197,7 +207,7 @@ void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
 	seq_printf(seq, "\tper-op statistics\n");
 	for (op = 0; op < maxproc; op++) {
 		struct rpc_iostats *metrics = &stats[op];
-		seq_printf(seq, "%12u: ", op);
+		_print_name(seq, op, clnt->cl_procinfo);
 		seq_printf(seq, "%lu %lu %lu %Lu %Lu %Lu %Lu %Lu\n",
 				metrics->om_ops,
 				metrics->om_ntrans,