1// SPDX-License-Identifier: GPL-2.0
2/*
3 * procfs-based user access to knfsd statistics
4 *
5 * /proc/net/rpc/nfsd
6 *
7 * Format:
8 * rc <hits> <misses> <nocache>
9 * Statistsics for the reply cache
10 * fh <stale> <deprecated filehandle cache stats>
11 * statistics for filehandle lookup
12 * io <bytes-read> <bytes-written>
13 * statistics for IO throughput
14 * th <threads> <deprecated thread usage histogram stats>
15 * number of threads
16 * ra <deprecated ra-cache stats>
17 *
18 * plus generic RPC stats (see net/sunrpc/stats.c)
19 *
20 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
21 */
22
23#include <linux/seq_file.h>
24#include <linux/module.h>
25#include <linux/sunrpc/stats.h>
26#include <net/net_namespace.h>
27
28#include "nfsd.h"
29
30struct nfsd_stats nfsdstats;
31struct svc_stat nfsd_svcstats = {
32 .program = &nfsd_program,
33};
34
35static int nfsd_show(struct seq_file *seq, void *v)
36{
37 int i;
38
39 seq_printf(m: seq, fmt: "rc %lld %lld %lld\nfh %lld 0 0 0 0\nio %lld %lld\n",
40 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_RC_HITS]),
41 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_RC_MISSES]),
42 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_RC_NOCACHE]),
43 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_FH_STALE]),
44 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_IO_READ]),
45 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_IO_WRITE]));
46
47 /* thread usage: */
48 seq_printf(m: seq, fmt: "th %u 0", atomic_read(v: &nfsdstats.th_cnt));
49
50 /* deprecated thread usage histogram stats */
51 for (i = 0; i < 10; i++)
52 seq_puts(m: seq, s: " 0.000");
53
54 /* deprecated ra-cache stats */
55 seq_puts(m: seq, s: "\nra 0 0 0 0 0 0 0 0 0 0 0 0\n");
56
57 /* show my rpc info */
58 svc_seq_show(seq, &nfsd_svcstats);
59
60#ifdef CONFIG_NFSD_V4
61 /* Show count for individual nfsv4 operations */
62 /* Writing operation numbers 0 1 2 also for maintaining uniformity */
63 seq_printf(m: seq, fmt: "proc4ops %u", LAST_NFS4_OP + 1);
64 for (i = 0; i <= LAST_NFS4_OP; i++) {
65 seq_printf(m: seq, fmt: " %lld",
66 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_NFS4_OP(i)]));
67 }
68 seq_printf(m: seq, fmt: "\nwdeleg_getattr %lld",
69 percpu_counter_sum_positive(fbc: &nfsdstats.counter[NFSD_STATS_WDELEG_GETATTR]));
70
71 seq_putc(m: seq, c: '\n');
72#endif
73
74 return 0;
75}
76
77DEFINE_PROC_SHOW_ATTRIBUTE(nfsd);
78
79int nfsd_percpu_counters_init(struct percpu_counter *counters, int num)
80{
81 int i, err = 0;
82
83 for (i = 0; !err && i < num; i++)
84 err = percpu_counter_init(&counters[i], 0, GFP_KERNEL);
85
86 if (!err)
87 return 0;
88
89 for (; i > 0; i--)
90 percpu_counter_destroy(fbc: &counters[i-1]);
91
92 return err;
93}
94
95void nfsd_percpu_counters_reset(struct percpu_counter counters[], int num)
96{
97 int i;
98
99 for (i = 0; i < num; i++)
100 percpu_counter_set(fbc: &counters[i], amount: 0);
101}
102
103void nfsd_percpu_counters_destroy(struct percpu_counter counters[], int num)
104{
105 int i;
106
107 for (i = 0; i < num; i++)
108 percpu_counter_destroy(fbc: &counters[i]);
109}
110
111static int nfsd_stat_counters_init(void)
112{
113 return nfsd_percpu_counters_init(counters: nfsdstats.counter, num: NFSD_STATS_COUNTERS_NUM);
114}
115
116static void nfsd_stat_counters_destroy(void)
117{
118 nfsd_percpu_counters_destroy(counters: nfsdstats.counter, num: NFSD_STATS_COUNTERS_NUM);
119}
120
121int nfsd_stat_init(void)
122{
123 int err;
124
125 err = nfsd_stat_counters_init();
126 if (err)
127 return err;
128
129 svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_ops);
130
131 return 0;
132}
133
134void nfsd_stat_shutdown(void)
135{
136 nfsd_stat_counters_destroy();
137 svc_proc_unregister(&init_net, "nfsd");
138}
139

source code of linux/fs/nfsd/stats.c