Linux kernel mirror (for testing)
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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(seq, "rc %lld %lld %lld\nfh %lld 0 0 0 0\nio %lld %lld\n",
40 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_HITS]),
41 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_MISSES]),
42 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_NOCACHE]),
43 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_FH_STALE]),
44 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_READ]),
45 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_WRITE]));
46
47 /* thread usage: */
48 seq_printf(seq, "th %u 0", atomic_read(&nfsdstats.th_cnt));
49
50 /* deprecated thread usage histogram stats */
51 for (i = 0; i < 10; i++)
52 seq_puts(seq, " 0.000");
53
54 /* deprecated ra-cache stats */
55 seq_puts(seq, "\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(seq,"proc4ops %u", LAST_NFS4_OP + 1);
64 for (i = 0; i <= LAST_NFS4_OP; i++) {
65 seq_printf(seq, " %lld",
66 percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_NFS4_OP(i)]));
67 }
68
69 seq_putc(seq, '\n');
70#endif
71
72 return 0;
73}
74
75DEFINE_PROC_SHOW_ATTRIBUTE(nfsd);
76
77int nfsd_percpu_counters_init(struct percpu_counter counters[], int num)
78{
79 int i, err = 0;
80
81 for (i = 0; !err && i < num; i++)
82 err = percpu_counter_init(&counters[i], 0, GFP_KERNEL);
83
84 if (!err)
85 return 0;
86
87 for (; i > 0; i--)
88 percpu_counter_destroy(&counters[i-1]);
89
90 return err;
91}
92
93void nfsd_percpu_counters_reset(struct percpu_counter counters[], int num)
94{
95 int i;
96
97 for (i = 0; i < num; i++)
98 percpu_counter_set(&counters[i], 0);
99}
100
101void nfsd_percpu_counters_destroy(struct percpu_counter counters[], int num)
102{
103 int i;
104
105 for (i = 0; i < num; i++)
106 percpu_counter_destroy(&counters[i]);
107}
108
109static int nfsd_stat_counters_init(void)
110{
111 return nfsd_percpu_counters_init(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
112}
113
114static void nfsd_stat_counters_destroy(void)
115{
116 nfsd_percpu_counters_destroy(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
117}
118
119int nfsd_stat_init(void)
120{
121 int err;
122
123 err = nfsd_stat_counters_init();
124 if (err)
125 return err;
126
127 svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_ops);
128
129 return 0;
130}
131
132void nfsd_stat_shutdown(void)
133{
134 nfsd_stat_counters_destroy();
135 svc_proc_unregister(&init_net, "nfsd");
136}