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
30 struct nfsd_stats nfsdstats;
31 struct svc_stat nfsd_svcstats = {
32 .program = &nfsd_program,
33 };
34
nfsd_proc_show(struct seq_file * seq,void * v)35 static int nfsd_proc_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", 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
nfsd_proc_open(struct inode * inode,struct file * file)75 static int nfsd_proc_open(struct inode *inode, struct file *file)
76 {
77 return single_open(file, nfsd_proc_show, NULL);
78 }
79
80 static const struct proc_ops nfsd_proc_ops = {
81 .proc_open = nfsd_proc_open,
82 .proc_read = seq_read,
83 .proc_lseek = seq_lseek,
84 .proc_release = single_release,
85 };
86
nfsd_percpu_counters_init(struct percpu_counter counters[],int num)87 int nfsd_percpu_counters_init(struct percpu_counter counters[], int num)
88 {
89 int i, err = 0;
90
91 for (i = 0; !err && i < num; i++)
92 err = percpu_counter_init(&counters[i], 0, GFP_KERNEL);
93
94 if (!err)
95 return 0;
96
97 for (; i > 0; i--)
98 percpu_counter_destroy(&counters[i-1]);
99
100 return err;
101 }
102
nfsd_percpu_counters_reset(struct percpu_counter counters[],int num)103 void nfsd_percpu_counters_reset(struct percpu_counter counters[], int num)
104 {
105 int i;
106
107 for (i = 0; i < num; i++)
108 percpu_counter_set(&counters[i], 0);
109 }
110
nfsd_percpu_counters_destroy(struct percpu_counter counters[],int num)111 void nfsd_percpu_counters_destroy(struct percpu_counter counters[], int num)
112 {
113 int i;
114
115 for (i = 0; i < num; i++)
116 percpu_counter_destroy(&counters[i]);
117 }
118
nfsd_stat_counters_init(void)119 static int nfsd_stat_counters_init(void)
120 {
121 return nfsd_percpu_counters_init(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
122 }
123
nfsd_stat_counters_destroy(void)124 static void nfsd_stat_counters_destroy(void)
125 {
126 nfsd_percpu_counters_destroy(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
127 }
128
nfsd_stat_init(void)129 int nfsd_stat_init(void)
130 {
131 int err;
132
133 err = nfsd_stat_counters_init();
134 if (err)
135 return err;
136
137 svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_ops);
138
139 return 0;
140 }
141
nfsd_stat_shutdown(void)142 void nfsd_stat_shutdown(void)
143 {
144 nfsd_stat_counters_destroy();
145 svc_proc_unregister(&init_net, "nfsd");
146 }
147