fs/nfsd/stats.c

   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
  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
  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
  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
 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
 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
 119 static int nfsd_stat_counters_init(void)
 120 {
 121         return nfsd_percpu_counters_init(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
 122 }
 123
 124 static void nfsd_stat_counters_destroy(void)
 125 {
 126         nfsd_percpu_counters_destroy(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
 127 }
 128
 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
 142 void nfsd_stat_shutdown(void)
 143 {
 144         nfsd_stat_counters_destroy();
 145         svc_proc_unregister(&init_net, "nfsd");
 146 }