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", 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 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 } 147