1 /*
2  * procfs-based user access to knfsd statistics
3  *
4  * /proc/net/rpc/nfsd
5  *
6  * Format:
7  *	rc <hits> <misses> <nocache>
8  *			Statistsics for the reply cache
9  *	fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
10  *			statistics for filehandle lookup
11  *	io <bytes-read> <bytes-written>
12  *			statistics for IO throughput
13  *	th <threads> <fullcnt> <10%-20%> <20%-30%> ... <90%-100%> <100%>
14  *			time (seconds) when nfsd thread usage above thresholds
15  *			and number of times that all threads were in use
16  *	ra cache-size  <10%  <20%  <30% ... <100% not-found
17  *			number of times that read-ahead entry was found that deep in
18  *			the cache.
19  *	plus generic RPC stats (see net/sunrpc/stats.c)
20  *
21  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
22  */
23 
24 #include <linux/seq_file.h>
25 #include <linux/module.h>
26 #include <linux/sunrpc/stats.h>
27 #include <linux/nfsd/stats.h>
28 #include <net/net_namespace.h>
29 
30 #include "nfsd.h"
31 
32 struct nfsd_stats	nfsdstats;
33 struct svc_stat		nfsd_svcstats = {
34 	.program	= &nfsd_program,
35 };
36 
nfsd_proc_show(struct seq_file * seq,void * v)37 static int nfsd_proc_show(struct seq_file *seq, void *v)
38 {
39 	int i;
40 
41 	seq_printf(seq, "rc %u %u %u\nfh %u %u %u %u %u\nio %u %u\n",
42 		      nfsdstats.rchits,
43 		      nfsdstats.rcmisses,
44 		      nfsdstats.rcnocache,
45 		      nfsdstats.fh_stale,
46 		      nfsdstats.fh_lookup,
47 		      nfsdstats.fh_anon,
48 		      nfsdstats.fh_nocache_dir,
49 		      nfsdstats.fh_nocache_nondir,
50 		      nfsdstats.io_read,
51 		      nfsdstats.io_write);
52 	/* thread usage: */
53 	seq_printf(seq, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
54 	for (i=0; i<10; i++) {
55 		unsigned int jifs = nfsdstats.th_usage[i];
56 		unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
57 		seq_printf(seq, " %u.%03u", sec, msec);
58 	}
59 
60 	/* newline and ra-cache */
61 	seq_printf(seq, "\nra %u", nfsdstats.ra_size);
62 	for (i=0; i<11; i++)
63 		seq_printf(seq, " %u", nfsdstats.ra_depth[i]);
64 	seq_putc(seq, '\n');
65 
66 	/* show my rpc info */
67 	svc_seq_show(seq, &nfsd_svcstats);
68 
69 #ifdef CONFIG_NFSD_V4
70 	/* Show count for individual nfsv4 operations */
71 	/* Writing operation numbers 0 1 2 also for maintaining uniformity */
72 	seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
73 	for (i = 0; i <= LAST_NFS4_OP; i++)
74 		seq_printf(seq, " %u", nfsdstats.nfs4_opcount[i]);
75 
76 	seq_putc(seq, '\n');
77 #endif
78 
79 	return 0;
80 }
81 
nfsd_proc_open(struct inode * inode,struct file * file)82 static int nfsd_proc_open(struct inode *inode, struct file *file)
83 {
84 	return single_open(file, nfsd_proc_show, NULL);
85 }
86 
87 static const struct file_operations nfsd_proc_fops = {
88 	.owner = THIS_MODULE,
89 	.open = nfsd_proc_open,
90 	.read  = seq_read,
91 	.llseek = seq_lseek,
92 	.release = single_release,
93 };
94 
95 void
nfsd_stat_init(void)96 nfsd_stat_init(void)
97 {
98 	svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_fops);
99 }
100 
101 void
nfsd_stat_shutdown(void)102 nfsd_stat_shutdown(void)
103 {
104 	svc_proc_unregister(&init_net, "nfsd");
105 }
106