stats.c

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/*
 * procfs-based user access to knfsd statistics
 *
 * /proc/net/rpc/nfsd
 *
 * Format:
 *  rc <hits> <misses> <nocache>
 *          Statistsics for the reply cache
 *  fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
 *          statistics for filehandle lookup
 *  io <bytes-read> <bytes-written>
 *          statistics for IO throughput
 *  th <threads> <fullcnt> <10%-20%> <20%-30%> ... <90%-100%> <100%> 
 *          time (seconds) when nfsd thread usage above thresholds
 *          and number of times that all threads were in use
 *  ra cache-size  <10%  <20%  <30% ... <100% not-found
 *          number of times that read-ahead entry was found that deep in
 *          the cache.
 *  plus generic RPC stats (see net/sunrpc/stats.c)
 *
 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <[email protected]>
 */

#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/sunrpc/stats.h>
#include <linux/nfsd/stats.h>
#include <net/net_namespace.h>

#include "nfsd.h"

struct nfsd_stats   nfsdstats;
struct svc_stat     nfsd_svcstats = {
    .program    = &nfsd_program,
};

static int nfsd_proc_show(struct seq_file *seq, void *v)
{
    int i;

    seq_printf(seq, "rc %u %u %u\nfh %u %u %u %u %u\nio %u %u\n",
              nfsdstats.rchits,
              nfsdstats.rcmisses,
              nfsdstats.rcnocache,
              nfsdstats.fh_stale,
              nfsdstats.fh_lookup,
              nfsdstats.fh_anon,
              nfsdstats.fh_nocache_dir,
              nfsdstats.fh_nocache_nondir,
              nfsdstats.io_read,
              nfsdstats.io_write);
    /* thread usage: */
    seq_printf(seq, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
    for (i=0; i<10; i++) {
        unsigned int jifs = nfsdstats.th_usage[i];
        unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
        seq_printf(seq, " %u.%03u", sec, msec);
    }

    /* newline and ra-cache */
    seq_printf(seq, "\nra %u", nfsdstats.ra_size);
    for (i=0; i<11; i++)
        seq_printf(seq, " %u", nfsdstats.ra_depth[i]);
    seq_putc(seq, '\n');
    
    /* show my rpc info */
    svc_seq_show(seq, &nfsd_svcstats);

#ifdef CONFIG_NFSD_V4
    /* Show count for individual nfsv4 operations */
    /* Writing operation numbers 0 1 2 also for maintaining uniformity */
    seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
    for (i = 0; i <= LAST_NFS4_OP; i++)
        seq_printf(seq, " %u", nfsdstats.nfs4_opcount[i]);

    seq_putc(seq, '\n');
#endif

    return 0;
}

static int nfsd_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, nfsd_proc_show, NULL);
}

static const struct file_operations nfsd_proc_fops = {
    .owner = THIS_MODULE,
    .open = nfsd_proc_open,
    .read  = seq_read,
    .llseek = seq_lseek,
    .release = single_release,
};

void
nfsd_stat_init(void)
{
    svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_fops);
}

void
nfsd_stat_shutdown(void)
{
    svc_proc_unregister(&init_net, "nfsd");
}