// SPDX-License-Identifier: GPL-2.0
/*
 * procfs-based user access to knfsd statistics
 *
 * /proc/net/rpc/nfsd
 *
 * Format:
 *      rc <hits> <misses> <nocache>
 *                      Statistsics for the reply cache
 *      fh <stale> <deprecated filehandle cache stats>
 *                      statistics for filehandle lookup
 *      io <bytes-read> <bytes-written>
 *                      statistics for IO throughput
 *      th <threads> <deprecated thread usage histogram stats>
 *                      number of threads
 *      ra <deprecated ra-cache stats>
 *
 *      plus generic RPC stats (see net/sunrpc/stats.c)
 *
 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
 */

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

#include "nfsd.h"

static int nfsd_show(struct seq_file *seq, void *v)
{
        struct net *net = pde_data(file_inode(seq->file));
        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
        int i;

        seq_printf(seq, "rc %lld %lld %lld\nfh %lld 0 0 0 0\nio %lld %lld\n",
                   percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_HITS]),
                   percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_MISSES]),
                   percpu_counter_sum_positive(&nn->counter[NFSD_STATS_RC_NOCACHE]),
                   percpu_counter_sum_positive(&nn->counter[NFSD_STATS_FH_STALE]),
                   percpu_counter_sum_positive(&nn->counter[NFSD_STATS_IO_READ]),
                   percpu_counter_sum_positive(&nn->counter[NFSD_STATS_IO_WRITE]));

        /* thread usage: */
        seq_printf(seq, "th %u 0", atomic_read(&nfsd_th_cnt));

        /* deprecated thread usage histogram stats */
        for (i = 0; i < 10; i++)
                seq_puts(seq, " 0.000");

        /* deprecated ra-cache stats */
        seq_puts(seq, "\nra 0 0 0 0 0 0 0 0 0 0 0 0\n");

        /* show my rpc info */
        svc_seq_show(seq, &nn->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, " %lld",
                           percpu_counter_sum_positive(&nn->counter[NFSD_STATS_NFS4_OP(i)]));
        }
        seq_printf(seq, "\nwdeleg_getattr %lld",
                percpu_counter_sum_positive(&nn->counter[NFSD_STATS_WDELEG_GETATTR]));

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

        return 0;
}

DEFINE_PROC_SHOW_ATTRIBUTE(nfsd);

struct proc_dir_entry *nfsd_proc_stat_init(struct net *net)
{
        struct nfsd_net *nn = net_generic(net, nfsd_net_id);

        return svc_proc_register(net, &nn->nfsd_svcstats, &nfsd_proc_ops);
}

void nfsd_proc_stat_shutdown(struct net *net)
{
        svc_proc_unregister(net, "nfsd");
}