/*
 * Copyright (c) 1983, 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) Copyright (c) 1983, 1989, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)nfsstat.c        8.2 (Berkeley) 3/31/95
 * $FreeBSD: src/usr.bin/nfsstat/nfsstat.c,v 1.15.2.3 2001/06/06 20:25:58 tmm Exp $
 */

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <vfs/nfs/rpcv2.h>
#include <vfs/nfs/nfsproto.h>
#include <vfs/nfs/nfs.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <kvm.h>
#include <limits.h>
#include <nlist.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include <err.h>

static struct nlist nl[] = {
#define N_NFSSTAT       0
        { .n_name = "_nfsstats" },
        { .n_name = "" },
};
static kvm_t *kd;

static int deadkernel = 0;
static int widemode = 0;

static void intpr(int, int);
static void printhdr(int, int);
static void sidewaysintpr(u_int, int, int) __dead2;
static void usage(void) __dead2;
static char *sperc1(int, int);
static char *sperc2(int, int);

#define DELTA(field)    (nfsstats.field - lastst.field)

int
main(int argc, char **argv)
{
        u_int interval;
        int clientOnly = -1;
        int serverOnly = -1;
        int ch;
        char *memf, *nlistf;
        char errbuf[_POSIX2_LINE_MAX];

        interval = 0;
        memf = nlistf = NULL;
        while ((ch = getopt(argc, argv, "csWM:N:w:")) != -1)
                switch(ch) {
                case 'M':
                        memf = optarg;
                        break;
                case 'N':
                        nlistf = optarg;
                        break;
                case 'W':
                        widemode = 1;
                        break;
                case 'w':
                        interval = atoi(optarg);
                        break;
                case 'c':
                        clientOnly = 1;
                        if (serverOnly < 0)
                                serverOnly = 0;
                        break;
                case 's':
                        serverOnly = 1;
                        if (clientOnly < 0)
                                clientOnly = 0;
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

#define BACKWARD_COMPATIBILITY
#ifdef  BACKWARD_COMPATIBILITY
        if (*argv) {
                interval = atoi(*argv);
                if (*++argv) {
                        nlistf = *argv;
                        if (*++argv)
                                memf = *argv;
                }
        }
#endif
        if (nlistf != NULL || memf != NULL) {
                deadkernel = 1;

                if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY,
                                        errbuf)) == NULL) {
                        errx(1, "kvm_openfiles: %s", errbuf);
                }
                if (kvm_nlist(kd, nl) != 0) {
                        errx(1, "kvm_nlist: can't get names");
                }
        }

        if (interval)
                sidewaysintpr(interval, clientOnly, serverOnly);
        else
                intpr(clientOnly, serverOnly);
        exit(0);
}

/*
 * Read the nfs stats using sysctl(3) for live kernels, or kvm_read
 * for dead ones.
 */
static void
readstats(struct nfsstats *stp)
{
        if(deadkernel) {
                if(kvm_read(kd, (u_long)nl[N_NFSSTAT].n_value, stp,
                            sizeof *stp) < 0) {
                        err(1, "kvm_read");
                }
        } else {
                int name[3];
                size_t buflen = sizeof *stp;
                struct vfsconf vfc;

                if (getvfsbyname("nfs", &vfc) < 0)
                        err(1, "getvfsbyname: NFS not compiled into kernel");
                name[0] = CTL_VFS;
                name[1] = vfc.vfc_typenum;
                name[2] = NFS_NFSSTATS;
                if (sysctl(name, 3, stp, &buflen, NULL, (size_t)0) < 0) {
                        err(1, "sysctl");
                }
        }
}

/*
 * Print a description of the nfs stats.
 */
static void
intpr(int clientOnly, int serverOnly)
{
        struct nfsstats nfsstats;

        readstats(&nfsstats);

        if (clientOnly) {
                printf("Client Info:\n");
                printf("Rpc Counts:\n");
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "Getattr", "Setattr", "Lookup", "Readlink", "Read",
                        "Write", "Create", "Remove");
                printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
                        nfsstats.rpccnt[NFSPROC_GETATTR],
                        nfsstats.rpccnt[NFSPROC_SETATTR],
                        nfsstats.rpccnt[NFSPROC_LOOKUP],
                        nfsstats.rpccnt[NFSPROC_READLINK],
                        nfsstats.rpccnt[NFSPROC_READ],
                        nfsstats.rpccnt[NFSPROC_WRITE],
                        nfsstats.rpccnt[NFSPROC_CREATE],
                        nfsstats.rpccnt[NFSPROC_REMOVE]);
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "Rename", "Link", "Symlink", "Mkdir", "Rmdir",
                        "Readdir", "RdirPlus", "Access");
                printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
                        nfsstats.rpccnt[NFSPROC_RENAME],
                        nfsstats.rpccnt[NFSPROC_LINK],
                        nfsstats.rpccnt[NFSPROC_SYMLINK],
                        nfsstats.rpccnt[NFSPROC_MKDIR],
                        nfsstats.rpccnt[NFSPROC_RMDIR],
                        nfsstats.rpccnt[NFSPROC_READDIR],
                        nfsstats.rpccnt[NFSPROC_READDIRPLUS],
                        nfsstats.rpccnt[NFSPROC_ACCESS]);
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "Mknod", "Fsstat", "Fsinfo", "PathConf", "Commit",
                        "GLease", "Vacate", "Evict");
                printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
                        nfsstats.rpccnt[NFSPROC_MKNOD],
                        nfsstats.rpccnt[NFSPROC_FSSTAT],
                        nfsstats.rpccnt[NFSPROC_FSINFO],
                        nfsstats.rpccnt[NFSPROC_PATHCONF],
                        nfsstats.rpccnt[NFSPROC_COMMIT],
                        nfsstats.rpccnt[NQNFSPROC_GETLEASE],
                        nfsstats.rpccnt[NQNFSPROC_VACATED],
                        nfsstats.rpccnt[NQNFSPROC_EVICTED]);
                printf("Rpc Info:\n");
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "TimedOut", "Invalid", "X Replies", "Retries", 
                        "Requests");
                printf("%9d %9d %9d %9d %9d\n",
                        nfsstats.rpctimeouts,
                        nfsstats.rpcinvalid,
                        nfsstats.rpcunexpected,
                        nfsstats.rpcretries,
                        nfsstats.rpcrequests);
                printf("Cache Info:\n");
                printf("%9.9s %9.9s %9.9s %9.9s",
                        "Attr Hits", "Misses", "Lkup Hits", "Misses");
                printf(" %9.9s %9.9s %9.9s %9.9s\n",
                        "BioR Hits", "Misses", "BioW Hits", "Misses");
                printf("%9d %9d %9d %9d",
                        nfsstats.attrcache_hits, nfsstats.attrcache_misses,
                        nfsstats.lookupcache_hits, nfsstats.lookupcache_misses);
                printf(" %9d %9d %9d %9d\n",
                        nfsstats.biocache_reads-nfsstats.read_bios,
                        nfsstats.read_bios,
                        nfsstats.biocache_writes-nfsstats.write_bios,
                        nfsstats.write_bios);
                printf("%9.9s %9.9s %9.9s %9.9s",
                        "BioRLHits", "Misses", "BioD Hits", "Misses");
                printf(" %9.9s %9.9s\n", "DirE Hits", "Misses");
                printf("%9d %9d %9d %9d",
                        nfsstats.biocache_readlinks-nfsstats.readlink_bios,
                        nfsstats.readlink_bios,
                        nfsstats.biocache_readdirs-nfsstats.readdir_bios,
                        nfsstats.readdir_bios);
                printf(" %9d %9d\n",
                        nfsstats.direofcache_hits, nfsstats.direofcache_misses);
        }
        if (serverOnly) {
                printf("\nServer Info:\n");
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "Getattr", "Setattr", "Lookup", "Readlink", "Read",
                        "Write", "Create", "Remove");
                printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
                        nfsstats.srvrpccnt[NFSPROC_GETATTR],
                        nfsstats.srvrpccnt[NFSPROC_SETATTR],
                        nfsstats.srvrpccnt[NFSPROC_LOOKUP],
                        nfsstats.srvrpccnt[NFSPROC_READLINK],
                        nfsstats.srvrpccnt[NFSPROC_READ],
                        nfsstats.srvrpccnt[NFSPROC_WRITE],
                        nfsstats.srvrpccnt[NFSPROC_CREATE],
                        nfsstats.srvrpccnt[NFSPROC_REMOVE]);
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "Rename", "Link", "Symlink", "Mkdir", "Rmdir",
                        "Readdir", "RdirPlus", "Access");
                printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
                        nfsstats.srvrpccnt[NFSPROC_RENAME],
                        nfsstats.srvrpccnt[NFSPROC_LINK],
                        nfsstats.srvrpccnt[NFSPROC_SYMLINK],
                        nfsstats.srvrpccnt[NFSPROC_MKDIR],
                        nfsstats.srvrpccnt[NFSPROC_RMDIR],
                        nfsstats.srvrpccnt[NFSPROC_READDIR],
                        nfsstats.srvrpccnt[NFSPROC_READDIRPLUS],
                        nfsstats.srvrpccnt[NFSPROC_ACCESS]);
                printf("%9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s %9.9s\n",
                        "Mknod", "Fsstat", "Fsinfo", "PathConf", "Commit",
                        "GLease", "Vacate", "Evict");
                printf("%9d %9d %9d %9d %9d %9d %9d %9d\n",
                        nfsstats.srvrpccnt[NFSPROC_MKNOD],
                        nfsstats.srvrpccnt[NFSPROC_FSSTAT],
                        nfsstats.srvrpccnt[NFSPROC_FSINFO],
                        nfsstats.srvrpccnt[NFSPROC_PATHCONF],
                        nfsstats.srvrpccnt[NFSPROC_COMMIT],
                        nfsstats.srvrpccnt[NQNFSPROC_GETLEASE],
                        nfsstats.srvrpccnt[NQNFSPROC_VACATED],
                        nfsstats.srvrpccnt[NQNFSPROC_EVICTED]);
                printf("Server Ret-Failed\n");
                printf("%17d\n", nfsstats.srvrpc_errs);
                printf("Server Faults\n");
                printf("%13d\n", nfsstats.srv_errs);
                printf("Server Cache Stats:\n");
                printf("%9.9s %9.9s %9.9s %9.9s\n",
                        "Inprog", "Idem", "Non-idem", "Misses");
                printf("%9d %9d %9d %9d\n",
                        nfsstats.srvcache_inproghits,
                        nfsstats.srvcache_idemdonehits,
                        nfsstats.srvcache_nonidemdonehits,
                        nfsstats.srvcache_misses);
                printf("Server Lease Stats:\n");
                printf("%9.9s %9.9s %9.9s\n",
                "Leases", "PeakL", "GLeases");
                printf("%9d %9d %9d\n",
                        nfsstats.srvnqnfs_leases,
                        nfsstats.srvnqnfs_maxleases,
                        nfsstats.srvnqnfs_getleases);
                printf("Server Write Gathering:\n");
                printf("%9.9s %9.9s %9.9s\n",
                        "WriteOps", "WriteRPC", "Opsaved");
                printf("%9d %9d %9d\n",
                        nfsstats.srvvop_writes,
                        nfsstats.srvrpccnt[NFSPROC_WRITE],
                        nfsstats.srvrpccnt[NFSPROC_WRITE] - 
                            nfsstats.srvvop_writes);
        }
}

/*
 * Print a running summary of nfs statistics.
 * Repeat display every interval seconds, showing statistics
 * collected over that interval.  Assumes that interval is non-zero.
 * First line printed at top of screen is always cumulative.
 */
static void
sidewaysintpr(u_int interval, int clientOnly, int serverOnly)
{
        struct nfsstats nfsstats, lastst;
        int hdrcnt = 1;

        readstats(&lastst);
        sleep(interval);

        for (;;) {
                readstats(&nfsstats);

                if (--hdrcnt == 0) {
                        printhdr(clientOnly, serverOnly);
                        if (clientOnly && serverOnly)
                                hdrcnt = 10;
                        else
                                hdrcnt = 20;
                }
                if (clientOnly) {
                    printf("%s %6d %6d %6d %6d %6d %6d %6d %6d",
                        ((clientOnly && serverOnly) ? "Client:" : ""),
                        DELTA(attrcache_hits) + DELTA(attrcache_misses),
                        DELTA(lookupcache_hits) + DELTA(lookupcache_misses),
                        DELTA(biocache_readlinks),
                        DELTA(biocache_reads),
                        DELTA(biocache_writes),
                        nfsstats.rpccnt[NFSPROC_RENAME]-lastst.rpccnt[NFSPROC_RENAME],
                        DELTA(accesscache_hits) + DELTA(accesscache_misses),
                        DELTA(biocache_readdirs)
                    );
                    if (widemode) {
                            printf(" %s %s %s %s %s %s",
                                sperc1(DELTA(attrcache_hits),
                                    DELTA(attrcache_misses)),
                                sperc1(DELTA(lookupcache_hits), 
                                    DELTA(lookupcache_misses)),
                                sperc2(DELTA(biocache_reads),
                                    DELTA(read_bios)),
                                sperc2(DELTA(biocache_writes),
                                    DELTA(write_bios)),
                                sperc1(DELTA(accesscache_hits),
                                    DELTA(accesscache_misses)),
                                sperc2(DELTA(biocache_readdirs),
                                    DELTA(readdir_bios))
                            );
                    }
                    printf("\n");
                }
                if (serverOnly) {
                    printf("%s %6d %6d %6d %6d %6d %6d %6d %6d",
                        ((clientOnly && serverOnly) ? "Server:" : ""),
                        nfsstats.srvrpccnt[NFSPROC_GETATTR]-lastst.srvrpccnt[NFSPROC_GETATTR],
                        nfsstats.srvrpccnt[NFSPROC_LOOKUP]-lastst.srvrpccnt[NFSPROC_LOOKUP],
                        nfsstats.srvrpccnt[NFSPROC_READLINK]-lastst.srvrpccnt[NFSPROC_READLINK],
                        nfsstats.srvrpccnt[NFSPROC_READ]-lastst.srvrpccnt[NFSPROC_READ],
                        nfsstats.srvrpccnt[NFSPROC_WRITE]-lastst.srvrpccnt[NFSPROC_WRITE],
                        nfsstats.srvrpccnt[NFSPROC_RENAME]-lastst.srvrpccnt[NFSPROC_RENAME],
                        nfsstats.srvrpccnt[NFSPROC_ACCESS]-lastst.srvrpccnt[NFSPROC_ACCESS],
                        (nfsstats.srvrpccnt[NFSPROC_READDIR]-lastst.srvrpccnt[NFSPROC_READDIR])
                        +(nfsstats.srvrpccnt[NFSPROC_READDIRPLUS]-lastst.srvrpccnt[NFSPROC_READDIRPLUS]));
                    printf("\n");
                }
                lastst = nfsstats;
                fflush(stdout);
                sleep(interval);
        }
        /*NOTREACHED*/
}

static void
printhdr(int clientOnly, int serverOnly)
{
        printf("%s%6.6s %6.6s %6.6s %6.6s %6.6s %6.6s %6.6s %6.6s",
            ((serverOnly && clientOnly) ? "        " : " "),
            "GtAttr", "Lookup", "Rdlink", "Read", "Write", "Rename",
            "Access", "Rddir");
        if (widemode && clientOnly) {
                printf(" Attr Lkup BioR BioW Accs BioD");
        }
        printf("\n");
        fflush(stdout);
}

static void
usage(void)
{
        (void)fprintf(stderr,
            "usage: nfsstat [-csW] [-M core] [-N system] [-w interval]\n");
        exit(1);
}

static char SPBuf[64][8];
static int SPIndex;

static char * 
sperc1(int hits, int misses)
{
        char *p = SPBuf[SPIndex];

        if (hits + misses) {
                sprintf(p, "%3d%%", 
                    (int)(char)((quad_t)hits * 100 / (hits + misses)));
        } else {
                sprintf(p, "   -");
        }
        SPIndex = (SPIndex + 1) & 63;
        return(p);
}

static char * 
sperc2(int ttl, int misses)
{
        char *p = SPBuf[SPIndex];

        if (ttl) {
                sprintf(p, "%3d%%",
                    (int)(char)((quad_t)(ttl - misses) * 100 / ttl));
        } else {
                sprintf(p, "   -");
        }
        SPIndex = (SPIndex + 1) & 63;
        return(p);
}