/*
 * 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);
}