[linux-cifs-client] [PATCH 2/2]: Utility program to dump cifs Debug data and Statistics

[Suresh Jayaraman]

This patch provides a utility program that allows to display
cifs debug data (active sessions and shares) and statistics
that are available in /proc/fs/cifs.

Signed-off-by: Suresh Jayaraman <sjayaraman at suse.de>
---

/*
 * cifsinfo.c - Dump cifs statistics from /proc/fs/cifs.
 *
 * Copyright (C) 2008 Suresh Jayaraman (sjayaraman at suse.de)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#define CIFS_DEBUGDATA	"/proc/fs/cifs/DebugData"
#define CIFS_STATS	"/proc/fs/cifs/Stats"
#define BUFLEN		4096

static char *progname;

static void usage(void)
{
	fprintf(stderr,
		"Usage: %s [OPTION]\n"
		"OPTIONS:\n"
		"\t-d\tShow cifs debug data\n"
		"\t-s\tShow cifs statistics\n"
		"\t-h\tShow help information\n",
		progname);

	exit(1);
}

/*Just dump, don't pretty-format as it is already formatted */
static int dump_info(char *file)
{
	FILE *fp;
	char buf[BUFLEN];

	fp = fopen(file, "r");
	if (fp != NULL) {
		while ((fgets(buf, sizeof(buf), fp)) != NULL)
			fprintf(stdout, "%s", buf);
		fclose(fp);
	} else if (errno == ENOENT) {
		fprintf(stderr, "%s: failed to open %s : %s\n", progname, file,
				strerror(errno));
		fprintf(stderr, "Hint: Check whether cifs module is loaded\n");
		exit(1);
	} else {
		fprintf(stderr, "%s: failed to open %s: %s\n", progname, file,
				strerror(errno));
		exit(1);
	}

	return 0;
}


int main(int argc, char *argv[])
{
	int i;
	int opt;

	progname = argv[0];
	if (argc != 2)
		usage();

	while ((opt = getopt(argc, argv, "dsh")) != -1) {
		switch (opt) {
		case 'd':
			if (dump_info(CIFS_DEBUGDATA) != 0)
				return -1;
			break;
		case 's':
			if (dump_info(CIFS_STATS) != 0)
				return -1;
			break;
		case 'h':
			usage();
		case '?':
			fprintf(stderr, "Try `%s -h' for more information.\n",
					progname);
			return -1;
		default:
			usage();
		}
	}

	for (i = optind; i < argc; i++) {
		fprintf(stderr, "%s: invalid option %s\n", progname, argv[i]);
		fprintf(stderr, "Try `%s -h' for more information.\n", progname);
		return -1;
	}

	exit(0);
}