lustre/utils/lshowmount.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/utils/lshowmount.h
  37  *
  38  * Author: Herb Wartens <wartens2@llnl.gov>
  39  * Author: Jim Garlick <garlick@llnl.gov>
  40  */
  41
  42 #ifndef _GNU_SOURCE
  43 #define _GNU_SOURCE
  44 #endif
  45
  46 #include <stdlib.h>
  47 #include <stdio.h>
  48 #include <unistd.h>
  49 #include <getopt.h>
  50 #include <dirent.h>
  51 #include <string.h>
  52 #include <sys/stat.h>
  53 #include <fcntl.h>
  54 #include <arpa/inet.h>
  55 #include <netdb.h>
  56 #include <errno.h>
  57 #include <libgen.h>
  58
  59 #include "nidlist.h"
  60
  61 #define PROC_DIRS {                     \
  62         "/proc/fs/lustre/mgs",          \
  63         "/proc/fs/lustre/mdt",          \
  64         "/proc/fs/lustre/obdfilter",    \
  65         NULL,                           \
  66 }
  67 #define PROC_EXPORTS_TMPL       "%s/%s/exports"
  68 #define PROC_UUID_TMPL          "%s/%s/uuid"
  69
  70 static void print_nids(NIDList nidlist, int lookup, int enumerate, int indent);
  71 static int lshowmount(int lookup, int enumerate, int verbose);
  72 static void read_exports(char *exports, NIDList nidlist);
  73
  74 char *prog;
  75
  76 #define OPTIONS "ehlv"
  77 static struct option long_options[] = {
  78         {"enumerate", no_argument, 0, 'e'},
  79         {"help",      no_argument, 0, 'h'},
  80         {"lookup",    no_argument, 0, 'l'},
  81         {"verbose",   no_argument, 0, 'v'},
  82         {0, 0, 0, 0},
  83 };
  84
  85 static void usage(void)
  86 {
  87         fprintf(stderr, "usage: %s [-e] [-h] [-l] [-v]\n", prog);
  88         exit(1);
  89 }
  90
  91 int main(int argc, char **argv)
  92 {
  93         int opt, optidx = 0;
  94         int lopt = 0;
  95         int vopt = 0;
  96         int eopt = 0;
  97
  98         prog = basename(argv[0]);
  99
 100         while ((opt = getopt_long(argc, argv, OPTIONS, long_options, &optidx)) != -1) {
 101                 switch (opt) {
 102                         case 'e':       /* --enumerate */
 103                                 eopt = 1;
 104                                 break;
 105                         case 'l':       /* --lookup */
 106                                 lopt = 1;
 107                                 break;
 108                         case 'v':       /* --verbose */
 109                                 vopt = 1;
 110                                 break;
 111                         case 'h':       /* --help */
 112                         default:
 113                                 usage();
 114                 }
 115         }
 116
 117         if (lshowmount(lopt, eopt, vopt) == 0) {
 118                 fprintf(stderr, "%s: lustre server modules not loaded\n", prog);
 119                 exit(1);
 120         }
 121         exit(0);
 122 }
 123
 124 static void print_nids(NIDList nidlist, int lookup, int enumerate, int indent)
 125 {
 126         char *s, *sep = "\n", *pfx = "";
 127
 128         if (lookup)
 129                 nl_lookup_ip(nidlist);
 130         nl_sort(nidlist);
 131         nl_uniq(nidlist);
 132         if (nl_count(nidlist) > 0) {
 133                 if (indent) {
 134                         sep = "\n    ";
 135                         pfx = "    ";
 136                 }
 137                 if (enumerate)
 138                         s = nl_string(nidlist, sep);
 139                 else
 140                         s = nl_xstring(nidlist, sep);
 141                 printf("%s%s\n", pfx, s);
 142                 free(s);
 143         }
 144 }
 145
 146 static int lshowmount(int lookup, int enumerate, int verbose)
 147 {
 148         char *dirs[] = PROC_DIRS;
 149         char exp[PATH_MAX + 1];
 150         NIDList nidlist = NULL;
 151         DIR *topdirp;
 152         struct dirent *dp;
 153         int i;
 154         int opens = 0;
 155
 156         if (!verbose)
 157                 nidlist = nl_create();
 158         for (i = 0; dirs[i] != NULL; i++) {
 159                 if ((topdirp = opendir(dirs[i])) == NULL)
 160                         continue;
 161                 while ((dp = readdir(topdirp))) {
 162                         if (dp->d_type != DT_DIR)
 163                                 continue;
 164                         if (!strcmp(dp->d_name, "."))
 165                                 continue;
 166                         if (!strcmp(dp->d_name, ".."))
 167                                 continue;
 168                         sprintf(exp, PROC_EXPORTS_TMPL, dirs[i], dp->d_name);
 169                         if (verbose) {
 170                                 nidlist = nl_create();
 171                                 read_exports(exp, nidlist);
 172                                 printf("%s:\n", dp->d_name);
 173                                 print_nids(nidlist, lookup, enumerate, 1);
 174                                 nl_destroy(nidlist);
 175                         } else
 176                                 read_exports(exp, nidlist);
 177                 }
 178                 closedir(topdirp);
 179                 opens++;
 180         }
 181         if (!verbose) {
 182                 print_nids(nidlist, lookup, enumerate, 0);
 183                 nl_destroy(nidlist);
 184         }
 185         return opens;
 186 }
 187
 188 static int empty_proc_file(char *path)
 189 {
 190         int empty = 0;
 191         char buf[36];
 192         int fd;
 193
 194         if ((fd = open(path, O_RDONLY)) < 0 || read(fd, buf, sizeof(buf)) <= 0)
 195                 empty = 1;
 196         if (fd >= 0)
 197                 close(fd);
 198         return empty;
 199 }
 200
 201 static void read_exports(char *exports, NIDList nidlist)
 202 {
 203         DIR *dirp;
 204         struct dirent *dp;
 205         char path[PATH_MAX + 1];
 206
 207         if ((dirp = opendir(exports))) {
 208                 while ((dp = readdir(dirp))) {
 209                         if (dp->d_type != DT_DIR)
 210                                 continue;
 211                         if (!strcmp(dp->d_name, "."))
 212                                 continue;
 213                         if (!strcmp(dp->d_name, ".."))
 214                                 continue;
 215                         if (strchr(dp->d_name, '@') == NULL)
 216                                 continue;
 217                         sprintf(path, PROC_UUID_TMPL, exports, dp->d_name);
 218                         if (empty_proc_file(path))
 219                                 continue;
 220
 221                         nl_add(nidlist, dp->d_name);
 222                 }
 223                 closedir(dirp);
 224         }
 225 }