lustre/utils/lshowmount.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*
  27  * This file is part of Lustre, http://www.lustre.org/
  28  *
  29  * lustre/utils/lshowmount.h
  30  *
  31  * Author: Herb Wartens <wartens2@llnl.gov>
  32  * Author: Jim Garlick <garlick@llnl.gov>
  33  */
  34
  35 #ifndef _GNU_SOURCE
  36 #define _GNU_SOURCE
  37 #endif
  38
  39 #include <stdlib.h>
  40 #include <stdio.h>
  41 #include <unistd.h>
  42 #include <getopt.h>
  43 #include <dirent.h>
  44 #include <string.h>
  45 #include <sys/stat.h>
  46 #include <fcntl.h>
  47 #include <arpa/inet.h>
  48 #include <netdb.h>
  49 #include <errno.h>
  50 #include <libgen.h>
  51
  52 #include <lustre/lustre_user.h>
  53 #include "nidlist.h"
  54 #include "lustreapi_internal.h"
  55
  56 #define PROC_UUID_TMPL          "%s/%s/uuid"
  57
  58 static void print_nids(NIDList nidlist, int lookup, int enumerate, int indent);
  59 static int lshowmount(int lookup, int enumerate, int verbose);
  60 static void read_exports(char *exports, NIDList nidlist);
  61
  62 char *prog;
  63
  64 #define OPTIONS "ehlv"
  65 static struct option long_options[] = {
  66         {"enumerate", no_argument, 0, 'e'},
  67         {"help",      no_argument, 0, 'h'},
  68         {"lookup",    no_argument, 0, 'l'},
  69         {"verbose",   no_argument, 0, 'v'},
  70         {0, 0, 0, 0},
  71 };
  72
  73 static void usage(void)
  74 {
  75         fprintf(stderr, "usage: %s [-e] [-h] [-l] [-v]\n", prog);
  76         exit(1);
  77 }
  78
  79 int main(int argc, char **argv)
  80 {
  81         int opt, optidx = 0;
  82         int lopt = 0;
  83         int vopt = 0;
  84         int eopt = 0;
  85
  86         prog = basename(argv[0]);
  87
  88         while ((opt = getopt_long(argc, argv, OPTIONS, long_options,
  89                                   &optidx)) != -1) {
  90                 switch (opt) {
  91                 case 'e':       /* --enumerate */
  92                         eopt = 1;
  93                         break;
  94                 case 'l':       /* --lookup */
  95                         lopt = 1;
  96                         break;
  97                 case 'v':       /* --verbose */
  98                         vopt = 1;
  99                         break;
 100                 case 'h':       /* --help */
 101                 default:
 102                         usage();
 103                 }
 104         }
 105
 106         if (lshowmount(lopt, eopt, vopt) == 0) {
 107                 fprintf(stderr, "%s: lustre server modules not loaded\n", prog);
 108                 exit(1);
 109         }
 110         exit(0);
 111 }
 112
 113
 114 static void print_expname(const char *path)
 115 {
 116         char *hp, buf[PATH_MAX + 1];
 117
 118         strncpy(buf, path, PATH_MAX);
 119         buf[PATH_MAX] = '\0';
 120         hp = strstr(buf, "exports");
 121         if (hp && hp > buf) {
 122                 *(--hp) = '\0';
 123                 for (; *hp == '/' && hp > buf; hp--)
 124                         ;
 125                 for (; *hp != '/' && hp > buf; hp--)
 126                         ;
 127                 printf("%s:\n", hp + 1);
 128         }
 129 }
 130
 131 static void print_nids(NIDList nidlist, int lookup, int enumerate, int indent)
 132 {
 133         char *s, *sep = "\n", *pfx = "";
 134
 135         if (lookup)
 136                 nl_lookup_ip(nidlist);
 137         nl_sort(nidlist);
 138         nl_uniq(nidlist);
 139         if (nl_count(nidlist) > 0) {
 140                 if (indent) {
 141                         sep = "\n    ";
 142                         pfx = "    ";
 143                 }
 144                 if (enumerate)
 145                         s = nl_string(nidlist, sep);
 146                 else
 147                         s = nl_xstring(nidlist, sep);
 148                 printf("%s%s\n", pfx, s);
 149                 free(s);
 150         }
 151 }
 152
 153 static int lshowmount(int lookup, int enumerate, int verbose)
 154 {
 155         NIDList nidlist = NULL;
 156         glob_t exp_list;
 157         int i;
 158
 159         i = get_lustre_param_path("{mgs,mdt,obdfilter}", "*",
 160                                    FILTER_BY_EXACT, "exports", &exp_list);
 161         if (i < 0)
 162                 return i;
 163         if (!verbose)
 164                 nidlist = nl_create();
 165         for (i = 0; i < exp_list.gl_pathc; i++) {
 166                 if (verbose) {
 167                         nidlist = nl_create();
 168                         read_exports(exp_list.gl_pathv[i], nidlist);
 169                         print_expname(exp_list.gl_pathv[i]);
 170                         print_nids(nidlist, lookup, enumerate, 1);
 171                         nl_destroy(nidlist);
 172                 } else
 173                         read_exports(exp_list.gl_pathv[i], nidlist);
 174         }
 175         if (!verbose) {
 176                 print_nids(nidlist, lookup, enumerate, 0);
 177                 nl_destroy(nidlist);
 178         }
 179         cfs_free_param_data(&exp_list);
 180         return i;
 181 }
 182
 183 static int empty_proc_file(char *path)
 184 {
 185         int empty = 0;
 186         char buf[36];
 187         int fd;
 188
 189         fd = open(path, O_RDONLY);
 190         if (fd < 0 || read(fd, buf, sizeof(buf)) <= 0)
 191                 empty = 1;
 192         if (fd >= 0)
 193                 close(fd);
 194         return empty;
 195 }
 196
 197 static void read_exports(char *exports, NIDList nidlist)
 198 {
 199         DIR *dirp;
 200         struct dirent *dp;
 201         char path[PATH_MAX + 1];
 202
 203         dirp = opendir(exports);
 204         if (dirp) {
 205                 while ((dp = readdir(dirp))) {
 206                         if (dp->d_type != DT_DIR)
 207                                 continue;
 208                         if (!strcmp(dp->d_name, "."))
 209                                 continue;
 210                         if (!strcmp(dp->d_name, ".."))
 211                                 continue;
 212                         if (strchr(dp->d_name, '@') == NULL)
 213                                 continue;
 214                         snprintf(path, sizeof(path), PROC_UUID_TMPL, exports,
 215                                  dp->d_name);
 216                         if (empty_proc_file(path))
 217                                 continue;
 218
 219                         nl_add(nidlist, dp->d_name);
 220                 }
 221                 closedir(dirp);
 222         }
 223 }