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 <linux/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_opts[] = {
  66         { .val = 'e',   .name = "enumerate",    .has_arg = no_argument },
  67         { .val = 'h',   .name = "help",         .has_arg = no_argument },
  68         { .val = 'l',   .name = "lookup",       .has_arg = no_argument },
  69         { .val = 'v',   .name = "verbose",      .has_arg = no_argument },
  70         { .name = NULL } };
  71
  72 static void usage(void)
  73 {
  74         fprintf(stderr, "usage: %s [-e] [-h] [-l] [-v]\n", prog);
  75         exit(1);
  76 }
  77
  78 int main(int argc, char **argv)
  79 {
  80         int opt, optidx = 0;
  81         int lopt = 0;
  82         int vopt = 0;
  83         int eopt = 0;
  84
  85         prog = basename(argv[0]);
  86
  87         while ((opt = getopt_long(argc, argv, OPTIONS, long_opts,
  88                                   &optidx)) != -1) {
  89                 switch (opt) {
  90                 case 'e':       /* --enumerate */
  91                         eopt = 1;
  92                         break;
  93                 case 'l':       /* --lookup */
  94                         lopt = 1;
  95                         break;
  96                 case 'v':       /* --verbose */
  97                         vopt = 1;
  98                         break;
  99                 case 'h':       /* --help */
 100                 default:
 101                         usage();
 102                 }
 103         }
 104
 105         if (lshowmount(lopt, eopt, vopt) == 0) {
 106                 fprintf(stderr, "%s: lustre server modules not loaded\n", prog);
 107                 exit(1);
 108         }
 109         exit(0);
 110 }
 111
 112
 113 static void print_expname(const char *path)
 114 {
 115         char *hp, buf[PATH_MAX + 1];
 116
 117         strncpy(buf, path, PATH_MAX);
 118         buf[PATH_MAX] = '\0';
 119         hp = strstr(buf, "exports");
 120         if (hp && hp > buf) {
 121                 *(--hp) = '\0';
 122                 for (; *hp == '/' && hp > buf; hp--)
 123                         ;
 124                 for (; *hp != '/' && hp > buf; hp--)
 125                         ;
 126                 printf("%s:\n", hp + 1);
 127         }
 128 }
 129
 130 static void print_nids(NIDList nidlist, int lookup, int enumerate, int indent)
 131 {
 132         char *s, *sep = "\n", *pfx = "";
 133
 134         if (lookup)
 135                 nl_lookup_ip(nidlist);
 136         nl_sort(nidlist);
 137         nl_uniq(nidlist);
 138         if (nl_count(nidlist) > 0) {
 139                 if (indent) {
 140                         sep = "\n    ";
 141                         pfx = "    ";
 142                 }
 143                 if (enumerate)
 144                         s = nl_string(nidlist, sep);
 145                 else
 146                         s = nl_xstring(nidlist, sep);
 147                 printf("%s%s\n", pfx, s);
 148                 free(s);
 149         }
 150 }
 151
 152 static int lshowmount(int lookup, int enumerate, int verbose)
 153 {
 154         NIDList nidlist = NULL;
 155         glob_t exp_list;
 156         int i;
 157
 158         i = get_lustre_param_path("{mgs,mdt,obdfilter}", "*",
 159                                    FILTER_BY_EXACT, "exports", &exp_list);
 160         if (i < 0)
 161                 return i;
 162         if (!verbose)
 163                 nidlist = nl_create();
 164         for (i = 0; i < exp_list.gl_pathc; i++) {
 165                 if (verbose) {
 166                         nidlist = nl_create();
 167                         read_exports(exp_list.gl_pathv[i], nidlist);
 168                         print_expname(exp_list.gl_pathv[i]);
 169                         print_nids(nidlist, lookup, enumerate, 1);
 170                         nl_destroy(nidlist);
 171                 } else
 172                         read_exports(exp_list.gl_pathv[i], nidlist);
 173         }
 174         if (!verbose) {
 175                 print_nids(nidlist, lookup, enumerate, 0);
 176                 nl_destroy(nidlist);
 177         }
 178         cfs_free_param_data(&exp_list);
 179         return i;
 180 }
 181
 182 static int empty_proc_file(char *path)
 183 {
 184         int empty = 0;
 185         char buf[36];
 186         int fd;
 187
 188         fd = open(path, O_RDONLY);
 189         if (fd < 0 || read(fd, buf, sizeof(buf)) <= 0)
 190                 empty = 1;
 191         if (fd >= 0)
 192                 close(fd);
 193         return empty;
 194 }
 195
 196 static void read_exports(char *exports, NIDList nidlist)
 197 {
 198         DIR *dirp;
 199         struct dirent *dp;
 200         char path[PATH_MAX + 1];
 201
 202         dirp = opendir(exports);
 203         if (dirp) {
 204                 while ((dp = readdir(dirp))) {
 205                         if (dp->d_type != DT_DIR)
 206                                 continue;
 207                         if (!strcmp(dp->d_name, "."))
 208                                 continue;
 209                         if (!strcmp(dp->d_name, ".."))
 210                                 continue;
 211                         if (strchr(dp->d_name, '@') == NULL)
 212                                 continue;
 213                         snprintf(path, sizeof(path), PROC_UUID_TMPL, exports,
 214                                  dp->d_name);
 215                         if (empty_proc_file(path))
 216                                 continue;
 217
 218                         nl_add(nidlist, dp->d_name);
 219                 }
 220                 closedir(dirp);
 221         }
 222 }