multipath/main.c

   1 /*
   2  * Soft:        multipath device mapper target autoconfig
   3  *
   4  * Version:     $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
   5  *
   6  * Author:      Christophe Varoqui
   7  *
   8  *              This program is distributed in the hope that it will be useful,
   9  *              but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *              MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *              See the GNU General Public License for more details.
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  *
  18  * Copyright (c) 2003, 2004, 2005 Christophe Varoqui
  19  * Copyright (c) 2005 Benjamin Marzinski, Redhat
  20  * Copyright (c) 2005 Kiyoshi Ueda, NEC
  21  * Copyright (c) 2005 Patrick Caulfield, Redhat
  22  * Copyright (c) 2005 Edward Goggin, EMC
  23  */
  24
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <ctype.h>
  28 #include <sysfs/libsysfs.h>
  29
  30 #include <vector.h>
  31 #include <memory.h>
  32 #include <libdevmapper.h>
  33 #include <devmapper.h>
  34 #include <path_state.h>
  35 #include <blacklist.h>
  36 #include <util.h>
  37 #include <defaults.h>
  38 #include <structs.h>
  39 #include <structs_vec.h>
  40 #include <dmparser.h>
  41 #include <config.h>
  42 #include <discovery.h>
  43 #include <debug.h>
  44 #include <switchgroup.h>
  45 #include <print.h>
  46 #include <alias.h>
  47 #include <configure.h>
  48 #include <pgpolicies.h>
  49
  50 #include "main.h"
  51
  52 static int
  53 filter_pathvec (vector pathvec, char * refwwid)
  54 {
  55         int i;
  56         struct path * pp;
  57
  58         if (!refwwid || !strlen(refwwid))
  59                 return 0;
  60
  61         vector_foreach_slot (pathvec, pp, i) {
  62                 if (strncmp(pp->wwid, refwwid, WWID_SIZE) != 0) {
  63                         condlog(3, "skip path %s : out of scope", pp->dev);
  64                         free_path(pp);
  65                         vector_del_slot(pathvec, i);
  66                         i--;
  67                 }
  68         }
  69         return 0;
  70 }
  71
  72 static void
  73 usage (char * progname)
  74 {
  75         fprintf (stderr, VERSION_STRING);
  76         fprintf (stderr, "Usage: %s\t[-v level] [-d] [-l|-ll|-f|-F]\n",
  77                 progname);
  78         fprintf (stderr,
  79                 "\t\t\t[-p failover|multibus|group_by_serial|group_by_prio]\n" \
  80                 "\t\t\t[device]\n" \
  81                 "\n" \
  82                 "\t-v level\tverbosity level\n" \
  83                 "\t   0\t\t\tno output\n" \
  84                 "\t   1\t\t\tprint created devmap names only\n" \
  85                 "\t   2\t\t\tdefault verbosity\n" \
  86                 "\t   3\t\t\tprint debug information\n" \
  87                 "\t-b file\t\tbindings file location\n" \
  88                 "\t-d\t\tdry run, do not create or update devmaps\n" \
  89                 "\t-l\t\tshow multipath topology (sysfs and DM info)\n" \
  90                 "\t-ll\t\tshow multipath topology (maximum info)\n" \
  91                 "\t-f\t\tflush a multipath device map\n" \
  92                 "\t-F\t\tflush all multipath device maps\n" \
  93                 "\t-p policy\tforce all maps to specified policy :\n" \
  94                 "\t   failover\t\t1 path per priority group\n" \
  95                 "\t   multibus\t\tall paths in 1 priority group\n" \
  96                 "\t   group_by_serial\t1 priority group per serial\n" \
  97                 "\t   group_by_prio\t1 priority group per priority lvl\n" \
  98                 "\t   group_by_node_name\t1 priority group per target node\n" \
  99                 "\n" \
 100                 "\tdevice\t\tlimit scope to the device's multipath\n" \
 101                 "\t\t\t(udev-style $DEVNAME reference, eg /dev/sdb\n" \
 102                 "\t\t\tor major:minor or a device map name)\n" \
 103                 );
 104
 105         exit(1);
 106 }
 107
 108 static int
 109 update_paths (struct multipath * mpp)
 110 {
 111         int i, j;
 112         struct pathgroup * pgp;
 113         struct path * pp;
 114
 115         if (!mpp->pg)
 116                 return 0;
 117
 118         vector_foreach_slot (mpp->pg, pgp, i) {
 119                 if (!pgp->paths)
 120                         continue;
 121
 122                 vector_foreach_slot (pgp->paths, pp, j) {
 123                         if (!strlen(pp->dev)) {
 124                                 if (devt2devname(pp->dev, pp->dev_t)) {
 125                                         /*
 126                                          * path is not in sysfs anymore
 127                                          */
 128                                         pp->state = PATH_DOWN;
 129                                         continue;
 130                                 }
 131                                 pathinfo(pp, conf->hwtable, DI_ALL);
 132                                 continue;
 133                         }
 134                         if (pp->state == PATH_UNCHECKED)
 135                                 pathinfo(pp, conf->hwtable, DI_CHECKER);
 136
 137                         if (!pp->priority)
 138                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 139                 }
 140         }
 141         return 0;
 142 }
 143
 144 static int
 145 get_dm_mpvec (vector curmp, vector pathvec, char * refwwid)
 146 {
 147         int i;
 148         struct multipath * mpp;
 149
 150         if (dm_get_maps(curmp, DEFAULT_TARGET))
 151                 return 1;
 152
 153         vector_foreach_slot (curmp, mpp, i) {
 154                 /*
 155                  * discard out of scope maps
 156                  */
 157                 if (mpp->wwid && refwwid &&
 158                     strncmp(mpp->wwid, refwwid, WWID_SIZE)) {
 159                         condlog(3, "skip map %s: out of scope", mpp->alias);
 160                         free_multipath(mpp, KEEP_PATHS);
 161                         vector_del_slot(curmp, i);
 162                         i--;
 163                         continue;
 164                 }
 165
 166                 condlog(3, "params = %s", mpp->params);
 167                 condlog(3, "status = %s", mpp->status);
 168
 169                 disassemble_map(pathvec, mpp->params, mpp);
 170
 171                 /*
 172                  * disassemble_map() can add new paths to pathvec.
 173                  * If not in "fast list mode", we need to fetch information
 174                  * about them
 175                  */
 176                 if (conf->list != 1)
 177                         update_paths(mpp);
 178
 179                 if (conf->list > 1)
 180                         mpp->bestpg = select_path_group(mpp);
 181
 182                 disassemble_status(mpp->status, mpp);
 183
 184                 if (conf->list)
 185                         print_mp(mpp, conf->verbosity);
 186
 187                 if (!conf->dry_run)
 188                         reinstate_paths(mpp);
 189         }
 190         return 0;
 191 }
 192
 193
 194 /*
 195  * Return value:
 196  *  -1: Retry
 197  *   0: Success
 198  *   1: Failure
 199  */
 200 static int
 201 configure (void)
 202 {
 203         vector curmp = NULL;
 204         vector pathvec = NULL;
 205         struct vectors vecs;
 206         int r = 1;
 207         int di_flag = 0;
 208         char * refwwid = NULL;
 209         char * dev = NULL;
 210
 211         /*
 212          * allocate core vectors to store paths and multipaths
 213          */
 214         curmp = vector_alloc();
 215         pathvec = vector_alloc();
 216
 217         if (!curmp || !pathvec) {
 218                 condlog(0, "can not allocate memory");
 219                 goto out;
 220         }
 221         vecs.pathvec = pathvec;
 222         vecs.mpvec = curmp;
 223
 224         /*
 225          * if we have a blacklisted device parameter, exit early
 226          */
 227         if (conf->dev) {
 228                 if (!strncmp(conf->dev, "/dev/", 5) &&
 229                     strlen(conf->dev) > 5)
 230                         dev = conf->dev + 5;
 231                 else
 232                         dev = conf->dev;
 233         }
 234
 235         if (dev && blacklist(conf->blist, dev))
 236                 goto out;
 237
 238         /*
 239          * scope limiting must be translated into a wwid
 240          * failing the translation is fatal (by policy)
 241          */
 242         if (conf->dev) {
 243                 refwwid = get_refwwid(conf->dev, conf->dev_type, pathvec);
 244
 245                 if (!refwwid) {
 246                         condlog(3, "scope is nul");
 247                         goto out;
 248                 }
 249                 condlog(3, "scope limited to %s", refwwid);
 250         }
 251
 252         /*
 253          * get a path list
 254          */
 255         if (conf->dev)
 256                 di_flag = DI_WWID;
 257
 258         if (conf->list > 1)
 259                 /* extended path info '-ll' */
 260                 di_flag |= DI_SYSFS | DI_CHECKER;
 261         else if (conf->list)
 262                 /* minimum path info '-l' */
 263                 di_flag |= DI_SYSFS;
 264         else
 265                 /* maximum info */
 266                 di_flag = DI_ALL;
 267
 268         if (path_discovery(pathvec, conf, di_flag))
 269                 goto out;
 270
 271         if (conf->verbosity > 2)
 272                 print_all_paths(pathvec, 1);
 273
 274         get_path_layout(pathvec);
 275
 276         if (get_dm_mpvec(curmp, pathvec, refwwid))
 277                 goto out;
 278
 279         filter_pathvec(pathvec, refwwid);
 280
 281         if (conf->list)
 282                 goto out;
 283
 284         /*
 285          * core logic entry point
 286          */
 287         r = coalesce_paths(&vecs, NULL, NULL);
 288
 289 out:
 290         if (refwwid)
 291                 FREE(refwwid);
 292
 293         free_multipathvec(curmp, KEEP_PATHS);
 294         free_pathvec(pathvec, FREE_PATHS);
 295
 296         return r;
 297 }
 298
 299 int
 300 main (int argc, char *argv[])
 301 {
 302         int arg;
 303         extern char *optarg;
 304         extern int optind;
 305         int i, r;
 306
 307         if (getuid() != 0) {
 308                 fprintf(stderr, "need to be root\n");
 309                 exit(1);
 310         }
 311
 312         if (dm_prereq(DEFAULT_TARGET, 1, 0, 3))
 313                 exit(1);
 314
 315         if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
 316                 condlog(0, "multipath tools need sysfs mounted");
 317                 exit(1);
 318         }
 319         if (load_config(DEFAULT_CONFIGFILE))
 320                 exit(1);
 321
 322         while ((arg = getopt(argc, argv, ":qdl::Ffi:M:v:p:b:")) != EOF ) {
 323                 switch(arg) {
 324                 case 1: printf("optarg : %s\n",optarg);
 325                         break;
 326                 case 'v':
 327                         if (sizeof(optarg) > sizeof(char *) ||
 328                             !isdigit(optarg[0]))
 329                                 usage (argv[0]);
 330
 331                         conf->verbosity = atoi(optarg);
 332                         break;
 333                 case 'b':
 334                         conf->bindings_file = optarg;
 335                         break;
 336                 case 'd':
 337                         conf->dry_run = 1;
 338                         break;
 339                 case 'f':
 340                         conf->remove = FLUSH_ONE;
 341                         break;
 342                 case 'F':
 343                         conf->remove = FLUSH_ALL;
 344                         break;
 345                 case 'l':
 346                         conf->list = 1;
 347                         conf->dry_run = 1;
 348
 349                         if (optarg && !strncmp(optarg, "l", 1))
 350                                 conf->list++;
 351
 352                         break;
 353                 case 'M':
 354 #if _DEBUG_
 355                         debug = atoi(optarg);
 356 #endif
 357                         break;
 358                 case 'p':
 359                         conf->pgpolicy_flag = get_pgpolicy_id(optarg);
 360                         if (conf->pgpolicy_flag == -1) {
 361                                 printf("'%s' is not a valid policy\n", optarg);
 362                                 usage(argv[0]);
 363                         }
 364                         break;
 365                 case ':':
 366                         fprintf(stderr, "Missing option arguement\n");
 367                         usage(argv[0]);
 368                 case '?':
 369                         fprintf(stderr, "Unknown switch: %s\n", optarg);
 370                         usage(argv[0]);
 371                 default:
 372                         usage(argv[0]);
 373                 }
 374         }
 375         if (optind < argc) {
 376                 conf->dev = MALLOC(FILE_NAME_SIZE);
 377
 378                 if (!conf->dev)
 379                         goto out;
 380
 381                 strncpy(conf->dev, argv[optind], FILE_NAME_SIZE);
 382
 383                 if (filepresent(conf->dev))
 384                         conf->dev_type = DEV_DEVNODE;
 385                 else if (sscanf(conf->dev, "%d:%d", &i, &i) == 2)
 386                         conf->dev_type = DEV_DEVT;
 387                 else
 388                         conf->dev_type = DEV_DEVMAP;
 389
 390         }
 391
 392         if (conf->remove == FLUSH_ONE) {
 393                 if (conf->dev_type == DEV_DEVMAP)
 394                         dm_flush_map(conf->dev, DEFAULT_TARGET);
 395                 else
 396                         condlog(0, "must provide a map name to remove");
 397
 398                 goto out;
 399         }
 400         else if (conf->remove == FLUSH_ALL) {
 401                 dm_flush_maps(DEFAULT_TARGET);
 402                 goto out;
 403         }
 404         while ((r = configure()) < 0)
 405                 condlog(3, "restart multipath configuration process");
 406
 407 out:
 408         free_config(conf);
 409         dm_lib_release();
 410         dm_lib_exit();
 411 #ifdef _DEBUG_
 412         dbg_free_final(NULL);
 413 #endif
 414         return r;
 415 }