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
  29 #include <checkers.h>
  30 #include <prio.h>
  31 #include <vector.h>
  32 #include <memory.h>
  33 #include <libdevmapper.h>
  34 #include <devmapper.h>
  35 #include <util.h>
  36 #include <defaults.h>
  37 #include <structs.h>
  38 #include <structs_vec.h>
  39 #include <dmparser.h>
  40 #include <sysfs.h>
  41 #include <config.h>
  42 #include <blacklist.h>
  43 #include <discovery.h>
  44 #include <debug.h>
  45 #include <switchgroup.h>
  46 #include <print.h>
  47 #include <alias.h>
  48 #include <configure.h>
  49 #include <pgpolicies.h>
  50 #include <version.h>
  51 #include <errno.h>
  52 #include <sys/time.h>
  53 #include <sys/resource.h>
  54
  55 int logsink;
  56
  57 static int
  58 filter_pathvec (vector pathvec, char * refwwid)
  59 {
  60         int i;
  61         struct path * pp;
  62
  63         if (!refwwid || !strlen(refwwid))
  64                 return 0;
  65
  66         vector_foreach_slot (pathvec, pp, i) {
  67                 if (strncmp(pp->wwid, refwwid, WWID_SIZE) != 0) {
  68                         condlog(3, "skip path %s : out of scope", pp->dev);
  69                         free_path(pp);
  70                         vector_del_slot(pathvec, i);
  71                         i--;
  72                 }
  73         }
  74         return 0;
  75 }
  76
  77 static void
  78 usage (char * progname)
  79 {
  80         fprintf (stderr, VERSION_STRING);
  81         fprintf (stderr, "Usage:\n");
  82         fprintf (stderr, "  %s [-d] [-r] [-v lvl] [-p pol] [-b fil] [dev]\n", progname);
  83         fprintf (stderr, "  %s -l|-ll|-f [-v lvl] [-b fil] [dev]\n", progname);
  84         fprintf (stderr, "  %s -F [-v lvl]\n", progname);
  85         fprintf (stderr, "  %s -t\n", progname);
  86         fprintf (stderr, "  %s -h\n", progname);
  87         fprintf (stderr,
  88                 "\n"
  89                 "Where:\n"
  90                 "  -h      print this usage text\n" \
  91                 "  -l      show multipath topology (sysfs and DM info)\n" \
  92                 "  -ll     show multipath topology (maximum info)\n" \
  93                 "  -f      flush a multipath device map\n" \
  94                 "  -F      flush all multipath device maps\n" \
  95                 "  -d      dry run, do not create or update devmaps\n" \
  96                 "  -t      dump internal hardware table\n" \
  97                 "  -r      force devmap reload\n" \
  98                 "  -p      policy failover|multibus|group_by_serial|group_by_prio\n" \
  99                 "  -b fil  bindings file location\n" \
 100                 "  -p pol  force all maps to specified path grouping policy :\n" \
 101                 "          . failover            one path per priority group\n" \
 102                 "          . multibus            all paths in one priority group\n" \
 103                 "          . group_by_serial     one priority group per serial\n" \
 104                 "          . group_by_prio       one priority group per priority lvl\n" \
 105                 "          . group_by_node_name  one priority group per target node\n" \
 106                 "  -v lvl  verbosity level\n" \
 107                 "          . 0 no output\n" \
 108                 "          . 1 print created devmap names only\n" \
 109                 "          . 2 default verbosity\n" \
 110                 "          . 3 print debug information\n" \
 111                 "  dev     action limited to:\n" \
 112                 "          . multipath named 'dev' (ex: mpath0) or\n" \
 113                 "          . multipath whose wwid is 'dev' (ex: 60051..)\n" \
 114                 "          . multipath including the path named 'dev' (ex: /dev/sda)\n" \
 115                 "          . multipath including the path with maj:min 'dev' (ex: 8:0)\n" \
 116                 );
 117
 118         exit(1);
 119 }
 120
 121 static int
 122 update_paths (struct multipath * mpp)
 123 {
 124         int i, j;
 125         struct pathgroup * pgp;
 126         struct path * pp;
 127
 128         if (!mpp->pg)
 129                 return 0;
 130
 131         vector_foreach_slot (mpp->pg, pgp, i) {
 132                 if (!pgp->paths)
 133                         continue;
 134
 135                 vector_foreach_slot (pgp->paths, pp, j) {
 136                         if (!strlen(pp->dev)) {
 137                                 if (devt2devname(pp->dev, FILE_NAME_SIZE,
 138                                                  pp->dev_t)) {
 139                                         /*
 140                                          * path is not in sysfs anymore
 141                                          */
 142                                         pp->state = PATH_DOWN;
 143                                         continue;
 144                                 }
 145                                 pp->mpp = mpp;
 146                                 pathinfo(pp, conf->hwtable, DI_ALL);
 147                                 continue;
 148                         }
 149                         pp->mpp = mpp;
 150                         if (pp->state == PATH_UNCHECKED ||
 151                             pp->state == PATH_WILD)
 152                                 pathinfo(pp, conf->hwtable, DI_CHECKER);
 153
 154                         if (pp->priority == PRIO_UNDEF)
 155                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 156                 }
 157         }
 158         return 0;
 159 }
 160
 161 static int
 162 get_dm_mpvec (vector curmp, vector pathvec, char * refwwid)
 163 {
 164         int i;
 165         struct multipath * mpp;
 166         char params[PARAMS_SIZE], status[PARAMS_SIZE];
 167
 168         if (dm_get_maps(curmp))
 169                 return 1;
 170
 171         vector_foreach_slot (curmp, mpp, i) {
 172                 /*
 173                  * discard out of scope maps
 174                  */
 175                 if (mpp->wwid && refwwid &&
 176                     strncmp(mpp->wwid, refwwid, WWID_SIZE)) {
 177                         condlog(3, "skip map %s: out of scope", mpp->alias);
 178                         free_multipath(mpp, KEEP_PATHS);
 179                         vector_del_slot(curmp, i);
 180                         i--;
 181                         continue;
 182                 }
 183
 184                 dm_get_map(mpp->alias, &mpp->size, params);
 185                 condlog(3, "params = %s", params);
 186                 dm_get_status(mpp->alias, status);
 187                 condlog(3, "status = %s", status);
 188
 189                 disassemble_map(pathvec, params, mpp);
 190
 191                 /*
 192                  * disassemble_map() can add new paths to pathvec.
 193                  * If not in "fast list mode", we need to fetch information
 194                  * about them
 195                  */
 196                 if (conf->list != 1)
 197                         update_paths(mpp);
 198
 199                 if (conf->list > 1)
 200                         mpp->bestpg = select_path_group(mpp);
 201
 202                 disassemble_status(status, mpp);
 203
 204                 if (conf->list)
 205                         print_multipath_topology(mpp, conf->verbosity);
 206
 207                 if (!conf->dry_run)
 208                         reinstate_paths(mpp);
 209         }
 210         return 0;
 211 }
 212
 213
 214 /*
 215  * Return value:
 216  *  -1: Retry
 217  *   0: Success
 218  *   1: Failure
 219  */
 220 static int
 221 configure (void)
 222 {
 223         vector curmp = NULL;
 224         vector pathvec = NULL;
 225         struct vectors vecs;
 226         int r = 1;
 227         int di_flag = 0;
 228         char * refwwid = NULL;
 229         char * dev = NULL;
 230
 231         /*
 232          * allocate core vectors to store paths and multipaths
 233          */
 234         curmp = vector_alloc();
 235         pathvec = vector_alloc();
 236
 237         if (!curmp || !pathvec) {
 238                 condlog(0, "can not allocate memory");
 239                 goto out;
 240         }
 241         vecs.pathvec = pathvec;
 242         vecs.mpvec = curmp;
 243
 244         /*
 245          * dev is "/dev/" . "sysfs block dev"
 246          */
 247         if (conf->dev) {
 248                 if (!strncmp(conf->dev, "/dev/", 5) &&
 249                     strlen(conf->dev) > 5)
 250                         dev = conf->dev + 5;
 251                 else
 252                         dev = conf->dev;
 253         }
 254
 255         /*
 256          * if we have a blacklisted device parameter, exit early
 257          */
 258         if (dev &&
 259             (filter_devnode(conf->blist_devnode, conf->elist_devnode, dev) > 0))
 260                         goto out;
 261
 262         /*
 263          * scope limiting must be translated into a wwid
 264          * failing the translation is fatal (by policy)
 265          */
 266         if (conf->dev) {
 267                 refwwid = get_refwwid(conf->dev, conf->dev_type, pathvec);
 268
 269                 if (!refwwid) {
 270                         condlog(3, "scope is nul");
 271                         goto out;
 272                 }
 273                 condlog(3, "scope limited to %s", refwwid);
 274                 if (filter_wwid(conf->blist_wwid, conf->elist_wwid,
 275                                 refwwid) > 0)
 276                         goto out;
 277         }
 278
 279         /*
 280          * get a path list
 281          */
 282         if (conf->dev)
 283                 di_flag = DI_WWID;
 284
 285         if (conf->list > 1)
 286                 /* extended path info '-ll' */
 287                 di_flag |= DI_SYSFS | DI_CHECKER;
 288         else if (conf->list)
 289                 /* minimum path info '-l' */
 290                 di_flag |= DI_SYSFS;
 291         else
 292                 /* maximum info */
 293                 di_flag = DI_ALL;
 294
 295         if (path_discovery(pathvec, conf, di_flag))
 296                 goto out;
 297
 298         if (conf->verbosity > 2)
 299                 print_all_paths(pathvec, 1);
 300
 301         get_path_layout(pathvec, 0);
 302
 303         if (get_dm_mpvec(curmp, pathvec, refwwid))
 304                 goto out;
 305
 306         filter_pathvec(pathvec, refwwid);
 307
 308         if (conf->list) {
 309                 r = 0;
 310                 goto out;
 311         }
 312
 313         /*
 314          * core logic entry point
 315          */
 316         r = coalesce_paths(&vecs, NULL, NULL, conf->force_reload);
 317
 318 out:
 319         if (refwwid)
 320                 FREE(refwwid);
 321
 322         free_multipathvec(curmp, KEEP_PATHS);
 323         free_pathvec(pathvec, FREE_PATHS);
 324
 325         return r;
 326 }
 327
 328 static int
 329 dump_config (void)
 330 {
 331         char * c;
 332         char * reply;
 333         unsigned int maxlen = 256;
 334         int again = 1;
 335
 336         reply = MALLOC(maxlen);
 337
 338         while (again) {
 339                 if (!reply)
 340                         return 1;
 341                 c = reply;
 342                 c += snprint_defaults(c, reply + maxlen - c);
 343                 again = ((c - reply) == maxlen);
 344                 if (again) {
 345                         reply = REALLOC(reply, maxlen *= 2);
 346                         continue;
 347                 }
 348                 c += snprint_blacklist(c, reply + maxlen - c);
 349                 again = ((c - reply) == maxlen);
 350                 if (again) {
 351                         reply = REALLOC(reply, maxlen *= 2);
 352                         continue;
 353                 }
 354                 c += snprint_blacklist_except(c, reply + maxlen - c);
 355                 again = ((c - reply) == maxlen);
 356                 if (again) {
 357                         reply = REALLOC(reply, maxlen *= 2);
 358                         continue;
 359                 }
 360                 c += snprint_hwtable(c, reply + maxlen - c, conf->hwtable);
 361                 again = ((c - reply) == maxlen);
 362                 if (again) {
 363                         reply = REALLOC(reply, maxlen *= 2);
 364                         continue;
 365                 }
 366                 c += snprint_mptable(c, reply + maxlen - c, conf->mptable);
 367                 again = ((c - reply) == maxlen);
 368                 if (again)
 369                         reply = REALLOC(reply, maxlen *= 2);
 370         }
 371
 372         printf("%s", reply);
 373         FREE(reply);
 374         return 0;
 375 }
 376
 377 int
 378 main (int argc, char *argv[])
 379 {
 380         int arg;
 381         extern char *optarg;
 382         extern int optind;
 383         int i, r = 1;
 384
 385         if (getuid() != 0) {
 386                 fprintf(stderr, "need to be root\n");
 387                 exit(1);
 388         }
 389
 390         if (dm_prereq())
 391                 exit(1);
 392
 393         if (load_config(DEFAULT_CONFIGFILE))
 394                 exit(1);
 395
 396         if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
 397                 condlog(0, "multipath tools need sysfs mounted");
 398                 exit(1);
 399         }
 400         while ((arg = getopt(argc, argv, ":dhl::FfM:v:p:b:Brt")) != EOF ) {
 401                 switch(arg) {
 402                 case 1: printf("optarg : %s\n",optarg);
 403                         break;
 404                 case 'v':
 405                         if (sizeof(optarg) > sizeof(char *) ||
 406                             !isdigit(optarg[0]))
 407                                 usage (argv[0]);
 408
 409                         conf->verbosity = atoi(optarg);
 410                         break;
 411                 case 'b':
 412                         conf->bindings_file = strdup(optarg);
 413                         break;
 414                 case 'B':
 415                         conf->bindings_read_only = 1;
 416                         break;
 417                 case 'd':
 418                         conf->dry_run = 1;
 419                         break;
 420                 case 'f':
 421                         conf->remove = FLUSH_ONE;
 422                         break;
 423                 case 'F':
 424                         conf->remove = FLUSH_ALL;
 425                         break;
 426                 case 'l':
 427                         conf->list = 1;
 428                         conf->dry_run = 1;
 429
 430                         if (optarg && !strncmp(optarg, "l", 1))
 431                                 conf->list++;
 432
 433                         break;
 434                 case 'M':
 435 #if _DEBUG_
 436                         debug = atoi(optarg);
 437 #endif
 438                         break;
 439                 case 'p':
 440                         conf->pgpolicy_flag = get_pgpolicy_id(optarg);
 441                         if (conf->pgpolicy_flag == -1) {
 442                                 printf("'%s' is not a valid policy\n", optarg);
 443                                 usage(argv[0]);
 444                         }
 445                         break;
 446                 case 'r':
 447                         conf->force_reload = 1;
 448                         break;
 449                 case 't':
 450                         dump_config();
 451                         goto out;
 452                 case 'h':
 453                         usage(argv[0]);
 454                 case ':':
 455                         fprintf(stderr, "Missing option arguement\n");
 456                         usage(argv[0]);
 457                 case '?':
 458                         fprintf(stderr, "Unknown switch: %s\n", optarg);
 459                         usage(argv[0]);
 460                 default:
 461                         usage(argv[0]);
 462                 }
 463         }
 464         if (optind < argc) {
 465                 conf->dev = MALLOC(FILE_NAME_SIZE);
 466
 467                 if (!conf->dev)
 468                         goto out;
 469
 470                 strncpy(conf->dev, argv[optind], FILE_NAME_SIZE);
 471
 472                 if (filepresent(conf->dev))
 473                         conf->dev_type = DEV_DEVNODE;
 474                 else if (sscanf(conf->dev, "%d:%d", &i, &i) == 2)
 475                         conf->dev_type = DEV_DEVT;
 476                 else
 477                         conf->dev_type = DEV_DEVMAP;
 478
 479         }
 480         conf->daemon = 0;
 481
 482         if (conf->max_fds) {
 483                 struct rlimit fd_limit;
 484
 485                 fd_limit.rlim_cur = conf->max_fds;
 486                 fd_limit.rlim_max = conf->max_fds;
 487                 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
 488                         condlog(0, "can't set open fds limit to %d : %s\n",
 489                                 conf->max_fds, strerror(errno));
 490         }
 491
 492         if (init_checkers()) {
 493                 condlog(0, "failed to initialize checkers");
 494                 exit(1);
 495         }
 496         if (init_prio()) {
 497                 condlog(0, "failed to initialize prioritizers");
 498                 exit(1);
 499         }
 500         dm_init();
 501
 502         if (conf->remove == FLUSH_ONE) {
 503                 if (conf->dev_type == DEV_DEVMAP)
 504                         r = dm_flush_map(conf->dev);
 505                 else
 506                         condlog(0, "must provide a map name to remove");
 507
 508                 goto out;
 509         }
 510         else if (conf->remove == FLUSH_ALL) {
 511                 r = dm_flush_maps();
 512                 goto out;
 513         }
 514         while ((r = configure()) < 0)
 515                 condlog(3, "restart multipath configuration process");
 516
 517 out:
 518         udev_wait(conf->cookie);
 519
 520         sysfs_cleanup();
 521         dm_lib_release();
 522         dm_lib_exit();
 523
 524         cleanup_prio();
 525         cleanup_checkers();
 526         /*
 527          * Freeing config must be done after dm_lib_exit(), because
 528          * the logging function (dm_write_log()), which is called there,
 529          * references the config.
 530          */
 531         free_config(conf);
 532         conf = NULL;
 533
 534 #ifdef _DEBUG_
 535         dbg_free_final(NULL);
 536 #endif
 537         return r;
 538 }