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