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:      Copyright (C) 2003 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
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <string.h>
  23
  24 #include <parser.h>
  25 #include <vector.h>
  26 #include <memory.h>
  27 #include <libdevmapper.h>
  28 #include <devmapper.h>
  29 #include <checkers.h>
  30 #include <path_state.h>
  31 #include <blacklist.h>
  32 #include <hwtable.h>
  33 #include <util.h>
  34 #include <defaults.h>
  35 #include <structs.h>
  36 #include <dmparser.h>
  37 #include <cache.h>
  38 #include <config.h>
  39 #include <propsel.h>
  40 #include <discovery.h>
  41 #include <debug.h>
  42 #include <switchgroup.h>
  43 #include <sysfs/libsysfs.h>
  44 #include <print.h>
  45
  46 #include "main.h"
  47 #include "pgpolicies.h"
  48 #include "dict.h"
  49
  50 /* for column aligned output */
  51 struct path_layout pl;
  52
  53 static char *
  54 get_refwwid (vector pathvec)
  55 {
  56         struct path * pp;
  57         char buff[FILE_NAME_SIZE];
  58         char * refwwid;
  59
  60         if (conf->dev_type == DEV_NONE)
  61                 return NULL;
  62
  63         if (conf->dev_type == DEV_DEVNODE) {
  64                 condlog(3, "limited scope = %s", conf->dev);
  65                 basename(conf->dev, buff);
  66                 pp = find_path_by_dev(pathvec, buff);
  67
  68                 if (!pp) {
  69                         pp = alloc_path();
  70
  71                         if (!pp)
  72                                 return NULL;
  73
  74                         strncpy(pp->dev, buff, FILE_NAME_SIZE);
  75
  76                         if (pathinfo(pp, conf->hwtable, DI_SYSFS | DI_WWID))
  77                                 return NULL;
  78
  79                         if (store_path(pathvec, pp)) {
  80                                 free_path(pp);
  81                                 return NULL;
  82                         }
  83                 }
  84
  85                 refwwid = MALLOC(WWID_SIZE);
  86
  87                 if (!refwwid)
  88                         return NULL;
  89
  90                 memcpy(refwwid, pp->wwid, WWID_SIZE);
  91                 return refwwid;
  92         }
  93
  94         if (conf->dev_type == DEV_DEVT) {
  95                 condlog(3, "limited scope = %s", conf->dev);
  96                 pp = find_path_by_devt(pathvec, conf->dev);
  97
  98                 if (!pp) {
  99                         if (devt2devname(conf->dev, buff))
 100                                 return NULL;
 101
 102                         pp = alloc_path();
 103
 104                         if (!pp)
 105                                 return NULL;
 106
 107                         if(safe_sprintf(pp->dev, "%s", buff)) {
 108                                 fprintf(stderr, "pp->dev too small\n");
 109                                 exit(1);
 110                         }
 111                         if (pathinfo(pp, conf->hwtable, DI_SYSFS | DI_WWID))
 112                                 return NULL;
 113
 114                         if (store_path(pathvec, pp)) {
 115                                 free_path(pp);
 116                                 return NULL;
 117                         }
 118                 }
 119
 120                 refwwid = MALLOC(WWID_SIZE);
 121
 122                 if (!refwwid)
 123                         return NULL;
 124
 125                 memcpy(refwwid, pp->wwid, WWID_SIZE);
 126                 return refwwid;
 127         }
 128         if (conf->dev_type == DEV_DEVMAP) {
 129                 condlog(3, "limited scope = %s", conf->dev);
 130                 /*
 131                  * may be an alias
 132                  */
 133                 refwwid = get_mpe_wwid(conf->dev);
 134
 135                 if (refwwid)
 136                         return refwwid;
 137
 138                 /*
 139                  * or directly a wwid
 140                  */
 141                 refwwid = MALLOC(WWID_SIZE);
 142
 143                 if (!refwwid)
 144                         return NULL;
 145
 146                 strncpy(refwwid, conf->dev, WWID_SIZE);
 147                 return refwwid;
 148         }
 149         return NULL;
 150 }
 151
 152 static void
 153 print_path (struct path * pp, char * style)
 154 {
 155         char buff[MAX_LINE_LEN];
 156
 157         snprint_path(&buff[0], MAX_LINE_LEN, style, pp, &pl);
 158         printf("%s", buff);
 159 }
 160
 161 static void
 162 print_map (struct multipath * mpp)
 163 {
 164         if (mpp->size && mpp->params)
 165                 printf("0 %llu %s %s\n",
 166                          mpp->size, DEFAULT_TARGET, mpp->params);
 167         return;
 168 }
 169
 170 static void
 171 print_all_paths (vector pathvec)
 172 {
 173         int i;
 174         struct path * pp;
 175
 176         vector_foreach_slot (pathvec, pp, i)
 177                 print_path(pp, PRINT_PATH_LONG);
 178 }
 179
 180 static void
 181 print_mp (struct multipath * mpp)
 182 {
 183         int j, i;
 184         struct path * pp = NULL;
 185         struct pathgroup * pgp = NULL;
 186
 187         if (mpp->action == ACT_NOTHING || conf->verbosity == 0)
 188                 return;
 189
 190         if (conf->verbosity > 1) {
 191                 switch (mpp->action) {
 192                 case ACT_RELOAD:
 193                         printf("%s: ", ACT_RELOAD_STR);
 194                         break;
 195
 196                 case ACT_CREATE:
 197                         printf("%s: ", ACT_CREATE_STR);
 198                         break;
 199
 200                 case ACT_SWITCHPG:
 201                         printf("%s: ", ACT_SWITCHPG_STR);
 202                         break;
 203
 204                 default:
 205                         break;
 206                 }
 207         }
 208
 209         if (mpp->alias)
 210                 printf("%s", mpp->alias);
 211
 212         if (conf->verbosity == 1) {
 213                 printf("\n");
 214                 return;
 215         }
 216         if (strncmp(mpp->alias, mpp->wwid, WWID_SIZE))
 217                 printf(" (%s)", mpp->wwid);
 218
 219         printf("\n");
 220
 221         if (mpp->size < (1 << 11))
 222                 printf("[size=%llu kB]", mpp->size >> 1);
 223         else if (mpp->size < (1 << 21))
 224                 printf("[size=%llu MB]", mpp->size >> 11);
 225         else if (mpp->size < (1 << 31))
 226                 printf("[size=%llu GB]", mpp->size >> 21);
 227         else
 228                 printf("[size=%llu TB]", mpp->size >> 31);
 229
 230         if (mpp->features)
 231                 printf("[features=\"%s\"]", mpp->features);
 232
 233         if (mpp->hwhandler)
 234                 printf("[hwhandler=\"%s\"]", mpp->hwhandler);
 235
 236         fprintf(stdout, "\n");
 237
 238         if (!mpp->pg)
 239                 return;
 240
 241         vector_foreach_slot (mpp->pg, pgp, j) {
 242                 printf("\\_ ");
 243
 244                 if (mpp->selector) {
 245                         printf("%s ", mpp->selector);
 246 #if 0
 247                         /* align to path status info */
 248                         for (i = pl.hbtl_len + pl.dev_len + pl.dev_t_len + 4;
 249                              i > strlen(mpp->selector); i--)
 250                                 printf(" ");
 251 #endif
 252                 }
 253                 if (pgp->priority)
 254                         printf("[prio=%i]", pgp->priority);
 255
 256                 switch (pgp->status) {
 257                 case PGSTATE_ENABLED:
 258                         printf("[enabled]");
 259                         break;
 260                 case PGSTATE_DISABLED:
 261                         printf("[disabled]");
 262                         break;
 263                 case PGSTATE_ACTIVE:
 264                         printf("[active]");
 265                         break;
 266                 default:
 267                         break;
 268                 }
 269                 printf("\n");
 270
 271                 vector_foreach_slot (pgp->paths, pp, i)
 272                         print_path(pp, PRINT_PATH_INDENT);
 273         }
 274         printf("\n");
 275 }
 276
 277 static int
 278 filter_pathvec (vector pathvec, char * refwwid)
 279 {
 280         int i;
 281         struct path * pp;
 282
 283         if (!refwwid || !strlen(refwwid))
 284                 return 0;
 285
 286         vector_foreach_slot (pathvec, pp, i) {
 287                 if (memcmp(pp->wwid, refwwid, WWID_SIZE) != 0) {
 288                         condlog(3, "skip path %s : out of scope", pp->dev);
 289                         free_path(pp);
 290                         vector_del_slot(pathvec, i);
 291                         i--;
 292                 }
 293         }
 294         return 0;
 295 }
 296
 297 /*
 298  * Transforms the path group vector into a proper device map string
 299  */
 300 int
 301 assemble_map (struct multipath * mp)
 302 {
 303         int i, j;
 304         int shift, freechar;
 305         int minio;
 306         char * p;
 307         struct pathgroup * pgp;
 308         struct path * pp;
 309
 310         p = mp->params;
 311         freechar = sizeof(mp->params);
 312
 313         shift = snprintf(p, freechar, "%s %s %i %i",
 314                          mp->features, mp->hwhandler,
 315                          VECTOR_SIZE(mp->pg), mp->nextpg);
 316
 317         if (shift >= freechar) {
 318                 fprintf(stderr, "mp->params too small\n");
 319                 return 1;
 320         }
 321         p += shift;
 322         freechar -= shift;
 323
 324         vector_foreach_slot (mp->pg, pgp, i) {
 325                 pgp = VECTOR_SLOT(mp->pg, i);
 326                 shift = snprintf(p, freechar, " %s %i 1", mp->selector,
 327                                  VECTOR_SIZE(pgp->paths));
 328                 if (shift >= freechar) {
 329                         fprintf(stderr, "mp->params too small\n");
 330                         return 1;
 331                 }
 332                 p += shift;
 333                 freechar -= shift;
 334
 335                 vector_foreach_slot (pgp->paths, pp, j) {
 336                         minio = conf->minio;
 337
 338                         if (mp->rr_weight == RR_WEIGHT_PRIO && pp->priority)
 339                                 minio *= pp->priority;
 340
 341                         shift = snprintf(p, freechar, " %s %d",
 342                                          pp->dev_t, minio);
 343                         if (shift >= freechar) {
 344                                 fprintf(stderr, "mp->params too small\n");
 345                                 return 1;
 346                         }
 347                         p += shift;
 348                         freechar -= shift;
 349                 }
 350         }
 351         if (freechar < 1) {
 352                 fprintf(stderr, "mp->params too small\n");
 353                 return 1;
 354         }
 355         snprintf(p, 1, "\n");
 356
 357         if (conf->verbosity > 2)
 358                 print_map(mp);
 359
 360         return 0;
 361 }
 362
 363 static int
 364 setup_map (struct multipath * mpp)
 365 {
 366         struct path * pp;
 367         int i;
 368
 369         /*
 370          * don't bother if devmap size is unknown
 371          */
 372         if (mpp->size <= 0) {
 373                 condlog(3, "%s devmap size is unknown", mpp->alias);
 374                 return 1;
 375         }
 376
 377         /*
 378          * don't bother if a constituant path is claimed
 379          * (not by the device mapper driver)
 380          */
 381         vector_foreach_slot (mpp->paths, pp, i) {
 382                 if (pp->claimed && pp->dmstate == PSTATE_UNDEF) {
 383                         condlog(3, "%s claimed", pp->dev);
 384                         return 1;
 385                 }
 386         }
 387
 388         /*
 389          * properties selectors
 390          */
 391         select_pgpolicy(mpp);
 392         select_selector(mpp);
 393         select_features(mpp);
 394         select_hwhandler(mpp);
 395         select_rr_weight(mpp);
 396
 397         /*
 398          * apply selected grouping policy to valid paths
 399          */
 400         switch (mpp->pgpolicy) {
 401         case MULTIBUS:
 402                 one_group(mpp);
 403                 break;
 404         case FAILOVER:
 405                 one_path_per_group(mpp);
 406                 break;
 407         case GROUP_BY_SERIAL:
 408                 group_by_serial(mpp);
 409                 break;
 410         case GROUP_BY_PRIO:
 411                 group_by_prio(mpp);
 412                 break;
 413         case GROUP_BY_NODE_NAME:
 414                 group_by_node_name(mpp);
 415                 break;
 416         default:
 417                 break;
 418         }
 419
 420         if (mpp->pg == NULL) {
 421                 condlog(3, "pgpolicy failed to produce a pg vector");
 422                 return 1;
 423         }
 424
 425         /*
 426          * ponders each path group and determine highest prio pg
 427          * to switch over (default to first)
 428          */
 429         select_path_group(mpp);
 430
 431         /*
 432          * transform the mp->pg vector of vectors of paths
 433          * into a mp->params strings to feed the device-mapper
 434          */
 435         if (assemble_map(mpp)) {
 436                 condlog(3, "problem assembing map");
 437                 return 1;
 438         }
 439         return 0;
 440 }
 441
 442 static int
 443 pathcount (struct multipath * mpp, int state)
 444 {
 445         struct pathgroup *pgp;
 446         struct path *pp;
 447         int i, j;
 448         int count = 0;
 449
 450         vector_foreach_slot (mpp->pg, pgp, i)
 451                 vector_foreach_slot (pgp->paths, pp, j)
 452                         if (pp->state == state)
 453                                 count++;
 454         return count;
 455 }
 456
 457 static void
 458 compute_pgid(struct pathgroup * pgp)
 459 {
 460         struct path * pp;
 461         int i;
 462
 463         vector_foreach_slot (pgp->paths, pp, i)
 464                 pgp->id ^= (long)pp;
 465 }
 466
 467 static int
 468 pgcmp (struct multipath * mpp, struct multipath * cmpp)
 469 {
 470         int i, j;
 471         struct pathgroup * pgp;
 472         struct pathgroup * cpgp;
 473         int r = 0;
 474
 475         vector_foreach_slot (mpp->pg, pgp, i) {
 476                 compute_pgid(pgp);
 477
 478                 vector_foreach_slot (cmpp->pg, cpgp, j) {
 479                         if (pgp->id == cpgp->id) {
 480                                 r = 0;
 481                                 break;
 482                         }
 483                         r++;
 484                 }
 485                 if (r)
 486                         return r;
 487         }
 488         return r;
 489 }
 490
 491 static void
 492 select_action (struct multipath * mpp, vector curmp)
 493 {
 494         struct multipath * cmpp;
 495
 496         cmpp = find_mp(curmp, mpp->alias);
 497
 498         if (!cmpp) {
 499                 cmpp = find_mp_by_wwid(curmp, mpp->wwid);
 500
 501                 if (cmpp && !conf->dry_run) {
 502                         condlog(2, "remove: %s (dup of %s)",
 503                                 cmpp->alias, mpp->alias);
 504                         dm_flush_map(cmpp->alias, DEFAULT_TARGET);
 505                 }
 506                 mpp->action = ACT_CREATE;
 507                 return;
 508         }
 509         if (pathcount(mpp, PATH_UP) == 0) {
 510                 condlog(3, "no good path");
 511                 mpp->action = ACT_NOTHING;
 512                 return;
 513         }
 514         if (cmpp->size != mpp->size) {
 515                 condlog(3, "size different than current");
 516                 mpp->action = ACT_RELOAD;
 517                 return;
 518         }
 519         if (strncmp(cmpp->features, mpp->features,
 520                     strlen(mpp->features))) {
 521                 condlog(3, "features different than current");
 522                 mpp->action =  ACT_RELOAD;
 523                 return;
 524         }
 525         if (strncmp(cmpp->hwhandler, mpp->hwhandler,
 526                     strlen(mpp->hwhandler))) {
 527                 condlog(3, "hwhandler different than current");
 528                 mpp->action = ACT_RELOAD;
 529                 return;
 530         }
 531         if (strncmp(cmpp->selector, mpp->selector,
 532                     strlen(mpp->selector))) {
 533                 condlog(3, "selector different than current");
 534                 mpp->action = ACT_RELOAD;
 535                 return;
 536         }
 537         if (VECTOR_SIZE(cmpp->pg) != VECTOR_SIZE(mpp->pg)) {
 538                 condlog(3, "different number of PG");
 539                 mpp->action = ACT_RELOAD;
 540                 return;
 541         }
 542         if (pgcmp(mpp, cmpp)) {
 543                 condlog(3, "different path group topology");
 544                 mpp->action = ACT_RELOAD;
 545                 return;
 546         }
 547         if (cmpp->nextpg != mpp->nextpg) {
 548                 condlog(3, "nextpg different than current");
 549                 mpp->action = ACT_SWITCHPG;
 550                 return;
 551         }
 552         mpp->action = ACT_NOTHING;
 553         return;
 554 }
 555
 556 static int
 557 reinstate_paths (struct multipath * mpp)
 558 {
 559         int i, j;
 560         struct pathgroup * pgp;
 561         struct path * pp;
 562
 563         vector_foreach_slot (mpp->pg, pgp, i) {
 564                 vector_foreach_slot (pgp->paths, pp, j) {
 565                         if (pp->state != PATH_UP &&
 566                             (pgp->status == PGSTATE_DISABLED ||
 567                              pgp->status == PGSTATE_ACTIVE))
 568                                 continue;
 569
 570                         if (pp->dmstate == PSTATE_FAILED) {
 571                                 if (dm_reinstate(mpp->alias, pp->dev_t))
 572                                         condlog(0, "error reinstating %s",
 573                                                 pp->dev);
 574                         }
 575                 }
 576         }
 577         return 0;
 578 }
 579
 580 static int
 581 domap (struct multipath * mpp)
 582 {
 583         int r = 0;
 584
 585         print_mp(mpp);
 586
 587         /*
 588          * last chance to quit before touching the devmaps
 589          */
 590         if (conf->dry_run)
 591                 return 0;
 592
 593         switch (mpp->action) {
 594         case ACT_NOTHING:
 595                 return 0;
 596
 597         case ACT_SWITCHPG:
 598                 dm_switchgroup(mpp->alias, mpp->nextpg);
 599                 /*
 600                  * we may have avoided reinstating paths because there where in
 601                  * active or disabled PG. Now that the topology has changed,
 602                  * retry.
 603                  */
 604                 reinstate_paths(mpp);
 605                 return 0;
 606
 607         case ACT_CREATE:
 608                 r = dm_addmap(DM_DEVICE_CREATE, mpp->alias, DEFAULT_TARGET,
 609                               mpp->params, mpp->size, mpp->wwid);
 610                 break;
 611
 612         case ACT_RELOAD:
 613                 r = dm_addmap(DM_DEVICE_RELOAD, mpp->alias, DEFAULT_TARGET,
 614                               mpp->params, mpp->size, NULL);
 615                 break;
 616
 617         default:
 618                 break;
 619         }
 620
 621         if (r) {
 622                 /*
 623                  * DM_DEVICE_CREATE or DM_DEVICE_RELOAD succeeded
 624                  */
 625                 dm_simplecmd(DM_DEVICE_RESUME, mpp->alias);
 626                 dm_switchgroup(mpp->alias, mpp->nextpg);
 627         }
 628
 629         return r;
 630 }
 631
 632 static int
 633 deadmap (struct multipath * mpp)
 634 {
 635         int i, j;
 636         struct pathgroup * pgp;
 637         struct path * pp;
 638
 639         vector_foreach_slot (mpp->pg, pgp, i)
 640                 vector_foreach_slot (pgp->paths, pp, j)
 641                         if (strlen(pp->dev))
 642                                 return 0; /* alive */
 643
 644         return 1; /* dead */
 645 }
 646
 647 static int
 648 coalesce_paths (vector curmp, vector pathvec)
 649 {
 650         int k, i;
 651         char empty_buff[WWID_SIZE];
 652         struct multipath * mpp;
 653         struct path * pp1;
 654         struct path * pp2;
 655
 656         memset(empty_buff, 0, WWID_SIZE);
 657
 658         vector_foreach_slot (pathvec, pp1, k) {
 659                 /* skip this path for some reason */
 660
 661                 /* 1. if path has no unique id or wwid blacklisted */
 662                 if (memcmp(empty_buff, pp1->wwid, WWID_SIZE) == 0 ||
 663                     blacklist(conf->blist, pp1->wwid))
 664                         continue;
 665
 666                 /* 2. if path already coalesced */
 667                 if (pp1->mpp)
 668                         continue;
 669
 670                 /*
 671                  * at this point, we know we really got a new mp
 672                  */
 673                 mpp = alloc_multipath();
 674
 675                 if (!mpp)
 676                         return 1;
 677
 678                 mpp->mpe = find_mpe(pp1->wwid);
 679                 mpp->hwe = pp1->hwe;
 680                 select_alias(mpp);
 681
 682                 pp1->mpp = mpp;
 683                 strcpy(mpp->wwid, pp1->wwid);
 684                 mpp->size = pp1->size;
 685                 mpp->paths = vector_alloc();
 686
 687                 if (pp1->priority < 0)
 688                         mpp->action = ACT_NOTHING;
 689
 690                 if (!mpp->paths)
 691                         return 1;
 692
 693                 if (store_path(mpp->paths, pp1))
 694                         return 1;
 695
 696                 for (i = k + 1; i < VECTOR_SIZE(pathvec); i++) {
 697                         pp2 = VECTOR_SLOT(pathvec, i);
 698
 699                         if (strcmp(pp1->wwid, pp2->wwid))
 700                                 continue;
 701
 702                         pp2->mpp = mpp;
 703
 704                         if (pp2->size != mpp->size) {
 705                                 /*
 706                                  * ouch, avoid feeding that to the DM
 707                                  */
 708                                 condlog(3, "path size mismatch : discard %s",
 709                                      mpp->wwid);
 710                                 mpp->action = ACT_NOTHING;
 711                         }
 712                         if (pp2->priority < 0)
 713                                 mpp->action = ACT_NOTHING;
 714
 715                         if (store_path(mpp->paths, pp2))
 716                                 return 1;
 717                 }
 718                 if (setup_map(mpp)) {
 719                         free_multipath(mpp, KEEP_PATHS);
 720                         continue;
 721                 }
 722                 condlog(3, "action preset to %i", mpp->action);
 723
 724                 if (mpp->action == ACT_UNDEF)
 725                         select_action(mpp, curmp);
 726
 727                 condlog(3, "action set to %i", mpp->action);
 728
 729                 domap(mpp);
 730                 drop_multipath(curmp, mpp->wwid, KEEP_PATHS);
 731                 free_multipath(mpp, KEEP_PATHS);
 732         }
 733         /*
 734          * Flush maps with only dead paths (ie not in sysfs)
 735          * Keep maps with only failed paths
 736          */
 737         vector_foreach_slot (curmp, mpp, i) {
 738                 if (!deadmap(mpp))
 739                         continue;
 740
 741                 if (dm_flush_map(mpp->alias, DEFAULT_TARGET))
 742                         condlog(2, "remove: %s (dead) failed!",
 743                                 mpp->alias);
 744                 else
 745                         condlog(2, "remove: %s (dead)", mpp->alias);
 746         }
 747         return 0;
 748 }
 749
 750 static void
 751 usage (char * progname)
 752 {
 753         fprintf (stderr, VERSION_STRING);
 754         fprintf (stderr, "Usage: %s\t[-v level] [-d] [-l|-ll|-f|-F]\n",
 755                 progname);
 756         fprintf (stderr,
 757                 "\t\t\t[-p failover|multibus|group_by_serial|group_by_prio]\n" \
 758                 "\t\t\t[device]\n" \
 759                 "\n" \
 760                 "\t-v level\tverbosty level\n" \
 761                 "\t   0\t\t\tno output\n" \
 762                 "\t   1\t\t\tprint created devmap names only\n" \
 763                 "\t   2\t\t\tdefault verbosity\n" \
 764                 "\t   3\t\t\tprint debug information\n" \
 765                 "\t-d\t\tdry run, do not create or update devmaps\n" \
 766                 "\t-l\t\tshow multipath topology (sysfs and DM info)\n" \
 767                 "\t-ll\t\tshow multipath topology (maximum info)\n" \
 768                 "\t-F\t\tflush a multipath device map\n" \
 769                 "\t-F\t\tflush all multipath device maps\n" \
 770                 "\t-p policy\tforce all maps to specified policy :\n" \
 771                 "\t   failover\t\t1 path per priority group\n" \
 772                 "\t   multibus\t\tall paths in 1 priority group\n" \
 773                 "\t   group_by_serial\t1 priority group per serial\n" \
 774                 "\t   group_by_prio\t1 priority group per priority lvl\n" \
 775                 "\t   group_by_node_name\t1 priority group per target node\n" \
 776                 "\n" \
 777                 "\tdevice\t\tlimit scope to the device's multipath\n" \
 778                 "\t\t\t(udev-style $DEVNAME reference, eg /dev/sdb\n" \
 779                 "\t\t\tor major:minor or a device map name)\n" \
 780                 );
 781
 782         exit(1);
 783 }
 784
 785 static int
 786 update_paths (struct multipath * mpp)
 787 {
 788         int i, j;
 789         struct pathgroup * pgp;
 790         struct path * pp;
 791
 792         vector_foreach_slot (mpp->pg, pgp, i) {
 793                 vector_foreach_slot (pgp->paths, pp, j) {
 794                         if (!strlen(pp->dev)) {
 795                                 if (devt2devname(pp->dev_t, pp->dev)) {
 796                                         /*
 797                                          * path is not in sysfs anymore
 798                                          */
 799                                         pp->state = PATH_DOWN;
 800                                         continue;
 801                                 }
 802                                 pathinfo(pp, conf->hwtable,
 803                                          DI_SYSFS | DI_CHECKER | \
 804                                          DI_SERIAL | DI_PRIO);
 805                                 continue;
 806                         }
 807                         if (pp->state == PATH_UNCHECKED)
 808                                 pathinfo(pp, conf->hwtable, DI_CHECKER);
 809
 810                         if (!pp->priority)
 811                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 812                 }
 813         }
 814         return 0;
 815 }
 816
 817 static int
 818 get_dm_mpvec (vector curmp, vector pathvec, char * refwwid)
 819 {
 820         int i;
 821         struct multipath * mpp;
 822
 823         if (dm_get_maps(curmp, DEFAULT_TARGET))
 824                 return 1;
 825
 826         vector_foreach_slot (curmp, mpp, i) {
 827                 /*
 828                  * discard out of scope maps
 829                  */
 830                 if (mpp->wwid && refwwid &&
 831                     strncmp(mpp->wwid, refwwid, WWID_SIZE))
 832                                 continue;
 833
 834                 condlog(3, "params = %s", mpp->params);
 835                 condlog(3, "status = %s", mpp->status);
 836
 837                 disassemble_map(pathvec, mpp->params, mpp);
 838
 839                 /*
 840                  * disassemble_map() can add new paths to pathvec.
 841                  * If not in "fast list mode", we need to fetch information
 842                  * about them
 843                  */
 844                 if (conf->list != 1)
 845                         update_paths(mpp);
 846
 847                 if (conf->list > 1)
 848                         select_path_group(mpp);
 849
 850                 disassemble_status(mpp->status, mpp);
 851
 852                 if (conf->list)
 853                         print_mp(mpp);
 854
 855                 if (!conf->dry_run)
 856                         reinstate_paths(mpp);
 857         }
 858         return 0;
 859 }
 860
 861 int
 862 main (int argc, char *argv[])
 863 {
 864         vector curmp = NULL;
 865         vector pathvec = NULL;
 866         int i;
 867         int di_flag = 0;
 868         int arg;
 869         extern char *optarg;
 870         extern int optind;
 871         char * refwwid = NULL;
 872
 873         if (getuid() != 0) {
 874                 fprintf(stderr, "need to be root\n");
 875                 exit(1);
 876         }
 877
 878         if (dm_prereq(DEFAULT_TARGET, 1, 0, 3))
 879                 exit(1);
 880
 881         if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
 882                 condlog(0, "multipath tools need sysfs mounted");
 883                 exit(1);
 884         }
 885         if (load_config(DEFAULT_CONFIGFILE))
 886                 exit(1);
 887
 888         while ((arg = getopt(argc, argv, ":qdl::Ffi:M:v:p:")) != EOF ) {
 889                 switch(arg) {
 890                 case 1: printf("optarg : %s\n",optarg);
 891                         break;
 892                 case 'v':
 893                         if (sizeof(optarg) > sizeof(char *) ||
 894                             !isdigit(optarg[0]))
 895                                 usage (argv[0]);
 896
 897                         conf->verbosity = atoi(optarg);
 898                         break;
 899                 case 'd':
 900                         conf->dry_run = 1;
 901                         break;
 902                 case 'f':
 903                         conf->remove = 1;
 904                         break;
 905                 case 'F':
 906                         conf->remove = 2;
 907                         break;
 908                 case 'l':
 909                         conf->list = 1;
 910                         conf->dry_run = 1;
 911
 912                         if (optarg && !strncmp(optarg, "l", 1))
 913                                 conf->list++;
 914
 915                         break;
 916                 case 'M':
 917 #if _DEBUG_
 918                         debug = atoi(optarg);
 919 #endif
 920                         break;
 921                 case 'p':
 922                         conf->pgpolicy_flag = get_pgpolicy_id(optarg);
 923                         if (conf->pgpolicy_flag == -1) {
 924                                 printf("'%s' is not a valid policy\n", optarg);
 925                                 usage(argv[0]);
 926                         }
 927                         break;
 928                 case ':':
 929                         fprintf(stderr, "Missing option arguement\n");
 930                         usage(argv[0]);
 931                 case '?':
 932                         fprintf(stderr, "Unknown switch: %s\n", optarg);
 933                         usage(argv[0]);
 934                 default:
 935                         usage(argv[0]);
 936                 }
 937         }
 938         if (optind < argc) {
 939                 conf->dev = MALLOC(FILE_NAME_SIZE);
 940
 941                 if (!conf->dev)
 942                         goto out;
 943
 944                 strncpy(conf->dev, argv[optind], FILE_NAME_SIZE);
 945
 946                 if (filepresent(conf->dev))
 947                         conf->dev_type = DEV_DEVNODE;
 948                 else if (sscanf(conf->dev, "%d:%d", &i, &i) == 2)
 949                         conf->dev_type = DEV_DEVT;
 950                 else
 951                         conf->dev_type = DEV_DEVMAP;
 952
 953         }
 954
 955         if (conf->remove == FLUSH_ONE) {
 956                 if (conf->dev_type == DEV_DEVMAP)
 957                         dm_flush_map(conf->dev, DEFAULT_TARGET);
 958                 else
 959                         condlog(0, "must provide a map name to remove");
 960
 961                 goto out;
 962         }
 963         else if (conf->remove == FLUSH_ALL) {
 964                 dm_flush_maps(DEFAULT_TARGET);
 965                 goto out;
 966         }
 967
 968         /*
 969          * allocate core vectors to store paths and multipaths
 970          */
 971         curmp = vector_alloc();
 972         pathvec = vector_alloc();
 973
 974         if (!curmp || !pathvec) {
 975                 condlog(0, "can not allocate memory");
 976                 goto out;
 977         }
 978
 979         /*
 980          * if we have a blacklisted device parameter, exit early
 981          */
 982         if (conf->dev && blacklist(conf->blist, conf->dev))
 983                 goto out;
 984
 985         condlog(3, "load path identifiers cache");
 986         cache_load(pathvec);
 987
 988         if (conf->verbosity > 2) {
 989                 fprintf(stdout, "#\n# all paths in cache :\n#\n");
 990                 print_all_paths(pathvec);
 991         }
 992
 993         /*
 994          * get a path list
 995          */
 996         if (conf->dev)
 997                 di_flag = DI_WWID;
 998
 999         if (conf->list > 1)
1000                 /* extended path info '-ll' */
1001                 di_flag |= DI_SYSFS | DI_CHECKER;
1002         else if (conf->list)
1003                 /* minimum path info '-l' */
1004                 di_flag |= DI_SYSFS;
1005         else
1006                 /* maximum info */
1007                 di_flag = DI_ALL;
1008
1009         if (path_discovery(pathvec, conf, di_flag))
1010                 goto out;
1011
1012         if (conf->verbosity > 2) {
1013                 fprintf(stdout, "#\n# all paths :\n#\n");
1014                 print_all_paths(pathvec);
1015         }
1016
1017         /*
1018          * scope limiting must be translated into a wwid
1019          * failing the translation is fatal (by policy)
1020          */
1021         if (conf->dev) {
1022                 refwwid = get_refwwid(pathvec);
1023
1024                 if (!refwwid) {
1025                         condlog(3, "scope is nul");
1026                         goto out;
1027                 }
1028         }
1029
1030         get_path_layout(&pl, pathvec);
1031
1032         if (get_dm_mpvec(curmp, pathvec, refwwid))
1033                 goto out;
1034
1035         filter_pathvec(pathvec, refwwid);
1036
1037         if (conf->list)
1038                 goto out;
1039
1040         /*
1041          * core logic entry point
1042          */
1043         coalesce_paths(curmp, pathvec);
1044
1045 out:
1046         if (refwwid)
1047                 FREE(refwwid);
1048
1049         free_multipathvec(curmp, KEEP_PATHS);
1050         free_pathvec(pathvec, FREE_PATHS);
1051         free_config(conf);
1052         dm_lib_release();
1053         dm_lib_exit();
1054 #ifdef _DEBUG_
1055         dbg_free_final(NULL);
1056 #endif
1057         exit(0);
1058 }