multipathd/main.c

   1 /*
   2  * Copyright (c) 2004, 2005 Christophe Varoqui
   3  * Copyright (c) 2005 Kiyoshi Ueda, NEC
   4  * Copyright (c) 2005 Benjamin Marzinski, Redhat
   5  * Copyright (c) 2005 Edward Goggin, EMC
   6  */
   7 #include <unistd.h>
   8 #include <sys/stat.h>
   9 #include <libdevmapper.h>
  10 #include <wait.h>
  11 #include <sys/mman.h>
  12 #include <sys/types.h>
  13 #include <fcntl.h>
  14 #include <errno.h>
  15
  16 /*
  17  * libsysfs
  18  */
  19 #include <sysfs/libsysfs.h>
  20 #include <sysfs/dlist.h>
  21
  22 /*
  23  * libcheckers
  24  */
  25 #include <checkers.h>
  26
  27 /*
  28  * libmultipath
  29  */
  30 #include <parser.h>
  31 #include <vector.h>
  32 #include <memory.h>
  33 #include <config.h>
  34 #include <util.h>
  35 #include <hwtable.h>
  36 #include <defaults.h>
  37 #include <structs.h>
  38 #include <callout.h>
  39 #include <blacklist.h>
  40 #include <structs_vec.h>
  41 #include <dmparser.h>
  42 #include <devmapper.h>
  43 #include <dict.h>
  44 #include <discovery.h>
  45 #include <debug.h>
  46 #include <propsel.h>
  47 #include <uevent.h>
  48 #include <switchgroup.h>
  49 #include <print.h>
  50 #include <configure.h>
  51
  52 #include "main.h"
  53 #include "pidfile.h"
  54 #include "uxlsnr.h"
  55 #include "uxclnt.h"
  56 #include "cli.h"
  57 #include "cli_handlers.h"
  58
  59 #define FILE_NAME_SIZE 256
  60 #define CMDSIZE 160
  61
  62 #define LOG_MSG(a,b) \
  63         if (strlen(b)) condlog(a, "%s: %s", pp->dev_t, b);
  64
  65 #ifdef LCKDBG
  66 #define lock(a) \
  67         fprintf(stderr, "%s:%s(%i) lock %p\n", __FILE__, __FUNCTION__, __LINE__, a); \
  68         pthread_mutex_lock(a)
  69 #define unlock(a) \
  70         fprintf(stderr, "%s:%s(%i) unlock %p\n", __FILE__, __FUNCTION__, __LINE__, a); \
  71         pthread_mutex_unlock(a)
  72 #define lock_cleanup_pop(a) \
  73         fprintf(stderr, "%s:%s(%i) unlock %p\n", __FILE__, __FUNCTION__, __LINE__, a); \
  74         pthread_cleanup_pop(1);
  75 #else
  76 #define lock(a) pthread_mutex_lock(a)
  77 #define unlock(a) pthread_mutex_unlock(a)
  78 #define lock_cleanup_pop(a) pthread_cleanup_pop(1);
  79 #endif
  80
  81 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
  82 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
  83
  84 /*
  85  * structs
  86  */
  87 struct vectors * gvecs; /* global copy of vecs for use in sig handlers */
  88
  89 static struct event_thread *
  90 alloc_waiter (void)
  91 {
  92
  93         struct event_thread * wp;
  94
  95         wp = (struct event_thread *)MALLOC(sizeof(struct event_thread));
  96
  97         return wp;
  98 }
  99
 100 static void
 101 free_waiter (void * data)
 102 {
 103         struct event_thread * wp = (struct event_thread *)data;
 104
 105         /*
 106          * indicate in mpp that the wp is already freed storage
 107          */
 108         lock(wp->vecs->lock);
 109
 110         if (wp->mpp)
 111                 /*
 112                  * be careful, mpp may already be freed -- null if so
 113                  */
 114                 wp->mpp->waiter = NULL;
 115         else
 116                 condlog(3, "free_waiter, mpp freed before wp=%p,", wp);
 117
 118         unlock(wp->vecs->lock);
 119
 120         if (wp->dmt)
 121                 dm_task_destroy(wp->dmt);
 122
 123         FREE(wp);
 124 }
 125
 126 static void
 127 stop_waiter_thread (struct multipath * mpp, struct vectors * vecs)
 128 {
 129         struct event_thread * wp = (struct event_thread *)mpp->waiter;
 130
 131         if (!wp) {
 132                 condlog(3, "%s: no waiter thread", mpp->alias);
 133                 return;
 134         }
 135         condlog(2, "%s: stop event checker thread", wp->mapname);
 136         pthread_kill((pthread_t)wp->thread, SIGUSR1);
 137 }
 138
 139 static void
 140 cleanup_lock (void * data)
 141 {
 142         unlock((pthread_mutex_t *)data);
 143 }
 144
 145 /*
 146  * mpp->no_path_retry:
 147  *   -2 (QUEUE) : queue_if_no_path enabled, never turned off
 148  *   -1 (FAIL)  : fail_if_no_path
 149  *    0 (UNDEF) : nothing
 150  *   >0         : queue_if_no_path enabled, turned off after polling n times
 151  */
 152 static void
 153 update_queue_mode_del_path(struct multipath *mpp)
 154 {
 155         if (--mpp->nr_active == 0 && mpp->no_path_retry > 0) {
 156                 /*
 157                  * Enter retry mode.
 158                  * meaning of +1: retry_tick may be decremented in
 159                  *                checkerloop before starting retry.
 160                  */
 161                 mpp->stat_queueing_timeouts++;
 162                 mpp->retry_tick = mpp->no_path_retry * conf->checkint + 1;
 163                 condlog(1, "%s: Entering recovery mode: max_retries=%d",
 164                         mpp->alias, mpp->no_path_retry);
 165         }
 166         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
 167 }
 168
 169 static void
 170 update_queue_mode_add_path(struct multipath *mpp)
 171 {
 172         if (mpp->nr_active++ == 0 && mpp->no_path_retry > 0) {
 173                 /* come back to normal mode from retry mode */
 174                 mpp->retry_tick = 0;
 175                 dm_queue_if_no_path(mpp->alias, 1);
 176                 condlog(2, "%s: queue_if_no_path enabled", mpp->alias);
 177                 condlog(1, "%s: Recovered to normal mode", mpp->alias);
 178         }
 179         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
 180 }
 181
 182 static int
 183 need_switch_pathgroup (struct multipath * mpp, int refresh)
 184 {
 185         struct pathgroup * pgp;
 186         struct path * pp;
 187         int i, j;
 188
 189         if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
 190                 return 0;
 191
 192         /*
 193          * Refresh path priority values
 194          */
 195         if (refresh)
 196                 vector_foreach_slot (mpp->pg, pgp, i)
 197                         vector_foreach_slot (pgp->paths, pp, j)
 198                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 199
 200         mpp->bestpg = select_path_group(mpp);
 201
 202         if (mpp->bestpg != mpp->nextpg)
 203                 return 1;
 204
 205         return 0;
 206 }
 207
 208 static void
 209 switch_pathgroup (struct multipath * mpp)
 210 {
 211         mpp->stat_switchgroup++;
 212         dm_switchgroup(mpp->alias, mpp->bestpg);
 213         condlog(2, "%s: switch to path group #%i",
 214                  mpp->alias, mpp->bestpg);
 215 }
 216
 217 static int
 218 coalesce_maps(struct vectors *vecs, vector nmpv)
 219 {
 220         struct multipath * ompp;
 221         vector ompv = vecs->mpvec;
 222         int i, j;
 223
 224         vector_foreach_slot (ompv, ompp, i) {
 225                 if (!find_mp_by_wwid(nmpv, ompp->wwid)) {
 226                         /*
 227                          * remove all current maps not allowed by the
 228                          * current configuration
 229                          */
 230                         if (dm_flush_map(ompp->alias, DEFAULT_TARGET)) {
 231                                 condlog(0, "%s: unable to flush devmap",
 232                                         ompp->alias);
 233                                 /*
 234                                  * may be just because the device is open
 235                                  */
 236                                 if (!vector_alloc_slot(nmpv))
 237                                         return 1;
 238
 239                                 vector_set_slot(nmpv, ompp);
 240                                 setup_multipath(vecs, ompp);
 241
 242                                 if ((j = find_slot(ompv, (void *)ompp)) != -1)
 243                                         vector_del_slot(ompv, j);
 244
 245                                 continue;
 246                         }
 247                         else {
 248                                 dm_lib_release();
 249                                 condlog(3, "%s devmap removed", ompp->alias);
 250                         }
 251                 }
 252         }
 253         return 0;
 254 }
 255
 256 static int
 257 update_multipath (struct vectors *vecs, char *mapname)
 258 {
 259         struct multipath *mpp;
 260         struct pathgroup  *pgp;
 261         struct path *pp;
 262         int i, j;
 263         int r = 1;
 264
 265         mpp = find_mp_by_alias(vecs->mpvec, mapname);
 266
 267         if (!mpp)
 268                 goto out;
 269
 270         free_pgvec(mpp->pg, KEEP_PATHS);
 271         mpp->pg = NULL;
 272
 273         if (setup_multipath(vecs, mpp))
 274                 goto out; /* mpp freed in setup_multipath */
 275
 276         /*
 277          * compare checkers states with DM states
 278          */
 279         vector_foreach_slot (mpp->pg, pgp, i) {
 280                 vector_foreach_slot (pgp->paths, pp, j) {
 281                         if (pp->dmstate != PSTATE_FAILED)
 282                                 continue;
 283
 284                         if (pp->state != PATH_DOWN) {
 285                                 condlog(2, "%s: mark as failed", pp->dev_t);
 286                                 mpp->stat_path_failures++;
 287                                 pp->state = PATH_DOWN;
 288                                 update_queue_mode_del_path(mpp);
 289
 290                                 /*
 291                                  * if opportune,
 292                                  * schedule the next check earlier
 293                                  */
 294                                 if (pp->tick > conf->checkint)
 295                                         pp->tick = conf->checkint;
 296                         }
 297                 }
 298         }
 299         r = 0;
 300 out:
 301         if (r)
 302                 condlog(0, "failed to update multipath");
 303
 304         return r;
 305 }
 306
 307 static sigset_t unblock_signals(void)
 308 {
 309         sigset_t set, old;
 310
 311         sigemptyset(&set);
 312         sigaddset(&set, SIGHUP);
 313         sigaddset(&set, SIGUSR1);
 314         pthread_sigmask(SIG_UNBLOCK, &set, &old);
 315         return old;
 316 }
 317
 318 /*
 319  * returns the reschedule delay
 320  * negative means *stop*
 321  */
 322 static int
 323 waiteventloop (struct event_thread * waiter)
 324 {
 325         sigset_t set;
 326         int event_nr;
 327         int r;
 328
 329         if (!waiter->event_nr)
 330                 waiter->event_nr = dm_geteventnr(waiter->mapname);
 331
 332         if (!(waiter->dmt = dm_task_create(DM_DEVICE_WAITEVENT))) {
 333                 condlog(0, "%s: devmap event #%i dm_task_create error",
 334                                 waiter->mapname, waiter->event_nr);
 335                 return 1;
 336         }
 337
 338         if (!dm_task_set_name(waiter->dmt, waiter->mapname)) {
 339                 condlog(0, "%s: devmap event #%i dm_task_set_name error",
 340                                 waiter->mapname, waiter->event_nr);
 341                 dm_task_destroy(waiter->dmt);
 342                 return 1;
 343         }
 344
 345         if (waiter->event_nr && !dm_task_set_event_nr(waiter->dmt,
 346                                                       waiter->event_nr)) {
 347                 condlog(0, "%s: devmap event #%i dm_task_set_event_nr error",
 348                                 waiter->mapname, waiter->event_nr);
 349                 dm_task_destroy(waiter->dmt);
 350                 return 1;
 351         }
 352
 353         dm_task_no_open_count(waiter->dmt);
 354
 355         /* accept wait interruption */
 356         set = unblock_signals();
 357
 358         /* interruption spits messages */
 359         dm_shut_log();
 360
 361         /* wait */
 362         r = dm_task_run(waiter->dmt);
 363
 364         /* wait is over : event or interrupt */
 365         pthread_sigmask(SIG_SETMASK, &set, NULL);
 366         //dm_restore_log();
 367
 368         if (!r) /* wait interrupted by signal */
 369                 return -1;
 370
 371         dm_task_destroy(waiter->dmt);
 372         waiter->dmt = NULL;
 373         waiter->event_nr++;
 374
 375         /*
 376          * upon event ...
 377          */
 378         while (1) {
 379                 condlog(3, "%s: devmap event #%i",
 380                                 waiter->mapname, waiter->event_nr);
 381
 382                 /*
 383                  * event might be :
 384                  *
 385                  * 1) a table reload, which means our mpp structure is
 386                  *    obsolete : refresh it through update_multipath()
 387                  * 2) a path failed by DM : mark as such through
 388                  *    update_multipath()
 389                  * 3) map has gone away : stop the thread.
 390                  * 4) a path reinstate : nothing to do
 391                  * 5) a switch group : nothing to do
 392                  */
 393                 pthread_cleanup_push(cleanup_lock, waiter->vecs->lock);
 394                 lock(waiter->vecs->lock);
 395                 r = update_multipath(waiter->vecs, waiter->mapname);
 396                 lock_cleanup_pop(waiter->vecs->lock);
 397
 398                 if (r)
 399                         return -1; /* stop the thread */
 400
 401                 event_nr = dm_geteventnr(waiter->mapname);
 402
 403                 if (waiter->event_nr == event_nr)
 404                         return 1; /* upon problem reschedule 1s later */
 405
 406                 waiter->event_nr = event_nr;
 407         }
 408         return -1; /* never reach there */
 409 }
 410
 411 static void *
 412 waitevent (void * et)
 413 {
 414         int r;
 415         struct event_thread *waiter;
 416
 417         mlockall(MCL_CURRENT | MCL_FUTURE);
 418
 419         waiter = (struct event_thread *)et;
 420         pthread_cleanup_push(free_waiter, et);
 421
 422         while (1) {
 423                 r = waiteventloop(waiter);
 424
 425                 if (r < 0)
 426                         break;
 427
 428                 sleep(r);
 429         }
 430
 431         pthread_cleanup_pop(1);
 432         return NULL;
 433 }
 434
 435 static int
 436 start_waiter_thread (struct multipath * mpp, struct vectors * vecs)
 437 {
 438         pthread_attr_t attr;
 439         struct event_thread * wp;
 440
 441         if (!mpp)
 442                 return 0;
 443
 444         if (pthread_attr_init(&attr))
 445                 goto out;
 446
 447         pthread_attr_setstacksize(&attr, 32 * 1024);
 448         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 449
 450         wp = alloc_waiter();
 451
 452         if (!wp)
 453                 goto out;
 454
 455         mpp->waiter = (void *)wp;
 456         strncpy(wp->mapname, mpp->alias, WWID_SIZE);
 457         wp->vecs = vecs;
 458         wp->mpp = mpp;
 459
 460         if (pthread_create(&wp->thread, &attr, waitevent, wp)) {
 461                 condlog(0, "%s: cannot create event checker", wp->mapname);
 462                 goto out1;
 463         }
 464         condlog(2, "%s: event checker started", wp->mapname);
 465
 466         return 0;
 467 out1:
 468         free_waiter(wp);
 469         mpp->waiter = NULL;
 470 out:
 471         condlog(0, "failed to start waiter thread");
 472         return 1;
 473 }
 474
 475 static int
 476 flush_map(struct multipath * mpp, struct vectors * vecs)
 477 {
 478         /*
 479          * clear references to this map before flushing so we can ignore
 480          * the spurious uevent we may generate with the dm_flush_map call below
 481          */
 482         if (dm_flush_map(mpp->alias, DEFAULT_TARGET)) {
 483                 /*
 484                  * May not really be an error -- if the map was already flushed
 485                  * from the device mapper by dmsetup(8) for instance.
 486                  */
 487                 condlog(0, "%s: can't flush", mpp->alias);
 488                 return 1;
 489         }
 490         else {
 491                 dm_lib_release();
 492                 condlog(3, "%s: devmap removed", mpp->alias);
 493         }
 494
 495         orphan_paths(vecs->pathvec, mpp);
 496         remove_map(mpp, vecs, stop_waiter_thread, 1);
 497
 498         return 0;
 499 }
 500
 501 static int
 502 uev_add_map (char * devname, struct vectors * vecs)
 503 {
 504         condlog(2, "%s: add map (uevent)", devname);
 505         return ev_add_map(devname, vecs);
 506 }
 507
 508 int
 509 ev_add_map (char * devname, struct vectors * vecs)
 510 {
 511         int major, minor;
 512         char dev_t[BLK_DEV_SIZE];
 513         char * alias;
 514         char * refwwid;
 515         struct multipath * mpp;
 516         int map_present;
 517         int r = 1;
 518
 519         if (sscanf(devname, "dm-%d", &minor) == 1 &&
 520             !sysfs_get_dev(sysfs_path, devname, dev_t, BLK_DEV_SIZE) &&
 521             sscanf(dev_t, "%d:%d", &major, &minor) == 2)
 522                 alias = dm_mapname(major, minor);
 523         else
 524                 alias = STRDUP(devname);
 525
 526         if (!alias)
 527                 return 1;
 528
 529         map_present = dm_map_present(alias);
 530
 531         if (map_present && dm_type(alias, DEFAULT_TARGET) <= 0) {
 532                 condlog(4, "%s: not a multipath map", alias);
 533                 FREE(alias);
 534                 return 0;
 535         }
 536
 537         mpp = find_mp_by_alias(vecs->mpvec, alias);
 538
 539         if (mpp) {
 540                 /*
 541                  * Not really an error -- we generate our own uevent
 542                  * if we create a multipath mapped device as a result
 543                  * of uev_add_path
 544                  */
 545                 condlog(0, "%s: devmap already registered",
 546                         devname);
 547                 FREE(alias);
 548                 return 0;
 549         }
 550
 551         /*
 552          * now we can register the map
 553          */
 554         if (map_present && (mpp = add_map_without_path(vecs, minor, alias,
 555                                         start_waiter_thread))) {
 556                 condlog(3, "%s: devmap %s added", alias, devname);
 557                 return 0;
 558         }
 559         refwwid = get_refwwid(devname, DEV_DEVMAP, vecs->pathvec);
 560
 561         if (refwwid) {
 562                 r = coalesce_paths(vecs, NULL, refwwid);
 563                 dm_lib_release();
 564         }
 565
 566         if (!r)
 567                 condlog(3, "%s: devmap %s added", alias, devname);
 568         else
 569                 condlog(0, "%s: uev_add_map %s failed", alias, devname);
 570
 571         FREE(refwwid);
 572         FREE(alias);
 573         return r;
 574 }
 575
 576 static int
 577 uev_remove_map (char * devname, struct vectors * vecs)
 578 {
 579         condlog(2, "%s: remove map (uevent)", devname);
 580         return ev_remove_map(devname, vecs);
 581 }
 582
 583 int
 584 ev_remove_map (char * devname, struct vectors * vecs)
 585 {
 586         struct multipath * mpp;
 587
 588         mpp = find_mp_by_str(vecs->mpvec, devname);
 589
 590         if (!mpp) {
 591                 condlog(3, "%s: devmap not registered, can't remove",
 592                         devname);
 593                 return 0;
 594         }
 595         flush_map(mpp, vecs);
 596
 597         return 0;
 598 }
 599
 600 static int
 601 uev_umount_map (char * devname, struct vectors * vecs)
 602 {
 603         struct multipath * mpp;
 604
 605         condlog(2, "%s: umount map (uevent)", devname);
 606
 607         mpp = find_mp_by_str(vecs->mpvec, devname);
 608
 609         if (!mpp)
 610                 return 0;
 611
 612         update_mpp_paths(mpp, vecs->pathvec);
 613         verify_paths(mpp, vecs, NULL);
 614
 615         if (!VECTOR_SIZE(mpp->paths))
 616                 flush_map(mpp, vecs);
 617
 618         return 0;
 619 }
 620
 621 static int
 622 uev_add_path (char * devname, struct vectors * vecs)
 623 {
 624         condlog(2, "%s: add path (uevent)", devname);
 625         return ev_add_path(devname, vecs);
 626 }
 627
 628 int
 629 ev_add_path (char * devname, struct vectors * vecs)
 630 {
 631         struct multipath * mpp;
 632         struct path * pp;
 633         char empty_buff[WWID_SIZE] = {0};
 634
 635         pp = find_path_by_dev(vecs->pathvec, devname);
 636
 637         if (pp) {
 638                 condlog(0, "%s: spurious uevent, path already in pathvec, %p",
 639                         devname, pp->mpp);
 640                 /*
 641                  * allow reconfig of orphaned path here
 642                  */
 643                 if (pp->mpp) return 1;
 644         }
 645         else {
 646                 /*
 647                  * get path vital state
 648                  */
 649                 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
 650                       devname, DI_ALL))) {
 651                         condlog(0, "%s: failed to store path info", devname);
 652                         return 1;
 653                 }
 654                 pp->checkint = conf->checkint;
 655         }
 656
 657         /*
 658          * need path UID to go any further
 659          */
 660         if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
 661                 condlog(0, "%s: failed to get path uid", devname);
 662                 return 1; /* leave path added to pathvec */
 663         }
 664
 665         mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
 666 rescan:
 667         if (mpp) {
 668                 if (adopt_paths(vecs->pathvec, mpp))
 669                         return 1; /* leave path added to pathvec */
 670
 671                 verify_paths(mpp, vecs, NULL);
 672                 mpp->action = ACT_RELOAD;
 673         }
 674         else {
 675                 if ((mpp = add_map_with_path(vecs, pp, 1)))
 676                         mpp->action = ACT_CREATE;
 677                 else
 678                         return 1; /* leave path added to pathvec */
 679         }
 680
 681         /*
 682          * push the map to the device-mapper
 683          */
 684         if (setup_map(mpp)) {
 685                 condlog(0, "%s: failed to setup map for addition of new "
 686                         "path %s", mpp->alias, devname);
 687                 goto out;
 688         }
 689         /*
 690          * reload the map for the multipath mapped device
 691          */
 692         if (domap(mpp) <= 0) {
 693                 condlog(0, "%s: failed in domap for addition of new "
 694                         "path %s", mpp->alias, devname);
 695                 /*
 696                  * deal with asynchronous uevents :((
 697                  */
 698                 if (mpp->action == ACT_RELOAD) {
 699                         condlog(0, "%s: uev_add_path sleep", mpp->alias);
 700                         sleep(1);
 701                         update_mpp_paths(mpp, vecs->pathvec);
 702                         goto rescan;
 703                 }
 704                 else
 705                         goto out;
 706         }
 707         dm_lib_release();
 708
 709         /*
 710          * update our state from kernel regardless of create or reload
 711          */
 712         if (setup_multipath(vecs, mpp))
 713                 goto out;
 714
 715         if (mpp->action == ACT_CREATE &&
 716             start_waiter_thread(mpp, vecs))
 717                         goto out;
 718
 719         condlog(3, "%s path added to devmap %s", devname, mpp->alias);
 720         return 0;
 721
 722 out:
 723         remove_map(mpp, vecs, NULL, 1);
 724         return 1;
 725 }
 726
 727 static int
 728 uev_remove_path (char * devname, struct vectors * vecs)
 729 {
 730         condlog(2, "%s: remove path (uevent)", devname);
 731         return ev_remove_path(devname, vecs);
 732 }
 733
 734 int
 735 ev_remove_path (char * devname, struct vectors * vecs)
 736 {
 737         struct multipath * mpp;
 738         struct path * pp;
 739         int i;
 740         int rm_path = 1;
 741
 742         pp = find_path_by_dev(vecs->pathvec, devname);
 743
 744         if (!pp) {
 745                 condlog(0, "%s: spurious uevent, path not in pathvec", devname);
 746                 return 1;
 747         }
 748
 749         /*
 750          * avoid referring to the map of an orphanned path
 751          */
 752         if ((mpp = pp->mpp)) {
 753
 754                 /*
 755                  * remove the map IFF removing the last path
 756                  */
 757                 if (pathcount(mpp, PATH_WILD) > 1) {
 758                         vector rpvec = vector_alloc();
 759
 760                         /*
 761                          * transform the mp->pg vector of vectors of paths
 762                          * into a mp->params string to feed the device-mapper
 763                          */
 764                         update_mpp_paths(mpp, vecs->pathvec);
 765                         if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
 766                                 vector_del_slot(mpp->paths, i);
 767
 768                         if (VECTOR_SIZE(mpp->paths) == 0) {
 769                                 char alias[WWID_SIZE];
 770
 771                                 /*
 772                                  * flush_map will fail if the device is open
 773                                  */
 774                                 strncpy(alias, mpp->alias, WWID_SIZE);
 775                                 if (flush_map(mpp, vecs))
 776                                         rm_path = 0;
 777                                 else
 778                                         condlog(3, "%s: removed map after removing"
 779                                                 " multiple paths", alias);
 780                         }
 781                         else {
 782                                 if (setup_map(mpp)) {
 783                                         condlog(0, "%s: failed to setup map for"
 784                                                 " removal of path %s", mpp->alias, devname);
 785                                         free_pathvec(rpvec, KEEP_PATHS);
 786                                         goto out;
 787                                 }
 788                                 /*
 789                                  * reload the map
 790                                  */
 791                                 mpp->action = ACT_RELOAD;
 792                                 if (domap(mpp) <= 0) {
 793                                         condlog(0, "%s: failed in domap for "
 794                                                 "removal of path %s",
 795                                                 mpp->alias, devname);
 796                                         /*
 797                                          * Delete path from pathvec so that
 798                                          * update_mpp_paths wont find it later
 799                                          * when/if another path is removed.
 800                                          */
 801                                         if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
 802                                                 vector_del_slot(vecs->pathvec, i);
 803                                         free_path(pp);
 804                                         return 1;
 805                                 }
 806                                 /*
 807                                  * update our state from kernel
 808                                  */
 809                                 if (setup_multipath(vecs, mpp)) {
 810                                         free_pathvec(rpvec, KEEP_PATHS);
 811                                         goto out;
 812                                 }
 813
 814                                 condlog(3, "%s path removed from devmap %s",
 815                                         devname, mpp->alias);
 816                         }
 817                         free_pathvec(rpvec, KEEP_PATHS);
 818                 }
 819                 else {
 820                         char alias[WWID_SIZE];
 821
 822                         /*
 823                          * flush_map will fail if the device is open
 824                          */
 825                         strncpy(alias, mpp->alias, WWID_SIZE);
 826                         if (flush_map(mpp, vecs))
 827                                 rm_path = 0;
 828                         else
 829                                 condlog(3, "%s: removed map", alias);
 830                 }
 831         }
 832
 833         if (rm_path) {
 834                 if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
 835                         vector_del_slot(vecs->pathvec, i);
 836                 free_path(pp);
 837         }
 838
 839         return 0;
 840
 841 out:
 842         remove_map(mpp, vecs, stop_waiter_thread, 1);
 843         return 1;
 844 }
 845
 846 static int
 847 map_discovery (struct vectors * vecs)
 848 {
 849         int i;
 850         struct multipath * mpp;
 851
 852         if (dm_get_maps(vecs->mpvec, "multipath"))
 853                 return 1;
 854
 855         vector_foreach_slot (vecs->mpvec, mpp, i)
 856                 if (setup_multipath(vecs, mpp))
 857                         return 1;
 858
 859         return 0;
 860 }
 861
 862 int
 863 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 864 {
 865         struct vectors * vecs;
 866         int r;
 867
 868         *reply = NULL;
 869         *len = 0;
 870         vecs = (struct vectors *)trigger_data;
 871
 872         pthread_cleanup_push(cleanup_lock, vecs->lock);
 873         lock(vecs->lock);
 874
 875         r = parse_cmd(str, reply, len, vecs);
 876
 877         if (r > 0) {
 878                 *reply = STRDUP("fail\n");
 879                 *len = strlen(*reply) + 1;
 880                 r = 1;
 881         }
 882         else if (!r && *len == 0) {
 883                 *reply = STRDUP("ok\n");
 884                 *len = strlen(*reply) + 1;
 885                 r = 0;
 886         }
 887         /* else if (r < 0) leave *reply alone */
 888
 889         lock_cleanup_pop(vecs->lock);
 890         return r;
 891 }
 892
 893 static int
 894 uev_discard(char * devpath)
 895 {
 896         char a[10], b[10];
 897
 898         /*
 899          * keep only block devices, discard partitions
 900          */
 901         if (sscanf(devpath, "/block/%10s", a) != 1 ||
 902             sscanf(devpath, "/block/%10[^/]/%10s", a, b) == 2) {
 903                 condlog(4, "discard event on %s", devpath);
 904                 return 1;
 905         }
 906         return 0;
 907 }
 908
 909 int
 910 uev_trigger (struct uevent * uev, void * trigger_data)
 911 {
 912         int r = 0;
 913         char devname[32];
 914         struct vectors * vecs;
 915
 916         vecs = (struct vectors *)trigger_data;
 917
 918         if (uev_discard(uev->devpath))
 919                 return 0;
 920
 921         basename(uev->devpath, devname);
 922         lock(vecs->lock);
 923
 924         /*
 925          * device map add/remove event
 926          */
 927         if (!strncmp(devname, "dm-", 3)) {
 928                 if (!strncmp(uev->action, "add", 3)) {
 929                         r = uev_add_map(devname, vecs);
 930                         goto out;
 931                 }
 932                 if (!strncmp(uev->action, "remove", 6)) {
 933                         r = uev_remove_map(devname, vecs);
 934                         goto out;
 935                 }
 936                 if (!strncmp(uev->action, "umount", 6)) {
 937                         r = uev_umount_map(devname, vecs);
 938                         goto out;
 939                 }
 940                 goto out;
 941         }
 942
 943         /*
 944          * path add/remove event
 945          */
 946         if (blacklist(conf->blist_devnode, devname))
 947                 goto out;
 948
 949         if (!strncmp(uev->action, "add", 3)) {
 950                 r = uev_add_path(devname, vecs);
 951                 goto out;
 952         }
 953         if (!strncmp(uev->action, "remove", 6)) {
 954                 r = uev_remove_path(devname, vecs);
 955                 goto out;
 956         }
 957
 958 out:
 959         unlock(vecs->lock);
 960         return r;
 961 }
 962
 963 static void *
 964 ueventloop (void * ap)
 965 {
 966         if (uevent_listen(&uev_trigger, ap))
 967                 fprintf(stderr, "error starting uevent listener");
 968
 969         return NULL;
 970 }
 971
 972 static void *
 973 uxlsnrloop (void * ap)
 974 {
 975         if (load_keys())
 976                 return NULL;
 977
 978         if (alloc_handlers())
 979                 return NULL;
 980
 981         add_handler(LIST+PATHS, cli_list_paths);
 982         add_handler(LIST+MAPS, cli_list_maps);
 983         add_handler(LIST+MAPS+STATUS, cli_list_maps_status);
 984         add_handler(LIST+MAPS+STATS, cli_list_maps_stats);
 985         add_handler(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
 986         add_handler(LIST+TOPOLOGY, cli_list_maps_topology);
 987         add_handler(LIST+MAP+TOPOLOGY, cli_list_map_topology);
 988         add_handler(LIST+CONFIG, cli_list_config);
 989         add_handler(ADD+PATH, cli_add_path);
 990         add_handler(DEL+PATH, cli_del_path);
 991         add_handler(ADD+MAP, cli_add_map);
 992         add_handler(DEL+MAP, cli_del_map);
 993         add_handler(SWITCH+MAP+GROUP, cli_switch_group);
 994         add_handler(RECONFIGURE, cli_reconfigure);
 995         add_handler(SUSPEND+MAP, cli_suspend);
 996         add_handler(RESUME+MAP, cli_resume);
 997         add_handler(REINSTATE+PATH, cli_reinstate);
 998         add_handler(FAIL+PATH, cli_fail);
 999
1000         uxsock_listen(&uxsock_trigger, ap);
1001
1002         return NULL;
1003 }
1004
1005 static int
1006 exit_daemon (int status)
1007 {
1008         if (status != 0)
1009                 fprintf(stderr, "bad exit status. see daemon.log\n");
1010
1011         condlog(3, "unlink pidfile");
1012         unlink(DEFAULT_PIDFILE);
1013
1014         lock(&exit_mutex);
1015         pthread_cond_signal(&exit_cond);
1016         unlock(&exit_mutex);
1017
1018         return status;
1019 }
1020
1021 static void
1022 fail_path (struct path * pp)
1023 {
1024         if (!pp->mpp)
1025                 return;
1026
1027         condlog(2, "checker failed path %s in map %s",
1028                  pp->dev_t, pp->mpp->alias);
1029
1030         dm_fail_path(pp->mpp->alias, pp->dev_t);
1031         update_queue_mode_del_path(pp->mpp);
1032 }
1033
1034 /*
1035  * caller must have locked the path list before calling that function
1036  */
1037 static void
1038 reinstate_path (struct path * pp)
1039 {
1040         if (!pp->mpp)
1041                 return;
1042
1043         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
1044                 condlog(0, "%s: reinstate failed", pp->dev_t);
1045         else {
1046                 condlog(2, "%s: reinstated", pp->dev_t);
1047                 update_queue_mode_add_path(pp->mpp);
1048         }
1049 }
1050
1051 static void
1052 enable_group(struct path * pp)
1053 {
1054         struct pathgroup * pgp;
1055
1056         /*
1057          * if path is added through uev_add_path, pgindex can be unset.
1058          * next update_strings() will set it, upon map reload event.
1059          *
1060          * we can safely return here, because upon map reload, all
1061          * PG will be enabled.
1062          */
1063         if (!pp->mpp->pg || !pp->pgindex)
1064                 return;
1065
1066         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
1067
1068         if (pgp->status == PGSTATE_DISABLED) {
1069                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
1070                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
1071         }
1072 }
1073
1074 static void
1075 mpvec_garbage_collector (struct vectors * vecs)
1076 {
1077         struct multipath * mpp;
1078         int i;
1079
1080         vector_foreach_slot (vecs->mpvec, mpp, i) {
1081                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
1082                         condlog(2, "%s: remove dead map", mpp->alias);
1083                         remove_map(mpp, vecs, stop_waiter_thread, 1);
1084                         i--;
1085                 }
1086         }
1087 }
1088
1089 static void
1090 defered_failback_tick (vector mpvec)
1091 {
1092         struct multipath * mpp;
1093         int i;
1094
1095         vector_foreach_slot (mpvec, mpp, i) {
1096                 /*
1097                  * defered failback getting sooner
1098                  */
1099                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
1100                         mpp->failback_tick--;
1101
1102                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
1103                                 switch_pathgroup(mpp);
1104                 }
1105         }
1106 }
1107
1108 static void
1109 retry_count_tick(vector mpvec)
1110 {
1111         struct multipath *mpp;
1112         int i;
1113
1114         vector_foreach_slot (mpvec, mpp, i) {
1115                 if (mpp->retry_tick) {
1116                         mpp->stat_total_queueing_time++;
1117                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
1118                         if(--mpp->retry_tick == 0) {
1119                                 dm_queue_if_no_path(mpp->alias, 0);
1120                                 condlog(2, "%s: Disable queueing", mpp->alias);
1121                         }
1122                 }
1123         }
1124 }
1125
1126 static void *
1127 checkerloop (void *ap)
1128 {
1129         struct vectors *vecs;
1130         struct path *pp;
1131         int i, count = 0;
1132         int newstate;
1133
1134         mlockall(MCL_CURRENT | MCL_FUTURE);
1135         vecs = (struct vectors *)ap;
1136         condlog(2, "path checkers start up");
1137
1138         /*
1139          * init the path check interval
1140          */
1141         vector_foreach_slot (vecs->pathvec, pp, i) {
1142                 pp->checkint = conf->checkint;
1143         }
1144
1145         while (1) {
1146                 pthread_cleanup_push(cleanup_lock, vecs->lock);
1147                 lock(vecs->lock);
1148                 condlog(4, "tick");
1149
1150                 vector_foreach_slot (vecs->pathvec, pp, i) {
1151                         if (!pp->mpp)
1152                                 continue;
1153
1154                         if (pp->tick && --pp->tick)
1155                                 continue; /* don't check this path yet */
1156
1157                         /*
1158                          * provision a next check soonest,
1159                          * in case we exit abnormaly from here
1160                          */
1161                         pp->tick = conf->checkint;
1162
1163                         if (!checker_selected(&pp->checker)) {
1164                                 pathinfo(pp, conf->hwtable, DI_SYSFS);
1165                                 select_checker(pp);
1166                         }
1167
1168                         if (!checker_selected(&pp->checker)) {
1169                                 condlog(0, "%s: checker is not set", pp->dev);
1170                                 continue;
1171                         }
1172                         newstate = checker_check(&pp->checker);
1173
1174                         if (newstate < 0) {
1175                                 condlog(2, "%s: unusable path", pp->dev);
1176                                 pathinfo(pp, conf->hwtable, 0);
1177                                 continue;
1178                         }
1179
1180                         if (newstate != pp->state) {
1181                                 pp->state = newstate;
1182                                 LOG_MSG(1, checker_message(&pp->checker));
1183
1184                                 /*
1185                                  * upon state change, reset the checkint
1186                                  * to the shortest delay
1187                                  */
1188                                 pp->checkint = conf->checkint;
1189
1190                                 if (newstate == PATH_DOWN ||
1191                                     newstate == PATH_SHAKY ||
1192                                     update_multipath_strings(pp->mpp,
1193                                                              vecs->pathvec)) {
1194                                         /*
1195                                          * proactively fail path in the DM
1196                                          */
1197                                         fail_path(pp);
1198
1199                                         /*
1200                                          * cancel scheduled failback
1201                                          */
1202                                         pp->mpp->failback_tick = 0;
1203
1204                                         pp->mpp->stat_path_failures++;
1205                                         continue;
1206                                 }
1207
1208                                 /*
1209                                  * reinstate this path
1210                                  */
1211                                 reinstate_path(pp);
1212
1213                                 /*
1214                                  * schedule [defered] failback
1215                                  */
1216                                 if (pp->mpp->pgfailback > 0)
1217                                         pp->mpp->failback_tick =
1218                                                 pp->mpp->pgfailback + 1;
1219                                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
1220                                     need_switch_pathgroup(pp->mpp, 1))
1221                                         switch_pathgroup(pp->mpp);
1222
1223                                 /*
1224                                  * if at least one path is up in a group, and
1225                                  * the group is disabled, re-enable it
1226                                  */
1227                                 if (newstate == PATH_UP)
1228                                         enable_group(pp);
1229                         }
1230                         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1231                                 LOG_MSG(4, checker_message(&pp->checker));
1232                                 /*
1233                                  * double the next check delay.
1234                                  * max at conf->max_checkint
1235                                  */
1236                                 if (pp->checkint < (conf->max_checkint / 2))
1237                                         pp->checkint = 2 * pp->checkint;
1238                                 else
1239                                         pp->checkint = conf->max_checkint;
1240
1241                                 pp->tick = pp->checkint;
1242                                 condlog(4, "%s: delay next check %is",
1243                                                 pp->dev_t, pp->tick);
1244
1245                         }
1246                         pp->state = newstate;
1247
1248                         /*
1249                          * path prio refreshing
1250                          */
1251                         condlog(4, "path prio refresh");
1252                         pathinfo(pp, conf->hwtable, DI_PRIO);
1253
1254                         if (need_switch_pathgroup(pp->mpp, 0)) {
1255                                 if (pp->mpp->pgfailback > 0)
1256                                         pp->mpp->failback_tick =
1257                                                 pp->mpp->pgfailback + 1;
1258                                 else if (pp->mpp->pgfailback ==
1259                                                 -FAILBACK_IMMEDIATE)
1260                                         switch_pathgroup(pp->mpp);
1261                         }
1262                 }
1263                 defered_failback_tick(vecs->mpvec);
1264                 retry_count_tick(vecs->mpvec);
1265
1266                 if (count)
1267                         count--;
1268                 else {
1269                         condlog(4, "map garbage collection");
1270                         mpvec_garbage_collector(vecs);
1271                         count = MAPGCINT;
1272                 }
1273
1274                 lock_cleanup_pop(vecs->lock);
1275                 sleep(1);
1276         }
1277         return NULL;
1278 }
1279
1280 int
1281 configure (struct vectors * vecs, int start_waiters)
1282 {
1283         struct multipath * mpp;
1284         struct path * pp;
1285         vector mpvec;
1286         int i;
1287
1288         if (!(vecs->pathvec = vector_alloc()))
1289                 return 1;
1290
1291         if (!(vecs->mpvec = vector_alloc()))
1292                 return 1;
1293
1294         if (!(mpvec = vector_alloc()))
1295                 return 1;
1296
1297         /*
1298          * probe for current path (from sysfs) and map (from dm) sets
1299          */
1300         path_discovery(vecs->pathvec, conf, DI_ALL);
1301
1302         vector_foreach_slot (vecs->pathvec, pp, i)
1303                 pp->checkint = conf->checkint;
1304
1305         if (map_discovery(vecs))
1306                 return 1;
1307
1308         /*
1309          * create new set of maps & push changed ones into dm
1310          */
1311         if (coalesce_paths(vecs, mpvec, NULL))
1312                 return 1;
1313
1314         /*
1315          * may need to remove some maps which are no longer relevant
1316          * e.g., due to blacklist changes in conf file
1317          */
1318         if (coalesce_maps(vecs, mpvec))
1319                 return 1;
1320
1321         dm_lib_release();
1322
1323         if (conf->verbosity > 2)
1324                 vector_foreach_slot(mpvec, mpp, i)
1325                         print_map(mpp);
1326
1327         /*
1328          * purge dm of old maps
1329          */
1330         remove_maps(vecs, NULL);
1331
1332         /*
1333          * save new set of maps formed by considering current path state
1334          */
1335         vecs->mpvec = mpvec;
1336
1337         /*
1338          * start dm event waiter threads for these new maps
1339          */
1340         vector_foreach_slot(vecs->mpvec, mpp, i) {
1341                 if (setup_multipath(vecs, mpp))
1342                         return 1;
1343                 if (start_waiters)
1344                         if (start_waiter_thread(mpp, vecs))
1345                                 return 1;
1346         }
1347         return 0;
1348 }
1349
1350 int
1351 reconfigure (struct vectors * vecs)
1352 {
1353         struct config * old = conf;
1354
1355         /*
1356          * free old map and path vectors ... they use old conf state
1357          */
1358         if (VECTOR_SIZE(vecs->mpvec))
1359                 remove_maps(vecs, stop_waiter_thread);
1360
1361         if (VECTOR_SIZE(vecs->pathvec))
1362                 free_pathvec(vecs->pathvec, FREE_PATHS);
1363
1364         conf = NULL;
1365
1366         if (load_config(DEFAULT_CONFIGFILE))
1367                 return 1;
1368
1369         conf->verbosity = old->verbosity;
1370
1371         if (!conf->checkint) {
1372                 conf->checkint = DEFAULT_CHECKINT;
1373                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1374         }
1375         configure(vecs, 1);
1376         free_config(old);
1377         return 0;
1378 }
1379
1380 static struct vectors *
1381 init_vecs (void)
1382 {
1383         struct vectors * vecs;
1384
1385         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1386
1387         if (!vecs)
1388                 return NULL;
1389
1390         vecs->lock =
1391                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1392
1393         if (!vecs->lock)
1394                 goto out;
1395
1396         vecs->pathvec = vector_alloc();
1397
1398         if (!vecs->pathvec)
1399                 goto out1;
1400
1401         vecs->mpvec = vector_alloc();
1402
1403         if (!vecs->mpvec)
1404                 goto out2;
1405
1406         pthread_mutex_init(vecs->lock, NULL);
1407
1408         return vecs;
1409
1410 out2:
1411         vector_free(vecs->pathvec);
1412 out1:
1413         FREE(vecs->lock);
1414 out:
1415         FREE(vecs);
1416         condlog(0, "failed to init paths");
1417         return NULL;
1418 }
1419
1420 static void *
1421 signal_set(int signo, void (*func) (int))
1422 {
1423         int r;
1424         struct sigaction sig;
1425         struct sigaction osig;
1426
1427         sig.sa_handler = func;
1428         sigemptyset(&sig.sa_mask);
1429         sig.sa_flags = 0;
1430
1431         r = sigaction(signo, &sig, &osig);
1432
1433         if (r < 0)
1434                 return (SIG_ERR);
1435         else
1436                 return (osig.sa_handler);
1437 }
1438
1439 static void
1440 sighup (int sig)
1441 {
1442         condlog(2, "reconfigure (SIGHUP)");
1443
1444         lock(gvecs->lock);
1445         reconfigure(gvecs);
1446         unlock(gvecs->lock);
1447
1448 #ifdef _DEBUG_
1449         dbg_free_final(NULL);
1450 #endif
1451 }
1452
1453 static void
1454 sigend (int sig)
1455 {
1456         exit_daemon(0);
1457 }
1458
1459 static void
1460 sigusr1 (int sig)
1461 {
1462         condlog(3, "SIGUSR1 received");
1463 }
1464
1465 static void
1466 signal_init(void)
1467 {
1468         signal_set(SIGHUP, sighup);
1469         signal_set(SIGUSR1, sigusr1);
1470         signal_set(SIGINT, sigend);
1471         signal_set(SIGTERM, sigend);
1472         signal_set(SIGKILL, sigend);
1473 }
1474
1475 static void
1476 setscheduler (void)
1477 {
1478         int res;
1479         static struct sched_param sched_param = {
1480                 sched_priority: 99
1481         };
1482
1483         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1484
1485         if (res == -1)
1486                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1487         return;
1488 }
1489
1490 static void
1491 set_oom_adj (int val)
1492 {
1493         FILE *fp;
1494
1495         fp = fopen("/proc/self/oom_adj", "w");
1496
1497         if (!fp)
1498                 return;
1499
1500         fprintf(fp, "%i", val);
1501         fclose(fp);
1502 }
1503
1504 static int
1505 child (void * param)
1506 {
1507         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1508         pthread_attr_t attr;
1509         struct vectors * vecs;
1510
1511         mlockall(MCL_CURRENT | MCL_FUTURE);
1512
1513         if (logsink)
1514                 log_thread_start();
1515
1516         condlog(2, "--------start up--------");
1517         condlog(2, "read " DEFAULT_CONFIGFILE);
1518
1519         if (load_config(DEFAULT_CONFIGFILE))
1520                 exit(1);
1521
1522         setlogmask(LOG_UPTO(conf->verbosity + 3));
1523
1524         /*
1525          * fill the voids left in the config file
1526          */
1527         if (!conf->checkint) {
1528                 conf->checkint = DEFAULT_CHECKINT;
1529                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1530         }
1531
1532         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1533                 if (logsink)
1534                         log_thread_stop();
1535
1536                 exit(1);
1537         }
1538         signal_init();
1539         setscheduler();
1540         set_oom_adj(-16);
1541         vecs = gvecs = init_vecs();
1542
1543         if (!vecs)
1544                 exit(1);
1545
1546         if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
1547                 condlog(0, "can not find sysfs mount point");
1548                 exit(1);
1549         }
1550
1551         /*
1552          * fetch and configure both paths and multipaths
1553          */
1554         if (configure(vecs, 1)) {
1555                 condlog(0, "failure during configuration");
1556                 exit(1);
1557         }
1558
1559         /*
1560          * start threads
1561          */
1562         pthread_attr_init(&attr);
1563         pthread_attr_setstacksize(&attr, 64 * 1024);
1564         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
1565
1566         pthread_create(&check_thr, &attr, checkerloop, vecs);
1567         pthread_create(&uevent_thr, &attr, ueventloop, vecs);
1568         pthread_create(&uxlsnr_thr, &attr, uxlsnrloop, vecs);
1569
1570         pthread_cond_wait(&exit_cond, &exit_mutex);
1571
1572         /*
1573          * exit path
1574          */
1575         lock(vecs->lock);
1576         remove_maps(vecs, stop_waiter_thread);
1577         free_pathvec(vecs->pathvec, FREE_PATHS);
1578
1579         pthread_cancel(check_thr);
1580         pthread_cancel(uevent_thr);
1581         pthread_cancel(uxlsnr_thr);
1582
1583         free_keys(keys);
1584         keys = NULL;
1585         free_handlers(handlers);
1586         handlers = NULL;
1587         free_polls();
1588
1589         unlock(vecs->lock);
1590         pthread_mutex_destroy(vecs->lock);
1591         FREE(vecs->lock);
1592         vecs->lock = NULL;
1593         FREE(vecs);
1594         vecs = NULL;
1595         free_config(conf);
1596         conf = NULL;
1597
1598         condlog(2, "--------shut down-------");
1599
1600         if (logsink)
1601                 log_thread_stop();
1602
1603         dm_lib_release();
1604         dm_lib_exit();
1605
1606 #ifdef _DEBUG_
1607         dbg_free_final(NULL);
1608 #endif
1609
1610         exit(0);
1611 }
1612
1613 static int
1614 daemonize(void)
1615 {
1616         int pid;
1617         int in_fd, out_fd;
1618
1619         if( (pid = fork()) < 0){
1620                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1621                 return -1;
1622         }
1623         else if (pid != 0)
1624                 return pid;
1625
1626         setsid();
1627
1628         if ( (pid = fork()) < 0)
1629                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1630         else if (pid != 0)
1631                 _exit(0);
1632
1633         in_fd = open("/dev/null", O_RDONLY);
1634         if (in_fd < 0){
1635                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1636                         strerror(errno));
1637                 _exit(0);
1638         }
1639         out_fd = open("/dev/console", O_WRONLY);
1640         if (out_fd < 0){
1641                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1642                         strerror(errno));
1643                 _exit(0);
1644         }
1645
1646         close(STDIN_FILENO);
1647         dup(in_fd);
1648         close(STDOUT_FILENO);
1649         dup(out_fd);
1650         close(STDERR_FILENO);
1651         dup(out_fd);
1652
1653         close(in_fd);
1654         close(out_fd);
1655         chdir("/");
1656         umask(0);
1657         return 0;
1658 }
1659
1660 int
1661 main (int argc, char *argv[])
1662 {
1663         extern char *optarg;
1664         extern int optind;
1665         int arg;
1666         int err;
1667
1668         logsink = 1;
1669
1670         if (getuid() != 0) {
1671                 fprintf(stderr, "need to be root\n");
1672                 exit(1);
1673         }
1674
1675         /* make sure we don't lock any path */
1676         chdir("/");
1677         umask(umask(077) | 022);
1678
1679         conf = alloc_config();
1680
1681         if (!conf)
1682                 exit(1);
1683
1684         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1685         switch(arg) {
1686                 case 'd':
1687                         logsink = 0;
1688                         //debug=1; /* ### comment me out ### */
1689                         break;
1690                 case 'v':
1691                         if (sizeof(optarg) > sizeof(char *) ||
1692                             !isdigit(optarg[0]))
1693                                 exit(1);
1694
1695                         conf->verbosity = atoi(optarg);
1696                         break;
1697                 case 'k':
1698                         uxclnt(optarg);
1699                         exit(0);
1700                 default:
1701                         ;
1702                 }
1703         }
1704
1705         if (!logsink)
1706                 err = 0;
1707         else
1708                 err = daemonize();
1709
1710         if (err < 0)
1711                 /* error */
1712                 exit(1);
1713         else if (err > 0)
1714                 /* parent dies */
1715                 exit(0);
1716         else
1717                 /* child lives */
1718                 return (child(NULL));
1719 }
1720