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