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                 return 1; /* 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))
 421                         return 1; /* 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                         return 1; /* 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 out;
 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 out;
 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 out;
 478
 479         sync_map_state(mpp);
 480
 481         if (mpp->action == ACT_CREATE &&
 482             start_waiter_thread(mpp, vecs))
 483                         goto out;
 484
 485         condlog(2, "%s path added to devmap %s", devname, mpp->alias);
 486         return 0;
 487
 488 out:
 489         remove_map(mpp, vecs, 1);
 490         return 1;
 491 }
 492
 493 static int
 494 uev_remove_path (struct sysfs_device * dev, struct vectors * vecs)
 495 {
 496         int retval;
 497
 498         condlog(2, "%s: remove path (uevent)", dev->kernel);
 499         retval = ev_remove_path(dev->kernel, vecs);
 500         if (!retval)
 501                 sysfs_device_put(dev);
 502
 503         return retval;
 504 }
 505
 506 int
 507 ev_remove_path (char * devname, struct vectors * vecs)
 508 {
 509         struct multipath * mpp;
 510         struct path * pp;
 511         int i, retval = 0;
 512
 513         pp = find_path_by_dev(vecs->pathvec, devname);
 514
 515         if (!pp) {
 516                 /* Not an error; path might have been purged earlier */
 517                 condlog(0, "%s: path already removed", devname);
 518                 return 0;
 519         }
 520
 521         /*
 522          * avoid referring to the map of an orphaned path
 523          */
 524         if ((mpp = pp->mpp)) {
 525                 /*
 526                  * transform the mp->pg vector of vectors of paths
 527                  * into a mp->params string to feed the device-mapper
 528                  */
 529                 if (update_mpp_paths(mpp, vecs->pathvec)) {
 530                         condlog(0, "%s: failed to update paths",
 531                                 mpp->alias);
 532                         goto fail;
 533                 }
 534                 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
 535                         vector_del_slot(mpp->paths, i);
 536
 537                 /*
 538                  * remove the map IFF removing the last path
 539                  */
 540                 if (VECTOR_SIZE(mpp->paths) == 0) {
 541                         char alias[WWID_SIZE];
 542
 543                         /*
 544                          * flush_map will fail if the device is open
 545                          */
 546                         strncpy(alias, mpp->alias, WWID_SIZE);
 547                         if (mpp->flush_on_last_del == FLUSH_ENABLED) {
 548                                 condlog(2, "%s Last path deleted, disabling queueing", mpp->alias);
 549                                 mpp->retry_tick = 0;
 550                                 mpp->no_path_retry = NO_PATH_RETRY_FAIL;
 551                                 mpp->flush_on_last_del = FLUSH_IN_PROGRESS;
 552                                 dm_queue_if_no_path(mpp->alias, 0);
 553                         }
 554                         if (!flush_map(mpp, vecs)) {
 555                                 condlog(2, "%s: removed map after"
 556                                         " removing all paths",
 557                                         alias);
 558                                 retval = 0;
 559                                 goto out;
 560                         }
 561                         /*
 562                          * Not an error, continue
 563                          */
 564                 }
 565
 566                 if (setup_map(mpp)) {
 567                         condlog(0, "%s: failed to setup map for"
 568                                 " removal of path %s", mpp->alias,
 569                                 devname);
 570                         goto fail;
 571                 }
 572                 /*
 573                  * reload the map
 574                  */
 575                 mpp->action = ACT_RELOAD;
 576                 if (domap(mpp) <= 0) {
 577                         condlog(0, "%s: failed in domap for "
 578                                 "removal of path %s",
 579                                 mpp->alias, devname);
 580                         retval = 1;
 581                 } else {
 582                         /*
 583                          * update our state from kernel
 584                          */
 585                         if (setup_multipath(vecs, mpp)) {
 586                                 goto fail;
 587                         }
 588                         sync_map_state(mpp);
 589
 590                         condlog(2, "%s: path removed from map %s",
 591                                 devname, mpp->alias);
 592                 }
 593         }
 594
 595 out:
 596         if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
 597                 vector_del_slot(vecs->pathvec, i);
 598
 599         free_path(pp);
 600
 601         return retval;
 602
 603 fail:
 604         remove_map_and_stop_waiter(mpp, vecs, 1);
 605         return 1;
 606 }
 607
 608 static int
 609 map_discovery (struct vectors * vecs)
 610 {
 611         struct multipath * mpp;
 612         unsigned int i;
 613
 614         if (dm_get_maps(vecs->mpvec))
 615                 return 1;
 616
 617         vector_foreach_slot (vecs->mpvec, mpp, i)
 618                 if (setup_multipath(vecs, mpp))
 619                         return 1;
 620
 621         return 0;
 622 }
 623
 624 int
 625 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 626 {
 627         struct vectors * vecs;
 628         int r;
 629
 630         *reply = NULL;
 631         *len = 0;
 632         vecs = (struct vectors *)trigger_data;
 633
 634         pthread_cleanup_push(cleanup_lock, &vecs->lock);
 635         lock(vecs->lock);
 636
 637         r = parse_cmd(str, reply, len, vecs);
 638
 639         if (r > 0) {
 640                 *reply = STRDUP("fail\n");
 641                 *len = strlen(*reply) + 1;
 642                 r = 1;
 643         }
 644         else if (!r && *len == 0) {
 645                 *reply = STRDUP("ok\n");
 646                 *len = strlen(*reply) + 1;
 647                 r = 0;
 648         }
 649         /* else if (r < 0) leave *reply alone */
 650
 651         lock_cleanup_pop(vecs->lock);
 652         return r;
 653 }
 654
 655 static int
 656 uev_discard(char * devpath)
 657 {
 658         char *tmp;
 659         char a[11], b[11];
 660
 661         /*
 662          * keep only block devices, discard partitions
 663          */
 664         tmp = strstr(devpath, "/block/");
 665         if (tmp == NULL){
 666                 condlog(4, "no /block/ in '%s'", devpath);
 667                 return 1;
 668         }
 669         if (sscanf(tmp, "/block/%10s", a) != 1 ||
 670             sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
 671                 condlog(4, "discard event on %s", devpath);
 672                 return 1;
 673         }
 674         return 0;
 675 }
 676
 677 int
 678 uev_trigger (struct uevent * uev, void * trigger_data)
 679 {
 680         int r = 0;
 681         struct sysfs_device *sysdev;
 682         struct vectors * vecs;
 683
 684         vecs = (struct vectors *)trigger_data;
 685
 686         if (uev_discard(uev->devpath))
 687                 return 0;
 688
 689         sysdev = sysfs_device_get(uev->devpath);
 690         if(!sysdev)
 691                 return 0;
 692
 693         lock(vecs->lock);
 694
 695         /*
 696          * device map event
 697          * Add events are ignored here as the tables
 698          * are not fully initialised then.
 699          */
 700         if (!strncmp(sysdev->kernel, "dm-", 3)) {
 701                 if (!strncmp(uev->action, "change", 6)) {
 702                         r = uev_add_map(sysdev, vecs);
 703                         goto out;
 704                 }
 705                 if (!strncmp(uev->action, "remove", 6)) {
 706                         r = uev_remove_map(sysdev, vecs);
 707                         goto out;
 708                 }
 709                 if (!strncmp(uev->action, "umount", 6)) {
 710                         r = uev_umount_map(sysdev, vecs);
 711                         goto out;
 712                 }
 713                 goto out;
 714         }
 715
 716         /*
 717          * path add/remove event
 718          */
 719         if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
 720                            sysdev->kernel) > 0)
 721                 goto out;
 722
 723         if (!strncmp(uev->action, "add", 3)) {
 724                 r = uev_add_path(sysdev, vecs);
 725                 goto out;
 726         }
 727         if (!strncmp(uev->action, "remove", 6)) {
 728                 r = uev_remove_path(sysdev, vecs);
 729                 goto out;
 730         }
 731
 732 out:
 733         unlock(vecs->lock);
 734         return r;
 735 }
 736
 737 static void *
 738 ueventloop (void * ap)
 739 {
 740         block_signal(SIGUSR1, NULL);
 741         block_signal(SIGHUP, NULL);
 742
 743         if (uevent_listen(&uev_trigger, ap))
 744                 fprintf(stderr, "error starting uevent listener");
 745
 746         return NULL;
 747 }
 748
 749 static void *
 750 uxlsnrloop (void * ap)
 751 {
 752         block_signal(SIGUSR1, NULL);
 753         block_signal(SIGHUP, NULL);
 754
 755         if (cli_init())
 756                 return NULL;
 757
 758         set_handler_callback(LIST+PATHS, cli_list_paths);
 759         set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
 760         set_handler_callback(LIST+MAPS, cli_list_maps);
 761         set_handler_callback(LIST+STATUS, cli_list_status);
 762         set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
 763         set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
 764         set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
 765         set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
 766         set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
 767         set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
 768         set_handler_callback(LIST+CONFIG, cli_list_config);
 769         set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
 770         set_handler_callback(LIST+DEVICES, cli_list_devices);
 771         set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
 772         set_handler_callback(ADD+PATH, cli_add_path);
 773         set_handler_callback(DEL+PATH, cli_del_path);
 774         set_handler_callback(ADD+MAP, cli_add_map);
 775         set_handler_callback(DEL+MAP, cli_del_map);
 776         set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
 777         set_handler_callback(RECONFIGURE, cli_reconfigure);
 778         set_handler_callback(SUSPEND+MAP, cli_suspend);
 779         set_handler_callback(RESUME+MAP, cli_resume);
 780         set_handler_callback(RESIZE+MAP, cli_resize);
 781         set_handler_callback(REINSTATE+PATH, cli_reinstate);
 782         set_handler_callback(FAIL+PATH, cli_fail);
 783         set_handler_callback(DISABLEQ+MAP, cli_disable_queueing);
 784         set_handler_callback(RESTOREQ+MAP, cli_restore_queueing);
 785         set_handler_callback(DISABLEQ+MAPS, cli_disable_all_queueing);
 786         set_handler_callback(RESTOREQ+MAPS, cli_restore_all_queueing);
 787         set_handler_callback(QUIT, cli_quit);
 788
 789         umask(077);
 790         uxsock_listen(&uxsock_trigger, ap);
 791
 792         return NULL;
 793 }
 794
 795 static int
 796 exit_daemon (int status)
 797 {
 798         if (status != 0)
 799                 fprintf(stderr, "bad exit status. see daemon.log\n");
 800
 801         condlog(3, "unlink pidfile");
 802         unlink(DEFAULT_PIDFILE);
 803
 804         pthread_mutex_lock(&exit_mutex);
 805         pthread_cond_signal(&exit_cond);
 806         pthread_mutex_unlock(&exit_mutex);
 807
 808         return status;
 809 }
 810
 811 static void
 812 fail_path (struct path * pp, int del_active)
 813 {
 814         if (!pp->mpp)
 815                 return;
 816
 817         condlog(2, "checker failed path %s in map %s",
 818                  pp->dev_t, pp->mpp->alias);
 819
 820         dm_fail_path(pp->mpp->alias, pp->dev_t);
 821         if (del_active)
 822                 update_queue_mode_del_path(pp->mpp);
 823 }
 824
 825 /*
 826  * caller must have locked the path list before calling that function
 827  */
 828 static void
 829 reinstate_path (struct path * pp, int add_active)
 830 {
 831         if (!pp->mpp)
 832                 return;
 833
 834         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
 835                 condlog(0, "%s: reinstate failed", pp->dev_t);
 836         else {
 837                 condlog(2, "%s: reinstated", pp->dev_t);
 838                 if (add_active)
 839                         update_queue_mode_add_path(pp->mpp);
 840         }
 841 }
 842
 843 static void
 844 enable_group(struct path * pp)
 845 {
 846         struct pathgroup * pgp;
 847
 848         /*
 849          * if path is added through uev_add_path, pgindex can be unset.
 850          * next update_strings() will set it, upon map reload event.
 851          *
 852          * we can safely return here, because upon map reload, all
 853          * PG will be enabled.
 854          */
 855         if (!pp->mpp->pg || !pp->pgindex)
 856                 return;
 857
 858         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
 859
 860         if (pgp->status == PGSTATE_DISABLED) {
 861                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
 862                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
 863         }
 864 }
 865
 866 static void
 867 mpvec_garbage_collector (struct vectors * vecs)
 868 {
 869         struct multipath * mpp;
 870         unsigned int i;
 871
 872         if (!vecs->mpvec)
 873                 return;
 874
 875         vector_foreach_slot (vecs->mpvec, mpp, i) {
 876                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
 877                         condlog(2, "%s: remove dead map", mpp->alias);
 878                         remove_map_and_stop_waiter(mpp, vecs, 1);
 879                         i--;
 880                 }
 881         }
 882 }
 883
 884 static void
 885 defered_failback_tick (vector mpvec)
 886 {
 887         struct multipath * mpp;
 888         unsigned int i;
 889
 890         vector_foreach_slot (mpvec, mpp, i) {
 891                 /*
 892                  * defered failback getting sooner
 893                  */
 894                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
 895                         mpp->failback_tick--;
 896
 897                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
 898                                 switch_pathgroup(mpp);
 899                 }
 900         }
 901 }
 902
 903 static void
 904 retry_count_tick(vector mpvec)
 905 {
 906         struct multipath *mpp;
 907         unsigned int i;
 908
 909         vector_foreach_slot (mpvec, mpp, i) {
 910                 if (mpp->retry_tick) {
 911                         mpp->stat_total_queueing_time++;
 912                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
 913                         if(--mpp->retry_tick == 0) {
 914                                 dm_queue_if_no_path(mpp->alias, 0);
 915                                 condlog(2, "%s: Disable queueing", mpp->alias);
 916                         }
 917                 }
 918         }
 919 }
 920
 921 int update_path_groups(struct multipath *mpp, struct vectors *vecs)
 922 {
 923         int i;
 924         struct path * pp;
 925
 926         update_mpp_paths(mpp, vecs->pathvec);
 927         vector_foreach_slot (mpp->paths, pp, i)
 928                 pathinfo(pp, conf->hwtable, DI_PRIO);
 929         setup_map(mpp);
 930         mpp->action = ACT_RELOAD;
 931         if (domap(mpp) <= 0) {
 932                 condlog(0, "%s: failed to update map : %s", mpp->alias,
 933                                 strerror(errno));
 934                 return 1;
 935         }
 936         dm_lib_release();
 937         setup_multipath(vecs, mpp);
 938         sync_map_state(mpp);
 939
 940         return 0;
 941 }
 942
 943 void
 944 check_path (struct vectors * vecs, struct path * pp)
 945 {
 946         int newstate;
 947         int oldpriority;
 948
 949         if (!pp->mpp)
 950                 return;
 951
 952         if (pp->tick && --pp->tick)
 953                 return; /* don't check this path yet */
 954
 955         /*
 956          * provision a next check soonest,
 957          * in case we exit abnormaly from here
 958          */
 959         pp->tick = conf->checkint;
 960
 961         newstate = get_state(pp, 1);
 962
 963         if (newstate == PATH_WILD || newstate == PATH_UNCHECKED) {
 964                 condlog(2, "%s: unusable path", pp->dev);
 965                 pathinfo(pp, conf->hwtable, 0);
 966                 return;
 967         }
 968         /*
 969          * Async IO in flight. Keep the previous path state
 970          * and reschedule as soon as possible
 971          */
 972         if (newstate == PATH_PENDING) {
 973                 pp->tick = 1;
 974                 return;
 975         }
 976         if (newstate != pp->state) {
 977                 int oldstate = pp->state;
 978                 pp->state = newstate;
 979                 LOG_MSG(1, checker_message(&pp->checker));
 980
 981                 /*
 982                  * upon state change, reset the checkint
 983                  * to the shortest delay
 984                  */
 985                 pp->checkint = conf->checkint;
 986
 987                 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
 988                     update_multipath_strings(pp->mpp, vecs->pathvec)) {
 989                         /*
 990                          * proactively fail path in the DM
 991                          */
 992                         if (oldstate == PATH_UP ||
 993                             oldstate == PATH_GHOST)
 994                                 fail_path(pp, 1);
 995                         else
 996                                 fail_path(pp, 0);
 997
 998                         /*
 999                          * cancel scheduled failback
1000                          */
1001                         pp->mpp->failback_tick = 0;
1002
1003                         pp->mpp->stat_path_failures++;
1004                         return;
1005                 }
1006
1007                 /*
1008                  * reinstate this path
1009                  */
1010                 if (oldstate != PATH_UP &&
1011                     oldstate != PATH_GHOST)
1012                         reinstate_path(pp, 1);
1013                 else
1014                         reinstate_path(pp, 0);
1015
1016                 /*
1017                  * schedule [defered] failback
1018                  */
1019                 if (pp->mpp->pgfailback > 0)
1020                         pp->mpp->failback_tick =
1021                                 pp->mpp->pgfailback + 1;
1022                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
1023                     need_switch_pathgroup(pp->mpp, 1))
1024                         switch_pathgroup(pp->mpp);
1025
1026                 /*
1027                  * if at least one path is up in a group, and
1028                  * the group is disabled, re-enable it
1029                  */
1030                 if (newstate == PATH_UP)
1031                         enable_group(pp);
1032         }
1033         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1034                 LOG_MSG(4, checker_message(&pp->checker));
1035                 /*
1036                  * double the next check delay.
1037                  * max at conf->max_checkint
1038                  */
1039                 if (pp->checkint < (conf->max_checkint / 2))
1040                         pp->checkint = 2 * pp->checkint;
1041                 else
1042                         pp->checkint = conf->max_checkint;
1043
1044                 pp->tick = pp->checkint;
1045                 condlog(4, "%s: delay next check %is",
1046                                 pp->dev_t, pp->tick);
1047         }
1048         else if (newstate == PATH_DOWN)
1049                 LOG_MSG(2, checker_message(&pp->checker));
1050
1051         pp->state = newstate;
1052
1053         /*
1054          * path prio refreshing
1055          */
1056         condlog(4, "path prio refresh");
1057         oldpriority = pp->priority;
1058         pathinfo(pp, conf->hwtable, DI_PRIO);
1059
1060         /*
1061          * pathgroup failback policy
1062          */
1063         if (pp->priority != oldpriority &&
1064             pp->mpp->pgpolicyfn == (pgpolicyfn *)group_by_prio)
1065                 update_path_groups(pp->mpp, vecs);
1066         else if (need_switch_pathgroup(pp->mpp, 0)) {
1067                 if (pp->mpp->pgfailback > 0 &&
1068                     pp->mpp->failback_tick <= 0)
1069                         pp->mpp->failback_tick =
1070                                 pp->mpp->pgfailback + 1;
1071                 else if (pp->mpp->pgfailback ==
1072                                 -FAILBACK_IMMEDIATE)
1073                         switch_pathgroup(pp->mpp);
1074         }
1075 }
1076
1077 static void *
1078 checkerloop (void *ap)
1079 {
1080         struct vectors *vecs;
1081         struct path *pp;
1082         int count = 0;
1083         unsigned int i;
1084         sigset_t old;
1085
1086         mlockall(MCL_CURRENT | MCL_FUTURE);
1087         vecs = (struct vectors *)ap;
1088         condlog(2, "path checkers start up");
1089
1090         /*
1091          * init the path check interval
1092          */
1093         vector_foreach_slot (vecs->pathvec, pp, i) {
1094                 pp->checkint = conf->checkint;
1095         }
1096
1097         while (1) {
1098                 block_signal(SIGHUP, &old);
1099                 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1100                 lock(vecs->lock);
1101                 condlog(4, "tick");
1102
1103                 if (vecs->pathvec) {
1104                         vector_foreach_slot (vecs->pathvec, pp, i) {
1105                                 check_path(vecs, pp);
1106                         }
1107                 }
1108                 if (vecs->mpvec) {
1109                         defered_failback_tick(vecs->mpvec);
1110                         retry_count_tick(vecs->mpvec);
1111                 }
1112                 if (count)
1113                         count--;
1114                 else {
1115                         condlog(4, "map garbage collection");
1116                         mpvec_garbage_collector(vecs);
1117                         count = MAPGCINT;
1118                 }
1119
1120                 lock_cleanup_pop(vecs->lock);
1121                 pthread_sigmask(SIG_SETMASK, &old, NULL);
1122                 sleep(1);
1123         }
1124         return NULL;
1125 }
1126
1127 int
1128 configure (struct vectors * vecs, int start_waiters)
1129 {
1130         struct multipath * mpp;
1131         struct path * pp;
1132         vector mpvec;
1133         int i;
1134
1135         if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1136                 return 1;
1137
1138         if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1139                 return 1;
1140
1141         if (!(mpvec = vector_alloc()))
1142                 return 1;
1143
1144         /*
1145          * probe for current path (from sysfs) and map (from dm) sets
1146          */
1147         path_discovery(vecs->pathvec, conf, DI_ALL);
1148
1149         vector_foreach_slot (vecs->pathvec, pp, i){
1150                 if (filter_path(conf, pp) > 0){
1151                         vector_del_slot(vecs->pathvec, i);
1152                         free_path(pp);
1153                         i--;
1154                 }
1155                 else
1156                         pp->checkint = conf->checkint;
1157         }
1158         if (map_discovery(vecs))
1159                 return 1;
1160
1161         /*
1162          * create new set of maps & push changed ones into dm
1163          */
1164         if (coalesce_paths(vecs, mpvec, NULL, 0))
1165                 return 1;
1166
1167         /*
1168          * may need to remove some maps which are no longer relevant
1169          * e.g., due to blacklist changes in conf file
1170          */
1171         if (coalesce_maps(vecs, mpvec))
1172                 return 1;
1173
1174         dm_lib_release();
1175
1176         sync_maps_state(mpvec);
1177
1178         /*
1179          * purge dm of old maps
1180          */
1181         remove_maps(vecs);
1182
1183         /*
1184          * save new set of maps formed by considering current path state
1185          */
1186         vector_free(vecs->mpvec);
1187         vecs->mpvec = mpvec;
1188
1189         /*
1190          * start dm event waiter threads for these new maps
1191          */
1192         vector_foreach_slot(vecs->mpvec, mpp, i) {
1193                 if (setup_multipath(vecs, mpp))
1194                         return 1;
1195                 if (start_waiters)
1196                         if (start_waiter_thread(mpp, vecs))
1197                                 return 1;
1198         }
1199         return 0;
1200 }
1201
1202 int
1203 reconfigure (struct vectors * vecs)
1204 {
1205         struct config * old = conf;
1206
1207         /*
1208          * free old map and path vectors ... they use old conf state
1209          */
1210         if (VECTOR_SIZE(vecs->mpvec))
1211                 remove_maps_and_stop_waiters(vecs);
1212
1213         if (VECTOR_SIZE(vecs->pathvec))
1214                 free_pathvec(vecs->pathvec, FREE_PATHS);
1215
1216         vecs->pathvec = NULL;
1217         conf = NULL;
1218
1219         if (load_config(DEFAULT_CONFIGFILE))
1220                 return 1;
1221
1222         conf->verbosity = old->verbosity;
1223
1224         if (!conf->checkint) {
1225                 conf->checkint = DEFAULT_CHECKINT;
1226                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1227         }
1228         conf->daemon = 1;
1229         configure(vecs, 1);
1230         free_config(old);
1231         return 0;
1232 }
1233
1234 static struct vectors *
1235 init_vecs (void)
1236 {
1237         struct vectors * vecs;
1238
1239         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1240
1241         if (!vecs)
1242                 return NULL;
1243
1244         vecs->lock.mutex =
1245                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1246
1247         if (!vecs->lock.mutex)
1248                 goto out;
1249
1250         pthread_mutex_init(vecs->lock.mutex, NULL);
1251         vecs->lock.depth = 0;
1252
1253         return vecs;
1254
1255 out:
1256         FREE(vecs);
1257         condlog(0, "failed to init paths");
1258         return NULL;
1259 }
1260
1261 static void *
1262 signal_set(int signo, void (*func) (int))
1263 {
1264         int r;
1265         struct sigaction sig;
1266         struct sigaction osig;
1267
1268         sig.sa_handler = func;
1269         sigemptyset(&sig.sa_mask);
1270         sig.sa_flags = 0;
1271
1272         r = sigaction(signo, &sig, &osig);
1273
1274         if (r < 0)
1275                 return (SIG_ERR);
1276         else
1277                 return (osig.sa_handler);
1278 }
1279
1280 static void
1281 sighup (int sig)
1282 {
1283         condlog(2, "reconfigure (SIGHUP)");
1284
1285         lock(gvecs->lock);
1286         reconfigure(gvecs);
1287         unlock(gvecs->lock);
1288
1289 #ifdef _DEBUG_
1290         dbg_free_final(NULL);
1291 #endif
1292 }
1293
1294 static void
1295 sigend (int sig)
1296 {
1297         exit_daemon(0);
1298 }
1299
1300 static void
1301 sigusr1 (int sig)
1302 {
1303         condlog(3, "SIGUSR1 received");
1304 }
1305
1306 static void
1307 signal_init(void)
1308 {
1309         signal_set(SIGHUP, sighup);
1310         signal_set(SIGUSR1, sigusr1);
1311         signal_set(SIGINT, sigend);
1312         signal_set(SIGTERM, sigend);
1313         signal(SIGPIPE, SIG_IGN);
1314 }
1315
1316 static void
1317 setscheduler (void)
1318 {
1319         int res;
1320         static struct sched_param sched_param = {
1321                 .sched_priority = 99
1322         };
1323
1324         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1325
1326         if (res == -1)
1327                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1328         return;
1329 }
1330
1331 static void
1332 set_oom_adj (int val)
1333 {
1334         FILE *fp;
1335
1336         fp = fopen("/proc/self/oom_adj", "w");
1337
1338         if (!fp)
1339                 return;
1340
1341         fprintf(fp, "%i", val);
1342         fclose(fp);
1343 }
1344
1345 void
1346 setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
1347 {
1348         if (pthread_attr_init(attr)) {
1349                 fprintf(stderr, "can't initialize thread attr: %s\n",
1350                         strerror(errno));
1351                 exit(1);
1352         }
1353         if (stacksize < PTHREAD_STACK_MIN)
1354                 stacksize = PTHREAD_STACK_MIN;
1355
1356         if (pthread_attr_setstacksize(attr, stacksize)) {
1357                 fprintf(stderr, "can't set thread stack size to %lu: %s\n",
1358                         (unsigned long)stacksize, strerror(errno));
1359                 exit(1);
1360         }
1361         if (detached && pthread_attr_setdetachstate(attr,
1362                                                     PTHREAD_CREATE_DETACHED)) {
1363                 fprintf(stderr, "can't set thread to detached: %s\n",
1364                         strerror(errno));
1365                 exit(1);
1366         }
1367 }
1368
1369 static int
1370 child (void * param)
1371 {
1372         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1373         pthread_attr_t log_attr, misc_attr;
1374         struct vectors * vecs;
1375         struct multipath * mpp;
1376         int i;
1377
1378         mlockall(MCL_CURRENT | MCL_FUTURE);
1379
1380         setup_thread_attr(&misc_attr, 64 * 1024, 1);
1381         setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1382
1383         if (logsink) {
1384                 setup_thread_attr(&log_attr, 64 * 1024, 0);
1385                 log_thread_start(&log_attr);
1386                 pthread_attr_destroy(&log_attr);
1387         }
1388
1389         condlog(2, "--------start up--------");
1390         condlog(2, "read " DEFAULT_CONFIGFILE);
1391
1392         if (load_config(DEFAULT_CONFIGFILE))
1393                 exit(1);
1394
1395         if (init_checkers()) {
1396                 condlog(0, "failed to initialize checkers");
1397                 exit(1);
1398         }
1399         if (init_prio()) {
1400                 condlog(0, "failed to initialize prioritizers");
1401                 exit(1);
1402         }
1403
1404         setlogmask(LOG_UPTO(conf->verbosity + 3));
1405
1406         /*
1407          * fill the voids left in the config file
1408          */
1409         if (!conf->checkint) {
1410                 conf->checkint = DEFAULT_CHECKINT;
1411                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1412         }
1413
1414         if (conf->max_fds) {
1415                 struct rlimit fd_limit;
1416
1417                 fd_limit.rlim_cur = conf->max_fds;
1418                 fd_limit.rlim_max = conf->max_fds;
1419                 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1420                         condlog(0, "can't set open fds limit to %d : %s\n",
1421                                 conf->max_fds, strerror(errno));
1422         }
1423
1424         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1425                 if (logsink)
1426                         log_thread_stop();
1427
1428                 exit(1);
1429         }
1430         signal_init();
1431         setscheduler();
1432         set_oom_adj(-16);
1433         vecs = gvecs = init_vecs();
1434
1435         if (!vecs)
1436                 exit(1);
1437
1438         if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1439                 condlog(0, "can not find sysfs mount point");
1440                 exit(1);
1441         }
1442         conf->daemon = 1;
1443         dm_udev_set_sync_support(0);
1444         /*
1445          * fetch and configure both paths and multipaths
1446          */
1447         if (configure(vecs, 1)) {
1448                 condlog(0, "failure during configuration");
1449                 exit(1);
1450         }
1451         /*
1452          * start threads
1453          */
1454         pthread_create(&check_thr, &misc_attr, checkerloop, vecs);
1455         pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs);
1456         pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs);
1457         pthread_attr_destroy(&misc_attr);
1458
1459         pthread_mutex_lock(&exit_mutex);
1460         pthread_cond_wait(&exit_cond, &exit_mutex);
1461
1462         /*
1463          * exit path
1464          */
1465         block_signal(SIGHUP, NULL);
1466         lock(vecs->lock);
1467         if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF)
1468                 vector_foreach_slot(vecs->mpvec, mpp, i)
1469                         dm_queue_if_no_path(mpp->alias, 0);
1470         remove_maps_and_stop_waiters(vecs);
1471         free_pathvec(vecs->pathvec, FREE_PATHS);
1472
1473         pthread_cancel(check_thr);
1474         pthread_cancel(uevent_thr);
1475         pthread_cancel(uxlsnr_thr);
1476
1477         sysfs_cleanup();
1478
1479         free_keys(keys);
1480         keys = NULL;
1481         free_handlers(handlers);
1482         handlers = NULL;
1483         free_polls();
1484
1485         unlock(vecs->lock);
1486         /* Now all the waitevent threads will start rushing in. */
1487         while (vecs->lock.depth > 0) {
1488                 sleep (1); /* This is weak. */
1489                 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1490         }
1491         pthread_mutex_destroy(vecs->lock.mutex);
1492         FREE(vecs->lock.mutex);
1493         vecs->lock.depth = 0;
1494         vecs->lock.mutex = NULL;
1495         FREE(vecs);
1496         vecs = NULL;
1497
1498         condlog(2, "--------shut down-------");
1499
1500         if (logsink)
1501                 log_thread_stop();
1502
1503         dm_lib_release();
1504         dm_lib_exit();
1505
1506         cleanup_prio();
1507         cleanup_checkers();
1508         /*
1509          * Freeing config must be done after condlog() and dm_lib_exit(),
1510          * because logging functions like dlog() and dm_write_log()
1511          * reference the config.
1512          */
1513         free_config(conf);
1514         conf = NULL;
1515
1516 #ifdef _DEBUG_
1517         dbg_free_final(NULL);
1518 #endif
1519
1520         exit(0);
1521 }
1522
1523 static int
1524 daemonize(void)
1525 {
1526         int pid;
1527         int in_fd, out_fd;
1528
1529         if( (pid = fork()) < 0){
1530                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1531                 return -1;
1532         }
1533         else if (pid != 0)
1534                 return pid;
1535
1536         setsid();
1537
1538         if ( (pid = fork()) < 0)
1539                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1540         else if (pid != 0)
1541                 _exit(0);
1542
1543         in_fd = open("/dev/null", O_RDONLY);
1544         if (in_fd < 0){
1545                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1546                         strerror(errno));
1547                 _exit(0);
1548         }
1549         out_fd = open("/dev/console", O_WRONLY);
1550         if (out_fd < 0){
1551                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1552                         strerror(errno));
1553                 _exit(0);
1554         }
1555
1556         close(STDIN_FILENO);
1557         dup(in_fd);
1558         close(STDOUT_FILENO);
1559         dup(out_fd);
1560         close(STDERR_FILENO);
1561         dup(out_fd);
1562
1563         close(in_fd);
1564         close(out_fd);
1565         if (chdir("/") < 0)
1566                 fprintf(stderr, "cannot chdir to '/', continuing\n");
1567
1568         return 0;
1569 }
1570
1571 int
1572 main (int argc, char *argv[])
1573 {
1574         extern char *optarg;
1575         extern int optind;
1576         int arg;
1577         int err;
1578
1579         logsink = 1;
1580         dm_init();
1581
1582         if (getuid() != 0) {
1583                 fprintf(stderr, "need to be root\n");
1584                 exit(1);
1585         }
1586
1587         /* make sure we don't lock any path */
1588         chdir("/");
1589         umask(umask(077) | 022);
1590
1591         conf = alloc_config();
1592
1593         if (!conf)
1594                 exit(1);
1595
1596         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1597         switch(arg) {
1598                 case 'd':
1599                         logsink = 0;
1600                         //debug=1; /* ### comment me out ### */
1601                         break;
1602                 case 'v':
1603                         if (sizeof(optarg) > sizeof(char *) ||
1604                             !isdigit(optarg[0]))
1605                                 exit(1);
1606
1607                         conf->verbosity = atoi(optarg);
1608                         break;
1609                 case 'k':
1610                         uxclnt(optarg);
1611                         exit(0);
1612                 default:
1613                         ;
1614                 }
1615         }
1616         if (optind < argc) {
1617                 char cmd[CMDSIZE];
1618                 char * s = cmd;
1619                 char * c = s;
1620
1621                 while (optind < argc) {
1622                         if (strchr(argv[optind], ' '))
1623                                 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1624                         else
1625                                 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1626                         optind++;
1627                 }
1628                 c += snprintf(c, s + CMDSIZE - c, "\n");
1629                 uxclnt(s);
1630                 exit(0);
1631         }
1632
1633         if (!logsink)
1634                 err = 0;
1635         else
1636                 err = daemonize();
1637
1638         if (err < 0)
1639                 /* error */
1640                 exit(1);
1641         else if (err > 0)
1642                 /* parent dies */
1643                 exit(0);
1644         else
1645                 /* child lives */
1646                 return (child(NULL));
1647 }
1648