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
9 #include <libdevmapper.h>
12 #include <sys/types.h>
16 #include <sys/resource.h>
35 #include <blacklist.h>
36 #include <structs_vec.h>
38 #include <devmapper.h>
41 #include <discovery.h>
45 #include <switchgroup.h>
47 #include <configure.h>
55 #include "cli_handlers.h"
59 #define FILE_NAME_SIZE 256
62 #define LOG_MSG(a,b) \
63 if (strlen(b)) condlog(a, "%s: %s", pp->dev, b);
65 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
66 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
71 * global copy of vecs for use in sig handlers
73 struct vectors * gvecs;
76 need_switch_pathgroup (struct multipath * mpp, int refresh)
78 struct pathgroup * pgp;
82 if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
86 * Refresh path priority values
89 vector_foreach_slot (mpp->pg, pgp, i)
90 vector_foreach_slot (pgp->paths, pp, j)
91 pathinfo(pp, conf->hwtable, DI_PRIO);
93 mpp->bestpg = select_path_group(mpp);
95 if (mpp->bestpg != mpp->nextpg)
102 switch_pathgroup (struct multipath * mpp)
104 mpp->stat_switchgroup++;
105 dm_switchgroup(mpp->alias, mpp->bestpg);
106 condlog(2, "%s: switch to path group #%i",
107 mpp->alias, mpp->bestpg);
111 coalesce_maps(struct vectors *vecs, vector nmpv)
113 struct multipath * ompp;
114 vector ompv = vecs->mpvec;
118 vector_foreach_slot (ompv, ompp, i) {
119 if (!find_mp_by_wwid(nmpv, ompp->wwid)) {
121 * remove all current maps not allowed by the
122 * current configuration
124 if (dm_flush_map(ompp->alias)) {
125 condlog(0, "%s: unable to flush devmap",
128 * may be just because the device is open
130 if (!vector_alloc_slot(nmpv))
133 vector_set_slot(nmpv, ompp);
134 setup_multipath(vecs, ompp);
136 if ((j = find_slot(ompv, (void *)ompp)) != -1)
137 vector_del_slot(ompv, j);
143 condlog(2, "%s devmap removed", ompp->alias);
151 sync_map_state(struct multipath *mpp)
153 struct pathgroup *pgp;
160 vector_foreach_slot (mpp->pg, pgp, i){
161 vector_foreach_slot (pgp->paths, pp, j){
162 if (pp->state == PATH_UNCHECKED ||
163 pp->state == PATH_WILD)
165 if ((pp->dmstate == PSTATE_FAILED ||
166 pp->dmstate == PSTATE_UNDEF) &&
167 (pp->state == PATH_UP || pp->state == PATH_GHOST))
168 dm_reinstate_path(mpp->alias, pp->dev_t);
169 else if ((pp->dmstate == PSTATE_ACTIVE ||
170 pp->dmstate == PSTATE_UNDEF) &&
171 (pp->state == PATH_DOWN ||
172 pp->state == PATH_SHAKY))
173 dm_fail_path(mpp->alias, pp->dev_t);
179 sync_maps_state(vector mpvec)
182 struct multipath *mpp;
184 vector_foreach_slot (mpvec, mpp, i)
189 flush_map(struct multipath * mpp, struct vectors * vecs)
192 * clear references to this map before flushing so we can ignore
193 * the spurious uevent we may generate with the dm_flush_map call below
195 if (dm_flush_map(mpp->alias)) {
197 * May not really be an error -- if the map was already flushed
198 * from the device mapper by dmsetup(8) for instance.
200 condlog(0, "%s: can't flush", mpp->alias);
205 condlog(2, "%s: devmap removed", mpp->alias);
208 orphan_paths(vecs->pathvec, mpp);
209 remove_map_and_stop_waiter(mpp, vecs, 1);
215 uev_add_map (struct sysfs_device * dev, struct vectors * vecs)
217 condlog(2, "%s: add map (uevent)", dev->kernel);
218 return ev_add_map(dev, vecs);
222 ev_add_map (struct sysfs_device * dev, struct vectors * vecs)
228 struct multipath * mpp;
232 dev_t = sysfs_attr_get_value(dev->devpath, "dev");
234 if (!dev_t || sscanf(dev_t, "%d:%d", &major, &minor) != 2)
237 alias = dm_mapname(major, minor);
242 map_present = dm_map_present(alias);
244 if (map_present && dm_type(alias, TGT_MPATH) <= 0) {
245 condlog(4, "%s: not a multipath map", alias);
250 mpp = find_mp_by_alias(vecs->mpvec, alias);
254 * Not really an error -- we generate our own uevent
255 * if we create a multipath mapped device as a result
258 condlog(0, "%s: devmap already registered",
265 * now we can register the map
267 if (map_present && (mpp = add_map_without_path(vecs, minor, alias))) {
269 condlog(2, "%s: devmap %s added", alias, dev->kernel);
272 refwwid = get_refwwid(dev->kernel, DEV_DEVMAP, vecs->pathvec);
275 r = coalesce_paths(vecs, NULL, refwwid, 0);
280 condlog(2, "%s: devmap %s added", alias, dev->kernel);
282 condlog(0, "%s: uev_add_map %s failed", alias, dev->kernel);
290 uev_remove_map (struct sysfs_device * dev, struct vectors * vecs)
292 condlog(2, "%s: remove map (uevent)", dev->kernel);
293 return ev_remove_map(dev->kernel, vecs);
297 ev_remove_map (char * devname, struct vectors * vecs)
299 struct multipath * mpp;
301 mpp = find_mp_by_str(vecs->mpvec, devname);
304 condlog(2, "%s: devmap not registered, can't remove",
308 flush_map(mpp, vecs);
314 uev_umount_map (struct sysfs_device * dev, struct vectors * vecs)
316 struct multipath * mpp;
318 condlog(2, "%s: umount map (uevent)", dev->kernel);
320 mpp = find_mp_by_str(vecs->mpvec, dev->kernel);
325 update_mpp_paths(mpp, vecs->pathvec);
326 verify_paths(mpp, vecs, NULL);
328 if (!VECTOR_SIZE(mpp->paths))
329 flush_map(mpp, vecs);
335 uev_add_path (struct sysfs_device * dev, struct vectors * vecs)
337 condlog(2, "%s: add path (uevent)", dev->kernel);
338 return (ev_add_path(dev->kernel, vecs) != 1)? 0 : 1;
349 ev_add_path (char * devname, struct vectors * vecs)
351 struct multipath * mpp;
353 char empty_buff[WWID_SIZE] = {0};
355 pp = find_path_by_dev(vecs->pathvec, devname);
358 condlog(0, "%s: spurious uevent, path already in pathvec",
365 * get path vital state
367 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
369 condlog(0, "%s: failed to store path info", devname);
372 pp->checkint = conf->checkint;
376 * need path UID to go any further
378 if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
379 condlog(0, "%s: failed to get path uid", devname);
380 return 1; /* leave path added to pathvec */
382 if (filter_path(conf, pp) > 0){
383 int i = find_slot(vecs->pathvec, (void *)pp);
385 vector_del_slot(vecs->pathvec, i);
389 mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
392 if (adopt_paths(vecs->pathvec, mpp))
393 return 1; /* leave path added to pathvec */
395 verify_paths(mpp, vecs, NULL);
396 mpp->action = ACT_RELOAD;
399 if ((mpp = add_map_with_path(vecs, pp, 1)))
400 mpp->action = ACT_CREATE;
402 return 1; /* leave path added to pathvec */
406 * push the map to the device-mapper
408 if (setup_map(mpp)) {
409 condlog(0, "%s: failed to setup map for addition of new "
410 "path %s", mpp->alias, devname);
414 * reload the map for the multipath mapped device
416 if (domap(mpp) <= 0) {
417 condlog(0, "%s: failed in domap for addition of new "
418 "path %s", mpp->alias, devname);
420 * deal with asynchronous uevents :((
422 if (mpp->action == ACT_RELOAD) {
423 condlog(0, "%s: uev_add_path sleep", mpp->alias);
425 update_mpp_paths(mpp, vecs->pathvec);
434 * update our state from kernel regardless of create or reload
436 if (setup_multipath(vecs, mpp))
441 if (mpp->action == ACT_CREATE &&
442 start_waiter_thread(mpp, vecs))
445 condlog(2, "%s path added to devmap %s", devname, mpp->alias);
449 remove_map(mpp, vecs, 1);
454 uev_remove_path (struct sysfs_device * dev, struct vectors * vecs)
458 condlog(2, "%s: remove path (uevent)", dev->kernel);
459 retval = ev_remove_path(dev->kernel, vecs);
461 sysfs_device_put(dev);
467 ev_remove_path (char * devname, struct vectors * vecs)
469 struct multipath * mpp;
473 pp = find_path_by_dev(vecs->pathvec, devname);
476 condlog(0, "%s: spurious uevent, path not in pathvec", devname);
481 * avoid referring to the map of an orphaned path
483 if ((mpp = pp->mpp)) {
485 * transform the mp->pg vector of vectors of paths
486 * into a mp->params string to feed the device-mapper
488 if (update_mpp_paths(mpp, vecs->pathvec)) {
489 condlog(0, "%s: failed to update paths",
493 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
494 vector_del_slot(mpp->paths, i);
497 * remove the map IFF removing the last path
499 if (VECTOR_SIZE(mpp->paths) == 0) {
500 char alias[WWID_SIZE];
503 * flush_map will fail if the device is open
505 strncpy(alias, mpp->alias, WWID_SIZE);
506 if (!flush_map(mpp, vecs)) {
507 condlog(2, "%s: removed map after"
508 " removing all paths",
514 * Not an error, continue
518 if (setup_map(mpp)) {
519 condlog(0, "%s: failed to setup map for"
520 " removal of path %s", mpp->alias,
527 mpp->action = ACT_RELOAD;
528 if (domap(mpp) <= 0) {
529 condlog(0, "%s: failed in domap for "
530 "removal of path %s",
531 mpp->alias, devname);
535 * update our state from kernel
537 if (setup_multipath(vecs, mpp)) {
542 condlog(2, "%s: path removed from map %s",
543 devname, mpp->alias);
547 if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
548 vector_del_slot(vecs->pathvec, i);
555 remove_map_and_stop_waiter(mpp, vecs, 1);
560 map_discovery (struct vectors * vecs)
562 struct multipath * mpp;
565 if (dm_get_maps(vecs->mpvec))
568 vector_foreach_slot (vecs->mpvec, mpp, i)
569 if (setup_multipath(vecs, mpp))
576 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
578 struct vectors * vecs;
583 vecs = (struct vectors *)trigger_data;
585 pthread_cleanup_push(cleanup_lock, vecs->lock);
588 r = parse_cmd(str, reply, len, vecs);
591 *reply = STRDUP("fail\n");
592 *len = strlen(*reply) + 1;
595 else if (!r && *len == 0) {
596 *reply = STRDUP("ok\n");
597 *len = strlen(*reply) + 1;
600 /* else if (r < 0) leave *reply alone */
602 lock_cleanup_pop(vecs->lock);
607 uev_discard(char * devpath)
613 * keep only block devices, discard partitions
615 tmp = strstr(devpath, "/block/");
617 condlog(0, "no /block/ in '%s'", devpath);
620 if (sscanf(tmp, "/block/%10s", a) != 1 ||
621 sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
622 condlog(0, "discard event on %s", devpath);
629 uev_trigger (struct uevent * uev, void * trigger_data)
632 struct sysfs_device *sysdev;
633 struct vectors * vecs;
635 vecs = (struct vectors *)trigger_data;
637 if (uev_discard(uev->devpath))
640 sysdev = sysfs_device_get(uev->devpath);
648 * Add events are ignored here as the tables
649 * are not fully initialised then.
651 if (!strncmp(sysdev->kernel, "dm-", 3)) {
652 if (!strncmp(uev->action, "change", 6)) {
653 r = uev_add_map(sysdev, vecs);
656 if (!strncmp(uev->action, "remove", 6)) {
657 r = uev_remove_map(sysdev, vecs);
660 if (!strncmp(uev->action, "umount", 6)) {
661 r = uev_umount_map(sysdev, vecs);
668 * path add/remove event
670 if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
674 if (!strncmp(uev->action, "add", 3)) {
675 r = uev_add_path(sysdev, vecs);
678 if (!strncmp(uev->action, "remove", 6)) {
679 r = uev_remove_path(sysdev, vecs);
689 ueventloop (void * ap)
691 if (uevent_listen(&uev_trigger, ap))
692 fprintf(stderr, "error starting uevent listener");
698 uxlsnrloop (void * ap)
703 set_handler_callback(LIST+PATHS, cli_list_paths);
704 set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
705 set_handler_callback(LIST+MAPS, cli_list_maps);
706 set_handler_callback(LIST+STATUS, cli_list_status);
707 set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
708 set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
709 set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
710 set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
711 set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
712 set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
713 set_handler_callback(LIST+CONFIG, cli_list_config);
714 set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
715 set_handler_callback(LIST+DEVICES, cli_list_devices);
716 set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
717 set_handler_callback(ADD+PATH, cli_add_path);
718 set_handler_callback(DEL+PATH, cli_del_path);
719 set_handler_callback(ADD+MAP, cli_add_map);
720 set_handler_callback(DEL+MAP, cli_del_map);
721 set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
722 set_handler_callback(RECONFIGURE, cli_reconfigure);
723 set_handler_callback(SUSPEND+MAP, cli_suspend);
724 set_handler_callback(RESUME+MAP, cli_resume);
725 set_handler_callback(REINSTATE+PATH, cli_reinstate);
726 set_handler_callback(FAIL+PATH, cli_fail);
727 set_handler_callback(QUIT, cli_quit);
729 uxsock_listen(&uxsock_trigger, ap);
735 exit_daemon (int status)
738 fprintf(stderr, "bad exit status. see daemon.log\n");
740 condlog(3, "unlink pidfile");
741 unlink(DEFAULT_PIDFILE);
744 pthread_cond_signal(&exit_cond);
751 fail_path (struct path * pp, int del_active)
756 condlog(2, "checker failed path %s in map %s",
757 pp->dev_t, pp->mpp->alias);
759 dm_fail_path(pp->mpp->alias, pp->dev_t);
761 update_queue_mode_del_path(pp->mpp);
765 * caller must have locked the path list before calling that function
768 reinstate_path (struct path * pp, int add_active)
773 if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
774 condlog(0, "%s: reinstate failed", pp->dev_t);
776 condlog(2, "%s: reinstated", pp->dev_t);
778 update_queue_mode_add_path(pp->mpp);
783 enable_group(struct path * pp)
785 struct pathgroup * pgp;
788 * if path is added through uev_add_path, pgindex can be unset.
789 * next update_strings() will set it, upon map reload event.
791 * we can safely return here, because upon map reload, all
792 * PG will be enabled.
794 if (!pp->mpp->pg || !pp->pgindex)
797 pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
799 if (pgp->status == PGSTATE_DISABLED) {
800 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
801 dm_enablegroup(pp->mpp->alias, pp->pgindex);
806 mpvec_garbage_collector (struct vectors * vecs)
808 struct multipath * mpp;
811 vector_foreach_slot (vecs->mpvec, mpp, i) {
812 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
813 condlog(2, "%s: remove dead map", mpp->alias);
814 remove_map_and_stop_waiter(mpp, vecs, 1);
821 defered_failback_tick (vector mpvec)
823 struct multipath * mpp;
826 vector_foreach_slot (mpvec, mpp, i) {
828 * defered failback getting sooner
830 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
831 mpp->failback_tick--;
833 if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
834 switch_pathgroup(mpp);
840 retry_count_tick(vector mpvec)
842 struct multipath *mpp;
845 vector_foreach_slot (mpvec, mpp, i) {
846 if (mpp->retry_tick) {
847 mpp->stat_total_queueing_time++;
848 condlog(4, "%s: Retrying.. No active path", mpp->alias);
849 if(--mpp->retry_tick == 0) {
850 dm_queue_if_no_path(mpp->alias, 0);
851 condlog(2, "%s: Disable queueing", mpp->alias);
858 check_path (struct vectors * vecs, struct path * pp)
865 if (pp->tick && --pp->tick)
866 return; /* don't check this path yet */
869 * provision a next check soonest,
870 * in case we exit abnormaly from here
872 pp->tick = conf->checkint;
874 if (!checker_selected(&pp->checker)) {
875 pathinfo(pp, conf->hwtable, DI_SYSFS);
878 if (!checker_selected(&pp->checker)) {
879 condlog(0, "%s: checker is not set", pp->dev);
883 * Set checker in async mode.
884 * Honored only by checker implementing the said mode.
886 checker_set_async(&pp->checker);
888 if (path_offline(pp))
889 newstate = PATH_DOWN;
891 newstate = checker_check(&pp->checker);
894 condlog(2, "%s: unusable path", pp->dev);
895 pathinfo(pp, conf->hwtable, 0);
899 * Async IO in flight. Keep the previous path state
900 * and reschedule as soon as possible
902 if (newstate == PATH_PENDING) {
906 if (newstate != pp->state) {
907 int oldstate = pp->state;
908 pp->state = newstate;
909 LOG_MSG(1, checker_message(&pp->checker));
912 * upon state change, reset the checkint
913 * to the shortest delay
915 pp->checkint = conf->checkint;
917 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
918 update_multipath_strings(pp->mpp, vecs->pathvec)) {
920 * proactively fail path in the DM
922 if (oldstate == PATH_UP ||
923 oldstate == PATH_GHOST)
929 * cancel scheduled failback
931 pp->mpp->failback_tick = 0;
933 pp->mpp->stat_path_failures++;
938 * reinstate this path
940 if (oldstate != PATH_UP &&
941 oldstate != PATH_GHOST)
942 reinstate_path(pp, 1);
944 reinstate_path(pp, 0);
947 * schedule [defered] failback
949 if (pp->mpp->pgfailback > 0)
950 pp->mpp->failback_tick =
951 pp->mpp->pgfailback + 1;
952 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
953 need_switch_pathgroup(pp->mpp, 1))
954 switch_pathgroup(pp->mpp);
957 * if at least one path is up in a group, and
958 * the group is disabled, re-enable it
960 if (newstate == PATH_UP)
963 else if (newstate == PATH_UP || newstate == PATH_GHOST) {
964 LOG_MSG(4, checker_message(&pp->checker));
966 * double the next check delay.
967 * max at conf->max_checkint
969 if (pp->checkint < (conf->max_checkint / 2))
970 pp->checkint = 2 * pp->checkint;
972 pp->checkint = conf->max_checkint;
974 pp->tick = pp->checkint;
975 condlog(4, "%s: delay next check %is",
976 pp->dev_t, pp->tick);
978 else if (newstate == PATH_DOWN)
979 LOG_MSG(2, checker_message(&pp->checker));
981 pp->state = newstate;
984 * path prio refreshing
986 condlog(4, "path prio refresh");
987 pathinfo(pp, conf->hwtable, DI_PRIO);
990 * pathgroup failback policy
992 if (need_switch_pathgroup(pp->mpp, 0)) {
993 if (pp->mpp->pgfailback > 0 &&
994 pp->mpp->failback_tick <= 0)
995 pp->mpp->failback_tick =
996 pp->mpp->pgfailback + 1;
997 else if (pp->mpp->pgfailback ==
999 switch_pathgroup(pp->mpp);
1004 checkerloop (void *ap)
1006 struct vectors *vecs;
1011 mlockall(MCL_CURRENT | MCL_FUTURE);
1012 vecs = (struct vectors *)ap;
1013 condlog(2, "path checkers start up");
1016 * init the path check interval
1018 vector_foreach_slot (vecs->pathvec, pp, i) {
1019 pp->checkint = conf->checkint;
1023 pthread_cleanup_push(cleanup_lock, vecs->lock);
1027 if (vecs->pathvec) {
1028 vector_foreach_slot (vecs->pathvec, pp, i) {
1029 check_path(vecs, pp);
1033 defered_failback_tick(vecs->mpvec);
1034 retry_count_tick(vecs->mpvec);
1039 condlog(4, "map garbage collection");
1040 mpvec_garbage_collector(vecs);
1044 lock_cleanup_pop(vecs->lock);
1051 configure (struct vectors * vecs, int start_waiters)
1053 struct multipath * mpp;
1058 if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1061 if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1064 if (!(mpvec = vector_alloc()))
1068 * probe for current path (from sysfs) and map (from dm) sets
1070 path_discovery(vecs->pathvec, conf, DI_ALL);
1072 vector_foreach_slot (vecs->pathvec, pp, i){
1073 if (filter_path(conf, pp) > 0){
1074 vector_del_slot(vecs->pathvec, i);
1079 pp->checkint = conf->checkint;
1081 if (map_discovery(vecs))
1085 * create new set of maps & push changed ones into dm
1087 if (coalesce_paths(vecs, mpvec, NULL, 0))
1091 * may need to remove some maps which are no longer relevant
1092 * e.g., due to blacklist changes in conf file
1094 if (coalesce_maps(vecs, mpvec))
1099 sync_maps_state(mpvec);
1102 * purge dm of old maps
1107 * save new set of maps formed by considering current path state
1109 vector_free(vecs->mpvec);
1110 vecs->mpvec = mpvec;
1113 * start dm event waiter threads for these new maps
1115 vector_foreach_slot(vecs->mpvec, mpp, i) {
1116 if (setup_multipath(vecs, mpp))
1119 if (start_waiter_thread(mpp, vecs))
1126 reconfigure (struct vectors * vecs)
1128 struct config * old = conf;
1131 * free old map and path vectors ... they use old conf state
1133 if (VECTOR_SIZE(vecs->mpvec))
1134 remove_maps_and_stop_waiters(vecs);
1136 if (VECTOR_SIZE(vecs->pathvec))
1137 free_pathvec(vecs->pathvec, FREE_PATHS);
1139 vecs->pathvec = NULL;
1142 if (load_config(DEFAULT_CONFIGFILE))
1145 conf->verbosity = old->verbosity;
1147 if (!conf->checkint) {
1148 conf->checkint = DEFAULT_CHECKINT;
1149 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1156 static struct vectors *
1159 struct vectors * vecs;
1161 vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1167 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1172 pthread_mutex_init(vecs->lock, NULL);
1178 condlog(0, "failed to init paths");
1183 signal_set(int signo, void (*func) (int))
1186 struct sigaction sig;
1187 struct sigaction osig;
1189 sig.sa_handler = func;
1190 sigemptyset(&sig.sa_mask);
1193 r = sigaction(signo, &sig, &osig);
1198 return (osig.sa_handler);
1204 condlog(2, "reconfigure (SIGHUP)");
1208 unlock(gvecs->lock);
1211 dbg_free_final(NULL);
1224 condlog(3, "SIGUSR1 received");
1230 signal_set(SIGHUP, sighup);
1231 signal_set(SIGUSR1, sigusr1);
1232 signal_set(SIGINT, sigend);
1233 signal_set(SIGTERM, sigend);
1234 signal(SIGPIPE, SIG_IGN);
1241 static struct sched_param sched_param = {
1242 .sched_priority = 99
1245 res = sched_setscheduler (0, SCHED_RR, &sched_param);
1248 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1253 set_oom_adj (int val)
1257 fp = fopen("/proc/self/oom_adj", "w");
1262 fprintf(fp, "%i", val);
1267 child (void * param)
1269 pthread_t check_thr, uevent_thr, uxlsnr_thr;
1270 pthread_attr_t attr;
1271 struct vectors * vecs;
1273 mlockall(MCL_CURRENT | MCL_FUTURE);
1278 condlog(2, "--------start up--------");
1279 condlog(2, "read " DEFAULT_CONFIGFILE);
1281 if (load_config(DEFAULT_CONFIGFILE))
1284 if (init_checkers()) {
1285 condlog(0, "failed to initialize checkers");
1289 condlog(0, "failed to initialize prioritizers");
1293 setlogmask(LOG_UPTO(conf->verbosity + 3));
1296 * fill the voids left in the config file
1298 if (!conf->checkint) {
1299 conf->checkint = DEFAULT_CHECKINT;
1300 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1303 if (conf->max_fds) {
1304 struct rlimit fd_limit;
1305 if (conf->max_fds > 0) {
1306 fd_limit.rlim_cur = conf->max_fds;
1307 fd_limit.rlim_max = conf->max_fds;
1310 fd_limit.rlim_cur = RLIM_INFINITY;
1311 fd_limit.rlim_max = RLIM_INFINITY;
1313 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1314 condlog(0, "can't set open fds limit to %d : %s\n",
1315 conf->max_fds, strerror(errno));
1318 if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1327 vecs = gvecs = init_vecs();
1332 if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1333 condlog(0, "can not find sysfs mount point");
1338 * fetch and configure both paths and multipaths
1340 if (configure(vecs, 1)) {
1341 condlog(0, "failure during configuration");
1348 pthread_attr_init(&attr);
1349 pthread_attr_setstacksize(&attr, 64 * 1024);
1350 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
1352 pthread_create(&check_thr, &attr, checkerloop, vecs);
1353 pthread_create(&uevent_thr, &attr, ueventloop, vecs);
1354 pthread_create(&uxlsnr_thr, &attr, uxlsnrloop, vecs);
1356 pthread_cond_wait(&exit_cond, &exit_mutex);
1362 remove_maps_and_stop_waiters(vecs);
1363 free_pathvec(vecs->pathvec, FREE_PATHS);
1365 pthread_cancel(check_thr);
1366 pthread_cancel(uevent_thr);
1367 pthread_cancel(uxlsnr_thr);
1373 free_handlers(handlers);
1378 pthread_mutex_destroy(vecs->lock);
1384 condlog(2, "--------shut down-------");
1393 * Freeing config must be done after condlog() and dm_lib_exit(),
1394 * because logging functions like dlog() and dm_write_log()
1395 * reference the config.
1401 dbg_free_final(NULL);
1413 if( (pid = fork()) < 0){
1414 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1422 if ( (pid = fork()) < 0)
1423 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1427 in_fd = open("/dev/null", O_RDONLY);
1429 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1433 out_fd = open("/dev/console", O_WRONLY);
1435 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1440 close(STDIN_FILENO);
1442 close(STDOUT_FILENO);
1444 close(STDERR_FILENO);
1455 main (int argc, char *argv[])
1457 extern char *optarg;
1465 if (getuid() != 0) {
1466 fprintf(stderr, "need to be root\n");
1470 /* make sure we don't lock any path */
1472 umask(umask(077) | 022);
1474 conf = alloc_config();
1479 while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1483 //debug=1; /* ### comment me out ### */
1486 if (sizeof(optarg) > sizeof(char *) ||
1487 !isdigit(optarg[0]))
1490 conf->verbosity = atoi(optarg);
1499 if (optind < argc) {
1504 while (optind < argc) {
1505 if (strchr(argv[optind], ' '))
1506 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1508 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1511 c += snprintf(c, s + CMDSIZE - c, "\n");
1529 return (child(NULL));