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>
36 #include <blacklist.h>
37 #include <structs_vec.h>
39 #include <devmapper.h>
42 #include <discovery.h>
46 #include <switchgroup.h>
48 #include <configure.h>
50 #include <pgpolicies.h>
57 #include "cli_handlers.h"
61 #define FILE_NAME_SIZE 256
64 #define LOG_MSG(a,b) \
65 if (strlen(b)) condlog(a, "%s: %s - %s", pp->mpp->alias, pp->dev, b);
67 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
68 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
73 * global copy of vecs for use in sig handlers
75 struct vectors * gvecs;
78 need_switch_pathgroup (struct multipath * mpp, int refresh)
80 struct pathgroup * pgp;
84 if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
88 * Refresh path priority values
91 vector_foreach_slot (mpp->pg, pgp, i)
92 vector_foreach_slot (pgp->paths, pp, j)
93 pathinfo(pp, conf->hwtable, DI_PRIO);
95 mpp->bestpg = select_path_group(mpp);
97 if (mpp->bestpg != mpp->nextpg)
104 switch_pathgroup (struct multipath * mpp)
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);
113 coalesce_maps(struct vectors *vecs, vector nmpv)
115 struct multipath * ompp;
116 vector ompv = vecs->mpvec;
120 vector_foreach_slot (ompv, ompp, i) {
121 if (!find_mp_by_wwid(nmpv, ompp->wwid)) {
123 * remove all current maps not allowed by the
124 * current configuration
126 if (dm_flush_map(ompp->alias)) {
127 condlog(0, "%s: unable to flush devmap",
130 * may be just because the device is open
132 if (!vector_alloc_slot(nmpv))
135 vector_set_slot(nmpv, ompp);
136 setup_multipath(vecs, ompp);
138 if ((j = find_slot(ompv, (void *)ompp)) != -1)
139 vector_del_slot(ompv, j);
145 condlog(2, "%s devmap removed", ompp->alias);
153 sync_map_state(struct multipath *mpp)
155 struct pathgroup *pgp;
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)
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);
181 sync_maps_state(vector mpvec)
184 struct multipath *mpp;
186 vector_foreach_slot (mpvec, mpp, i)
191 flush_map(struct multipath * mpp, struct vectors * vecs)
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
197 if (dm_flush_map(mpp->alias)) {
199 * May not really be an error -- if the map was already flushed
200 * from the device mapper by dmsetup(8) for instance.
202 condlog(0, "%s: can't flush", mpp->alias);
207 condlog(2, "%s: devmap removed", mpp->alias);
210 orphan_paths(vecs->pathvec, mpp);
211 remove_map_and_stop_waiter(mpp, vecs, 1);
217 uev_add_map (struct sysfs_device * dev, struct vectors * vecs)
219 condlog(2, "%s: add map (uevent)", dev->kernel);
220 return ev_add_map(dev, vecs);
224 ev_add_map (struct sysfs_device * dev, struct vectors * vecs)
230 struct multipath * mpp;
234 dev_t = sysfs_attr_get_value(dev->devpath, "dev");
236 if (!dev_t || sscanf(dev_t, "%d:%d", &major, &minor) != 2)
239 alias = dm_mapname(major, minor);
244 map_present = dm_map_present(alias);
246 if (map_present && dm_type(alias, TGT_MPATH) <= 0) {
247 condlog(4, "%s: not a multipath map", alias);
252 mpp = find_mp_by_alias(vecs->mpvec, alias);
256 * Not really an error -- we generate our own uevent
257 * if we create a multipath mapped device as a result
260 condlog(0, "%s: devmap already registered",
267 * now we can register the map
269 if (map_present && (mpp = add_map_without_path(vecs, minor, alias))) {
271 condlog(2, "%s: devmap %s added", alias, dev->kernel);
274 refwwid = get_refwwid(dev->kernel, DEV_DEVMAP, vecs->pathvec);
277 r = coalesce_paths(vecs, NULL, refwwid, 0);
282 condlog(2, "%s: devmap %s added", alias, dev->kernel);
284 condlog(0, "%s: uev_add_map %s failed", alias, dev->kernel);
292 uev_remove_map (struct sysfs_device * dev, struct vectors * vecs)
294 condlog(2, "%s: remove map (uevent)", dev->kernel);
295 return ev_remove_map(dev->kernel, vecs);
299 ev_remove_map (char * devname, struct vectors * vecs)
301 struct multipath * mpp;
303 mpp = find_mp_by_str(vecs->mpvec, devname);
306 condlog(2, "%s: devmap not registered, can't remove",
310 flush_map(mpp, vecs);
316 uev_umount_map (struct sysfs_device * dev, struct vectors * vecs)
318 struct multipath * mpp;
320 condlog(2, "%s: umount map (uevent)", dev->kernel);
322 mpp = find_mp_by_str(vecs->mpvec, dev->kernel);
327 update_mpp_paths(mpp, vecs->pathvec);
328 verify_paths(mpp, vecs, NULL);
330 if (!VECTOR_SIZE(mpp->paths))
331 flush_map(mpp, vecs);
337 uev_add_path (struct sysfs_device * dev, struct vectors * vecs)
339 condlog(2, "%s: add path (uevent)", dev->kernel);
340 return (ev_add_path(dev->kernel, vecs) != 1)? 0 : 1;
351 ev_add_path (char * devname, struct vectors * vecs)
353 struct multipath * mpp;
355 char empty_buff[WWID_SIZE] = {0};
357 if (strstr(devname, "..") != NULL) {
359 * Don't allow relative device names in the pathvec
361 condlog(0, "%s: path name is invalid", devname);
365 pp = find_path_by_dev(vecs->pathvec, devname);
368 condlog(0, "%s: spurious uevent, path already in pathvec",
375 * get path vital state
377 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
379 condlog(0, "%s: failed to store path info", devname);
382 pp->checkint = conf->checkint;
386 * need path UID to go any further
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 */
392 if (filter_path(conf, pp) > 0){
393 int i = find_slot(vecs->pathvec, (void *)pp);
395 vector_del_slot(vecs->pathvec, i);
399 mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
402 if ((!pp->size) || (mpp->size != pp->size)) {
404 condlog(0, "%s: failed to add new path %s, "
408 condlog(0, "%s: failed to add new path %s, "
409 "device size mismatch",
411 int i = find_slot(vecs->pathvec, (void *)pp);
413 vector_del_slot(vecs->pathvec, i);
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 */
423 verify_paths(mpp, vecs, NULL);
424 mpp->flush_on_last_del = FLUSH_UNDEF;
425 mpp->action = ACT_RELOAD;
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);
433 vector_del_slot(vecs->pathvec, i);
438 condlog(4,"%s: creating new map", pp->dev);
439 if ((mpp = add_map_with_path(vecs, pp, 1)))
440 mpp->action = ACT_CREATE;
442 goto fail; /* leave path added to pathvec */
446 * push the map to the device-mapper
448 if (setup_map(mpp)) {
449 condlog(0, "%s: failed to setup map for addition of new "
450 "path %s", mpp->alias, devname);
454 * reload the map for the multipath mapped device
456 if (domap(mpp) <= 0) {
457 condlog(0, "%s: failed in domap for addition of new "
458 "path %s", mpp->alias, devname);
460 * deal with asynchronous uevents :((
462 if (mpp->action == ACT_RELOAD) {
463 condlog(0, "%s: uev_add_path sleep", mpp->alias);
465 update_mpp_paths(mpp, vecs->pathvec);
474 * update our state from kernel regardless of create or reload
476 if (setup_multipath(vecs, mpp))
481 if (mpp->action == ACT_CREATE &&
482 start_waiter_thread(mpp, vecs))
485 condlog(2, "%s path added to devmap %s", devname, mpp->alias);
489 remove_map(mpp, vecs, 1);
496 uev_remove_path (struct sysfs_device * dev, struct vectors * vecs)
500 condlog(2, "%s: remove path (uevent)", dev->kernel);
501 retval = ev_remove_path(dev->kernel, vecs);
503 sysfs_device_put(dev);
509 ev_remove_path (char * devname, struct vectors * vecs)
511 struct multipath * mpp;
515 pp = find_path_by_dev(vecs->pathvec, devname);
518 /* Not an error; path might have been purged earlier */
519 condlog(0, "%s: path already removed", devname);
524 * avoid referring to the map of an orphaned path
526 if ((mpp = pp->mpp)) {
528 * transform the mp->pg vector of vectors of paths
529 * into a mp->params string to feed the device-mapper
531 if (update_mpp_paths(mpp, vecs->pathvec)) {
532 condlog(0, "%s: failed to update paths",
536 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
537 vector_del_slot(mpp->paths, i);
540 * remove the map IFF removing the last path
542 if (VECTOR_SIZE(mpp->paths) == 0) {
543 char alias[WWID_SIZE];
546 * flush_map will fail if the device is open
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);
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);
556 if (!flush_map(mpp, vecs)) {
557 condlog(2, "%s: removed map after"
558 " removing all paths",
564 * Not an error, continue
568 if (setup_map(mpp)) {
569 condlog(0, "%s: failed to setup map for"
570 " removal of path %s", mpp->alias,
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);
585 * update our state from kernel
587 if (setup_multipath(vecs, mpp)) {
592 condlog(2, "%s: path removed from map %s",
593 devname, mpp->alias);
598 if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
599 vector_del_slot(vecs->pathvec, i);
606 remove_map_and_stop_waiter(mpp, vecs, 1);
611 map_discovery (struct vectors * vecs)
613 struct multipath * mpp;
616 if (dm_get_maps(vecs->mpvec))
619 vector_foreach_slot (vecs->mpvec, mpp, i)
620 if (setup_multipath(vecs, mpp))
627 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
629 struct vectors * vecs;
634 vecs = (struct vectors *)trigger_data;
636 pthread_cleanup_push(cleanup_lock, &vecs->lock);
639 r = parse_cmd(str, reply, len, vecs);
642 *reply = STRDUP("fail\n");
643 *len = strlen(*reply) + 1;
646 else if (!r && *len == 0) {
647 *reply = STRDUP("ok\n");
648 *len = strlen(*reply) + 1;
651 /* else if (r < 0) leave *reply alone */
653 lock_cleanup_pop(vecs->lock);
658 uev_discard(char * devpath)
664 * keep only block devices, discard partitions
666 tmp = strstr(devpath, "/block/");
668 condlog(4, "no /block/ in '%s'", devpath);
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);
680 uev_trigger (struct uevent * uev, void * trigger_data)
683 struct sysfs_device *sysdev;
684 struct vectors * vecs;
686 vecs = (struct vectors *)trigger_data;
688 if (uev_discard(uev->devpath))
691 sysdev = sysfs_device_get(uev->devpath);
699 * Add events are ignored here as the tables
700 * are not fully initialised then.
702 if (!strncmp(sysdev->kernel, "dm-", 3)) {
703 if (!strncmp(uev->action, "change", 6)) {
704 r = uev_add_map(sysdev, vecs);
707 if (!strncmp(uev->action, "remove", 6)) {
708 r = uev_remove_map(sysdev, vecs);
711 if (!strncmp(uev->action, "umount", 6)) {
712 r = uev_umount_map(sysdev, vecs);
719 * path add/remove event
721 if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
725 if (!strncmp(uev->action, "add", 3)) {
726 r = uev_add_path(sysdev, vecs);
729 if (!strncmp(uev->action, "remove", 6)) {
730 r = uev_remove_path(sysdev, vecs);
740 ueventloop (void * ap)
742 block_signal(SIGUSR1, NULL);
743 block_signal(SIGHUP, NULL);
745 if (uevent_listen(&uev_trigger, ap))
746 fprintf(stderr, "error starting uevent listener");
752 uxlsnrloop (void * ap)
754 block_signal(SIGUSR1, NULL);
755 block_signal(SIGHUP, NULL);
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);
792 uxsock_listen(&uxsock_trigger, ap);
798 exit_daemon (int status)
801 fprintf(stderr, "bad exit status. see daemon.log\n");
803 condlog(3, "unlink pidfile");
804 unlink(DEFAULT_PIDFILE);
806 pthread_mutex_lock(&exit_mutex);
807 pthread_cond_signal(&exit_cond);
808 pthread_mutex_unlock(&exit_mutex);
814 fail_path (struct path * pp, int del_active)
819 condlog(2, "checker failed path %s in map %s",
820 pp->dev_t, pp->mpp->alias);
822 dm_fail_path(pp->mpp->alias, pp->dev_t);
824 update_queue_mode_del_path(pp->mpp);
828 * caller must have locked the path list before calling that function
831 reinstate_path (struct path * pp, int add_active)
836 if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
837 condlog(0, "%s: reinstate failed", pp->dev_t);
839 condlog(2, "%s: reinstated", pp->dev_t);
841 update_queue_mode_add_path(pp->mpp);
846 enable_group(struct path * pp)
848 struct pathgroup * pgp;
851 * if path is added through uev_add_path, pgindex can be unset.
852 * next update_strings() will set it, upon map reload event.
854 * we can safely return here, because upon map reload, all
855 * PG will be enabled.
857 if (!pp->mpp->pg || !pp->pgindex)
860 pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
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);
869 mpvec_garbage_collector (struct vectors * vecs)
871 struct multipath * mpp;
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);
887 defered_failback_tick (vector mpvec)
889 struct multipath * mpp;
892 vector_foreach_slot (mpvec, mpp, i) {
894 * defered failback getting sooner
896 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
897 mpp->failback_tick--;
899 if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
900 switch_pathgroup(mpp);
906 retry_count_tick(vector mpvec)
908 struct multipath *mpp;
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);
923 int update_prio(struct path *pp, int refresh_all)
927 struct pathgroup * pgp;
928 int i, j, changed = 0;
931 vector_foreach_slot (pp->mpp->pg, pgp, i) {
932 vector_foreach_slot (pgp->paths, pp1, j) {
933 oldpriority = pp1->priority;
934 pathinfo(pp1, conf->hwtable, DI_PRIO);
935 if (pp1->priority != oldpriority)
941 oldpriority = pp->priority;
942 pathinfo(pp, conf->hwtable, DI_PRIO);
944 if (pp->priority == oldpriority)
949 int update_path_groups(struct multipath *mpp, struct vectors *vecs, int refresh)
954 update_mpp_paths(mpp, vecs->pathvec);
956 vector_foreach_slot (mpp->paths, pp, i)
957 pathinfo(pp, conf->hwtable, DI_PRIO);
960 mpp->action = ACT_RELOAD;
961 if (domap(mpp) <= 0) {
962 condlog(0, "%s: failed to update map : %s", mpp->alias,
967 setup_multipath(vecs, mpp);
974 check_path (struct vectors * vecs, struct path * pp)
982 if (pp->tick && --pp->tick)
983 return; /* don't check this path yet */
986 * provision a next check soonest,
987 * in case we exit abnormaly from here
989 pp->tick = conf->checkint;
991 newstate = get_state(pp, 1);
993 if (newstate == PATH_WILD || newstate == PATH_UNCHECKED) {
994 condlog(2, "%s: unusable path", pp->dev);
995 pathinfo(pp, conf->hwtable, 0);
999 * Async IO in flight. Keep the previous path state
1000 * and reschedule as soon as possible
1002 if (newstate == PATH_PENDING) {
1006 if (newstate != pp->state) {
1007 int oldstate = pp->state;
1008 pp->state = newstate;
1009 LOG_MSG(1, checker_message(&pp->checker));
1012 * upon state change, reset the checkint
1013 * to the shortest delay
1015 pp->checkint = conf->checkint;
1017 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
1018 update_multipath_strings(pp->mpp, vecs->pathvec)) {
1020 * proactively fail path in the DM
1022 if (oldstate == PATH_UP ||
1023 oldstate == PATH_GHOST)
1029 * cancel scheduled failback
1031 pp->mpp->failback_tick = 0;
1033 pp->mpp->stat_path_failures++;
1038 * reinstate this path
1040 if (oldstate != PATH_UP &&
1041 oldstate != PATH_GHOST)
1042 reinstate_path(pp, 1);
1044 reinstate_path(pp, 0);
1049 * if at least one path is up in a group, and
1050 * the group is disabled, re-enable it
1052 if (newstate == PATH_UP)
1055 else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1056 LOG_MSG(4, checker_message(&pp->checker));
1058 * double the next check delay.
1059 * max at conf->max_checkint
1061 if (pp->checkint < (conf->max_checkint / 2))
1062 pp->checkint = 2 * pp->checkint;
1064 pp->checkint = conf->max_checkint;
1066 pp->tick = pp->checkint;
1067 condlog(4, "%s: delay next check %is",
1068 pp->dev_t, pp->tick);
1070 else if (newstate == PATH_DOWN)
1071 LOG_MSG(2, checker_message(&pp->checker));
1073 pp->state = newstate;
1076 * path prio refreshing
1078 condlog(4, "path prio refresh");
1080 if (update_prio(pp, new_path_up) &&
1081 pp->mpp->pgpolicyfn == (pgpolicyfn *)group_by_prio)
1082 update_path_groups(pp->mpp, vecs, !new_path_up);
1083 else if (need_switch_pathgroup(pp->mpp, 0)) {
1084 if (pp->mpp->pgfailback > 0 &&
1085 (new_path_up || pp->mpp->failback_tick <= 0))
1086 pp->mpp->failback_tick =
1087 pp->mpp->pgfailback + 1;
1088 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE)
1089 switch_pathgroup(pp->mpp);
1094 checkerloop (void *ap)
1096 struct vectors *vecs;
1102 mlockall(MCL_CURRENT | MCL_FUTURE);
1103 vecs = (struct vectors *)ap;
1104 condlog(2, "path checkers start up");
1107 * init the path check interval
1109 vector_foreach_slot (vecs->pathvec, pp, i) {
1110 pp->checkint = conf->checkint;
1114 block_signal(SIGHUP, &old);
1115 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1119 if (vecs->pathvec) {
1120 vector_foreach_slot (vecs->pathvec, pp, i) {
1121 check_path(vecs, pp);
1125 defered_failback_tick(vecs->mpvec);
1126 retry_count_tick(vecs->mpvec);
1131 condlog(4, "map garbage collection");
1132 mpvec_garbage_collector(vecs);
1136 lock_cleanup_pop(vecs->lock);
1137 pthread_sigmask(SIG_SETMASK, &old, NULL);
1144 configure (struct vectors * vecs, int start_waiters)
1146 struct multipath * mpp;
1151 if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1154 if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1157 if (!(mpvec = vector_alloc()))
1161 * probe for current path (from sysfs) and map (from dm) sets
1163 path_discovery(vecs->pathvec, conf, DI_ALL);
1165 vector_foreach_slot (vecs->pathvec, pp, i){
1166 if (filter_path(conf, pp) > 0){
1167 vector_del_slot(vecs->pathvec, i);
1172 pp->checkint = conf->checkint;
1174 if (map_discovery(vecs))
1178 * create new set of maps & push changed ones into dm
1180 if (coalesce_paths(vecs, mpvec, NULL, 1))
1184 * may need to remove some maps which are no longer relevant
1185 * e.g., due to blacklist changes in conf file
1187 if (coalesce_maps(vecs, mpvec))
1192 sync_maps_state(mpvec);
1195 * purge dm of old maps
1200 * save new set of maps formed by considering current path state
1202 vector_free(vecs->mpvec);
1203 vecs->mpvec = mpvec;
1206 * start dm event waiter threads for these new maps
1208 vector_foreach_slot(vecs->mpvec, mpp, i) {
1209 if (setup_multipath(vecs, mpp))
1212 if (start_waiter_thread(mpp, vecs))
1219 reconfigure (struct vectors * vecs)
1221 struct config * old = conf;
1224 * free old map and path vectors ... they use old conf state
1226 if (VECTOR_SIZE(vecs->mpvec))
1227 remove_maps_and_stop_waiters(vecs);
1229 if (VECTOR_SIZE(vecs->pathvec))
1230 free_pathvec(vecs->pathvec, FREE_PATHS);
1232 vecs->pathvec = NULL;
1235 if (load_config(DEFAULT_CONFIGFILE))
1238 conf->verbosity = old->verbosity;
1240 if (!conf->checkint) {
1241 conf->checkint = DEFAULT_CHECKINT;
1242 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1250 static struct vectors *
1253 struct vectors * vecs;
1255 vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1261 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1263 if (!vecs->lock.mutex)
1266 pthread_mutex_init(vecs->lock.mutex, NULL);
1267 vecs->lock.depth = 0;
1273 condlog(0, "failed to init paths");
1278 signal_set(int signo, void (*func) (int))
1281 struct sigaction sig;
1282 struct sigaction osig;
1284 sig.sa_handler = func;
1285 sigemptyset(&sig.sa_mask);
1288 r = sigaction(signo, &sig, &osig);
1293 return (osig.sa_handler);
1299 condlog(2, "reconfigure (SIGHUP)");
1303 unlock(gvecs->lock);
1306 dbg_free_final(NULL);
1319 condlog(3, "SIGUSR1 received");
1325 signal_set(SIGHUP, sighup);
1326 signal_set(SIGUSR1, sigusr1);
1327 signal_set(SIGINT, sigend);
1328 signal_set(SIGTERM, sigend);
1329 signal(SIGPIPE, SIG_IGN);
1336 static struct sched_param sched_param = {
1337 .sched_priority = 99
1340 res = sched_setscheduler (0, SCHED_RR, &sched_param);
1343 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1348 set_oom_adj (int val)
1352 fp = fopen("/proc/self/oom_adj", "w");
1357 fprintf(fp, "%i", val);
1362 setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
1364 if (pthread_attr_init(attr)) {
1365 fprintf(stderr, "can't initialize thread attr: %s\n",
1369 if (stacksize < PTHREAD_STACK_MIN)
1370 stacksize = PTHREAD_STACK_MIN;
1372 if (pthread_attr_setstacksize(attr, stacksize)) {
1373 fprintf(stderr, "can't set thread stack size to %lu: %s\n",
1374 (unsigned long)stacksize, strerror(errno));
1377 if (detached && pthread_attr_setdetachstate(attr,
1378 PTHREAD_CREATE_DETACHED)) {
1379 fprintf(stderr, "can't set thread to detached: %s\n",
1386 child (void * param)
1388 pthread_t check_thr, uevent_thr, uxlsnr_thr;
1389 pthread_attr_t log_attr, misc_attr;
1390 struct vectors * vecs;
1391 struct multipath * mpp;
1394 mlockall(MCL_CURRENT | MCL_FUTURE);
1396 setup_thread_attr(&misc_attr, 64 * 1024, 1);
1397 setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1400 setup_thread_attr(&log_attr, 64 * 1024, 0);
1401 log_thread_start(&log_attr);
1402 pthread_attr_destroy(&log_attr);
1405 condlog(2, "--------start up--------");
1406 condlog(2, "read " DEFAULT_CONFIGFILE);
1408 if (load_config(DEFAULT_CONFIGFILE))
1411 if (init_checkers()) {
1412 condlog(0, "failed to initialize checkers");
1416 condlog(0, "failed to initialize prioritizers");
1420 setlogmask(LOG_UPTO(conf->verbosity + 3));
1423 * fill the voids left in the config file
1425 if (!conf->checkint) {
1426 conf->checkint = DEFAULT_CHECKINT;
1427 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1430 if (conf->max_fds) {
1431 struct rlimit fd_limit;
1433 fd_limit.rlim_cur = conf->max_fds;
1434 fd_limit.rlim_max = conf->max_fds;
1435 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1436 condlog(0, "can't set open fds limit to %d : %s\n",
1437 conf->max_fds, strerror(errno));
1440 if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1449 vecs = gvecs = init_vecs();
1454 if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1455 condlog(0, "can not find sysfs mount point");
1459 udev_set_sync_support(0);
1461 * fetch and configure both paths and multipaths
1463 if (configure(vecs, 1)) {
1464 condlog(0, "failure during configuration");
1470 pthread_create(&check_thr, &misc_attr, checkerloop, vecs);
1471 pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs);
1472 pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs);
1473 pthread_attr_destroy(&misc_attr);
1475 pthread_mutex_lock(&exit_mutex);
1476 pthread_cond_wait(&exit_cond, &exit_mutex);
1481 block_signal(SIGHUP, NULL);
1483 if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF)
1484 vector_foreach_slot(vecs->mpvec, mpp, i)
1485 dm_queue_if_no_path(mpp->alias, 0);
1486 remove_maps_and_stop_waiters(vecs);
1487 free_pathvec(vecs->pathvec, FREE_PATHS);
1489 pthread_cancel(check_thr);
1490 pthread_cancel(uevent_thr);
1491 pthread_cancel(uxlsnr_thr);
1497 free_handlers(handlers);
1502 /* Now all the waitevent threads will start rushing in. */
1503 while (vecs->lock.depth > 0) {
1504 sleep (1); /* This is weak. */
1505 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1507 pthread_mutex_destroy(vecs->lock.mutex);
1508 FREE(vecs->lock.mutex);
1509 vecs->lock.depth = 0;
1510 vecs->lock.mutex = NULL;
1514 condlog(2, "--------shut down-------");
1525 * Freeing config must be done after condlog() and dm_lib_exit(),
1526 * because logging functions like dlog() and dm_write_log()
1527 * reference the config.
1533 dbg_free_final(NULL);
1545 if( (pid = fork()) < 0){
1546 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1554 if ( (pid = fork()) < 0)
1555 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1559 in_fd = open("/dev/null", O_RDONLY);
1561 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1565 out_fd = open("/dev/console", O_WRONLY);
1567 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1572 close(STDIN_FILENO);
1574 close(STDOUT_FILENO);
1576 close(STDERR_FILENO);
1582 fprintf(stderr, "cannot chdir to '/', continuing\n");
1588 main (int argc, char *argv[])
1590 extern char *optarg;
1598 if (getuid() != 0) {
1599 fprintf(stderr, "need to be root\n");
1603 /* make sure we don't lock any path */
1605 umask(umask(077) | 022);
1607 conf = alloc_config();
1612 while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1616 //debug=1; /* ### comment me out ### */
1619 if (sizeof(optarg) > sizeof(char *) ||
1620 !isdigit(optarg[0]))
1623 conf->verbosity = atoi(optarg);
1632 if (optind < argc) {
1637 while (optind < argc) {
1638 if (strchr(argv[optind], ' '))
1639 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1641 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1644 c += snprintf(c, s + CMDSIZE - c, "\n");
1662 return (child(NULL));