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>
18 #include <linux/oom.h>
37 #include <blacklist.h>
38 #include <structs_vec.h>
40 #include <devmapper.h>
43 #include <discovery.h>
47 #include <switchgroup.h>
49 #include <configure.h>
51 #include <pgpolicies.h>
59 #include "cli_handlers.h"
63 #define FILE_NAME_SIZE 256
66 #define LOG_MSG(a, b) \
69 condlog(a, "%s: %s - path offline", pp->mpp->alias, pp->dev); \
71 condlog(a, "%s: %s - %s", pp->mpp->alias, pp->dev, b); \
74 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
75 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
78 enum daemon_status running_state;
82 * global copy of vecs for use in sig handlers
84 struct vectors * gvecs;
87 need_switch_pathgroup (struct multipath * mpp, int refresh)
89 struct pathgroup * pgp;
93 if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
97 * Refresh path priority values
100 vector_foreach_slot (mpp->pg, pgp, i)
101 vector_foreach_slot (pgp->paths, pp, j)
102 pathinfo(pp, conf->hwtable, DI_PRIO);
104 mpp->bestpg = select_path_group(mpp);
106 if (mpp->bestpg != mpp->nextpg)
113 switch_pathgroup (struct multipath * mpp)
115 mpp->stat_switchgroup++;
116 dm_switchgroup(mpp->alias, mpp->bestpg);
117 condlog(2, "%s: switch to path group #%i",
118 mpp->alias, mpp->bestpg);
122 coalesce_maps(struct vectors *vecs, vector nmpv)
124 struct multipath * ompp;
125 vector ompv = vecs->mpvec;
129 vector_foreach_slot (ompv, ompp, i) {
130 if (!find_mp_by_wwid(nmpv, ompp->wwid)) {
132 * remove all current maps not allowed by the
133 * current configuration
135 if (dm_flush_map(ompp->alias)) {
136 condlog(0, "%s: unable to flush devmap",
139 * may be just because the device is open
141 if (!vector_alloc_slot(nmpv))
144 vector_set_slot(nmpv, ompp);
145 setup_multipath(vecs, ompp);
147 if ((j = find_slot(ompv, (void *)ompp)) != -1)
148 vector_del_slot(ompv, j);
154 condlog(2, "%s devmap removed", ompp->alias);
156 } else if (conf->reassign_maps) {
157 condlog(3, "%s: Reassign existing device-mapper"
158 " devices", ompp->alias);
159 dm_reassign(ompp->alias);
166 sync_map_state(struct multipath *mpp)
168 struct pathgroup *pgp;
175 vector_foreach_slot (mpp->pg, pgp, i){
176 vector_foreach_slot (pgp->paths, pp, j){
177 if (pp->state == PATH_UNCHECKED ||
178 pp->state == PATH_WILD)
180 if ((pp->dmstate == PSTATE_FAILED ||
181 pp->dmstate == PSTATE_UNDEF) &&
182 (pp->state == PATH_UP || pp->state == PATH_GHOST))
183 dm_reinstate_path(mpp->alias, pp->dev_t);
184 else if ((pp->dmstate == PSTATE_ACTIVE ||
185 pp->dmstate == PSTATE_UNDEF) &&
186 (pp->state == PATH_DOWN ||
187 pp->state == PATH_SHAKY))
188 dm_fail_path(mpp->alias, pp->dev_t);
194 sync_maps_state(vector mpvec)
197 struct multipath *mpp;
199 vector_foreach_slot (mpvec, mpp, i)
204 flush_map(struct multipath * mpp, struct vectors * vecs)
207 * clear references to this map before flushing so we can ignore
208 * the spurious uevent we may generate with the dm_flush_map call below
210 if (dm_flush_map(mpp->alias)) {
212 * May not really be an error -- if the map was already flushed
213 * from the device mapper by dmsetup(8) for instance.
215 condlog(0, "%s: can't flush", mpp->alias);
220 condlog(2, "%s: devmap removed", mpp->alias);
223 orphan_paths(vecs->pathvec, mpp);
224 remove_map_and_stop_waiter(mpp, vecs, 1);
230 uev_add_map (struct uevent * uev, struct vectors * vecs)
233 int major = -1, minor = -1, rc;
235 condlog(3, "%s: add map (uevent)", uev->kernel);
236 alias = uevent_get_dm_name(uev);
238 condlog(3, "%s: No DM_NAME in uevent", uev->kernel);
239 major = uevent_get_major(uev);
240 minor = uevent_get_minor(uev);
241 alias = dm_mapname(major, minor);
243 condlog(2, "%s: mapname not found for %d:%d",
244 uev->kernel, major, minor);
248 rc = ev_add_map(uev->kernel, alias, vecs);
254 ev_add_map (char * dev, char * alias, struct vectors * vecs)
257 struct multipath * mpp;
261 map_present = dm_map_present(alias);
263 if (map_present && dm_type(alias, TGT_MPATH) <= 0) {
264 condlog(4, "%s: not a multipath map", alias);
268 mpp = find_mp_by_alias(vecs->mpvec, alias);
272 * Not really an error -- we generate our own uevent
273 * if we create a multipath mapped device as a result
276 if (conf->reassign_maps) {
277 condlog(3, "%s: Reassign existing device-mapper devices",
283 condlog(2, "%s: adding map", alias);
286 * now we can register the map
288 if (map_present && (mpp = add_map_without_path(vecs, alias))) {
290 condlog(2, "%s: devmap %s registered", alias, dev);
293 refwwid = get_refwwid(dev, DEV_DEVMAP, vecs->pathvec);
296 r = coalesce_paths(vecs, NULL, refwwid, 0);
301 condlog(2, "%s: devmap %s added", alias, dev);
303 condlog(0, "%s: uev_add_map %s failed", alias, dev);
310 uev_remove_map (struct uevent * uev, struct vectors * vecs)
315 condlog(2, "%s: remove map (uevent)", uev->kernel);
316 alias = uevent_get_dm_name(uev);
318 condlog(3, "%s: No DM_NAME in uevent, ignoring", uev->kernel);
321 minor = uevent_get_minor(uev);
322 rc = ev_remove_map(uev->kernel, alias, minor, vecs);
328 ev_remove_map (char * devname, char * alias, int minor, struct vectors * vecs)
330 struct multipath * mpp;
332 mpp = find_mp_by_minor(vecs->mpvec, minor);
335 condlog(2, "%s: devmap not registered, can't remove",
339 if (strcmp(mpp->alias, alias)) {
340 condlog(2, "%s: minor number mismatch (map %d, event %d)",
341 mpp->alias, mpp->dmi->minor, minor);
344 return flush_map(mpp, vecs);
348 uev_add_path (struct uevent *uev, struct vectors * vecs)
350 struct sysfs_device * dev;
352 dev = sysfs_device_get(uev->devpath);
354 condlog(2, "%s: not found in sysfs", uev->devpath);
357 condlog(2, "%s: add path (uevent)", dev->kernel);
358 return (ev_add_path(dev->kernel, vecs) != 1)? 0 : 1;
368 ev_add_path (char * devname, struct vectors * vecs)
370 struct multipath * mpp;
372 char empty_buff[WWID_SIZE] = {0};
373 char params[PARAMS_SIZE] = {0};
375 int start_waiter = 0;
377 if (strstr(devname, "..") != NULL) {
379 * Don't allow relative device names in the pathvec
381 condlog(0, "%s: path name is invalid", devname);
385 pp = find_path_by_dev(vecs->pathvec, devname);
388 condlog(0, "%s: spurious uevent, path already in pathvec",
395 * get path vital state
397 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
399 condlog(0, "%s: failed to store path info", devname);
402 pp->checkint = conf->checkint;
406 * need path UID to go any further
408 if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
409 condlog(0, "%s: failed to get path uid", devname);
410 goto fail; /* leave path added to pathvec */
412 if (filter_path(conf, pp) > 0){
413 int i = find_slot(vecs->pathvec, (void *)pp);
415 vector_del_slot(vecs->pathvec, i);
419 mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
422 if ((!pp->size) || (mpp->size != pp->size)) {
424 condlog(0, "%s: failed to add new path %s, "
428 condlog(0, "%s: failed to add new path %s, "
429 "device size mismatch",
431 int i = find_slot(vecs->pathvec, (void *)pp);
433 vector_del_slot(vecs->pathvec, i);
438 condlog(4,"%s: adopting all paths for path %s",
439 mpp->alias, pp->dev);
440 if (adopt_paths(vecs->pathvec, mpp, 1))
441 goto fail; /* leave path added to pathvec */
443 verify_paths(mpp, vecs, NULL);
444 mpp->flush_on_last_del = FLUSH_UNDEF;
445 mpp->action = ACT_RELOAD;
449 condlog(0, "%s: failed to create new map,"
450 " %s device size is 0 ", devname, pp->dev);
451 int i = find_slot(vecs->pathvec, (void *)pp);
453 vector_del_slot(vecs->pathvec, i);
458 condlog(4,"%s: creating new map", pp->dev);
459 if ((mpp = add_map_with_path(vecs, pp, 1))) {
460 mpp->action = ACT_CREATE;
462 * We don't depend on ACT_CREATE, as domap will
463 * set it to ACT_NOTHING when complete.
468 goto fail; /* leave path added to pathvec */
472 * push the map to the device-mapper
474 if (setup_map(mpp, params, PARAMS_SIZE)) {
475 condlog(0, "%s: failed to setup map for addition of new "
476 "path %s", mpp->alias, devname);
480 * reload the map for the multipath mapped device
482 if (domap(mpp, params) <= 0) {
483 condlog(0, "%s: failed in domap for addition of new "
484 "path %s", mpp->alias, devname);
486 * deal with asynchronous uevents :((
488 if (mpp->action == ACT_RELOAD && retries-- > 0) {
489 condlog(0, "%s: uev_add_path sleep", mpp->alias);
491 update_mpp_paths(mpp, vecs->pathvec);
494 else if (mpp->action == ACT_RELOAD)
495 condlog(0, "%s: giving up reload", mpp->alias);
502 * update our state from kernel regardless of create or reload
504 if (setup_multipath(vecs, mpp))
509 if ((mpp->action == ACT_CREATE ||
510 (mpp->action == ACT_NOTHING && start_waiter && !mpp->waiter)) &&
511 start_waiter_thread(mpp, vecs))
515 condlog(2, "%s path added to devmap %s", devname, mpp->alias);
522 remove_map(mpp, vecs, 1);
529 uev_remove_path (struct uevent *uev, struct vectors * vecs)
531 struct sysfs_device * dev;
534 dev = sysfs_device_get(uev->devpath);
536 condlog(2, "%s: not found in sysfs", uev->devpath);
539 condlog(2, "%s: remove path (uevent)", uev->kernel);
540 retval = ev_remove_path(uev->kernel, vecs);
543 sysfs_device_put(dev);
549 ev_remove_path (char * devname, struct vectors * vecs)
551 struct multipath * mpp;
554 char params[PARAMS_SIZE] = {0};
556 pp = find_path_by_dev(vecs->pathvec, devname);
559 /* Not an error; path might have been purged earlier */
560 condlog(0, "%s: path already removed", devname);
565 * avoid referring to the map of an orphaned path
567 if ((mpp = pp->mpp)) {
569 * transform the mp->pg vector of vectors of paths
570 * into a mp->params string to feed the device-mapper
572 if (update_mpp_paths(mpp, vecs->pathvec)) {
573 condlog(0, "%s: failed to update paths",
577 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
578 vector_del_slot(mpp->paths, i);
581 * remove the map IFF removing the last path
583 if (VECTOR_SIZE(mpp->paths) == 0) {
584 char alias[WWID_SIZE];
587 * flush_map will fail if the device is open
589 strncpy(alias, mpp->alias, WWID_SIZE);
590 if (mpp->flush_on_last_del == FLUSH_ENABLED) {
591 condlog(2, "%s Last path deleted, disabling queueing", mpp->alias);
593 mpp->no_path_retry = NO_PATH_RETRY_FAIL;
594 mpp->flush_on_last_del = FLUSH_IN_PROGRESS;
595 dm_queue_if_no_path(mpp->alias, 0);
597 if (!flush_map(mpp, vecs)) {
598 condlog(2, "%s: removed map after"
599 " removing all paths",
605 * Not an error, continue
609 if (setup_map(mpp, params, PARAMS_SIZE)) {
610 condlog(0, "%s: failed to setup map for"
611 " removal of path %s", mpp->alias,
618 mpp->action = ACT_RELOAD;
619 if (domap(mpp, params) <= 0) {
620 condlog(0, "%s: failed in domap for "
621 "removal of path %s",
622 mpp->alias, devname);
626 * update our state from kernel
628 if (setup_multipath(vecs, mpp)) {
633 condlog(2, "%s: path removed from map %s",
634 devname, mpp->alias);
639 if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
640 vector_del_slot(vecs->pathvec, i);
647 remove_map_and_stop_waiter(mpp, vecs, 1);
652 uev_update_path (struct uevent *uev, struct vectors * vecs)
654 struct sysfs_device * dev;
657 dev = sysfs_device_get(uev->devpath);
659 condlog(2, "%s: not found in sysfs", uev->devpath);
662 ro = uevent_get_disk_ro(uev);
667 condlog(2, "%s: update path write_protect to '%d' (uevent)",
669 pp = find_path_by_dev(vecs->pathvec, uev->kernel);
671 condlog(0, "%s: spurious uevent, path not found",
676 retval = reload_map(vecs, pp->mpp);
678 condlog(2, "%s: map %s reloaded (retval %d)",
679 uev->kernel, pp->mpp->alias, retval);
683 sysfs_device_put(dev);
689 map_discovery (struct vectors * vecs)
691 struct multipath * mpp;
694 if (dm_get_maps(vecs->mpvec))
697 vector_foreach_slot (vecs->mpvec, mpp, i)
698 if (setup_multipath(vecs, mpp))
705 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
707 struct vectors * vecs;
712 vecs = (struct vectors *)trigger_data;
714 pthread_cleanup_push(cleanup_lock, &vecs->lock);
717 r = parse_cmd(str, reply, len, vecs);
720 *reply = STRDUP("fail\n");
721 *len = strlen(*reply) + 1;
724 else if (!r && *len == 0) {
725 *reply = STRDUP("ok\n");
726 *len = strlen(*reply) + 1;
729 /* else if (r < 0) leave *reply alone */
731 lock_cleanup_pop(vecs->lock);
736 uev_discard(char * devpath)
742 * keep only block devices, discard partitions
744 tmp = strstr(devpath, "/block/");
746 condlog(4, "no /block/ in '%s'", devpath);
749 if (sscanf(tmp, "/block/%10s", a) != 1 ||
750 sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
751 condlog(4, "discard event on %s", devpath);
758 uev_trigger (struct uevent * uev, void * trigger_data)
761 struct vectors * vecs;
763 vecs = (struct vectors *)trigger_data;
765 if (uev_discard(uev->devpath))
772 * Add events are ignored here as the tables
773 * are not fully initialised then.
775 if (!strncmp(uev->kernel, "dm-", 3)) {
776 if (!strncmp(uev->action, "change", 6)) {
777 r = uev_add_map(uev, vecs);
780 if (!strncmp(uev->action, "remove", 6)) {
781 r = uev_remove_map(uev, vecs);
788 * path add/remove event
790 if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
794 if (!strncmp(uev->action, "add", 3)) {
795 r = uev_add_path(uev, vecs);
798 if (!strncmp(uev->action, "remove", 6)) {
799 r = uev_remove_path(uev, vecs);
802 if (!strncmp(uev->action, "change", 6)) {
803 r = uev_update_path(uev, vecs);
813 ueventloop (void * ap)
815 block_signal(SIGUSR1, NULL);
816 block_signal(SIGHUP, NULL);
819 condlog(0, "error starting uevent listener");
827 block_signal(SIGUSR1, NULL);
828 block_signal(SIGHUP, NULL);
830 if (uevent_dispatch(&uev_trigger, ap))
831 condlog(0, "error starting uevent dispatcher");
836 uxlsnrloop (void * ap)
838 block_signal(SIGUSR1, NULL);
839 block_signal(SIGHUP, NULL);
844 set_handler_callback(LIST+PATHS, cli_list_paths);
845 set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
846 set_handler_callback(LIST+MAPS, cli_list_maps);
847 set_handler_callback(LIST+STATUS, cli_list_status);
848 set_handler_callback(LIST+DAEMON, cli_list_daemon);
849 set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
850 set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
851 set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
852 set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
853 set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
854 set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
855 set_handler_callback(LIST+CONFIG, cli_list_config);
856 set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
857 set_handler_callback(LIST+DEVICES, cli_list_devices);
858 set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
859 set_handler_callback(ADD+PATH, cli_add_path);
860 set_handler_callback(DEL+PATH, cli_del_path);
861 set_handler_callback(ADD+MAP, cli_add_map);
862 set_handler_callback(DEL+MAP, cli_del_map);
863 set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
864 set_handler_callback(RECONFIGURE, cli_reconfigure);
865 set_handler_callback(SUSPEND+MAP, cli_suspend);
866 set_handler_callback(RESUME+MAP, cli_resume);
867 set_handler_callback(RESIZE+MAP, cli_resize);
868 set_handler_callback(RELOAD+MAP, cli_reload);
869 set_handler_callback(RESET+MAP, cli_reassign);
870 set_handler_callback(REINSTATE+PATH, cli_reinstate);
871 set_handler_callback(FAIL+PATH, cli_fail);
872 set_handler_callback(DISABLEQ+MAP, cli_disable_queueing);
873 set_handler_callback(RESTOREQ+MAP, cli_restore_queueing);
874 set_handler_callback(DISABLEQ+MAPS, cli_disable_all_queueing);
875 set_handler_callback(RESTOREQ+MAPS, cli_restore_all_queueing);
876 set_handler_callback(QUIT, cli_quit);
877 set_handler_callback(SHUTDOWN, cli_shutdown);
880 uxsock_listen(&uxsock_trigger, ap);
886 exit_daemon (int status)
889 fprintf(stderr, "bad exit status. see daemon.log\n");
891 condlog(3, "unlink pidfile");
892 unlink(DEFAULT_PIDFILE);
894 pthread_mutex_lock(&exit_mutex);
895 pthread_cond_signal(&exit_cond);
896 pthread_mutex_unlock(&exit_mutex);
904 switch (running_state) {
909 case DAEMON_CONFIGURE:
913 case DAEMON_SHUTDOWN:
920 fail_path (struct path * pp, int del_active)
925 condlog(2, "checker failed path %s in map %s",
926 pp->dev_t, pp->mpp->alias);
928 dm_fail_path(pp->mpp->alias, pp->dev_t);
930 update_queue_mode_del_path(pp->mpp);
934 * caller must have locked the path list before calling that function
937 reinstate_path (struct path * pp, int add_active)
942 if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
943 condlog(0, "%s: reinstate failed", pp->dev_t);
945 condlog(2, "%s: reinstated", pp->dev_t);
947 update_queue_mode_add_path(pp->mpp);
952 enable_group(struct path * pp)
954 struct pathgroup * pgp;
957 * if path is added through uev_add_path, pgindex can be unset.
958 * next update_strings() will set it, upon map reload event.
960 * we can safely return here, because upon map reload, all
961 * PG will be enabled.
963 if (!pp->mpp->pg || !pp->pgindex)
966 pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
968 if (pgp->status == PGSTATE_DISABLED) {
969 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
970 dm_enablegroup(pp->mpp->alias, pp->pgindex);
975 mpvec_garbage_collector (struct vectors * vecs)
977 struct multipath * mpp;
983 vector_foreach_slot (vecs->mpvec, mpp, i) {
984 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
985 condlog(2, "%s: remove dead map", mpp->alias);
986 remove_map_and_stop_waiter(mpp, vecs, 1);
993 defered_failback_tick (vector mpvec)
995 struct multipath * mpp;
998 vector_foreach_slot (mpvec, mpp, i) {
1000 * defered failback getting sooner
1002 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
1003 mpp->failback_tick--;
1005 if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
1006 switch_pathgroup(mpp);
1012 retry_count_tick(vector mpvec)
1014 struct multipath *mpp;
1017 vector_foreach_slot (mpvec, mpp, i) {
1018 if (mpp->retry_tick) {
1019 mpp->stat_total_queueing_time++;
1020 condlog(4, "%s: Retrying.. No active path", mpp->alias);
1021 if(--mpp->retry_tick == 0) {
1022 dm_queue_if_no_path(mpp->alias, 0);
1023 condlog(2, "%s: Disable queueing", mpp->alias);
1029 int update_prio(struct path *pp, int refresh_all)
1033 struct pathgroup * pgp;
1034 int i, j, changed = 0;
1037 vector_foreach_slot (pp->mpp->pg, pgp, i) {
1038 vector_foreach_slot (pgp->paths, pp1, j) {
1039 oldpriority = pp1->priority;
1040 pathinfo(pp1, conf->hwtable, DI_PRIO);
1041 if (pp1->priority != oldpriority)
1047 oldpriority = pp->priority;
1048 pathinfo(pp, conf->hwtable, DI_PRIO);
1050 if (pp->priority == oldpriority)
1055 int update_path_groups(struct multipath *mpp, struct vectors *vecs, int refresh)
1059 char params[PARAMS_SIZE];
1061 update_mpp_paths(mpp, vecs->pathvec);
1063 vector_foreach_slot (mpp->paths, pp, i)
1064 pathinfo(pp, conf->hwtable, DI_PRIO);
1067 if (setup_map(mpp, params, PARAMS_SIZE))
1070 mpp->action = ACT_RELOAD;
1071 if (domap(mpp, params) <= 0) {
1072 condlog(0, "%s: failed to update map : %s", mpp->alias,
1077 if (setup_multipath(vecs, mpp) != 0)
1079 sync_map_state(mpp);
1085 check_path (struct vectors * vecs, struct path * pp)
1088 int new_path_up = 0;
1093 if (pp->tick && --pp->tick)
1094 return; /* don't check this path yet */
1097 * provision a next check soonest,
1098 * in case we exit abnormaly from here
1100 pp->tick = conf->checkint;
1102 newstate = path_offline(pp);
1103 if (newstate == PATH_UP)
1104 newstate = get_state(pp, 1);
1106 if (newstate == PATH_WILD || newstate == PATH_UNCHECKED) {
1107 condlog(2, "%s: unusable path", pp->dev);
1108 pathinfo(pp, conf->hwtable, 0);
1112 * Async IO in flight. Keep the previous path state
1113 * and reschedule as soon as possible
1115 if (newstate == PATH_PENDING) {
1120 * Synchronize with kernel state
1122 if (update_multipath_strings(pp->mpp, vecs->pathvec)) {
1123 condlog(1, "%s: Could not synchronize with kernel state\n",
1125 pp->dmstate = PSTATE_UNDEF;
1127 if (newstate != pp->state) {
1128 int oldstate = pp->state;
1129 pp->state = newstate;
1130 LOG_MSG(1, checker_message(&pp->checker));
1133 * upon state change, reset the checkint
1134 * to the shortest delay
1136 pp->checkint = conf->checkint;
1138 if (newstate == PATH_DOWN || newstate == PATH_SHAKY) {
1140 * proactively fail path in the DM
1142 if (oldstate == PATH_UP ||
1143 oldstate == PATH_GHOST)
1149 * cancel scheduled failback
1151 pp->mpp->failback_tick = 0;
1153 pp->mpp->stat_path_failures++;
1158 * reinstate this path
1160 if (oldstate != PATH_UP &&
1161 oldstate != PATH_GHOST)
1162 reinstate_path(pp, 1);
1164 reinstate_path(pp, 0);
1169 * if at least one path is up in a group, and
1170 * the group is disabled, re-enable it
1172 if (newstate == PATH_UP)
1175 else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1176 if (pp->dmstate == PSTATE_FAILED ||
1177 pp->dmstate == PSTATE_UNDEF) {
1178 /* Clear IO errors */
1179 reinstate_path(pp, 0);
1181 LOG_MSG(4, checker_message(&pp->checker));
1183 * double the next check delay.
1184 * max at conf->max_checkint
1186 if (pp->checkint < (conf->max_checkint / 2))
1187 pp->checkint = 2 * pp->checkint;
1189 pp->checkint = conf->max_checkint;
1191 pp->tick = pp->checkint;
1192 condlog(4, "%s: delay next check %is",
1193 pp->dev_t, pp->tick);
1196 else if (newstate == PATH_DOWN)
1197 LOG_MSG(2, checker_message(&pp->checker));
1199 pp->state = newstate;
1202 * path prio refreshing
1204 condlog(4, "path prio refresh");
1206 if (update_prio(pp, new_path_up) &&
1207 (pp->mpp->pgpolicyfn == (pgpolicyfn *)group_by_prio) &&
1208 pp->mpp->pgfailback == -FAILBACK_IMMEDIATE)
1209 update_path_groups(pp->mpp, vecs, !new_path_up);
1210 else if (need_switch_pathgroup(pp->mpp, 0)) {
1211 if (pp->mpp->pgfailback > 0 &&
1212 (new_path_up || pp->mpp->failback_tick <= 0))
1213 pp->mpp->failback_tick =
1214 pp->mpp->pgfailback + 1;
1215 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE)
1216 switch_pathgroup(pp->mpp);
1221 checkerloop (void *ap)
1223 struct vectors *vecs;
1229 mlockall(MCL_CURRENT | MCL_FUTURE);
1230 vecs = (struct vectors *)ap;
1231 condlog(2, "path checkers start up");
1234 * init the path check interval
1236 vector_foreach_slot (vecs->pathvec, pp, i) {
1237 pp->checkint = conf->checkint;
1241 block_signal(SIGHUP, &old);
1242 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1246 if (vecs->pathvec) {
1247 vector_foreach_slot (vecs->pathvec, pp, i) {
1248 check_path(vecs, pp);
1252 defered_failback_tick(vecs->mpvec);
1253 retry_count_tick(vecs->mpvec);
1258 condlog(4, "map garbage collection");
1259 mpvec_garbage_collector(vecs);
1263 lock_cleanup_pop(vecs->lock);
1264 pthread_sigmask(SIG_SETMASK, &old, NULL);
1271 configure (struct vectors * vecs, int start_waiters)
1273 struct multipath * mpp;
1278 if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1281 if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1284 if (!(mpvec = vector_alloc()))
1288 * probe for current path (from sysfs) and map (from dm) sets
1290 path_discovery(vecs->pathvec, conf, DI_ALL);
1292 vector_foreach_slot (vecs->pathvec, pp, i){
1293 if (filter_path(conf, pp) > 0){
1294 vector_del_slot(vecs->pathvec, i);
1299 pp->checkint = conf->checkint;
1301 if (map_discovery(vecs))
1305 * create new set of maps & push changed ones into dm
1307 if (coalesce_paths(vecs, mpvec, NULL, 1))
1311 * may need to remove some maps which are no longer relevant
1312 * e.g., due to blacklist changes in conf file
1314 if (coalesce_maps(vecs, mpvec))
1319 sync_maps_state(mpvec);
1322 * purge dm of old maps
1327 * save new set of maps formed by considering current path state
1329 vector_free(vecs->mpvec);
1330 vecs->mpvec = mpvec;
1333 * start dm event waiter threads for these new maps
1335 vector_foreach_slot(vecs->mpvec, mpp, i) {
1336 if (setup_multipath(vecs, mpp))
1339 if (start_waiter_thread(mpp, vecs))
1346 reconfigure (struct vectors * vecs)
1348 struct config * old = conf;
1352 * free old map and path vectors ... they use old conf state
1354 if (VECTOR_SIZE(vecs->mpvec))
1355 remove_maps_and_stop_waiters(vecs);
1357 if (VECTOR_SIZE(vecs->pathvec))
1358 free_pathvec(vecs->pathvec, FREE_PATHS);
1360 vecs->pathvec = NULL;
1363 if (!load_config(DEFAULT_CONFIGFILE)) {
1364 conf->verbosity = old->verbosity;
1374 static struct vectors *
1377 struct vectors * vecs;
1379 vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1385 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1387 if (!vecs->lock.mutex)
1390 pthread_mutex_init(vecs->lock.mutex, NULL);
1391 vecs->lock.depth = 0;
1397 condlog(0, "failed to init paths");
1402 signal_set(int signo, void (*func) (int))
1405 struct sigaction sig;
1406 struct sigaction osig;
1408 sig.sa_handler = func;
1409 sigemptyset(&sig.sa_mask);
1412 r = sigaction(signo, &sig, &osig);
1417 return (osig.sa_handler);
1423 condlog(2, "reconfigure (SIGHUP)");
1425 if (running_state != DAEMON_RUNNING)
1430 unlock(gvecs->lock);
1433 dbg_free_final(NULL);
1446 condlog(3, "SIGUSR1 received");
1452 signal_set(SIGHUP, sighup);
1453 signal_set(SIGUSR1, sigusr1);
1454 signal_set(SIGINT, sigend);
1455 signal_set(SIGTERM, sigend);
1456 signal(SIGPIPE, SIG_IGN);
1463 static struct sched_param sched_param = {
1464 .sched_priority = 99
1467 res = sched_setscheduler (0, SCHED_RR, &sched_param);
1470 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1478 char *file = "/proc/self/oom_score_adj";
1479 int score = OOM_SCORE_ADJ_MIN;
1484 if (stat(file, &st) == 0){
1485 fp = fopen(file, "w");
1487 condlog(0, "couldn't fopen %s : %s", file,
1491 fprintf(fp, "%i", score);
1495 if (errno != ENOENT) {
1496 condlog(0, "couldn't stat %s : %s", file,
1500 file = "/proc/self/oom_adj";
1501 score = OOM_ADJUST_MIN;
1503 condlog(0, "couldn't adjust oom score");
1507 child (void * param)
1509 pthread_t check_thr, uevent_thr, uxlsnr_thr, uevq_thr;
1510 pthread_attr_t log_attr, misc_attr;
1511 struct vectors * vecs;
1512 struct multipath * mpp;
1516 mlockall(MCL_CURRENT | MCL_FUTURE);
1518 setup_thread_attr(&misc_attr, 64 * 1024, 1);
1519 setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1522 setup_thread_attr(&log_attr, 64 * 1024, 0);
1523 log_thread_start(&log_attr);
1524 pthread_attr_destroy(&log_attr);
1527 running_state = DAEMON_START;
1529 condlog(2, "--------start up--------");
1530 condlog(2, "read " DEFAULT_CONFIGFILE);
1532 if (load_config(DEFAULT_CONFIGFILE))
1535 if (init_checkers()) {
1536 condlog(0, "failed to initialize checkers");
1540 condlog(0, "failed to initialize prioritizers");
1544 setlogmask(LOG_UPTO(conf->verbosity + 3));
1546 if (conf->max_fds) {
1547 struct rlimit fd_limit;
1549 if (getrlimit(RLIMIT_NOFILE, &fd_limit) < 0) {
1550 condlog(0, "can't get open fds limit: %s\n",
1552 fd_limit.rlim_cur = 0;
1553 fd_limit.rlim_max = 0;
1555 if (fd_limit.rlim_cur < conf->max_fds) {
1556 fd_limit.rlim_cur = conf->max_fds;
1557 if (fd_limit.rlim_max < conf->max_fds)
1558 fd_limit.rlim_max = conf->max_fds;
1559 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0) {
1560 condlog(0, "can't set open fds limit to "
1562 fd_limit.rlim_cur, fd_limit.rlim_max,
1565 condlog(3, "set open fds limit to %lu/%lu\n",
1566 fd_limit.rlim_cur, fd_limit.rlim_max);
1575 vecs = gvecs = init_vecs();
1580 if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1581 condlog(0, "can not find sysfs mount point");
1585 udev_set_sync_support(0);
1587 * Start uevent listener early to catch events
1589 if ((rc = pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs))) {
1590 condlog(0, "failed to create uevent thread: %d", rc);
1593 if ((rc = pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs))) {
1594 condlog(0, "failed to create cli listener: %d", rc);
1598 * fetch and configure both paths and multipaths
1601 running_state = DAEMON_CONFIGURE;
1603 if (configure(vecs, 1)) {
1605 condlog(0, "failure during configuration");
1613 if ((rc = pthread_create(&check_thr, &misc_attr, checkerloop, vecs))) {
1614 condlog(0,"failed to create checker loop thread: %d", rc);
1617 if ((rc = pthread_create(&uevq_thr, &misc_attr, uevqloop, vecs))) {
1618 condlog(0, "failed to create uevent dispatcher: %d", rc);
1621 pthread_attr_destroy(&misc_attr);
1623 pthread_mutex_lock(&exit_mutex);
1624 /* Startup complete, create logfile */
1625 if (pidfile_create(DEFAULT_PIDFILE, daemon_pid))
1626 /* Ignore errors, we can live without */
1627 condlog(1, "failed to create pidfile");
1629 running_state = DAEMON_RUNNING;
1630 pthread_cond_wait(&exit_cond, &exit_mutex);
1635 running_state = DAEMON_SHUTDOWN;
1636 block_signal(SIGHUP, NULL);
1638 if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF)
1639 vector_foreach_slot(vecs->mpvec, mpp, i)
1640 dm_queue_if_no_path(mpp->alias, 0);
1641 remove_maps_and_stop_waiters(vecs);
1644 pthread_cancel(check_thr);
1645 pthread_cancel(uevent_thr);
1646 pthread_cancel(uxlsnr_thr);
1647 pthread_cancel(uevq_thr);
1652 free_pathvec(vecs->pathvec, FREE_PATHS);
1653 vecs->pathvec = NULL;
1655 /* Now all the waitevent threads will start rushing in. */
1656 while (vecs->lock.depth > 0) {
1657 sleep (1); /* This is weak. */
1658 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1660 pthread_mutex_destroy(vecs->lock.mutex);
1661 FREE(vecs->lock.mutex);
1662 vecs->lock.depth = 0;
1663 vecs->lock.mutex = NULL;
1673 /* We're done here */
1674 condlog(3, "unlink pidfile");
1675 unlink(DEFAULT_PIDFILE);
1677 condlog(2, "--------shut down-------");
1683 * Freeing config must be done after condlog() and dm_lib_exit(),
1684 * because logging functions like dlog() and dm_write_log()
1685 * reference the config.
1691 dbg_free_final(NULL);
1703 if( (pid = fork()) < 0){
1704 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1712 if ( (pid = fork()) < 0)
1713 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1718 fprintf(stderr, "cannot chdir to '/', continuing\n");
1720 dev_null_fd = open("/dev/null", O_RDWR);
1721 if (dev_null_fd < 0){
1722 fprintf(stderr, "cannot open /dev/null for input & output : %s\n",
1727 close(STDIN_FILENO);
1729 close(STDOUT_FILENO);
1731 close(STDERR_FILENO);
1734 daemon_pid = getpid();
1739 main (int argc, char *argv[])
1741 extern char *optarg;
1747 running_state = DAEMON_INIT;
1750 if (getuid() != 0) {
1751 fprintf(stderr, "need to be root\n");
1755 /* make sure we don't lock any path */
1757 umask(umask(077) | 022);
1759 conf = alloc_config();
1764 while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1768 //debug=1; /* ### comment me out ### */
1771 if (sizeof(optarg) > sizeof(char *) ||
1772 !isdigit(optarg[0]))
1775 conf->verbosity = atoi(optarg);
1784 if (optind < argc) {
1789 while (optind < argc) {
1790 if (strchr(argv[optind], ' '))
1791 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1793 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1796 c += snprintf(c, s + CMDSIZE - c, "\n");
1814 return (child(NULL));