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>
58 #include "cli_handlers.h"
62 #define FILE_NAME_SIZE 256
65 #define LOG_MSG(a,b) \
66 if (strlen(b)) condlog(a, "%s: %s - %s", pp->mpp->alias, pp->dev, b);
68 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
69 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
72 enum daemon_status running_state;
76 * global copy of vecs for use in sig handlers
78 struct vectors * gvecs;
81 need_switch_pathgroup (struct multipath * mpp, int refresh)
83 struct pathgroup * pgp;
87 if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
91 * Refresh path priority values
94 vector_foreach_slot (mpp->pg, pgp, i)
95 vector_foreach_slot (pgp->paths, pp, j)
96 pathinfo(pp, conf->hwtable, DI_PRIO);
98 mpp->bestpg = select_path_group(mpp);
100 if (mpp->bestpg != mpp->nextpg)
107 switch_pathgroup (struct multipath * mpp)
109 mpp->stat_switchgroup++;
110 dm_switchgroup(mpp->alias, mpp->bestpg);
111 condlog(2, "%s: switch to path group #%i",
112 mpp->alias, mpp->bestpg);
116 coalesce_maps(struct vectors *vecs, vector nmpv)
118 struct multipath * ompp;
119 vector ompv = vecs->mpvec;
123 vector_foreach_slot (ompv, ompp, i) {
124 if (!find_mp_by_wwid(nmpv, ompp->wwid)) {
126 * remove all current maps not allowed by the
127 * current configuration
129 if (dm_flush_map(ompp->alias)) {
130 condlog(0, "%s: unable to flush devmap",
133 * may be just because the device is open
135 if (!vector_alloc_slot(nmpv))
138 vector_set_slot(nmpv, ompp);
139 setup_multipath(vecs, ompp);
141 if ((j = find_slot(ompv, (void *)ompp)) != -1)
142 vector_del_slot(ompv, j);
148 condlog(2, "%s devmap removed", ompp->alias);
150 } else if (conf->reassign_maps) {
151 condlog(3, "%s: Reassign existing device-mapper"
152 " devices", ompp->alias);
153 dm_reassign(ompp->alias);
160 sync_map_state(struct multipath *mpp)
162 struct pathgroup *pgp;
169 vector_foreach_slot (mpp->pg, pgp, i){
170 vector_foreach_slot (pgp->paths, pp, j){
171 if (pp->state == PATH_UNCHECKED ||
172 pp->state == PATH_WILD)
174 if ((pp->dmstate == PSTATE_FAILED ||
175 pp->dmstate == PSTATE_UNDEF) &&
176 (pp->state == PATH_UP || pp->state == PATH_GHOST))
177 dm_reinstate_path(mpp->alias, pp->dev_t);
178 else if ((pp->dmstate == PSTATE_ACTIVE ||
179 pp->dmstate == PSTATE_UNDEF) &&
180 (pp->state == PATH_DOWN ||
181 pp->state == PATH_SHAKY))
182 dm_fail_path(mpp->alias, pp->dev_t);
188 sync_maps_state(vector mpvec)
191 struct multipath *mpp;
193 vector_foreach_slot (mpvec, mpp, i)
198 flush_map(struct multipath * mpp, struct vectors * vecs)
201 * clear references to this map before flushing so we can ignore
202 * the spurious uevent we may generate with the dm_flush_map call below
204 if (dm_flush_map(mpp->alias)) {
206 * May not really be an error -- if the map was already flushed
207 * from the device mapper by dmsetup(8) for instance.
209 condlog(0, "%s: can't flush", mpp->alias);
214 condlog(2, "%s: devmap removed", mpp->alias);
217 orphan_paths(vecs->pathvec, mpp);
218 remove_map_and_stop_waiter(mpp, vecs, 1);
224 uev_add_map (struct uevent * uev, struct vectors * vecs)
227 int major = -1, minor = -1, rc;
229 condlog(2, "%s: add map (uevent)", uev->kernel);
230 alias = uevent_get_dm_name(uev);
232 condlog(3, "%s: No DM_NAME in uevent", uev->kernel);
233 major = uevent_get_major(uev);
234 minor = uevent_get_minor(uev);
235 alias = dm_mapname(major, minor);
237 condlog(2, "%s: mapname not found for %d:%d",
238 uev->kernel, major, minor);
242 rc = ev_add_map(uev->kernel, alias, vecs);
248 ev_add_map (char * dev, char * alias, struct vectors * vecs)
251 struct multipath * mpp;
255 map_present = dm_map_present(alias);
257 if (map_present && dm_type(alias, TGT_MPATH) <= 0) {
258 condlog(4, "%s: not a multipath map", alias);
262 mpp = find_mp_by_alias(vecs->mpvec, alias);
266 * Not really an error -- we generate our own uevent
267 * if we create a multipath mapped device as a result
270 if (conf->reassign_maps) {
271 condlog(3, "%s: Reassign existing device-mapper devices",
279 * now we can register the map
281 if (map_present && (mpp = add_map_without_path(vecs, alias))) {
283 condlog(2, "%s: devmap %s registered", alias, dev);
286 refwwid = get_refwwid(dev, DEV_DEVMAP, vecs->pathvec);
289 r = coalesce_paths(vecs, NULL, refwwid, 0);
294 condlog(2, "%s: devmap %s added", alias, dev);
296 condlog(0, "%s: uev_add_map %s failed", alias, dev);
303 uev_remove_map (struct uevent * uev, struct vectors * vecs)
308 condlog(2, "%s: remove map (uevent)", uev->kernel);
309 alias = uevent_get_dm_name(uev);
311 condlog(3, "%s: No DM_NAME in uevent, ignoring", uev->kernel);
314 minor = uevent_get_minor(uev);
315 rc = ev_remove_map(uev->kernel, alias, minor, vecs);
321 ev_remove_map (char * devname, char * alias, int minor, struct vectors * vecs)
323 struct multipath * mpp;
325 mpp = find_mp_by_minor(vecs->mpvec, minor);
328 condlog(2, "%s: devmap not registered, can't remove",
332 if (strcmp(mpp->alias, alias)) {
333 condlog(2, "%s: minor number mismatch (map %d, event %d)",
334 mpp->alias, mpp->dmi->minor, minor);
337 return flush_map(mpp, vecs);
341 uev_add_path (struct uevent *uev, struct vectors * vecs)
343 struct sysfs_device * dev;
345 dev = sysfs_device_get(uev->devpath);
347 condlog(2, "%s: not found in sysfs", uev->devpath);
350 condlog(2, "%s: add path (uevent)", dev->kernel);
351 return (ev_add_path(dev->kernel, vecs) != 1)? 0 : 1;
361 ev_add_path (char * devname, struct vectors * vecs)
363 struct multipath * mpp;
365 char empty_buff[WWID_SIZE] = {0};
366 char params[PARAMS_SIZE] = {0};
367 int start_waiter = 0;
369 if (strstr(devname, "..") != NULL) {
371 * Don't allow relative device names in the pathvec
373 condlog(0, "%s: path name is invalid", devname);
377 pp = find_path_by_dev(vecs->pathvec, devname);
380 condlog(0, "%s: spurious uevent, path already in pathvec",
387 * get path vital state
389 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
391 condlog(0, "%s: failed to store path info", devname);
394 pp->checkint = conf->checkint;
398 * need path UID to go any further
400 if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
401 condlog(0, "%s: failed to get path uid", devname);
402 goto fail; /* leave path added to pathvec */
404 if (filter_path(conf, pp) > 0){
405 int i = find_slot(vecs->pathvec, (void *)pp);
407 vector_del_slot(vecs->pathvec, i);
411 mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
414 if ((!pp->size) || (mpp->size != pp->size)) {
416 condlog(0, "%s: failed to add new path %s, "
420 condlog(0, "%s: failed to add new path %s, "
421 "device size mismatch",
423 int i = find_slot(vecs->pathvec, (void *)pp);
425 vector_del_slot(vecs->pathvec, i);
430 condlog(4,"%s: adopting all paths for path %s",
431 mpp->alias, pp->dev);
432 if (adopt_paths(vecs->pathvec, mpp, 1))
433 goto fail; /* leave path added to pathvec */
435 verify_paths(mpp, vecs, NULL);
436 mpp->flush_on_last_del = FLUSH_UNDEF;
437 mpp->action = ACT_RELOAD;
441 condlog(0, "%s: failed to create new map,"
442 " %s device size is 0 ", devname, pp->dev);
443 int i = find_slot(vecs->pathvec, (void *)pp);
445 vector_del_slot(vecs->pathvec, i);
450 condlog(4,"%s: creating new map", pp->dev);
451 if ((mpp = add_map_with_path(vecs, pp, 1))) {
452 mpp->action = ACT_CREATE;
454 * We don't depend on ACT_CREATE, as domap will
455 * set it to ACT_NOTHING when complete.
460 goto fail; /* leave path added to pathvec */
464 * push the map to the device-mapper
466 if (setup_map(mpp, params, PARAMS_SIZE)) {
467 condlog(0, "%s: failed to setup map for addition of new "
468 "path %s", mpp->alias, devname);
472 * reload the map for the multipath mapped device
474 if (domap(mpp, params) <= 0) {
475 condlog(0, "%s: failed in domap for addition of new "
476 "path %s", mpp->alias, devname);
478 * deal with asynchronous uevents :((
480 if (mpp->action == ACT_RELOAD) {
481 condlog(0, "%s: uev_add_path sleep", mpp->alias);
483 update_mpp_paths(mpp, vecs->pathvec);
492 * update our state from kernel regardless of create or reload
494 if (setup_multipath(vecs, mpp))
499 if ((mpp->action == ACT_CREATE ||
500 (mpp->action == ACT_NOTHING && start_waiter && !mpp->waiter)) &&
501 start_waiter_thread(mpp, vecs))
504 condlog(2, "%s path added to devmap %s", devname, mpp->alias);
508 remove_map(mpp, vecs, 1);
515 uev_remove_path (struct uevent *uev, struct vectors * vecs)
517 struct sysfs_device * dev;
520 dev = sysfs_device_get(uev->devpath);
522 condlog(2, "%s: not found in sysfs", uev->devpath);
525 condlog(2, "%s: remove path (uevent)", uev->kernel);
526 retval = ev_remove_path(uev->kernel, vecs);
529 sysfs_device_put(dev);
535 ev_remove_path (char * devname, struct vectors * vecs)
537 struct multipath * mpp;
540 char params[PARAMS_SIZE] = {0};
542 pp = find_path_by_dev(vecs->pathvec, devname);
545 /* Not an error; path might have been purged earlier */
546 condlog(0, "%s: path already removed", devname);
551 * avoid referring to the map of an orphaned path
553 if ((mpp = pp->mpp)) {
555 * transform the mp->pg vector of vectors of paths
556 * into a mp->params string to feed the device-mapper
558 if (update_mpp_paths(mpp, vecs->pathvec)) {
559 condlog(0, "%s: failed to update paths",
563 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
564 vector_del_slot(mpp->paths, i);
567 * remove the map IFF removing the last path
569 if (VECTOR_SIZE(mpp->paths) == 0) {
570 char alias[WWID_SIZE];
573 * flush_map will fail if the device is open
575 strncpy(alias, mpp->alias, WWID_SIZE);
576 if (mpp->flush_on_last_del == FLUSH_ENABLED) {
577 condlog(2, "%s Last path deleted, disabling queueing", mpp->alias);
579 mpp->no_path_retry = NO_PATH_RETRY_FAIL;
580 mpp->flush_on_last_del = FLUSH_IN_PROGRESS;
581 dm_queue_if_no_path(mpp->alias, 0);
583 if (!flush_map(mpp, vecs)) {
584 condlog(2, "%s: removed map after"
585 " removing all paths",
591 * Not an error, continue
595 if (setup_map(mpp, params, PARAMS_SIZE)) {
596 condlog(0, "%s: failed to setup map for"
597 " removal of path %s", mpp->alias,
604 mpp->action = ACT_RELOAD;
605 if (domap(mpp, params) <= 0) {
606 condlog(0, "%s: failed in domap for "
607 "removal of path %s",
608 mpp->alias, devname);
612 * update our state from kernel
614 if (setup_multipath(vecs, mpp)) {
619 condlog(2, "%s: path removed from map %s",
620 devname, mpp->alias);
625 if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
626 vector_del_slot(vecs->pathvec, i);
633 remove_map_and_stop_waiter(mpp, vecs, 1);
638 uev_update_path (struct uevent *uev, struct vectors * vecs)
640 struct sysfs_device * dev;
643 dev = sysfs_device_get(uev->devpath);
645 condlog(2, "%s: not found in sysfs", uev->devpath);
648 ro = uevent_get_disk_ro(uev);
653 condlog(2, "%s: update path write_protect to '%d' (uevent)",
655 pp = find_path_by_dev(vecs->pathvec, uev->kernel);
657 condlog(0, "%s: spurious uevent, path not found",
662 retval = reload_map(vecs, pp->mpp);
664 condlog(2, "%s: map %s reloaded (retval %d)",
665 uev->kernel, pp->mpp->alias, retval);
669 sysfs_device_put(dev);
675 map_discovery (struct vectors * vecs)
677 struct multipath * mpp;
680 if (dm_get_maps(vecs->mpvec))
683 vector_foreach_slot (vecs->mpvec, mpp, i)
684 if (setup_multipath(vecs, mpp))
691 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
693 struct vectors * vecs;
698 vecs = (struct vectors *)trigger_data;
700 pthread_cleanup_push(cleanup_lock, &vecs->lock);
703 r = parse_cmd(str, reply, len, vecs);
706 *reply = STRDUP("fail\n");
707 *len = strlen(*reply) + 1;
710 else if (!r && *len == 0) {
711 *reply = STRDUP("ok\n");
712 *len = strlen(*reply) + 1;
715 /* else if (r < 0) leave *reply alone */
717 lock_cleanup_pop(vecs->lock);
722 uev_discard(char * devpath)
728 * keep only block devices, discard partitions
730 tmp = strstr(devpath, "/block/");
732 condlog(4, "no /block/ in '%s'", devpath);
735 if (sscanf(tmp, "/block/%10s", a) != 1 ||
736 sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
737 condlog(4, "discard event on %s", devpath);
744 uev_trigger (struct uevent * uev, void * trigger_data)
747 struct vectors * vecs;
749 vecs = (struct vectors *)trigger_data;
751 if (uev_discard(uev->devpath))
758 * Add events are ignored here as the tables
759 * are not fully initialised then.
761 if (!strncmp(uev->kernel, "dm-", 3)) {
762 if (!strncmp(uev->action, "change", 6)) {
763 r = uev_add_map(uev, vecs);
766 if (!strncmp(uev->action, "remove", 6)) {
767 r = uev_remove_map(uev, vecs);
774 * path add/remove event
776 if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
780 if (!strncmp(uev->action, "add", 3)) {
781 r = uev_add_path(uev, vecs);
784 if (!strncmp(uev->action, "remove", 6)) {
785 r = uev_remove_path(uev, vecs);
788 if (!strncmp(uev->action, "change", 6)) {
789 r = uev_update_path(uev, vecs);
799 ueventloop (void * ap)
801 block_signal(SIGUSR1, NULL);
802 block_signal(SIGHUP, NULL);
805 condlog(0, "error starting uevent listener");
813 block_signal(SIGUSR1, NULL);
814 block_signal(SIGHUP, NULL);
816 if (uevent_dispatch(&uev_trigger, ap))
817 condlog(0, "error starting uevent dispatcher");
822 uxlsnrloop (void * ap)
824 block_signal(SIGUSR1, NULL);
825 block_signal(SIGHUP, NULL);
830 set_handler_callback(LIST+PATHS, cli_list_paths);
831 set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
832 set_handler_callback(LIST+MAPS, cli_list_maps);
833 set_handler_callback(LIST+STATUS, cli_list_status);
834 set_handler_callback(LIST+DAEMON, cli_list_daemon);
835 set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
836 set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
837 set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
838 set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
839 set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
840 set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
841 set_handler_callback(LIST+CONFIG, cli_list_config);
842 set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
843 set_handler_callback(LIST+DEVICES, cli_list_devices);
844 set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
845 set_handler_callback(ADD+PATH, cli_add_path);
846 set_handler_callback(DEL+PATH, cli_del_path);
847 set_handler_callback(ADD+MAP, cli_add_map);
848 set_handler_callback(DEL+MAP, cli_del_map);
849 set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
850 set_handler_callback(RECONFIGURE, cli_reconfigure);
851 set_handler_callback(SUSPEND+MAP, cli_suspend);
852 set_handler_callback(RESUME+MAP, cli_resume);
853 set_handler_callback(RESIZE+MAP, cli_resize);
854 set_handler_callback(RELOAD+MAP, cli_reload);
855 set_handler_callback(RESET+MAP, cli_reassign);
856 set_handler_callback(REINSTATE+PATH, cli_reinstate);
857 set_handler_callback(FAIL+PATH, cli_fail);
858 set_handler_callback(DISABLEQ+MAP, cli_disable_queueing);
859 set_handler_callback(RESTOREQ+MAP, cli_restore_queueing);
860 set_handler_callback(DISABLEQ+MAPS, cli_disable_all_queueing);
861 set_handler_callback(RESTOREQ+MAPS, cli_restore_all_queueing);
862 set_handler_callback(QUIT, cli_quit);
863 set_handler_callback(SHUTDOWN, cli_shutdown);
866 uxsock_listen(&uxsock_trigger, ap);
872 exit_daemon (int status)
875 fprintf(stderr, "bad exit status. see daemon.log\n");
877 condlog(3, "unlink pidfile");
878 unlink(DEFAULT_PIDFILE);
880 pthread_mutex_lock(&exit_mutex);
881 pthread_cond_signal(&exit_cond);
882 pthread_mutex_unlock(&exit_mutex);
890 switch (running_state) {
895 case DAEMON_CONFIGURE:
899 case DAEMON_SHUTDOWN:
906 fail_path (struct path * pp, int del_active)
911 condlog(2, "checker failed path %s in map %s",
912 pp->dev_t, pp->mpp->alias);
914 dm_fail_path(pp->mpp->alias, pp->dev_t);
916 update_queue_mode_del_path(pp->mpp);
920 * caller must have locked the path list before calling that function
923 reinstate_path (struct path * pp, int add_active)
928 if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
929 condlog(0, "%s: reinstate failed", pp->dev_t);
931 condlog(2, "%s: reinstated", pp->dev_t);
933 update_queue_mode_add_path(pp->mpp);
938 enable_group(struct path * pp)
940 struct pathgroup * pgp;
943 * if path is added through uev_add_path, pgindex can be unset.
944 * next update_strings() will set it, upon map reload event.
946 * we can safely return here, because upon map reload, all
947 * PG will be enabled.
949 if (!pp->mpp->pg || !pp->pgindex)
952 pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
954 if (pgp->status == PGSTATE_DISABLED) {
955 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
956 dm_enablegroup(pp->mpp->alias, pp->pgindex);
961 mpvec_garbage_collector (struct vectors * vecs)
963 struct multipath * mpp;
969 vector_foreach_slot (vecs->mpvec, mpp, i) {
970 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
971 condlog(2, "%s: remove dead map", mpp->alias);
972 remove_map_and_stop_waiter(mpp, vecs, 1);
979 defered_failback_tick (vector mpvec)
981 struct multipath * mpp;
984 vector_foreach_slot (mpvec, mpp, i) {
986 * defered failback getting sooner
988 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
989 mpp->failback_tick--;
991 if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
992 switch_pathgroup(mpp);
998 retry_count_tick(vector mpvec)
1000 struct multipath *mpp;
1003 vector_foreach_slot (mpvec, mpp, i) {
1004 if (mpp->retry_tick) {
1005 mpp->stat_total_queueing_time++;
1006 condlog(4, "%s: Retrying.. No active path", mpp->alias);
1007 if(--mpp->retry_tick == 0) {
1008 dm_queue_if_no_path(mpp->alias, 0);
1009 condlog(2, "%s: Disable queueing", mpp->alias);
1015 int update_prio(struct path *pp, int refresh_all)
1019 struct pathgroup * pgp;
1020 int i, j, changed = 0;
1023 vector_foreach_slot (pp->mpp->pg, pgp, i) {
1024 vector_foreach_slot (pgp->paths, pp1, j) {
1025 oldpriority = pp1->priority;
1026 pathinfo(pp1, conf->hwtable, DI_PRIO);
1027 if (pp1->priority != oldpriority)
1033 oldpriority = pp->priority;
1034 pathinfo(pp, conf->hwtable, DI_PRIO);
1036 if (pp->priority == oldpriority)
1041 int update_path_groups(struct multipath *mpp, struct vectors *vecs, int refresh)
1045 char params[PARAMS_SIZE];
1047 update_mpp_paths(mpp, vecs->pathvec);
1049 vector_foreach_slot (mpp->paths, pp, i)
1050 pathinfo(pp, conf->hwtable, DI_PRIO);
1053 if (setup_map(mpp, params, PARAMS_SIZE))
1056 mpp->action = ACT_RELOAD;
1057 if (domap(mpp, params) <= 0) {
1058 condlog(0, "%s: failed to update map : %s", mpp->alias,
1063 setup_multipath(vecs, mpp);
1064 sync_map_state(mpp);
1070 check_path (struct vectors * vecs, struct path * pp)
1073 int new_path_up = 0;
1078 if (pp->tick && --pp->tick)
1079 return; /* don't check this path yet */
1082 * provision a next check soonest,
1083 * in case we exit abnormaly from here
1085 pp->tick = conf->checkint;
1087 newstate = path_offline(pp);
1088 if (newstate == PATH_UP)
1089 newstate = get_state(pp, 1);
1091 if (newstate == PATH_WILD || newstate == PATH_UNCHECKED) {
1092 condlog(2, "%s: unusable path", pp->dev);
1093 pathinfo(pp, conf->hwtable, 0);
1097 * Async IO in flight. Keep the previous path state
1098 * and reschedule as soon as possible
1100 if (newstate == PATH_PENDING) {
1105 * Synchronize with kernel state
1107 if (update_multipath_strings(pp->mpp, vecs->pathvec)) {
1108 condlog(1, "%s: Could not synchronize with kernel state\n",
1110 pp->dmstate = PSTATE_UNDEF;
1112 if (newstate != pp->state) {
1113 int oldstate = pp->state;
1114 pp->state = newstate;
1115 LOG_MSG(1, checker_message(&pp->checker));
1118 * upon state change, reset the checkint
1119 * to the shortest delay
1121 pp->checkint = conf->checkint;
1123 if (newstate == PATH_DOWN || newstate == PATH_SHAKY) {
1125 * proactively fail path in the DM
1127 if (oldstate == PATH_UP ||
1128 oldstate == PATH_GHOST)
1134 * cancel scheduled failback
1136 pp->mpp->failback_tick = 0;
1138 pp->mpp->stat_path_failures++;
1143 * reinstate this path
1145 if (oldstate != PATH_UP &&
1146 oldstate != PATH_GHOST)
1147 reinstate_path(pp, 1);
1149 reinstate_path(pp, 0);
1154 * if at least one path is up in a group, and
1155 * the group is disabled, re-enable it
1157 if (newstate == PATH_UP)
1160 else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1161 if (pp->dmstate == PSTATE_FAILED ||
1162 pp->dmstate == PSTATE_UNDEF) {
1163 /* Clear IO errors */
1164 reinstate_path(pp, 0);
1166 LOG_MSG(4, checker_message(&pp->checker));
1168 * double the next check delay.
1169 * max at conf->max_checkint
1171 if (pp->checkint < (conf->max_checkint / 2))
1172 pp->checkint = 2 * pp->checkint;
1174 pp->checkint = conf->max_checkint;
1176 pp->tick = pp->checkint;
1177 condlog(4, "%s: delay next check %is",
1178 pp->dev_t, pp->tick);
1181 else if (newstate == PATH_DOWN)
1182 LOG_MSG(2, checker_message(&pp->checker));
1184 pp->state = newstate;
1187 * path prio refreshing
1189 condlog(4, "path prio refresh");
1191 if (update_prio(pp, new_path_up) &&
1192 pp->mpp->pgpolicyfn == (pgpolicyfn *)group_by_prio)
1193 update_path_groups(pp->mpp, vecs, !new_path_up);
1194 else if (need_switch_pathgroup(pp->mpp, 0)) {
1195 if (pp->mpp->pgfailback > 0 &&
1196 (new_path_up || pp->mpp->failback_tick <= 0))
1197 pp->mpp->failback_tick =
1198 pp->mpp->pgfailback + 1;
1199 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE)
1200 switch_pathgroup(pp->mpp);
1205 checkerloop (void *ap)
1207 struct vectors *vecs;
1213 mlockall(MCL_CURRENT | MCL_FUTURE);
1214 vecs = (struct vectors *)ap;
1215 condlog(2, "path checkers start up");
1218 * init the path check interval
1220 vector_foreach_slot (vecs->pathvec, pp, i) {
1221 pp->checkint = conf->checkint;
1225 block_signal(SIGHUP, &old);
1226 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1230 if (vecs->pathvec) {
1231 vector_foreach_slot (vecs->pathvec, pp, i) {
1232 check_path(vecs, pp);
1236 defered_failback_tick(vecs->mpvec);
1237 retry_count_tick(vecs->mpvec);
1242 condlog(4, "map garbage collection");
1243 mpvec_garbage_collector(vecs);
1247 lock_cleanup_pop(vecs->lock);
1248 pthread_sigmask(SIG_SETMASK, &old, NULL);
1255 configure (struct vectors * vecs, int start_waiters)
1257 struct multipath * mpp;
1262 if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1265 if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1268 if (!(mpvec = vector_alloc()))
1272 * probe for current path (from sysfs) and map (from dm) sets
1274 path_discovery(vecs->pathvec, conf, DI_ALL);
1276 vector_foreach_slot (vecs->pathvec, pp, i){
1277 if (filter_path(conf, pp) > 0){
1278 vector_del_slot(vecs->pathvec, i);
1283 pp->checkint = conf->checkint;
1285 if (map_discovery(vecs))
1289 * create new set of maps & push changed ones into dm
1291 if (coalesce_paths(vecs, mpvec, NULL, 1))
1295 * may need to remove some maps which are no longer relevant
1296 * e.g., due to blacklist changes in conf file
1298 if (coalesce_maps(vecs, mpvec))
1303 sync_maps_state(mpvec);
1306 * purge dm of old maps
1311 * save new set of maps formed by considering current path state
1313 vector_free(vecs->mpvec);
1314 vecs->mpvec = mpvec;
1317 * start dm event waiter threads for these new maps
1319 vector_foreach_slot(vecs->mpvec, mpp, i) {
1320 if (setup_multipath(vecs, mpp))
1323 if (start_waiter_thread(mpp, vecs))
1330 reconfigure (struct vectors * vecs)
1332 struct config * old = conf;
1336 * free old map and path vectors ... they use old conf state
1338 if (VECTOR_SIZE(vecs->mpvec))
1339 remove_maps_and_stop_waiters(vecs);
1341 if (VECTOR_SIZE(vecs->pathvec))
1342 free_pathvec(vecs->pathvec, FREE_PATHS);
1344 vecs->pathvec = NULL;
1347 if (!load_config(DEFAULT_CONFIGFILE)) {
1348 conf->verbosity = old->verbosity;
1358 static struct vectors *
1361 struct vectors * vecs;
1363 vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1369 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1371 if (!vecs->lock.mutex)
1374 pthread_mutex_init(vecs->lock.mutex, NULL);
1375 vecs->lock.depth = 0;
1381 condlog(0, "failed to init paths");
1386 signal_set(int signo, void (*func) (int))
1389 struct sigaction sig;
1390 struct sigaction osig;
1392 sig.sa_handler = func;
1393 sigemptyset(&sig.sa_mask);
1396 r = sigaction(signo, &sig, &osig);
1401 return (osig.sa_handler);
1407 condlog(2, "reconfigure (SIGHUP)");
1409 if (running_state != DAEMON_RUNNING)
1414 unlock(gvecs->lock);
1417 dbg_free_final(NULL);
1430 condlog(3, "SIGUSR1 received");
1436 signal_set(SIGHUP, sighup);
1437 signal_set(SIGUSR1, sigusr1);
1438 signal_set(SIGINT, sigend);
1439 signal_set(SIGTERM, sigend);
1440 signal(SIGPIPE, SIG_IGN);
1447 static struct sched_param sched_param = {
1448 .sched_priority = 99
1451 res = sched_setscheduler (0, SCHED_RR, &sched_param);
1454 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1459 set_oom_adj (int val)
1463 fp = fopen("/proc/self/oom_adj", "w");
1468 fprintf(fp, "%i", val);
1473 child (void * param)
1475 pthread_t check_thr, uevent_thr, uxlsnr_thr, uevq_thr;
1476 pthread_attr_t log_attr, misc_attr;
1477 struct vectors * vecs;
1478 struct multipath * mpp;
1482 mlockall(MCL_CURRENT | MCL_FUTURE);
1484 setup_thread_attr(&misc_attr, 64 * 1024, 1);
1485 setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1488 setup_thread_attr(&log_attr, 64 * 1024, 0);
1489 log_thread_start(&log_attr);
1490 pthread_attr_destroy(&log_attr);
1493 running_state = DAEMON_START;
1495 condlog(2, "--------start up--------");
1496 condlog(2, "read " DEFAULT_CONFIGFILE);
1498 if (load_config(DEFAULT_CONFIGFILE))
1501 if (init_checkers()) {
1502 condlog(0, "failed to initialize checkers");
1506 condlog(0, "failed to initialize prioritizers");
1510 setlogmask(LOG_UPTO(conf->verbosity + 3));
1513 * fill the voids left in the config file
1515 if (!conf->checkint) {
1516 conf->checkint = DEFAULT_CHECKINT;
1517 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1520 if (conf->max_fds) {
1521 struct rlimit fd_limit;
1523 if (getrlimit(RLIMIT_NOFILE, &fd_limit) < 0) {
1524 condlog(0, "can't get open fds limit: %s\n",
1526 fd_limit.rlim_cur = 0;
1527 fd_limit.rlim_max = 0;
1529 if (fd_limit.rlim_cur < conf->max_fds) {
1530 fd_limit.rlim_cur = conf->max_fds;
1531 if (fd_limit.rlim_max < conf->max_fds)
1532 fd_limit.rlim_max = conf->max_fds;
1533 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0) {
1534 condlog(0, "can't set open fds limit to "
1536 fd_limit.rlim_cur, fd_limit.rlim_max,
1539 condlog(3, "set open fds limit to %lu/%lu\n",
1540 fd_limit.rlim_cur, fd_limit.rlim_max);
1549 vecs = gvecs = init_vecs();
1554 if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1555 condlog(0, "can not find sysfs mount point");
1559 udev_set_sync_support(0);
1561 * Start uevent listener early to catch events
1563 if ((rc = pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs))) {
1564 condlog(0, "failed to create uevent thread: %d", rc);
1567 if ((rc = pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs))) {
1568 condlog(0, "failed to create cli listener: %d", rc);
1572 * fetch and configure both paths and multipaths
1575 running_state = DAEMON_CONFIGURE;
1577 if (configure(vecs, 1)) {
1579 condlog(0, "failure during configuration");
1587 if ((rc = pthread_create(&check_thr, &misc_attr, checkerloop, vecs))) {
1588 condlog(0,"failed to create checker loop thread: %d", rc);
1591 if ((rc = pthread_create(&uevq_thr, &misc_attr, uevqloop, vecs))) {
1592 condlog(0, "failed to create uevent dispatcher: %d", rc);
1595 pthread_attr_destroy(&misc_attr);
1597 pthread_mutex_lock(&exit_mutex);
1598 /* Startup complete, create logfile */
1599 if (pidfile_create(DEFAULT_PIDFILE, daemon_pid))
1600 /* Ignore errors, we can live without */
1601 condlog(1, "failed to create pidfile");
1603 running_state = DAEMON_RUNNING;
1604 pthread_cond_wait(&exit_cond, &exit_mutex);
1609 running_state = DAEMON_SHUTDOWN;
1610 block_signal(SIGHUP, NULL);
1612 if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF)
1613 vector_foreach_slot(vecs->mpvec, mpp, i)
1614 dm_queue_if_no_path(mpp->alias, 0);
1615 remove_maps_and_stop_waiters(vecs);
1618 pthread_cancel(check_thr);
1619 pthread_cancel(uevent_thr);
1620 pthread_cancel(uxlsnr_thr);
1621 pthread_cancel(uevq_thr);
1626 free_pathvec(vecs->pathvec, FREE_PATHS);
1627 vecs->pathvec = NULL;
1629 /* Now all the waitevent threads will start rushing in. */
1630 while (vecs->lock.depth > 0) {
1631 sleep (1); /* This is weak. */
1632 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1634 pthread_mutex_destroy(vecs->lock.mutex);
1635 FREE(vecs->lock.mutex);
1636 vecs->lock.depth = 0;
1637 vecs->lock.mutex = NULL;
1647 /* We're done here */
1648 condlog(3, "unlink pidfile");
1649 unlink(DEFAULT_PIDFILE);
1651 condlog(2, "--------shut down-------");
1657 * Freeing config must be done after condlog() and dm_lib_exit(),
1658 * because logging functions like dlog() and dm_write_log()
1659 * reference the config.
1665 dbg_free_final(NULL);
1677 if( (pid = fork()) < 0){
1678 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1686 if ( (pid = fork()) < 0)
1687 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1692 fprintf(stderr, "cannot chdir to '/', continuing\n");
1694 dev_null_fd = open("/dev/null", O_RDWR);
1695 if (dev_null_fd < 0){
1696 fprintf(stderr, "cannot open /dev/null for input & output : %s\n",
1701 close(STDIN_FILENO);
1703 close(STDOUT_FILENO);
1705 close(STDERR_FILENO);
1708 daemon_pid = getpid();
1713 main (int argc, char *argv[])
1715 extern char *optarg;
1721 running_state = DAEMON_INIT;
1724 if (getuid() != 0) {
1725 fprintf(stderr, "need to be root\n");
1729 /* make sure we don't lock any path */
1731 umask(umask(077) | 022);
1733 conf = alloc_config();
1738 while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1742 //debug=1; /* ### comment me out ### */
1745 if (sizeof(optarg) > sizeof(char *) ||
1746 !isdigit(optarg[0]))
1749 conf->verbosity = atoi(optarg);
1758 if (optind < argc) {
1763 while (optind < argc) {
1764 if (strchr(argv[optind], ' '))
1765 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1767 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1770 c += snprintf(c, s + CMDSIZE - c, "\n");
1788 return (child(NULL));