2 * snippets copied from device-mapper dmsetup.c
3 * Copyright (c) 2004, 2005 Christophe Varoqui
4 * Copyright (c) 2005 Kiyoshi Ueda, NEC
5 * Copyright (c) 2005 Patrick Caulfield, Redhat
11 #include <libdevmapper.h>
21 #include "devmapper.h"
24 #include "log_pthread.h"
25 #include <sys/types.h>
29 #define LOOPS_PER_SEC 5
31 #define UUID_PREFIX "mpath-"
32 #define UUID_PREFIX_LEN 6
35 dm_write_log (int level, const char *file, int line, const char *f, ...)
43 thres = (conf) ? conf->verbosity : 0;
44 if (thres <= 3 || level > thres)
49 time_t t = time(NULL);
50 struct tm *tb = localtime(&t);
53 strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
54 buff[sizeof(buff)-1] = '\0';
56 fprintf(stdout, "%s | ", buff);
57 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
58 vfprintf(stdout, f, ap);
59 fprintf(stdout, "\n");
61 condlog(level, "libdevmapper: %s(%i): ", file, line);
62 log_safe(level + 3, f, ap);
71 dm_log_init(&dm_write_log);
72 dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
80 int minv[3] = {1, 2, 8};
82 dm_get_library_version(version, sizeof(version));
83 condlog(3, "libdevmapper version %s", version);
84 sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
86 if ((v[0] > minv[0]) ||
87 ((v[0] == minv[0]) && (v[1] > minv[1])) ||
88 ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])))
90 condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
91 minv[0], minv[1], minv[2]);
96 dm_drvprereq (char * str)
100 struct dm_versions *target;
101 struct dm_versions *last_target;
102 int minv[3] = {1, 0, 3};
105 if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
108 dm_task_no_open_count(dmt);
110 if (!dm_task_run(dmt)) {
111 condlog(0, "Can not communicate with kernel DM");
114 target = dm_task_get_versions(dmt);
117 last_target = target;
118 if (!strncmp(str, target->name, strlen(str))) {
122 target = (void *) target + target->next;
123 } while (last_target != target);
126 condlog(0, "DM multipath kernel driver not loaded");
130 if ((v[0] > minv[0]) ||
131 ((v[0] == minv[0]) && (v[1] > minv[1])) ||
132 ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2]))) {
136 condlog(0, "DM multipath kernel driver must be >= %u.%.2u.%.2u",
137 minv[0], minv[1], minv[2]);
139 dm_task_destroy(dmt);
148 return dm_drvprereq(TGT_MPATH);
152 dm_simplecmd (int task, const char *name, int no_flush) {
156 if (!(dmt = dm_task_create (task)))
159 if (!dm_task_set_name (dmt, name))
162 dm_task_no_open_count(dmt);
163 dm_task_skip_lockfs(dmt); /* for DM_DEVICE_RESUME */
164 #ifdef LIBDM_API_FLUSH
166 dm_task_no_flush(dmt); /* for DM_DEVICE_SUSPEND/RESUME */
169 r = dm_task_run (dmt);
172 dm_task_destroy (dmt);
177 dm_simplecmd_flush (int task, const char *name) {
178 return dm_simplecmd(task, name, 0);
182 dm_simplecmd_noflush (int task, const char *name) {
183 return dm_simplecmd(task, name, 1);
187 dm_addmap (int task, const char *target, struct multipath *mpp, int use_uuid,
191 char *prefixed_uuid = NULL;
193 if (!(dmt = dm_task_create (task)))
196 if (!dm_task_set_name (dmt, mpp->alias))
199 if (!dm_task_add_target (dmt, 0, mpp->size, target, mpp->params))
205 if (use_uuid && mpp->wwid){
206 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(mpp->wwid) + 1);
207 if (!prefixed_uuid) {
208 condlog(0, "cannot create prefixed uuid : %s\n",
212 sprintf(prefixed_uuid, UUID_PREFIX "%s", mpp->wwid);
213 if (!dm_task_set_uuid(dmt, prefixed_uuid))
217 if (mpp->attribute_flags & (1 << ATTR_MODE) &&
218 !dm_task_set_mode(dmt, mpp->mode))
220 if (mpp->attribute_flags & (1 << ATTR_UID) &&
221 !dm_task_set_uid(dmt, mpp->uid))
223 if (mpp->attribute_flags & (1 << ATTR_GID) &&
224 !dm_task_set_gid(dmt, mpp->gid))
227 dm_task_no_open_count(dmt);
229 r = dm_task_run (dmt);
236 dm_task_destroy (dmt);
242 _dm_addmap_create (struct multipath *mpp, int ro) {
244 r = dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, 1, ro);
246 * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
247 * Failing the second part leaves an empty map. Clean it up.
249 if (!r && dm_map_present(mpp->alias)) {
250 condlog(3, "%s: failed to load map (a path might be in use)",
252 dm_flush_map(mpp->alias);
261 dm_addmap_create (struct multipath *mpp) {
262 return _dm_addmap_create(mpp, ADDMAP_RW);
266 dm_addmap_create_ro (struct multipath *mpp) {
267 return _dm_addmap_create(mpp, ADDMAP_RO);
271 dm_addmap_reload (struct multipath *mpp) {
272 return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RW);
276 dm_addmap_reload_ro (struct multipath *mpp) {
277 return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RO);
281 dm_map_present (const char * str)
287 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
290 if (!dm_task_set_name(dmt, str))
293 dm_task_no_open_count(dmt);
295 if (!dm_task_run(dmt))
298 if (!dm_task_get_info(dmt, &info))
304 dm_task_destroy(dmt);
309 dm_get_map(char * name, unsigned long long * size, char * outparams)
314 uint64_t start, length;
315 char *target_type = NULL;
318 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
321 if (!dm_task_set_name(dmt, name))
324 dm_task_no_open_count(dmt);
326 if (!dm_task_run(dmt))
329 /* Fetch 1st target */
330 next = dm_get_next_target(dmt, next, &start, &length,
331 &target_type, ¶ms);
336 if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
339 dm_task_destroy(dmt);
344 dm_get_uuid(char *name, char *uuid)
350 dmt = dm_task_create(DM_DEVICE_INFO);
354 if (!dm_task_set_name (dmt, name))
357 if (!dm_task_run(dmt))
360 uuidtmp = dm_task_get_uuid(dmt);
362 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
363 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
365 strcpy(uuid, uuidtmp);
372 dm_task_destroy(dmt);
377 dm_get_status(char * name, char * outstatus)
382 uint64_t start, length;
386 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
389 if (!dm_task_set_name(dmt, name))
392 dm_task_no_open_count(dmt);
394 if (!dm_task_run(dmt))
397 /* Fetch 1st target */
398 next = dm_get_next_target(dmt, next, &start, &length,
399 &target_type, &status);
401 if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
405 condlog(0, "%s: error getting map status string", name);
407 dm_task_destroy(dmt);
418 dm_type(const char * name, char * type)
423 uint64_t start, length;
424 char *target_type = NULL;
427 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
430 if (!dm_task_set_name(dmt, name))
433 dm_task_no_open_count(dmt);
435 if (!dm_task_run(dmt))
438 /* Fetch 1st target */
439 next = dm_get_next_target(dmt, next, &start, &length,
440 &target_type, ¶ms);
444 else if (!strcmp(target_type, type))
448 dm_task_destroy(dmt);
453 dm_dev_t (const char * mapname, char * dev_t, int len)
459 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
462 if (!dm_task_set_name(dmt, mapname))
465 if (!dm_task_run(dmt))
468 if (!dm_task_get_info(dmt, &info))
472 if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
477 dm_task_destroy(dmt);
482 dm_get_opencount (const char * mapname)
488 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
491 if (!dm_task_set_name(dmt, mapname))
494 if (!dm_task_run(dmt))
497 if (!dm_task_get_info(dmt, &info))
502 dm_task_destroy(dmt);
507 dm_get_minor (char * mapname)
513 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
516 if (!dm_task_set_name(dmt, mapname))
519 if (!dm_task_run(dmt))
522 if (!dm_task_get_info(dmt, &info))
527 dm_task_destroy(dmt);
532 dm_flush_map (const char * mapname)
536 if (!dm_map_present(mapname))
539 if (dm_type(mapname, TGT_MPATH) <= 0)
540 return 0; /* nothing to do */
542 if (dm_remove_partmaps(mapname))
545 if (dm_get_opencount(mapname)) {
546 condlog(2, "%s: map in use", mapname);
550 r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname);
553 condlog(4, "multipath map %s removed", mapname);
564 struct dm_names *names;
567 if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
570 dm_task_no_open_count(dmt);
572 if (!dm_task_run (dmt))
575 if (!(names = dm_task_get_names (dmt)))
582 r |= dm_flush_map(names->name);
584 names = (void *) names + next;
588 dm_task_destroy (dmt);
593 dm_message(char * mapname, char * message)
598 if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
601 if (!dm_task_set_name(dmt, mapname))
604 if (!dm_task_set_sector(dmt, 0))
607 if (!dm_task_set_message(dmt, message))
610 dm_task_no_open_count(dmt);
612 if (!dm_task_run(dmt))
618 condlog(0, "DM message failed [%s]", message);
620 dm_task_destroy(dmt);
625 dm_fail_path(char * mapname, char * path)
629 if (snprintf(message, 32, "fail_path %s\n", path) > 32)
632 return dm_message(mapname, message);
636 dm_reinstate_path(char * mapname, char * path)
640 if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
643 return dm_message(mapname, message);
647 dm_queue_if_no_path(char *mapname, int enable)
652 message = "queue_if_no_path\n";
654 message = "fail_if_no_path\n";
656 return dm_message(mapname, message);
660 dm_set_pg_timeout(char *mapname, int timeout_val)
664 if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
666 return dm_message(mapname, message);
670 dm_groupmsg (char * msg, char * mapname, int index)
674 if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
677 return dm_message(mapname, message);
681 dm_switchgroup(char * mapname, int index)
683 return dm_groupmsg("switch", mapname, index);
687 dm_enablegroup(char * mapname, int index)
689 return dm_groupmsg("enable", mapname, index);
693 dm_disablegroup(char * mapname, int index)
695 return dm_groupmsg("disable", mapname, index);
699 dm_get_maps (vector mp)
701 struct multipath * mpp;
705 struct dm_names *names;
711 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
714 dm_task_no_open_count(dmt);
716 if (!dm_task_run(dmt))
719 if (!(names = dm_task_get_names(dmt)))
723 r = 0; /* this is perfectly valid */
728 info = dm_type(names->name, TGT_MPATH);
733 mpp = alloc_multipath();
738 mpp->alias = STRDUP(names->name);
744 if (dm_get_map(names->name, &mpp->size, mpp->params))
747 if (dm_get_status(names->name, mpp->status))
750 dm_get_uuid(names->name, mpp->wwid);
751 dm_get_info(names->name, &mpp->dmi);
754 if (!vector_alloc_slot(mp))
757 vector_set_slot(mp, mpp);
761 names = (void *) names + next;
767 free_multipath(mpp, KEEP_PATHS);
769 dm_task_destroy (dmt);
774 dm_get_name(char *uuid, char *name)
777 struct multipath *mpp;
780 vec = vector_alloc();
785 if (dm_get_maps(vec)) {
789 vector_foreach_slot(vec, mpp, i) {
790 if (!strcmp(uuid, mpp->wwid)) {
791 strcpy(name, mpp->alias);
797 vector_foreach_slot(vec, mpp, i) {
798 free_multipath(mpp, KEEP_PATHS);
805 dm_geteventnr (char *name)
810 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
813 if (!dm_task_set_name(dmt, name))
816 dm_task_no_open_count(dmt);
818 if (!dm_task_run(dmt))
821 if (!dm_task_get_info(dmt, &info)) {
832 dm_task_destroy(dmt);
834 return info.event_nr;
838 dm_mapname(int major, int minor)
840 char * response = NULL;
844 int loop = MAX_WAIT * LOOPS_PER_SEC;
846 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
849 if (!dm_task_set_major(dmt, major) ||
850 !dm_task_set_minor(dmt, minor))
853 dm_task_no_open_count(dmt);
856 * device map might not be ready when we get here from
857 * daemon uev_trigger -> uev_add_map
860 r = dm_task_run(dmt);
865 usleep(1000 * 1000 / LOOPS_PER_SEC);
869 condlog(0, "%i:%i: timeout fetching map name", major, minor);
873 map = dm_task_get_name(dmt);
874 if (map && strlen(map))
875 response = STRDUP((char *)dm_task_get_name(dmt));
877 dm_task_destroy(dmt);
880 dm_task_destroy(dmt);
881 condlog(0, "%i:%i: error fetching map name", major, minor);
886 dm_remove_partmaps (const char * mapname)
889 struct dm_names *names;
891 char params[PARAMS_SIZE];
892 unsigned long long size;
896 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
899 dm_task_no_open_count(dmt);
901 if (!dm_task_run(dmt))
904 if (!(names = dm_task_get_names(dmt)))
908 r = 0; /* this is perfectly valid */
912 if (dm_dev_t(mapname, &dev_t[0], 32))
918 * if devmap target is "linear"
920 (dm_type(names->name, TGT_PART) > 0) &&
923 * and the multipath mapname and the part mapname start
926 !strncmp(names->name, mapname, strlen(mapname)) &&
929 * and the opencount is 0 for us to allow removal
931 !dm_get_opencount(names->name) &&
934 * and we can fetch the map table from the kernel
936 !dm_get_map(names->name, &size, ¶ms[0]) &&
939 * and the table maps over the multipath map
941 strstr(params, dev_t)
944 * then it's a kpartx generated partition.
947 condlog(4, "partition map %s removed",
949 dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name);
953 names = (void *) names + next;
958 dm_task_destroy (dmt);
962 static struct dm_info *
965 return MALLOC(sizeof(struct dm_info));
969 dm_get_info (char * mapname, struct dm_info ** dmi)
972 struct dm_task *dmt = NULL;
978 *dmi = alloc_dminfo();
983 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
986 if (!dm_task_set_name(dmt, mapname))
989 dm_task_no_open_count(dmt);
991 if (!dm_task_run(dmt))
994 if (!dm_task_get_info(dmt, *dmi))
1000 memset(*dmi, 0, sizeof(struct dm_info));
1006 dm_task_destroy(dmt);
1012 dm_rename_partmaps (char * old, char * new)
1014 struct dm_task *dmt;
1015 struct dm_names *names;
1017 char buff[PARAMS_SIZE];
1018 unsigned long long size;
1022 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1025 dm_task_no_open_count(dmt);
1027 if (!dm_task_run(dmt))
1030 if (!(names = dm_task_get_names(dmt)))
1034 r = 0; /* this is perfectly valid */
1038 if (dm_dev_t(old, &dev_t[0], 32))
1044 * if devmap target is "linear"
1046 (dm_type(names->name, TGT_PART) > 0) &&
1049 * and the multipath mapname and the part mapname start
1052 !strncmp(names->name, old, strlen(old)) &&
1055 * and we can fetch the map table from the kernel
1057 !dm_get_map(names->name, &size, &buff[0]) &&
1060 * and the table maps over the multipath map
1065 * then it's a kpartx generated partition.
1068 snprintf(buff, PARAMS_SIZE, "%s%s",
1069 new, names->name + strlen(old));
1070 dm_rename(names->name, buff);
1071 condlog(4, "partition map %s renamed",
1076 names = (void *) names + next;
1081 dm_task_destroy (dmt);
1086 dm_rename (char * old, char * new)
1089 struct dm_task *dmt;
1091 if (dm_rename_partmaps(old, new))
1094 if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1097 if (!dm_task_set_name(dmt, old))
1100 if (!dm_task_set_newname(dmt, new))
1103 dm_task_no_open_count(dmt);
1105 if (!dm_task_run(dmt))
1110 dm_task_destroy(dmt);