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, 38};
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, int need_sync) {
154 int udev_wait_flag = (need_sync && (task == DM_DEVICE_RESUME ||
155 task == DM_DEVICE_REMOVE));
158 if (!(dmt = dm_task_create (task)))
161 if (!dm_task_set_name (dmt, name))
164 dm_task_no_open_count(dmt);
165 dm_task_skip_lockfs(dmt); /* for DM_DEVICE_RESUME */
166 #ifdef LIBDM_API_FLUSH
168 dm_task_no_flush(dmt); /* for DM_DEVICE_SUSPEND/RESUME */
171 if (udev_wait_flag && !dm_task_set_cookie(dmt, &conf->cookie, 0))
173 r = dm_task_run (dmt);
176 dm_task_destroy (dmt);
181 dm_simplecmd_flush (int task, const char *name, int needsync) {
182 return dm_simplecmd(task, name, 0, needsync);
186 dm_simplecmd_noflush (int task, const char *name) {
187 return dm_simplecmd(task, name, 1, 1);
191 dm_addmap (int task, const char *target, struct multipath *mpp, int use_uuid,
195 char *prefixed_uuid = NULL;
197 if (!(dmt = dm_task_create (task)))
200 if (!dm_task_set_name (dmt, mpp->alias))
203 if (!dm_task_add_target (dmt, 0, mpp->size, target, mpp->params))
209 if (use_uuid && mpp->wwid){
210 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(mpp->wwid) + 1);
211 if (!prefixed_uuid) {
212 condlog(0, "cannot create prefixed uuid : %s\n",
216 sprintf(prefixed_uuid, UUID_PREFIX "%s", mpp->wwid);
217 if (!dm_task_set_uuid(dmt, prefixed_uuid))
221 if (mpp->attribute_flags & (1 << ATTR_MODE) &&
222 !dm_task_set_mode(dmt, mpp->mode))
224 if (mpp->attribute_flags & (1 << ATTR_UID) &&
225 !dm_task_set_uid(dmt, mpp->uid))
227 if (mpp->attribute_flags & (1 << ATTR_GID) &&
228 !dm_task_set_gid(dmt, mpp->gid))
231 dm_task_no_open_count(dmt);
233 if (task == DM_DEVICE_CREATE &&
234 !dm_task_set_cookie(dmt, &conf->cookie, 0))
236 r = dm_task_run (dmt);
243 dm_task_destroy (dmt);
249 _dm_addmap_create (struct multipath *mpp, int ro) {
251 r = dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, 1, ro);
253 * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
254 * Failing the second part leaves an empty map. Clean it up.
256 if (!r && dm_map_present(mpp->alias)) {
257 condlog(3, "%s: failed to load map (a path might be in use)",
259 dm_flush_map_nosync(mpp->alias);
268 dm_addmap_create (struct multipath *mpp) {
269 return _dm_addmap_create(mpp, ADDMAP_RW);
273 dm_addmap_create_ro (struct multipath *mpp) {
274 return _dm_addmap_create(mpp, ADDMAP_RO);
278 dm_addmap_reload (struct multipath *mpp) {
279 return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RW);
283 dm_addmap_reload_ro (struct multipath *mpp) {
284 return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RO);
288 dm_map_present (const char * str)
294 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
297 if (!dm_task_set_name(dmt, str))
300 dm_task_no_open_count(dmt);
302 if (!dm_task_run(dmt))
305 if (!dm_task_get_info(dmt, &info))
311 dm_task_destroy(dmt);
316 dm_get_map(char * name, unsigned long long * size, char * outparams)
321 uint64_t start, length;
322 char *target_type = NULL;
325 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
328 if (!dm_task_set_name(dmt, name))
331 dm_task_no_open_count(dmt);
333 if (!dm_task_run(dmt))
336 /* Fetch 1st target */
337 next = dm_get_next_target(dmt, next, &start, &length,
338 &target_type, ¶ms);
343 if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
346 dm_task_destroy(dmt);
351 dm_get_uuid(char *name, char *uuid)
357 dmt = dm_task_create(DM_DEVICE_INFO);
361 if (!dm_task_set_name (dmt, name))
364 if (!dm_task_run(dmt))
367 uuidtmp = dm_task_get_uuid(dmt);
369 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
370 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
372 strcpy(uuid, uuidtmp);
379 dm_task_destroy(dmt);
384 dm_get_status(char * name, char * outstatus)
389 uint64_t start, length;
393 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
396 if (!dm_task_set_name(dmt, name))
399 dm_task_no_open_count(dmt);
401 if (!dm_task_run(dmt))
404 /* Fetch 1st target */
405 next = dm_get_next_target(dmt, next, &start, &length,
406 &target_type, &status);
408 if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
412 condlog(0, "%s: error getting map status string", name);
414 dm_task_destroy(dmt);
425 dm_type(const char * name, char * type)
430 uint64_t start, length;
431 char *target_type = NULL;
434 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
437 if (!dm_task_set_name(dmt, name))
440 dm_task_no_open_count(dmt);
442 if (!dm_task_run(dmt))
445 /* Fetch 1st target */
446 next = dm_get_next_target(dmt, next, &start, &length,
447 &target_type, ¶ms);
451 else if (!strcmp(target_type, type))
455 dm_task_destroy(dmt);
460 dm_dev_t (const char * mapname, char * dev_t, int len)
466 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
469 if (!dm_task_set_name(dmt, mapname))
472 if (!dm_task_run(dmt))
475 if (!dm_task_get_info(dmt, &info))
479 if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
484 dm_task_destroy(dmt);
489 dm_get_opencount (const char * mapname)
495 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
498 if (!dm_task_set_name(dmt, mapname))
501 if (!dm_task_run(dmt))
504 if (!dm_task_get_info(dmt, &info))
509 dm_task_destroy(dmt);
514 dm_get_minor (char * mapname)
520 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
523 if (!dm_task_set_name(dmt, mapname))
526 if (!dm_task_run(dmt))
529 if (!dm_task_get_info(dmt, &info))
534 dm_task_destroy(dmt);
539 _dm_flush_map (const char * mapname, int need_sync)
543 if (!dm_map_present(mapname))
546 if (dm_type(mapname, TGT_MPATH) <= 0)
547 return 0; /* nothing to do */
549 if (dm_remove_partmaps(mapname, need_sync))
552 if (dm_get_opencount(mapname)) {
553 condlog(2, "%s: map in use", mapname);
557 r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname, need_sync);
560 condlog(4, "multipath map %s removed", mapname);
571 struct dm_names *names;
574 if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
577 dm_task_no_open_count(dmt);
579 if (!dm_task_run (dmt))
582 if (!(names = dm_task_get_names (dmt)))
589 r |= dm_flush_map(names->name);
591 names = (void *) names + next;
595 dm_task_destroy (dmt);
600 dm_message(char * mapname, char * message)
605 if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
608 if (!dm_task_set_name(dmt, mapname))
611 if (!dm_task_set_sector(dmt, 0))
614 if (!dm_task_set_message(dmt, message))
617 dm_task_no_open_count(dmt);
619 if (!dm_task_run(dmt))
625 condlog(0, "DM message failed [%s]", message);
627 dm_task_destroy(dmt);
632 dm_fail_path(char * mapname, char * path)
636 if (snprintf(message, 32, "fail_path %s\n", path) > 32)
639 return dm_message(mapname, message);
643 dm_reinstate_path(char * mapname, char * path)
647 if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
650 return dm_message(mapname, message);
654 dm_queue_if_no_path(char *mapname, int enable)
659 message = "queue_if_no_path\n";
661 message = "fail_if_no_path\n";
663 return dm_message(mapname, message);
667 dm_set_pg_timeout(char *mapname, int timeout_val)
671 if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
673 return dm_message(mapname, message);
677 dm_groupmsg (char * msg, char * mapname, int index)
681 if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
684 return dm_message(mapname, message);
688 dm_switchgroup(char * mapname, int index)
690 return dm_groupmsg("switch", mapname, index);
694 dm_enablegroup(char * mapname, int index)
696 return dm_groupmsg("enable", mapname, index);
700 dm_disablegroup(char * mapname, int index)
702 return dm_groupmsg("disable", mapname, index);
706 dm_get_maps (vector mp)
708 struct multipath * mpp;
712 struct dm_names *names;
718 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
721 dm_task_no_open_count(dmt);
723 if (!dm_task_run(dmt))
726 if (!(names = dm_task_get_names(dmt)))
730 r = 0; /* this is perfectly valid */
735 info = dm_type(names->name, TGT_MPATH);
740 mpp = alloc_multipath();
745 mpp->alias = STRDUP(names->name);
751 if (dm_get_map(names->name, &mpp->size, mpp->params))
754 if (dm_get_status(names->name, mpp->status))
757 dm_get_uuid(names->name, mpp->wwid);
758 dm_get_info(names->name, &mpp->dmi);
761 if (!vector_alloc_slot(mp))
764 vector_set_slot(mp, mpp);
768 names = (void *) names + next;
774 free_multipath(mpp, KEEP_PATHS);
776 dm_task_destroy (dmt);
781 dm_get_name(char *uuid)
785 char *prefixed_uuid, *name = NULL;
788 dmt = dm_task_create(DM_DEVICE_INFO);
792 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
793 if (!prefixed_uuid) {
794 condlog(0, "cannot create prefixed uuid : %s\n",
798 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
799 if (!dm_task_set_uuid(dmt, prefixed_uuid))
802 if (!dm_task_run(dmt))
805 if (!dm_task_get_info(dmt, &info) || !info.exists)
808 nametmp = dm_task_get_name(dmt);
809 if (nametmp && strlen(nametmp)) {
810 name = MALLOC(strlen(nametmp) + 1);
812 strcpy(name, nametmp);
814 condlog(2, "%s: no device-mapper name found", uuid);
820 dm_task_destroy(dmt);
826 dm_geteventnr (char *name)
831 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
834 if (!dm_task_set_name(dmt, name))
837 dm_task_no_open_count(dmt);
839 if (!dm_task_run(dmt))
842 if (!dm_task_get_info(dmt, &info)) {
853 dm_task_destroy(dmt);
855 return info.event_nr;
859 dm_mapname(int major, int minor)
861 char * response = NULL;
865 int loop = MAX_WAIT * LOOPS_PER_SEC;
867 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
870 if (!dm_task_set_major(dmt, major) ||
871 !dm_task_set_minor(dmt, minor))
874 dm_task_no_open_count(dmt);
877 * device map might not be ready when we get here from
878 * daemon uev_trigger -> uev_add_map
881 r = dm_task_run(dmt);
886 usleep(1000 * 1000 / LOOPS_PER_SEC);
890 condlog(0, "%i:%i: timeout fetching map name", major, minor);
894 map = dm_task_get_name(dmt);
895 if (map && strlen(map))
896 response = STRDUP((char *)dm_task_get_name(dmt));
898 dm_task_destroy(dmt);
901 dm_task_destroy(dmt);
902 condlog(0, "%i:%i: error fetching map name", major, minor);
907 dm_remove_partmaps (const char * mapname, int need_sync)
910 struct dm_names *names;
912 char params[PARAMS_SIZE];
913 unsigned long long size;
917 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
920 dm_task_no_open_count(dmt);
922 if (!dm_task_run(dmt))
925 if (!(names = dm_task_get_names(dmt)))
929 r = 0; /* this is perfectly valid */
933 if (dm_dev_t(mapname, &dev_t[0], 32))
939 * if devmap target is "linear"
941 (dm_type(names->name, TGT_PART) > 0) &&
944 * and the multipath mapname and the part mapname start
947 !strncmp(names->name, mapname, strlen(mapname)) &&
950 * and the opencount is 0 for us to allow removal
952 !dm_get_opencount(names->name) &&
955 * and we can fetch the map table from the kernel
957 !dm_get_map(names->name, &size, ¶ms[0]) &&
960 * and the table maps over the multipath map
962 strstr(params, dev_t)
965 * then it's a kpartx generated partition.
968 condlog(4, "partition map %s removed",
970 dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name, need_sync);
974 names = (void *) names + next;
979 dm_task_destroy (dmt);
983 static struct dm_info *
986 return MALLOC(sizeof(struct dm_info));
990 dm_get_info (char * mapname, struct dm_info ** dmi)
993 struct dm_task *dmt = NULL;
999 *dmi = alloc_dminfo();
1004 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
1007 if (!dm_task_set_name(dmt, mapname))
1010 dm_task_no_open_count(dmt);
1012 if (!dm_task_run(dmt))
1015 if (!dm_task_get_info(dmt, *dmi))
1021 memset(*dmi, 0, sizeof(struct dm_info));
1027 dm_task_destroy(dmt);
1033 dm_rename_partmaps (char * old, char * new)
1035 struct dm_task *dmt;
1036 struct dm_names *names;
1038 char buff[PARAMS_SIZE];
1039 unsigned long long size;
1043 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1046 dm_task_no_open_count(dmt);
1048 if (!dm_task_run(dmt))
1051 if (!(names = dm_task_get_names(dmt)))
1055 r = 0; /* this is perfectly valid */
1059 if (dm_dev_t(old, &dev_t[0], 32))
1065 * if devmap target is "linear"
1067 (dm_type(names->name, TGT_PART) > 0) &&
1070 * and the multipath mapname and the part mapname start
1073 !strncmp(names->name, old, strlen(old)) &&
1076 * and we can fetch the map table from the kernel
1078 !dm_get_map(names->name, &size, &buff[0]) &&
1081 * and the table maps over the multipath map
1086 * then it's a kpartx generated partition.
1089 snprintf(buff, PARAMS_SIZE, "%s%s",
1090 new, names->name + strlen(old));
1091 dm_rename(names->name, buff);
1092 condlog(4, "partition map %s renamed",
1097 names = (void *) names + next;
1102 dm_task_destroy (dmt);
1107 dm_rename (char * old, char * new)
1110 struct dm_task *dmt;
1112 if (dm_rename_partmaps(old, new))
1115 if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1118 if (!dm_task_set_name(dmt, old))
1121 if (!dm_task_set_newname(dmt, new))
1124 dm_task_no_open_count(dmt);
1126 if (!dm_task_set_cookie(dmt, &conf->cookie, 0))
1128 if (!dm_task_run(dmt))
1133 dm_task_destroy(dmt);
1137 int dm_setgeometry(struct multipath *mpp)
1139 struct dm_task *dmt;
1141 char heads[4], sectors[4];
1142 char cylinders[10], start[32];
1148 pp = first_path(mpp);
1150 condlog(3, "%s: no path for geometry", mpp->alias);
1153 if (pp->geom.cylinders == 0 ||
1154 pp->geom.heads == 0 ||
1155 pp->geom.sectors == 0) {
1156 condlog(3, "%s: invalid geometry on %s", mpp->alias, pp->dev);
1160 if (!(dmt = dm_task_create(DM_DEVICE_SET_GEOMETRY)))
1163 if (!dm_task_set_name(dmt, mpp->alias))
1166 dm_task_no_open_count(dmt);
1168 /* What a sick interface ... */
1169 snprintf(heads, 4, "%u", pp->geom.heads);
1170 snprintf(sectors, 4, "%u", pp->geom.sectors);
1171 snprintf(cylinders, 10, "%u", pp->geom.cylinders);
1172 snprintf(start, 32, "%lu", pp->geom.start);
1173 if (!dm_task_set_geometry(dmt, cylinders, heads, sectors, start)) {
1174 condlog(3, "%s: Failed to set geometry", mpp->alias);
1178 r = dm_task_run(dmt);
1180 dm_task_destroy(dmt);