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);
75 #define VERSION_GE(v, minv) ( \
77 ((v[0] == minv[0]) && (v[1] > minv[1])) || \
78 ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])) \
86 int minv[3] = {1, 2, 38};
88 dm_get_library_version(version, sizeof(version));
89 condlog(3, "libdevmapper version %s", version);
90 sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
92 if VERSION_GE(v, minv)
94 condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
95 minv[0], minv[1], minv[2]);
100 dm_drv_version (unsigned int * version, char * str)
104 struct dm_versions *target;
105 struct dm_versions *last_target;
108 if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
111 dm_task_no_open_count(dmt);
113 if (!dm_task_run(dmt)) {
114 condlog(0, "Can not communicate with kernel DM");
117 target = dm_task_get_versions(dmt);
120 last_target = target;
121 if (!strncmp(str, target->name, strlen(str))) {
125 target = (void *) target + target->next;
126 } while (last_target != target);
129 condlog(0, "DM %s kernel driver not loaded", str);
138 dm_task_destroy(dmt);
145 unsigned int minv_dmrq[3] = {1, 1, 0};
146 unsigned int version[3] = {0, 0, 0};
147 unsigned int * v = version;
149 if (dm_drv_version(v, TGT_MPATH)) {
150 /* in doubt return least capable */
154 /* test request based multipath capability */
155 if VERSION_GE(v, minv_dmrq) {
156 condlog(3, "activate request-based multipathing mode "
157 "(driver >= v%u.%u.%u)",
158 minv_dmrq[0], minv_dmrq[1], minv_dmrq[2]);
167 unsigned int minv[3] = {1, 0, 3};
168 unsigned int version[3] = {0, 0, 0};
169 unsigned int * v = version;
171 if (dm_drv_version(v, TGT_MPATH)) {
172 /* in doubt return not capable */
176 /* test request based multipath capability */
177 condlog(3, "DM multipath kernel driver v%u.%u.%u",
180 if VERSION_GE(v, minv)
183 condlog(0, "DM multipath kernel driver must be >= v%u.%u.%u",
184 minv[0], minv[1], minv[2]);
193 return dm_drv_prereq();
197 dm_simplecmd (int task, const char *name, int no_flush, int need_sync) {
199 int udev_wait_flag = (need_sync && (task == DM_DEVICE_RESUME ||
200 task == DM_DEVICE_REMOVE));
203 if (!(dmt = dm_task_create (task)))
206 if (!dm_task_set_name (dmt, name))
209 dm_task_no_open_count(dmt);
210 dm_task_skip_lockfs(dmt); /* for DM_DEVICE_RESUME */
211 #ifdef LIBDM_API_FLUSH
213 dm_task_no_flush(dmt); /* for DM_DEVICE_SUSPEND/RESUME */
216 if (udev_wait_flag && !dm_task_set_cookie(dmt, &conf->cookie, 0))
218 r = dm_task_run (dmt);
221 dm_task_destroy (dmt);
226 dm_simplecmd_flush (int task, const char *name, int needsync) {
227 return dm_simplecmd(task, name, 0, needsync);
231 dm_simplecmd_noflush (int task, const char *name) {
232 return dm_simplecmd(task, name, 1, 1);
236 dm_addmap (int task, const char *target, struct multipath *mpp, int use_uuid,
240 char *prefixed_uuid = NULL;
242 if (!(dmt = dm_task_create (task)))
245 if (!dm_task_set_name (dmt, mpp->alias))
248 if (!dm_task_add_target (dmt, 0, mpp->size, target, mpp->params))
254 if (use_uuid && mpp->wwid){
255 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(mpp->wwid) + 1);
256 if (!prefixed_uuid) {
257 condlog(0, "cannot create prefixed uuid : %s\n",
261 sprintf(prefixed_uuid, UUID_PREFIX "%s", mpp->wwid);
262 if (!dm_task_set_uuid(dmt, prefixed_uuid))
266 if (mpp->attribute_flags & (1 << ATTR_MODE) &&
267 !dm_task_set_mode(dmt, mpp->mode))
269 if (mpp->attribute_flags & (1 << ATTR_UID) &&
270 !dm_task_set_uid(dmt, mpp->uid))
272 if (mpp->attribute_flags & (1 << ATTR_GID) &&
273 !dm_task_set_gid(dmt, mpp->gid))
276 dm_task_no_open_count(dmt);
278 if (task == DM_DEVICE_CREATE &&
279 !dm_task_set_cookie(dmt, &conf->cookie, 0))
281 r = dm_task_run (dmt);
288 dm_task_destroy (dmt);
294 _dm_addmap_create (struct multipath *mpp, int ro) {
296 r = dm_addmap(DM_DEVICE_CREATE, TGT_MPATH, mpp, 1, ro);
298 * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
299 * Failing the second part leaves an empty map. Clean it up.
301 if (!r && dm_map_present(mpp->alias)) {
302 condlog(3, "%s: failed to load map (a path might be in use)",
304 dm_flush_map_nosync(mpp->alias);
313 dm_addmap_create (struct multipath *mpp) {
314 return _dm_addmap_create(mpp, ADDMAP_RW);
318 dm_addmap_create_ro (struct multipath *mpp) {
319 return _dm_addmap_create(mpp, ADDMAP_RO);
323 dm_addmap_reload (struct multipath *mpp) {
324 return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RW);
328 dm_addmap_reload_ro (struct multipath *mpp) {
329 return dm_addmap(DM_DEVICE_RELOAD, TGT_MPATH, mpp, 0, ADDMAP_RO);
333 dm_map_present (const char * str)
339 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
342 if (!dm_task_set_name(dmt, str))
345 dm_task_no_open_count(dmt);
347 if (!dm_task_run(dmt))
350 if (!dm_task_get_info(dmt, &info))
356 dm_task_destroy(dmt);
361 dm_get_map(char * name, unsigned long long * size, char * outparams)
366 uint64_t start, length;
367 char *target_type = NULL;
370 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
373 if (!dm_task_set_name(dmt, name))
376 dm_task_no_open_count(dmt);
378 if (!dm_task_run(dmt))
381 /* Fetch 1st target */
382 next = dm_get_next_target(dmt, next, &start, &length,
383 &target_type, ¶ms);
388 if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
391 dm_task_destroy(dmt);
396 dm_get_uuid(char *name, char *uuid)
402 dmt = dm_task_create(DM_DEVICE_INFO);
406 if (!dm_task_set_name (dmt, name))
409 if (!dm_task_run(dmt))
412 uuidtmp = dm_task_get_uuid(dmt);
414 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
415 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
417 strcpy(uuid, uuidtmp);
424 dm_task_destroy(dmt);
429 dm_get_status(char * name, char * outstatus)
434 uint64_t start, length;
438 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
441 if (!dm_task_set_name(dmt, name))
444 dm_task_no_open_count(dmt);
446 if (!dm_task_run(dmt))
449 /* Fetch 1st target */
450 next = dm_get_next_target(dmt, next, &start, &length,
451 &target_type, &status);
453 if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
457 condlog(0, "%s: error getting map status string", name);
459 dm_task_destroy(dmt);
470 dm_type(const char * name, char * type)
475 uint64_t start, length;
476 char *target_type = NULL;
479 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
482 if (!dm_task_set_name(dmt, name))
485 dm_task_no_open_count(dmt);
487 if (!dm_task_run(dmt))
490 /* Fetch 1st target */
491 next = dm_get_next_target(dmt, next, &start, &length,
492 &target_type, ¶ms);
496 else if (!strcmp(target_type, type))
500 dm_task_destroy(dmt);
505 dm_dev_t (const char * mapname, char * dev_t, int len)
511 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
514 if (!dm_task_set_name(dmt, mapname))
517 if (!dm_task_run(dmt))
520 if (!dm_task_get_info(dmt, &info))
524 if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
529 dm_task_destroy(dmt);
534 dm_get_opencount (const char * mapname)
540 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
543 if (!dm_task_set_name(dmt, mapname))
546 if (!dm_task_run(dmt))
549 if (!dm_task_get_info(dmt, &info))
554 dm_task_destroy(dmt);
559 dm_get_minor (char * mapname)
565 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
568 if (!dm_task_set_name(dmt, mapname))
571 if (!dm_task_run(dmt))
574 if (!dm_task_get_info(dmt, &info))
579 dm_task_destroy(dmt);
584 _dm_flush_map (const char * mapname, int need_sync)
588 if (!dm_map_present(mapname))
591 if (dm_type(mapname, TGT_MPATH) <= 0)
592 return 0; /* nothing to do */
594 if (dm_remove_partmaps(mapname, need_sync))
597 if (dm_get_opencount(mapname)) {
598 condlog(2, "%s: map in use", mapname);
602 r = dm_simplecmd_flush(DM_DEVICE_REMOVE, mapname, need_sync);
605 condlog(4, "multipath map %s removed", mapname);
616 struct dm_names *names;
619 if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
622 dm_task_no_open_count(dmt);
624 if (!dm_task_run (dmt))
627 if (!(names = dm_task_get_names (dmt)))
634 r |= dm_flush_map(names->name);
636 names = (void *) names + next;
640 dm_task_destroy (dmt);
645 dm_message(char * mapname, char * message)
650 if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
653 if (!dm_task_set_name(dmt, mapname))
656 if (!dm_task_set_sector(dmt, 0))
659 if (!dm_task_set_message(dmt, message))
662 dm_task_no_open_count(dmt);
664 if (!dm_task_run(dmt))
670 condlog(0, "DM message failed [%s]", message);
672 dm_task_destroy(dmt);
677 dm_fail_path(char * mapname, char * path)
681 if (snprintf(message, 32, "fail_path %s\n", path) > 32)
684 return dm_message(mapname, message);
688 dm_reinstate_path(char * mapname, char * path)
692 if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
695 return dm_message(mapname, message);
699 dm_queue_if_no_path(char *mapname, int enable)
704 message = "queue_if_no_path\n";
706 message = "fail_if_no_path\n";
708 return dm_message(mapname, message);
712 dm_set_pg_timeout(char *mapname, int timeout_val)
716 if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
718 return dm_message(mapname, message);
722 dm_groupmsg (char * msg, char * mapname, int index)
726 if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
729 return dm_message(mapname, message);
733 dm_switchgroup(char * mapname, int index)
735 return dm_groupmsg("switch", mapname, index);
739 dm_enablegroup(char * mapname, int index)
741 return dm_groupmsg("enable", mapname, index);
745 dm_disablegroup(char * mapname, int index)
747 return dm_groupmsg("disable", mapname, index);
751 dm_get_maps (vector mp)
753 struct multipath * mpp;
757 struct dm_names *names;
763 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
766 dm_task_no_open_count(dmt);
768 if (!dm_task_run(dmt))
771 if (!(names = dm_task_get_names(dmt)))
775 r = 0; /* this is perfectly valid */
780 info = dm_type(names->name, TGT_MPATH);
785 mpp = alloc_multipath();
790 mpp->alias = STRDUP(names->name);
796 if (dm_get_map(names->name, &mpp->size, mpp->params))
799 if (dm_get_status(names->name, mpp->status))
802 dm_get_uuid(names->name, mpp->wwid);
803 dm_get_info(names->name, &mpp->dmi);
806 if (!vector_alloc_slot(mp))
809 vector_set_slot(mp, mpp);
813 names = (void *) names + next;
819 free_multipath(mpp, KEEP_PATHS);
821 dm_task_destroy (dmt);
826 dm_get_name(char *uuid)
830 char *prefixed_uuid, *name = NULL;
833 dmt = dm_task_create(DM_DEVICE_INFO);
837 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
838 if (!prefixed_uuid) {
839 condlog(0, "cannot create prefixed uuid : %s\n",
843 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
844 if (!dm_task_set_uuid(dmt, prefixed_uuid))
847 if (!dm_task_run(dmt))
850 if (!dm_task_get_info(dmt, &info) || !info.exists)
853 nametmp = dm_task_get_name(dmt);
854 if (nametmp && strlen(nametmp)) {
855 name = MALLOC(strlen(nametmp) + 1);
857 strcpy(name, nametmp);
859 condlog(2, "%s: no device-mapper name found", uuid);
865 dm_task_destroy(dmt);
871 dm_geteventnr (char *name)
876 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
879 if (!dm_task_set_name(dmt, name))
882 dm_task_no_open_count(dmt);
884 if (!dm_task_run(dmt))
887 if (!dm_task_get_info(dmt, &info)) {
898 dm_task_destroy(dmt);
900 return info.event_nr;
904 dm_mapname(int major, int minor)
906 char * response = NULL;
910 int loop = MAX_WAIT * LOOPS_PER_SEC;
912 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
915 if (!dm_task_set_major(dmt, major) ||
916 !dm_task_set_minor(dmt, minor))
919 dm_task_no_open_count(dmt);
922 * device map might not be ready when we get here from
923 * daemon uev_trigger -> uev_add_map
926 r = dm_task_run(dmt);
931 usleep(1000 * 1000 / LOOPS_PER_SEC);
935 condlog(0, "%i:%i: timeout fetching map name", major, minor);
939 map = dm_task_get_name(dmt);
940 if (map && strlen(map))
941 response = STRDUP((char *)dm_task_get_name(dmt));
943 dm_task_destroy(dmt);
946 dm_task_destroy(dmt);
947 condlog(0, "%i:%i: error fetching map name", major, minor);
952 dm_remove_partmaps (const char * mapname, int need_sync)
955 struct dm_names *names;
957 char params[PARAMS_SIZE];
958 unsigned long long size;
962 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
965 dm_task_no_open_count(dmt);
967 if (!dm_task_run(dmt))
970 if (!(names = dm_task_get_names(dmt)))
974 r = 0; /* this is perfectly valid */
978 if (dm_dev_t(mapname, &dev_t[0], 32))
984 * if devmap target is "linear"
986 (dm_type(names->name, TGT_PART) > 0) &&
989 * and the multipath mapname and the part mapname start
992 !strncmp(names->name, mapname, strlen(mapname)) &&
995 * and the opencount is 0 for us to allow removal
997 !dm_get_opencount(names->name) &&
1000 * and we can fetch the map table from the kernel
1002 !dm_get_map(names->name, &size, ¶ms[0]) &&
1005 * and the table maps over the multipath map
1007 strstr(params, dev_t)
1010 * then it's a kpartx generated partition.
1013 condlog(4, "partition map %s removed",
1015 dm_simplecmd_flush(DM_DEVICE_REMOVE, names->name, need_sync);
1019 names = (void *) names + next;
1024 dm_task_destroy (dmt);
1028 static struct dm_info *
1031 return MALLOC(sizeof(struct dm_info));
1035 dm_get_info (char * mapname, struct dm_info ** dmi)
1038 struct dm_task *dmt = NULL;
1044 *dmi = alloc_dminfo();
1049 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
1052 if (!dm_task_set_name(dmt, mapname))
1055 dm_task_no_open_count(dmt);
1057 if (!dm_task_run(dmt))
1060 if (!dm_task_get_info(dmt, *dmi))
1066 memset(*dmi, 0, sizeof(struct dm_info));
1072 dm_task_destroy(dmt);
1078 dm_rename_partmaps (char * old, char * new)
1080 struct dm_task *dmt;
1081 struct dm_names *names;
1083 char buff[PARAMS_SIZE];
1084 unsigned long long size;
1088 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1091 dm_task_no_open_count(dmt);
1093 if (!dm_task_run(dmt))
1096 if (!(names = dm_task_get_names(dmt)))
1100 r = 0; /* this is perfectly valid */
1104 if (dm_dev_t(old, &dev_t[0], 32))
1110 * if devmap target is "linear"
1112 (dm_type(names->name, TGT_PART) > 0) &&
1115 * and the multipath mapname and the part mapname start
1118 !strncmp(names->name, old, strlen(old)) &&
1121 * and we can fetch the map table from the kernel
1123 !dm_get_map(names->name, &size, &buff[0]) &&
1126 * and the table maps over the multipath map
1131 * then it's a kpartx generated partition.
1134 snprintf(buff, PARAMS_SIZE, "%s%s",
1135 new, names->name + strlen(old));
1136 dm_rename(names->name, buff);
1137 condlog(4, "partition map %s renamed",
1142 names = (void *) names + next;
1147 dm_task_destroy (dmt);
1152 dm_rename (char * old, char * new)
1155 struct dm_task *dmt;
1157 if (dm_rename_partmaps(old, new))
1160 if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1163 if (!dm_task_set_name(dmt, old))
1166 if (!dm_task_set_newname(dmt, new))
1169 dm_task_no_open_count(dmt);
1171 if (!dm_task_set_cookie(dmt, &conf->cookie, 0))
1173 if (!dm_task_run(dmt))
1178 dm_task_destroy(dmt);
1182 int dm_setgeometry(struct multipath *mpp)
1184 struct dm_task *dmt;
1186 char heads[4], sectors[4];
1187 char cylinders[10], start[32];
1193 pp = first_path(mpp);
1195 condlog(3, "%s: no path for geometry", mpp->alias);
1198 if (pp->geom.cylinders == 0 ||
1199 pp->geom.heads == 0 ||
1200 pp->geom.sectors == 0) {
1201 condlog(3, "%s: invalid geometry on %s", mpp->alias, pp->dev);
1205 if (!(dmt = dm_task_create(DM_DEVICE_SET_GEOMETRY)))
1208 if (!dm_task_set_name(dmt, mpp->alias))
1211 dm_task_no_open_count(dmt);
1213 /* What a sick interface ... */
1214 snprintf(heads, 4, "%u", pp->geom.heads);
1215 snprintf(sectors, 4, "%u", pp->geom.sectors);
1216 snprintf(cylinders, 10, "%u", pp->geom.cylinders);
1217 snprintf(start, 32, "%lu", pp->geom.start);
1218 if (!dm_task_set_geometry(dmt, cylinders, heads, sectors, start)) {
1219 condlog(3, "%s: Failed to set geometry", mpp->alias);
1223 r = dm_task_run(dmt);
1225 dm_task_destroy(dmt);