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>
13 #include <linux/kdev_t.h>
22 #include "devmapper.h"
25 #include "log_pthread.h"
26 #include <sys/types.h>
30 #define LOOPS_PER_SEC 5
32 #define UUID_PREFIX "mpath-"
33 #define UUID_PREFIX_LEN 6
36 dm_write_log (int level, const char *file, int line, const char *f, ...)
44 thres = (conf) ? conf->verbosity : 0;
45 if (thres <= 3 || level > thres)
50 time_t t = time(NULL);
51 struct tm *tb = localtime(&t);
54 strftime(buff, sizeof(buff), "%b %d %H:%M:%S", tb);
55 buff[sizeof(buff)-1] = '\0';
57 fprintf(stdout, "%s | ", buff);
58 fprintf(stdout, "libdevmapper: %s(%i): ", file, line);
59 vfprintf(stdout, f, ap);
60 fprintf(stdout, "\n");
62 condlog(level, "libdevmapper: %s(%i): ", file, line);
63 log_safe(level + 3, f, ap);
72 dm_log_init(&dm_write_log);
73 dm_log_init_verbose(conf ? conf->verbosity + 3 : 0);
81 int minv[3] = {1, 2, 8};
83 dm_get_library_version(version, sizeof(version));
84 condlog(3, "libdevmapper version %s", version);
85 sscanf(version, "%d.%d.%d ", &v[0], &v[1], &v[2]);
87 if ((v[0] > minv[0]) ||
88 ((v[0] == minv[0]) && (v[1] > minv[1])) ||
89 ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2])))
91 condlog(0, "libdevmapper version must be >= %d.%.2d.%.2d",
92 minv[0], minv[1], minv[2]);
97 dm_drvprereq (char * str)
101 struct dm_versions *target;
102 struct dm_versions *last_target;
103 int minv[3] = {1, 0, 3};
106 if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
109 dm_task_no_open_count(dmt);
111 if (!dm_task_run(dmt)) {
112 condlog(0, "Can not communicate with kernel DM");
115 target = dm_task_get_versions(dmt);
118 last_target = target;
119 if (!strncmp(str, target->name, strlen(str))) {
123 target = (void *) target + target->next;
124 } while (last_target != target);
127 condlog(0, "DM multipath kernel driver not loaded");
131 if ((v[0] > minv[0]) ||
132 ((v[0] == minv[0]) && (v[1] > minv[1])) ||
133 ((v[0] == minv[0]) && (v[1] == minv[1]) && (v[2] >= minv[2]))) {
137 condlog(0, "DM multipath kernel driver must be >= %u.%.2u.%.2u",
138 minv[0], minv[1], minv[2]);
140 dm_task_destroy(dmt);
149 return dm_drvprereq(TGT_MPATH);
153 dm_simplecmd (int task, const char *name) {
157 if (!(dmt = dm_task_create (task)))
160 if (!dm_task_set_name (dmt, name))
163 dm_task_no_open_count(dmt);
164 dm_task_skip_lockfs(dmt); /* for DM_DEVICE_RESUME */
165 #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_addmap (int task, const char *name, const char *target,
178 const char *params, unsigned long long size, const char *uuid,
182 char *prefixed_uuid = NULL;
184 if (!(dmt = dm_task_create (task)))
187 if (!dm_task_set_name (dmt, name))
190 if (!dm_task_add_target (dmt, 0, size, target, params))
197 prefixed_uuid = MALLOC(UUID_PREFIX_LEN + strlen(uuid) + 1);
198 if (!prefixed_uuid) {
199 condlog(0, "cannot create prefixed uuid : %s\n",
203 sprintf(prefixed_uuid, UUID_PREFIX "%s", uuid);
204 if (!dm_task_set_uuid(dmt, prefixed_uuid))
208 dm_task_no_open_count(dmt);
210 r = dm_task_run (dmt);
217 dm_task_destroy (dmt);
223 _dm_addmap_create (const char *name, const char *params,
224 unsigned long long size, const char *uuid, int ro) {
226 r = dm_addmap(DM_DEVICE_CREATE, name, TGT_MPATH, params, size, uuid,
229 * DM_DEVICE_CREATE is actually DM_DEV_CREATE + DM_TABLE_LOAD.
230 * Failing the second part leaves an empty map. Clean it up.
232 if (!r && dm_map_present(name)) {
233 condlog(3, "%s: failed to load map (a path might be in use)",
244 dm_addmap_create (const char *name, const char *params,
245 unsigned long long size, const char *uuid) {
246 return _dm_addmap_create(name, params, size, uuid, ADDMAP_RW);
250 dm_addmap_create_ro (const char *name, const char *params,
251 unsigned long long size, const char *uuid) {
252 return _dm_addmap_create(name, params, size, uuid, ADDMAP_RO);
256 dm_addmap_reload (const char *name, const char *params,
257 unsigned long long size, const char *uuid) {
258 return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
263 dm_addmap_reload_ro (const char *name, const char *params,
264 unsigned long long size, const char *uuid) {
265 return dm_addmap(DM_DEVICE_RELOAD, name, TGT_MPATH, params, size, uuid,
270 dm_map_present (const char * str)
276 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
279 if (!dm_task_set_name(dmt, str))
282 dm_task_no_open_count(dmt);
284 if (!dm_task_run(dmt))
287 if (!dm_task_get_info(dmt, &info))
293 dm_task_destroy(dmt);
298 dm_get_map(char * name, unsigned long long * size, char * outparams)
303 uint64_t start, length;
304 char *target_type = NULL;
307 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
310 if (!dm_task_set_name(dmt, name))
313 dm_task_no_open_count(dmt);
315 if (!dm_task_run(dmt))
318 /* Fetch 1st target */
319 next = dm_get_next_target(dmt, next, &start, &length,
320 &target_type, ¶ms);
325 if (snprintf(outparams, PARAMS_SIZE, "%s", params) <= PARAMS_SIZE)
328 dm_task_destroy(dmt);
333 dm_get_uuid(char *name, char *uuid)
339 dmt = dm_task_create(DM_DEVICE_INFO);
343 if (!dm_task_set_name (dmt, name))
346 if (!dm_task_run(dmt))
349 uuidtmp = dm_task_get_uuid(dmt);
351 if (!strncmp(uuidtmp, UUID_PREFIX, UUID_PREFIX_LEN))
352 strcpy(uuid, uuidtmp + UUID_PREFIX_LEN);
354 strcpy(uuid, uuidtmp);
361 dm_task_destroy(dmt);
366 dm_get_status(char * name, char * outstatus)
371 uint64_t start, length;
375 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
378 if (!dm_task_set_name(dmt, name))
381 dm_task_no_open_count(dmt);
383 if (!dm_task_run(dmt))
386 /* Fetch 1st target */
387 next = dm_get_next_target(dmt, next, &start, &length,
388 &target_type, &status);
390 if (snprintf(outstatus, PARAMS_SIZE, "%s", status) <= PARAMS_SIZE)
394 condlog(0, "%s: error getting map status string", name);
396 dm_task_destroy(dmt);
407 dm_type(const char * name, char * type)
412 uint64_t start, length;
413 char *target_type = NULL;
416 if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
419 if (!dm_task_set_name(dmt, name))
422 dm_task_no_open_count(dmt);
424 if (!dm_task_run(dmt))
427 /* Fetch 1st target */
428 next = dm_get_next_target(dmt, next, &start, &length,
429 &target_type, ¶ms);
433 else if (!strcmp(target_type, type))
437 dm_task_destroy(dmt);
442 dm_dev_t (const char * mapname, char * dev_t, int len)
448 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
451 if (!dm_task_set_name(dmt, mapname))
454 if (!dm_task_run(dmt))
457 if (!dm_task_get_info(dmt, &info))
461 if (snprintf(dev_t, len, "%i:%i", info.major, info.minor) > len)
466 dm_task_destroy(dmt);
471 dm_get_opencount (const char * mapname)
477 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
480 if (!dm_task_set_name(dmt, mapname))
483 if (!dm_task_run(dmt))
486 if (!dm_task_get_info(dmt, &info))
491 dm_task_destroy(dmt);
496 dm_get_minor (char * mapname)
502 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
505 if (!dm_task_set_name(dmt, mapname))
508 if (!dm_task_run(dmt))
511 if (!dm_task_get_info(dmt, &info))
516 dm_task_destroy(dmt);
521 dm_flush_map (const char * mapname)
525 if (!dm_map_present(mapname))
528 if (dm_type(mapname, TGT_MPATH) <= 0)
529 return 0; /* nothing to do */
531 if (dm_remove_partmaps(mapname))
534 if (dm_get_opencount(mapname)) {
535 condlog(2, "%s: map in use", mapname);
539 r = dm_simplecmd(DM_DEVICE_REMOVE, mapname);
542 condlog(4, "multipath map %s removed", mapname);
553 struct dm_names *names;
556 if (!(dmt = dm_task_create (DM_DEVICE_LIST)))
559 dm_task_no_open_count(dmt);
561 if (!dm_task_run (dmt))
564 if (!(names = dm_task_get_names (dmt)))
571 r |= dm_flush_map(names->name);
573 names = (void *) names + next;
577 dm_task_destroy (dmt);
582 dm_message(char * mapname, char * message)
587 if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
590 if (!dm_task_set_name(dmt, mapname))
593 if (!dm_task_set_sector(dmt, 0))
596 if (!dm_task_set_message(dmt, message))
599 dm_task_no_open_count(dmt);
601 if (!dm_task_run(dmt))
607 condlog(0, "DM message failed [%s]", message);
609 dm_task_destroy(dmt);
614 dm_fail_path(char * mapname, char * path)
618 if (snprintf(message, 32, "fail_path %s\n", path) > 32)
621 return dm_message(mapname, message);
625 dm_reinstate_path(char * mapname, char * path)
629 if (snprintf(message, 32, "reinstate_path %s\n", path) > 32)
632 return dm_message(mapname, message);
636 dm_queue_if_no_path(char *mapname, int enable)
641 message = "queue_if_no_path\n";
643 message = "fail_if_no_path\n";
645 return dm_message(mapname, message);
649 dm_set_pg_timeout(char *mapname, int timeout_val)
653 if (snprintf(message, 24, "set_pg_timeout %d", timeout_val) >= 24)
655 return dm_message(mapname, message);
659 dm_groupmsg (char * msg, char * mapname, int index)
663 if (snprintf(message, 32, "%s_group %i\n", msg, index) > 32)
666 return dm_message(mapname, message);
670 dm_switchgroup(char * mapname, int index)
672 return dm_groupmsg("switch", mapname, index);
676 dm_enablegroup(char * mapname, int index)
678 return dm_groupmsg("enable", mapname, index);
682 dm_disablegroup(char * mapname, int index)
684 return dm_groupmsg("disable", mapname, index);
688 dm_get_maps (vector mp)
690 struct multipath * mpp;
694 struct dm_names *names;
700 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
703 dm_task_no_open_count(dmt);
705 if (!dm_task_run(dmt))
708 if (!(names = dm_task_get_names(dmt)))
712 r = 0; /* this is perfectly valid */
717 info = dm_type(names->name, TGT_MPATH);
722 mpp = alloc_multipath();
727 mpp->alias = STRDUP(names->name);
733 if (dm_get_map(names->name, &mpp->size, mpp->params))
736 if (dm_get_status(names->name, mpp->status))
739 dm_get_uuid(names->name, mpp->wwid);
740 dm_get_info(names->name, &mpp->dmi);
743 if (!vector_alloc_slot(mp))
746 vector_set_slot(mp, mpp);
750 names = (void *) names + next;
756 free_multipath(mpp, KEEP_PATHS);
758 dm_task_destroy (dmt);
763 dm_get_name(char *uuid, char *name)
766 struct multipath *mpp;
769 vec = vector_alloc();
774 if (dm_get_maps(vec)) {
778 vector_foreach_slot(vec, mpp, i) {
779 if (!strcmp(uuid, mpp->wwid)) {
780 strcpy(name, mpp->alias);
786 vector_foreach_slot(vec, mpp, i) {
787 free_multipath(mpp, KEEP_PATHS);
794 dm_geteventnr (char *name)
799 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
802 if (!dm_task_set_name(dmt, name))
805 dm_task_no_open_count(dmt);
807 if (!dm_task_run(dmt))
810 if (!dm_task_get_info(dmt, &info)) {
821 dm_task_destroy(dmt);
823 return info.event_nr;
827 dm_mapname(int major, int minor)
829 char * response = NULL;
833 int loop = MAX_WAIT * LOOPS_PER_SEC;
835 if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
838 if (!dm_task_set_major(dmt, major) ||
839 !dm_task_set_minor(dmt, minor))
842 dm_task_no_open_count(dmt);
845 * device map might not be ready when we get here from
846 * daemon uev_trigger -> uev_add_map
849 r = dm_task_run(dmt);
854 usleep(1000 * 1000 / LOOPS_PER_SEC);
858 condlog(0, "%i:%i: timeout fetching map name", major, minor);
862 map = dm_task_get_name(dmt);
863 if (map && strlen(map))
864 response = STRDUP((char *)dm_task_get_name(dmt));
866 dm_task_destroy(dmt);
869 dm_task_destroy(dmt);
870 condlog(0, "%i:%i: error fetching map name", major, minor);
875 dm_remove_partmaps (const char * mapname)
878 struct dm_names *names;
880 char params[PARAMS_SIZE];
881 unsigned long long size;
885 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
888 dm_task_no_open_count(dmt);
890 if (!dm_task_run(dmt))
893 if (!(names = dm_task_get_names(dmt)))
897 r = 0; /* this is perfectly valid */
901 if (dm_dev_t(mapname, &dev_t[0], 32))
907 * if devmap target is "linear"
909 (dm_type(names->name, TGT_PART) > 0) &&
912 * and the multipath mapname and the part mapname start
915 !strncmp(names->name, mapname, strlen(mapname)) &&
918 * and the opencount is 0 for us to allow removal
920 !dm_get_opencount(names->name) &&
923 * and we can fetch the map table from the kernel
925 !dm_get_map(names->name, &size, ¶ms[0]) &&
928 * and the table maps over the multipath map
930 strstr(params, dev_t)
933 * then it's a kpartx generated partition.
936 condlog(4, "partition map %s removed",
938 dm_simplecmd(DM_DEVICE_REMOVE, names->name);
942 names = (void *) names + next;
947 dm_task_destroy (dmt);
951 static struct dm_info *
954 return MALLOC(sizeof(struct dm_info));
958 dm_get_info (char * mapname, struct dm_info ** dmi)
961 struct dm_task *dmt = NULL;
967 *dmi = alloc_dminfo();
972 if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
975 if (!dm_task_set_name(dmt, mapname))
978 dm_task_no_open_count(dmt);
980 if (!dm_task_run(dmt))
983 if (!dm_task_get_info(dmt, *dmi))
989 memset(*dmi, 0, sizeof(struct dm_info));
992 dm_task_destroy(dmt);
998 dm_rename_partmaps (char * old, char * new)
1000 struct dm_task *dmt;
1001 struct dm_names *names;
1003 char buff[PARAMS_SIZE];
1004 unsigned long long size;
1008 if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
1011 dm_task_no_open_count(dmt);
1013 if (!dm_task_run(dmt))
1016 if (!(names = dm_task_get_names(dmt)))
1020 r = 0; /* this is perfectly valid */
1024 if (dm_dev_t(old, &dev_t[0], 32))
1030 * if devmap target is "linear"
1032 (dm_type(names->name, TGT_PART) > 0) &&
1035 * and the multipath mapname and the part mapname start
1038 !strncmp(names->name, old, strlen(old)) &&
1041 * and we can fetch the map table from the kernel
1043 !dm_get_map(names->name, &size, &buff[0]) &&
1046 * and the table maps over the multipath map
1051 * then it's a kpartx generated partition.
1054 snprintf(buff, PARAMS_SIZE, "%s%s",
1055 new, names->name + strlen(old));
1056 dm_rename(names->name, buff);
1057 condlog(4, "partition map %s renamed",
1062 names = (void *) names + next;
1067 dm_task_destroy (dmt);
1072 dm_rename (char * old, char * new)
1075 struct dm_task *dmt;
1077 if (dm_rename_partmaps(old, new))
1080 if (!(dmt = dm_task_create(DM_DEVICE_RENAME)))
1083 if (!dm_task_set_name(dmt, old))
1086 if (!dm_task_set_newname(dmt, new))
1089 dm_task_no_open_count(dmt);
1091 if (!dm_task_run(dmt))
1096 dm_task_destroy(dmt);