a4a2c44768f9fdeeaedefe2d00a0bb7a30ea2ecd
[multipath-tools/.git] / libmultipath / configure.c
1 /*
2  * Copyright (c) 2003, 2004, 2005 Christophe Varoqui
3  * Copyright (c) 2005 Benjamin Marzinski, Redhat
4  * Copyright (c) 2005 Kiyoshi Ueda, NEC
5  * Copyright (c) 2005 Patrick Caulfield, Redhat
6  * Copyright (c) 2005 Edward Goggin, EMC
7  */
8
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <unistd.h>
12 #include <string.h>
13 #include <sys/file.h>
14 #include <errno.h>
15 #include <libdevmapper.h>
16 #include <libudev.h>
17 #include <mpath_cmd.h>
18
19 #include "checkers.h"
20 #include "vector.h"
21 #include "memory.h"
22 #include "devmapper.h"
23 #include "defaults.h"
24 #include "structs.h"
25 #include "structs_vec.h"
26 #include "dmparser.h"
27 #include "config.h"
28 #include "blacklist.h"
29 #include "propsel.h"
30 #include "discovery.h"
31 #include "debug.h"
32 #include "switchgroup.h"
33 #include "print.h"
34 #include "configure.h"
35 #include "pgpolicies.h"
36 #include "dict.h"
37 #include "alias.h"
38 #include "prio.h"
39 #include "util.h"
40 #include "uxsock.h"
41 #include "wwids.h"
42
43 /* group paths in pg by host adapter
44  */
45 int group_by_host_adapter(struct pathgroup *pgp, vector adapters)
46 {
47         struct adapter_group *agp;
48         struct host_group *hgp;
49         struct path *pp, *pp1;
50         char adapter_name1[SLOT_NAME_SIZE];
51         char adapter_name2[SLOT_NAME_SIZE];
52         int i, j;
53         int found_hostgroup = 0;
54
55         while (VECTOR_SIZE(pgp->paths) > 0) {
56
57                 pp = VECTOR_SLOT(pgp->paths, 0);
58
59                 if (sysfs_get_host_adapter_name(pp, adapter_name1))
60                         goto out;
61                 /* create a new host adapter group
62                  */
63                 agp = alloc_adaptergroup();
64                 if (!agp)
65                         goto out;
66                 agp->pgp = pgp;
67
68                 strncpy(agp->adapter_name, adapter_name1, SLOT_NAME_SIZE);
69                 store_adaptergroup(adapters, agp);
70
71                 /* create a new host port group
72                  */
73                 hgp = alloc_hostgroup();
74                 if (!hgp)
75                         goto out;
76                 if (store_hostgroup(agp->host_groups, hgp))
77                         goto out;
78
79                 hgp->host_no = pp->sg_id.host_no;
80                 agp->num_hosts++;
81                 if (store_path(hgp->paths, pp))
82                         goto out;
83
84                 hgp->num_paths++;
85                 /* delete path from path group
86                  */
87                 vector_del_slot(pgp->paths, 0);
88
89                 /* add all paths belonging to same host adapter
90                  */
91                 vector_foreach_slot(pgp->paths, pp1, i) {
92                         if (sysfs_get_host_adapter_name(pp1, adapter_name2))
93                                 goto out;
94                         if (strcmp(adapter_name1, adapter_name2) == 0) {
95                                 found_hostgroup = 0;
96                                 vector_foreach_slot(agp->host_groups, hgp, j) {
97                                         if (hgp->host_no == pp1->sg_id.host_no) {
98                                                 if (store_path(hgp->paths, pp1))
99                                                         goto out;
100                                                 hgp->num_paths++;
101                                                 found_hostgroup = 1;
102                                                 break;
103                                         }
104                                 }
105                                 if (!found_hostgroup) {
106                                         /* this path belongs to new host port
107                                          * within this adapter
108                                          */
109                                         hgp = alloc_hostgroup();
110                                         if (!hgp)
111                                                 goto out;
112
113                                         if (store_hostgroup(agp->host_groups, hgp))
114                                                 goto out;
115
116                                         agp->num_hosts++;
117                                         if (store_path(hgp->paths, pp1))
118                                                 goto out;
119
120                                         hgp->host_no = pp1->sg_id.host_no;
121                                         hgp->num_paths++;
122                                 }
123                                 /* delete paths from original path_group
124                                  * as they are added into adapter group now
125                                  */
126                                 vector_del_slot(pgp->paths, i);
127                                 i--;
128                         }
129                 }
130         }
131         return 0;
132
133 out:    /* add back paths into pg as re-ordering failed
134          */
135         vector_foreach_slot(adapters, agp, i) {
136                         vector_foreach_slot(agp->host_groups, hgp, j) {
137                                 while (VECTOR_SIZE(hgp->paths) > 0) {
138                                         pp = VECTOR_SLOT(hgp->paths, 0);
139                                         if (store_path(pgp->paths, pp))
140                                                 condlog(3, "failed to restore "
141                                                 "path %s into path group",
142                                                  pp->dev);
143                                         vector_del_slot(hgp->paths, 0);
144                                 }
145                         }
146                 }
147         free_adaptergroup(adapters);
148         return 1;
149 }
150
151 /* re-order paths in pg by alternating adapters and host ports
152  * for optimized selection
153  */
154 int order_paths_in_pg_by_alt_adapters(struct pathgroup *pgp, vector adapters,
155                  int total_paths)
156 {
157         int next_adapter_index = 0;
158         struct adapter_group *agp;
159         struct host_group *hgp;
160         struct path *pp;
161
162         while (total_paths > 0) {
163                 agp = VECTOR_SLOT(adapters, next_adapter_index);
164                 if (!agp) {
165                         condlog(0, "can't get adapter group %d", next_adapter_index);
166                         return 1;
167                 }
168
169                 hgp = VECTOR_SLOT(agp->host_groups, agp->next_host_index);
170                 if (!hgp) {
171                         condlog(0, "can't get host group %d of adapter group %d", next_adapter_index, agp->next_host_index);
172                         return 1;
173                 }
174
175                 if (!hgp->num_paths) {
176                         agp->next_host_index++;
177                         agp->next_host_index %= agp->num_hosts;
178                         next_adapter_index++;
179                         next_adapter_index %= VECTOR_SIZE(adapters);
180                         continue;
181                 }
182
183                 pp  = VECTOR_SLOT(hgp->paths, 0);
184
185                 if (store_path(pgp->paths, pp))
186                         return 1;
187
188                 total_paths--;
189
190                 vector_del_slot(hgp->paths, 0);
191
192                 hgp->num_paths--;
193
194                 agp->next_host_index++;
195                 agp->next_host_index %= agp->num_hosts;
196                 next_adapter_index++;
197                 next_adapter_index %= VECTOR_SIZE(adapters);
198         }
199
200         /* all paths are added into path_group
201          * in crafted child order
202          */
203         return 0;
204 }
205
206 /* round-robin: order paths in path group to alternate
207  * between all host adapters
208  */
209 int rr_optimize_path_order(struct pathgroup *pgp)
210 {
211         vector adapters;
212         struct path *pp;
213         int total_paths;
214         int i;
215
216         total_paths = VECTOR_SIZE(pgp->paths);
217         vector_foreach_slot(pgp->paths, pp, i) {
218                 if (pp->sg_id.proto_id != SCSI_PROTOCOL_FCP &&
219                         pp->sg_id.proto_id != SCSI_PROTOCOL_SAS &&
220                         pp->sg_id.proto_id != SCSI_PROTOCOL_ISCSI &&
221                         pp->sg_id.proto_id != SCSI_PROTOCOL_SRP) {
222                         /* return success as default path order
223                          * is maintained in path group
224                          */
225                         return 0;
226                 }
227         }
228         adapters = vector_alloc();
229         if (!adapters)
230                 return 0;
231
232         /* group paths in path group by host adapters
233          */
234         if (group_by_host_adapter(pgp, adapters)) {
235                 /* already freed adapters */
236                 condlog(3, "Failed to group paths by adapters");
237                 return 0;
238         }
239
240         /* re-order paths in pg to alternate between adapters and host ports
241          */
242         if (order_paths_in_pg_by_alt_adapters(pgp, adapters, total_paths)) {
243                 condlog(3, "Failed to re-order paths in pg by adapters "
244                         "and host ports");
245                 free_adaptergroup(adapters);
246                 /* return failure as original paths are
247                  * removed form pgp
248                  */
249                 return 1;
250         }
251
252         free_adaptergroup(adapters);
253         return 0;
254 }
255
256 extern int
257 setup_map (struct multipath * mpp, char * params, int params_size)
258 {
259         struct pathgroup * pgp;
260         int i;
261
262         /*
263          * don't bother if devmap size is unknown
264          */
265         if (mpp->size <= 0) {
266                 condlog(3, "%s: devmap size is unknown", mpp->alias);
267                 return 1;
268         }
269
270         /*
271          * free features, selector, and hwhandler properties if they are being reused
272          */
273         free_multipath_attributes(mpp);
274
275         /*
276          * properties selectors
277          */
278         select_pgfailback(mpp);
279         select_pgpolicy(mpp);
280         select_selector(mpp);
281         select_features(mpp);
282         select_hwhandler(mpp);
283         select_rr_weight(mpp);
284         select_minio(mpp);
285         select_no_path_retry(mpp);
286         select_mode(mpp);
287         select_uid(mpp);
288         select_gid(mpp);
289         select_fast_io_fail(mpp);
290         select_dev_loss(mpp);
291         select_reservation_key(mpp);
292         select_retain_hwhandler(mpp);
293         select_deferred_remove(mpp);
294         select_delay_watch_checks(mpp);
295         select_delay_wait_checks(mpp);
296
297         sysfs_set_scsi_tmo(mpp);
298         /*
299          * assign paths to path groups -- start with no groups and all paths
300          * in mpp->paths
301          */
302         if (mpp->pg) {
303                 vector_foreach_slot (mpp->pg, pgp, i)
304                         free_pathgroup(pgp, KEEP_PATHS);
305
306                 vector_free(mpp->pg);
307                 mpp->pg = NULL;
308         }
309         if (mpp->pgpolicyfn && mpp->pgpolicyfn(mpp))
310                 return 1;
311
312         mpp->nr_active = pathcount(mpp, PATH_UP) + pathcount(mpp, PATH_GHOST);
313
314         /*
315          * ponders each path group and determine highest prio pg
316          * to switch over (default to first)
317          */
318         mpp->bestpg = select_path_group(mpp);
319
320         /* re-order paths in all path groups in an optimized way
321          * for round-robin path selectors to get maximum throughput.
322          */
323         if (!strncmp(mpp->selector, "round-robin", 11)) {
324                 vector_foreach_slot(mpp->pg, pgp, i) {
325                         if (VECTOR_SIZE(pgp->paths) <= 2)
326                                 continue;
327                         if (rr_optimize_path_order(pgp)) {
328                                 condlog(2, "cannot re-order paths for "
329                                         "optimization: %s",
330                                         mpp->alias);
331                                 return 1;
332                         }
333                 }
334         }
335
336         /*
337          * transform the mp->pg vector of vectors of paths
338          * into a mp->params strings to feed the device-mapper
339          */
340         if (assemble_map(mpp, params, params_size)) {
341                 condlog(0, "%s: problem assembing map", mpp->alias);
342                 return 1;
343         }
344         return 0;
345 }
346
347 static void
348 compute_pgid(struct pathgroup * pgp)
349 {
350         struct path * pp;
351         int i;
352
353         vector_foreach_slot (pgp->paths, pp, i)
354                 pgp->id ^= (long)pp;
355 }
356
357 static int
358 pgcmp (struct multipath * mpp, struct multipath * cmpp)
359 {
360         int i, j;
361         struct pathgroup * pgp;
362         struct pathgroup * cpgp;
363         int r = 0;
364
365         if (!mpp)
366                 return 0;
367
368         vector_foreach_slot (mpp->pg, pgp, i) {
369                 compute_pgid(pgp);
370
371                 vector_foreach_slot (cmpp->pg, cpgp, j) {
372                         if (pgp->id == cpgp->id &&
373                             !pathcmp(pgp, cpgp)) {
374                                 r = 0;
375                                 break;
376                         }
377                         r++;
378                 }
379                 if (r)
380                         return r;
381         }
382         return r;
383 }
384
385 static void
386 select_action (struct multipath * mpp, vector curmp, int force_reload)
387 {
388         struct multipath * cmpp;
389         struct multipath * cmpp_by_name;
390
391         cmpp = find_mp_by_wwid(curmp, mpp->wwid);
392         cmpp_by_name = find_mp_by_alias(curmp, mpp->alias);
393
394         if (!cmpp_by_name) {
395                 if (cmpp) {
396                         condlog(2, "%s: rename %s to %s", mpp->wwid,
397                                 cmpp->alias, mpp->alias);
398                         strncpy(mpp->alias_old, cmpp->alias, WWID_SIZE);
399                         mpp->action = ACT_RENAME;
400                         if (force_reload)
401                                 mpp->action = ACT_FORCERENAME;
402                         return;
403                 }
404                 mpp->action = ACT_CREATE;
405                 condlog(3, "%s: set ACT_CREATE (map does not exist)",
406                         mpp->alias);
407                 return;
408         }
409
410         if (!cmpp) {
411                 condlog(2, "%s: remove (wwid changed)", mpp->alias);
412                 dm_flush_map(mpp->alias);
413                 strncpy(cmpp_by_name->wwid, mpp->wwid, WWID_SIZE);
414                 drop_multipath(curmp, cmpp_by_name->wwid, KEEP_PATHS);
415                 mpp->action = ACT_CREATE;
416                 condlog(3, "%s: set ACT_CREATE (map wwid change)",
417                         mpp->alias);
418                 return;
419         }
420
421         if (cmpp != cmpp_by_name) {
422                 condlog(2, "%s: unable to rename %s to %s (%s is used by %s)",
423                         mpp->wwid, cmpp->alias, mpp->alias,
424                         mpp->alias, cmpp_by_name->wwid);
425                 /* reset alias to existing alias */
426                 FREE(mpp->alias);
427                 mpp->alias = STRDUP(cmpp->alias);
428                 mpp->action = ACT_NOTHING;
429                 return;
430         }
431
432         if (pathcount(mpp, PATH_UP) == 0) {
433                 mpp->action = ACT_NOTHING;
434                 condlog(3, "%s: set ACT_NOTHING (no usable path)",
435                         mpp->alias);
436                 return;
437         }
438         if (force_reload) {
439                 mpp->action = ACT_RELOAD;
440                 condlog(3, "%s: set ACT_RELOAD (forced by user)",
441                         mpp->alias);
442                 return;
443         }
444         if (cmpp->size != mpp->size) {
445                 mpp->action = ACT_RESIZE;
446                 condlog(3, "%s: set ACT_RESIZE (size change)",
447                         mpp->alias);
448                 return;
449         }
450         if (!mpp->no_path_retry &&
451             (strlen(cmpp->features) != strlen(mpp->features) ||
452              strcmp(cmpp->features, mpp->features))) {
453                 mpp->action =  ACT_RELOAD;
454                 condlog(3, "%s: set ACT_RELOAD (features change)",
455                         mpp->alias);
456                 return;
457         }
458         if (mpp->retain_hwhandler != RETAIN_HWHANDLER_ON &&
459             (strlen(cmpp->hwhandler) != strlen(mpp->hwhandler) ||
460              strncmp(cmpp->hwhandler, mpp->hwhandler,
461                     strlen(mpp->hwhandler)))) {
462                 mpp->action = ACT_RELOAD;
463                 condlog(3, "%s: set ACT_RELOAD (hwhandler change)",
464                         mpp->alias);
465                 return;
466         }
467         if (!cmpp->selector || strncmp(cmpp->selector, mpp->selector,
468                     strlen(mpp->selector))) {
469                 mpp->action = ACT_RELOAD;
470                 condlog(3, "%s: set ACT_RELOAD (selector change)",
471                         mpp->alias);
472                 return;
473         }
474         if (cmpp->minio != mpp->minio) {
475                 mpp->action = ACT_RELOAD;
476                 condlog(3, "%s: set ACT_RELOAD (minio change, %u->%u)",
477                         mpp->alias, cmpp->minio, mpp->minio);
478                 return;
479         }
480         if (!cmpp->pg || VECTOR_SIZE(cmpp->pg) != VECTOR_SIZE(mpp->pg)) {
481                 mpp->action = ACT_RELOAD;
482                 condlog(3, "%s: set ACT_RELOAD (path group number change)",
483                         mpp->alias);
484                 return;
485         }
486         if (pgcmp(mpp, cmpp)) {
487                 mpp->action = ACT_RELOAD;
488                 condlog(3, "%s: set ACT_RELOAD (path group topology change)",
489                         mpp->alias);
490                 return;
491         }
492         if (cmpp->nextpg != mpp->bestpg) {
493                 mpp->action = ACT_SWITCHPG;
494                 condlog(3, "%s: set ACT_SWITCHPG (next path group change)",
495                         mpp->alias);
496                 return;
497         }
498         mpp->action = ACT_NOTHING;
499         condlog(3, "%s: set ACT_NOTHING (map unchanged)",
500                 mpp->alias);
501         return;
502 }
503
504 extern int
505 reinstate_paths (struct multipath * mpp)
506 {
507         int i, j;
508         struct pathgroup * pgp;
509         struct path * pp;
510
511         if (!mpp->pg)
512                 return 0;
513
514         vector_foreach_slot (mpp->pg, pgp, i) {
515                 if (!pgp->paths)
516                         continue;
517
518                 vector_foreach_slot (pgp->paths, pp, j) {
519                         if (pp->state != PATH_UP &&
520                             (pgp->status == PGSTATE_DISABLED ||
521                              pgp->status == PGSTATE_ACTIVE))
522                                 continue;
523
524                         if (pp->dmstate == PSTATE_FAILED) {
525                                 if (dm_reinstate_path(mpp->alias, pp->dev_t))
526                                         condlog(0, "%s: error reinstating",
527                                                 pp->dev);
528                         }
529                 }
530         }
531         return 0;
532 }
533
534 static int
535 lock_multipath (struct multipath * mpp, int lock)
536 {
537         struct pathgroup * pgp;
538         struct path * pp;
539         int i, j;
540         int x, y;
541
542         if (!mpp || !mpp->pg)
543                 return 0;
544
545         vector_foreach_slot (mpp->pg, pgp, i) {
546                 if (!pgp->paths)
547                         continue;
548                 vector_foreach_slot(pgp->paths, pp, j) {
549                         if (lock && flock(pp->fd, LOCK_SH | LOCK_NB) &&
550                             errno == EWOULDBLOCK)
551                                 goto fail;
552                         else if (!lock)
553                                 flock(pp->fd, LOCK_UN);
554                 }
555         }
556         return 0;
557 fail:
558         vector_foreach_slot (mpp->pg, pgp, x) {
559                 if (x > i)
560                         return 1;
561                 if (!pgp->paths)
562                         continue;
563                 vector_foreach_slot(pgp->paths, pp, y) {
564                         if (x == i && y >= j)
565                                 return 1;
566                         flock(pp->fd, LOCK_UN);
567                 }
568         }
569         return 1;
570 }
571
572 /*
573  * Return value:
574  */
575 #define DOMAP_RETRY     -1
576 #define DOMAP_FAIL      0
577 #define DOMAP_OK        1
578 #define DOMAP_EXIST     2
579 #define DOMAP_DRY       3
580
581 extern int
582 domap (struct multipath * mpp, char * params)
583 {
584         int r = DOMAP_FAIL;
585
586         /*
587          * last chance to quit before touching the devmaps
588          */
589         if (conf->cmd == CMD_DRY_RUN && mpp->action != ACT_NOTHING) {
590                 print_multipath_topology(mpp, conf->verbosity);
591                 return DOMAP_DRY;
592         }
593
594         if (mpp->action == ACT_CREATE &&
595             dm_map_present(mpp->alias)) {
596                 condlog(3, "%s: map already present", mpp->alias);
597                 mpp->action = ACT_RELOAD;
598         }
599
600         switch (mpp->action) {
601         case ACT_REJECT:
602         case ACT_NOTHING:
603                 return DOMAP_EXIST;
604
605         case ACT_SWITCHPG:
606                 dm_switchgroup(mpp->alias, mpp->bestpg);
607                 /*
608                  * we may have avoided reinstating paths because there where in
609                  * active or disabled PG. Now that the topology has changed,
610                  * retry.
611                  */
612                 reinstate_paths(mpp);
613                 return DOMAP_EXIST;
614
615         case ACT_CREATE:
616                 if (lock_multipath(mpp, 1)) {
617                         condlog(3, "%s: failed to create map (in use)",
618                                 mpp->alias);
619                         return DOMAP_RETRY;
620                 }
621
622                 r = dm_addmap_create(mpp, params);
623
624                 lock_multipath(mpp, 0);
625                 break;
626
627         case ACT_RELOAD:
628                 r = dm_addmap_reload(mpp, params, 0);
629                 break;
630
631         case ACT_RESIZE:
632                 r = dm_addmap_reload(mpp, params, 1);
633                 break;
634
635         case ACT_RENAME:
636                 r = dm_rename(mpp->alias_old, mpp->alias);
637                 break;
638
639         case ACT_FORCERENAME:
640                 r = dm_rename(mpp->alias_old, mpp->alias);
641                 if (r)
642                         r = dm_addmap_reload(mpp, params, 0);
643                 break;
644
645         default:
646                 break;
647         }
648
649         if (r == DOMAP_OK) {
650                 /*
651                  * DM_DEVICE_CREATE, DM_DEVICE_RENAME, or DM_DEVICE_RELOAD
652                  * succeeded
653                  */
654                 if (mpp->action == ACT_CREATE)
655                         remember_wwid(mpp->wwid);
656                 if (!conf->daemon) {
657                         /* multipath client mode */
658                         dm_switchgroup(mpp->alias, mpp->bestpg);
659                 } else  {
660                         /* multipath daemon mode */
661                         mpp->stat_map_loads++;
662                         condlog(2, "%s: load table [0 %llu %s %s]", mpp->alias,
663                                 mpp->size, TGT_MPATH, params);
664                         /*
665                          * Required action is over, reset for the stateful daemon.
666                          * But don't do it for creation as we use in the caller the
667                          * mpp->action to figure out whether to start the watievent checker.
668                          */
669                         if (mpp->action != ACT_CREATE)
670                                 mpp->action = ACT_NOTHING;
671                         else {
672                                 mpp->wait_for_udev = 1;
673                                 mpp->uev_wait_tick = conf->uev_wait_timeout;
674                         }
675                 }
676                 dm_setgeometry(mpp);
677                 return DOMAP_OK;
678         }
679         return DOMAP_FAIL;
680 }
681
682 static int
683 deadmap (struct multipath * mpp)
684 {
685         int i, j;
686         struct pathgroup * pgp;
687         struct path * pp;
688
689         if (!mpp->pg)
690                 return 1;
691
692         vector_foreach_slot (mpp->pg, pgp, i) {
693                 if (!pgp->paths)
694                         continue;
695
696                 vector_foreach_slot (pgp->paths, pp, j)
697                         if (strlen(pp->dev))
698                                 return 0; /* alive */
699         }
700
701         return 1; /* dead */
702 }
703
704 int check_daemon(void)
705 {
706         int fd;
707         char *reply;
708         int ret = 0;
709
710         fd = mpath_connect();
711         if (fd == -1)
712                 return 0;
713
714         if (send_packet(fd, "show daemon") != 0)
715                 goto out;
716         if (recv_packet(fd, &reply, conf->uxsock_timeout) != 0)
717                 goto out;
718
719         if (strstr(reply, "shutdown"))
720                 goto out_free;
721
722         ret = 1;
723
724 out_free:
725         FREE(reply);
726 out:
727         mpath_disconnect(fd);
728         return ret;
729 }
730
731 extern int
732 coalesce_paths (struct vectors * vecs, vector newmp, char * refwwid, int force_reload)
733 {
734         int r = 1;
735         int k, i;
736         char params[PARAMS_SIZE];
737         struct multipath * mpp;
738         struct path * pp1;
739         struct path * pp2;
740         vector curmp = vecs->mpvec;
741         vector pathvec = vecs->pathvec;
742
743         /* ignore refwwid if it's empty */
744         if (refwwid && !strlen(refwwid))
745                 refwwid = NULL;
746
747         if (force_reload) {
748                 vector_foreach_slot (pathvec, pp1, k) {
749                         pp1->mpp = NULL;
750                 }
751         }
752         vector_foreach_slot (pathvec, pp1, k) {
753                 /* skip this path for some reason */
754
755                 /* 1. if path has no unique id or wwid blacklisted */
756                 if (strlen(pp1->wwid) == 0 ||
757                     filter_path(conf, pp1) > 0) {
758                         orphan_path(pp1, "wwid blacklisted");
759                         continue;
760                 }
761
762                 /* 2. if path already coalesced */
763                 if (pp1->mpp)
764                         continue;
765
766                 /* 3. if path has disappeared */
767                 if (pp1->state == PATH_REMOVED) {
768                         orphan_path(pp1, "path removed");
769                         continue;
770                 }
771
772                 /* 4. path is out of scope */
773                 if (refwwid && strncmp(pp1->wwid, refwwid, WWID_SIZE))
774                         continue;
775
776                 /* If find_multipaths was selected check if the path is valid */
777                 if (!refwwid && !should_multipath(pp1, pathvec)) {
778                         orphan_path(pp1, "only one path");
779                         continue;
780                 }
781
782                 /*
783                  * at this point, we know we really got a new mp
784                  */
785                 mpp = add_map_with_path(vecs, pp1, 0);
786                 if (!mpp)
787                         return 1;
788
789                 if (pp1->priority == PRIO_UNDEF)
790                         mpp->action = ACT_REJECT;
791
792                 if (!mpp->paths) {
793                         condlog(0, "%s: skip coalesce (no paths)", mpp->alias);
794                         remove_map(mpp, vecs, 0);
795                         continue;
796                 }
797
798                 for (i = k + 1; i < VECTOR_SIZE(pathvec); i++) {
799                         pp2 = VECTOR_SLOT(pathvec, i);
800
801                         if (strcmp(pp1->wwid, pp2->wwid))
802                                 continue;
803
804                         if (!mpp->size && pp2->size)
805                                 mpp->size = pp2->size;
806
807                         if (mpp->size && pp2->size &&
808                             pp2->size != mpp->size) {
809                                 /*
810                                  * ouch, avoid feeding that to the DM
811                                  */
812                                 condlog(0, "%s: size %llu, expected %llu. "
813                                         "Discard", pp2->dev_t, pp2->size,
814                                         mpp->size);
815                                 mpp->action = ACT_REJECT;
816                         }
817                         if (pp2->priority == PRIO_UNDEF)
818                                 mpp->action = ACT_REJECT;
819                 }
820                 verify_paths(mpp, vecs);
821
822                 params[0] = '\0';
823                 if (setup_map(mpp, params, PARAMS_SIZE)) {
824                         remove_map(mpp, vecs, 0);
825                         continue;
826                 }
827
828                 if (mpp->action == ACT_UNDEF)
829                         select_action(mpp, curmp, force_reload);
830
831                 r = domap(mpp, params);
832
833                 if (r == DOMAP_FAIL || r == DOMAP_RETRY) {
834                         condlog(3, "%s: domap (%u) failure "
835                                    "for create/reload map",
836                                 mpp->alias, r);
837                         if (r == DOMAP_FAIL) {
838                                 condlog(2, "%s: %s map",
839                                         mpp->alias, (mpp->action == ACT_CREATE)?
840                                         "ignoring" : "removing");
841                                 remove_map(mpp, vecs, 0);
842                                 continue;
843                         } else /* if (r == DOMAP_RETRY) */
844                                 return r;
845                 }
846                 if (r == DOMAP_DRY)
847                         continue;
848
849                 if (!conf->daemon && !conf->allow_queueing && !check_daemon()) {
850                         if (mpp->no_path_retry != NO_PATH_RETRY_UNDEF &&
851                             mpp->no_path_retry != NO_PATH_RETRY_FAIL)
852                                 condlog(3, "%s: multipathd not running, unset "
853                                         "queue_if_no_path feature", mpp->alias);
854                         if (!dm_queue_if_no_path(mpp->alias, 0))
855                                 remove_feature(&mpp->features,
856                                                "queue_if_no_path");
857                 }
858                 else if (mpp->no_path_retry != NO_PATH_RETRY_UNDEF) {
859                         if (mpp->no_path_retry == NO_PATH_RETRY_FAIL) {
860                                 condlog(3, "%s: unset queue_if_no_path feature",
861                                         mpp->alias);
862                                 if (!dm_queue_if_no_path(mpp->alias, 0))
863                                         remove_feature(&mpp->features,
864                                                        "queue_if_no_path");
865                         } else {
866                                 condlog(3, "%s: set queue_if_no_path feature",
867                                         mpp->alias);
868                                 if (!dm_queue_if_no_path(mpp->alias, 1))
869                                         add_feature(&mpp->features,
870                                                     "queue_if_no_path");
871                         }
872                 }
873
874                 if (!conf->daemon && mpp->action != ACT_NOTHING)
875                         print_multipath_topology(mpp, conf->verbosity);
876
877                 if (newmp) {
878                         if (mpp->action != ACT_REJECT) {
879                                 if (!vector_alloc_slot(newmp))
880                                         return 1;
881                                 vector_set_slot(newmp, mpp);
882                         }
883                         else
884                                 remove_map(mpp, vecs, 0);
885                 }
886         }
887         /*
888          * Flush maps with only dead paths (ie not in sysfs)
889          * Keep maps with only failed paths
890          */
891         if (newmp) {
892                 vector_foreach_slot (newmp, mpp, i) {
893                         char alias[WWID_SIZE];
894                         int j;
895
896                         if (!deadmap(mpp))
897                                 continue;
898
899                         strncpy(alias, mpp->alias, WWID_SIZE);
900
901                         if ((j = find_slot(newmp, (void *)mpp)) != -1)
902                                 vector_del_slot(newmp, j);
903
904                         remove_map(mpp, vecs, 0);
905
906                         if (dm_flush_map(alias))
907                                 condlog(2, "%s: remove failed (dead)",
908                                         alias);
909                         else
910                                 condlog(2, "%s: remove (dead)", alias);
911                 }
912         }
913         return 0;
914 }
915
916 /*
917  * returns:
918  * 0 - success
919  * 1 - failure
920  * 2 - blacklist
921  */
922 extern int
923 get_refwwid (char * dev, enum devtypes dev_type, vector pathvec, char **wwid)
924 {
925         int ret = 1;
926         struct path * pp;
927         char buff[FILE_NAME_SIZE];
928         char * refwwid = NULL, tmpwwid[WWID_SIZE];
929
930         if (!wwid)
931                 return 1;
932         *wwid = NULL;
933
934         if (dev_type == DEV_NONE)
935                 return 1;
936
937         if (dev_type == DEV_DEVNODE) {
938                 if (basenamecpy(dev, buff, FILE_NAME_SIZE) == 0) {
939                         condlog(1, "basename failed for '%s' (%s)",
940                                 dev, buff);
941                         return 1;
942                 }
943
944                 pp = find_path_by_dev(pathvec, buff);
945                 if (!pp) {
946                         struct udev_device *udevice = udev_device_new_from_subsystem_sysname(conf->udev, "block", buff);
947
948                         if (!udevice) {
949                                 condlog(2, "%s: can't get udev device", buff);
950                                 return 1;
951                         }
952                         ret = store_pathinfo(pathvec, conf->hwtable, udevice,
953                                              DI_SYSFS | DI_WWID, &pp);
954                         udev_device_unref(udevice);
955                         if (!pp) {
956                                 if (ret == 1)
957                                         condlog(0, "%s: can't store path info",
958                                                 dev);
959                                 return ret;
960                         }
961                 }
962                 if (pp->udev && pp->uid_attribute &&
963                     filter_property(conf, pp->udev) > 0)
964                         return 2;
965
966                 refwwid = pp->wwid;
967                 goto out;
968         }
969
970         if (dev_type == DEV_DEVT) {
971                 strchop(dev);
972                 if (devt2devname(buff, FILE_NAME_SIZE, dev)) {
973                         condlog(0, "%s: cannot find block device\n", dev);
974                         return 1;
975                 }
976                 pp = find_path_by_dev(pathvec, buff);
977                 if (!pp) {
978                         struct udev_device *udevice = udev_device_new_from_devnum(conf->udev, 'b', parse_devt(dev));
979
980                         if (!udevice) {
981                                 condlog(2, "%s: can't get udev device", dev);
982                                 return 1;
983                         }
984                         ret = store_pathinfo(pathvec, conf->hwtable, udevice,
985                                              DI_SYSFS | DI_WWID, &pp);
986                         udev_device_unref(udevice);
987                         if (!pp) {
988                                 if (ret == 1)
989                                         condlog(0, "%s can't store path info",
990                                                 buff);
991                                 return ret;
992                         }
993                 }
994                 if (pp->udev && pp->uid_attribute &&
995                     filter_property(conf, pp->udev) > 0)
996                         return 2;
997
998                 refwwid = pp->wwid;
999                 goto out;
1000         }
1001
1002         if (dev_type == DEV_UEVENT) {
1003                 struct udev_device *udevice = udev_device_new_from_environment(conf->udev);
1004
1005                 if (!udevice) {
1006                         condlog(2, "%s: can't get udev device", dev);
1007                         return 1;
1008                 }
1009                 ret = store_pathinfo(pathvec, conf->hwtable, udevice,
1010                                      DI_SYSFS | DI_WWID, &pp);
1011                 udev_device_unref(udevice);
1012                 if (!pp) {
1013                         if (ret == 1)
1014                                 condlog(0, "%s: can't store path info",
1015                                         dev);
1016                         return ret;
1017                 }
1018                 if (pp->udev && pp->uid_attribute &&
1019                     filter_property(conf, pp->udev) > 0)
1020                         return 2;
1021
1022                 refwwid = pp->wwid;
1023                 goto out;
1024         }
1025
1026         if (dev_type == DEV_DEVMAP) {
1027
1028                 if (((dm_get_uuid(dev, tmpwwid)) == 0) && (strlen(tmpwwid))) {
1029                         refwwid = tmpwwid;
1030                         goto check;
1031                 }
1032
1033                 /*
1034                  * may be a binding
1035                  */
1036                 if (get_user_friendly_wwid(dev, tmpwwid,
1037                                            conf->bindings_file) == 0) {
1038                         refwwid = tmpwwid;
1039                         goto check;
1040                 }
1041
1042                 /*
1043                  * or may be an alias
1044                  */
1045                 refwwid = get_mpe_wwid(dev);
1046
1047                 /*
1048                  * or directly a wwid
1049                  */
1050                 if (!refwwid)
1051                         refwwid = dev;
1052
1053 check:
1054                 if (refwwid && strlen(refwwid)) {
1055                         if (filter_wwid(conf->blist_wwid, conf->elist_wwid,
1056                                         refwwid, NULL) > 0)
1057                         return 2;
1058                 }
1059         }
1060 out:
1061         if (refwwid && strlen(refwwid)) {
1062                 *wwid = STRDUP(refwwid);
1063                 return 0;
1064         }
1065
1066         return 1;
1067 }
1068
1069 extern int reload_map(struct vectors *vecs, struct multipath *mpp, int refresh)
1070 {
1071         char params[PARAMS_SIZE] = {0};
1072         struct path *pp;
1073         int i, r;
1074
1075         update_mpp_paths(mpp, vecs->pathvec);
1076         if (refresh) {
1077                 vector_foreach_slot (mpp->paths, pp, i) {
1078                         r = pathinfo(pp, conf->hwtable, DI_PRIO);
1079                         if (r) {
1080                                 condlog(2, "%s: failed to refresh pathinfo",
1081                                         mpp->alias);
1082                                 return 1;
1083                         }
1084                 }
1085         }
1086         if (setup_map(mpp, params, PARAMS_SIZE)) {
1087                 condlog(0, "%s: failed to setup map", mpp->alias);
1088                 return 1;
1089         }
1090         select_action(mpp, vecs->mpvec, 1);
1091
1092         r = domap(mpp, params);
1093         if (r == DOMAP_FAIL || r == DOMAP_RETRY) {
1094                 condlog(3, "%s: domap (%u) failure "
1095                         "for reload map", mpp->alias, r);
1096                 return 1;
1097         }
1098         if (mpp->no_path_retry != NO_PATH_RETRY_UNDEF) {
1099                 if (mpp->no_path_retry == NO_PATH_RETRY_FAIL)
1100                         dm_queue_if_no_path(mpp->alias, 0);
1101                 else
1102                         dm_queue_if_no_path(mpp->alias, 1);
1103         }
1104
1105         return 0;
1106 }