e1fb4b1c4c8ad18fd71e178f241b97c3a0429161
[multipath-tools/.git] / libmultipath / structs_vec.c
1 #include <stdio.h>
2 #include <string.h>
3 #include <unistd.h>
4
5 #include "checkers.h"
6 #include "vector.h"
7 #include "defaults.h"
8 #include "debug.h"
9 #include "structs.h"
10 #include "structs_vec.h"
11 #include "waiter.h"
12 #include "devmapper.h"
13 #include "dmparser.h"
14 #include "config.h"
15 #include "propsel.h"
16 #include "sysfs.h"
17 #include "discovery.h"
18 #include "prio.h"
19
20 /*
21  * creates or updates mpp->paths reading mpp->pg
22  */
23 extern int
24 update_mpp_paths(struct multipath * mpp, vector pathvec)
25 {
26         struct pathgroup * pgp;
27         struct path * pp;
28         int i,j;
29
30         if (!mpp || !mpp->pg)
31                 return 0;
32
33         if (!mpp->paths &&
34             !(mpp->paths = vector_alloc()))
35                 return 1;
36
37         vector_foreach_slot (mpp->pg, pgp, i) {
38                 vector_foreach_slot (pgp->paths, pp, j) {
39                         if (!find_path_by_devt(mpp->paths, pp->dev_t) &&
40                             (find_path_by_devt(pathvec, pp->dev_t)) &&
41                             store_path(mpp->paths, pp))
42                                 return 1;
43                 }
44         }
45         return 0;
46 }
47
48 extern int
49 adopt_paths (vector pathvec, struct multipath * mpp, int get_info)
50 {
51         int i;
52         struct path * pp;
53
54         if (!mpp)
55                 return 0;
56
57         if (update_mpp_paths(mpp, pathvec))
58                 return 1;
59
60         vector_foreach_slot (pathvec, pp, i) {
61                 if (!strncmp(mpp->wwid, pp->wwid, WWID_SIZE)) {
62                         condlog(3, "%s: ownership set to %s",
63                                 pp->dev, mpp->alias);
64                         pp->mpp = mpp;
65
66                         if (!mpp->paths && !(mpp->paths = vector_alloc()))
67                                 return 1;
68
69                         if (!find_path_by_dev(mpp->paths, pp->dev) &&
70                             store_path(mpp->paths, pp))
71                                         return 1;
72                         if (get_info)
73                                 pathinfo(pp, conf->hwtable,
74                                          DI_PRIO | DI_CHECKER);
75                 }
76         }
77         return 0;
78 }
79
80 extern void
81 orphan_path (struct path * pp)
82 {
83         pp->mpp = NULL;
84         pp->dmstate = PSTATE_UNDEF;
85         pp->uid_attribute = NULL;
86         pp->prio = NULL;
87         checker_put(&pp->checker);
88         if (pp->fd >= 0)
89                 close(pp->fd);
90         pp->fd = -1;
91 }
92
93 extern void
94 orphan_paths (vector pathvec, struct multipath * mpp)
95 {
96         int i;
97         struct path * pp;
98
99         vector_foreach_slot (pathvec, pp, i) {
100                 if (pp->mpp == mpp) {
101                         condlog(4, "%s: orphaned", pp->dev);
102                         orphan_path(pp);
103                 }
104         }
105 }
106
107 static void
108 set_multipath_wwid (struct multipath * mpp)
109 {
110         if (mpp->wwid)
111                 return;
112
113         dm_get_uuid(mpp->alias, mpp->wwid);
114 }
115
116 #define KEEP_WAITER 0
117 #define STOP_WAITER 1
118 #define PURGE_VEC 1
119
120 static void
121 _remove_map (struct multipath * mpp, struct vectors * vecs,
122             int stop_waiter, int purge_vec)
123 {
124         int i;
125
126         condlog(4, "%s: remove multipath map", mpp->alias);
127
128         /*
129          * stop the DM event waiter thread
130          */
131         if (stop_waiter)
132                 stop_waiter_thread(mpp, vecs);
133
134         /*
135          * clear references to this map
136          */
137         orphan_paths(vecs->pathvec, mpp);
138
139         if (purge_vec &&
140             (i = find_slot(vecs->mpvec, (void *)mpp)) != -1)
141                 vector_del_slot(vecs->mpvec, i);
142
143         /*
144          * final free
145          */
146         free_multipath(mpp, KEEP_PATHS);
147 }
148
149 extern void
150 remove_map (struct multipath * mpp, struct vectors * vecs, int purge_vec)
151 {
152         _remove_map(mpp, vecs, KEEP_WAITER, purge_vec);
153 }
154
155 extern void
156 remove_map_and_stop_waiter (struct multipath * mpp, struct vectors * vecs,
157                             int purge_vec)
158 {
159         _remove_map(mpp, vecs, STOP_WAITER, purge_vec);
160 }
161
162 static void
163 _remove_maps (struct vectors * vecs, int stop_waiter)
164 {
165         int i;
166         struct multipath * mpp;
167
168         if (!vecs)
169                 return;
170
171         vector_foreach_slot (vecs->mpvec, mpp, i) {
172                 _remove_map(mpp, vecs, stop_waiter, 1);
173                 i--;
174         }
175
176         vector_free(vecs->mpvec);
177         vecs->mpvec = NULL;
178 }
179
180 extern void
181 remove_maps (struct vectors * vecs)
182 {
183         _remove_maps(vecs, KEEP_WAITER);
184 }
185
186 extern void
187 remove_maps_and_stop_waiters (struct vectors * vecs)
188 {
189         _remove_maps(vecs, STOP_WAITER);
190 }
191
192 static struct hwentry *
193 extract_hwe_from_path(struct multipath * mpp)
194 {
195         struct path * pp = NULL;
196         int pg_num = -1, p_num = -1, i;
197         struct pathgroup * pgp = NULL;
198
199         condlog(3, "%s: searching paths for valid hwe", mpp->alias);
200
201         if (mpp && mpp->pg) {
202                 vector_foreach_slot(mpp->pg, pgp, i) {
203                         if (pgp->status == PGSTATE_ACTIVE ||
204                             pgp->status == PGSTATE_ENABLED) {
205                                 pg_num = i;
206                                 break;
207                         }
208                 }
209                 if (pg_num >= 0)
210                         pgp = VECTOR_SLOT(mpp->pg, pg_num);
211         }
212
213         if (pgp && pgp->paths) {
214                 vector_foreach_slot(pgp->paths, pp, i) {
215                         if (pp->dmstate == PSTATE_FAILED)
216                                 continue;
217                         if (strlen(pp->vendor_id) > 0 &&
218                             strlen(pp->product_id) > 0 &&
219                             strlen(pp->rev) > 0) {
220                                 p_num = i;
221                                 break;
222                         }
223                 }
224                 if (p_num >= 0)
225                         pp = VECTOR_SLOT(pgp->paths, i);
226         }
227
228         if (pp) {
229                 condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
230                 condlog(3, "%s: product = %s", pp->dev, pp->product_id);
231                 condlog(3, "%s: rev = %s", pp->dev, pp->rev);
232                 if (!pp->hwe) {
233                         condlog(3, "searching hwtable");
234                         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id,
235                                            pp->product_id, pp->rev);
236                 }
237         }
238
239         return pp?pp->hwe:NULL;
240 }
241
242 static int
243 update_multipath_table (struct multipath *mpp, vector pathvec)
244 {
245         char params[PARAMS_SIZE] = {0};
246
247         if (!mpp)
248                 return 1;
249
250         if (dm_get_map(mpp->alias, &mpp->size, params))
251                 return 1;
252
253         if (disassemble_map(pathvec, params, mpp))
254                 return 1;
255
256         return 0;
257 }
258
259 static int
260 update_multipath_status (struct multipath *mpp)
261 {
262         char status[PARAMS_SIZE] = {0};
263
264         if (!mpp)
265                 return 1;
266
267         if(dm_get_status(mpp->alias, status))
268                 return 1;
269
270         if (disassemble_status(status, mpp))
271                 return 1;
272
273         return 0;
274 }
275
276 extern int
277 update_multipath_strings (struct multipath *mpp, vector pathvec)
278 {
279         if (!mpp)
280                 return 1;
281
282         condlog(4, "%s: %s", mpp->alias, __FUNCTION__);
283
284         free_multipath_attributes(mpp);
285         free_pgvec(mpp->pg, KEEP_PATHS);
286         mpp->pg = NULL;
287
288         if (update_multipath_table(mpp, pathvec))
289                 return 1;
290
291         if (update_multipath_status(mpp))
292                 return 1;
293
294         return 0;
295 }
296
297 extern void
298 set_no_path_retry(struct multipath *mpp)
299 {
300         mpp->retry_tick = 0;
301         mpp->nr_active = pathcount(mpp, PATH_UP) + pathcount(mpp, PATH_GHOST);
302         if (mpp->nr_active > 0)
303                 select_no_path_retry(mpp);
304
305         switch (mpp->no_path_retry) {
306         case NO_PATH_RETRY_UNDEF:
307                 break;
308         case NO_PATH_RETRY_FAIL:
309                 dm_queue_if_no_path(mpp->alias, 0);
310                 break;
311         case NO_PATH_RETRY_QUEUE:
312                 dm_queue_if_no_path(mpp->alias, 1);
313                 break;
314         default:
315                 dm_queue_if_no_path(mpp->alias, 1);
316                 if (mpp->nr_active == 0) {
317                         /* Enter retry mode */
318                         mpp->retry_tick = mpp->no_path_retry * conf->checkint;
319                         condlog(1, "%s: Entering recovery mode: max_retries=%d",
320                                 mpp->alias, mpp->no_path_retry);
321                 }
322                 break;
323         }
324 }
325
326 extern int
327 __setup_multipath (struct vectors * vecs, struct multipath * mpp, int reset)
328 {
329         if (dm_get_info(mpp->alias, &mpp->dmi)) {
330                 /* Error accessing table */
331                 condlog(3, "%s: cannot access table", mpp->alias);
332                 goto out;
333         }
334
335         if (!dm_map_present(mpp->alias)) {
336                 /* Table has been removed */
337                 condlog(3, "%s: table does not exist", mpp->alias);
338                 goto out;
339         }
340
341         set_multipath_wwid(mpp);
342         mpp->mpe = find_mpe(mpp->wwid);
343         condlog(3, "%s: discover", mpp->alias);
344
345         if (update_multipath_strings(mpp, vecs->pathvec)) {
346                 condlog(0, "%s: failed to setup multipath", mpp->alias);
347                 goto out;
348         }
349
350         if (!mpp->hwe)
351                 mpp->hwe = extract_hwe_from_path(mpp);
352         if (!mpp->hwe) {
353                 condlog(3, "%s: no hardware entry found, using defaults",
354                         mpp->alias);
355         }
356         if (reset) {
357                 select_rr_weight(mpp);
358                 select_pgfailback(mpp);
359                 set_no_path_retry(mpp);
360                 select_pg_timeout(mpp);
361                 select_flush_on_last_del(mpp);
362         }
363
364         return 0;
365 out:
366         remove_map(mpp, vecs, PURGE_VEC);
367         return 1;
368 }
369
370 extern struct multipath *
371 add_map_without_path (struct vectors * vecs, char * alias)
372 {
373         struct multipath * mpp = alloc_multipath();
374
375         if (!mpp || !alias)
376                 return NULL;
377
378         mpp->alias = STRDUP(alias);
379
380         if (setup_multipath(vecs, mpp))
381                 return NULL; /* mpp freed in setup_multipath */
382
383         if (adopt_paths(vecs->pathvec, mpp, 1))
384                 goto out;
385
386         if (!vector_alloc_slot(vecs->mpvec))
387                 goto out;
388
389         vector_set_slot(vecs->mpvec, mpp);
390
391         if (start_waiter_thread(mpp, vecs))
392                 goto out;
393
394         return mpp;
395 out:
396         remove_map(mpp, vecs, PURGE_VEC);
397         return NULL;
398 }
399
400 extern struct multipath *
401 add_map_with_path (struct vectors * vecs,
402                    struct path * pp, int add_vec)
403 {
404         struct multipath * mpp;
405
406         if (!(mpp = alloc_multipath()))
407                 return NULL;
408
409         mpp->mpe = find_mpe(pp->wwid);
410         mpp->hwe = pp->hwe;
411
412         strcpy(mpp->wwid, pp->wwid);
413         if (select_alias(mpp))
414                 goto out;
415         mpp->size = pp->size;
416
417         if (adopt_paths(vecs->pathvec, mpp, 1))
418                 goto out;
419
420         if (add_vec) {
421                 if (!vector_alloc_slot(vecs->mpvec))
422                         goto out;
423
424                 vector_set_slot(vecs->mpvec, mpp);
425         }
426
427         return mpp;
428
429 out:
430         remove_map(mpp, vecs, PURGE_VEC);
431         return NULL;
432 }
433
434 extern int
435 verify_paths(struct multipath * mpp, struct vectors * vecs, vector rpvec)
436 {
437         struct path * pp;
438         int count = 0;
439         int i, j;
440
441         if (!mpp)
442                 return 0;
443
444         vector_foreach_slot (mpp->paths, pp, i) {
445                 /*
446                  * see if path is in sysfs
447                  */
448                 if (!pp->udev || sysfs_get_dev(pp->udev, pp->dev_t,
449                                                BLK_DEV_SIZE)) {
450                         if (pp->state != PATH_DOWN) {
451                                 condlog(1, "%s: removing valid path %s in state %d",
452                                         mpp->alias, pp->dev, pp->state);
453                         } else {
454                                 condlog(3, "%s: failed to access path %s",
455                                         mpp->alias, pp->dev);
456                         }
457                         count++;
458                         vector_del_slot(mpp->paths, i);
459                         i--;
460
461                         if (rpvec)
462                                 store_path(rpvec, pp);
463                         else {
464                                 if ((j = find_slot(vecs->pathvec,
465                                                    (void *)pp)) != -1)
466                                         vector_del_slot(vecs->pathvec, j);
467                                 free_path(pp);
468                         }
469                 } else {
470                         condlog(4, "%s: verified path %s dev_t %s",
471                                 mpp->alias, pp->dev, pp->dev_t);
472                 }
473         }
474         return count;
475 }
476
477 int update_multipath (struct vectors *vecs, char *mapname, int reset)
478 {
479         struct multipath *mpp;
480         struct pathgroup  *pgp;
481         struct path *pp;
482         int i, j;
483
484         mpp = find_mp_by_alias(vecs->mpvec, mapname);
485
486         if (!mpp) {
487                 condlog(3, "%s: multipath map not found\n", mapname);
488                 return 2;
489         }
490
491         free_pgvec(mpp->pg, KEEP_PATHS);
492         mpp->pg = NULL;
493
494         if (__setup_multipath(vecs, mpp, reset))
495                 return 1; /* mpp freed in setup_multipath */
496
497         adopt_paths(vecs->pathvec, mpp, 0);
498         /*
499          * compare checkers states with DM states
500          */
501         vector_foreach_slot (mpp->pg, pgp, i) {
502                 vector_foreach_slot (pgp->paths, pp, j) {
503                         if (pp->dmstate != PSTATE_FAILED)
504                                 continue;
505
506                         if (pp->state != PATH_DOWN) {
507                                 int oldstate = pp->state;
508                                 condlog(2, "%s: mark as failed", pp->dev_t);
509                                 mpp->stat_path_failures++;
510                                 pp->state = PATH_DOWN;
511                                 if (oldstate == PATH_UP ||
512                                     oldstate == PATH_GHOST)
513                                         update_queue_mode_del_path(mpp);
514
515                                 /*
516                                  * if opportune,
517                                  * schedule the next check earlier
518                                  */
519                                 if (pp->tick > conf->checkint)
520                                         pp->tick = conf->checkint;
521                         }
522                 }
523         }
524
525         return 0;
526 }
527
528 /*
529  * mpp->no_path_retry:
530  *   -2 (QUEUE) : queue_if_no_path enabled, never turned off
531  *   -1 (FAIL)  : fail_if_no_path
532  *    0 (UNDEF) : nothing
533  *   >0         : queue_if_no_path enabled, turned off after polling n times
534  */
535 void update_queue_mode_del_path(struct multipath *mpp)
536 {
537         if (--mpp->nr_active == 0 && mpp->no_path_retry > 0) {
538                 /*
539                  * Enter retry mode.
540                  * meaning of +1: retry_tick may be decremented in
541                  *                checkerloop before starting retry.
542                  */
543                 mpp->stat_queueing_timeouts++;
544                 mpp->retry_tick = mpp->no_path_retry * conf->checkint + 1;
545                 condlog(1, "%s: Entering recovery mode: max_retries=%d",
546                         mpp->alias, mpp->no_path_retry);
547         }
548         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
549 }
550
551 void update_queue_mode_add_path(struct multipath *mpp)
552 {
553         if (mpp->nr_active++ == 0 && mpp->no_path_retry > 0) {
554                 /* come back to normal mode from retry mode */
555                 mpp->retry_tick = 0;
556                 dm_queue_if_no_path(mpp->alias, 1);
557                 condlog(2, "%s: queue_if_no_path enabled", mpp->alias);
558                 condlog(1, "%s: Recovered to normal mode", mpp->alias);
559         }
560         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
561 }
562