384afb744ad55ceb2cd956c5bdf03e20a2ca3d92
[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 "discovery.h"
17 #include "prio.h"
18
19 /*
20  * creates or updates mpp->paths reading mpp->pg
21  */
22 extern int
23 update_mpp_paths(struct multipath * mpp, vector pathvec)
24 {
25         struct pathgroup * pgp;
26         struct path * pp;
27         int i,j;
28
29         if (!mpp || !mpp->pg)
30                 return 0;
31
32         if (!mpp->paths &&
33             !(mpp->paths = vector_alloc()))
34                 return 1;
35
36         vector_foreach_slot (mpp->pg, pgp, i) {
37                 vector_foreach_slot (pgp->paths, pp, j) {
38                         if (!find_path_by_devt(mpp->paths, pp->dev_t) &&
39                             (find_path_by_devt(pathvec, pp->dev_t)) &&
40                             store_path(mpp->paths, pp))
41                                 return 1;
42                 }
43         }
44         return 0;
45 }
46
47 extern int
48 adopt_paths (vector pathvec, struct multipath * mpp, int get_info)
49 {
50         int i;
51         struct path * pp;
52
53         if (!mpp)
54                 return 0;
55
56         if (update_mpp_paths(mpp, pathvec))
57                 return 1;
58
59         vector_foreach_slot (pathvec, pp, i) {
60                 if (!strncmp(mpp->wwid, pp->wwid, WWID_SIZE)) {
61                         condlog(3, "%s: ownership set to %s",
62                                 pp->dev, mpp->alias);
63                         pp->mpp = mpp;
64
65                         if (!mpp->paths && !(mpp->paths = vector_alloc()))
66                                 return 1;
67
68                         if (!find_path_by_dev(mpp->paths, pp->dev) &&
69                             store_path(mpp->paths, pp))
70                                         return 1;
71                         if (get_info && pathinfo(pp, conf->hwtable,
72                                                  DI_PRIO | DI_CHECKER))
73                                 return 1;
74                 }
75         }
76         return 0;
77 }
78
79 extern void
80 orphan_path (struct path * pp)
81 {
82         pp->mpp = NULL;
83         pp->dmstate = PSTATE_UNDEF;
84         pp->uid_attribute = NULL;
85         prio_put(&pp->prio);
86         checker_put(&pp->checker);
87         if (pp->fd >= 0)
88                 close(pp->fd);
89         pp->fd = -1;
90 }
91
92 extern void
93 orphan_paths (vector pathvec, struct multipath * mpp)
94 {
95         int i;
96         struct path * pp;
97
98         vector_foreach_slot (pathvec, pp, i) {
99                 if (pp->mpp == mpp) {
100                         condlog(4, "%s: orphaned", pp->dev);
101                         orphan_path(pp);
102                 }
103         }
104 }
105
106 static void
107 set_multipath_wwid (struct multipath * mpp)
108 {
109         if (mpp->wwid)
110                 return;
111
112         dm_get_uuid(mpp->alias, mpp->wwid);
113 }
114
115 #define KEEP_WAITER 0
116 #define STOP_WAITER 1
117 #define PURGE_VEC 1
118
119 static void
120 _remove_map (struct multipath * mpp, struct vectors * vecs,
121             int stop_waiter, int purge_vec)
122 {
123         int i;
124
125         condlog(4, "%s: remove multipath map", mpp->alias);
126
127         /*
128          * stop the DM event waiter thread
129          */
130         if (stop_waiter)
131                 stop_waiter_thread(mpp, vecs);
132
133         /*
134          * clear references to this map
135          */
136         orphan_paths(vecs->pathvec, mpp);
137
138         if (purge_vec &&
139             (i = find_slot(vecs->mpvec, (void *)mpp)) != -1)
140                 vector_del_slot(vecs->mpvec, i);
141
142         /*
143          * final free
144          */
145         free_multipath(mpp, KEEP_PATHS);
146 }
147
148 extern void
149 remove_map (struct multipath * mpp, struct vectors * vecs, int purge_vec)
150 {
151         _remove_map(mpp, vecs, KEEP_WAITER, purge_vec);
152 }
153
154 extern void
155 remove_map_and_stop_waiter (struct multipath * mpp, struct vectors * vecs,
156                             int purge_vec)
157 {
158         _remove_map(mpp, vecs, STOP_WAITER, purge_vec);
159 }
160
161 static void
162 _remove_maps (struct vectors * vecs, int stop_waiter)
163 {
164         int i;
165         struct multipath * mpp;
166
167         if (!vecs)
168                 return;
169
170         vector_foreach_slot (vecs->mpvec, mpp, i) {
171                 _remove_map(mpp, vecs, stop_waiter, 1);
172                 i--;
173         }
174
175         vector_free(vecs->mpvec);
176         vecs->mpvec = NULL;
177 }
178
179 extern void
180 remove_maps (struct vectors * vecs)
181 {
182         _remove_maps(vecs, KEEP_WAITER);
183 }
184
185 extern void
186 remove_maps_and_stop_waiters (struct vectors * vecs)
187 {
188         _remove_maps(vecs, STOP_WAITER);
189 }
190
191 static struct hwentry *
192 extract_hwe_from_path(struct multipath * mpp)
193 {
194         struct path * pp = NULL;
195         int pg_num = -1, p_num = -1, i;
196         struct pathgroup * pgp = NULL;
197
198         condlog(3, "%s: searching paths for valid hwe", mpp->alias);
199
200         if (mpp && mpp->pg) {
201                 vector_foreach_slot(mpp->pg, pgp, i) {
202                         if (pgp->status == PGSTATE_ACTIVE ||
203                             pgp->status == PGSTATE_ENABLED) {
204                                 pg_num = i;
205                                 break;
206                         }
207                 }
208                 if (pg_num >= 0)
209                         pgp = VECTOR_SLOT(mpp->pg, pg_num);
210         }
211
212         if (pgp && pgp->paths) {
213                 vector_foreach_slot(pgp->paths, pp, i) {
214                         if (pp->dmstate == PSTATE_FAILED)
215                                 continue;
216                         if (strlen(pp->vendor_id) > 0 &&
217                             strlen(pp->product_id) > 0 &&
218                             strlen(pp->rev) > 0) {
219                                 p_num = i;
220                                 break;
221                         }
222                 }
223                 if (p_num >= 0)
224                         pp = VECTOR_SLOT(pgp->paths, i);
225         }
226
227         if (pp) {
228                 condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
229                 condlog(3, "%s: product = %s", pp->dev, pp->product_id);
230                 condlog(3, "%s: rev = %s", pp->dev, pp->rev);
231                 if (!pp->hwe) {
232                         condlog(3, "searching hwtable");
233                         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id,
234                                            pp->product_id, pp->rev);
235                 }
236         }
237
238         return pp?pp->hwe:NULL;
239 }
240
241 static int
242 update_multipath_table (struct multipath *mpp, vector pathvec)
243 {
244         char params[PARAMS_SIZE] = {0};
245
246         if (!mpp)
247                 return 1;
248
249         if (dm_get_map(mpp->alias, &mpp->size, params)) {
250                 condlog(3, "%s: cannot get map", mpp->alias);
251                 return 1;
252         }
253
254         if (disassemble_map(pathvec, params, mpp)) {
255                 condlog(3, "%s: cannot disassemble map", mpp->alias);
256                 return 1;
257         }
258
259         return 0;
260 }
261
262 static int
263 update_multipath_status (struct multipath *mpp)
264 {
265         char status[PARAMS_SIZE] = {0};
266
267         if (!mpp)
268                 return 1;
269
270         if (dm_get_status(mpp->alias, status)) {
271                 condlog(3, "%s: cannot get status", mpp->alias);
272                 return 1;
273         }
274
275         if (disassemble_status(status, mpp)) {
276                 condlog(3, "%s: cannot disassemble status", mpp->alias);
277                 return 1;
278         }
279
280         return 0;
281 }
282
283 extern int
284 update_multipath_strings (struct multipath *mpp, vector pathvec)
285 {
286         if (!mpp)
287                 return 1;
288
289         condlog(4, "%s: %s", mpp->alias, __FUNCTION__);
290
291         free_multipath_attributes(mpp);
292         free_pgvec(mpp->pg, KEEP_PATHS);
293         mpp->pg = NULL;
294
295         if (update_multipath_table(mpp, pathvec))
296                 return 1;
297
298         if (update_multipath_status(mpp))
299                 return 1;
300
301         return 0;
302 }
303
304 extern void
305 set_no_path_retry(struct multipath *mpp)
306 {
307         mpp->retry_tick = 0;
308         mpp->nr_active = pathcount(mpp, PATH_UP) + pathcount(mpp, PATH_GHOST);
309         if (mpp->nr_active > 0)
310                 select_no_path_retry(mpp);
311
312         switch (mpp->no_path_retry) {
313         case NO_PATH_RETRY_UNDEF:
314                 break;
315         case NO_PATH_RETRY_FAIL:
316                 dm_queue_if_no_path(mpp->alias, 0);
317                 break;
318         case NO_PATH_RETRY_QUEUE:
319                 dm_queue_if_no_path(mpp->alias, 1);
320                 break;
321         default:
322                 dm_queue_if_no_path(mpp->alias, 1);
323                 if (mpp->nr_active == 0) {
324                         /* Enter retry mode */
325                         mpp->retry_tick = mpp->no_path_retry * conf->checkint;
326                         condlog(1, "%s: Entering recovery mode: max_retries=%d",
327                                 mpp->alias, mpp->no_path_retry);
328                 }
329                 break;
330         }
331 }
332
333 extern int
334 __setup_multipath (struct vectors * vecs, struct multipath * mpp, int reset)
335 {
336         if (dm_get_info(mpp->alias, &mpp->dmi)) {
337                 /* Error accessing table */
338                 condlog(3, "%s: cannot access table", mpp->alias);
339                 goto out;
340         }
341
342         if (!dm_map_present(mpp->alias)) {
343                 /* Table has been removed */
344                 condlog(3, "%s: table does not exist", mpp->alias);
345                 goto out;
346         }
347
348         set_multipath_wwid(mpp);
349         mpp->mpe = find_mpe(mpp->wwid);
350         condlog(3, "%s: discover", mpp->alias);
351
352         if (update_multipath_strings(mpp, vecs->pathvec)) {
353                 condlog(0, "%s: failed to setup multipath", mpp->alias);
354                 goto out;
355         }
356
357         if (!mpp->hwe)
358                 mpp->hwe = extract_hwe_from_path(mpp);
359         if (!mpp->hwe) {
360                 condlog(3, "%s: no hardware entry found, using defaults",
361                         mpp->alias);
362         }
363         if (reset) {
364                 select_rr_weight(mpp);
365                 select_pgfailback(mpp);
366                 set_no_path_retry(mpp);
367                 select_pg_timeout(mpp);
368                 select_flush_on_last_del(mpp);
369         }
370
371         return 0;
372 out:
373         remove_map(mpp, vecs, PURGE_VEC);
374         return 1;
375 }
376
377 extern struct multipath *
378 add_map_without_path (struct vectors * vecs, char * alias)
379 {
380         struct multipath * mpp = alloc_multipath();
381
382         if (!mpp || !alias)
383                 return NULL;
384
385         mpp->alias = STRDUP(alias);
386
387         if (setup_multipath(vecs, mpp))
388                 return NULL; /* mpp freed in setup_multipath */
389
390         if (adopt_paths(vecs->pathvec, mpp, 1))
391                 goto out;
392
393         if (!vector_alloc_slot(vecs->mpvec))
394                 goto out;
395
396         vector_set_slot(vecs->mpvec, mpp);
397
398         if (start_waiter_thread(mpp, vecs))
399                 goto out;
400
401         return mpp;
402 out:
403         remove_map(mpp, vecs, PURGE_VEC);
404         return NULL;
405 }
406
407 extern struct multipath *
408 add_map_with_path (struct vectors * vecs,
409                    struct path * pp, int add_vec)
410 {
411         struct multipath * mpp;
412
413         if (!(mpp = alloc_multipath()))
414                 return NULL;
415
416         mpp->mpe = find_mpe(pp->wwid);
417         mpp->hwe = pp->hwe;
418
419         strcpy(mpp->wwid, pp->wwid);
420         if (select_alias(mpp))
421                 goto out;
422         mpp->size = pp->size;
423
424         if (adopt_paths(vecs->pathvec, mpp, 1))
425                 goto out;
426
427         if (add_vec) {
428                 if (!vector_alloc_slot(vecs->mpvec))
429                         goto out;
430
431                 vector_set_slot(vecs->mpvec, mpp);
432         }
433
434         return mpp;
435
436 out:
437         remove_map(mpp, vecs, PURGE_VEC);
438         return NULL;
439 }
440
441 extern int
442 verify_paths(struct multipath * mpp, struct vectors * vecs, vector rpvec)
443 {
444         struct path * pp;
445         int count = 0;
446         int i, j;
447
448         if (!mpp)
449                 return 0;
450
451         vector_foreach_slot (mpp->paths, pp, i) {
452                 /*
453                  * see if path is in sysfs
454                  */
455                 if (!pp->udev || sysfs_get_dev(pp->udev, pp->dev_t,
456                                                BLK_DEV_SIZE)) {
457                         if (pp->state != PATH_DOWN) {
458                                 condlog(1, "%s: removing valid path %s in state %d",
459                                         mpp->alias, pp->dev, pp->state);
460                         } else {
461                                 condlog(3, "%s: failed to access path %s",
462                                         mpp->alias, pp->dev);
463                         }
464                         count++;
465                         vector_del_slot(mpp->paths, i);
466                         i--;
467
468                         if (rpvec)
469                                 store_path(rpvec, pp);
470                         else {
471                                 if ((j = find_slot(vecs->pathvec,
472                                                    (void *)pp)) != -1)
473                                         vector_del_slot(vecs->pathvec, j);
474                                 free_path(pp);
475                         }
476                 } else {
477                         condlog(4, "%s: verified path %s dev_t %s",
478                                 mpp->alias, pp->dev, pp->dev_t);
479                 }
480         }
481         return count;
482 }
483
484 int update_multipath (struct vectors *vecs, char *mapname, int reset)
485 {
486         struct multipath *mpp;
487         struct pathgroup  *pgp;
488         struct path *pp;
489         int i, j;
490
491         mpp = find_mp_by_alias(vecs->mpvec, mapname);
492
493         if (!mpp) {
494                 condlog(3, "%s: multipath map not found", mapname);
495                 return 2;
496         }
497
498         free_pgvec(mpp->pg, KEEP_PATHS);
499         mpp->pg = NULL;
500
501         if (__setup_multipath(vecs, mpp, reset))
502                 return 1; /* mpp freed in setup_multipath */
503
504         adopt_paths(vecs->pathvec, mpp, 0);
505         /*
506          * compare checkers states with DM states
507          */
508         vector_foreach_slot (mpp->pg, pgp, i) {
509                 vector_foreach_slot (pgp->paths, pp, j) {
510                         if (pp->dmstate != PSTATE_FAILED)
511                                 continue;
512
513                         if (pp->state != PATH_DOWN) {
514                                 int oldstate = pp->state;
515                                 condlog(2, "%s: mark as failed", pp->dev_t);
516                                 mpp->stat_path_failures++;
517                                 pp->state = PATH_DOWN;
518                                 if (oldstate == PATH_UP ||
519                                     oldstate == PATH_GHOST)
520                                         update_queue_mode_del_path(mpp);
521
522                                 /*
523                                  * if opportune,
524                                  * schedule the next check earlier
525                                  */
526                                 if (pp->tick > conf->checkint)
527                                         pp->tick = conf->checkint;
528                         }
529                 }
530         }
531
532         return 0;
533 }
534
535 /*
536  * mpp->no_path_retry:
537  *   -2 (QUEUE) : queue_if_no_path enabled, never turned off
538  *   -1 (FAIL)  : fail_if_no_path
539  *    0 (UNDEF) : nothing
540  *   >0         : queue_if_no_path enabled, turned off after polling n times
541  */
542 void update_queue_mode_del_path(struct multipath *mpp)
543 {
544         if (--mpp->nr_active == 0 && mpp->no_path_retry > 0) {
545                 /*
546                  * Enter retry mode.
547                  * meaning of +1: retry_tick may be decremented in
548                  *                checkerloop before starting retry.
549                  */
550                 mpp->stat_queueing_timeouts++;
551                 mpp->retry_tick = mpp->no_path_retry * conf->checkint + 1;
552                 condlog(1, "%s: Entering recovery mode: max_retries=%d",
553                         mpp->alias, mpp->no_path_retry);
554         }
555         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
556 }
557
558 void update_queue_mode_add_path(struct multipath *mpp)
559 {
560         if (mpp->nr_active++ == 0 && mpp->no_path_retry > 0) {
561                 /* come back to normal mode from retry mode */
562                 mpp->retry_tick = 0;
563                 dm_queue_if_no_path(mpp->alias, 1);
564                 condlog(2, "%s: queue_if_no_path enabled", mpp->alias);
565                 condlog(1, "%s: Recovered to normal mode", mpp->alias);
566         }
567         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
568 }
569