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8322 nl: misleading-indentation
[unleashed/tickless.git] / usr / src / cmd / rcm_daemon / common / dump_rcm.c
blob2cbe3b99d3ae53eeebc49ecc51712b08c277a7d7
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 /*
29 * RCM module for managing dump device during dynamic
30 * reconfiguration.
31 */
32 #include <stdlib.h>
33 #include <unistd.h>
34 #include <fcntl.h>
35 #include <string.h>
36 #include <thread.h>
37 #include <synch.h>
38 #include <assert.h>
39 #include <errno.h>
40 #include <libintl.h>
41 #include <sys/dumpadm.h>
42 #include <sys/param.h>
43 #include <sys/wait.h>
44 #include <sys/types.h>
45 #include <sys/stat.h>
46 #include "rcm_module.h"
47
48 /* cache flags */
49 #define DUMP_CACHE_NEW 0x01
50 #define DUMP_CACHE_STALE 0x02
51 #define DUMP_CACHE_OFFLINED 0x04
52
53 #define DUMPADM "/usr/sbin/dumpadm -d "
54 #define DUMPADM_SWAP DUMPADM"swap"
55
56 typedef struct dump_conf {
57 char device[MAXPATHLEN];
58 int conf_flags; /* defs in <sys/dumpadm.h> */
59 int cache_flags;
60 struct dump_conf *next;
61 struct dump_conf *prev;
62 } dump_conf_t;
63
64 /*
65 * Registration cache.
66 *
67 * N.B. Although we currently only support a single
68 * dump device, the cache is multi-entry since there
69 * may be multiple outstanding registrations.
70 */
71 static dump_conf_t *cache;
72 static mutex_t cache_lock;
73
74 static int dump_register(rcm_handle_t *);
75 static int dump_unregister(rcm_handle_t *);
76 static int dump_getinfo(rcm_handle_t *, char *, id_t, uint_t,
77 char **, char **, nvlist_t *, rcm_info_t **);
78 static int dump_suspend(rcm_handle_t *, char *, id_t, timespec_t *,
79 uint_t, char **, rcm_info_t **);
80 static int dump_resume(rcm_handle_t *, char *, id_t, uint_t,
81 char **, rcm_info_t **);
82 static int dump_offline(rcm_handle_t *, char *, id_t, uint_t,
83 char **, rcm_info_t **);
84 static int dump_online(rcm_handle_t *, char *, id_t, uint_t,
85 char **, rcm_info_t **);
86 static int dump_remove(rcm_handle_t *, char *, id_t, uint_t,
87 char **, rcm_info_t **);
88
89 static int alloc_usage(char **, int);
90 static void cache_insert(dump_conf_t *);
91 static dump_conf_t *cache_lookup(char *);
92 static void cache_remove(dump_conf_t *);
93 static dump_conf_t *dump_conf_alloc(void);
94 static int dump_configure(dump_conf_t *, char **);
95 static int dump_relocate(dump_conf_t *, char **);
96 static void free_cache(void);
97 static void log_cmd_status(int);
98 static int update_cache(rcm_handle_t *);
99
100 static struct rcm_mod_ops dump_ops =
101 {
102 RCM_MOD_OPS_VERSION,
103 dump_register,
104 dump_unregister,
105 dump_getinfo,
106 dump_suspend,
107 dump_resume,
108 dump_offline,
109 dump_online,
110 dump_remove,
111 NULL,
112 NULL,
113 NULL
114 };
115
116 struct rcm_mod_ops *
117 rcm_mod_init()
118 {
119 return (&dump_ops);
120 }
121
122 const char *
123 rcm_mod_info()
124 {
125 return ("RCM Dump module 1.3");
126 }
127
128 int
129 rcm_mod_fini()
130 {
131 free_cache();
132 (void) mutex_destroy(&cache_lock);
133
134 return (RCM_SUCCESS);
135 }
136
137 static int
138 dump_register(rcm_handle_t *hdl)
139 {
140 return (update_cache(hdl));
141 }
142
143 static int
144 dump_unregister(rcm_handle_t *hdl)
145 {
146 dump_conf_t *dc;
147
148 (void) mutex_lock(&cache_lock);
149 while ((dc = cache) != NULL) {
150 cache = cache->next;
151 (void) rcm_unregister_interest(hdl, dc->device, 0);
152 free(dc);
153 }
154 (void) mutex_unlock(&cache_lock);
155
156 return (RCM_SUCCESS);
157 }
158
159 /*ARGSUSED*/
160 static int
161 dump_getinfo(rcm_handle_t *hdl, char *rsrcname, id_t id, uint_t flags,
162 char **infostr, char **errstr, nvlist_t *props, rcm_info_t **dependent)
163 {
164 dump_conf_t *dc;
165 int conf_flags;
166
167 assert(rsrcname != NULL && infostr != NULL);
168
169 (void) mutex_lock(&cache_lock);
170 if ((dc = cache_lookup(rsrcname)) == NULL) {
171 (void) mutex_unlock(&cache_lock);
172 rcm_log_message(RCM_ERROR, "unknown resource: %s\n",
173 rsrcname);
174 return (RCM_FAILURE);
175 }
176 conf_flags = dc->conf_flags;
177 (void) mutex_unlock(&cache_lock);
178
179 return ((alloc_usage(infostr, conf_flags) == 0) ?
180 RCM_SUCCESS : RCM_FAILURE);
181 }
182
183 /*
184 * Relocate dump device to maintain availability during suspension.
185 * Fail request if unable to relocate.
186 */
187 /*ARGSUSED*/
188 static int
189 dump_suspend(rcm_handle_t *hdl, char *rsrcname, id_t id, timespec_t *interval,
190 uint_t flags, char **errstr, rcm_info_t **dependent)
191 {
192 dump_conf_t *dc;
193 int rv;
194
195 assert(rsrcname != NULL && errstr != NULL);
196
197 if (flags & RCM_QUERY)
198 return (RCM_SUCCESS);
199
200 (void) mutex_lock(&cache_lock);
201 if ((dc = cache_lookup(rsrcname)) == NULL) {
202 (void) mutex_unlock(&cache_lock);
203 return (RCM_SUCCESS);
204 }
205
206 rv = dump_relocate(dc, errstr);
207 (void) mutex_unlock(&cache_lock);
208
209 return (rv);
210 }
211
212 /*ARGSUSED*/
213 static int
214 dump_resume(rcm_handle_t *hdl, char *rsrcname, id_t id, uint_t flags,
215 char **errstr, rcm_info_t **dependent)
216 {
217 dump_conf_t *dc;
218 int rv;
219
220 assert(rsrcname != NULL && errstr != NULL);
221
222 (void) mutex_lock(&cache_lock);
223 if ((dc = cache_lookup(rsrcname)) == NULL) {
224 (void) mutex_unlock(&cache_lock);
225 return (RCM_SUCCESS);
226 }
227
228 rv = dump_configure(dc, errstr);
229 (void) mutex_unlock(&cache_lock);
230
231 return (rv);
232 }
233
234 /*
235 * By default, reject offline. If offline request is
236 * forced, attempt to relocate the dump device.
237 */
238 /*ARGSUSED*/
239 static int
240 dump_offline(rcm_handle_t *hdl, char *rsrcname, id_t id, uint_t flags,
241 char **errstr, rcm_info_t **dependent)
242 {
243 dump_conf_t *dc;
244 int conf_flags;
245 int rv;
246
247 assert(rsrcname != NULL && errstr != NULL);
248
249 if ((flags & RCM_FORCE) && (flags & RCM_QUERY))
250 return (RCM_SUCCESS);
251
252 (void) mutex_lock(&cache_lock);
253 if ((dc = cache_lookup(rsrcname)) == NULL) {
254 (void) mutex_unlock(&cache_lock);
255 return (RCM_SUCCESS);
256 }
257
258 if (flags & RCM_FORCE) {
259 rv = dump_relocate(dc, errstr);
260 (void) mutex_unlock(&cache_lock);
261 return (rv);
262 }
263
264 /* default */
265 conf_flags = dc->conf_flags;
266 (void) mutex_unlock(&cache_lock);
267 (void) alloc_usage(errstr, conf_flags);
268
269 return (RCM_FAILURE);
270 }
271
272 /*ARGSUSED*/
273 static int
274 dump_online(rcm_handle_t *hdl, char *rsrcname, id_t id, uint_t flags,
275 char **errstr, rcm_info_t **dependent)
276 {
277 dump_conf_t *dc;
278 int rv;
279
280 assert(rsrcname != NULL && errstr != NULL);
281
282 (void) mutex_lock(&cache_lock);
283 if ((dc = cache_lookup(rsrcname)) == NULL) {
284 (void) mutex_unlock(&cache_lock);
285 return (RCM_SUCCESS);
286 }
287
288 rv = dump_configure(dc, errstr);
289 (void) mutex_unlock(&cache_lock);
290
291 return (rv);
292 }
293
294 /*ARGSUSED*/
295 static int
296 dump_remove(rcm_handle_t *hdl, char *rsrcname, id_t id, uint_t flags,
297 char **errstr, rcm_info_t **dependent)
298 {
299 dump_conf_t *dc;
300
301 assert(rsrcname != NULL && errstr != NULL);
302
303 (void) mutex_lock(&cache_lock);
304 if ((dc = cache_lookup(rsrcname)) == NULL) {
305 (void) mutex_unlock(&cache_lock);
306 return (RCM_SUCCESS);
307 }
308 cache_remove(dc);
309 free(dc);
310 (void) mutex_unlock(&cache_lock);
311
312 return (RCM_SUCCESS);
313 }
314
315 /*
316 * For dedicated dump devices, invoke dumpadm(1M)
317 * to relocate dump to swap. For dump device on
318 * swap, this is a no-op as the RCM swap module
319 * will relocate by invoking swap(1M).
320 *
321 * Call with cache_lock held.
322 */
323 static int
324 dump_relocate(dump_conf_t *dc, char **errstr)
325 {
326 int stat;
327
328 /*
329 * This state may get out of sync for a dump device on swap,
330 * since we will will not know if the swap module succeeds.
331 * Worst case is we end up invoking dumpadm to configure
332 * the same device during a rollback.
333 */
334 dc->cache_flags |= DUMP_CACHE_OFFLINED;
335
336 /* RCM swap module will handle non-dedicated */
337 if (!(dc->conf_flags & DUMP_EXCL))
338 return (RCM_SUCCESS);
339
340 rcm_log_message(RCM_TRACE1, "%s\n", DUMPADM_SWAP);
341 if ((stat = rcm_exec_cmd(DUMPADM_SWAP)) != 0) {
342 log_cmd_status(stat);
343 *errstr = strdup(gettext("unable to relocate dump device"));
344 dc->cache_flags &= ~DUMP_CACHE_OFFLINED;
345 return (RCM_FAILURE);
346 }
347
348 return (RCM_SUCCESS);
349 }
350
351 /*
352 * (Re)Configure dump device.
353 * Call with cache_lock held.
354 */
355 static int
356 dump_configure(dump_conf_t *dc, char **errstr)
357 {
358 char cmd[sizeof (DUMPADM) + MAXPATHLEN];
359 int stat;
360
361 assert(dc != NULL && dc->device != NULL);
362
363 /* minor optimization */
364 if (!(dc->cache_flags & DUMP_CACHE_OFFLINED))
365 return (RCM_SUCCESS);
366
367 (void) snprintf(cmd, sizeof (cmd), "%s%s", DUMPADM, dc->device);
368 rcm_log_message(RCM_TRACE1, "%s\n", cmd);
369 if ((stat = rcm_exec_cmd(cmd)) != 0) {
370 log_cmd_status(stat);
371 *errstr = strdup(gettext("unable to configure dump device"));
372 return (RCM_FAILURE);
373 }
374 dc->cache_flags &= ~DUMP_CACHE_OFFLINED;
375
376 return (RCM_SUCCESS);
377 }
378
379 /*
380 * Returns current dump configuration
381 */
382 static dump_conf_t *
383 dump_conf_alloc(void)
384 {
385 dump_conf_t *dc;
386 struct stat sbuf;
387 int fd;
388 char *err;
389
390 if ((dc = calloc(1, sizeof (*dc))) == NULL) {
391 rcm_log_message(RCM_ERROR, "calloc failure\n");
392 return (NULL);
393 }
394
395 if ((fd = open("/dev/dump", O_RDONLY)) == -1) {
396 /*
397 * Suppress reporting if no logical link.
398 */
399 if (stat("/dev/dump", &sbuf) == 0 &&
400 (fd = open("/dev/dump", O_RDONLY)) == -1) {
401 rcm_log_message(RCM_ERROR,
402 "failed to open /dev/dump: %s\n",
403 ((err = strerror(errno)) == NULL) ? "" : err);
404 }
405
406 if (fd == -1) {
407 free(dc);
408 return (NULL);
409 }
410 }
411
412 if (ioctl(fd, DIOCGETDEV, dc->device) == -1) {
413 if (errno == ENODEV) {
414 dc->device[0] = '\0';
415 } else {
416 rcm_log_message(RCM_ERROR, "ioctl: %s\n",
417 ((err = strerror(errno)) == NULL) ? "" : err);
418 (void) close(fd);
419 free(dc);
420 return (NULL);
421 }
422 }
423
424 if (dc->device[0] != '\0') {
425 if ((dc->conf_flags = ioctl(fd, DIOCGETCONF, 0)) == -1) {
426 rcm_log_message(RCM_ERROR, "ioctl: %s\n",
427 ((err = strerror(errno)) == NULL) ? "" : err);
428 (void) close(fd);
429 free(dc);
430 return (NULL);
431 }
432 }
433 (void) close(fd);
434
435 return (dc);
436 }
437
438 static int
439 update_cache(rcm_handle_t *hdl)
440 {
441 dump_conf_t *ent, *curr_dump, *tmp;
442 int rv = RCM_SUCCESS;
443
444 if ((curr_dump = dump_conf_alloc()) == NULL)
445 return (RCM_FAILURE);
446
447 (void) mutex_lock(&cache_lock);
448
449 /*
450 * pass 1 - mark all current registrations stale
451 */
452 for (ent = cache; ent != NULL; ent = ent->next) {
453 ent->cache_flags |= DUMP_CACHE_STALE;
454 }
455
456 /*
457 * update current dump conf
458 */
459 if (curr_dump->device[0] == '\0') {
460 free(curr_dump);
461 } else if ((ent = cache_lookup(curr_dump->device)) != NULL) {
462 ent->cache_flags &= ~DUMP_CACHE_STALE;
463 ent->conf_flags = curr_dump->conf_flags;
464 free(curr_dump);
465 } else {
466 curr_dump->cache_flags |= DUMP_CACHE_NEW;
467 cache_insert(curr_dump);
468 }
469
470 /*
471 * pass 2 - register, unregister, or no-op based on cache flags
472 */
473 ent = cache;
474 while (ent != NULL) {
475 if (ent->cache_flags & DUMP_CACHE_OFFLINED) {
476 ent = ent->next;
477 continue;
478 }
479
480 if (ent->cache_flags & DUMP_CACHE_STALE) {
481 if (rcm_unregister_interest(hdl, ent->device, 0) !=
482 RCM_SUCCESS) {
483 rcm_log_message(RCM_ERROR, "failed to "
484 "unregister %s\n", ent->device);
485 }
486 tmp = ent;
487 ent = ent->next;
488 cache_remove(tmp);
489 free(tmp);
490 continue;
491 }
492
493 if (!(ent->cache_flags & DUMP_CACHE_NEW)) {
494 ent = ent->next;
495 continue;
496 }
497
498 if (rcm_register_interest(hdl, ent->device, 0, NULL) !=
499 RCM_SUCCESS) {
500 rcm_log_message(RCM_ERROR, "failed to register "
501 "%s\n", ent->device);
502 rv = RCM_FAILURE;
503 } else {
504 rcm_log_message(RCM_DEBUG, "registered %s\n",
505 ent->device);
506 ent->cache_flags &= ~DUMP_CACHE_NEW;
507 }
508 ent = ent->next;
509 }
510 (void) mutex_unlock(&cache_lock);
511
512 return (rv);
513 }
514
515 /*
516 * Call with cache_lock held.
517 */
518 static dump_conf_t *
519 cache_lookup(char *rsrc)
520 {
521 dump_conf_t *dc;
522
523 for (dc = cache; dc != NULL; dc = dc->next) {
524 if (strcmp(rsrc, dc->device) == 0) {
525 return (dc);
526 }
527 }
528 return (NULL);
529 }
530
531 /*
532 * Link to front of list.
533 * Call with cache_lock held.
534 */
535 static void
536 cache_insert(dump_conf_t *ent)
537 {
538 ent->next = cache;
539 if (ent->next)
540 ent->next->prev = ent;
541 ent->prev = NULL;
542 cache = ent;
543 }
544
545 /*
546 * Call with cache_lock held.
547 */
548 static void
549 cache_remove(dump_conf_t *ent)
550 {
551 if (ent->next != NULL) {
552 ent->next->prev = ent->prev;
553 }
554 if (ent->prev != NULL) {
555 ent->prev->next = ent->next;
556 } else {
557 cache = ent->next;
558 }
559 ent->next = NULL;
560 ent->prev = NULL;
561 }
562
563 static void
564 free_cache(void)
565 {
566 dump_conf_t *dc;
567
568 (void) mutex_lock(&cache_lock);
569 while ((dc = cache) != NULL) {
570 cache = cache->next;
571 free(dc);
572 }
573 (void) mutex_unlock(&cache_lock);
574 }
575
576 static int
577 alloc_usage(char **cpp, int conf_flags)
578 {
579 /* simplifies message translation */
580 if (conf_flags & DUMP_EXCL) {
581 *cpp = strdup(gettext("dump device (dedicated)"));
582 } else {
583 *cpp = strdup(gettext("dump device (swap)"));
584 }
585
586 if (*cpp == NULL) {
587 rcm_log_message(RCM_ERROR, "strdup failure\n");
588 return (-1);
589 }
590 return (0);
591 }
592
593 static void
594 log_cmd_status(int stat)
595 {
596 char *err;
597
598 if (stat == -1) {
599 rcm_log_message(RCM_ERROR, "wait: %s\n",
600 ((err = strerror(errno)) == NULL) ? "" : err);
601 } else if (WIFEXITED(stat)) {
602 rcm_log_message(RCM_ERROR, "exit status: %d\n",
603 WEXITSTATUS(stat));
604 } else {
605 rcm_log_message(RCM_ERROR, "wait status: %d\n", stat);
606 }
607 }
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