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comparison usr/src/cmd/lvm/rpc.metamhd/mhd_set.c @ 0:c9caec207d52 b86

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Initial porting based on b86
author Koji Uno <koji.uno@sun.com>
date Tue, 02 Jun 2009 18:56:50 +0900
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children 1a15d5aaf794
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-1:000000000000 0:c9caec207d52
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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "@(#)mhd_set.c 2.6 05/06/08 SMI"
28
29 #include "mhd_local.h"
30
31 /*
32 * manipulate set list
33 */
34
35 /*
36 * global set list
37 */
38 static mutex_t mhd_set_mx = DEFAULTMUTEX;
39 static uint_t mhd_nset = 0;
40 static mhd_drive_set_t **mhd_sets = NULL;
41
42 /*
43 * add drive to set
44 */
45 void
46 mhd_add_drive_to_set(
47 mhd_drive_set_t *sp,
48 mhd_drive_t *dp
49 )
50 {
51 mhd_drive_list_t *dlp = &sp->sr_drives;
52
53 /* check locks */
54 assert(MUTEX_HELD(&mhd_set_mx));
55 assert(MUTEX_HELD(&sp->sr_mx));
56 assert(DRIVE_IS_IDLE(dp));
57
58 /* add to set */
59 mhd_add_drive(dlp, dp);
60
61 /* adjust backlink */
62 dp->dr_sp = sp;
63 }
64
65 /*
66 * delete drive from set
67 */
68 void
69 mhd_del_drive_from_set(
70 mhd_drive_t *dp
71 )
72 {
73 mhd_drive_set_t *sp = dp->dr_sp;
74 mhd_drive_list_t *dlp = &sp->sr_drives;
75
76 /* check locks */
77 assert(MUTEX_HELD(&mhd_set_mx));
78 assert(MUTEX_HELD(&sp->sr_mx));
79 assert(DRIVE_IS_IDLE(dp));
80
81 /* delete from set */
82 mhd_del_drive(dlp, dp);
83
84 /* adjust backlink */
85 dp->dr_sp = NULL;
86 }
87
88 /*
89 * find set in list
90 */
91 static mhd_drive_set_t *
92 mhd_find_set(
93 char *setname
94 )
95 {
96 uint_t i;
97
98 /* check lock */
99 assert(MUTEX_HELD(&mhd_set_mx));
100
101 /* look for set */
102 for (i = 0; (i < mhd_nset); ++i) {
103 mhd_drive_set_t *sp = mhd_sets[i];
104
105 if (strcmp(setname, sp->sr_name) == 0)
106 return (sp);
107 }
108
109 /* not found */
110 return (NULL);
111 }
112
113 /*
114 * wait for operation to complete
115 */
116 static void
117 mhd_wait_set(
118 mhd_drive_set_t *sp,
119 mhd_drive_list_t *dlp,
120 mhd_state_t state
121 )
122 {
123 /* check lock */
124 assert(MUTEX_HELD(&mhd_set_mx));
125 assert(MUTEX_HELD(&sp->sr_mx));
126
127 /* wait for complete */
128 for (;;) {
129 uint_t cnt = 0;
130 uint_t i;
131
132 /* kick threads */
133 for (i = 0; (i < dlp->dl_ndrive); ++i) {
134 mhd_drive_t *dp = dlp->dl_drives[i];
135
136 /* IDLE or ERRORED */
137 if (state == DRIVE_IDLE) {
138 if (DRIVE_IS_IDLE(dp))
139 continue;
140 }
141
142 /* operation complete */
143 else {
144 if (! (dp->dr_state & state))
145 continue;
146 }
147
148 /* kick thread */
149 mhd_cv_broadcast(&dp->dr_cv);
150 ++cnt;
151 }
152
153 /* if complete, quit */
154 if (cnt == 0)
155 break;
156
157 /* wait for something to happen */
158 (void) mhd_cv_wait(&sp->sr_cv, &sp->sr_mx);
159 }
160 }
161
162 /*
163 * idle set
164 */
165 static int
166 mhd_idle_set(
167 mhd_drive_set_t *sp,
168 mhd_drive_list_t *dlp,
169 mhd_error_t *mhep
170 )
171 {
172 uint_t i;
173
174 /* check lock */
175 assert(MUTEX_HELD(&mhd_set_mx));
176 assert(MUTEX_HELD(&sp->sr_mx));
177
178 /* disarm any failfast */
179 if (dlp->dl_ndrive >= sp->sr_drives.dl_ndrive) {
180 if (mhd_ff_disarm(sp, mhep) != 0)
181 return (-1);
182 }
183
184 /* set IDLING */
185 for (i = 0; (i < dlp->dl_ndrive); ++i) {
186 mhd_drive_t *dp = dlp->dl_drives[i];
187
188 if (! DRIVE_IS_IDLE(dp)) {
189 if (mhd_state(dp, DRIVE_IDLING, mhep) != 0)
190 return (-1);
191 }
192 }
193
194 /* wait for IDLE */
195 mhd_wait_set(sp, dlp, DRIVE_IDLE);
196
197 /* return success */
198 return (0);
199 }
200
201 /*
202 * create or update new set
203 */
204 mhd_drive_set_t *
205 mhd_create_set(
206 mhd_set_t *mhsp,
207 mhd_opts_t options,
208 mhd_drive_list_t *dlp,
209 mhd_error_t *mhep
210 )
211 {
212 char *setname;
213 mhd_drive_set_t *sp;
214 mhd_drive_list_t *sp_dlp;
215 mhd_drive_set_t *null_sp;
216 uint_t i;
217
218 /* check locks */
219 assert(MUTEX_HELD(&mhd_set_mx));
220
221 /* get setname */
222 if (mhsp == NULL)
223 setname = "";
224 else
225 setname = mhsp->setname;
226
227 /* find or create set */
228 if ((sp = mhd_find_set(setname)) == NULL) {
229 /* allocate and initialize set */
230 sp = Zalloc(sizeof (*sp));
231 sp->sr_name = Strdup(setname);
232 mhd_mx_init(&sp->sr_mx);
233 mhd_cv_init(&sp->sr_cv);
234 sp->sr_ff = -1;
235
236 /* append to set list */
237 ++mhd_nset;
238 mhd_sets = Realloc(mhd_sets, (mhd_nset * sizeof (*mhd_sets)));
239 mhd_sets[mhd_nset - 1] = sp;
240 }
241 sp_dlp = &sp->sr_drives;
242
243 /* if just grabbing null set, return */
244 if (mhsp == NULL)
245 return (sp);
246 assert(strcmp(setname, "") != 0);
247 assert(mhep != NULL);
248
249 /* get null set */
250 null_sp = mhd_create_set(NULL, 0, NULL, NULL);
251 assert(null_sp != NULL);
252 assert(sp != null_sp);
253
254 /* grab set lock */
255 mhd_mx_lock(&sp->sr_mx);
256
257 /* save options */
258 if (options & MHD_SERIAL)
259 sp->sr_options |= MHD_SERIAL;
260 else
261 sp->sr_options &= ~MHD_SERIAL;
262
263 /* move drives no longer in set to null set */
264 if (! (options & MHD_PARTIAL_SET)) {
265 for (i = 0; (i < sp_dlp->dl_ndrive); /* void */) {
266 mhd_drive_t *dp = sp_dlp->dl_drives[i];
267 uint_t j;
268
269 /* check still there */
270 for (j = 0; (j < mhsp->drives.drives_len); ++j) {
271 mhd_drivename_t mhdp;
272
273 mhdp = mhsp->drives.drives_val[j];
274 if (strcmp(dp->dr_rname, mhdp) == 0)
275 break;
276 }
277 if (j < mhsp->drives.drives_len) {
278 ++i;
279 continue;
280 }
281
282 /* idle the drive */
283 if (mhd_idle(dp, mhep) != 0)
284 mhd_clrerror(mhep);
285
286 /* move to null set */
287 mhd_del_drive_from_set(dp);
288 mhd_mx_unlock(&sp->sr_mx);
289 mhd_mx_lock(&null_sp->sr_mx);
290 mhd_add_drive_to_set(null_sp, dp);
291 mhd_mx_unlock(&null_sp->sr_mx);
292 mhd_mx_lock(&sp->sr_mx);
293 }
294 }
295
296 /* add new drives to lists */
297 for (i = 0; (i < mhsp->drives.drives_len); ++i) {
298 mhd_drivename_t mhdp = mhsp->drives.drives_val[i];
299 uint_t j;
300 mhd_drive_t *dp;
301
302 /* check already there */
303 for (j = 0; (j < dlp->dl_ndrive); ++j) {
304 dp = dlp->dl_drives[j];
305 if (strcmp(mhdp, dp->dr_rname) == 0)
306 break;
307 }
308 if (j < dlp->dl_ndrive) {
309 mhd_add_drive(dlp, dp);
310 continue;
311 }
312
313 /* add drive to set */
314 if ((dp = mhd_create_drive(sp, mhdp, NULL, mhep)) == NULL) {
315 mhde_perror(mhep, "mhd_create_drive: %s", mhdp);
316 continue;
317 }
318 mhd_add_drive(dlp, dp);
319 }
320
321 /* debug */
322 #ifdef MHD_DEBUG
323 if (mhd_debug > 0) {
324 for (i = 0; (i < mhd_nset); ++i) {
325 mhd_drive_set_t *sp = mhd_sets[i];
326 mhd_drive_list_t *dlp = &sp->sr_drives;
327 char buf[10240];
328 uint_t j;
329
330 (void) snprintf(buf, sizeof (buf), "set '%s':",
331 sp->sr_name);
332 for (j = 0; (j < dlp->dl_ndrive); ++j) {
333 mhd_drive_t *dp = dlp->dl_drives[j];
334 char *p;
335
336 if ((p = strrchr(dp->dr_rname, '/')) != NULL)
337 ++p;
338 else
339 p = dp->dr_rname;
340 (void) strncat(buf, " ", sizeof (buf));
341 (void) strncat(buf, p, sizeof (buf));
342 }
343 buf[sizeof (buf) - 1] = '\0';
344 mhd_eprintf("%s\n", buf);
345 }
346 }
347 #endif /* MHD_DEBUG */
348
349 /* unlock, return set */
350 mhd_mx_unlock(&sp->sr_mx);
351 return (sp);
352 }
353
354 /*
355 * find drive
356 */
357 mhd_drive_t *
358 mhd_find_drive(
359 char *rname
360 )
361 {
362 uint_t i;
363
364 /* check locks */
365 assert(MUTEX_HELD(&mhd_set_mx));
366
367 /* for each set */
368 for (i = 0; (i < mhd_nset); ++i) {
369 mhd_drive_set_t *sp = mhd_sets[i];
370 mhd_drive_list_t *dlp = &sp->sr_drives;
371 uint_t j;
372
373 /* for each drive */
374 for (j = 0; (j < dlp->dl_ndrive); ++j) {
375 mhd_drive_t *dp = dlp->dl_drives[j];
376
377 if (strcmp(rname, dp->dr_rname) == 0)
378 return (dp);
379 }
380 }
381
382 /* not found */
383 return (NULL);
384 }
385
386 /*
387 * list all the drives
388 */
389 int
390 mhd_list_drives(
391 char *path,
392 mhd_did_flags_t flags,
393 mhd_list_res_t *resultsp,
394 mhd_error_t *mhep
395 )
396 {
397 mhd_state_t state;
398 uint_t ndrive, i, j, c;
399
400 /* grab lock */
401 mhd_mx_lock(&mhd_set_mx);
402
403 /* add path to list */
404 if (mhd_create_drives(path, mhep) != 0) {
405 mhd_mx_unlock(&mhd_set_mx);
406 return (-1);
407 }
408
409 /* get what we want */
410 state = 0;
411 if (flags & MHD_DID_SERIAL)
412 state |= DRIVE_SERIALING;
413 if (flags & MHD_DID_TIME)
414 state |= DRIVE_VTOCING;
415 if (flags & MHD_DID_CINFO)
416 state |= DRIVE_CINFOING;
417
418 /* ident and count drives */
419 for (ndrive = 0, i = 0; (i < mhd_nset); ++i) {
420 mhd_drive_set_t *sp = mhd_sets[i];
421 mhd_drive_list_t *dlp = &sp->sr_drives;
422
423 /* count drives */
424 ndrive += dlp->dl_ndrive;
425
426 /* ident drives */
427 if (state != 0) {
428 mhd_mx_lock(&sp->sr_mx);
429 for (j = 0; (j < dlp->dl_ndrive); ++j) {
430 mhd_drive_t *dp = dlp->dl_drives[j];
431
432 if (mhd_state_set(dp, state, mhep) != 0) {
433 mhd_mx_unlock(&sp->sr_mx);
434 mhd_mx_unlock(&mhd_set_mx);
435 return (-1);
436 }
437 }
438 mhd_wait_set(sp, dlp, state);
439 mhd_mx_unlock(&sp->sr_mx);
440 }
441 }
442
443 /* build list */
444 assert(resultsp->results.mhd_drive_info_list_t_len == 0);
445 assert(resultsp->results.mhd_drive_info_list_t_val == NULL);
446 resultsp->results.mhd_drive_info_list_t_len = ndrive;
447 resultsp->results.mhd_drive_info_list_t_val = Zalloc(
448 ndrive * sizeof (*resultsp->results.mhd_drive_info_list_t_val));
449 for (c = 0, i = 0; (i < mhd_nset); ++i) {
450 mhd_drive_set_t *sp = mhd_sets[i];
451 mhd_drive_list_t *dlp = &sp->sr_drives;
452
453 mhd_mx_lock(&sp->sr_mx);
454 for (j = 0; (j < dlp->dl_ndrive); ++j) {
455 mhd_drive_t *dp = dlp->dl_drives[j];
456 mhd_drive_info_t *ip =
457 &resultsp->results.mhd_drive_info_list_t_val[c++];
458
459 ip->dif_name = Strdup(dp->dr_rname);
460 ip->dif_id = dp->dr_drive_id;
461 }
462 mhd_mx_unlock(&sp->sr_mx);
463 }
464 assert(c == ndrive);
465
466 /* unlock, return count */
467 mhd_mx_unlock(&mhd_set_mx);
468 return (ndrive);
469 }
470
471 /*
472 * release drives
473 */
474 static int
475 mhd_release_set(
476 mhd_drive_set_t *sp,
477 mhd_drive_list_t *dlp,
478 mhd_error_t *mhep
479 )
480 {
481 uint_t i;
482
483 /* check locks */
484 assert(MUTEX_HELD(&mhd_set_mx));
485 assert(MUTEX_HELD(&sp->sr_mx));
486
487 /* idle set */
488 if (mhd_idle_set(sp, dlp, mhep) != 0)
489 return (-1);
490
491 /* release drives */
492 for (i = 0; (i < dlp->dl_ndrive); i++) {
493 mhd_drive_t *dp = dlp->dl_drives[i];
494
495 if (mhd_state(dp, DRIVE_RELEASING, mhep) != 0)
496 return (-1);
497 }
498 mhd_wait_set(sp, dlp, DRIVE_IDLE);
499
500 /* return success */
501 return (0);
502 }
503
504 /*
505 * release drives in set
506 */
507 int
508 mhd_release_drives(
509 mhd_set_t *mhsp,
510 mhd_opts_t options,
511 mhd_error_t *mhep
512 )
513 {
514 mhd_drive_list_t dl = mhd_null_list;
515 mhd_drive_set_t *sp;
516 int rval;
517
518 /* grab global lock */
519 mhd_mx_lock(&mhd_set_mx);
520
521 /* create or update set */
522 if ((sp = mhd_create_set(mhsp, options, &dl, mhep)) == NULL) {
523 mhd_mx_unlock(&mhd_set_mx);
524 mhd_free_list(&dl);
525 return (-1);
526 }
527
528 /* lock set */
529 mhd_mx_lock(&sp->sr_mx);
530
531 /* release drives */
532 rval = mhd_release_set(sp, &dl, mhep);
533
534 /* unlock, return success */
535 out:
536 mhd_mx_unlock(&sp->sr_mx);
537 mhd_mx_unlock(&mhd_set_mx);
538 mhd_free_list(&dl);
539 return (rval);
540 }
541
542 /*
543 * reserve drives
544 */
545 static int
546 mhd_reserve_set(
547 mhd_drive_set_t *sp,
548 mhd_drive_list_t *dlp,
549 mhd_error_t *mhep
550 )
551 {
552 mhd_msec_t ff = sp->sr_timeouts.mh_ff;
553 uint_t retry, i, ok;
554 int rval = 0;
555
556 /* check locks */
557 assert(MUTEX_HELD(&mhd_set_mx));
558 assert(MUTEX_HELD(&sp->sr_mx));
559
560 /* idle set, idle everyone if cancelling failfast */
561 if (ff == 0) {
562 if (mhd_idle_set(sp, &sp->sr_drives, mhep) != 0)
563 return (-1);
564 } else {
565 if (mhd_idle_set(sp, dlp, mhep) != 0)
566 return (-1);
567 }
568
569 /*
570 * Try to take ownership of the drives twice. This helps
571 * to avoid the situation where the other machine retakes
572 * ownership of a majority drives back, but then kills itself
573 * leaving no owners.
574 */
575 for (retry = 0; (retry < 2); ++retry) {
576 for (i = 0; (i < dlp->dl_ndrive); i++) {
577 mhd_drive_t *dp = dlp->dl_drives[i];
578
579 if ((retry == 0) ||
580 ((dp->dr_state == DRIVE_ERRORED) &&
581 (dp->dr_errnum == EACCES))) {
582 if (mhd_state(dp, DRIVE_RESERVING, mhep) != 0)
583 return (-1);
584 }
585 }
586 mhd_wait_set(sp, dlp, DRIVE_IDLE);
587 }
588
589 /*
590 * Did the take ownership succeed on a majority of the drives?
591 */
592 ok = 0;
593 for (i = 0; (i < dlp->dl_ndrive); ++i) {
594 mhd_drive_t *dp = dlp->dl_drives[i];
595
596 if (dp->dr_state == DRIVE_IDLE)
597 ++ok;
598 }
599
600 /*
601 * Let the replica majority be the deciding factor, if able to get
602 * at least a single drive reserved.
603 */
604 if (ok == 0) {
605 rval = mhd_error(mhep, MHD_E_MAJORITY, sp->sr_name);
606 goto out;
607 }
608
609 /*
610 * Enable the failfast probes if we haven't given up yet.
611 */
612 switch (sp->sr_ff_mode) {
613
614 /* do nothing */
615 default:
616 assert(0);
617 /* FALLTHROUGH */
618 case MHD_FF_NONE:
619 goto out;
620
621 /* old style per drive failfast */
622 case MHD_FF_DRIVER:
623 for (i = 0; (i < dlp->dl_ndrive); i++) {
624 mhd_drive_t *dp = dlp->dl_drives[i];
625
626 if (dp->dr_state != DRIVE_ERRORED) {
627 if (mhd_state(dp, DRIVE_FAILFASTING,
628 mhep) != 0) {
629 rval = -1;
630 goto out;
631 }
632 }
633 }
634 mhd_wait_set(sp, dlp, DRIVE_IDLE);
635 break;
636
637 /* failfast probe threads */
638 case MHD_FF_DEBUG:
639 case MHD_FF_HALT:
640 case MHD_FF_PANIC:
641 if (ff != 0) {
642 if (mhd_ff_open(sp, mhep) != 0) {
643 rval = -1;
644 goto out;
645 }
646 for (i = 0; (i < dlp->dl_ndrive); i++) {
647 mhd_drive_t *dp = dlp->dl_drives[i];
648
649 if (mhd_state_set(dp, DRIVE_PROBING,
650 mhep) != 0) {
651 rval = -1;
652 goto out;
653 }
654 dp->dr_time = mhd_time();
655 }
656 (void) mhd_ff_rearm(sp, mhep);
657 }
658 break;
659 }
660
661 /* cleanup, return success */
662 out:
663 if (rval != 0) {
664 mhd_error_t status = mhd_null_error;
665
666 (void) mhd_release_set(sp, dlp, &status);
667 mhd_clrerror(&status);
668 }
669 return (rval);
670 }
671
672 /*
673 * reserve drives in set
674 */
675 int
676 mhd_reserve_drives(
677 mhd_set_t *mhsp,
678 mhd_mhiargs_t *timeoutp,
679 mhd_ff_mode_t ff_mode,
680 mhd_opts_t options,
681 mhd_error_t *mhep
682 )
683 {
684 mhd_drive_list_t dl = mhd_null_list;
685 mhd_drive_set_t *sp;
686 int rval;
687
688 /* grab global lock */
689 mhd_mx_lock(&mhd_set_mx);
690
691 /* create or update set */
692 if ((sp = mhd_create_set(mhsp, options, &dl, mhep)) == NULL) {
693 mhd_mx_unlock(&mhd_set_mx);
694 mhd_free_list(&dl);
695 return (-1);
696 }
697
698 /* lock set */
699 mhd_mx_lock(&sp->sr_mx);
700
701 /* can't change mode or timeouts of partial set */
702 if ((dl.dl_ndrive != sp->sr_drives.dl_ndrive) &&
703 (options & MHD_PARTIAL_SET)) {
704 if (ff_mode != sp->sr_ff_mode) {
705 mhd_eprintf("%s: invalid ff_mode %d now %d\n",
706 sp->sr_name, ff_mode, sp->sr_ff_mode);
707 ff_mode = sp->sr_ff_mode;
708 }
709 if (timeoutp->mh_ff < sp->sr_timeouts.mh_ff) {
710 mhd_eprintf("%s: invalid mh_ff %d now %d\n",
711 sp->sr_name, timeoutp->mh_ff,
712 sp->sr_timeouts.mh_ff);
713 timeoutp->mh_ff = sp->sr_timeouts.mh_ff;
714 }
715 }
716
717 /* save timouts and mode */
718 sp->sr_timeouts = *timeoutp;
719 sp->sr_ff_mode = ff_mode;
720
721 /* reserve drives */
722 rval = mhd_reserve_set(sp, &dl, mhep);
723
724 /* unlock, return success */
725 out:
726 mhd_mx_unlock(&sp->sr_mx);
727 mhd_mx_unlock(&mhd_set_mx);
728 mhd_free_list(&dl);
729 return (rval);
730 }
731
732 /*
733 * status drives
734 */
735 static int
736 mhd_status_set(
737 mhd_drive_set_t *sp,
738 mhd_drive_list_t *dlp,
739 mhd_error_t *mhep
740 )
741 {
742 uint_t i;
743
744 /* check locks */
745 assert(MUTEX_HELD(&mhd_set_mx));
746 assert(MUTEX_HELD(&sp->sr_mx));
747
748 /* status drives */
749 for (i = 0; (i < dlp->dl_ndrive); i++) {
750 mhd_drive_t *dp = dlp->dl_drives[i];
751
752 if (mhd_state_set(dp, DRIVE_STATUSING, mhep) != 0)
753 return (-1);
754 }
755 mhd_wait_set(sp, dlp, DRIVE_STATUSING);
756
757 /* return success */
758 return (0);
759 }
760
761 /*
762 * status drives in set
763 */
764 int
765 mhd_status_drives(
766 mhd_set_t *mhsp,
767 mhd_opts_t options,
768 mhd_drive_status_t **status,
769 mhd_error_t *mhep
770 )
771 {
772 mhd_drive_list_t dl = mhd_null_list;
773 mhd_drive_list_t *dlp = &dl;
774 mhd_drive_set_t *sp;
775 uint_t i;
776 int rval = 0;
777
778 /* grab global lock */
779 mhd_mx_lock(&mhd_set_mx);
780
781 /* create or update set */
782 if ((sp = mhd_create_set(mhsp, options, &dl, mhep)) == NULL) {
783 mhd_mx_unlock(&mhd_set_mx);
784 mhd_free_list(&dl);
785 return (-1);
786 }
787
788 /* lock set */
789 mhd_mx_lock(&sp->sr_mx);
790
791 /* status drives */
792 if (mhd_status_set(sp, &dl, mhep) != 0) {
793 rval = -1;
794 goto out;
795 }
796
797 /* build list */
798 *status = Zalloc(dlp->dl_ndrive * sizeof (**status));
799 for (i = 0; (i < dlp->dl_ndrive); ++i) {
800 mhd_drive_t *dp = dlp->dl_drives[i];
801 mhd_drive_status_t *statusp = &(*status)[i];
802
803 statusp->drive = Strdup(dp->dr_rname);
804 statusp->errnum = dp->dr_errnum;
805 }
806 assert(i == dlp->dl_ndrive);
807 rval = dlp->dl_ndrive;
808
809 /* unlock, return count */
810 out:
811 mhd_mx_unlock(&sp->sr_mx);
812 mhd_mx_unlock(&mhd_set_mx);
813 mhd_free_list(&dl);
814 return (rval);
815 }