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Remove scattered checks for malloc success.
[thirdparty/mdadm.git] / Assemble.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@suse.de>
23 */
24
25 #include "mdadm.h"
26 #include <ctype.h>
27
28 static int name_matches(char *found, char *required, char *homehost)
29 {
30 /* See if the name found matches the required name, possibly
31 * prefixed with 'homehost'
32 */
33 char fnd[33];
34
35 strncpy(fnd, found, 32);
36 fnd[32] = 0;
37 if (strcmp(found, required)==0)
38 return 1;
39 if (homehost) {
40 int l = strlen(homehost);
41 if (l < 32 && fnd[l] == ':' &&
42 strcmp(fnd+l+1, required)==0)
43 return 1;
44 }
45 return 0;
46 }
47
48 static int is_member_busy(char *metadata_version)
49 {
50 /* check if the given member array is active */
51 struct mdstat_ent *mdstat = mdstat_read(1, 0);
52 struct mdstat_ent *ent;
53 int busy = 0;
54
55 for (ent = mdstat; ent; ent = ent->next) {
56 if (ent->metadata_version == NULL)
57 continue;
58 if (strncmp(ent->metadata_version, "external:", 9) != 0)
59 continue;
60 if (!is_subarray(&ent->metadata_version[9]))
61 continue;
62 /* Skip first char - it can be '/' or '-' */
63 if (strcmp(&ent->metadata_version[10], metadata_version+1) == 0) {
64 busy = 1;
65 break;
66 }
67 }
68 free_mdstat(mdstat);
69
70 return busy;
71 }
72
73 static int ident_matches(struct mddev_ident *ident,
74 struct mdinfo *content,
75 struct supertype *tst,
76 char *homehost,
77 char *update, char *devname)
78 {
79
80 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
81 same_uuid(content->uuid, ident->uuid, tst->ss->swapuuid)==0 &&
82 memcmp(content->uuid, uuid_zero, sizeof(int[4])) != 0) {
83 if (devname)
84 pr_err("%s has wrong uuid.\n", devname);
85 return 0;
86 }
87 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
88 name_matches(content->name, ident->name, homehost)==0) {
89 if (devname)
90 pr_err("%s has wrong name.\n", devname);
91 return 0;
92 }
93 if (ident->super_minor != UnSet &&
94 ident->super_minor != content->array.md_minor) {
95 if (devname)
96 pr_err("%s has wrong super-minor.\n",
97 devname);
98 return 0;
99 }
100 if (ident->level != UnSet &&
101 ident->level != content->array.level) {
102 if (devname)
103 pr_err("%s has wrong raid level.\n",
104 devname);
105 return 0;
106 }
107 if (ident->raid_disks != UnSet &&
108 ident->raid_disks!= content->array.raid_disks) {
109 if (devname)
110 pr_err("%s requires wrong number of drives.\n",
111 devname);
112 return 0;
113 }
114 if (ident->member && ident->member[0]) {
115 /* content->text_version must match */
116 char *s = strchr(content->text_version+1, '/');
117 if (s == NULL) {
118 if (devname)
119 pr_err("%s is not a container and one is required.\n",
120 devname);
121 return 0;
122 } else if (strcmp(ident->member, s+1) != 0) {
123 if (devname)
124 pr_err("skipping wrong member %s is %s\n",
125 content->text_version, devname);
126 return 0;
127 }
128 }
129 return 1;
130 }
131
132
133 int Assemble(struct supertype *st, char *mddev,
134 struct mddev_ident *ident,
135 struct mddev_dev *devlist,
136 char *backup_file, int invalid_backup,
137 int readonly, int runstop,
138 char *update, char *homehost, int require_homehost,
139 int verbose, int force, int freeze_reshape)
140 {
141 /*
142 * The task of Assemble is to find a collection of
143 * devices that should (according to their superblocks)
144 * form an array, and to give this collection to the MD driver.
145 * In Linux-2.4 and later, this involves submitting a
146 * SET_ARRAY_INFO ioctl with no arg - to prepare
147 * the array - and then submit a number of
148 * ADD_NEW_DISK ioctls to add disks into
149 * the array. Finally RUN_ARRAY might
150 * be submitted to start the array.
151 *
152 * Much of the work of Assemble is in finding and/or
153 * checking the disks to make sure they look right.
154 *
155 * If mddev is not set, then scan must be set and we
156 * read through the config file for dev+uuid mapping
157 * We recurse, setting mddev, for each device that
158 * - isn't running
159 * - has a valid uuid (or any uuid if !uuidset)
160 *
161 * If mddev is set, we try to determine state of md.
162 * check version - must be at least 0.90.0
163 * check kernel version. must be at least 2.4.
164 * If not, we can possibly fall back on START_ARRAY
165 * Try to GET_ARRAY_INFO.
166 * If possible, give up
167 * If not, try to STOP_ARRAY just to make sure
168 *
169 * If !uuidset and scan, look in conf-file for uuid
170 * If not found, give up
171 * If !devlist and scan and uuidset, get list of devs from conf-file
172 *
173 * For each device:
174 * Check superblock - discard if bad
175 * Check uuid (set if we don't have one) - discard if no match
176 * Check superblock similarity if we have a superblock - discard if different
177 * Record events, devicenum
178 * This should give us a list of devices for the array
179 * We should collect the most recent event number
180 *
181 * Count disks with recent enough event count
182 * While force && !enough disks
183 * Choose newest rejected disks, update event count
184 * mark clean and rewrite superblock
185 * If recent kernel:
186 * SET_ARRAY_INFO
187 * foreach device with recent events : ADD_NEW_DISK
188 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
189 * If old kernel:
190 * Check the device numbers in superblock are right
191 * update superblock if any changes
192 * START_ARRAY
193 *
194 */
195 int mdfd;
196 int clean;
197 int auto_assem = (mddev == NULL && !ident->uuid_set &&
198 ident->super_minor == UnSet && ident->name[0] == 0
199 && (ident->container == NULL || ident->member == NULL));
200 int old_linux = 0;
201 int vers = vers; /* Keep gcc quite - it really is initialised */
202 struct {
203 char *devname;
204 int uptodate; /* set once we decide that this device is as
205 * recent as everything else in the array.
206 */
207 struct mdinfo i;
208 } *devices;
209 char *devmap;
210 int *best = NULL; /* indexed by raid_disk */
211 int bestcnt = 0;
212 int devcnt = 0;
213 unsigned int okcnt, sparecnt, rebuilding_cnt;
214 unsigned int req_cnt;
215 int i;
216 int most_recent = 0;
217 int chosen_drive;
218 int change = 0;
219 int inargv = 0;
220 int report_missmatch;
221 #ifndef MDASSEMBLE
222 int bitmap_done;
223 #endif
224 int start_partial_ok = (runstop >= 0) &&
225 (force || devlist==NULL || auto_assem);
226 unsigned int num_devs;
227 struct mddev_dev *tmpdev;
228 struct mdinfo info;
229 struct mdinfo *content = NULL;
230 char *avail;
231 int nextspare = 0;
232 char *name = NULL;
233 int trustworthy;
234 char chosen_name[1024];
235 struct domainlist *domains = NULL;
236
237 if (get_linux_version() < 2004000)
238 old_linux = 1;
239
240 /*
241 * If any subdevs are listed, then any that don't
242 * match ident are discarded. Remainder must all match and
243 * become the array.
244 * If no subdevs, then we scan all devices in the config file, but
245 * there must be something in the identity
246 */
247
248 if (!devlist &&
249 ident->uuid_set == 0 &&
250 (ident->super_minor < 0 || ident->super_minor == UnSet) &&
251 ident->name[0] == 0 &&
252 (ident->container == NULL || ident->member == NULL) &&
253 ident->devices == NULL) {
254 pr_err("No identity information available for %s - cannot assemble.\n",
255 mddev ? mddev : "further assembly");
256 return 1;
257 }
258
259 if (devlist == NULL)
260 devlist = conf_get_devs();
261 else if (mddev)
262 inargv = 1;
263
264 report_missmatch = ((inargv && verbose >= 0) || verbose > 0);
265 try_again:
266 /* We come back here when doing auto-assembly and attempting some
267 * set of devices failed. Those are now marked as ->used==2 and
268 * we ignore them and try again
269 */
270
271 tmpdev = devlist; num_devs = 0;
272 while (tmpdev) {
273 if (tmpdev->used)
274 tmpdev->used = 2;
275 else
276 num_devs++;
277 tmpdev = tmpdev->next;
278 }
279
280 if (!st && ident->st) st = ident->st;
281
282 if (verbose>0)
283 pr_err("looking for devices for %s\n",
284 mddev ? mddev : "further assembly");
285
286 /* first walk the list of devices to find a consistent set
287 * that match the criterea, if that is possible.
288 * We flag the ones we like with 'used'.
289 */
290 for (tmpdev = devlist;
291 tmpdev;
292 tmpdev = tmpdev ? tmpdev->next : NULL) {
293 char *devname = tmpdev->devname;
294 int dfd;
295 struct stat stb;
296 struct supertype *tst;
297 struct dev_policy *pol = NULL;
298 int found_container = 0;
299
300 if (tmpdev->used > 1) continue;
301
302 if (ident->devices &&
303 !match_oneof(ident->devices, devname)) {
304 if (report_missmatch)
305 pr_err("%s is not one of %s\n", devname, ident->devices);
306 continue;
307 }
308
309 tst = dup_super(st);
310
311 dfd = dev_open(devname, O_RDONLY);
312 if (dfd < 0) {
313 if (report_missmatch)
314 pr_err("cannot open device %s: %s\n",
315 devname, strerror(errno));
316 tmpdev->used = 2;
317 } else if (fstat(dfd, &stb)< 0) {
318 /* Impossible! */
319 pr_err("fstat failed for %s: %s\n",
320 devname, strerror(errno));
321 tmpdev->used = 2;
322 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
323 pr_err("%s is not a block device.\n",
324 devname);
325 tmpdev->used = 2;
326 } else if (must_be_container(dfd)) {
327 if (st) {
328 /* already found some components, this cannot
329 * be another one.
330 */
331 if (report_missmatch)
332 pr_err("%s is a container, but we are looking for components\n",
333 devname);
334 tmpdev->used = 2;
335 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
336 } if (!tst && (tst = super_by_fd(dfd, NULL)) == NULL) {
337 if (report_missmatch)
338 pr_err("not a recognisable container: %s\n",
339 devname);
340 tmpdev->used = 2;
341 #endif
342 } else if (!tst->ss->load_container
343 || tst->ss->load_container(tst, dfd, NULL)) {
344 if (report_missmatch)
345 pr_err("no correct container type: %s\n",
346 devname);
347 tmpdev->used = 2;
348 } else if (auto_assem &&
349 !conf_test_metadata(tst->ss->name, (pol = devnum_policy(stb.st_rdev)),
350 tst->ss->match_home(tst, homehost) == 1)) {
351 if (report_missmatch)
352 pr_err("%s has metadata type %s for which "
353 "auto-assembly is disabled\n",
354 devname, tst->ss->name);
355 tmpdev->used = 2;
356 } else
357 found_container = 1;
358 } else {
359 if (!tst && (tst = guess_super(dfd)) == NULL) {
360 if (report_missmatch)
361 pr_err("no recogniseable superblock on %s\n",
362 devname);
363 tmpdev->used = 2;
364 } else if (tst->ss->load_super(tst,dfd, NULL)) {
365 if (report_missmatch)
366 pr_err("no RAID superblock on %s\n",
367 devname);
368 tmpdev->used = 2;
369 } else if (tst->ss->compare_super == NULL) {
370 if (report_missmatch)
371 pr_err("Cannot assemble %s metadata on %s\n",
372 tst->ss->name, devname);
373 tmpdev->used = 2;
374 } else if (auto_assem && st == NULL &&
375 !conf_test_metadata(tst->ss->name, (pol = devnum_policy(stb.st_rdev)),
376 tst->ss->match_home(tst, homehost) == 1)) {
377 if (report_missmatch)
378 pr_err("%s has metadata type %s for which "
379 "auto-assembly is disabled\n",
380 devname, tst->ss->name);
381 tmpdev->used = 2;
382 }
383 }
384 if (dfd >= 0) close(dfd);
385 if (tmpdev->used == 2) {
386 if (auto_assem || !inargv)
387 /* Ignore unrecognised devices during auto-assembly */
388 goto loop;
389 if (ident->uuid_set || ident->name[0] ||
390 ident->super_minor != UnSet)
391 /* Ignore unrecognised device if looking for
392 * specific array */
393 goto loop;
394
395
396 pr_err("%s has no superblock - assembly aborted\n",
397 devname);
398 if (st)
399 st->ss->free_super(st);
400 dev_policy_free(pol);
401 domain_free(domains);
402 return 1;
403 }
404
405 if (found_container) {
406 /* tmpdev is a container. We need to be either
407 * looking for a member, or auto-assembling
408 */
409 /* should be safe to try an exclusive open now, we
410 * have rejected anything that some other mdadm might
411 * be looking at
412 */
413 dfd = dev_open(devname, O_RDONLY | O_EXCL);
414 if (dfd < 0) {
415 if (report_missmatch)
416 pr_err("%s is busy - skipping\n", devname);
417 goto loop;
418 }
419 close(dfd);
420
421 if (ident->container) {
422 if (ident->container[0] == '/' &&
423 !same_dev(ident->container, devname)) {
424 if (report_missmatch)
425 pr_err("%s is not the container required (%s)\n",
426 devname, ident->container);
427 goto loop;
428 }
429 if (ident->container[0] != '/') {
430 /* we have a uuid */
431 int uuid[4];
432
433 content = &info;
434 tst->ss->getinfo_super(tst, content, NULL);
435
436 if (!parse_uuid(ident->container, uuid) ||
437 !same_uuid(content->uuid, uuid, tst->ss->swapuuid)) {
438 if (report_missmatch)
439 pr_err("%s has wrong UUID to be required container\n",
440 devname);
441 goto loop;
442 }
443 }
444 }
445 /* It is worth looking inside this container.
446 */
447 if (verbose > 0)
448 pr_err("looking in container %s\n",
449 devname);
450
451 for (content = tst->ss->container_content(tst, NULL);
452 content;
453 content = content->next) {
454
455 if (!ident_matches(ident, content, tst,
456 homehost, update,
457 report_missmatch ? devname : NULL))
458 /* message already printed */;
459 else if (is_member_busy(content->text_version)) {
460 if (report_missmatch)
461 pr_err("member %s in %s is already assembled\n",
462 content->text_version,
463 devname);
464 } else if (content->array.state & (1<<MD_SB_BLOCK_VOLUME)) {
465 /* do not assemble arrays with unsupported configurations */
466 pr_err("Cannot activate member %s in %s.\n",
467 content->text_version,
468 devname);
469 } else
470 break;
471 }
472 if (!content) {
473 tmpdev->used = 2;
474 goto loop; /* empty container */
475 }
476
477 st = tst; tst = NULL;
478 if (!auto_assem && inargv && tmpdev->next != NULL) {
479 pr_err("%s is a container, but is not "
480 "only device given: confused and aborting\n",
481 devname);
482 st->ss->free_super(st);
483 dev_policy_free(pol);
484 domain_free(domains);
485 return 1;
486 }
487 if (verbose > 0)
488 pr_err("found match on member %s in %s\n",
489 content->text_version, devname);
490
491 /* make sure we finished the loop */
492 tmpdev = NULL;
493 goto loop;
494 } else {
495
496 content = &info;
497 tst->ss->getinfo_super(tst, content, NULL);
498
499 if (!ident_matches(ident, content, tst,
500 homehost, update,
501 report_missmatch ? devname : NULL))
502 goto loop;
503
504 /* should be safe to try an exclusive open now, we
505 * have rejected anything that some other mdadm might
506 * be looking at
507 */
508 dfd = dev_open(devname, O_RDONLY | O_EXCL);
509 if (dfd < 0) {
510 if (report_missmatch)
511 pr_err("%s is busy - skipping\n", devname);
512 goto loop;
513 }
514 close(dfd);
515
516 if (st == NULL)
517 st = dup_super(tst);
518 if (st->minor_version == -1)
519 st->minor_version = tst->minor_version;
520
521 if (memcmp(content->uuid, uuid_zero,
522 sizeof(int[4])) == 0) {
523 /* this is a floating spare. It cannot define
524 * an array unless there are no more arrays of
525 * this type to be found. It can be included
526 * in an array of this type though.
527 */
528 tmpdev->used = 3;
529 goto loop;
530 }
531
532 if (st->ss != tst->ss ||
533 st->minor_version != tst->minor_version ||
534 st->ss->compare_super(st, tst) != 0) {
535 /* Some mismatch. If exactly one array matches this host,
536 * we can resolve on that one.
537 * Or, if we are auto assembling, we just ignore the second
538 * for now.
539 */
540 if (auto_assem)
541 goto loop;
542 if (homehost) {
543 int first = st->ss->match_home(st, homehost);
544 int last = tst->ss->match_home(tst, homehost);
545 if (first != last &&
546 (first == 1 || last == 1)) {
547 /* We can do something */
548 if (first) {/* just ignore this one */
549 if (report_missmatch)
550 pr_err("%s misses out due to wrong homehost\n",
551 devname);
552 goto loop;
553 } else { /* reject all those sofar */
554 struct mddev_dev *td;
555 if (report_missmatch)
556 pr_err("%s overrides previous devices due to good homehost\n",
557 devname);
558 for (td=devlist; td != tmpdev; td=td->next)
559 if (td->used == 1)
560 td->used = 0;
561 tmpdev->used = 1;
562 goto loop;
563 }
564 }
565 }
566 pr_err("superblock on %s doesn't match others - assembly aborted\n",
567 devname);
568 tst->ss->free_super(tst);
569 st->ss->free_super(st);
570 dev_policy_free(pol);
571 domain_free(domains);
572 return 1;
573 }
574 tmpdev->used = 1;
575 }
576 loop:
577 /* Collect domain information from members only */
578 if (tmpdev && tmpdev->used == 1) {
579 if (!pol)
580 pol = devnum_policy(stb.st_rdev);
581 domain_merge(&domains, pol, tst?tst->ss->name:NULL);
582 }
583 dev_policy_free(pol);
584 pol = NULL;
585 if (tst)
586 tst->ss->free_super(tst);
587 }
588
589 /* Check if we found some imsm spares but no members */
590 if ((auto_assem ||
591 (ident->uuid_set &&
592 memcmp(uuid_zero, ident->uuid,sizeof(uuid_zero)) == 0)) &&
593 (!st || !st->sb))
594 for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
595 if (tmpdev->used != 3)
596 continue;
597 tmpdev->used = 1;
598 content = &info;
599
600 if (!st->sb) {
601 /* we need sb from one of the spares */
602 int dfd = dev_open(tmpdev->devname, O_RDONLY);
603 if (dfd < 0 ||
604 st->ss->load_super(st, dfd, NULL))
605 tmpdev->used = 2;
606 if (dfd > 0)
607 close(dfd);
608 }
609 }
610
611 /* Now reject spares that don't match domains of identified members */
612 for (tmpdev = devlist; tmpdev; tmpdev = tmpdev->next) {
613 struct stat stb;
614 if (tmpdev->used != 3)
615 continue;
616 if (stat(tmpdev->devname, &stb)< 0) {
617 pr_err("fstat failed for %s: %s\n",
618 tmpdev->devname, strerror(errno));
619 tmpdev->used = 2;
620 } else {
621 struct dev_policy *pol = devnum_policy(stb.st_rdev);
622 int dt = domain_test(domains, pol, NULL);
623 if (inargv && dt != 0)
624 /* take this spare as domains match
625 * if there are any */
626 tmpdev->used = 1;
627 else if (!inargv && dt == 1)
628 /* device wasn't explicitly listed, so need
629 * explicit domain match - which we have */
630 tmpdev->used = 1;
631 else
632 /* if domains don't match mark as unused */
633 tmpdev->used = 0;
634 dev_policy_free(pol);
635 }
636 }
637 domain_free(domains);
638
639 if (!st || !st->sb || !content)
640 return 2;
641
642 /* Now need to open the array device. Use create_mddev */
643 if (content == &info)
644 st->ss->getinfo_super(st, content, NULL);
645
646 trustworthy = FOREIGN;
647 name = content->name;
648 switch (st->ss->match_home(st, homehost)
649 ?: st->ss->match_home(st, "any")) {
650 case 1:
651 trustworthy = LOCAL;
652 name = strchr(content->name, ':');
653 if (name)
654 name++;
655 else
656 name = content->name;
657 break;
658 }
659 if (!auto_assem)
660 /* If the array is listed in mdadm.conf or on
661 * command line, then we trust the name
662 * even if the array doesn't look local
663 */
664 trustworthy = LOCAL;
665
666 if (name[0] == 0 &&
667 content->array.level == LEVEL_CONTAINER) {
668 name = content->text_version;
669 trustworthy = METADATA;
670 }
671
672 if (name[0] && trustworthy != LOCAL &&
673 ! require_homehost &&
674 conf_name_is_free(name))
675 trustworthy = LOCAL;
676
677 if (trustworthy == LOCAL &&
678 strchr(name, ':'))
679 /* Ignore 'host:' prefix of name */
680 name = strchr(name, ':')+1;
681
682 mdfd = create_mddev(mddev, name, ident->autof, trustworthy,
683 chosen_name);
684 if (mdfd < 0) {
685 st->ss->free_super(st);
686 if (auto_assem)
687 goto try_again;
688 return 1;
689 }
690 mddev = chosen_name;
691 vers = md_get_version(mdfd);
692 if (vers < 9000) {
693 pr_err("Assemble requires driver version 0.90.0 or later.\n"
694 " Upgrade your kernel or try --build\n");
695 close(mdfd);
696 return 1;
697 }
698 if (mddev_busy(fd2devnum(mdfd))) {
699 pr_err("%s already active, cannot restart it!\n",
700 mddev);
701 for (tmpdev = devlist ;
702 tmpdev && tmpdev->used != 1;
703 tmpdev = tmpdev->next)
704 ;
705 if (tmpdev && auto_assem)
706 pr_err("%s needed for %s...\n",
707 mddev, tmpdev->devname);
708 close(mdfd);
709 mdfd = -3;
710 st->ss->free_super(st);
711 if (auto_assem)
712 goto try_again;
713 return 1;
714 }
715 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
716
717 #ifndef MDASSEMBLE
718 if (content != &info) {
719 /* This is a member of a container. Try starting the array. */
720 int err;
721 err = assemble_container_content(st, mdfd, content, runstop,
722 chosen_name, verbose,
723 backup_file, freeze_reshape);
724 close(mdfd);
725 return err;
726 }
727 bitmap_done = 0;
728 #endif
729 /* Ok, no bad inconsistancy, we can try updating etc */
730 devices = xcalloc(num_devs, sizeof(*devices));
731 devmap = xcalloc(num_devs, content->array.raid_disks);
732 for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
733 char *devname = tmpdev->devname;
734 struct stat stb;
735 /* looks like a good enough match to update the super block if needed */
736 #ifndef MDASSEMBLE
737 if (update) {
738 int dfd;
739 /* prepare useful information in info structures */
740 struct stat stb2;
741 struct supertype *tst;
742 int err;
743 fstat(mdfd, &stb2);
744
745 if (strcmp(update, "uuid")==0 &&
746 !ident->uuid_set) {
747 int rfd;
748 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
749 read(rfd, ident->uuid, 16) != 16) {
750 *(__u32*)(ident->uuid) = random();
751 *(__u32*)(ident->uuid+1) = random();
752 *(__u32*)(ident->uuid+2) = random();
753 *(__u32*)(ident->uuid+3) = random();
754 }
755 if (rfd >= 0) close(rfd);
756 }
757 dfd = dev_open(devname, O_RDWR|O_EXCL);
758
759 tst = dup_super(st);
760 if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
761 pr_err("cannot re-read metadata from %s - aborting\n",
762 devname);
763 if (dfd >= 0)
764 close(dfd);
765 close(mdfd);
766 free(devices);
767 free(devmap);
768 return 1;
769 }
770 tst->ss->getinfo_super(tst, content, devmap + devcnt * content->array.raid_disks);
771
772 memcpy(content->uuid, ident->uuid, 16);
773 strcpy(content->name, ident->name);
774 content->array.md_minor = minor(stb2.st_rdev);
775
776 if (strcmp(update, "byteorder") == 0)
777 err = 0;
778 else
779 err = tst->ss->update_super(tst, content, update,
780 devname, verbose,
781 ident->uuid_set,
782 homehost);
783 if (err < 0) {
784 pr_err("--update=%s not understood"
785 " for %s metadata\n",
786 update, tst->ss->name);
787 tst->ss->free_super(tst);
788 free(tst);
789 close(mdfd);
790 close(dfd);
791 free(devices);
792 free(devmap);
793 return 1;
794 }
795 if (strcmp(update, "uuid")==0 &&
796 !ident->uuid_set) {
797 ident->uuid_set = 1;
798 memcpy(ident->uuid, content->uuid, 16);
799 }
800 if (tst->ss->store_super(tst, dfd))
801 pr_err("Could not re-write superblock on %s.\n",
802 devname);
803 close(dfd);
804
805 if (strcmp(update, "uuid")==0 &&
806 ident->bitmap_fd >= 0 && !bitmap_done) {
807 if (bitmap_update_uuid(ident->bitmap_fd,
808 content->uuid,
809 tst->ss->swapuuid) != 0)
810 pr_err("Could not update uuid on external bitmap.\n");
811 else
812 bitmap_done = 1;
813 }
814 tst->ss->free_super(tst);
815 } else
816 #endif
817 {
818 struct supertype *tst = dup_super(st);
819 int dfd;
820 dfd = dev_open(devname, O_RDWR|O_EXCL);
821
822 if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
823 pr_err("cannot re-read metadata from %s - aborting\n",
824 devname);
825 if (dfd >= 0)
826 close(dfd);
827 close(mdfd);
828 free(devices);
829 free(devmap);
830 return 1;
831 }
832 tst->ss->getinfo_super(tst, content, devmap + devcnt * content->array.raid_disks);
833 tst->ss->free_super(tst);
834 close(dfd);
835 }
836
837 stat(devname, &stb);
838
839 if (verbose > 0)
840 pr_err("%s is identified as a member of %s, slot %d.\n",
841 devname, mddev, content->disk.raid_disk);
842 devices[devcnt].devname = devname;
843 devices[devcnt].uptodate = 0;
844 devices[devcnt].i = *content;
845 devices[devcnt].i.disk.major = major(stb.st_rdev);
846 devices[devcnt].i.disk.minor = minor(stb.st_rdev);
847 if (most_recent < devcnt) {
848 if (devices[devcnt].i.events
849 > devices[most_recent].i.events)
850 most_recent = devcnt;
851 }
852 if (content->array.level == LEVEL_MULTIPATH)
853 /* with multipath, the raid_disk from the superblock is meaningless */
854 i = devcnt;
855 else
856 i = devices[devcnt].i.disk.raid_disk;
857 if (i+1 == 0) {
858 if (nextspare < content->array.raid_disks)
859 nextspare = content->array.raid_disks;
860 i = nextspare++;
861 } else {
862 if (i >= content->array.raid_disks &&
863 i >= nextspare)
864 nextspare = i+1;
865 }
866 if (i < 10000) {
867 if (i >= bestcnt) {
868 int newbestcnt = i+10;
869 int *newbest = xmalloc(sizeof(int)*newbestcnt);
870 int c;
871 for (c=0; c < newbestcnt; c++)
872 if (c < bestcnt)
873 newbest[c] = best[c];
874 else
875 newbest[c] = -1;
876 if (best)free(best);
877 best = newbest;
878 bestcnt = newbestcnt;
879 }
880 if (best[i] >=0 &&
881 devices[best[i]].i.events
882 == devices[devcnt].i.events
883 && (devices[best[i]].i.disk.minor
884 != devices[devcnt].i.disk.minor)
885 && st->ss == &super0
886 && content->array.level != LEVEL_MULTIPATH) {
887 /* two different devices with identical superblock.
888 * Could be a mis-detection caused by overlapping
889 * partitions. fail-safe.
890 */
891 pr_err("WARNING %s and %s appear"
892 " to have very similar superblocks.\n"
893 " If they are really different, "
894 "please --zero the superblock on one\n"
895 " If they are the same or overlap,"
896 " please remove one from %s.\n",
897 devices[best[i]].devname, devname,
898 inargv ? "the list" :
899 "the\n DEVICE list in mdadm.conf"
900 );
901 close(mdfd);
902 free(devices);
903 free(devmap);
904 return 1;
905 }
906 if (best[i] == -1
907 || (devices[best[i]].i.events
908 < devices[devcnt].i.events))
909 best[i] = devcnt;
910 }
911 devcnt++;
912 }
913
914 if (devcnt == 0) {
915 pr_err("no devices found for %s\n",
916 mddev);
917 if (st)
918 st->ss->free_super(st);
919 close(mdfd);
920 free(devices);
921 free(devmap);
922 return 1;
923 }
924
925 if (update && strcmp(update, "byteorder")==0)
926 st->minor_version = 90;
927
928 st->ss->getinfo_super(st, content, NULL);
929 clean = content->array.state & 1;
930
931 /* now we have some devices that might be suitable.
932 * I wonder how many
933 */
934 avail = xcalloc(content->array.raid_disks, 1);
935 okcnt = 0;
936 sparecnt=0;
937 rebuilding_cnt=0;
938 for (i=0; i< bestcnt; i++) {
939 int j = best[i];
940 int event_margin = 1; /* always allow a difference of '1'
941 * like the kernel does
942 */
943 if (j < 0) continue;
944 /* note: we ignore error flags in multipath arrays
945 * as they don't make sense
946 */
947 if (content->array.level != LEVEL_MULTIPATH)
948 if (!(devices[j].i.disk.state & (1<<MD_DISK_ACTIVE))) {
949 if (!(devices[j].i.disk.state
950 & (1<<MD_DISK_FAULTY))) {
951 devices[j].uptodate = 1;
952 sparecnt++;
953 }
954 continue;
955 }
956 /* If this device thinks that 'most_recent' has failed, then
957 * we must reject this device.
958 */
959 if (j != most_recent &&
960 content->array.raid_disks > 0 &&
961 devices[most_recent].i.disk.raid_disk >= 0 &&
962 devmap[j * content->array.raid_disks + devices[most_recent].i.disk.raid_disk] == 0) {
963 if (verbose > -1)
964 pr_err("ignoring %s as it reports %s as failed\n",
965 devices[j].devname, devices[most_recent].devname);
966 best[i] = -1;
967 continue;
968 }
969 if (devices[j].i.events+event_margin >=
970 devices[most_recent].i.events) {
971 devices[j].uptodate = 1;
972 if (i < content->array.raid_disks) {
973 if (devices[j].i.recovery_start == MaxSector ||
974 (content->reshape_active &&
975 ((i >= content->array.raid_disks - content->delta_disks) ||
976 (i >= content->array.raid_disks - content->delta_disks - 1
977 && content->array.level == 4)))) {
978 okcnt++;
979 avail[i]=1;
980 } else
981 rebuilding_cnt++;
982 } else
983 sparecnt++;
984 }
985 }
986 free(devmap);
987 while (force &&
988 (!enough(content->array.level, content->array.raid_disks,
989 content->array.layout, 1,
990 avail)
991 ||
992 (content->reshape_active && content->delta_disks > 0 &&
993 !enough(content->array.level, (content->array.raid_disks
994 - content->delta_disks),
995 content->new_layout, 1,
996 avail)
997 ))) {
998 /* Choose the newest best drive which is
999 * not up-to-date, update the superblock
1000 * and add it.
1001 */
1002 int fd;
1003 struct supertype *tst;
1004 unsigned long long current_events;
1005 chosen_drive = -1;
1006 for (i = 0; i < content->array.raid_disks && i < bestcnt; i++) {
1007 int j = best[i];
1008 if (j>=0 &&
1009 !devices[j].uptodate &&
1010 devices[j].i.recovery_start == MaxSector &&
1011 (chosen_drive < 0 ||
1012 devices[j].i.events
1013 > devices[chosen_drive].i.events))
1014 chosen_drive = j;
1015 }
1016 if (chosen_drive < 0)
1017 break;
1018 current_events = devices[chosen_drive].i.events;
1019 add_another:
1020 if (verbose >= 0)
1021 pr_err("forcing event count in %s(%d) from %d upto %d\n",
1022 devices[chosen_drive].devname,
1023 devices[chosen_drive].i.disk.raid_disk,
1024 (int)(devices[chosen_drive].i.events),
1025 (int)(devices[most_recent].i.events));
1026 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
1027 if (fd < 0) {
1028 pr_err("Couldn't open %s for write - not updating\n",
1029 devices[chosen_drive].devname);
1030 devices[chosen_drive].i.events = 0;
1031 continue;
1032 }
1033 tst = dup_super(st);
1034 if (tst->ss->load_super(tst,fd, NULL)) {
1035 close(fd);
1036 pr_err("RAID superblock disappeared from %s - not updating.\n",
1037 devices[chosen_drive].devname);
1038 devices[chosen_drive].i.events = 0;
1039 continue;
1040 }
1041 content->events = devices[most_recent].i.events;
1042 tst->ss->update_super(tst, content, "force-one",
1043 devices[chosen_drive].devname, verbose,
1044 0, NULL);
1045
1046 if (tst->ss->store_super(tst, fd)) {
1047 close(fd);
1048 pr_err("Could not re-write superblock on %s\n",
1049 devices[chosen_drive].devname);
1050 devices[chosen_drive].i.events = 0;
1051 tst->ss->free_super(tst);
1052 continue;
1053 }
1054 close(fd);
1055 devices[chosen_drive].i.events = devices[most_recent].i.events;
1056 devices[chosen_drive].uptodate = 1;
1057 avail[chosen_drive] = 1;
1058 okcnt++;
1059 tst->ss->free_super(tst);
1060
1061 /* If there are any other drives of the same vintage,
1062 * add them in as well. We can't lose and we might gain
1063 */
1064 for (i = 0; i < content->array.raid_disks && i < bestcnt ; i++) {
1065 int j = best[i];
1066 if (j >= 0 &&
1067 !devices[j].uptodate &&
1068 devices[j].i.recovery_start == MaxSector &&
1069 devices[j].i.events == current_events) {
1070 chosen_drive = j;
1071 goto add_another;
1072 }
1073 }
1074 }
1075
1076 /* Now we want to look at the superblock which the kernel will base things on
1077 * and compare the devices that we think are working with the devices that the
1078 * superblock thinks are working.
1079 * If there are differences and --force is given, then update this chosen
1080 * superblock.
1081 */
1082 chosen_drive = -1;
1083 st->ss->free_super(st);
1084 for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
1085 int j = best[i];
1086 int fd;
1087
1088 if (j<0)
1089 continue;
1090 if (!devices[j].uptodate)
1091 continue;
1092 if (devices[j].i.events < devices[most_recent].i.events)
1093 continue;
1094 chosen_drive = j;
1095 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
1096 pr_err("Cannot open %s: %s\n",
1097 devices[j].devname, strerror(errno));
1098 close(mdfd);
1099 free(devices);
1100 return 1;
1101 }
1102 if (st->ss->load_super(st,fd, NULL)) {
1103 close(fd);
1104 pr_err("RAID superblock has disappeared from %s\n",
1105 devices[j].devname);
1106 close(mdfd);
1107 free(devices);
1108 return 1;
1109 }
1110 close(fd);
1111 }
1112 if (st->sb == NULL) {
1113 pr_err("No suitable drives found for %s\n", mddev);
1114 close(mdfd);
1115 free(devices);
1116 return 1;
1117 }
1118 st->ss->getinfo_super(st, content, NULL);
1119 #ifndef MDASSEMBLE
1120 sysfs_init(content, mdfd, 0);
1121 #endif
1122 for (i=0; i<bestcnt; i++) {
1123 int j = best[i];
1124 unsigned int desired_state;
1125
1126 if (i < content->array.raid_disks)
1127 desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
1128 else
1129 desired_state = 0;
1130
1131 if (j<0)
1132 continue;
1133 if (!devices[j].uptodate)
1134 continue;
1135
1136 devices[j].i.disk.state = desired_state;
1137 if (!(devices[j].i.array.state & 1))
1138 clean = 0;
1139
1140 if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
1141 verbose, 0, NULL)) {
1142 if (force) {
1143 if (verbose >= 0)
1144 pr_err("clearing FAULTY flag for device %d in %s for %s\n",
1145 j, mddev, devices[j].devname);
1146 change = 1;
1147 } else {
1148 if (verbose >= -1)
1149 pr_err("device %d in %s has wrong state in superblock, but %s seems ok\n",
1150 i, mddev, devices[j].devname);
1151 }
1152 }
1153 #if 0
1154 if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
1155 pr_err("devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
1156 i, mddev);
1157 }
1158 #endif
1159 }
1160 if (force && !clean &&
1161 !enough(content->array.level, content->array.raid_disks,
1162 content->array.layout, clean,
1163 avail)) {
1164 change += st->ss->update_super(st, content, "force-array",
1165 devices[chosen_drive].devname, verbose,
1166 0, NULL);
1167 clean = 1;
1168 }
1169
1170 if (change) {
1171 int fd;
1172 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
1173 if (fd < 0) {
1174 pr_err("Could not open %s for write - cannot Assemble array.\n",
1175 devices[chosen_drive].devname);
1176 close(mdfd);
1177 free(devices);
1178 return 1;
1179 }
1180 if (st->ss->store_super(st, fd)) {
1181 close(fd);
1182 pr_err("Could not re-write superblock on %s\n",
1183 devices[chosen_drive].devname);
1184 close(mdfd);
1185 free(devices);
1186 return 1;
1187 }
1188 if (verbose >= 0)
1189 pr_err("Marking array %s as 'clean'\n",
1190 mddev);
1191 close(fd);
1192 }
1193
1194 /* If we are in the middle of a reshape we may need to restore saved data
1195 * that was moved aside due to the reshape overwriting live data
1196 * The code of doing this lives in Grow.c
1197 */
1198 #ifndef MDASSEMBLE
1199 if (content->reshape_active) {
1200 int err = 0;
1201 int *fdlist = xmalloc(sizeof(int)* bestcnt);
1202 if (verbose > 0)
1203 pr_err(":%s has an active reshape - checking "
1204 "if critical section needs to be restored\n",
1205 chosen_name);
1206 for (i=0; i<bestcnt; i++) {
1207 int j = best[i];
1208 if (j >= 0) {
1209 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
1210 if (fdlist[i] < 0) {
1211 pr_err("Could not open %s for write - cannot Assemble array.\n",
1212 devices[j].devname);
1213 err = 1;
1214 break;
1215 }
1216 } else
1217 fdlist[i] = -1;
1218 }
1219 if (!err) {
1220 if (st->ss->external && st->ss->recover_backup)
1221 err = st->ss->recover_backup(st, content);
1222 else
1223 err = Grow_restart(st, content, fdlist, bestcnt,
1224 backup_file, verbose > 0);
1225 if (err && invalid_backup) {
1226 if (verbose > 0)
1227 pr_err("continuing"
1228 " without restoring backup\n");
1229 err = 0;
1230 }
1231 }
1232 while (i>0) {
1233 i--;
1234 if (fdlist[i]>=0) close(fdlist[i]);
1235 }
1236 if (err) {
1237 pr_err("Failed to restore critical section for reshape, sorry.\n");
1238 if (backup_file == NULL)
1239 cont_err("Possibly you needed to specify the --backup-file\n");
1240 close(mdfd);
1241 free(devices);
1242 return err;
1243 }
1244 }
1245 #endif
1246 /* count number of in-sync devices according to the superblock.
1247 * We must have this number to start the array without -s or -R
1248 */
1249 req_cnt = content->array.working_disks;
1250
1251 /* Almost ready to actually *do* something */
1252 if (!old_linux) {
1253 int rv;
1254
1255 /* First, fill in the map, so that udev can find our name
1256 * as soon as we become active.
1257 */
1258 map_update(NULL, fd2devnum(mdfd), content->text_version,
1259 content->uuid, chosen_name);
1260
1261 rv = set_array_info(mdfd, st, content);
1262 if (rv) {
1263 pr_err("failed to set array info for %s: %s\n",
1264 mddev, strerror(errno));
1265 ioctl(mdfd, STOP_ARRAY, NULL);
1266 close(mdfd);
1267 free(devices);
1268 return 1;
1269 }
1270 if (ident->bitmap_fd >= 0) {
1271 if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
1272 pr_err("SET_BITMAP_FILE failed.\n");
1273 ioctl(mdfd, STOP_ARRAY, NULL);
1274 close(mdfd);
1275 free(devices);
1276 return 1;
1277 }
1278 } else if (ident->bitmap_file) {
1279 /* From config file */
1280 int bmfd = open(ident->bitmap_file, O_RDWR);
1281 if (bmfd < 0) {
1282 pr_err("Could not open bitmap file %s\n",
1283 ident->bitmap_file);
1284 ioctl(mdfd, STOP_ARRAY, NULL);
1285 close(mdfd);
1286 free(devices);
1287 return 1;
1288 }
1289 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
1290 pr_err("Failed to set bitmapfile for %s\n", mddev);
1291 close(bmfd);
1292 ioctl(mdfd, STOP_ARRAY, NULL);
1293 close(mdfd);
1294 free(devices);
1295 return 1;
1296 }
1297 close(bmfd);
1298 }
1299
1300 /* First, add the raid disks, but add the chosen one last */
1301 for (i=0; i<= bestcnt; i++) {
1302 int j;
1303 if (i < bestcnt) {
1304 j = best[i];
1305 if (j == chosen_drive)
1306 continue;
1307 } else
1308 j = chosen_drive;
1309
1310 if (j >= 0 /* && devices[j].uptodate */) {
1311 int dfd = dev_open(devices[j].devname,
1312 O_RDWR|O_EXCL);
1313 if (dfd >= 0) {
1314 remove_partitions(dfd);
1315 close(dfd);
1316 }
1317 rv = add_disk(mdfd, st, content, &devices[j].i);
1318
1319 if (rv) {
1320 pr_err("failed to add "
1321 "%s to %s: %s\n",
1322 devices[j].devname,
1323 mddev,
1324 strerror(errno));
1325 if (i < content->array.raid_disks
1326 || i == bestcnt)
1327 okcnt--;
1328 else
1329 sparecnt--;
1330 } else if (verbose > 0)
1331 pr_err("added %s to %s as %d%s\n",
1332 devices[j].devname, mddev,
1333 devices[j].i.disk.raid_disk,
1334 devices[j].uptodate?"":
1335 " (possibly out of date)");
1336 } else if (verbose > 0 && i < content->array.raid_disks)
1337 pr_err("no uptodate device for "
1338 "slot %d of %s\n",
1339 i, mddev);
1340 }
1341
1342 if (content->array.level == LEVEL_CONTAINER) {
1343 if (verbose >= 0) {
1344 pr_err("Container %s has been "
1345 "assembled with %d drive%s",
1346 mddev, okcnt+sparecnt, okcnt+sparecnt==1?"":"s");
1347 if (okcnt < (unsigned)content->array.raid_disks)
1348 fprintf(stderr, " (out of %d)",
1349 content->array.raid_disks);
1350 fprintf(stderr, "\n");
1351 }
1352 st->ss->free_super(st);
1353 sysfs_uevent(content, "change");
1354 wait_for(chosen_name, mdfd);
1355 close(mdfd);
1356 free(devices);
1357 return 0;
1358 }
1359
1360 if (runstop == 1 ||
1361 (runstop <= 0 &&
1362 ( enough(content->array.level, content->array.raid_disks,
1363 content->array.layout, clean, avail) &&
1364 (okcnt + rebuilding_cnt >= req_cnt || start_partial_ok)
1365 ))) {
1366 /* This array is good-to-go.
1367 * If a reshape is in progress then we might need to
1368 * continue monitoring it. In that case we start
1369 * it read-only and let the grow code make it writable.
1370 */
1371 int rv;
1372 #ifndef MDASSEMBLE
1373 if (content->reshape_active &&
1374 content->delta_disks <= 0) {
1375 rv = sysfs_set_str(content, NULL,
1376 "array_state", "readonly");
1377 if (rv == 0)
1378 rv = Grow_continue(mdfd, st, content,
1379 backup_file,
1380 freeze_reshape);
1381 } else
1382 #endif
1383 rv = ioctl(mdfd, RUN_ARRAY, NULL);
1384 if (rv == 0) {
1385 if (verbose >= 0) {
1386 pr_err("%s has been started with %d drive%s",
1387 mddev, okcnt, okcnt==1?"":"s");
1388 if (okcnt < (unsigned)content->array.raid_disks)
1389 fprintf(stderr, " (out of %d)", content->array.raid_disks);
1390 if (rebuilding_cnt)
1391 fprintf(stderr, "%s %d rebuilding", sparecnt?",":" and", rebuilding_cnt);
1392 if (sparecnt)
1393 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1394 fprintf(stderr, ".\n");
1395 }
1396 if (content->reshape_active &&
1397 content->array.level >= 4 &&
1398 content->array.level <= 6) {
1399 /* might need to increase the size
1400 * of the stripe cache - default is 256
1401 */
1402 if (256 < 4 * (content->array.chunk_size/4096)) {
1403 struct mdinfo *sra = sysfs_read(mdfd, 0, 0);
1404 if (sra)
1405 sysfs_set_num(sra, NULL,
1406 "stripe_cache_size",
1407 (4 * content->array.chunk_size / 4096) + 1);
1408 sysfs_free(sra);
1409 }
1410 }
1411 if (okcnt < (unsigned)content->array.raid_disks) {
1412 /* If any devices did not get added
1413 * because the kernel rejected them based
1414 * on event count, try adding them
1415 * again providing the action policy is
1416 * 're-add' or greater. The bitmap
1417 * might allow them to be included, or
1418 * they will become spares.
1419 */
1420 for (i = 0; i < bestcnt; i++) {
1421 int j = best[i];
1422 if (j >= 0 && !devices[j].uptodate) {
1423 if (!disk_action_allows(&devices[j].i, st->ss->name, act_re_add))
1424 continue;
1425 rv = add_disk(mdfd, st, content,
1426 &devices[j].i);
1427 if (rv == 0 && verbose >= 0)
1428 pr_err("%s has been re-added.\n",
1429 devices[j].devname);
1430 }
1431 }
1432 }
1433 wait_for(mddev, mdfd);
1434 close(mdfd);
1435 if (auto_assem) {
1436 int usecs = 1;
1437 /* There is a nasty race with 'mdadm --monitor'.
1438 * If it opens this device before we close it,
1439 * it gets an incomplete open on which IO
1440 * doesn't work and the capacity is
1441 * wrong.
1442 * If we reopen (to check for layered devices)
1443 * before --monitor closes, we loose.
1444 *
1445 * So: wait upto 1 second for there to be
1446 * a non-zero capacity.
1447 */
1448 while (usecs < 1000) {
1449 mdfd = open(mddev, O_RDONLY);
1450 if (mdfd >= 0) {
1451 unsigned long long size;
1452 if (get_dev_size(mdfd, NULL, &size) &&
1453 size > 0)
1454 break;
1455 close(mdfd);
1456 }
1457 usleep(usecs);
1458 usecs <<= 1;
1459 }
1460 }
1461 free(devices);
1462 return 0;
1463 }
1464 pr_err("failed to RUN_ARRAY %s: %s\n",
1465 mddev, strerror(errno));
1466
1467 if (!enough(content->array.level, content->array.raid_disks,
1468 content->array.layout, 1, avail))
1469 pr_err("Not enough devices to "
1470 "start the array.\n");
1471 else if (!enough(content->array.level,
1472 content->array.raid_disks,
1473 content->array.layout, clean,
1474 avail))
1475 pr_err("Not enough devices to "
1476 "start the array while not clean "
1477 "- consider --force.\n");
1478
1479 if (auto_assem)
1480 ioctl(mdfd, STOP_ARRAY, NULL);
1481 close(mdfd);
1482 free(devices);
1483 return 1;
1484 }
1485 if (runstop == -1) {
1486 pr_err("%s assembled from %d drive%s",
1487 mddev, okcnt, okcnt==1?"":"s");
1488 if (okcnt != (unsigned)content->array.raid_disks)
1489 fprintf(stderr, " (out of %d)", content->array.raid_disks);
1490 fprintf(stderr, ", but not started.\n");
1491 close(mdfd);
1492 free(devices);
1493 return 0;
1494 }
1495 if (verbose >= -1) {
1496 pr_err("%s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
1497 if (rebuilding_cnt)
1498 fprintf(stderr, "%s %d rebuilding", sparecnt?", ":" and ", rebuilding_cnt);
1499 if (sparecnt)
1500 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1501 if (!enough(content->array.level, content->array.raid_disks,
1502 content->array.layout, 1, avail))
1503 fprintf(stderr, " - not enough to start the array.\n");
1504 else if (!enough(content->array.level,
1505 content->array.raid_disks,
1506 content->array.layout, clean,
1507 avail))
1508 fprintf(stderr, " - not enough to start the "
1509 "array while not clean - consider "
1510 "--force.\n");
1511 else {
1512 if (req_cnt == (unsigned)content->array.raid_disks)
1513 fprintf(stderr, " - need all %d to start it", req_cnt);
1514 else
1515 fprintf(stderr, " - need %d of %d to start", req_cnt, content->array.raid_disks);
1516 fprintf(stderr, " (use --run to insist).\n");
1517 }
1518 }
1519 if (auto_assem)
1520 ioctl(mdfd, STOP_ARRAY, NULL);
1521 close(mdfd);
1522 free(devices);
1523 return 1;
1524 } else {
1525 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1526 * been updated to point to the current locations of devices.
1527 * so we can just start the array
1528 */
1529 unsigned long dev;
1530 dev = makedev(devices[chosen_drive].i.disk.major,
1531 devices[chosen_drive].i.disk.minor);
1532 if (ioctl(mdfd, START_ARRAY, dev)) {
1533 pr_err("Cannot start array: %s\n",
1534 strerror(errno));
1535 }
1536
1537 }
1538 close(mdfd);
1539 free(devices);
1540 return 0;
1541 }
1542
1543 #ifndef MDASSEMBLE
1544 int assemble_container_content(struct supertype *st, int mdfd,
1545 struct mdinfo *content, int runstop,
1546 char *chosen_name, int verbose,
1547 char *backup_file, int freeze_reshape)
1548 {
1549 struct mdinfo *dev, *sra;
1550 int working = 0, preexist = 0;
1551 int expansion = 0;
1552 struct map_ent *map = NULL;
1553 int old_raid_disks;
1554 int start_reshape;
1555
1556 sysfs_init(content, mdfd, 0);
1557
1558 sra = sysfs_read(mdfd, 0, GET_VERSION);
1559 if (sra == NULL || strcmp(sra->text_version, content->text_version) != 0)
1560 if (sysfs_set_array(content, md_get_version(mdfd)) != 0) {
1561 if (sra)
1562 sysfs_free(sra);
1563 return 1;
1564 }
1565
1566 /* There are two types of reshape: container wide or sub-array specific
1567 * Check if metadata requests blocking container wide reshapes
1568 */
1569 start_reshape = (content->reshape_active &&
1570 !((content->reshape_active == CONTAINER_RESHAPE) &&
1571 (content->array.state & (1<<MD_SB_BLOCK_CONTAINER_RESHAPE))));
1572
1573 /* Block subarray here if it is under reshape now
1574 * Do not allow for any changes in this array
1575 */
1576 if (st->ss->external && content->recovery_blocked && start_reshape)
1577 block_subarray(content);
1578
1579 if (sra)
1580 sysfs_free(sra);
1581 old_raid_disks = content->array.raid_disks - content->delta_disks;
1582 for (dev = content->devs; dev; dev = dev->next)
1583 if (sysfs_add_disk(content, dev, 1) == 0) {
1584 if (dev->disk.raid_disk >= old_raid_disks &&
1585 content->reshape_active)
1586 expansion++;
1587 else
1588 working++;
1589 } else if (errno == EEXIST)
1590 preexist++;
1591 if (working + expansion == 0)
1592 return 1;/* Nothing new, don't try to start */
1593
1594 map_update(&map, fd2devnum(mdfd),
1595 content->text_version,
1596 content->uuid, chosen_name);
1597
1598 if (runstop > 0 ||
1599 (working + preexist + expansion) >=
1600 content->array.working_disks) {
1601 int err;
1602
1603 if (start_reshape) {
1604 int spare = content->array.raid_disks + expansion;
1605 if (restore_backup(st, content,
1606 working,
1607 spare, backup_file, verbose) == 1)
1608 return 1;
1609
1610 err = sysfs_set_str(content, NULL,
1611 "array_state", "readonly");
1612 if (err)
1613 return 1;
1614
1615 if (st->ss->external) {
1616 if (!mdmon_running(st->container_dev))
1617 start_mdmon(st->container_dev);
1618 ping_monitor_by_id(st->container_dev);
1619 if (mdmon_running(st->container_dev) &&
1620 st->update_tail == NULL)
1621 st->update_tail = &st->updates;
1622 }
1623
1624 err = Grow_continue(mdfd, st, content, backup_file,
1625 freeze_reshape);
1626 } else switch(content->array.level) {
1627 case LEVEL_LINEAR:
1628 case LEVEL_MULTIPATH:
1629 case 0:
1630 err = sysfs_set_str(content, NULL, "array_state",
1631 "active");
1632 break;
1633 default:
1634 err = sysfs_set_str(content, NULL, "array_state",
1635 "readonly");
1636 /* start mdmon if needed. */
1637 if (!err) {
1638 if (!mdmon_running(st->container_dev))
1639 start_mdmon(st->container_dev);
1640 ping_monitor_by_id(st->container_dev);
1641 }
1642 break;
1643 }
1644 if (!err)
1645 sysfs_set_safemode(content, content->safe_mode_delay);
1646
1647 /* Block subarray here if it is not reshaped now
1648 * It has be blocked a little later to allow mdmon to switch in
1649 * in to R/W state
1650 */
1651 if (st->ss->external && content->recovery_blocked &&
1652 !start_reshape)
1653 block_subarray(content);
1654
1655 if (verbose >= 0) {
1656 if (err)
1657 pr_err("array %s now has %d device%s",
1658 chosen_name, working + preexist,
1659 working + preexist == 1 ? "":"s");
1660 else
1661 pr_err("Started %s with %d device%s",
1662 chosen_name, working + preexist,
1663 working + preexist == 1 ? "":"s");
1664 if (preexist)
1665 fprintf(stderr, " (%d new)", working);
1666 if (expansion)
1667 fprintf(stderr, " ( + %d for expansion)",
1668 expansion);
1669 fprintf(stderr, "\n");
1670 }
1671 if (!err)
1672 wait_for(chosen_name, mdfd);
1673 return err;
1674 /* FIXME should have an O_EXCL and wait for read-auto */
1675 } else {
1676 if (verbose >= 0) {
1677 pr_err("%s assembled with %d device%s",
1678 chosen_name, preexist + working,
1679 preexist + working == 1 ? "":"s");
1680 if (preexist)
1681 fprintf(stderr, " (%d new)", working);
1682 fprintf(stderr, " but not started\n");
1683 }
1684 return 1;
1685 }
1686 }
1687 #endif
1688
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