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1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 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@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30 #include "mdadm.h"
31 #include <ctype.h>
32
33 static int name_matches(char *found, char *required, char *homehost)
34 {
35 /* See if the name found matches the required name, possibly
36 * prefixed with 'homehost'
37 */
38 char fnd[33];
39
40 strncpy(fnd, found, 32);
41 fnd[32] = 0;
42 if (strcmp(found, required)==0)
43 return 1;
44 if (homehost) {
45 int l = strlen(homehost);
46 if (l < 32 && fnd[l] == ':' &&
47 strcmp(fnd+l+1, required)==0)
48 return 1;
49 }
50 return 0;
51 }
52
53 int Assemble(struct supertype *st, char *mddev, int mdfd,
54 mddev_ident_t ident,
55 mddev_dev_t devlist, char *backup_file,
56 int readonly, int runstop,
57 char *update, char *homehost,
58 int verbose, int force)
59 {
60 /*
61 * The task of Assemble is to find a collection of
62 * devices that should (according to their superblocks)
63 * form an array, and to give this collection to the MD driver.
64 * In Linux-2.4 and later, this involves submitting a
65 * SET_ARRAY_INFO ioctl with no arg - to prepare
66 * the array - and then submit a number of
67 * ADD_NEW_DISK ioctls to add disks into
68 * the array. Finally RUN_ARRAY might
69 * be submitted to start the array.
70 *
71 * Much of the work of Assemble is in finding and/or
72 * checking the disks to make sure they look right.
73 *
74 * If mddev is not set, then scan must be set and we
75 * read through the config file for dev+uuid mapping
76 * We recurse, setting mddev, for each device that
77 * - isn't running
78 * - has a valid uuid (or any uuid if !uuidset)
79 *
80 * If mddev is set, we try to determine state of md.
81 * check version - must be at least 0.90.0
82 * check kernel version. must be at least 2.4.
83 * If not, we can possibly fall back on START_ARRAY
84 * Try to GET_ARRAY_INFO.
85 * If possible, give up
86 * If not, try to STOP_ARRAY just to make sure
87 *
88 * If !uuidset and scan, look in conf-file for uuid
89 * If not found, give up
90 * If !devlist and scan and uuidset, get list of devs from conf-file
91 *
92 * For each device:
93 * Check superblock - discard if bad
94 * Check uuid (set if we don't have one) - discard if no match
95 * Check superblock similarity if we have a superblock - discard if different
96 * Record events, devicenum
97 * This should give us a list of devices for the array
98 * We should collect the most recent event number
99 *
100 * Count disks with recent enough event count
101 * While force && !enough disks
102 * Choose newest rejected disks, update event count
103 * mark clean and rewrite superblock
104 * If recent kernel:
105 * SET_ARRAY_INFO
106 * foreach device with recent events : ADD_NEW_DISK
107 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
108 * If old kernel:
109 * Check the device numbers in superblock are right
110 * update superblock if any changes
111 * START_ARRAY
112 *
113 */
114 int must_close = 0;
115 int old_linux = 0;
116 int vers = 0; /* Keep gcc quite - it really is initialised */
117 void *first_super = NULL, *super = NULL;
118 struct {
119 char *devname;
120 unsigned int major, minor;
121 unsigned int oldmajor, oldminor;
122 long long events;
123 int uptodate;
124 int state;
125 int raid_disk;
126 int disk_nr;
127 } *devices;
128 int *best = NULL; /* indexed by raid_disk */
129 unsigned int bestcnt = 0;
130 int devcnt = 0;
131 unsigned int okcnt, sparecnt;
132 unsigned int req_cnt;
133 unsigned int i;
134 int most_recent = 0;
135 int chosen_drive;
136 int change = 0;
137 int inargv = 0;
138 int start_partial_ok = (runstop >= 0) && (force || devlist==NULL || mdfd < 0);
139 unsigned int num_devs;
140 mddev_dev_t tmpdev;
141 struct mdinfo info;
142 char *avail;
143 int nextspare = 0;
144
145 if (get_linux_version() < 2004000)
146 old_linux = 1;
147
148 if (mdfd >= 0) {
149 vers = md_get_version(mdfd);
150 if (vers <= 0) {
151 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
152 return 1;
153 }
154 if (vers < 9000) {
155 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
156 " Upgrade your kernel or try --build\n");
157 return 1;
158 }
159
160 if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
161 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
162 mddev);
163 return 1;
164 }
165 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
166 }
167 /*
168 * If any subdevs are listed, then any that don't
169 * match ident are discarded. Remainder must all match and
170 * become the array.
171 * If no subdevs, then we scan all devices in the config file, but
172 * there must be something in the identity
173 */
174
175 if (!devlist &&
176 ident->uuid_set == 0 &&
177 ident->super_minor < 0 &&
178 ident->devices == NULL) {
179 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
180 mddev ? mddev : "further assembly");
181 return 1;
182 }
183 if (devlist == NULL)
184 devlist = conf_get_devs();
185 else if (mdfd >= 0)
186 inargv = 1;
187
188 try_again:
189
190 tmpdev = devlist; num_devs = 0;
191 while (tmpdev) {
192 if (tmpdev->used)
193 tmpdev->used = 2;
194 else
195 num_devs++;
196 tmpdev = tmpdev->next;
197 }
198 devices = malloc(num_devs * sizeof(*devices));
199
200 if (!st && ident->st) st = ident->st;
201
202 if (verbose>0)
203 fprintf(stderr, Name ": looking for devices for %s\n",
204 mddev ? mddev : "further assembly");
205
206 /* first walk the list of devices to find a consistent set
207 * that match the criterea, if that is possible.
208 * We flag the one we like with 'used'.
209 */
210 for (tmpdev = devlist;
211 tmpdev;
212 tmpdev = tmpdev->next) {
213 char *devname = tmpdev->devname;
214 int dfd;
215 struct stat stb;
216 struct supertype *tst = st;
217
218 if (tmpdev->used > 1) continue;
219
220 if (ident->devices &&
221 !match_oneof(ident->devices, devname)) {
222 if ((inargv && verbose>=0) || verbose > 0)
223 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
224 continue;
225 }
226
227 if (super) {
228 free(super);
229 super = NULL;
230 }
231
232 dfd = dev_open(devname, O_RDONLY|O_EXCL);
233 if (dfd < 0) {
234 if ((inargv && verbose >= 0) || verbose > 0)
235 fprintf(stderr, Name ": cannot open device %s: %s\n",
236 devname, strerror(errno));
237 tmpdev->used = 2;
238 } else if (fstat(dfd, &stb)< 0) {
239 /* Impossible! */
240 fprintf(stderr, Name ": fstat failed for %s: %s\n",
241 devname, strerror(errno));
242 tmpdev->used = 2;
243 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
244 fprintf(stderr, Name ": %s is not a block device.\n",
245 devname);
246 tmpdev->used = 2;
247 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
248 if ((inargv && verbose >= 0) || verbose > 0)
249 fprintf(stderr, Name ": no recogniseable superblock on %s\n",
250 devname);
251 tmpdev->used = 2;
252 } else if (tst->ss->load_super(tst,dfd, &super, NULL)) {
253 if ((inargv && verbose >= 0) || verbose > 0)
254 fprintf( stderr, Name ": no RAID superblock on %s\n",
255 devname);
256 } else {
257 tst->ss->getinfo_super(&info, super);
258 }
259 if (dfd >= 0) close(dfd);
260
261 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
262 (!super || same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
263 if ((inargv && verbose >= 0) || verbose > 0)
264 fprintf(stderr, Name ": %s has wrong uuid.\n",
265 devname);
266 continue;
267 }
268 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
269 (!super || name_matches(info.name, ident->name, homehost)==0)) {
270 if ((inargv && verbose >= 0) || verbose > 0)
271 fprintf(stderr, Name ": %s has wrong name.\n",
272 devname);
273 continue;
274 }
275 if (ident->super_minor != UnSet &&
276 (!super || ident->super_minor != info.array.md_minor)) {
277 if ((inargv && verbose >= 0) || verbose > 0)
278 fprintf(stderr, Name ": %s has wrong super-minor.\n",
279 devname);
280 continue;
281 }
282 if (ident->level != UnSet &&
283 (!super|| ident->level != info.array.level)) {
284 if ((inargv && verbose >= 0) || verbose > 0)
285 fprintf(stderr, Name ": %s has wrong raid level.\n",
286 devname);
287 continue;
288 }
289 if (ident->raid_disks != UnSet &&
290 (!super || ident->raid_disks!= info.array.raid_disks)) {
291 if ((inargv && verbose >= 0) || verbose > 0)
292 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
293 devname);
294 continue;
295 }
296 if (mdfd < 0) {
297 if (tst == NULL || super == NULL)
298 continue;
299 if (update == NULL &&
300 tst->ss->match_home(super, homehost)==0) {
301 if ((inargv && verbose >= 0) || verbose > 0)
302 fprintf(stderr, Name ": %s is not built for host %s.\n",
303 devname, homehost);
304 /* Auto-assemble, and this is not a usable host */
305 /* if update != NULL, we are updating the host
306 * name... */
307 continue;
308 }
309 }
310 /* If we are this far, then we are nearly commited to this device.
311 * If the super_block doesn't exist, or doesn't match others,
312 * then we probably cannot continue
313 * However if one of the arrays is for the homehost, and
314 * the other isn't that can disambiguate.
315 */
316
317 if (!super) {
318 fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
319 devname);
320 free(first_super);
321 return 1;
322 }
323
324 if (st == NULL)
325 st = tst;
326 if (st->ss != tst->ss ||
327 st->minor_version != tst->minor_version ||
328 st->ss->compare_super(&first_super, super) != 0) {
329 /* Some mismatch. If exactly one array matches this host,
330 * we can resolve on that one.
331 * Or, if we are auto assembling, we just ignore the second
332 * for now.
333 */
334 if (mdfd < 0)
335 continue;
336 if (homehost) {
337 int first = st->ss->match_home(first_super, homehost);
338 int last = tst->ss->match_home(super, homehost);
339 if (first+last == 1) {
340 /* We can do something */
341 if (first) {/* just ignore this one */
342 if ((inargv && verbose >= 0) || verbose > 0)
343 fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
344 devname);
345 continue;
346 } else { /* reject all those sofar */
347 mddev_dev_t td;
348 if ((inargv && verbose >= 0) || verbose > 0)
349 fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n",
350 devname);
351 for (td=devlist; td != tmpdev; td=td->next)
352 if (td->used == 1)
353 td->used = 0;
354 tmpdev->used = 1;
355 continue;
356 }
357 }
358 }
359 fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
360 devname);
361 free(super);
362 free(first_super);
363 return 1;
364 }
365
366 tmpdev->used = 1;
367 }
368
369 if (mdfd < 0) {
370 /* So... it is up to me to open the device.
371 * We create a name '/dev/md/XXX' based on the info in the
372 * superblock, and call open_mddev on that
373 */
374 mdu_array_info_t inf;
375 char *c;
376 if (!first_super) {
377 return 2;
378 }
379 st->ss->getinfo_super(&info, first_super);
380 c = strchr(info.name, ':');
381 if (c) c++; else c= info.name;
382 if (isdigit(*c) && ((ident->autof & 7)==4 || (ident->autof&7)==6))
383 /* /dev/md/d0 style for partitionable */
384 asprintf(&mddev, "/dev/md/d%s", c);
385 else
386 asprintf(&mddev, "/dev/md/%s", c);
387 mdfd = open_mddev(mddev, ident->autof);
388 if (mdfd < 0) {
389 free(first_super);
390 free(devices);
391 first_super = NULL;
392 goto try_again;
393 }
394 vers = md_get_version(mdfd);
395 if (ioctl(mdfd, GET_ARRAY_INFO, &inf)==0) {
396 for (tmpdev = devlist ;
397 tmpdev && tmpdev->used != 1;
398 tmpdev = tmpdev->next)
399 ;
400 fprintf(stderr, Name ": %s already active, cannot restart it!\n", mddev);
401 if (tmpdev)
402 fprintf(stderr, Name ": %s needed for %s...\n",
403 mddev, tmpdev->devname);
404 close(mdfd);
405 mdfd = -1;
406 free(first_super);
407 free(devices);
408 first_super = NULL;
409 goto try_again;
410 }
411 must_close = 1;
412 }
413
414 /* Ok, no bad inconsistancy, we can try updating etc */
415 for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
416 char *devname = tmpdev->devname;
417 struct stat stb;
418 /* looks like a good enough match to update the super block if needed */
419 #ifndef MDASSEMBLE
420 if (update) {
421 int dfd;
422 /* prepare useful information in info structures */
423 struct stat stb2;
424 fstat(mdfd, &stb2);
425
426 if (strcmp(update, "uuid")==0 &&
427 !ident->uuid_set) {
428 int rfd;
429 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
430 read(rfd, ident->uuid, 16) != 16) {
431 *(__u32*)(ident->uuid) = random();
432 *(__u32*)(ident->uuid+1) = random();
433 *(__u32*)(ident->uuid+2) = random();
434 *(__u32*)(ident->uuid+3) = random();
435 }
436 if (rfd >= 0) close(rfd);
437 }
438 dfd = dev_open(devname, O_RDWR|O_EXCL);
439
440 remove_partitions(dfd);
441
442 if (super) {
443 free(super);
444 super = NULL;
445 }
446
447 st->ss->load_super(st, dfd, &super, NULL);
448 st->ss->getinfo_super(&info, super);
449
450 memcpy(info.uuid, ident->uuid, 16);
451 strcpy(info.name, ident->name);
452 info.array.md_minor = minor(stb2.st_rdev);
453
454 st->ss->update_super(&info, super, update, devname, verbose,
455 ident->uuid_set, homehost);
456 if (strcmp(update, "uuid")==0 &&
457 !ident->uuid_set) {
458 ident->uuid_set = 1;
459 memcpy(ident->uuid, info.uuid, 16);
460 }
461 if (dfd < 0)
462 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
463 devname);
464 else if (st->ss->store_super(st, dfd, super))
465 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
466 devname);
467 if (dfd >= 0)
468 close(dfd);
469
470 if (strcmp(update, "uuid")==0 &&
471 ident->bitmap_fd)
472 if (bitmap_update_uuid(ident->bitmap_fd, info.uuid) != 0)
473 fprintf(stderr, Name ": Could not update uuid on %s.\n",
474 devname);
475 } else
476 #endif
477 {
478 int dfd;
479 dfd = dev_open(devname, O_RDWR|O_EXCL);
480
481 remove_partitions(dfd);
482
483 if (super) {
484 free(super);
485 super = NULL;
486 }
487
488 st->ss->load_super(st, dfd, &super, NULL);
489 st->ss->getinfo_super(&info, super);
490 close(dfd);
491 }
492
493 stat(devname, &stb);
494
495 if (verbose > 0)
496 fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
497 devname, mddev, info.disk.raid_disk);
498 devices[devcnt].devname = devname;
499 devices[devcnt].major = major(stb.st_rdev);
500 devices[devcnt].minor = minor(stb.st_rdev);
501 devices[devcnt].oldmajor = info.disk.major;
502 devices[devcnt].oldminor = info.disk.minor;
503 devices[devcnt].events = info.events;
504 devices[devcnt].raid_disk = info.disk.raid_disk;
505 devices[devcnt].disk_nr = info.disk.number;
506 devices[devcnt].uptodate = 0;
507 devices[devcnt].state = info.disk.state;
508 if (most_recent < devcnt) {
509 if (devices[devcnt].events
510 > devices[most_recent].events)
511 most_recent = devcnt;
512 }
513 if (info.array.level == -4)
514 /* with multipath, the raid_disk from the superblock is meaningless */
515 i = devcnt;
516 else
517 i = devices[devcnt].raid_disk;
518 if (i+1 == 0) {
519 if (nextspare < info.array.raid_disks)
520 nextspare = info.array.raid_disks;
521 i = nextspare++;
522 } else {
523 if (i >= info.array.raid_disks &&
524 i >= nextspare)
525 nextspare = i+1;
526 }
527 if (i < 10000) {
528 if (i >= bestcnt) {
529 unsigned int newbestcnt = i+10;
530 int *newbest = malloc(sizeof(int)*newbestcnt);
531 unsigned int c;
532 for (c=0; c < newbestcnt; c++)
533 if (c < bestcnt)
534 newbest[c] = best[c];
535 else
536 newbest[c] = -1;
537 if (best)free(best);
538 best = newbest;
539 bestcnt = newbestcnt;
540 }
541 if (best[i] >=0 &&
542 devices[best[i]].events == devices[devcnt].events &&
543 devices[best[i]].minor != devices[devcnt].minor &&
544 st->ss->major == 0 &&
545 info.array.level != -4) {
546 /* two different devices with identical superblock.
547 * Could be a mis-detection caused by overlapping
548 * partitions. fail-safe.
549 */
550 fprintf(stderr, Name ": WARNING %s and %s appear"
551 " to have very similar superblocks.\n"
552 " If they are really different, "
553 "please --zero the superblock on one\n"
554 " If they are the same or overlap,"
555 " please remove one from %s.\n",
556 devices[best[i]].devname, devname,
557 inargv ? "the list" :
558 "the\n DEVICE list in mdadm.conf"
559 );
560 if (must_close) close(mdfd);
561 return 1;
562 }
563 if (best[i] == -1
564 || devices[best[i]].events < devices[devcnt].events)
565 best[i] = devcnt;
566 }
567 devcnt++;
568 }
569
570 if (super)
571 free(super);
572 super = NULL;
573
574 if (update && strcmp(update, "byteorder")==0)
575 st->minor_version = 90;
576
577 if (devcnt == 0) {
578 fprintf(stderr, Name ": no devices found for %s\n",
579 mddev);
580 free(first_super);
581 if (must_close) close(mdfd);
582 return 1;
583 }
584
585 st->ss->getinfo_super(&info, first_super);
586
587 /* now we have some devices that might be suitable.
588 * I wonder how many
589 */
590 avail = malloc(info.array.raid_disks);
591 memset(avail, 0, info.array.raid_disks);
592 okcnt = 0;
593 sparecnt=0;
594 for (i=0; i< bestcnt ;i++) {
595 int j = best[i];
596 int event_margin = 1; /* always allow a difference of '1'
597 * like the kernel does
598 */
599 if (j < 0) continue;
600 /* note: we ignore error flags in multipath arrays
601 * as they don't make sense
602 */
603 if (info.array.level != -4)
604 if (!(devices[j].state & (1<<MD_DISK_SYNC))) {
605 if (!(devices[j].state & (1<<MD_DISK_FAULTY)))
606 sparecnt++;
607 continue;
608 }
609 if (devices[j].events+event_margin >=
610 devices[most_recent].events) {
611 devices[j].uptodate = 1;
612 if (i < info.array.raid_disks) {
613 okcnt++;
614 avail[i]=1;
615 } else
616 sparecnt++;
617 }
618 }
619 while (force && !enough(info.array.level, info.array.raid_disks,
620 info.array.layout,
621 avail, okcnt)) {
622 /* Choose the newest best drive which is
623 * not up-to-date, update the superblock
624 * and add it.
625 */
626 int fd;
627 chosen_drive = -1;
628 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
629 int j = best[i];
630 if (j>=0 &&
631 !devices[j].uptodate &&
632 devices[j].events > 0 &&
633 (chosen_drive < 0 ||
634 devices[j].events > devices[chosen_drive].events))
635 chosen_drive = j;
636 }
637 if (chosen_drive < 0)
638 break;
639 if (verbose >= 0)
640 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
641 devices[chosen_drive].devname, devices[chosen_drive].raid_disk,
642 (int)(devices[chosen_drive].events),
643 (int)(devices[most_recent].events));
644 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
645 if (fd < 0) {
646 fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
647 devices[chosen_drive].devname);
648 devices[chosen_drive].events = 0;
649 continue;
650 }
651 if (st->ss->load_super(st,fd, &super, NULL)) {
652 close(fd);
653 fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
654 devices[chosen_drive].devname);
655 devices[chosen_drive].events = 0;
656 continue;
657 }
658 info.events = devices[most_recent].events;
659 st->ss->update_super(&info, super, "force-one",
660 devices[chosen_drive].devname, verbose,
661 0, NULL);
662
663 if (st->ss->store_super(st, fd, super)) {
664 close(fd);
665 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
666 devices[chosen_drive].devname);
667 devices[chosen_drive].events = 0;
668 free(super);
669 continue;
670 }
671 close(fd);
672 devices[chosen_drive].events = devices[most_recent].events;
673 devices[chosen_drive].uptodate = 1;
674 avail[chosen_drive] = 1;
675 okcnt++;
676 free(super);
677 }
678
679 /* Now we want to look at the superblock which the kernel will base things on
680 * and compare the devices that we think are working with the devices that the
681 * superblock thinks are working.
682 * If there are differences and --force is given, then update this chosen
683 * superblock.
684 */
685 chosen_drive = -1;
686 super = NULL;
687 for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
688 int j = best[i];
689 int fd;
690
691 if (j<0)
692 continue;
693 if (!devices[j].uptodate)
694 continue;
695 chosen_drive = j;
696 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
697 fprintf(stderr, Name ": Cannot open %s: %s\n",
698 devices[j].devname, strerror(errno));
699 if (must_close) close(mdfd);
700 return 1;
701 }
702 if (st->ss->load_super(st,fd, &super, NULL)) {
703 close(fd);
704 fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
705 devices[j].devname);
706 if (must_close) close(mdfd);
707 return 1;
708 }
709 close(fd);
710 }
711 if (super == NULL) {
712 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
713 if (must_close) close(mdfd);
714 return 1;
715 }
716 st->ss->getinfo_super(&info, super);
717 for (i=0; i<bestcnt; i++) {
718 int j = best[i];
719 unsigned int desired_state;
720
721 if (i < info.array.raid_disks)
722 desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
723 else
724 desired_state = 0;
725
726 if (j<0)
727 continue;
728 if (!devices[j].uptodate)
729 continue;
730 info.disk.number = devices[j].disk_nr;
731 info.disk.raid_disk = i;
732 info.disk.state = desired_state;
733
734 if (devices[j].uptodate &&
735 st->ss->update_super(&info, super, "assemble", NULL, verbose, 0, NULL)) {
736 if (force) {
737 if (verbose >= 0)
738 fprintf(stderr, Name ": "
739 "clearing FAULTY flag for device %d in %s for %s\n",
740 j, mddev, devices[j].devname);
741 change = 1;
742 } else {
743 if (verbose >= -1)
744 fprintf(stderr, Name ": "
745 "device %d in %s has wrong state in superblock, but %s seems ok\n",
746 i, mddev, devices[j].devname);
747 }
748 }
749 #if 0
750 if (!devices[j].uptodate &&
751 !(super.disks[i].state & (1 << MD_DISK_FAULTY))) {
752 fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
753 i, mddev);
754 }
755 #endif
756 }
757 if (force && okcnt < info.array.raid_disks) {
758 change += st->ss->update_super(&info, super, "force-array",
759 devices[chosen_drive].devname, verbose,
760 0, NULL);
761 }
762
763 if (change) {
764 int fd;
765 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
766 if (fd < 0) {
767 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
768 devices[chosen_drive].devname);
769 if (must_close) close(mdfd);
770 return 1;
771 }
772 if (st->ss->store_super(st, fd, super)) {
773 close(fd);
774 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
775 devices[chosen_drive].devname);
776 if (must_close) close(mdfd);
777 return 1;
778 }
779 close(fd);
780 }
781
782 /* If we are in the middle of a reshape we may need to restore saved data
783 * that was moved aside due to the reshape overwriting live data
784 * The code of doing this lives in Grow.c
785 */
786 #ifndef MDASSEMBLE
787 if (info.reshape_active) {
788 int err = 0;
789 int *fdlist = malloc(sizeof(int)* bestcnt);
790 for (i=0; i<bestcnt; i++) {
791 int j = best[i];
792 if (j >= 0) {
793 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
794 if (fdlist[i] < 0) {
795 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
796 devices[j].devname);
797 err = 1;
798 break;
799 }
800 } else
801 fdlist[i] = -1;
802 }
803 if (!err)
804 err = Grow_restart(st, &info, fdlist, bestcnt, backup_file);
805 while (i>0) {
806 i--;
807 if (fdlist[i]>=0) close(fdlist[i]);
808 }
809 if (err) {
810 fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
811 if (must_close) close(mdfd);
812 return err;
813 }
814 }
815 #endif
816 /* count number of in-sync devices according to the superblock.
817 * We must have this number to start the array without -s or -R
818 */
819 req_cnt = info.array.working_disks;
820
821 /* Almost ready to actually *do* something */
822 if (!old_linux) {
823 int rv;
824 if ((vers % 100) >= 1) { /* can use different versions */
825 mdu_array_info_t inf;
826 memset(&inf, 0, sizeof(inf));
827 inf.major_version = st->ss->major;
828 inf.minor_version = st->minor_version;
829 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
830 } else
831 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
832
833 if (rv) {
834 fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
835 mddev, strerror(errno));
836 if (must_close) close(mdfd);
837 return 1;
838 }
839 if (ident->bitmap_fd >= 0) {
840 if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
841 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
842 if (must_close) close(mdfd);
843 return 1;
844 }
845 } else if (ident->bitmap_file) {
846 /* From config file */
847 int bmfd = open(ident->bitmap_file, O_RDWR);
848 if (bmfd < 0) {
849 fprintf(stderr, Name ": Could not open bitmap file %s\n",
850 ident->bitmap_file);
851 if (must_close) close(mdfd);
852 return 1;
853 }
854 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
855 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
856 close(bmfd);
857 if (must_close) close(mdfd);
858 return 1;
859 }
860 close(bmfd);
861 }
862
863 /* First, add the raid disks, but add the chosen one last */
864 for (i=0; i<= bestcnt; i++) {
865 int j;
866 if (i < bestcnt) {
867 j = best[i];
868 if (j == chosen_drive)
869 continue;
870 } else
871 j = chosen_drive;
872
873 if (j >= 0 /* && devices[j].uptodate */) {
874 mdu_disk_info_t disk;
875 memset(&disk, 0, sizeof(disk));
876 disk.major = devices[j].major;
877 disk.minor = devices[j].minor;
878 if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) {
879 fprintf(stderr, Name ": failed to add %s to %s: %s\n",
880 devices[j].devname,
881 mddev,
882 strerror(errno));
883 if (i < info.array.raid_disks || i == bestcnt)
884 okcnt--;
885 else
886 sparecnt--;
887 } else if (verbose > 0)
888 fprintf(stderr, Name ": added %s to %s as %d\n",
889 devices[j].devname, mddev, devices[j].raid_disk);
890 } else if (verbose > 0 && i < info.array.raid_disks)
891 fprintf(stderr, Name ": no uptodate device for slot %d of %s\n",
892 i, mddev);
893 }
894
895 if (runstop == 1 ||
896 (runstop <= 0 &&
897 ( enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt) &&
898 (okcnt >= req_cnt || start_partial_ok)
899 ))) {
900 if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
901 if (verbose >= 0) {
902 fprintf(stderr, Name ": %s has been started with %d drive%s",
903 mddev, okcnt, okcnt==1?"":"s");
904 if (okcnt < info.array.raid_disks)
905 fprintf(stderr, " (out of %d)", info.array.raid_disks);
906 if (sparecnt)
907 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
908 fprintf(stderr, ".\n");
909 }
910 if (must_close) {
911 int usecs = 1;
912 close(mdfd);
913 /* There is a nasty race with 'mdadm --monitor'.
914 * If it opens this device before we close it,
915 * it gets an incomplete open on which IO
916 * doesn't work and the capacity if wrong.
917 * If we reopen (to check for layered devices)
918 * before --monitor closes, we loose.
919 *
920 * So: wait upto 1 second for there to be
921 * a non-zero capacity.
922 */
923 while (usecs < 1000) {
924 mdfd = open(mddev, O_RDONLY);
925 if (mdfd >= 0) {
926 unsigned long size;
927 if (ioctl(mdfd, BLKGETSIZE, &size) == 0 &&
928 size > 0)
929 break;
930 close(mdfd);
931 }
932 usleep(usecs);
933 usecs <<= 1;
934 }
935 }
936 return 0;
937 }
938 fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
939 mddev, strerror(errno));
940 if (must_close) close(mdfd);
941 return 1;
942 }
943 if (runstop == -1) {
944 fprintf(stderr, Name ": %s assembled from %d drive%s",
945 mddev, okcnt, okcnt==1?"":"s");
946 if (okcnt != info.array.raid_disks)
947 fprintf(stderr, " (out of %d)", info.array.raid_disks);
948 fprintf(stderr, ", but not started.\n");
949 if (must_close) close(mdfd);
950 return 0;
951 }
952 if (verbose >= 0) {
953 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
954 if (sparecnt)
955 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
956 if (!enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt))
957 fprintf(stderr, " - not enough to start the array.\n");
958 else {
959 if (req_cnt == info.array.raid_disks)
960 fprintf(stderr, " - need all %d to start it", req_cnt);
961 else
962 fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
963 fprintf(stderr, " (use --run to insist).\n");
964 }
965 }
966 if (must_close) close(mdfd);
967 return 1;
968 } else {
969 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
970 * been updated to point to the current locations of devices.
971 * so we can just start the array
972 */
973 unsigned long dev;
974 dev = makedev(devices[chosen_drive].major,
975 devices[chosen_drive].minor);
976 if (ioctl(mdfd, START_ARRAY, dev)) {
977 fprintf(stderr, Name ": Cannot start array: %s\n",
978 strerror(errno));
979 }
980
981 }
982 if (must_close) close(mdfd);
983 return 0;
984 }
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