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Merge branch 'master' into devel-3.0
[thirdparty/mdadm.git] / Assemble.c
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 clean = 0;
115 int must_close = 0;
116 int old_linux = 0;
117 int vers = 0; /* Keep gcc quite - it really is initialised */
118 struct {
119 char *devname;
120 int uptodate; /* set once we decide that this device is as
121 * recent as everything else in the array.
122 */
123 struct mdinfo i;
124 } *devices;
125 int *best = NULL; /* indexed by raid_disk */
126 unsigned int bestcnt = 0;
127 int devcnt = 0;
128 unsigned int okcnt, sparecnt;
129 unsigned int req_cnt;
130 unsigned int i;
131 int most_recent = 0;
132 int chosen_drive;
133 int change = 0;
134 int inargv = 0;
135 int bitmap_done;
136 int start_partial_ok = (runstop >= 0) && (force || devlist==NULL || mdfd < 0);
137 unsigned int num_devs;
138 mddev_dev_t tmpdev;
139 struct mdinfo info;
140 char *avail;
141 int nextspare = 0;
142 int uuid_for_name = 0;
143
144 memset(&info, 0, sizeof(info));
145
146 if (get_linux_version() < 2004000)
147 old_linux = 1;
148
149 if (mdfd >= 0) {
150 vers = md_get_version(mdfd);
151 if (vers <= 0) {
152 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
153 return 1;
154 }
155 if (vers < 9000) {
156 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
157 " Upgrade your kernel or try --build\n");
158 return 1;
159 }
160
161 if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
162 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
163 mddev);
164 return 1;
165 }
166 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
167 }
168 /*
169 * If any subdevs are listed, then any that don't
170 * match ident are discarded. Remainder must all match and
171 * become the array.
172 * If no subdevs, then we scan all devices in the config file, but
173 * there must be something in the identity
174 */
175
176 if (!devlist &&
177 ident->uuid_set == 0 &&
178 ident->super_minor < 0 &&
179 ident->devices == NULL) {
180 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
181 mddev ? mddev : "further assembly");
182 return 1;
183 }
184 if (devlist == NULL)
185 devlist = conf_get_devs();
186 else if (mdfd >= 0)
187 inargv = 1;
188
189 try_again:
190
191 tmpdev = devlist; num_devs = 0;
192 while (tmpdev) {
193 if (tmpdev->used)
194 tmpdev->used = 2;
195 else
196 num_devs++;
197 tmpdev = tmpdev->next;
198 }
199 devices = malloc(num_devs * sizeof(*devices));
200
201 if (!st && ident->st) st = ident->st;
202
203 if (verbose>0)
204 fprintf(stderr, Name ": looking for devices for %s\n",
205 mddev ? mddev : "further assembly");
206
207 /* first walk the list of devices to find a consistent set
208 * that match the criterea, if that is possible.
209 * We flag the one we like with 'used'.
210 */
211 for (tmpdev = devlist;
212 tmpdev;
213 tmpdev = tmpdev->next) {
214 char *devname = tmpdev->devname;
215 int dfd;
216 struct stat stb;
217 struct supertype *tst = dup_super(st);
218
219 if (tmpdev->used > 1) continue;
220
221 if (ident->devices &&
222 !match_oneof(ident->devices, devname)) {
223 if ((inargv && verbose>=0) || verbose > 0)
224 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
225 continue;
226 }
227
228 dfd = dev_open(devname, O_RDONLY|O_EXCL);
229 if (dfd < 0) {
230 if ((inargv && verbose >= 0) || verbose > 0)
231 fprintf(stderr, Name ": cannot open device %s: %s\n",
232 devname, strerror(errno));
233 tmpdev->used = 2;
234 } else if (fstat(dfd, &stb)< 0) {
235 /* Impossible! */
236 fprintf(stderr, Name ": fstat failed for %s: %s\n",
237 devname, strerror(errno));
238 tmpdev->used = 2;
239 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
240 fprintf(stderr, Name ": %s is not a block device.\n",
241 devname);
242 tmpdev->used = 2;
243 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
244 if ((inargv && verbose >= 0) || verbose > 0)
245 fprintf(stderr, Name ": no recogniseable superblock on %s\n",
246 devname);
247 tmpdev->used = 2;
248 } else if (tst->ss->load_super(tst,dfd, NULL)) {
249 if ((inargv && verbose >= 0) || verbose > 0)
250 fprintf( stderr, Name ": no RAID superblock on %s\n",
251 devname);
252 } else {
253 tst->ss->getinfo_super(tst, &info);
254 }
255 if (dfd >= 0) close(dfd);
256
257 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
258 (!tst || !tst->sb ||
259 same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
260 if ((inargv && verbose >= 0) || verbose > 0)
261 fprintf(stderr, Name ": %s has wrong uuid.\n",
262 devname);
263 goto loop;
264 }
265 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
266 (!tst || !tst->sb ||
267 name_matches(info.name, ident->name, homehost)==0)) {
268 if ((inargv && verbose >= 0) || verbose > 0)
269 fprintf(stderr, Name ": %s has wrong name.\n",
270 devname);
271 goto loop;
272 }
273 if (ident->super_minor != UnSet &&
274 (!tst || !tst->sb ||
275 ident->super_minor != info.array.md_minor)) {
276 if ((inargv && verbose >= 0) || verbose > 0)
277 fprintf(stderr, Name ": %s has wrong super-minor.\n",
278 devname);
279 goto loop;
280 }
281 if (ident->level != UnSet &&
282 (!tst || !tst->sb ||
283 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 goto loop;
288 }
289 if (ident->raid_disks != UnSet &&
290 (!tst || !tst->sb ||
291 ident->raid_disks!= info.array.raid_disks)) {
292 if ((inargv && verbose >= 0) || verbose > 0)
293 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
294 devname);
295 goto loop;
296 }
297 if (mdfd < 0) {
298 if (tst == NULL || tst->sb == NULL)
299 continue;
300 switch(tst->ss->match_home(tst, homehost))
301 {
302 case 1: /* happy with match. */
303 break;
304 case -1: /* cannot match */
305 uuid_for_name = 1;
306 break;
307 case 0: /* Doesn't match */
308 if (update)
309 /* We are changing the name*/
310 break;
311 if ((inargv && verbose >= 0) || verbose > 0)
312 fprintf(stderr, Name ": %s is not built for "
313 "host %s - using UUID for "
314 "device name.\n",
315 devname, homehost);
316
317 /* Auto-assemble, and this is not a usable host */
318 /* if update != NULL, we are updating the host
319 * name... */
320 uuid_for_name = 1;
321 break;
322 }
323 }
324 /* If we are this far, then we are nearly commited to this device.
325 * If the super_block doesn't exist, or doesn't match others,
326 * then we probably cannot continue
327 * However if one of the arrays is for the homehost, and
328 * the other isn't that can disambiguate.
329 */
330
331 if (!tst || !tst->sb) {
332 fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
333 devname);
334 if (st)
335 st->ss->free_super(st);
336 return 1;
337 }
338
339 if (st == NULL)
340 st = dup_super(tst);
341 if (st->minor_version == -1)
342 st->minor_version = tst->minor_version;
343 if (st->ss != tst->ss ||
344 st->minor_version != tst->minor_version ||
345 st->ss->compare_super(st, tst) != 0) {
346 /* Some mismatch. If exactly one array matches this host,
347 * we can resolve on that one.
348 * Or, if we are auto assembling, we just ignore the second
349 * for now.
350 */
351 if (mdfd < 0)
352 goto loop;
353 if (homehost) {
354 int first = st->ss->match_home(st, homehost);
355 int last = tst->ss->match_home(tst, homehost);
356 if (first != last &&
357 (first == 1 || last == 1)) {
358 /* We can do something */
359 if (first) {/* just ignore this one */
360 if ((inargv && verbose >= 0) || verbose > 0)
361 fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
362 devname);
363 goto loop;
364 } else { /* reject all those sofar */
365 mddev_dev_t td;
366 if ((inargv && verbose >= 0) || verbose > 0)
367 fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n",
368 devname);
369 for (td=devlist; td != tmpdev; td=td->next)
370 if (td->used == 1)
371 td->used = 0;
372 tmpdev->used = 1;
373 goto loop;
374 }
375 }
376 }
377 fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
378 devname);
379 tst->ss->free_super(tst);
380 st->ss->free_super(st);
381 return 1;
382 }
383
384 tmpdev->used = 1;
385
386 loop:
387 if (tst)
388 tst->ss->free_super(tst);
389 }
390
391 if (mdfd < 0) {
392 /* So... it is up to me to open the device.
393 * We create a name '/dev/md/XXX' based on the info in the
394 * superblock, and call open_mddev on that
395 */
396 mdu_array_info_t inf;
397 char *c;
398 char nbuf[64];
399 int rc;
400
401 if (!st || !st->sb) {
402 return 2;
403 }
404 st->ss->getinfo_super(st, &info);
405 if (uuid_for_name)
406 c = fname_from_uuid(st, &info, nbuf, '-');
407 else {
408 c = strchr(info.name, ':');
409 if (c) c++; else c= info.name;
410 }
411 if (isdigit(*c) && ((ident->autof & 7)==4 || (ident->autof&7)==6))
412 /* /dev/md/d0 style for partitionable */
413 rc = asprintf(&mddev, "/dev/md/d%s", c);
414 else
415 rc = asprintf(&mddev, "/dev/md/%s", c);
416 if (rc < 0)
417 mdfd = -1;
418 else
419 mdfd = open_mddev(mddev, ident->autof);
420 if (mdfd < 0) {
421 st->ss->free_super(st);
422 free(devices);
423 goto try_again;
424 }
425 vers = md_get_version(mdfd);
426 if (ioctl(mdfd, GET_ARRAY_INFO, &inf)==0) {
427 for (tmpdev = devlist ;
428 tmpdev && tmpdev->used != 1;
429 tmpdev = tmpdev->next)
430 ;
431 fprintf(stderr, Name ": %s already active, cannot restart it!\n", mddev);
432 if (tmpdev)
433 fprintf(stderr, Name ": %s needed for %s...\n",
434 mddev, tmpdev->devname);
435 close(mdfd);
436 mdfd = -1;
437 st->ss->free_super(st);
438 free(devices);
439 goto try_again;
440 }
441 must_close = 1;
442 }
443
444 /* Ok, no bad inconsistancy, we can try updating etc */
445 bitmap_done = 0;
446 for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
447 char *devname = tmpdev->devname;
448 struct stat stb;
449 /* looks like a good enough match to update the super block if needed */
450 #ifndef MDASSEMBLE
451 if (update) {
452 int dfd;
453 /* prepare useful information in info structures */
454 struct stat stb2;
455 struct supertype *tst;
456 fstat(mdfd, &stb2);
457
458 if (strcmp(update, "uuid")==0 &&
459 !ident->uuid_set) {
460 int rfd;
461 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
462 read(rfd, ident->uuid, 16) != 16) {
463 *(__u32*)(ident->uuid) = random();
464 *(__u32*)(ident->uuid+1) = random();
465 *(__u32*)(ident->uuid+2) = random();
466 *(__u32*)(ident->uuid+3) = random();
467 }
468 if (rfd >= 0) close(rfd);
469 }
470 dfd = dev_open(devname, O_RDWR|O_EXCL);
471
472 remove_partitions(dfd);
473
474 tst = dup_super(st);
475 tst->ss->load_super(tst, dfd, NULL);
476 tst->ss->getinfo_super(tst, &info);
477
478 memcpy(info.uuid, ident->uuid, 16);
479 strcpy(info.name, ident->name);
480 info.array.md_minor = minor(stb2.st_rdev);
481
482 tst->ss->update_super(tst, &info, update,
483 devname, verbose,
484 ident->uuid_set, homehost);
485 if (strcmp(update, "uuid")==0 &&
486 !ident->uuid_set) {
487 ident->uuid_set = 1;
488 memcpy(ident->uuid, info.uuid, 16);
489 }
490 if (dfd < 0)
491 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
492 devname);
493 else if (tst->ss->store_super(tst, dfd))
494 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
495 devname);
496 if (dfd >= 0)
497 close(dfd);
498
499 if (strcmp(update, "uuid")==0 &&
500 ident->bitmap_fd >= 0 && !bitmap_done) {
501 if (bitmap_update_uuid(ident->bitmap_fd,
502 info.uuid,
503 tst->ss->swapuuid) != 0)
504 fprintf(stderr, Name ": Could not update uuid on external bitmap.\n");
505 else
506 bitmap_done = 1;
507 }
508 tst->ss->free_super(tst);
509 } else
510 #endif
511 {
512 struct supertype *tst = dup_super(st);
513 int dfd;
514 dfd = dev_open(devname, O_RDWR|O_EXCL);
515
516 remove_partitions(dfd);
517
518 tst->ss->load_super(tst, dfd, NULL);
519 tst->ss->getinfo_super(tst, &info);
520 tst->ss->free_super(tst);
521 close(dfd);
522 }
523
524 stat(devname, &stb);
525
526 if (verbose > 0)
527 fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
528 devname, mddev, info.disk.raid_disk);
529 devices[devcnt].devname = devname;
530 devices[devcnt].uptodate = 0;
531 devices[devcnt].i = info;
532 devices[devcnt].i.disk.major = major(stb.st_rdev);
533 devices[devcnt].i.disk.minor = minor(stb.st_rdev);
534 if (most_recent < devcnt) {
535 if (devices[devcnt].i.events
536 > devices[most_recent].i.events)
537 most_recent = devcnt;
538 }
539 if (info.array.level == -4)
540 /* with multipath, the raid_disk from the superblock is meaningless */
541 i = devcnt;
542 else
543 i = devices[devcnt].i.disk.raid_disk;
544 if (i+1 == 0) {
545 if (nextspare < info.array.raid_disks)
546 nextspare = info.array.raid_disks;
547 i = nextspare++;
548 } else {
549 if (i >= info.array.raid_disks &&
550 i >= nextspare)
551 nextspare = i+1;
552 }
553 if (i < 10000) {
554 if (i >= bestcnt) {
555 unsigned int newbestcnt = i+10;
556 int *newbest = malloc(sizeof(int)*newbestcnt);
557 unsigned int c;
558 for (c=0; c < newbestcnt; c++)
559 if (c < bestcnt)
560 newbest[c] = best[c];
561 else
562 newbest[c] = -1;
563 if (best)free(best);
564 best = newbest;
565 bestcnt = newbestcnt;
566 }
567 if (best[i] >=0 &&
568 devices[best[i]].i.events
569 == devices[devcnt].i.events
570 && (devices[best[i]].i.disk.minor
571 != devices[devcnt].i.disk.minor)
572 && st->ss == &super0
573 && info.array.level != LEVEL_MULTIPATH) {
574 /* two different devices with identical superblock.
575 * Could be a mis-detection caused by overlapping
576 * partitions. fail-safe.
577 */
578 fprintf(stderr, Name ": WARNING %s and %s appear"
579 " to have very similar superblocks.\n"
580 " If they are really different, "
581 "please --zero the superblock on one\n"
582 " If they are the same or overlap,"
583 " please remove one from %s.\n",
584 devices[best[i]].devname, devname,
585 inargv ? "the list" :
586 "the\n DEVICE list in mdadm.conf"
587 );
588 if (must_close) close(mdfd);
589 return 1;
590 }
591 if (best[i] == -1
592 || (devices[best[i]].i.events
593 < devices[devcnt].i.events))
594 best[i] = devcnt;
595 }
596 devcnt++;
597 }
598
599 if (devcnt == 0) {
600 fprintf(stderr, Name ": no devices found for %s\n",
601 mddev);
602 if (st)
603 st->ss->free_super(st);
604 if (must_close) close(mdfd);
605 return 1;
606 }
607
608 if (update && strcmp(update, "byteorder")==0)
609 st->minor_version = 90;
610
611 st->ss->getinfo_super(st, &info);
612 clean = info.array.state & 1;
613
614 /* now we have some devices that might be suitable.
615 * I wonder how many
616 */
617 avail = malloc(info.array.raid_disks);
618 memset(avail, 0, info.array.raid_disks);
619 okcnt = 0;
620 sparecnt=0;
621 for (i=0; i< bestcnt ;i++) {
622 int j = best[i];
623 int event_margin = 1; /* always allow a difference of '1'
624 * like the kernel does
625 */
626 if (j < 0) continue;
627 /* note: we ignore error flags in multipath arrays
628 * as they don't make sense
629 */
630 if (info.array.level != -4)
631 if (!(devices[j].i.disk.state & (1<<MD_DISK_SYNC))) {
632 if (!(devices[j].i.disk.state
633 & (1<<MD_DISK_FAULTY)))
634 sparecnt++;
635 continue;
636 }
637 if (devices[j].i.events+event_margin >=
638 devices[most_recent].i.events) {
639 devices[j].uptodate = 1;
640 if (i < info.array.raid_disks) {
641 okcnt++;
642 avail[i]=1;
643 } else
644 sparecnt++;
645 }
646 }
647 while (force && !enough(info.array.level, info.array.raid_disks,
648 info.array.layout, 1,
649 avail, okcnt)) {
650 /* Choose the newest best drive which is
651 * not up-to-date, update the superblock
652 * and add it.
653 */
654 int fd;
655 struct supertype *tst;
656 long long current_events;
657 chosen_drive = -1;
658 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
659 int j = best[i];
660 if (j>=0 &&
661 !devices[j].uptodate &&
662 devices[j].i.events > 0 &&
663 (chosen_drive < 0 ||
664 devices[j].i.events
665 > devices[chosen_drive].i.events))
666 chosen_drive = j;
667 }
668 if (chosen_drive < 0)
669 break;
670 current_events = devices[chosen_drive].i.events;
671 add_another:
672 if (verbose >= 0)
673 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
674 devices[chosen_drive].devname,
675 devices[chosen_drive].i.disk.raid_disk,
676 (int)(devices[chosen_drive].i.events),
677 (int)(devices[most_recent].i.events));
678 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
679 if (fd < 0) {
680 fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
681 devices[chosen_drive].devname);
682 devices[chosen_drive].i.events = 0;
683 continue;
684 }
685 tst = dup_super(st);
686 if (tst->ss->load_super(tst,fd, NULL)) {
687 close(fd);
688 fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
689 devices[chosen_drive].devname);
690 devices[chosen_drive].i.events = 0;
691 continue;
692 }
693 info.events = devices[most_recent].i.events;
694 tst->ss->update_super(tst, &info, "force-one",
695 devices[chosen_drive].devname, verbose,
696 0, NULL);
697
698 if (tst->ss->store_super(tst, fd)) {
699 close(fd);
700 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
701 devices[chosen_drive].devname);
702 devices[chosen_drive].i.events = 0;
703 tst->ss->free_super(tst);
704 continue;
705 }
706 close(fd);
707 devices[chosen_drive].i.events = devices[most_recent].i.events;
708 devices[chosen_drive].uptodate = 1;
709 avail[chosen_drive] = 1;
710 okcnt++;
711 tst->ss->free_super(tst);
712
713 /* If there are any other drives of the same vintage,
714 * add them in as well. We can't lose and we might gain
715 */
716 for (i=0; i<info.array.raid_disks && i < bestcnt ; i++) {
717 int j = best[i];
718 if (j >= 0 &&
719 !devices[j].uptodate &&
720 devices[j].i.events > 0 &&
721 devices[j].i.events == current_events) {
722 chosen_drive = j;
723 goto add_another;
724 }
725 }
726 }
727
728 /* Now we want to look at the superblock which the kernel will base things on
729 * and compare the devices that we think are working with the devices that the
730 * superblock thinks are working.
731 * If there are differences and --force is given, then update this chosen
732 * superblock.
733 */
734 chosen_drive = -1;
735 st->ss->free_super(st);
736 for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
737 int j = best[i];
738 int fd;
739
740 if (j<0)
741 continue;
742 if (!devices[j].uptodate)
743 continue;
744 chosen_drive = j;
745 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
746 fprintf(stderr, Name ": Cannot open %s: %s\n",
747 devices[j].devname, strerror(errno));
748 if (must_close) close(mdfd);
749 return 1;
750 }
751 if (st->ss->load_super(st,fd, NULL)) {
752 close(fd);
753 fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
754 devices[j].devname);
755 if (must_close) close(mdfd);
756 return 1;
757 }
758 close(fd);
759 }
760 if (st->sb == NULL) {
761 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
762 if (must_close) close(mdfd);
763 return 1;
764 }
765 st->ss->getinfo_super(st, &info);
766 #ifndef MDASSEMBLE
767 sysfs_init(&info, mdfd, 0);
768 #endif
769 for (i=0; i<bestcnt; i++) {
770 int j = best[i];
771 unsigned int desired_state;
772
773 if (i < info.array.raid_disks)
774 desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
775 else
776 desired_state = 0;
777
778 if (j<0)
779 continue;
780 if (!devices[j].uptodate)
781 continue;
782
783 devices[j].i.disk.state = desired_state;
784
785 if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
786 verbose, 0, NULL)) {
787 if (force) {
788 if (verbose >= 0)
789 fprintf(stderr, Name ": "
790 "clearing FAULTY flag for device %d in %s for %s\n",
791 j, mddev, devices[j].devname);
792 change = 1;
793 } else {
794 if (verbose >= -1)
795 fprintf(stderr, Name ": "
796 "device %d in %s has wrong state in superblock, but %s seems ok\n",
797 i, mddev, devices[j].devname);
798 }
799 }
800 #if 0
801 if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
802 fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
803 i, mddev);
804 }
805 #endif
806 }
807 if (force && !clean &&
808 !enough(info.array.level, info.array.raid_disks,
809 info.array.layout, clean,
810 avail, okcnt)) {
811 change += st->ss->update_super(st, &info, "force-array",
812 devices[chosen_drive].devname, verbose,
813 0, NULL);
814 clean = 1;
815 }
816
817 if (change) {
818 int fd;
819 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
820 if (fd < 0) {
821 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
822 devices[chosen_drive].devname);
823 if (must_close) close(mdfd);
824 return 1;
825 }
826 if (st->ss->store_super(st, fd)) {
827 close(fd);
828 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
829 devices[chosen_drive].devname);
830 if (must_close) close(mdfd);
831 return 1;
832 }
833 close(fd);
834 }
835
836 /* If we are in the middle of a reshape we may need to restore saved data
837 * that was moved aside due to the reshape overwriting live data
838 * The code of doing this lives in Grow.c
839 */
840 #ifndef MDASSEMBLE
841 if (info.reshape_active) {
842 int err = 0;
843 int *fdlist = malloc(sizeof(int)* bestcnt);
844 for (i=0; i<bestcnt; i++) {
845 int j = best[i];
846 if (j >= 0) {
847 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
848 if (fdlist[i] < 0) {
849 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
850 devices[j].devname);
851 err = 1;
852 break;
853 }
854 } else
855 fdlist[i] = -1;
856 }
857 if (!err)
858 err = Grow_restart(st, &info, fdlist, bestcnt, backup_file);
859 while (i>0) {
860 i--;
861 if (fdlist[i]>=0) close(fdlist[i]);
862 }
863 if (err) {
864 fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
865 if (must_close) close(mdfd);
866 return err;
867 }
868 }
869 #endif
870 /* count number of in-sync devices according to the superblock.
871 * We must have this number to start the array without -s or -R
872 */
873 req_cnt = info.array.working_disks;
874
875 /* Almost ready to actually *do* something */
876 if (!old_linux) {
877 int rv;
878
879 rv = set_array_info(mdfd, st, &info);
880 if (rv) {
881 fprintf(stderr, Name ": failed to set array info for %s: %s\n",
882 mddev, strerror(errno));
883 if (must_close) close(mdfd);
884 return 1;
885 }
886 if (ident->bitmap_fd >= 0) {
887 if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
888 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
889 if (must_close) close(mdfd);
890 return 1;
891 }
892 } else if (ident->bitmap_file) {
893 /* From config file */
894 int bmfd = open(ident->bitmap_file, O_RDWR);
895 if (bmfd < 0) {
896 fprintf(stderr, Name ": Could not open bitmap file %s\n",
897 ident->bitmap_file);
898 if (must_close) close(mdfd);
899 return 1;
900 }
901 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
902 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
903 close(bmfd);
904 if (must_close) close(mdfd);
905 return 1;
906 }
907 close(bmfd);
908 }
909
910 /* First, add the raid disks, but add the chosen one last */
911 for (i=0; i<= bestcnt; i++) {
912 int j;
913 if (i < bestcnt) {
914 j = best[i];
915 if (j == chosen_drive)
916 continue;
917 } else
918 j = chosen_drive;
919
920 if (j >= 0 /* && devices[j].uptodate */) {
921 rv = add_disk(mdfd, st, &info, &devices[j].i);
922
923 if (rv) {
924 fprintf(stderr, Name ": failed to add "
925 "%s to %s: %s\n",
926 devices[j].devname,
927 mddev,
928 strerror(errno));
929 if (i < info.array.raid_disks
930 || i == bestcnt)
931 okcnt--;
932 else
933 sparecnt--;
934 } else if (verbose > 0)
935 fprintf(stderr, Name ": added %s "
936 "to %s as %d\n",
937 devices[j].devname, mddev,
938 devices[j].i.disk.raid_disk);
939 } else if (verbose > 0 && i < info.array.raid_disks)
940 fprintf(stderr, Name ": no uptodate device for "
941 "slot %d of %s\n",
942 i, mddev);
943 }
944
945 if (info.array.level == LEVEL_CONTAINER) {
946 if (verbose >= 0) {
947 fprintf(stderr, Name ": Container %s has been "
948 "assembled with %d drive%s",
949 mddev, okcnt+sparecnt, okcnt+sparecnt==1?"":"s");
950 if (okcnt < info.array.raid_disks)
951 fprintf(stderr, " (out of %d)",
952 info.array.raid_disks);
953 fprintf(stderr, "\n");
954 }
955 if (must_close)
956 close(mdfd);
957 return 0;
958 }
959
960 if (runstop == 1 ||
961 (runstop <= 0 &&
962 ( enough(info.array.level, info.array.raid_disks,
963 info.array.layout, clean, avail, okcnt) &&
964 (okcnt >= req_cnt || start_partial_ok)
965 ))) {
966 if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
967 if (verbose >= 0) {
968 fprintf(stderr, Name ": %s has been started with %d drive%s",
969 mddev, okcnt, okcnt==1?"":"s");
970 if (okcnt < info.array.raid_disks)
971 fprintf(stderr, " (out of %d)", info.array.raid_disks);
972 if (sparecnt)
973 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
974 fprintf(stderr, ".\n");
975 }
976 if (must_close) {
977 int usecs = 1;
978 close(mdfd);
979 /* There is a nasty race with 'mdadm --monitor'.
980 * If it opens this device before we close it,
981 * it gets an incomplete open on which IO
982 * doesn't work and the capacity is
983 * wrong.
984 * If we reopen (to check for layered devices)
985 * before --monitor closes, we loose.
986 *
987 * So: wait upto 1 second for there to be
988 * a non-zero capacity.
989 */
990 while (usecs < 1000) {
991 mdfd = open(mddev, O_RDONLY);
992 if (mdfd >= 0) {
993 unsigned long long size;
994 if (get_dev_size(mdfd, NULL, &size) &&
995 size > 0)
996 break;
997 close(mdfd);
998 }
999 usleep(usecs);
1000 usecs <<= 1;
1001 }
1002 }
1003 return 0;
1004 }
1005 fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
1006 mddev, strerror(errno));
1007
1008 if (!enough(info.array.level, info.array.raid_disks,
1009 info.array.layout, 1, avail, okcnt))
1010 fprintf(stderr, Name ": Not enough devices to "
1011 "start the array.\n");
1012 else if (!enough(info.array.level,
1013 info.array.raid_disks,
1014 info.array.layout, clean,
1015 avail, okcnt))
1016 fprintf(stderr, Name ": Not enough devices to "
1017 "start the array while not clean "
1018 "- consider --force.\n");
1019
1020 if (must_close) {
1021 ioctl(mdfd, STOP_ARRAY, NULL);
1022 close(mdfd);
1023 }
1024 return 1;
1025 }
1026 if (runstop == -1) {
1027 fprintf(stderr, Name ": %s assembled from %d drive%s",
1028 mddev, okcnt, okcnt==1?"":"s");
1029 if (okcnt != info.array.raid_disks)
1030 fprintf(stderr, " (out of %d)", info.array.raid_disks);
1031 fprintf(stderr, ", but not started.\n");
1032 if (must_close) close(mdfd);
1033 return 0;
1034 }
1035 if (verbose >= -1) {
1036 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
1037 if (sparecnt)
1038 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1039 if (!enough(info.array.level, info.array.raid_disks,
1040 info.array.layout, 1, avail, okcnt))
1041 fprintf(stderr, " - not enough to start the array.\n");
1042 else if (!enough(info.array.level,
1043 info.array.raid_disks,
1044 info.array.layout, clean,
1045 avail, okcnt))
1046 fprintf(stderr, " - not enough to start the "
1047 "array while not clean - consider "
1048 "--force.\n");
1049 else {
1050 if (req_cnt == info.array.raid_disks)
1051 fprintf(stderr, " - need all %d to start it", req_cnt);
1052 else
1053 fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
1054 fprintf(stderr, " (use --run to insist).\n");
1055 }
1056 }
1057 if (must_close) {
1058 ioctl(mdfd, STOP_ARRAY, NULL);
1059 close(mdfd);
1060 }
1061 return 1;
1062 } else {
1063 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1064 * been updated to point to the current locations of devices.
1065 * so we can just start the array
1066 */
1067 unsigned long dev;
1068 dev = makedev(devices[chosen_drive].i.disk.major,
1069 devices[chosen_drive].i.disk.minor);
1070 if (ioctl(mdfd, START_ARRAY, dev)) {
1071 fprintf(stderr, Name ": Cannot start array: %s\n",
1072 strerror(errno));
1073 }
1074
1075 }
1076 if (must_close) close(mdfd);
1077 return 0;
1078 }
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