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Release mdadm-2.6.9
[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
143 if (get_linux_version() < 2004000)
144 old_linux = 1;
145
146 if (mdfd >= 0) {
147 vers = md_get_version(mdfd);
148 if (vers <= 0) {
149 fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
150 return 1;
151 }
152 if (vers < 9000) {
153 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
154 " Upgrade your kernel or try --build\n");
155 return 1;
156 }
157
158 if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
159 fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
160 mddev);
161 return 1;
162 }
163 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
164 }
165 /*
166 * If any subdevs are listed, then any that don't
167 * match ident are discarded. Remainder must all match and
168 * become the array.
169 * If no subdevs, then we scan all devices in the config file, but
170 * there must be something in the identity
171 */
172
173 if (!devlist &&
174 ident->uuid_set == 0 &&
175 ident->super_minor < 0 &&
176 ident->devices == NULL) {
177 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
178 mddev ? mddev : "further assembly");
179 return 1;
180 }
181 if (devlist == NULL)
182 devlist = conf_get_devs();
183 else if (mdfd >= 0)
184 inargv = 1;
185
186 try_again:
187
188 tmpdev = devlist; num_devs = 0;
189 while (tmpdev) {
190 if (tmpdev->used)
191 tmpdev->used = 2;
192 else
193 num_devs++;
194 tmpdev = tmpdev->next;
195 }
196 devices = malloc(num_devs * sizeof(*devices));
197
198 if (!st && ident->st) st = ident->st;
199
200 if (verbose>0)
201 fprintf(stderr, Name ": looking for devices for %s\n",
202 mddev ? mddev : "further assembly");
203
204 /* first walk the list of devices to find a consistent set
205 * that match the criterea, if that is possible.
206 * We flag the one we like with 'used'.
207 */
208 for (tmpdev = devlist;
209 tmpdev;
210 tmpdev = tmpdev->next) {
211 char *devname = tmpdev->devname;
212 int dfd;
213 struct stat stb;
214 struct supertype *tst = dup_super(st);
215
216 if (tmpdev->used > 1) continue;
217
218 if (ident->devices &&
219 !match_oneof(ident->devices, devname)) {
220 if ((inargv && verbose>=0) || verbose > 0)
221 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
222 continue;
223 }
224
225 dfd = dev_open(devname, O_RDONLY|O_EXCL);
226 if (dfd < 0) {
227 if ((inargv && verbose >= 0) || verbose > 0)
228 fprintf(stderr, Name ": cannot open device %s: %s\n",
229 devname, strerror(errno));
230 tmpdev->used = 2;
231 } else if (fstat(dfd, &stb)< 0) {
232 /* Impossible! */
233 fprintf(stderr, Name ": fstat failed for %s: %s\n",
234 devname, strerror(errno));
235 tmpdev->used = 2;
236 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
237 fprintf(stderr, Name ": %s is not a block device.\n",
238 devname);
239 tmpdev->used = 2;
240 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
241 if ((inargv && verbose >= 0) || verbose > 0)
242 fprintf(stderr, Name ": no recogniseable superblock on %s\n",
243 devname);
244 tmpdev->used = 2;
245 } else if (tst->ss->load_super(tst,dfd, NULL)) {
246 if ((inargv && verbose >= 0) || verbose > 0)
247 fprintf( stderr, Name ": no RAID superblock on %s\n",
248 devname);
249 } else {
250 tst->ss->getinfo_super(tst, &info);
251 }
252 if (dfd >= 0) close(dfd);
253
254 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
255 (!tst || !tst->sb ||
256 same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
257 if ((inargv && verbose >= 0) || verbose > 0)
258 fprintf(stderr, Name ": %s has wrong uuid.\n",
259 devname);
260 goto loop;
261 }
262 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
263 (!tst || !tst->sb ||
264 name_matches(info.name, ident->name, homehost)==0)) {
265 if ((inargv && verbose >= 0) || verbose > 0)
266 fprintf(stderr, Name ": %s has wrong name.\n",
267 devname);
268 goto loop;
269 }
270 if (ident->super_minor != UnSet &&
271 (!tst || !tst->sb ||
272 ident->super_minor != info.array.md_minor)) {
273 if ((inargv && verbose >= 0) || verbose > 0)
274 fprintf(stderr, Name ": %s has wrong super-minor.\n",
275 devname);
276 goto loop;
277 }
278 if (ident->level != UnSet &&
279 (!tst || !tst->sb ||
280 ident->level != info.array.level)) {
281 if ((inargv && verbose >= 0) || verbose > 0)
282 fprintf(stderr, Name ": %s has wrong raid level.\n",
283 devname);
284 goto loop;
285 }
286 if (ident->raid_disks != UnSet &&
287 (!tst || !tst->sb ||
288 ident->raid_disks!= info.array.raid_disks)) {
289 if ((inargv && verbose >= 0) || verbose > 0)
290 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
291 devname);
292 goto loop;
293 }
294 if (mdfd < 0) {
295 if (tst == NULL || tst->sb == NULL)
296 continue;
297 if (update == NULL &&
298 tst->ss->match_home(tst, homehost)==0) {
299 if ((inargv && verbose >= 0) || verbose > 0)
300 fprintf(stderr, Name ": %s is not built for host %s.\n",
301 devname, homehost);
302 /* Auto-assemble, and this is not a usable host */
303 /* if update != NULL, we are updating the host
304 * name... */
305 goto loop;
306 }
307 }
308 /* If we are this far, then we are nearly commited to this device.
309 * If the super_block doesn't exist, or doesn't match others,
310 * then we probably cannot continue
311 * However if one of the arrays is for the homehost, and
312 * the other isn't that can disambiguate.
313 */
314
315 if (!tst || !tst->sb) {
316 fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
317 devname);
318 if (st)
319 st->ss->free_super(st);
320 return 1;
321 }
322
323 if (st == NULL)
324 st = dup_super(tst);
325 if (st->minor_version == -1)
326 st->minor_version = tst->minor_version;
327 if (st->ss != tst->ss ||
328 st->minor_version != tst->minor_version ||
329 st->ss->compare_super(st, tst) != 0) {
330 /* Some mismatch. If exactly one array matches this host,
331 * we can resolve on that one.
332 * Or, if we are auto assembling, we just ignore the second
333 * for now.
334 */
335 if (mdfd < 0)
336 goto loop;
337 if (homehost) {
338 int first = st->ss->match_home(st, homehost);
339 int last = tst->ss->match_home(tst, homehost);
340 if (first+last == 1) {
341 /* We can do something */
342 if (first) {/* just ignore this one */
343 if ((inargv && verbose >= 0) || verbose > 0)
344 fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
345 devname);
346 goto loop;
347 } else { /* reject all those sofar */
348 mddev_dev_t td;
349 if ((inargv && verbose >= 0) || verbose > 0)
350 fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n",
351 devname);
352 for (td=devlist; td != tmpdev; td=td->next)
353 if (td->used == 1)
354 td->used = 0;
355 tmpdev->used = 1;
356 goto loop;
357 }
358 }
359 }
360 fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
361 devname);
362 tst->ss->free_super(tst);
363 st->ss->free_super(st);
364 return 1;
365 }
366
367 tmpdev->used = 1;
368
369 loop:
370 if (tst)
371 tst->ss->free_super(tst);
372 }
373
374 if (mdfd < 0) {
375 /* So... it is up to me to open the device.
376 * We create a name '/dev/md/XXX' based on the info in the
377 * superblock, and call open_mddev on that
378 */
379 mdu_array_info_t inf;
380 char *c;
381 if (!st || !st->sb) {
382 return 2;
383 }
384 st->ss->getinfo_super(st, &info);
385 c = strchr(info.name, ':');
386 if (c) c++; else c= info.name;
387 if (isdigit(*c) && ((ident->autof & 7)==4 || (ident->autof&7)==6))
388 /* /dev/md/d0 style for partitionable */
389 xasprintf(&mddev, "/dev/md/d%s", c);
390 else
391 xasprintf(&mddev, "/dev/md/%s", c);
392 mdfd = open_mddev(mddev, ident->autof);
393 if (mdfd < 0) {
394 st->ss->free_super(st);
395 free(devices);
396 goto try_again;
397 }
398 vers = md_get_version(mdfd);
399 if (ioctl(mdfd, GET_ARRAY_INFO, &inf)==0) {
400 for (tmpdev = devlist ;
401 tmpdev && tmpdev->used != 1;
402 tmpdev = tmpdev->next)
403 ;
404 fprintf(stderr, Name ": %s already active, cannot restart it!\n", mddev);
405 if (tmpdev)
406 fprintf(stderr, Name ": %s needed for %s...\n",
407 mddev, tmpdev->devname);
408 close(mdfd);
409 mdfd = -1;
410 st->ss->free_super(st);
411 free(devices);
412 goto try_again;
413 }
414 must_close = 1;
415 }
416
417 /* Ok, no bad inconsistancy, we can try updating etc */
418 bitmap_done = 0;
419 for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
420 char *devname = tmpdev->devname;
421 struct stat stb;
422 /* looks like a good enough match to update the super block if needed */
423 #ifndef MDASSEMBLE
424 if (update) {
425 int dfd;
426 /* prepare useful information in info structures */
427 struct stat stb2;
428 struct supertype *tst;
429 fstat(mdfd, &stb2);
430
431 if (strcmp(update, "uuid")==0 &&
432 !ident->uuid_set) {
433 int rfd;
434 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
435 read(rfd, ident->uuid, 16) != 16) {
436 *(__u32*)(ident->uuid) = random();
437 *(__u32*)(ident->uuid+1) = random();
438 *(__u32*)(ident->uuid+2) = random();
439 *(__u32*)(ident->uuid+3) = random();
440 }
441 if (rfd >= 0) close(rfd);
442 }
443 dfd = dev_open(devname, O_RDWR|O_EXCL);
444
445 remove_partitions(dfd);
446
447 tst = dup_super(st);
448 tst->ss->load_super(tst, dfd, NULL);
449 tst->ss->getinfo_super(tst, &info);
450
451 memcpy(info.uuid, ident->uuid, 16);
452 strcpy(info.name, ident->name);
453 info.array.md_minor = minor(stb2.st_rdev);
454
455 tst->ss->update_super(tst, &info, update,
456 devname, verbose,
457 ident->uuid_set, homehost);
458 if (strcmp(update, "uuid")==0 &&
459 !ident->uuid_set) {
460 ident->uuid_set = 1;
461 memcpy(ident->uuid, info.uuid, 16);
462 }
463 if (dfd < 0)
464 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
465 devname);
466 else if (tst->ss->store_super(tst, dfd))
467 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
468 devname);
469 if (dfd >= 0)
470 close(dfd);
471
472 if (strcmp(update, "uuid")==0 &&
473 ident->bitmap_fd >= 0 && !bitmap_done) {
474 if (bitmap_update_uuid(ident->bitmap_fd,
475 info.uuid,
476 tst->ss->swapuuid) != 0)
477 fprintf(stderr, Name ": Could not update uuid on external bitmap.\n");
478 else
479 bitmap_done = 1;
480 }
481 tst->ss->free_super(tst);
482 } else
483 #endif
484 {
485 struct supertype *tst = dup_super(st);
486 int dfd;
487 dfd = dev_open(devname, O_RDWR|O_EXCL);
488
489 remove_partitions(dfd);
490
491 tst->ss->load_super(tst, dfd, NULL);
492 tst->ss->getinfo_super(tst, &info);
493 tst->ss->free_super(tst);
494 close(dfd);
495 }
496
497 stat(devname, &stb);
498
499 if (verbose > 0)
500 fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
501 devname, mddev, info.disk.raid_disk);
502 devices[devcnt].devname = devname;
503 devices[devcnt].uptodate = 0;
504 devices[devcnt].i = info;
505 devices[devcnt].i.disk.major = major(stb.st_rdev);
506 devices[devcnt].i.disk.minor = minor(stb.st_rdev);
507 if (most_recent < devcnt) {
508 if (devices[devcnt].i.events
509 > devices[most_recent].i.events)
510 most_recent = devcnt;
511 }
512 if (info.array.level == -4)
513 /* with multipath, the raid_disk from the superblock is meaningless */
514 i = devcnt;
515 else
516 i = devices[devcnt].i.disk.raid_disk;
517 if (i+1 == 0) {
518 if (nextspare < info.array.raid_disks)
519 nextspare = info.array.raid_disks;
520 i = nextspare++;
521 } else {
522 if (i >= info.array.raid_disks &&
523 i >= nextspare)
524 nextspare = i+1;
525 }
526 if (i < 10000) {
527 if (i >= bestcnt) {
528 unsigned int newbestcnt = i+10;
529 int *newbest = malloc(sizeof(int)*newbestcnt);
530 unsigned int c;
531 for (c=0; c < newbestcnt; c++)
532 if (c < bestcnt)
533 newbest[c] = best[c];
534 else
535 newbest[c] = -1;
536 if (best)free(best);
537 best = newbest;
538 bestcnt = newbestcnt;
539 }
540 if (best[i] >=0 &&
541 devices[best[i]].i.events
542 == devices[devcnt].i.events
543 && (devices[best[i]].i.disk.minor
544 != devices[devcnt].i.disk.minor)
545 && st->ss->major == 0
546 && info.array.level != -4) {
547 /* two different devices with identical superblock.
548 * Could be a mis-detection caused by overlapping
549 * partitions. fail-safe.
550 */
551 fprintf(stderr, Name ": WARNING %s and %s appear"
552 " to have very similar superblocks.\n"
553 " If they are really different, "
554 "please --zero the superblock on one\n"
555 " If they are the same or overlap,"
556 " please remove one from %s.\n",
557 devices[best[i]].devname, devname,
558 inargv ? "the list" :
559 "the\n DEVICE list in mdadm.conf"
560 );
561 if (must_close) close(mdfd);
562 return 1;
563 }
564 if (best[i] == -1
565 || (devices[best[i]].i.events
566 < devices[devcnt].i.events))
567 best[i] = devcnt;
568 }
569 devcnt++;
570 }
571
572 if (devcnt == 0) {
573 fprintf(stderr, Name ": no devices found for %s\n",
574 mddev);
575 if (st)
576 st->ss->free_super(st);
577 if (must_close) close(mdfd);
578 return 1;
579 }
580
581 if (update && strcmp(update, "byteorder")==0)
582 st->minor_version = 90;
583
584 st->ss->getinfo_super(st, &info);
585 clean = info.array.state & 1;
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].i.disk.state & (1<<MD_DISK_SYNC))) {
605 if (!(devices[j].i.disk.state
606 & (1<<MD_DISK_FAULTY)))
607 sparecnt++;
608 continue;
609 }
610 if (devices[j].i.events+event_margin >=
611 devices[most_recent].i.events) {
612 devices[j].uptodate = 1;
613 if (i < info.array.raid_disks) {
614 okcnt++;
615 avail[i]=1;
616 } else
617 sparecnt++;
618 }
619 }
620 while (force && !enough(info.array.level, info.array.raid_disks,
621 info.array.layout, 1,
622 avail, okcnt)) {
623 /* Choose the newest best drive which is
624 * not up-to-date, update the superblock
625 * and add it.
626 */
627 int fd;
628 struct supertype *tst;
629 long long current_events;
630 chosen_drive = -1;
631 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
632 int j = best[i];
633 if (j>=0 &&
634 !devices[j].uptodate &&
635 (chosen_drive < 0 ||
636 devices[j].i.events
637 > devices[chosen_drive].i.events))
638 chosen_drive = j;
639 }
640 if (chosen_drive < 0)
641 break;
642 current_events = devices[chosen_drive].i.events;
643 add_another:
644 if (verbose >= 0)
645 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
646 devices[chosen_drive].devname,
647 devices[chosen_drive].i.disk.raid_disk,
648 (int)(devices[chosen_drive].i.events),
649 (int)(devices[most_recent].i.events));
650 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
651 if (fd < 0) {
652 fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
653 devices[chosen_drive].devname);
654 devices[chosen_drive].i.events = 0;
655 continue;
656 }
657 tst = dup_super(st);
658 if (tst->ss->load_super(tst,fd, NULL)) {
659 close(fd);
660 fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
661 devices[chosen_drive].devname);
662 devices[chosen_drive].i.events = 0;
663 continue;
664 }
665 info.events = devices[most_recent].i.events;
666 tst->ss->update_super(tst, &info, "force-one",
667 devices[chosen_drive].devname, verbose,
668 0, NULL);
669
670 if (tst->ss->store_super(tst, fd)) {
671 close(fd);
672 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
673 devices[chosen_drive].devname);
674 devices[chosen_drive].i.events = 0;
675 tst->ss->free_super(tst);
676 continue;
677 }
678 close(fd);
679 devices[chosen_drive].i.events = devices[most_recent].i.events;
680 devices[chosen_drive].uptodate = 1;
681 avail[chosen_drive] = 1;
682 okcnt++;
683 tst->ss->free_super(tst);
684
685 /* If there are any other drives of the same vintage,
686 * add them in as well. We can't lose and we might gain
687 */
688 for (i=0; i<info.array.raid_disks && i < bestcnt ; i++) {
689 int j = best[i];
690 if (j >= 0 &&
691 !devices[j].uptodate &&
692 devices[j].i.events == current_events) {
693 chosen_drive = j;
694 goto add_another;
695 }
696 }
697 }
698
699 /* Now we want to look at the superblock which the kernel will base things on
700 * and compare the devices that we think are working with the devices that the
701 * superblock thinks are working.
702 * If there are differences and --force is given, then update this chosen
703 * superblock.
704 */
705 chosen_drive = -1;
706 st->ss->free_super(st);
707 for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
708 int j = best[i];
709 int fd;
710
711 if (j<0)
712 continue;
713 if (!devices[j].uptodate)
714 continue;
715 chosen_drive = j;
716 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
717 fprintf(stderr, Name ": Cannot open %s: %s\n",
718 devices[j].devname, strerror(errno));
719 if (must_close) close(mdfd);
720 return 1;
721 }
722 if (st->ss->load_super(st,fd, NULL)) {
723 close(fd);
724 fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
725 devices[j].devname);
726 if (must_close) close(mdfd);
727 return 1;
728 }
729 close(fd);
730 }
731 if (st->sb == NULL) {
732 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
733 if (must_close) close(mdfd);
734 return 1;
735 }
736 st->ss->getinfo_super(st, &info);
737 for (i=0; i<bestcnt; i++) {
738 int j = best[i];
739 unsigned int desired_state;
740
741 if (i < info.array.raid_disks)
742 desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
743 else
744 desired_state = 0;
745
746 if (j<0)
747 continue;
748 if (!devices[j].uptodate)
749 continue;
750
751 devices[j].i.disk.state = desired_state;
752 if (!(devices[j].i.array.state & 1))
753 clean = 0;
754
755 if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
756 verbose, 0, NULL)) {
757 if (force) {
758 if (verbose >= 0)
759 fprintf(stderr, Name ": "
760 "clearing FAULTY flag for device %d in %s for %s\n",
761 j, mddev, devices[j].devname);
762 change = 1;
763 } else {
764 if (verbose >= -1)
765 fprintf(stderr, Name ": "
766 "device %d in %s has wrong state in superblock, but %s seems ok\n",
767 i, mddev, devices[j].devname);
768 }
769 }
770 #if 0
771 if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
772 fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
773 i, mddev);
774 }
775 #endif
776 }
777 if (force && !clean &&
778 !enough(info.array.level, info.array.raid_disks,
779 info.array.layout, clean,
780 avail, okcnt)) {
781 change += st->ss->update_super(st, &info, "force-array",
782 devices[chosen_drive].devname, verbose,
783 0, NULL);
784 clean = 1;
785 }
786
787 if (change) {
788 int fd;
789 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
790 if (fd < 0) {
791 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
792 devices[chosen_drive].devname);
793 if (must_close) close(mdfd);
794 return 1;
795 }
796 if (st->ss->store_super(st, fd)) {
797 close(fd);
798 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
799 devices[chosen_drive].devname);
800 if (must_close) close(mdfd);
801 return 1;
802 }
803 close(fd);
804 }
805
806 /* If we are in the middle of a reshape we may need to restore saved data
807 * that was moved aside due to the reshape overwriting live data
808 * The code of doing this lives in Grow.c
809 */
810 #ifndef MDASSEMBLE
811 if (info.reshape_active) {
812 int err = 0;
813 int *fdlist = malloc(sizeof(int)* bestcnt);
814 for (i=0; i<bestcnt; i++) {
815 int j = best[i];
816 if (j >= 0) {
817 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
818 if (fdlist[i] < 0) {
819 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
820 devices[j].devname);
821 err = 1;
822 break;
823 }
824 } else
825 fdlist[i] = -1;
826 }
827 if (!err)
828 err = Grow_restart(st, &info, fdlist, bestcnt, backup_file);
829 while (i>0) {
830 i--;
831 if (fdlist[i]>=0) close(fdlist[i]);
832 }
833 if (err) {
834 fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
835 if (must_close) close(mdfd);
836 return err;
837 }
838 }
839 #endif
840 /* count number of in-sync devices according to the superblock.
841 * We must have this number to start the array without -s or -R
842 */
843 req_cnt = info.array.working_disks;
844
845 /* Almost ready to actually *do* something */
846 if (!old_linux) {
847 int rv;
848 if ((vers % 100) >= 1) { /* can use different versions */
849 mdu_array_info_t inf;
850 memset(&inf, 0, sizeof(inf));
851 inf.major_version = st->ss->major;
852 inf.minor_version = st->minor_version;
853 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
854 } else
855 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
856
857 if (rv) {
858 fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
859 mddev, strerror(errno));
860 if (must_close) close(mdfd);
861 return 1;
862 }
863 if (ident->bitmap_fd >= 0) {
864 if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
865 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
866 if (must_close) close(mdfd);
867 return 1;
868 }
869 } else if (ident->bitmap_file) {
870 /* From config file */
871 int bmfd = open(ident->bitmap_file, O_RDWR);
872 if (bmfd < 0) {
873 fprintf(stderr, Name ": Could not open bitmap file %s\n",
874 ident->bitmap_file);
875 if (must_close) close(mdfd);
876 return 1;
877 }
878 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
879 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
880 close(bmfd);
881 if (must_close) close(mdfd);
882 return 1;
883 }
884 close(bmfd);
885 }
886
887 /* First, add the raid disks, but add the chosen one last */
888 for (i=0; i<= bestcnt; i++) {
889 int j;
890 if (i < bestcnt) {
891 j = best[i];
892 if (j == chosen_drive)
893 continue;
894 } else
895 j = chosen_drive;
896
897 if (j >= 0 /* && devices[j].uptodate */) {
898 if (ioctl(mdfd, ADD_NEW_DISK,
899 &devices[j].i.disk)!=0) {
900 fprintf(stderr, Name ": failed to add "
901 "%s to %s: %s\n",
902 devices[j].devname,
903 mddev,
904 strerror(errno));
905 if (i < info.array.raid_disks
906 || i == bestcnt)
907 okcnt--;
908 else
909 sparecnt--;
910 } else if (verbose > 0)
911 fprintf(stderr, Name ": added %s "
912 "to %s as %d\n",
913 devices[j].devname, mddev,
914 devices[j].i.disk.raid_disk);
915 } else if (verbose > 0 && i < info.array.raid_disks)
916 fprintf(stderr, Name ": no uptodate device for "
917 "slot %d of %s\n",
918 i, mddev);
919 }
920
921 if (runstop == 1 ||
922 (runstop <= 0 &&
923 ( enough(info.array.level, info.array.raid_disks,
924 info.array.layout, clean, avail, okcnt) &&
925 (okcnt >= req_cnt || start_partial_ok)
926 ))) {
927 if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
928 if (verbose >= 0) {
929 fprintf(stderr, Name ": %s has been started with %d drive%s",
930 mddev, okcnt, okcnt==1?"":"s");
931 if (okcnt < info.array.raid_disks)
932 fprintf(stderr, " (out of %d)", info.array.raid_disks);
933 if (sparecnt)
934 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
935 fprintf(stderr, ".\n");
936 }
937 if (info.reshape_active &&
938 info.array.level >= 4 &&
939 info.array.level <= 6) {
940 /* might need to increase the size
941 * of the stripe cache - default is 256
942 */
943 if (256 < 4 * (info.array.chunk_size/4096)) {
944 struct mdinfo *sra = sysfs_read(mdfd, 0, 0);
945 if (sra)
946 sysfs_set_num(sra, NULL,
947 "stripe_cache_size",
948 (4 * info.array.chunk_size / 4096) + 1);
949 }
950 }
951 if (must_close) {
952 int usecs = 1;
953 close(mdfd);
954 /* There is a nasty race with 'mdadm --monitor'.
955 * If it opens this device before we close it,
956 * it gets an incomplete open on which IO
957 * doesn't work and the capacity if wrong.
958 * If we reopen (to check for layered devices)
959 * before --monitor closes, we loose.
960 *
961 * So: wait upto 1 second for there to be
962 * a non-zero capacity.
963 */
964 while (usecs < 1000) {
965 mdfd = open(mddev, O_RDONLY);
966 if (mdfd >= 0) {
967 unsigned long long size;
968 if (get_dev_size(mdfd, NULL, &size) &&
969 size > 0)
970 break;
971 close(mdfd);
972 }
973 usleep(usecs);
974 usecs <<= 1;
975 }
976 }
977 return 0;
978 }
979 fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
980 mddev, strerror(errno));
981
982 if (!enough(info.array.level, info.array.raid_disks,
983 info.array.layout, 1, avail, okcnt))
984 fprintf(stderr, Name ": Not enough devices to "
985 "start the array.\n");
986 else if (!enough(info.array.level,
987 info.array.raid_disks,
988 info.array.layout, clean,
989 avail, okcnt))
990 fprintf(stderr, Name ": Not enough devices to "
991 "start the array while not clean "
992 "- consider --force.\n");
993
994 if (must_close) {
995 ioctl(mdfd, STOP_ARRAY, NULL);
996 close(mdfd);
997 }
998 return 1;
999 }
1000 if (runstop == -1) {
1001 fprintf(stderr, Name ": %s assembled from %d drive%s",
1002 mddev, okcnt, okcnt==1?"":"s");
1003 if (okcnt != info.array.raid_disks)
1004 fprintf(stderr, " (out of %d)", info.array.raid_disks);
1005 fprintf(stderr, ", but not started.\n");
1006 if (must_close) close(mdfd);
1007 return 0;
1008 }
1009 if (verbose >= -1) {
1010 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
1011 if (sparecnt)
1012 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1013 if (!enough(info.array.level, info.array.raid_disks,
1014 info.array.layout, 1, avail, okcnt))
1015 fprintf(stderr, " - not enough to start the array.\n");
1016 else if (!enough(info.array.level,
1017 info.array.raid_disks,
1018 info.array.layout, clean,
1019 avail, okcnt))
1020 fprintf(stderr, " - not enough to start the "
1021 "array while not clean - consider "
1022 "--force.\n");
1023 else {
1024 if (req_cnt == info.array.raid_disks)
1025 fprintf(stderr, " - need all %d to start it", req_cnt);
1026 else
1027 fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
1028 fprintf(stderr, " (use --run to insist).\n");
1029 }
1030 }
1031 if (must_close) {
1032 ioctl(mdfd, STOP_ARRAY, NULL);
1033 close(mdfd);
1034 }
1035 return 1;
1036 } else {
1037 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1038 * been updated to point to the current locations of devices.
1039 * so we can just start the array
1040 */
1041 unsigned long dev;
1042 dev = makedev(devices[chosen_drive].i.disk.major,
1043 devices[chosen_drive].i.disk.minor);
1044 if (ioctl(mdfd, START_ARRAY, dev)) {
1045 fprintf(stderr, Name ": Cannot start array: %s\n",
1046 strerror(errno));
1047 }
1048
1049 }
1050 if (must_close) close(mdfd);
1051 return 0;
1052 }
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