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Assemble: call remove_partitions later.
[thirdparty/mdadm.git] / Assemble.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@suse.de>
23 */
24
25 #include "mdadm.h"
26 #include <ctype.h>
27
28 static int name_matches(char *found, char *required, char *homehost)
29 {
30 /* See if the name found matches the required name, possibly
31 * prefixed with 'homehost'
32 */
33 char fnd[33];
34
35 strncpy(fnd, found, 32);
36 fnd[32] = 0;
37 if (strcmp(found, required)==0)
38 return 1;
39 if (homehost) {
40 int l = strlen(homehost);
41 if (l < 32 && fnd[l] == ':' &&
42 strcmp(fnd+l+1, required)==0)
43 return 1;
44 }
45 return 0;
46 }
47
48 static int is_member_busy(char *metadata_version)
49 {
50 /* check if the given member array is active */
51 struct mdstat_ent *mdstat = mdstat_read(1, 0);
52 struct mdstat_ent *ent;
53 int busy = 0;
54
55 for (ent = mdstat; ent; ent = ent->next) {
56 if (ent->metadata_version == NULL)
57 continue;
58 if (strncmp(ent->metadata_version, "external:", 9) != 0)
59 continue;
60 if (!is_subarray(&ent->metadata_version[9]))
61 continue;
62 /* Skip first char - it can be '/' or '-' */
63 if (strcmp(&ent->metadata_version[10], metadata_version+1) == 0) {
64 busy = 1;
65 break;
66 }
67 }
68 free_mdstat(mdstat);
69
70 return busy;
71 }
72
73 int Assemble(struct supertype *st, char *mddev,
74 mddev_ident_t ident,
75 mddev_dev_t devlist, char *backup_file,
76 int readonly, int runstop,
77 char *update, char *homehost, int require_homehost,
78 int verbose, int force)
79 {
80 /*
81 * The task of Assemble is to find a collection of
82 * devices that should (according to their superblocks)
83 * form an array, and to give this collection to the MD driver.
84 * In Linux-2.4 and later, this involves submitting a
85 * SET_ARRAY_INFO ioctl with no arg - to prepare
86 * the array - and then submit a number of
87 * ADD_NEW_DISK ioctls to add disks into
88 * the array. Finally RUN_ARRAY might
89 * be submitted to start the array.
90 *
91 * Much of the work of Assemble is in finding and/or
92 * checking the disks to make sure they look right.
93 *
94 * If mddev is not set, then scan must be set and we
95 * read through the config file for dev+uuid mapping
96 * We recurse, setting mddev, for each device that
97 * - isn't running
98 * - has a valid uuid (or any uuid if !uuidset)
99 *
100 * If mddev is set, we try to determine state of md.
101 * check version - must be at least 0.90.0
102 * check kernel version. must be at least 2.4.
103 * If not, we can possibly fall back on START_ARRAY
104 * Try to GET_ARRAY_INFO.
105 * If possible, give up
106 * If not, try to STOP_ARRAY just to make sure
107 *
108 * If !uuidset and scan, look in conf-file for uuid
109 * If not found, give up
110 * If !devlist and scan and uuidset, get list of devs from conf-file
111 *
112 * For each device:
113 * Check superblock - discard if bad
114 * Check uuid (set if we don't have one) - discard if no match
115 * Check superblock similarity if we have a superblock - discard if different
116 * Record events, devicenum
117 * This should give us a list of devices for the array
118 * We should collect the most recent event number
119 *
120 * Count disks with recent enough event count
121 * While force && !enough disks
122 * Choose newest rejected disks, update event count
123 * mark clean and rewrite superblock
124 * If recent kernel:
125 * SET_ARRAY_INFO
126 * foreach device with recent events : ADD_NEW_DISK
127 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
128 * If old kernel:
129 * Check the device numbers in superblock are right
130 * update superblock if any changes
131 * START_ARRAY
132 *
133 */
134 int mdfd;
135 int clean;
136 int auto_assem = (mddev == NULL && !ident->uuid_set &&
137 ident->super_minor == UnSet && ident->name[0] == 0
138 && (ident->container == NULL || ident->member == NULL));
139 int old_linux = 0;
140 int vers = vers; /* Keep gcc quite - it really is initialised */
141 struct {
142 char *devname;
143 int uptodate; /* set once we decide that this device is as
144 * recent as everything else in the array.
145 */
146 struct mdinfo i;
147 } *devices;
148 int *best = NULL; /* indexed by raid_disk */
149 int bestcnt = 0;
150 int devcnt = 0;
151 unsigned int okcnt, sparecnt, rebuilding_cnt;
152 unsigned int req_cnt;
153 int i;
154 int most_recent = 0;
155 int chosen_drive;
156 int change = 0;
157 int inargv = 0;
158 int report_missmatch;
159 int bitmap_done;
160 int start_partial_ok = (runstop >= 0) &&
161 (force || devlist==NULL || auto_assem);
162 unsigned int num_devs;
163 mddev_dev_t tmpdev;
164 struct mdinfo info;
165 struct mdinfo *content = NULL;
166 char *avail;
167 int nextspare = 0;
168 char *name = NULL;
169 int trustworthy;
170 char chosen_name[1024];
171
172 if (get_linux_version() < 2004000)
173 old_linux = 1;
174
175 /*
176 * If any subdevs are listed, then any that don't
177 * match ident are discarded. Remainder must all match and
178 * become the array.
179 * If no subdevs, then we scan all devices in the config file, but
180 * there must be something in the identity
181 */
182
183 if (!devlist &&
184 ident->uuid_set == 0 &&
185 (ident->super_minor < 0 || ident->super_minor == UnSet) &&
186 ident->name[0] == 0 &&
187 (ident->container == NULL || ident->member == NULL) &&
188 ident->devices == NULL) {
189 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
190 mddev ? mddev : "further assembly");
191 return 1;
192 }
193
194 if (devlist == NULL)
195 devlist = conf_get_devs();
196 else if (mddev)
197 inargv = 1;
198
199 report_missmatch = ((inargv && verbose >= 0) || verbose > 0);
200 try_again:
201 /* We come back here when doing auto-assembly and attempting some
202 * set of devices failed. Those are now marked as ->used==2 and
203 * we ignore them and try again
204 */
205
206 tmpdev = devlist; num_devs = 0;
207 while (tmpdev) {
208 if (tmpdev->used)
209 tmpdev->used = 2;
210 else
211 num_devs++;
212 tmpdev = tmpdev->next;
213 }
214 devices = malloc(num_devs * sizeof(*devices));
215
216 if (!st && ident->st) st = ident->st;
217
218 if (verbose>0)
219 fprintf(stderr, Name ": looking for devices for %s\n",
220 mddev ? mddev : "further assembly");
221
222 /* first walk the list of devices to find a consistent set
223 * that match the criterea, if that is possible.
224 * We flag the ones we like with 'used'.
225 */
226 for (tmpdev = devlist;
227 tmpdev;
228 tmpdev = tmpdev->next) {
229 char *devname = tmpdev->devname;
230 int dfd;
231 struct stat stb;
232 struct supertype *tst = dup_super(st);
233
234 if (tmpdev->used > 1) continue;
235
236 if (ident->devices &&
237 !match_oneof(ident->devices, devname)) {
238 if (report_missmatch)
239 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
240 continue;
241 }
242
243 dfd = dev_open(devname, O_RDONLY|O_EXCL);
244 if (dfd < 0) {
245 if (report_missmatch)
246 fprintf(stderr, Name ": cannot open device %s: %s\n",
247 devname, strerror(errno));
248 tmpdev->used = 2;
249 } else if (fstat(dfd, &stb)< 0) {
250 /* Impossible! */
251 fprintf(stderr, Name ": fstat failed for %s: %s\n",
252 devname, strerror(errno));
253 tmpdev->used = 2;
254 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
255 fprintf(stderr, Name ": %s is not a block device.\n",
256 devname);
257 tmpdev->used = 2;
258 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
259 if (report_missmatch)
260 fprintf(stderr, Name ": no recogniseable superblock on %s\n",
261 devname);
262 tmpdev->used = 2;
263 } else if (tst->ss->load_super(tst,dfd, NULL)) {
264 if (report_missmatch)
265 fprintf( stderr, Name ": no RAID superblock on %s\n",
266 devname);
267 } else if (auto_assem && st == NULL &&
268 !conf_test_metadata(tst->ss->name,
269 tst->ss->match_home(tst, homehost) == 1)) {
270 if (report_missmatch)
271 fprintf(stderr, Name ": %s has metadata type %s for which "
272 "auto-assembly is disabled\n",
273 devname, tst->ss->name);
274 tst->ss->free_super(tst);
275 tmpdev->used = 2;
276 } else {
277 content = &info;
278 memset(content, 0, sizeof(*content));
279 tst->ss->getinfo_super(tst, content);
280 }
281 if (dfd >= 0) close(dfd);
282
283 if (tst && tst->sb && tst->ss->container_content
284 && tst->loaded_container) {
285 /* tmpdev is a container. We need to be either
286 * looking for a member, or auto-assembling
287 */
288 if (st) {
289 /* already found some components, this cannot
290 * be another one.
291 */
292 if (report_missmatch)
293 fprintf(stderr, Name ": %s is a container, but we are looking for components\n",
294 devname);
295 goto loop;
296 }
297
298 if (ident->container) {
299 if (ident->container[0] == '/' &&
300 !same_dev(ident->container, devname)) {
301 if (report_missmatch)
302 fprintf(stderr, Name ": %s is not the container required (%s)\n",
303 devname, ident->container);
304 goto loop;
305 }
306 if (ident->container[0] != '/') {
307 /* we have a uuid */
308 int uuid[4];
309 if (!parse_uuid(ident->container, uuid) ||
310 !same_uuid(content->uuid, uuid, tst->ss->swapuuid)) {
311 if (report_missmatch)
312 fprintf(stderr, Name ": %s has wrong UUID to be required container\n",
313 devname);
314 goto loop;
315 }
316 }
317 }
318 /* It is worth looking inside this container.
319 */
320 if (verbose > 0)
321 fprintf(stderr, Name ": looking in container %s\n",
322 devname);
323 next_member:
324 if (tmpdev->content)
325 content = tmpdev->content;
326 else
327 content = tst->ss->container_content(tst);
328 if (!content)
329 goto loop; /* empty container */
330
331 tmpdev->content = content->next;
332 if (tmpdev->content == NULL)
333 tmpdev->used = 2;
334
335 } else if (ident->container || ident->member) {
336 /* No chance of this matching if we don't have
337 * a container */
338 if (report_missmatch)
339 fprintf(stderr, Name "%s is not a container, and one is required.\n",
340 devname);
341 goto loop;
342 }
343
344 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
345 (!tst || !tst->sb ||
346 same_uuid(content->uuid, ident->uuid, tst->ss->swapuuid)==0)) {
347 if (report_missmatch)
348 fprintf(stderr, Name ": %s has wrong uuid.\n",
349 devname);
350 goto loop;
351 }
352 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
353 (!tst || !tst->sb ||
354 name_matches(content->name, ident->name, homehost)==0)) {
355 if (report_missmatch)
356 fprintf(stderr, Name ": %s has wrong name.\n",
357 devname);
358 goto loop;
359 }
360 if (ident->super_minor != UnSet &&
361 (!tst || !tst->sb ||
362 ident->super_minor != content->array.md_minor)) {
363 if (report_missmatch)
364 fprintf(stderr, Name ": %s has wrong super-minor.\n",
365 devname);
366 goto loop;
367 }
368 if (ident->level != UnSet &&
369 (!tst || !tst->sb ||
370 ident->level != content->array.level)) {
371 if (report_missmatch)
372 fprintf(stderr, Name ": %s has wrong raid level.\n",
373 devname);
374 goto loop;
375 }
376 if (ident->raid_disks != UnSet &&
377 (!tst || !tst->sb ||
378 ident->raid_disks!= content->array.raid_disks)) {
379 if (report_missmatch)
380 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
381 devname);
382 goto loop;
383 }
384 if (auto_assem) {
385 if (tst == NULL || tst->sb == NULL)
386 continue;
387 }
388 /* If we are this far, then we are nearly commited to this device.
389 * If the super_block doesn't exist, or doesn't match others,
390 * then we probably cannot continue
391 * However if one of the arrays is for the homehost, and
392 * the other isn't that can disambiguate.
393 */
394
395 if (!tst || !tst->sb) {
396 fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
397 devname);
398 if (st)
399 st->ss->free_super(st);
400 return 1;
401 }
402
403 if (tst && tst->sb && tst->ss->container_content
404 && tst->loaded_container) {
405 /* we have the one container we need, don't keep
406 * looking. If the chosen member is active, skip.
407 */
408 if (is_member_busy(content->text_version)) {
409 if (report_missmatch)
410 fprintf(stderr, Name ": member %s in %s is already assembled\n",
411 content->text_version,
412 devname);
413 skip:
414 if (tmpdev->content)
415 goto next_member;
416 tst->ss->free_super(tst);
417 tst = NULL;
418 content = NULL;
419 if (auto_assem)
420 goto loop;
421 return 1;
422 }
423 if (ident->member && ident->member[0]) {
424 char *s = strchr(content->text_version+1, '/');
425 if (s == NULL) {
426 fprintf(stderr, Name ": badly formatted version: %s\n",
427 content->text_version);
428 goto skip;
429 }
430 if (strcmp(ident->member, s+1) != 0) {
431 if (report_missmatch)
432 fprintf(stderr,
433 Name ": skipping wrong member %s\n",
434 content->text_version);
435 goto skip;
436 }
437 }
438 st = tst; tst = NULL;
439 if (!auto_assem && inargv && tmpdev->next != NULL) {
440 fprintf(stderr, Name ": %s is a container, but is not "
441 "only device given: confused and aborting\n",
442 devname);
443 st->ss->free_super(st);
444 return 1;
445 }
446 if (verbose > 0)
447 fprintf(stderr, Name ": found match on member %s in %s\n",
448 content->text_version, devname);
449 break;
450 }
451 if (st == NULL)
452 st = dup_super(tst);
453 if (st->minor_version == -1)
454 st->minor_version = tst->minor_version;
455 if (st->ss != tst->ss ||
456 st->minor_version != tst->minor_version ||
457 st->ss->compare_super(st, tst) != 0) {
458 /* Some mismatch. If exactly one array matches this host,
459 * we can resolve on that one.
460 * Or, if we are auto assembling, we just ignore the second
461 * for now.
462 */
463 if (auto_assem)
464 goto loop;
465 if (homehost) {
466 int first = st->ss->match_home(st, homehost);
467 int last = tst->ss->match_home(tst, homehost);
468 if (first != last &&
469 (first == 1 || last == 1)) {
470 /* We can do something */
471 if (first) {/* just ignore this one */
472 if (report_missmatch)
473 fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
474 devname);
475 goto loop;
476 } else { /* reject all those sofar */
477 mddev_dev_t td;
478 if (report_missmatch)
479 fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n",
480 devname);
481 for (td=devlist; td != tmpdev; td=td->next)
482 if (td->used == 1)
483 td->used = 0;
484 tmpdev->used = 1;
485 goto loop;
486 }
487 }
488 }
489 fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
490 devname);
491 tst->ss->free_super(tst);
492 st->ss->free_super(st);
493 return 1;
494 }
495
496 tmpdev->used = 1;
497
498 loop:
499 if (tmpdev->content)
500 goto next_member;
501 if (tst)
502 tst->ss->free_super(tst);
503 }
504
505 if (!st || !st->sb || !content)
506 return 2;
507
508 /* Now need to open the array device. Use create_mddev */
509 if (content == &info)
510 st->ss->getinfo_super(st, content);
511
512 trustworthy = FOREIGN;
513 name = content->name;
514 switch (st->ss->match_home(st, homehost)
515 ?: st->ss->match_home(st, "any")) {
516 case 1:
517 trustworthy = LOCAL;
518 name = strchr(content->name, ':');
519 if (name)
520 name++;
521 else
522 name = content->name;
523 break;
524 }
525 if (!auto_assem)
526 /* If the array is listed in mdadm.conf or on
527 * command line, then we trust the name
528 * even if the array doesn't look local
529 */
530 trustworthy = LOCAL;
531
532 if (name[0] == 0 &&
533 content->array.level == LEVEL_CONTAINER) {
534 name = content->text_version;
535 trustworthy = METADATA;
536 }
537
538 if (name[0] && trustworthy != LOCAL &&
539 ! require_homehost &&
540 conf_name_is_free(name))
541 trustworthy = LOCAL;
542
543 if (trustworthy == LOCAL &&
544 strchr(name, ':'))
545 /* Ignore 'host:' prefix of name */
546 name = strchr(name, ':')+1;
547
548 mdfd = create_mddev(mddev, name, ident->autof, trustworthy,
549 chosen_name);
550 if (mdfd < 0) {
551 st->ss->free_super(st);
552 free(devices);
553 if (auto_assem)
554 goto try_again;
555 return 1;
556 }
557 mddev = chosen_name;
558 vers = md_get_version(mdfd);
559 if (vers < 9000) {
560 fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
561 " Upgrade your kernel or try --build\n");
562 close(mdfd);
563 return 1;
564 }
565 if (mddev_busy(fd2devnum(mdfd))) {
566 fprintf(stderr, Name ": %s already active, cannot restart it!\n",
567 mddev);
568 for (tmpdev = devlist ;
569 tmpdev && tmpdev->used != 1;
570 tmpdev = tmpdev->next)
571 ;
572 if (tmpdev && auto_assem)
573 fprintf(stderr, Name ": %s needed for %s...\n",
574 mddev, tmpdev->devname);
575 close(mdfd);
576 mdfd = -3;
577 st->ss->free_super(st);
578 free(devices);
579 if (auto_assem)
580 goto try_again;
581 return 1;
582 }
583 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
584
585 #ifndef MDASSEMBLE
586 if (content != &info) {
587 /* This is a member of a container. Try starting the array. */
588 return assemble_container_content(st, mdfd, content, runstop,
589 chosen_name, verbose);
590 }
591 #endif
592 /* Ok, no bad inconsistancy, we can try updating etc */
593 bitmap_done = 0;
594 content->update_private = NULL;
595 for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
596 char *devname = tmpdev->devname;
597 struct stat stb;
598 /* looks like a good enough match to update the super block if needed */
599 #ifndef MDASSEMBLE
600 if (update) {
601 int dfd;
602 /* prepare useful information in info structures */
603 struct stat stb2;
604 struct supertype *tst;
605 fstat(mdfd, &stb2);
606
607 if (strcmp(update, "uuid")==0 &&
608 !ident->uuid_set) {
609 int rfd;
610 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
611 read(rfd, ident->uuid, 16) != 16) {
612 *(__u32*)(ident->uuid) = random();
613 *(__u32*)(ident->uuid+1) = random();
614 *(__u32*)(ident->uuid+2) = random();
615 *(__u32*)(ident->uuid+3) = random();
616 }
617 if (rfd >= 0) close(rfd);
618 }
619 dfd = dev_open(devname, O_RDWR|O_EXCL);
620
621 tst = dup_super(st);
622 if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
623 fprintf(stderr, Name ": cannot re-read metadata from %s - aborting\n",
624 devname);
625 if (dfd >= 0)
626 close(dfd);
627 close(mdfd);
628 return 1;
629 }
630 tst->ss->getinfo_super(tst, content);
631
632 memcpy(content->uuid, ident->uuid, 16);
633 strcpy(content->name, ident->name);
634 content->array.md_minor = minor(stb2.st_rdev);
635
636 tst->ss->update_super(tst, content, update,
637 devname, verbose,
638 ident->uuid_set, homehost);
639 if (strcmp(update, "uuid")==0 &&
640 !ident->uuid_set) {
641 ident->uuid_set = 1;
642 memcpy(ident->uuid, content->uuid, 16);
643 }
644 if (dfd < 0)
645 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
646 devname);
647 else if (tst->ss->store_super(tst, dfd))
648 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
649 devname);
650 if (dfd >= 0)
651 close(dfd);
652
653 if (strcmp(update, "uuid")==0 &&
654 ident->bitmap_fd >= 0 && !bitmap_done) {
655 if (bitmap_update_uuid(ident->bitmap_fd,
656 content->uuid,
657 tst->ss->swapuuid) != 0)
658 fprintf(stderr, Name ": Could not update uuid on external bitmap.\n");
659 else
660 bitmap_done = 1;
661 }
662 tst->ss->free_super(tst);
663 } else
664 #endif
665 {
666 struct supertype *tst = dup_super(st);
667 int dfd;
668 dfd = dev_open(devname, O_RDWR|O_EXCL);
669
670 if (dfd < 0 || tst->ss->load_super(tst, dfd, NULL) != 0) {
671 fprintf(stderr, Name ": cannot re-read metadata from %s - aborting\n",
672 devname);
673 if (dfd >= 0)
674 close(dfd);
675 close(mdfd);
676 return 1;
677 }
678 tst->ss->getinfo_super(tst, content);
679 tst->ss->free_super(tst);
680 close(dfd);
681 }
682
683 stat(devname, &stb);
684
685 if (verbose > 0)
686 fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
687 devname, mddev, content->disk.raid_disk);
688 devices[devcnt].devname = devname;
689 devices[devcnt].uptodate = 0;
690 devices[devcnt].i = *content;
691 devices[devcnt].i.disk.major = major(stb.st_rdev);
692 devices[devcnt].i.disk.minor = minor(stb.st_rdev);
693 if (most_recent < devcnt) {
694 if (devices[devcnt].i.events
695 > devices[most_recent].i.events)
696 most_recent = devcnt;
697 }
698 if (content->array.level == LEVEL_MULTIPATH)
699 /* with multipath, the raid_disk from the superblock is meaningless */
700 i = devcnt;
701 else
702 i = devices[devcnt].i.disk.raid_disk;
703 if (i+1 == 0) {
704 if (nextspare < content->array.raid_disks)
705 nextspare = content->array.raid_disks;
706 i = nextspare++;
707 } else {
708 if (i >= content->array.raid_disks &&
709 i >= nextspare)
710 nextspare = i+1;
711 }
712 if (i < 10000) {
713 if (i >= bestcnt) {
714 int newbestcnt = i+10;
715 int *newbest = malloc(sizeof(int)*newbestcnt);
716 int c;
717 for (c=0; c < newbestcnt; c++)
718 if (c < bestcnt)
719 newbest[c] = best[c];
720 else
721 newbest[c] = -1;
722 if (best)free(best);
723 best = newbest;
724 bestcnt = newbestcnt;
725 }
726 if (best[i] >=0 &&
727 devices[best[i]].i.events
728 == devices[devcnt].i.events
729 && (devices[best[i]].i.disk.minor
730 != devices[devcnt].i.disk.minor)
731 && st->ss == &super0
732 && content->array.level != LEVEL_MULTIPATH) {
733 /* two different devices with identical superblock.
734 * Could be a mis-detection caused by overlapping
735 * partitions. fail-safe.
736 */
737 fprintf(stderr, Name ": WARNING %s and %s appear"
738 " to have very similar superblocks.\n"
739 " If they are really different, "
740 "please --zero the superblock on one\n"
741 " If they are the same or overlap,"
742 " please remove one from %s.\n",
743 devices[best[i]].devname, devname,
744 inargv ? "the list" :
745 "the\n DEVICE list in mdadm.conf"
746 );
747 close(mdfd);
748 return 1;
749 }
750 if (best[i] == -1
751 || (devices[best[i]].i.events
752 < devices[devcnt].i.events))
753 best[i] = devcnt;
754 }
755 devcnt++;
756 }
757 free(content->update_private);
758 content->update_private = NULL;
759
760 if (devcnt == 0) {
761 fprintf(stderr, Name ": no devices found for %s\n",
762 mddev);
763 if (st)
764 st->ss->free_super(st);
765 close(mdfd);
766 return 1;
767 }
768
769 if (update && strcmp(update, "byteorder")==0)
770 st->minor_version = 90;
771
772 st->ss->getinfo_super(st, content);
773 clean = content->array.state & 1;
774
775 /* now we have some devices that might be suitable.
776 * I wonder how many
777 */
778 avail = malloc(content->array.raid_disks);
779 memset(avail, 0, content->array.raid_disks);
780 okcnt = 0;
781 sparecnt=0;
782 rebuilding_cnt=0;
783 for (i=0; i< bestcnt; i++) {
784 int j = best[i];
785 int event_margin = 1; /* always allow a difference of '1'
786 * like the kernel does
787 */
788 if (j < 0) continue;
789 /* note: we ignore error flags in multipath arrays
790 * as they don't make sense
791 */
792 if (content->array.level != LEVEL_MULTIPATH)
793 if (!(devices[j].i.disk.state & (1<<MD_DISK_ACTIVE))) {
794 if (!(devices[j].i.disk.state
795 & (1<<MD_DISK_FAULTY)))
796 sparecnt++;
797 continue;
798 }
799 if (devices[j].i.events+event_margin >=
800 devices[most_recent].i.events) {
801 devices[j].uptodate = 1;
802 if (i < content->array.raid_disks) {
803 if (devices[j].i.recovery_start == MaxSector) {
804 okcnt++;
805 avail[i]=1;
806 } else
807 rebuilding_cnt++;
808 } else
809 sparecnt++;
810 }
811 }
812 while (force && !enough(content->array.level, content->array.raid_disks,
813 content->array.layout, 1,
814 avail, okcnt)) {
815 /* Choose the newest best drive which is
816 * not up-to-date, update the superblock
817 * and add it.
818 */
819 int fd;
820 struct supertype *tst;
821 unsigned long long current_events;
822 chosen_drive = -1;
823 for (i = 0; i < content->array.raid_disks && i < bestcnt; i++) {
824 int j = best[i];
825 if (j>=0 &&
826 !devices[j].uptodate &&
827 devices[j].i.recovery_start == MaxSector &&
828 (chosen_drive < 0 ||
829 devices[j].i.events
830 > devices[chosen_drive].i.events))
831 chosen_drive = j;
832 }
833 if (chosen_drive < 0)
834 break;
835 current_events = devices[chosen_drive].i.events;
836 add_another:
837 if (verbose >= 0)
838 fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
839 devices[chosen_drive].devname,
840 devices[chosen_drive].i.disk.raid_disk,
841 (int)(devices[chosen_drive].i.events),
842 (int)(devices[most_recent].i.events));
843 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
844 if (fd < 0) {
845 fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
846 devices[chosen_drive].devname);
847 devices[chosen_drive].i.events = 0;
848 continue;
849 }
850 tst = dup_super(st);
851 if (tst->ss->load_super(tst,fd, NULL)) {
852 close(fd);
853 fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
854 devices[chosen_drive].devname);
855 devices[chosen_drive].i.events = 0;
856 continue;
857 }
858 content->events = devices[most_recent].i.events;
859 tst->ss->update_super(tst, content, "force-one",
860 devices[chosen_drive].devname, verbose,
861 0, NULL);
862
863 if (tst->ss->store_super(tst, fd)) {
864 close(fd);
865 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
866 devices[chosen_drive].devname);
867 devices[chosen_drive].i.events = 0;
868 tst->ss->free_super(tst);
869 continue;
870 }
871 close(fd);
872 devices[chosen_drive].i.events = devices[most_recent].i.events;
873 devices[chosen_drive].uptodate = 1;
874 avail[chosen_drive] = 1;
875 okcnt++;
876 tst->ss->free_super(tst);
877
878 /* If there are any other drives of the same vintage,
879 * add them in as well. We can't lose and we might gain
880 */
881 for (i = 0; i < content->array.raid_disks && i < bestcnt ; i++) {
882 int j = best[i];
883 if (j >= 0 &&
884 !devices[j].uptodate &&
885 devices[j].i.events == current_events) {
886 chosen_drive = j;
887 goto add_another;
888 }
889 }
890 }
891
892 /* Now we want to look at the superblock which the kernel will base things on
893 * and compare the devices that we think are working with the devices that the
894 * superblock thinks are working.
895 * If there are differences and --force is given, then update this chosen
896 * superblock.
897 */
898 chosen_drive = -1;
899 st->ss->free_super(st);
900 for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
901 int j = best[i];
902 int fd;
903
904 if (j<0)
905 continue;
906 if (!devices[j].uptodate)
907 continue;
908 chosen_drive = j;
909 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
910 fprintf(stderr, Name ": Cannot open %s: %s\n",
911 devices[j].devname, strerror(errno));
912 close(mdfd);
913 return 1;
914 }
915 if (st->ss->load_super(st,fd, NULL)) {
916 close(fd);
917 fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
918 devices[j].devname);
919 close(mdfd);
920 return 1;
921 }
922 close(fd);
923 }
924 if (st->sb == NULL) {
925 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
926 close(mdfd);
927 return 1;
928 }
929 st->ss->getinfo_super(st, content);
930 #ifndef MDASSEMBLE
931 sysfs_init(content, mdfd, 0);
932 #endif
933 for (i=0; i<bestcnt; i++) {
934 int j = best[i];
935 unsigned int desired_state;
936
937 if (i < content->array.raid_disks)
938 desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
939 else
940 desired_state = 0;
941
942 if (j<0)
943 continue;
944 if (!devices[j].uptodate)
945 continue;
946
947 devices[j].i.disk.state = desired_state;
948 if (!(devices[j].i.array.state & 1))
949 clean = 0;
950
951 if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
952 verbose, 0, NULL)) {
953 if (force) {
954 if (verbose >= 0)
955 fprintf(stderr, Name ": "
956 "clearing FAULTY flag for device %d in %s for %s\n",
957 j, mddev, devices[j].devname);
958 change = 1;
959 } else {
960 if (verbose >= -1)
961 fprintf(stderr, Name ": "
962 "device %d in %s has wrong state in superblock, but %s seems ok\n",
963 i, mddev, devices[j].devname);
964 }
965 }
966 #if 0
967 if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
968 fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
969 i, mddev);
970 }
971 #endif
972 }
973 if (force && !clean &&
974 !enough(content->array.level, content->array.raid_disks,
975 content->array.layout, clean,
976 avail, okcnt)) {
977 change += st->ss->update_super(st, content, "force-array",
978 devices[chosen_drive].devname, verbose,
979 0, NULL);
980 clean = 1;
981 }
982
983 if (change) {
984 int fd;
985 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
986 if (fd < 0) {
987 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
988 devices[chosen_drive].devname);
989 close(mdfd);
990 return 1;
991 }
992 if (st->ss->store_super(st, fd)) {
993 close(fd);
994 fprintf(stderr, Name ": Could not re-write superblock on %s\n",
995 devices[chosen_drive].devname);
996 close(mdfd);
997 return 1;
998 }
999 close(fd);
1000 }
1001
1002 /* If we are in the middle of a reshape we may need to restore saved data
1003 * that was moved aside due to the reshape overwriting live data
1004 * The code of doing this lives in Grow.c
1005 */
1006 #ifndef MDASSEMBLE
1007 if (content->reshape_active) {
1008 int err = 0;
1009 int *fdlist = malloc(sizeof(int)* bestcnt);
1010 if (verbose > 0)
1011 fprintf(stderr, Name ":%s has an active reshape - checking "
1012 "if critical section needs to be restored\n",
1013 chosen_name);
1014 for (i=0; i<bestcnt; i++) {
1015 int j = best[i];
1016 if (j >= 0) {
1017 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
1018 if (fdlist[i] < 0) {
1019 fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
1020 devices[j].devname);
1021 err = 1;
1022 break;
1023 }
1024 } else
1025 fdlist[i] = -1;
1026 }
1027 if (!err)
1028 err = Grow_restart(st, content, fdlist, bestcnt, backup_file, verbose > 0);
1029 while (i>0) {
1030 i--;
1031 if (fdlist[i]>=0) close(fdlist[i]);
1032 }
1033 if (err) {
1034 fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
1035 if (backup_file == NULL)
1036 fprintf(stderr," Possibly you needed to specify the --backup-file\n");
1037 close(mdfd);
1038 return err;
1039 }
1040 }
1041 #endif
1042 /* count number of in-sync devices according to the superblock.
1043 * We must have this number to start the array without -s or -R
1044 */
1045 req_cnt = content->array.working_disks;
1046
1047 /* Almost ready to actually *do* something */
1048 if (!old_linux) {
1049 int rv;
1050
1051 /* First, fill in the map, so that udev can find our name
1052 * as soon as we become active.
1053 */
1054 map_update(NULL, fd2devnum(mdfd), content->text_version,
1055 content->uuid, chosen_name);
1056
1057 rv = set_array_info(mdfd, st, content);
1058 if (rv) {
1059 fprintf(stderr, Name ": failed to set array info for %s: %s\n",
1060 mddev, strerror(errno));
1061 ioctl(mdfd, STOP_ARRAY, NULL);
1062 close(mdfd);
1063 return 1;
1064 }
1065 if (ident->bitmap_fd >= 0) {
1066 if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
1067 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
1068 ioctl(mdfd, STOP_ARRAY, NULL);
1069 close(mdfd);
1070 return 1;
1071 }
1072 } else if (ident->bitmap_file) {
1073 /* From config file */
1074 int bmfd = open(ident->bitmap_file, O_RDWR);
1075 if (bmfd < 0) {
1076 fprintf(stderr, Name ": Could not open bitmap file %s\n",
1077 ident->bitmap_file);
1078 ioctl(mdfd, STOP_ARRAY, NULL);
1079 close(mdfd);
1080 return 1;
1081 }
1082 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
1083 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
1084 close(bmfd);
1085 ioctl(mdfd, STOP_ARRAY, NULL);
1086 close(mdfd);
1087 return 1;
1088 }
1089 close(bmfd);
1090 }
1091
1092 /* First, add the raid disks, but add the chosen one last */
1093 for (i=0; i<= bestcnt; i++) {
1094 int j;
1095 if (i < bestcnt) {
1096 j = best[i];
1097 if (j == chosen_drive)
1098 continue;
1099 } else
1100 j = chosen_drive;
1101
1102 if (j >= 0 /* && devices[j].uptodate */) {
1103 int dfd = dev_open(devices[j].devname,
1104 O_RDWR|O_EXCL);
1105 if (dfd >= 0) {
1106 remove_partitions(dfd);
1107 close(dfd);
1108 }
1109 rv = add_disk(mdfd, st, content, &devices[j].i);
1110
1111 if (rv) {
1112 fprintf(stderr, Name ": failed to add "
1113 "%s to %s: %s\n",
1114 devices[j].devname,
1115 mddev,
1116 strerror(errno));
1117 if (i < content->array.raid_disks
1118 || i == bestcnt)
1119 okcnt--;
1120 else
1121 sparecnt--;
1122 } else if (verbose > 0)
1123 fprintf(stderr, Name ": added %s "
1124 "to %s as %d\n",
1125 devices[j].devname, mddev,
1126 devices[j].i.disk.raid_disk);
1127 } else if (verbose > 0 && i < content->array.raid_disks)
1128 fprintf(stderr, Name ": no uptodate device for "
1129 "slot %d of %s\n",
1130 i, mddev);
1131 }
1132
1133 if (content->array.level == LEVEL_CONTAINER) {
1134 if (verbose >= 0) {
1135 fprintf(stderr, Name ": Container %s has been "
1136 "assembled with %d drive%s",
1137 mddev, okcnt+sparecnt, okcnt+sparecnt==1?"":"s");
1138 if (okcnt < (unsigned)content->array.raid_disks)
1139 fprintf(stderr, " (out of %d)",
1140 content->array.raid_disks);
1141 fprintf(stderr, "\n");
1142 }
1143 sysfs_uevent(content, "change");
1144 wait_for(chosen_name, mdfd);
1145 close(mdfd);
1146 return 0;
1147 }
1148
1149 if (runstop == 1 ||
1150 (runstop <= 0 &&
1151 ( enough(content->array.level, content->array.raid_disks,
1152 content->array.layout, clean, avail, okcnt) &&
1153 (okcnt + rebuilding_cnt >= req_cnt || start_partial_ok)
1154 ))) {
1155 /* This array is good-to-go.
1156 * If a reshape is in progress then we might need to
1157 * continue monitoring it. In that case we start
1158 * it read-only and let the grow code make it writable.
1159 */
1160 int rv;
1161 #ifndef MDASSEMBLE
1162 if (content->reshape_active &&
1163 content->delta_disks <= 0)
1164 rv = Grow_continue(mdfd, st, content, backup_file);
1165 else
1166 #endif
1167 rv = ioctl(mdfd, RUN_ARRAY, NULL);
1168 if (rv == 0) {
1169 if (verbose >= 0) {
1170 fprintf(stderr, Name ": %s has been started with %d drive%s",
1171 mddev, okcnt, okcnt==1?"":"s");
1172 if (okcnt < (unsigned)content->array.raid_disks)
1173 fprintf(stderr, " (out of %d)", content->array.raid_disks);
1174 if (rebuilding_cnt)
1175 fprintf(stderr, "%s %d rebuilding", sparecnt?",":" and", rebuilding_cnt);
1176 if (sparecnt)
1177 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1178 fprintf(stderr, ".\n");
1179 }
1180 if (content->reshape_active &&
1181 content->array.level >= 4 &&
1182 content->array.level <= 6) {
1183 /* might need to increase the size
1184 * of the stripe cache - default is 256
1185 */
1186 if (256 < 4 * (content->array.chunk_size/4096)) {
1187 struct mdinfo *sra = sysfs_read(mdfd, 0, 0);
1188 if (sra)
1189 sysfs_set_num(sra, NULL,
1190 "stripe_cache_size",
1191 (4 * content->array.chunk_size / 4096) + 1);
1192 }
1193 }
1194 wait_for(mddev, mdfd);
1195 close(mdfd);
1196 if (auto_assem) {
1197 int usecs = 1;
1198 /* There is a nasty race with 'mdadm --monitor'.
1199 * If it opens this device before we close it,
1200 * it gets an incomplete open on which IO
1201 * doesn't work and the capacity is
1202 * wrong.
1203 * If we reopen (to check for layered devices)
1204 * before --monitor closes, we loose.
1205 *
1206 * So: wait upto 1 second for there to be
1207 * a non-zero capacity.
1208 */
1209 while (usecs < 1000) {
1210 mdfd = open(mddev, O_RDONLY);
1211 if (mdfd >= 0) {
1212 unsigned long long size;
1213 if (get_dev_size(mdfd, NULL, &size) &&
1214 size > 0)
1215 break;
1216 close(mdfd);
1217 }
1218 usleep(usecs);
1219 usecs <<= 1;
1220 }
1221 }
1222 return 0;
1223 }
1224 fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
1225 mddev, strerror(errno));
1226
1227 if (!enough(content->array.level, content->array.raid_disks,
1228 content->array.layout, 1, avail, okcnt))
1229 fprintf(stderr, Name ": Not enough devices to "
1230 "start the array.\n");
1231 else if (!enough(content->array.level,
1232 content->array.raid_disks,
1233 content->array.layout, clean,
1234 avail, okcnt))
1235 fprintf(stderr, Name ": Not enough devices to "
1236 "start the array while not clean "
1237 "- consider --force.\n");
1238
1239 if (auto_assem)
1240 ioctl(mdfd, STOP_ARRAY, NULL);
1241 close(mdfd);
1242 return 1;
1243 }
1244 if (runstop == -1) {
1245 fprintf(stderr, Name ": %s assembled from %d drive%s",
1246 mddev, okcnt, okcnt==1?"":"s");
1247 if (okcnt != (unsigned)content->array.raid_disks)
1248 fprintf(stderr, " (out of %d)", content->array.raid_disks);
1249 fprintf(stderr, ", but not started.\n");
1250 close(mdfd);
1251 return 0;
1252 }
1253 if (verbose >= -1) {
1254 fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
1255 if (rebuilding_cnt)
1256 fprintf(stderr, "%s %d rebuilding", sparecnt?", ":" and ", rebuilding_cnt);
1257 if (sparecnt)
1258 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1259 if (!enough(content->array.level, content->array.raid_disks,
1260 content->array.layout, 1, avail, okcnt))
1261 fprintf(stderr, " - not enough to start the array.\n");
1262 else if (!enough(content->array.level,
1263 content->array.raid_disks,
1264 content->array.layout, clean,
1265 avail, okcnt))
1266 fprintf(stderr, " - not enough to start the "
1267 "array while not clean - consider "
1268 "--force.\n");
1269 else {
1270 if (req_cnt == (unsigned)content->array.raid_disks)
1271 fprintf(stderr, " - need all %d to start it", req_cnt);
1272 else
1273 fprintf(stderr, " - need %d of %d to start", req_cnt, content->array.raid_disks);
1274 fprintf(stderr, " (use --run to insist).\n");
1275 }
1276 }
1277 if (auto_assem)
1278 ioctl(mdfd, STOP_ARRAY, NULL);
1279 close(mdfd);
1280 return 1;
1281 } else {
1282 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1283 * been updated to point to the current locations of devices.
1284 * so we can just start the array
1285 */
1286 unsigned long dev;
1287 dev = makedev(devices[chosen_drive].i.disk.major,
1288 devices[chosen_drive].i.disk.minor);
1289 if (ioctl(mdfd, START_ARRAY, dev)) {
1290 fprintf(stderr, Name ": Cannot start array: %s\n",
1291 strerror(errno));
1292 }
1293
1294 }
1295 close(mdfd);
1296 return 0;
1297 }
1298
1299 #ifndef MDASSEMBLE
1300 int assemble_container_content(struct supertype *st, int mdfd,
1301 struct mdinfo *content, int runstop,
1302 char *chosen_name, int verbose)
1303 {
1304 struct mdinfo *dev, *sra;
1305 int working = 0, preexist = 0;
1306 struct map_ent *map = NULL;
1307
1308 sysfs_init(content, mdfd, 0);
1309
1310 sra = sysfs_read(mdfd, 0, GET_VERSION);
1311 if (sra == NULL || strcmp(sra->text_version, content->text_version) != 0)
1312 if (sysfs_set_array(content, md_get_version(mdfd)) != 0) {
1313 close(mdfd);
1314 return 1;
1315 }
1316 if (sra)
1317 sysfs_free(sra);
1318
1319 for (dev = content->devs; dev; dev = dev->next)
1320 if (sysfs_add_disk(content, dev, 1) == 0)
1321 working++;
1322 else if (errno == EEXIST)
1323 preexist++;
1324 if (working == 0) {
1325 close(mdfd);
1326 return 1;/* Nothing new, don't try to start */
1327 }
1328
1329 map_update(&map, fd2devnum(mdfd),
1330 content->text_version,
1331 content->uuid, chosen_name);
1332
1333 if (runstop > 0 ||
1334 (working + preexist) >= content->array.working_disks) {
1335 int err;
1336
1337 switch(content->array.level) {
1338 case LEVEL_LINEAR:
1339 case LEVEL_MULTIPATH:
1340 case 0:
1341 err = sysfs_set_str(content, NULL, "array_state",
1342 "active");
1343 break;
1344 default:
1345 err = sysfs_set_str(content, NULL, "array_state",
1346 "readonly");
1347 /* start mdmon if needed. */
1348 if (!err) {
1349 if (!mdmon_running(st->container_dev))
1350 start_mdmon(st->container_dev);
1351 ping_monitor(devnum2devname(st->container_dev));
1352 }
1353 break;
1354 }
1355 if (!err)
1356 sysfs_set_safemode(content, content->safe_mode_delay);
1357 if (verbose >= 0) {
1358 if (err)
1359 fprintf(stderr, Name
1360 ": array %s now has %d devices",
1361 chosen_name, working + preexist);
1362 else
1363 fprintf(stderr, Name
1364 ": Started %s with %d devices",
1365 chosen_name, working + preexist);
1366 if (preexist)
1367 fprintf(stderr, " (%d new)", working);
1368 fprintf(stderr, "\n");
1369 }
1370 if (!err)
1371 wait_for(chosen_name, mdfd);
1372 close(mdfd);
1373 return 0;
1374 /* FIXME should have an O_EXCL and wait for read-auto */
1375 } else {
1376 if (verbose >= 0)
1377 fprintf(stderr, Name
1378 ": %s assembled with %d devices but "
1379 "not started\n",
1380 chosen_name, working);
1381 close(mdfd);
1382 return 1;
1383 }
1384 }
1385 #endif
1386
Unnamed repository; edit this file 'description' to name the repository.