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1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@cse.unsw.edu.au> | |
23 | * Paper: Neil Brown | |
24 | * School of Computer Science and Engineering | |
25 | * The University of New South Wales | |
26 | * Sydney, 2052 | |
27 | * Australia | |
28 | */ | |
29 | ||
30 | #include "mdadm.h" | |
31 | ||
32 | static int name_matches(char *found, char *required, char *homehost) | |
33 | { | |
34 | /* See if the name found matches the required name, possibly | |
35 | * prefixed with 'homehost' | |
36 | */ | |
37 | char fnd[33]; | |
38 | ||
39 | strncpy(fnd, found, 32); | |
40 | fnd[32] = 0; | |
41 | if (strcmp(found, required)==0) | |
42 | return 1; | |
43 | if (homehost) { | |
44 | int l = strlen(homehost); | |
45 | if (l < 32 && fnd[l] == ':' && | |
46 | strcmp(fnd+l+1, required)==0) | |
47 | return 1; | |
48 | } | |
49 | return 0; | |
50 | } | |
51 | ||
52 | int Assemble(struct supertype *st, char *mddev, int mdfd, | |
53 | mddev_ident_t ident, char *conffile, | |
54 | mddev_dev_t devlist, char *backup_file, | |
55 | int readonly, int runstop, | |
56 | char *update, char *homehost, | |
57 | int verbose, int force) | |
58 | { | |
59 | /* | |
60 | * The task of Assemble is to find a collection of | |
61 | * devices that should (according to their superblocks) | |
62 | * form an array, and to give this collection to the MD driver. | |
63 | * In Linux-2.4 and later, this involves submitting a | |
64 | * SET_ARRAY_INFO ioctl with no arg - to prepare | |
65 | * the array - and then submit a number of | |
66 | * ADD_NEW_DISK ioctls to add disks into | |
67 | * the array. Finally RUN_ARRAY might | |
68 | * be submitted to start the array. | |
69 | * | |
70 | * Much of the work of Assemble is in finding and/or | |
71 | * checking the disks to make sure they look right. | |
72 | * | |
73 | * If mddev is not set, then scan must be set and we | |
74 | * read through the config file for dev+uuid mapping | |
75 | * We recurse, setting mddev, for each device that | |
76 | * - isn't running | |
77 | * - has a valid uuid (or any uuid if !uuidset) | |
78 | * | |
79 | * If mddev is set, we try to determine state of md. | |
80 | * check version - must be at least 0.90.0 | |
81 | * check kernel version. must be at least 2.4. | |
82 | * If not, we can possibly fall back on START_ARRAY | |
83 | * Try to GET_ARRAY_INFO. | |
84 | * If possible, give up | |
85 | * If not, try to STOP_ARRAY just to make sure | |
86 | * | |
87 | * If !uuidset and scan, look in conf-file for uuid | |
88 | * If not found, give up | |
89 | * If !devlist and scan and uuidset, get list of devs from conf-file | |
90 | * | |
91 | * For each device: | |
92 | * Check superblock - discard if bad | |
93 | * Check uuid (set if we don't have one) - discard if no match | |
94 | * Check superblock similarity if we have a superblock - discard if different | |
95 | * Record events, devicenum | |
96 | * This should give us a list of devices for the array | |
97 | * We should collect the most recent event number | |
98 | * | |
99 | * Count disks with recent enough event count | |
100 | * While force && !enough disks | |
101 | * Choose newest rejected disks, update event count | |
102 | * mark clean and rewrite superblock | |
103 | * If recent kernel: | |
104 | * SET_ARRAY_INFO | |
105 | * foreach device with recent events : ADD_NEW_DISK | |
106 | * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY | |
107 | * If old kernel: | |
108 | * Check the device numbers in superblock are right | |
109 | * update superblock if any changes | |
110 | * START_ARRAY | |
111 | * | |
112 | */ | |
113 | int old_linux = 0; | |
114 | int vers; | |
115 | void *first_super = NULL, *super = NULL; | |
116 | struct { | |
117 | char *devname; | |
118 | unsigned int major, minor; | |
119 | unsigned int oldmajor, oldminor; | |
120 | long long events; | |
121 | int uptodate; | |
122 | int state; | |
123 | int raid_disk; | |
124 | int disk_nr; | |
125 | } *devices; | |
126 | int *best = NULL; /* indexed by raid_disk */ | |
127 | unsigned int bestcnt = 0; | |
128 | int devcnt = 0; | |
129 | unsigned int okcnt, sparecnt; | |
130 | unsigned int req_cnt; | |
131 | unsigned int i; | |
132 | int most_recent = 0; | |
133 | int chosen_drive; | |
134 | int change = 0; | |
135 | int inargv = 0; | |
136 | int start_partial_ok = (runstop >= 0) && (force || devlist==NULL); | |
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(conffile); | |
183 | else inargv = 1; | |
184 | ||
185 | tmpdev = devlist; num_devs = 0; | |
186 | while (tmpdev) { | |
187 | num_devs++; | |
188 | tmpdev = tmpdev->next; | |
189 | } | |
190 | devices = malloc(num_devs * sizeof(*devices)); | |
191 | ||
192 | if (!st && ident->st) st = ident->st; | |
193 | ||
194 | if (verbose>0) | |
195 | fprintf(stderr, Name ": looking for devices for %s\n", | |
196 | mddev ? mddev : "further assembly"); | |
197 | ||
198 | /* first walk the list of devices to find a consistent set | |
199 | * that match the criterea, if that is possible. | |
200 | * We flag the one we like with 'used'. | |
201 | */ | |
202 | for (tmpdev = devlist; | |
203 | tmpdev; | |
204 | tmpdev = tmpdev->next) { | |
205 | char *devname = tmpdev->devname; | |
206 | int dfd; | |
207 | struct stat stb; | |
208 | struct supertype *tst = st; | |
209 | ||
210 | if (ident->devices && | |
211 | !match_oneof(ident->devices, devname)) { | |
212 | if ((inargv && verbose>=0) || verbose > 0) | |
213 | fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices); | |
214 | continue; | |
215 | } | |
216 | ||
217 | if (super) { | |
218 | free(super); | |
219 | super = NULL; | |
220 | } | |
221 | ||
222 | dfd = dev_open(devname, O_RDONLY|O_EXCL); | |
223 | if (dfd < 0) { | |
224 | if ((inargv && verbose >= 0) || verbose > 0) | |
225 | fprintf(stderr, Name ": cannot open device %s: %s\n", | |
226 | devname, strerror(errno)); | |
227 | } else if (fstat(dfd, &stb)< 0) { | |
228 | /* Impossible! */ | |
229 | fprintf(stderr, Name ": fstat failed for %s: %s\n", | |
230 | devname, strerror(errno)); | |
231 | } else if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
232 | fprintf(stderr, Name ": %s is not a block device.\n", | |
233 | devname); | |
234 | } else if (!tst && (tst = guess_super(dfd)) == NULL) { | |
235 | if ((inargv && verbose >= 0) || verbose > 0) | |
236 | fprintf(stderr, Name ": no recogniseable superblock\n"); | |
237 | } else if (tst->ss->load_super(tst,dfd, &super, NULL)) { | |
238 | if ((inargv && verbose >= 0) || verbose > 0) | |
239 | fprintf( stderr, Name ": no RAID superblock on %s\n", | |
240 | devname); | |
241 | } else { | |
242 | tst->ss->getinfo_super(&info, super); | |
243 | } | |
244 | if (dfd >= 0) close(dfd); | |
245 | ||
246 | if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) && | |
247 | (!super || same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) { | |
248 | if ((inargv && verbose >= 0) || verbose > 0) | |
249 | fprintf(stderr, Name ": %s has wrong uuid.\n", | |
250 | devname); | |
251 | continue; | |
252 | } | |
253 | if (ident->name[0] && (!update || strcmp(update, "name")!= 0) && | |
254 | (!super || name_matches(info.name, ident->name, homehost)==0)) { | |
255 | if ((inargv && verbose >= 0) || verbose > 0) | |
256 | fprintf(stderr, Name ": %s has wrong name.\n", | |
257 | devname); | |
258 | continue; | |
259 | } | |
260 | if (ident->super_minor != UnSet && | |
261 | (!super || ident->super_minor != info.array.md_minor)) { | |
262 | if ((inargv && verbose >= 0) || verbose > 0) | |
263 | fprintf(stderr, Name ": %s has wrong super-minor.\n", | |
264 | devname); | |
265 | continue; | |
266 | } | |
267 | if (ident->level != UnSet && | |
268 | (!super|| ident->level != info.array.level)) { | |
269 | if ((inargv && verbose >= 0) || verbose > 0) | |
270 | fprintf(stderr, Name ": %s has wrong raid level.\n", | |
271 | devname); | |
272 | continue; | |
273 | } | |
274 | if (ident->raid_disks != UnSet && | |
275 | (!super || ident->raid_disks!= info.array.raid_disks)) { | |
276 | if ((inargv && verbose >= 0) || verbose > 0) | |
277 | fprintf(stderr, Name ": %s requires wrong number of drives.\n", | |
278 | devname); | |
279 | continue; | |
280 | } | |
281 | ||
282 | /* If we are this far, then we are nearly commited to this device. | |
283 | * If the super_block doesn't exist, or doesn't match others, | |
284 | * then we probably cannot continue | |
285 | * However if one of the arrays is for the homehost, and | |
286 | * the other isn't that can disambiguate. | |
287 | */ | |
288 | ||
289 | if (!super) { | |
290 | fprintf(stderr, Name ": %s has no superblock - assembly aborted\n", | |
291 | devname); | |
292 | free(first_super); | |
293 | return 1; | |
294 | } | |
295 | ||
296 | if (st == NULL) | |
297 | st = tst; | |
298 | if (st->ss != tst->ss || | |
299 | st->minor_version != tst->minor_version || | |
300 | st->ss->compare_super(&first_super, super) != 0) { | |
301 | /* Some mismatch. If exactly one array matches this host, | |
302 | * we can resolve on that one | |
303 | */ | |
304 | if (homehost) { | |
305 | int first = st->ss->match_home(first_super, homehost); | |
306 | int last = tst->ss->match_home(super, homehost); | |
307 | if (first+last == 1) { | |
308 | /* We can do something */ | |
309 | if (first) {/* just ignore this one */ | |
310 | if ((inargv && verbose >= 0) || verbose > 0) | |
311 | fprintf(stderr, Name ": %s misses out due to wrong homehost\n", | |
312 | devname); | |
313 | continue; | |
314 | } else { /* reject all those sofar */ | |
315 | mddev_dev_t td; | |
316 | if ((inargv && verbose >= 0) || verbose > 0) | |
317 | fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n", | |
318 | devname); | |
319 | for (td=devlist; td != tmpdev; td=td->next) | |
320 | if (td->used == 1) | |
321 | td->used = 0; | |
322 | tmpdev->used = 1; | |
323 | continue; | |
324 | } | |
325 | } | |
326 | } | |
327 | fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n", | |
328 | devname); | |
329 | free(super); | |
330 | free(first_super); | |
331 | return 1; | |
332 | } | |
333 | ||
334 | tmpdev->used = 1; | |
335 | } | |
336 | ||
337 | if (mdfd < 0) { | |
338 | /* So... it is up to me to open the device. | |
339 | * We create a name '/dev/md/XXX' based on the info in the | |
340 | * superblock, and call open_mddev on that | |
341 | */ | |
342 | asprintf(&mddev, "/dev/md/%s", info.name); | |
343 | mdfd = open_mddev(mddev, 0); | |
344 | if (mdfd < 0) | |
345 | return mdfd; | |
346 | } | |
347 | ||
348 | /* Ok, no bad inconsistancy, we can try updating etc */ | |
349 | for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used) { | |
350 | char *devname = tmpdev->devname; | |
351 | struct stat stb; | |
352 | /* looks like a good enough match to update the super block if needed */ | |
353 | if (update) { | |
354 | int dfd; | |
355 | /* prepare useful information in info structures */ | |
356 | struct stat stb2; | |
357 | fstat(mdfd, &stb2); | |
358 | ||
359 | if (strcmp(update, "uuid")==0 && | |
360 | !ident->uuid_set) { | |
361 | int rfd; | |
362 | if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 || | |
363 | read(rfd, ident->uuid, 16) != 16) { | |
364 | *(__u32*)(ident->uuid) = random(); | |
365 | *(__u32*)(ident->uuid+1) = random(); | |
366 | *(__u32*)(ident->uuid+2) = random(); | |
367 | *(__u32*)(ident->uuid+3) = random(); | |
368 | } | |
369 | if (rfd >= 0) close(rfd); | |
370 | } | |
371 | dfd = dev_open(devname, O_RDWR|O_EXCL); | |
372 | ||
373 | if (super) { | |
374 | free(super); | |
375 | super = NULL; | |
376 | } | |
377 | ||
378 | st->ss->load_super(st, dfd, &super, NULL); | |
379 | st->ss->getinfo_super(&info, super); | |
380 | ||
381 | memcpy(info.uuid, ident->uuid, 16); | |
382 | strcpy(info.name, ident->name); | |
383 | info.array.md_minor = minor(stb2.st_rdev); | |
384 | ||
385 | st->ss->update_super(&info, super, update, devname, verbose, | |
386 | ident->uuid_set, homehost); | |
387 | if (strcmp(update, "uuid")==0 && | |
388 | !ident->uuid_set) { | |
389 | ident->uuid_set = 1; | |
390 | memcpy(ident->uuid, info.uuid, 16); | |
391 | } | |
392 | if (dfd < 0) | |
393 | fprintf(stderr, Name ": Cannot open %s for superblock update\n", | |
394 | devname); | |
395 | else if (st->ss->store_super(st, dfd, super)) | |
396 | fprintf(stderr, Name ": Could not re-write superblock on %s.\n", | |
397 | devname); | |
398 | if (dfd >= 0) | |
399 | close(dfd); | |
400 | ||
401 | if (strcmp(update, "uuid")==0 && | |
402 | ident->bitmap_fd) | |
403 | bitmap_update_uuid(ident->bitmap_fd, info.uuid); | |
404 | } | |
405 | ||
406 | stat(devname, &stb); | |
407 | ||
408 | if (verbose > 0) | |
409 | fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n", | |
410 | devname, mddev, info.disk.raid_disk); | |
411 | devices[devcnt].devname = devname; | |
412 | devices[devcnt].major = major(stb.st_rdev); | |
413 | devices[devcnt].minor = minor(stb.st_rdev); | |
414 | devices[devcnt].oldmajor = info.disk.major; | |
415 | devices[devcnt].oldminor = info.disk.minor; | |
416 | devices[devcnt].events = info.events; | |
417 | devices[devcnt].raid_disk = info.disk.raid_disk; | |
418 | devices[devcnt].disk_nr = info.disk.number; | |
419 | devices[devcnt].uptodate = 0; | |
420 | devices[devcnt].state = info.disk.state; | |
421 | if (most_recent < devcnt) { | |
422 | if (devices[devcnt].events | |
423 | > devices[most_recent].events) | |
424 | most_recent = devcnt; | |
425 | } | |
426 | if (info.array.level == -4) | |
427 | /* with multipath, the raid_disk from the superblock is meaningless */ | |
428 | i = devcnt; | |
429 | else | |
430 | i = devices[devcnt].raid_disk; | |
431 | if (i+1 == 0) { | |
432 | if (nextspare < info.array.raid_disks) | |
433 | nextspare = info.array.raid_disks; | |
434 | i = nextspare++; | |
435 | } | |
436 | if (i < 10000) { | |
437 | if (i >= bestcnt) { | |
438 | unsigned int newbestcnt = i+10; | |
439 | int *newbest = malloc(sizeof(int)*newbestcnt); | |
440 | unsigned int c; | |
441 | for (c=0; c < newbestcnt; c++) | |
442 | if (c < bestcnt) | |
443 | newbest[c] = best[c]; | |
444 | else | |
445 | newbest[c] = -1; | |
446 | if (best)free(best); | |
447 | best = newbest; | |
448 | bestcnt = newbestcnt; | |
449 | } | |
450 | if (best[i] == -1 | |
451 | || devices[best[i]].events < devices[devcnt].events) | |
452 | best[i] = devcnt; | |
453 | } | |
454 | devcnt++; | |
455 | } | |
456 | ||
457 | if (super) | |
458 | free(super); | |
459 | super = NULL; | |
460 | ||
461 | if (update && strcmp(update, "byteorder")==0) | |
462 | st->minor_version = 90; | |
463 | ||
464 | if (devcnt == 0) { | |
465 | fprintf(stderr, Name ": no devices found for %s\n", | |
466 | mddev); | |
467 | free(first_super); | |
468 | return 1; | |
469 | } | |
470 | ||
471 | st->ss->getinfo_super(&info, first_super); | |
472 | ||
473 | /* now we have some devices that might be suitable. | |
474 | * I wonder how many | |
475 | */ | |
476 | avail = malloc(info.array.raid_disks); | |
477 | memset(avail, 0, info.array.raid_disks); | |
478 | okcnt = 0; | |
479 | sparecnt=0; | |
480 | for (i=0; i< bestcnt ;i++) { | |
481 | int j = best[i]; | |
482 | int event_margin = 1; /* always allow a difference of '1' | |
483 | * like the kernel does | |
484 | */ | |
485 | if (j < 0) continue; | |
486 | /* note: we ignore error flags in multipath arrays | |
487 | * as they don't make sense | |
488 | */ | |
489 | if (info.array.level != -4) | |
490 | if (!(devices[j].state & (1<<MD_DISK_SYNC))) { | |
491 | if (!(devices[j].state & (1<<MD_DISK_FAULTY))) | |
492 | sparecnt++; | |
493 | continue; | |
494 | } | |
495 | if (devices[j].events+event_margin >= | |
496 | devices[most_recent].events) { | |
497 | devices[j].uptodate = 1; | |
498 | if (i < info.array.raid_disks) { | |
499 | okcnt++; | |
500 | avail[i]=1; | |
501 | } else | |
502 | sparecnt++; | |
503 | } | |
504 | } | |
505 | while (force && !enough(info.array.level, info.array.raid_disks, | |
506 | info.array.layout, | |
507 | avail, okcnt)) { | |
508 | /* Choose the newest best drive which is | |
509 | * not up-to-date, update the superblock | |
510 | * and add it. | |
511 | */ | |
512 | int fd; | |
513 | chosen_drive = -1; | |
514 | for (i=0; i<info.array.raid_disks && i < bestcnt; i++) { | |
515 | int j = best[i]; | |
516 | if (j>=0 && | |
517 | !devices[j].uptodate && | |
518 | devices[j].events > 0 && | |
519 | (chosen_drive < 0 || | |
520 | devices[j].events > devices[chosen_drive].events)) | |
521 | chosen_drive = j; | |
522 | } | |
523 | if (chosen_drive < 0) | |
524 | break; | |
525 | if (verbose >= 0) | |
526 | fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n", | |
527 | devices[chosen_drive].devname, devices[chosen_drive].raid_disk, | |
528 | (int)(devices[chosen_drive].events), | |
529 | (int)(devices[most_recent].events)); | |
530 | fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL); | |
531 | if (fd < 0) { | |
532 | fprintf(stderr, Name ": Couldn't open %s for write - not updating\n", | |
533 | devices[chosen_drive].devname); | |
534 | devices[chosen_drive].events = 0; | |
535 | continue; | |
536 | } | |
537 | if (st->ss->load_super(st,fd, &super, NULL)) { | |
538 | close(fd); | |
539 | fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n", | |
540 | devices[chosen_drive].devname); | |
541 | devices[chosen_drive].events = 0; | |
542 | continue; | |
543 | } | |
544 | info.events = devices[most_recent].events; | |
545 | st->ss->update_super(&info, super, "force", devices[chosen_drive].devname, verbose, 0, NULL); | |
546 | ||
547 | if (st->ss->store_super(st, fd, super)) { | |
548 | close(fd); | |
549 | fprintf(stderr, Name ": Could not re-write superblock on %s\n", | |
550 | devices[chosen_drive].devname); | |
551 | devices[chosen_drive].events = 0; | |
552 | free(super); | |
553 | continue; | |
554 | } | |
555 | close(fd); | |
556 | devices[chosen_drive].events = devices[most_recent].events; | |
557 | devices[chosen_drive].uptodate = 1; | |
558 | avail[chosen_drive] = 1; | |
559 | okcnt++; | |
560 | free(super); | |
561 | } | |
562 | ||
563 | /* Now we want to look at the superblock which the kernel will base things on | |
564 | * and compare the devices that we think are working with the devices that the | |
565 | * superblock thinks are working. | |
566 | * If there are differences and --force is given, then update this chosen | |
567 | * superblock. | |
568 | */ | |
569 | chosen_drive = -1; | |
570 | super = NULL; | |
571 | for (i=0; chosen_drive < 0 && i<bestcnt; i++) { | |
572 | int j = best[i]; | |
573 | int fd; | |
574 | ||
575 | if (j<0) | |
576 | continue; | |
577 | if (!devices[j].uptodate) | |
578 | continue; | |
579 | chosen_drive = j; | |
580 | if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) { | |
581 | fprintf(stderr, Name ": Cannot open %s: %s\n", | |
582 | devices[j].devname, strerror(errno)); | |
583 | return 1; | |
584 | } | |
585 | if (st->ss->load_super(st,fd, &super, NULL)) { | |
586 | close(fd); | |
587 | fprintf(stderr, Name ": RAID superblock has disappeared from %s\n", | |
588 | devices[j].devname); | |
589 | return 1; | |
590 | } | |
591 | close(fd); | |
592 | } | |
593 | if (super == NULL) { | |
594 | fprintf(stderr, Name ": No suitable drives found for %s\n", mddev); | |
595 | return 1; | |
596 | } | |
597 | st->ss->getinfo_super(&info, super); | |
598 | for (i=0; i<bestcnt; i++) { | |
599 | int j = best[i]; | |
600 | unsigned int desired_state; | |
601 | ||
602 | if (i < info.array.raid_disks) | |
603 | desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC); | |
604 | else | |
605 | desired_state = 0; | |
606 | ||
607 | if (j<0) | |
608 | continue; | |
609 | if (!devices[j].uptodate) | |
610 | continue; | |
611 | info.disk.number = devices[j].disk_nr; | |
612 | info.disk.raid_disk = i; | |
613 | info.disk.state = desired_state; | |
614 | ||
615 | if (devices[j].uptodate && | |
616 | st->ss->update_super(&info, super, "assemble", NULL, verbose, 0, NULL)) { | |
617 | if (force) { | |
618 | if (verbose >= 0) | |
619 | fprintf(stderr, Name ": " | |
620 | "clearing FAULTY flag for device %d in %s for %s\n", | |
621 | j, mddev, devices[j].devname); | |
622 | change = 1; | |
623 | } else { | |
624 | if (verbose >= -1) | |
625 | fprintf(stderr, Name ": " | |
626 | "device %d in %s has wrong state in superblock, but %s seems ok\n", | |
627 | i, mddev, devices[j].devname); | |
628 | } | |
629 | } | |
630 | #if 0 | |
631 | if (!devices[j].uptodate && | |
632 | !(super.disks[i].state & (1 << MD_DISK_FAULTY))) { | |
633 | fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n", | |
634 | i, mddev); | |
635 | } | |
636 | #endif | |
637 | } | |
638 | if (force && okcnt == info.array.raid_disks-1) { | |
639 | /* FIXME check event count */ | |
640 | change += st->ss->update_super(&info, super, "force", | |
641 | devices[chosen_drive].devname, verbose, 0, NULL); | |
642 | } | |
643 | ||
644 | if (change) { | |
645 | int fd; | |
646 | fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL); | |
647 | if (fd < 0) { | |
648 | fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n", | |
649 | devices[chosen_drive].devname); | |
650 | return 1; | |
651 | } | |
652 | if (st->ss->store_super(st, fd, super)) { | |
653 | close(fd); | |
654 | fprintf(stderr, Name ": Could not re-write superblock on %s\n", | |
655 | devices[chosen_drive].devname); | |
656 | return 1; | |
657 | } | |
658 | close(fd); | |
659 | } | |
660 | ||
661 | /* If we are in the middle of a reshape we may need to restore saved data | |
662 | * that was moved aside due to the reshape overwriting live data | |
663 | * The code of doing this lives in Grow.c | |
664 | */ | |
665 | #ifndef MDASSEMBLE | |
666 | if (info.reshape_active) { | |
667 | int err = 0; | |
668 | int *fdlist = malloc(sizeof(int)* bestcnt); | |
669 | for (i=0; i<bestcnt; i++) { | |
670 | int j = best[i]; | |
671 | if (j >= 0) { | |
672 | fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL); | |
673 | if (fdlist[i] < 0) { | |
674 | fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n", | |
675 | devices[j].devname); | |
676 | err = 1; | |
677 | break; | |
678 | } | |
679 | } else | |
680 | fdlist[i] = -1; | |
681 | } | |
682 | if (!err) | |
683 | err = Grow_restart(st, &info, fdlist, bestcnt, backup_file); | |
684 | while (i>0) { | |
685 | i--; | |
686 | if (fdlist[i]>=0) close(fdlist[i]); | |
687 | } | |
688 | if (err) { | |
689 | fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n"); | |
690 | return err; | |
691 | } | |
692 | } | |
693 | #endif | |
694 | /* count number of in-sync devices according to the superblock. | |
695 | * We must have this number to start the array without -s or -R | |
696 | */ | |
697 | req_cnt = info.array.working_disks; | |
698 | ||
699 | /* Almost ready to actually *do* something */ | |
700 | if (!old_linux) { | |
701 | int rv; | |
702 | if ((vers % 100) >= 1) { /* can use different versions */ | |
703 | mdu_array_info_t inf; | |
704 | memset(&inf, 0, sizeof(inf)); | |
705 | inf.major_version = st->ss->major; | |
706 | inf.minor_version = st->minor_version; | |
707 | rv = ioctl(mdfd, SET_ARRAY_INFO, &inf); | |
708 | } else | |
709 | rv = ioctl(mdfd, SET_ARRAY_INFO, NULL); | |
710 | ||
711 | if (rv) { | |
712 | fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n", | |
713 | mddev, strerror(errno)); | |
714 | return 1; | |
715 | } | |
716 | if (ident->bitmap_fd >= 0) { | |
717 | if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) { | |
718 | fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n"); | |
719 | return 1; | |
720 | } | |
721 | } else if (ident->bitmap_file) { | |
722 | /* From config file */ | |
723 | int bmfd = open(ident->bitmap_file, O_RDWR); | |
724 | if (bmfd < 0) { | |
725 | fprintf(stderr, Name ": Could not open bitmap file %s\n", | |
726 | ident->bitmap_file); | |
727 | return 1; | |
728 | } | |
729 | if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) { | |
730 | fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev); | |
731 | close(bmfd); | |
732 | return 1; | |
733 | } | |
734 | close(bmfd); | |
735 | } | |
736 | ||
737 | /* First, add the raid disks, but add the chosen one last */ | |
738 | for (i=0; i<= bestcnt; i++) { | |
739 | int j; | |
740 | if (i < bestcnt) { | |
741 | j = best[i]; | |
742 | if (j == chosen_drive) | |
743 | continue; | |
744 | } else | |
745 | j = chosen_drive; | |
746 | ||
747 | if (j >= 0 /* && devices[j].uptodate */) { | |
748 | mdu_disk_info_t disk; | |
749 | memset(&disk, 0, sizeof(disk)); | |
750 | disk.major = devices[j].major; | |
751 | disk.minor = devices[j].minor; | |
752 | if (ioctl(mdfd, ADD_NEW_DISK, &disk)!=0) { | |
753 | fprintf(stderr, Name ": failed to add %s to %s: %s\n", | |
754 | devices[j].devname, | |
755 | mddev, | |
756 | strerror(errno)); | |
757 | if (i < info.array.raid_disks || i == bestcnt) | |
758 | okcnt--; | |
759 | else | |
760 | sparecnt--; | |
761 | } else if (verbose > 0) | |
762 | fprintf(stderr, Name ": added %s to %s as %d\n", | |
763 | devices[j].devname, mddev, devices[j].raid_disk); | |
764 | } else if (verbose > 0 && i < info.array.raid_disks) | |
765 | fprintf(stderr, Name ": no uptodate device for slot %d of %s\n", | |
766 | i, mddev); | |
767 | } | |
768 | ||
769 | if (runstop == 1 || | |
770 | (runstop <= 0 && | |
771 | ( enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt) && | |
772 | (okcnt >= req_cnt || start_partial_ok) | |
773 | ))) { | |
774 | if (ioctl(mdfd, RUN_ARRAY, NULL)==0) { | |
775 | if (verbose >= 0) { | |
776 | fprintf(stderr, Name ": %s has been started with %d drive%s", | |
777 | mddev, okcnt, okcnt==1?"":"s"); | |
778 | if (okcnt < info.array.raid_disks) | |
779 | fprintf(stderr, " (out of %d)", info.array.raid_disks); | |
780 | if (sparecnt) | |
781 | fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s"); | |
782 | fprintf(stderr, ".\n"); | |
783 | } | |
784 | return 0; | |
785 | } | |
786 | fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n", | |
787 | mddev, strerror(errno)); | |
788 | return 1; | |
789 | } | |
790 | if (runstop == -1) { | |
791 | fprintf(stderr, Name ": %s assembled from %d drive%s", | |
792 | mddev, okcnt, okcnt==1?"":"s"); | |
793 | if (okcnt != info.array.raid_disks) | |
794 | fprintf(stderr, " (out of %d)", info.array.raid_disks); | |
795 | fprintf(stderr, ", but not started.\n"); | |
796 | return 0; | |
797 | } | |
798 | if (verbose >= 0) { | |
799 | fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s"); | |
800 | if (sparecnt) | |
801 | fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s"); | |
802 | if (!enough(info.array.level, info.array.raid_disks, info.array.layout, avail, okcnt)) | |
803 | fprintf(stderr, " - not enough to start the array.\n"); | |
804 | else { | |
805 | if (req_cnt == info.array.raid_disks) | |
806 | fprintf(stderr, " - need all %d to start it", req_cnt); | |
807 | else | |
808 | fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks); | |
809 | fprintf(stderr, " (use --run to insist).\n"); | |
810 | } | |
811 | } | |
812 | return 1; | |
813 | } else { | |
814 | /* The "chosen_drive" is a good choice, and if necessary, the superblock has | |
815 | * been updated to point to the current locations of devices. | |
816 | * so we can just start the array | |
817 | */ | |
818 | unsigned long dev; | |
819 | dev = makedev(devices[chosen_drive].major, | |
820 | devices[chosen_drive].minor); | |
821 | if (ioctl(mdfd, START_ARRAY, dev)) { | |
822 | fprintf(stderr, Name ": Cannot start array: %s\n", | |
823 | strerror(errno)); | |
824 | } | |
825 | ||
826 | } | |
827 | return 0; | |
828 | } |