Use uuid as /dev name when assembling array of uncertain origin.
[thirdparty/mdadm.git] / Assemble.c
1 /*
2  * mdadm - manage Linux "md" devices aka RAID arrays.
3  *
4  * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5  *
6  *
7  *    This program is free software; you can redistribute it and/or modify
8  *    it under the terms of the GNU General Public License as published by
9  *    the Free Software Foundation; either version 2 of the License, or
10  *    (at your option) any later version.
11  *
12  *    This program is distributed in the hope that it will be useful,
13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *    GNU General Public License for more details.
16  *
17  *    You should have received a copy of the GNU General Public License
18  *    along with this program; if not, write to the Free Software
19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  *
21  *    Author: Neil Brown
22  *    Email: <neilb@cse.unsw.edu.au>
23  *    Paper: Neil Brown
24  *           School of Computer Science and Engineering
25  *           The University of New South Wales
26  *           Sydney, 2052
27  *           Australia
28  */
29
30 #include        "mdadm.h"
31 #include        <ctype.h>
32
33 static int name_matches(char *found, char *required, char *homehost)
34 {
35         /* See if the name found matches the required name, possibly
36          * prefixed with 'homehost'
37          */
38         char fnd[33];
39
40         strncpy(fnd, found, 32);
41         fnd[32] = 0;
42         if (strcmp(found, required)==0)
43                 return 1;
44         if (homehost) {
45                 int l = strlen(homehost);
46                 if (l < 32 && fnd[l] == ':' &&
47                     strcmp(fnd+l+1, required)==0)
48                         return 1;
49         }
50         return 0;
51 }
52
53 int Assemble(struct supertype *st, char *mddev, int mdfd,
54              mddev_ident_t ident,
55              mddev_dev_t devlist, char *backup_file,
56              int readonly, int runstop,
57              char *update, char *homehost,
58              int verbose, int force)
59 {
60         /*
61          * The task of Assemble is to find a collection of
62          * devices that should (according to their superblocks)
63          * form an array, and to give this collection to the MD driver.
64          * In Linux-2.4 and later, this involves submitting a
65          * SET_ARRAY_INFO ioctl with no arg - to prepare
66          * the array - and then submit a number of
67          * ADD_NEW_DISK ioctls to add disks into
68          * the array.  Finally RUN_ARRAY might
69          * be submitted to start the array.
70          *
71          * Much of the work of Assemble is in finding and/or
72          * checking the disks to make sure they look right.
73          *
74          * If mddev is not set, then scan must be set and we
75          *  read through the config file for dev+uuid mapping
76          *  We recurse, setting mddev, for each device that
77          *    - isn't running
78          *    - has a valid uuid (or any uuid if !uuidset)
79          *
80          * If mddev is set, we try to determine state of md.
81          *   check version - must be at least 0.90.0
82          *   check kernel version.  must be at least 2.4.
83          *    If not, we can possibly fall back on START_ARRAY
84          *   Try to GET_ARRAY_INFO.
85          *     If possible, give up
86          *     If not, try to STOP_ARRAY just to make sure
87          *
88          * If !uuidset and scan, look in conf-file for uuid
89          *       If not found, give up
90          * If !devlist and scan and uuidset, get list of devs from conf-file
91          *
92          * For each device:
93          *   Check superblock - discard if bad
94          *   Check uuid (set if we don't have one) - discard if no match
95          *   Check superblock similarity if we have a superblock - discard if different
96          *   Record events, devicenum
97          * This should give us a list of devices for the array
98          * We should collect the most recent event number
99          *
100          * Count disks with recent enough event count
101          * While force && !enough disks
102          *    Choose newest rejected disks, update event count
103          *     mark clean and rewrite superblock
104          * If recent kernel:
105          *    SET_ARRAY_INFO
106          *    foreach device with recent events : ADD_NEW_DISK
107          *    if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
108          * If old kernel:
109          *    Check the device numbers in superblock are right
110          *    update superblock if any changes
111          *    START_ARRAY
112          *
113          */
114         int clean = 0;
115         int must_close = 0;
116         int old_linux = 0;
117         int vers = 0; /* Keep gcc quite - it really is initialised */
118         struct {
119                 char *devname;
120                 int uptodate; /* set once we decide that this device is as
121                                * recent as everything else in the array.
122                                */
123                 struct mdinfo i;
124         } *devices;
125         int *best = NULL; /* indexed by raid_disk */
126         unsigned int bestcnt = 0;
127         int devcnt = 0;
128         unsigned int okcnt, sparecnt;
129         unsigned int req_cnt;
130         unsigned int i;
131         int most_recent = 0;
132         int chosen_drive;
133         int change = 0;
134         int inargv = 0;
135         int bitmap_done;
136         int start_partial_ok = (runstop >= 0) && (force || devlist==NULL || mdfd < 0);
137         unsigned int num_devs;
138         mddev_dev_t tmpdev;
139         struct mdinfo info;
140         char *avail;
141         int nextspare = 0;
142         int uuid_for_name = 0;
143
144         memset(&info, 0, sizeof(info));
145
146         if (get_linux_version() < 2004000)
147                 old_linux = 1;
148
149         if (mdfd >= 0) {
150                 vers = md_get_version(mdfd);
151                 if (vers <= 0) {
152                         fprintf(stderr, Name ": %s appears not to be an md device.\n", mddev);
153                         return 1;
154                 }
155                 if (vers < 9000) {
156                         fprintf(stderr, Name ": Assemble requires driver version 0.90.0 or later.\n"
157                                 "    Upgrade your kernel or try --build\n");
158                         return 1;
159                 }
160
161                 if (ioctl(mdfd, GET_ARRAY_INFO, &info.array)>=0) {
162                         fprintf(stderr, Name ": device %s already active - cannot assemble it\n",
163                                 mddev);
164                         return 1;
165                 }
166                 ioctl(mdfd, STOP_ARRAY, NULL); /* just incase it was started but has no content */
167         }
168         /*
169          * If any subdevs are listed, then any that don't
170          * match ident are discarded.  Remainder must all match and
171          * become the array.
172          * If no subdevs, then we scan all devices in the config file, but
173          * there must be something in the identity
174          */
175
176         if (!devlist &&
177             ident->uuid_set == 0 &&
178             ident->super_minor < 0 &&
179             ident->devices == NULL) {
180                 fprintf(stderr, Name ": No identity information available for %s - cannot assemble.\n",
181                         mddev ? mddev : "further assembly");
182                 return 1;
183         }
184         if (devlist == NULL)
185                 devlist = conf_get_devs();
186         else if (mdfd >= 0)
187                 inargv = 1;
188
189  try_again:
190
191         tmpdev = devlist; num_devs = 0;
192         while (tmpdev) {
193                 if (tmpdev->used)
194                         tmpdev->used = 2;
195                 else
196                         num_devs++;
197                 tmpdev = tmpdev->next;
198         }
199         devices = malloc(num_devs * sizeof(*devices));
200
201         if (!st && ident->st) st = ident->st;
202
203         if (verbose>0)
204             fprintf(stderr, Name ": looking for devices for %s\n",
205                     mddev ? mddev : "further assembly");
206
207         /* first walk the list of devices to find a consistent set
208          * that match the criterea, if that is possible.
209          * We flag the one we like with 'used'.
210          */
211         for (tmpdev = devlist;
212              tmpdev;
213              tmpdev = tmpdev->next) {
214                 char *devname = tmpdev->devname;
215                 int dfd;
216                 struct stat stb;
217                 struct supertype *tst = dup_super(st);
218
219                 if (tmpdev->used > 1) continue;
220
221                 if (ident->devices &&
222                     !match_oneof(ident->devices, devname)) {
223                         if ((inargv && verbose>=0) || verbose > 0)
224                                 fprintf(stderr, Name ": %s is not one of %s\n", devname, ident->devices);
225                         continue;
226                 }
227
228                 dfd = dev_open(devname, O_RDONLY|O_EXCL);
229                 if (dfd < 0) {
230                         if ((inargv && verbose >= 0) || verbose > 0)
231                                 fprintf(stderr, Name ": cannot open device %s: %s\n",
232                                         devname, strerror(errno));
233                         tmpdev->used = 2;
234                 } else if (fstat(dfd, &stb)< 0) {
235                         /* Impossible! */
236                         fprintf(stderr, Name ": fstat failed for %s: %s\n",
237                                 devname, strerror(errno));
238                         tmpdev->used = 2;
239                 } else if ((stb.st_mode & S_IFMT) != S_IFBLK) {
240                         fprintf(stderr, Name ": %s is not a block device.\n",
241                                 devname);
242                         tmpdev->used = 2;
243                 } else if (!tst && (tst = guess_super(dfd)) == NULL) {
244                         if ((inargv && verbose >= 0) || verbose > 0)
245                                 fprintf(stderr, Name ": no recogniseable superblock on %s\n",
246                                         devname);
247                         tmpdev->used = 2;
248                 } else if (tst->ss->load_super(tst,dfd, NULL)) {
249                         if ((inargv && verbose >= 0) || verbose > 0)
250                                 fprintf( stderr, Name ": no RAID superblock on %s\n",
251                                          devname);
252                 } else {
253                         tst->ss->getinfo_super(tst, &info);
254                 }
255                 if (dfd >= 0) close(dfd);
256
257                 if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
258                     (!tst || !tst->sb ||
259                      same_uuid(info.uuid, ident->uuid, tst->ss->swapuuid)==0)) {
260                         if ((inargv && verbose >= 0) || verbose > 0)
261                                 fprintf(stderr, Name ": %s has wrong uuid.\n",
262                                         devname);
263                         goto loop;
264                 }
265                 if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
266                     (!tst || !tst->sb ||
267                      name_matches(info.name, ident->name, homehost)==0)) {
268                         if ((inargv && verbose >= 0) || verbose > 0)
269                                 fprintf(stderr, Name ": %s has wrong name.\n",
270                                         devname);
271                         goto loop;
272                 }
273                 if (ident->super_minor != UnSet &&
274                     (!tst || !tst->sb ||
275                      ident->super_minor != info.array.md_minor)) {
276                         if ((inargv && verbose >= 0) || verbose > 0)
277                                 fprintf(stderr, Name ": %s has wrong super-minor.\n",
278                                         devname);
279                         goto loop;
280                 }
281                 if (ident->level != UnSet &&
282                     (!tst || !tst->sb ||
283                      ident->level != info.array.level)) {
284                         if ((inargv && verbose >= 0) || verbose > 0)
285                                 fprintf(stderr, Name ": %s has wrong raid level.\n",
286                                         devname);
287                         goto loop;
288                 }
289                 if (ident->raid_disks != UnSet &&
290                     (!tst || !tst->sb ||
291                      ident->raid_disks!= info.array.raid_disks)) {
292                         if ((inargv && verbose >= 0) || verbose > 0)
293                                 fprintf(stderr, Name ": %s requires wrong number of drives.\n",
294                                         devname);
295                         goto loop;
296                 }
297                 if (mdfd < 0) {
298                         if (tst == NULL || tst->sb == NULL)
299                                 continue;
300                         switch(tst->ss->match_home(tst, homehost))
301                         {
302                         case 1: /* happy with match. */
303                                 break;
304                         case -1: /* cannot match */
305                                 uuid_for_name = 1;
306                                 break;
307                         case 0: /* Doesn't match */
308                                 if (update)
309                                         /* We are changing the name*/
310                                         break;
311                                 if ((inargv && verbose >= 0) || verbose > 0)
312                                         fprintf(stderr, Name ": %s is not built for "
313                                                 "host %s - using UUID for "
314                                                 "device name.\n",
315                                                 devname, homehost);
316                                 
317                                 /* Auto-assemble, and this is not a usable host */
318                                 /* if update != NULL, we are updating the host
319                                  * name... */
320                                 uuid_for_name = 1;
321                                 break;
322                         }
323                 }
324                 /* If we are this far, then we are nearly commited to this device.
325                  * If the super_block doesn't exist, or doesn't match others,
326                  * then we probably cannot continue
327                  * However if one of the arrays is for the homehost, and
328                  * the other isn't that can disambiguate.
329                  */
330
331                 if (!tst || !tst->sb) {
332                         fprintf(stderr, Name ": %s has no superblock - assembly aborted\n",
333                                 devname);
334                         if (st)
335                                 st->ss->free_super(st);
336                         return 1;
337                 }
338
339                 if (st == NULL)
340                         st = dup_super(tst);
341                 if (st->minor_version == -1)
342                         st->minor_version = tst->minor_version;
343                 if (st->ss != tst->ss ||
344                     st->minor_version != tst->minor_version ||
345                     st->ss->compare_super(st, tst) != 0) {
346                         /* Some mismatch. If exactly one array matches this host,
347                          * we can resolve on that one.
348                          * Or, if we are auto assembling, we just ignore the second
349                          * for now.
350                          */
351                         if (mdfd < 0)
352                                 goto loop;
353                         if (homehost) {
354                                 int first = st->ss->match_home(st, homehost);
355                                 int last = tst->ss->match_home(tst, homehost);
356                                 if (first != last &&
357                                     (first == 1 || last == 1)) {
358                                         /* We can do something */
359                                         if (first) {/* just ignore this one */
360                                                 if ((inargv && verbose >= 0) || verbose > 0)
361                                                         fprintf(stderr, Name ": %s misses out due to wrong homehost\n",
362                                                                 devname);
363                                                 goto loop;
364                                         } else { /* reject all those sofar */
365                                                 mddev_dev_t td;
366                                                 if ((inargv && verbose >= 0) || verbose > 0)
367                                                         fprintf(stderr, Name ": %s overrides previous devices due to good homehost\n",
368                                                                 devname);
369                                                 for (td=devlist; td != tmpdev; td=td->next)
370                                                         if (td->used == 1)
371                                                                 td->used = 0;
372                                                 tmpdev->used = 1;
373                                                 goto loop;
374                                         }
375                                 }
376                         }
377                         fprintf(stderr, Name ": superblock on %s doesn't match others - assembly aborted\n",
378                                 devname);
379                         tst->ss->free_super(tst);
380                         st->ss->free_super(st);
381                         return 1;
382                 }
383
384                 tmpdev->used = 1;
385
386         loop:
387                 if (tst)
388                         tst->ss->free_super(tst);
389         }
390
391         if (mdfd < 0) {
392                 /* So... it is up to me to open the device.
393                  * We create a name '/dev/md/XXX' based on the info in the
394                  * superblock, and call open_mddev on that
395                  */
396                 mdu_array_info_t inf;
397                 char *c;
398                 char nbuf[64];
399                 if (!st || !st->sb) {
400                         return 2;
401                 }
402                 st->ss->getinfo_super(st, &info);
403                 if (uuid_for_name)
404                         c = fname_from_uuid(st, &info, nbuf);
405                 else {
406                         c = strchr(info.name, ':');
407                         if (c) c++; else c= info.name;
408                 }
409                 if (isdigit(*c) && ((ident->autof & 7)==4 || (ident->autof&7)==6))
410                         /* /dev/md/d0 style for partitionable */
411                         asprintf(&mddev, "/dev/md/d%s", c);
412                 else
413                         asprintf(&mddev, "/dev/md/%s", c);
414                 mdfd = open_mddev(mddev, ident->autof);
415                 if (mdfd < 0) {
416                         st->ss->free_super(st);
417                         free(devices);
418                         goto try_again;
419                 }
420                 vers = md_get_version(mdfd);
421                 if (ioctl(mdfd, GET_ARRAY_INFO, &inf)==0) {
422                         for (tmpdev = devlist ;
423                              tmpdev && tmpdev->used != 1;
424                              tmpdev = tmpdev->next)
425                                 ;
426                         fprintf(stderr, Name ": %s already active, cannot restart it!\n", mddev);
427                         if (tmpdev)
428                                 fprintf(stderr, Name ":   %s needed for %s...\n",
429                                         mddev, tmpdev->devname);
430                         close(mdfd);
431                         mdfd = -1;
432                         st->ss->free_super(st);
433                         free(devices);
434                         goto try_again;
435                 }
436                 must_close = 1;
437         }
438
439         /* Ok, no bad inconsistancy, we can try updating etc */
440         bitmap_done = 0;
441         for (tmpdev = devlist; tmpdev; tmpdev=tmpdev->next) if (tmpdev->used == 1) {
442                 char *devname = tmpdev->devname;
443                 struct stat stb;
444                 /* looks like a good enough match to update the super block if needed */
445 #ifndef MDASSEMBLE
446                 if (update) {
447                         int dfd;
448                         /* prepare useful information in info structures */
449                         struct stat stb2;
450                         struct supertype *tst;
451                         fstat(mdfd, &stb2);
452
453                         if (strcmp(update, "uuid")==0 &&
454                             !ident->uuid_set) {
455                                 int rfd;
456                                 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
457                                     read(rfd, ident->uuid, 16) != 16) {
458                                         *(__u32*)(ident->uuid) = random();
459                                         *(__u32*)(ident->uuid+1) = random();
460                                         *(__u32*)(ident->uuid+2) = random();
461                                         *(__u32*)(ident->uuid+3) = random();
462                                 }
463                                 if (rfd >= 0) close(rfd);
464                         }
465                         dfd = dev_open(devname, O_RDWR|O_EXCL);
466
467                         remove_partitions(dfd);
468
469                         tst = dup_super(st);
470                         tst->ss->load_super(tst, dfd, NULL);
471                         tst->ss->getinfo_super(tst, &info);
472
473                         memcpy(info.uuid, ident->uuid, 16);
474                         strcpy(info.name, ident->name);
475                         info.array.md_minor = minor(stb2.st_rdev);
476
477                         tst->ss->update_super(tst, &info, update,
478                                               devname, verbose,
479                                               ident->uuid_set, homehost);
480                         if (strcmp(update, "uuid")==0 &&
481                             !ident->uuid_set) {
482                                 ident->uuid_set = 1;
483                                 memcpy(ident->uuid, info.uuid, 16);
484                         }
485                         if (dfd < 0)
486                                 fprintf(stderr, Name ": Cannot open %s for superblock update\n",
487                                         devname);
488                         else if (tst->ss->store_super(tst, dfd))
489                                 fprintf(stderr, Name ": Could not re-write superblock on %s.\n",
490                                         devname);
491                         if (dfd >= 0)
492                                 close(dfd);
493
494                         if (strcmp(update, "uuid")==0 &&
495                             ident->bitmap_fd >= 0 && !bitmap_done) {
496                                 if (bitmap_update_uuid(ident->bitmap_fd,
497                                                        info.uuid,
498                                                        tst->ss->swapuuid) != 0)
499                                         fprintf(stderr, Name ": Could not update uuid on external bitmap.\n");
500                                 else
501                                         bitmap_done = 1;
502                         }
503                         tst->ss->free_super(tst);
504                 } else
505 #endif
506                 {
507                         struct supertype *tst = dup_super(st);
508                         int dfd;
509                         dfd = dev_open(devname, O_RDWR|O_EXCL);
510
511                         remove_partitions(dfd);
512
513                         tst->ss->load_super(tst, dfd, NULL);
514                         tst->ss->getinfo_super(tst, &info);
515                         tst->ss->free_super(tst);
516                         close(dfd);
517                 }
518
519                 stat(devname, &stb);
520
521                 if (verbose > 0)
522                         fprintf(stderr, Name ": %s is identified as a member of %s, slot %d.\n",
523                                 devname, mddev, info.disk.raid_disk);
524                 devices[devcnt].devname = devname;
525                 devices[devcnt].uptodate = 0;
526                 devices[devcnt].i = info;
527                 devices[devcnt].i.disk.major = major(stb.st_rdev);
528                 devices[devcnt].i.disk.minor = minor(stb.st_rdev);
529                 if (most_recent < devcnt) {
530                         if (devices[devcnt].i.events
531                             > devices[most_recent].i.events)
532                                 most_recent = devcnt;
533                 }
534                 if (info.array.level == -4)
535                         /* with multipath, the raid_disk from the superblock is meaningless */
536                         i = devcnt;
537                 else
538                         i = devices[devcnt].i.disk.raid_disk;
539                 if (i+1 == 0) {
540                         if (nextspare < info.array.raid_disks)
541                                 nextspare = info.array.raid_disks;
542                         i = nextspare++;
543                 } else {
544                         if (i >= info.array.raid_disks &&
545                             i >= nextspare)
546                                 nextspare = i+1;
547                 }
548                 if (i < 10000) {
549                         if (i >= bestcnt) {
550                                 unsigned int newbestcnt = i+10;
551                                 int *newbest = malloc(sizeof(int)*newbestcnt);
552                                 unsigned int c;
553                                 for (c=0; c < newbestcnt; c++)
554                                         if (c < bestcnt)
555                                                 newbest[c] = best[c];
556                                         else
557                                                 newbest[c] = -1;
558                                 if (best)free(best);
559                                 best = newbest;
560                                 bestcnt = newbestcnt;
561                         }
562                         if (best[i] >=0 &&
563                             devices[best[i]].i.events
564                             == devices[devcnt].i.events
565                             && (devices[best[i]].i.disk.minor
566                                 != devices[devcnt].i.disk.minor)
567                             && st->ss == &super0
568                             && info.array.level != LEVEL_MULTIPATH) {
569                                 /* two different devices with identical superblock.
570                                  * Could be a mis-detection caused by overlapping
571                                  * partitions.  fail-safe.
572                                  */
573                                 fprintf(stderr, Name ": WARNING %s and %s appear"
574                                         " to have very similar superblocks.\n"
575                                         "      If they are really different, "
576                                         "please --zero the superblock on one\n"
577                                         "      If they are the same or overlap,"
578                                         " please remove one from %s.\n",
579                                         devices[best[i]].devname, devname,
580                                         inargv ? "the list" :
581                                            "the\n      DEVICE list in mdadm.conf"
582                                         );
583                                 if (must_close) close(mdfd);
584                                 return 1;
585                         }
586                         if (best[i] == -1
587                             || (devices[best[i]].i.events
588                                 < devices[devcnt].i.events))
589                                 best[i] = devcnt;
590                 }
591                 devcnt++;
592         }
593
594         if (devcnt == 0) {
595                 fprintf(stderr, Name ": no devices found for %s\n",
596                         mddev);
597                 if (st)
598                         st->ss->free_super(st);
599                 if (must_close) close(mdfd);
600                 return 1;
601         }
602
603         if (update && strcmp(update, "byteorder")==0)
604                 st->minor_version = 90;
605
606         st->ss->getinfo_super(st, &info);
607         clean = info.array.state & 1;
608
609         /* now we have some devices that might be suitable.
610          * I wonder how many
611          */
612         avail = malloc(info.array.raid_disks);
613         memset(avail, 0, info.array.raid_disks);
614         okcnt = 0;
615         sparecnt=0;
616         for (i=0; i< bestcnt ;i++) {
617                 int j = best[i];
618                 int event_margin = 1; /* always allow a difference of '1'
619                                        * like the kernel does
620                                        */
621                 if (j < 0) continue;
622                 /* note: we ignore error flags in multipath arrays
623                  * as they don't make sense
624                  */
625                 if (info.array.level != -4)
626                         if (!(devices[j].i.disk.state & (1<<MD_DISK_SYNC))) {
627                                 if (!(devices[j].i.disk.state
628                                       & (1<<MD_DISK_FAULTY)))
629                                         sparecnt++;
630                                 continue;
631                         }
632                 if (devices[j].i.events+event_margin >=
633                     devices[most_recent].i.events) {
634                         devices[j].uptodate = 1;
635                         if (i < info.array.raid_disks) {
636                                 okcnt++;
637                                 avail[i]=1;
638                         } else
639                                 sparecnt++;
640                 }
641         }
642         while (force && !enough(info.array.level, info.array.raid_disks,
643                                 info.array.layout, 1,
644                                 avail, okcnt)) {
645                 /* Choose the newest best drive which is
646                  * not up-to-date, update the superblock
647                  * and add it.
648                  */
649                 int fd;
650                 struct supertype *tst;
651                 long long current_events;
652                 chosen_drive = -1;
653                 for (i=0; i<info.array.raid_disks && i < bestcnt; i++) {
654                         int j = best[i];
655                         if (j>=0 &&
656                             !devices[j].uptodate &&
657                             devices[j].i.events > 0 &&
658                             (chosen_drive < 0 ||
659                              devices[j].i.events
660                              > devices[chosen_drive].i.events))
661                                 chosen_drive = j;
662                 }
663                 if (chosen_drive < 0)
664                         break;
665                 current_events = devices[chosen_drive].i.events;
666         add_another:
667                 if (verbose >= 0)
668                         fprintf(stderr, Name ": forcing event count in %s(%d) from %d upto %d\n",
669                                 devices[chosen_drive].devname,
670                                 devices[chosen_drive].i.disk.raid_disk,
671                                 (int)(devices[chosen_drive].i.events),
672                                 (int)(devices[most_recent].i.events));
673                 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
674                 if (fd < 0) {
675                         fprintf(stderr, Name ": Couldn't open %s for write - not updating\n",
676                                 devices[chosen_drive].devname);
677                         devices[chosen_drive].i.events = 0;
678                         continue;
679                 }
680                 tst = dup_super(st);
681                 if (tst->ss->load_super(tst,fd, NULL)) {
682                         close(fd);
683                         fprintf(stderr, Name ": RAID superblock disappeared from %s - not updating.\n",
684                                 devices[chosen_drive].devname);
685                         devices[chosen_drive].i.events = 0;
686                         continue;
687                 }
688                 info.events = devices[most_recent].i.events;
689                 tst->ss->update_super(tst, &info, "force-one",
690                                      devices[chosen_drive].devname, verbose,
691                                      0, NULL);
692
693                 if (tst->ss->store_super(tst, fd)) {
694                         close(fd);
695                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
696                                 devices[chosen_drive].devname);
697                         devices[chosen_drive].i.events = 0;
698                         tst->ss->free_super(tst);
699                         continue;
700                 }
701                 close(fd);
702                 devices[chosen_drive].i.events = devices[most_recent].i.events;
703                 devices[chosen_drive].uptodate = 1;
704                 avail[chosen_drive] = 1;
705                 okcnt++;
706                 tst->ss->free_super(tst);
707
708                 /* If there are any other drives of the same vintage,
709                  * add them in as well.  We can't lose and we might gain
710                  */
711                 for (i=0; i<info.array.raid_disks && i < bestcnt ; i++) {
712                         int j = best[i];
713                         if (j >= 0 &&
714                             !devices[j].uptodate &&
715                             devices[j].i.events > 0 &&
716                             devices[j].i.events == current_events) {
717                                 chosen_drive = j;
718                                 goto add_another;
719                         }
720                 }
721         }
722
723         /* Now we want to look at the superblock which the kernel will base things on
724          * and compare the devices that we think are working with the devices that the
725          * superblock thinks are working.
726          * If there are differences and --force is given, then update this chosen
727          * superblock.
728          */
729         chosen_drive = -1;
730         st->ss->free_super(st);
731         for (i=0; chosen_drive < 0 && i<bestcnt; i++) {
732                 int j = best[i];
733                 int fd;
734
735                 if (j<0)
736                         continue;
737                 if (!devices[j].uptodate)
738                         continue;
739                 chosen_drive = j;
740                 if ((fd=dev_open(devices[j].devname, O_RDONLY|O_EXCL))< 0) {
741                         fprintf(stderr, Name ": Cannot open %s: %s\n",
742                                 devices[j].devname, strerror(errno));
743                         if (must_close) close(mdfd);
744                         return 1;
745                 }
746                 if (st->ss->load_super(st,fd, NULL)) {
747                         close(fd);
748                         fprintf(stderr, Name ": RAID superblock has disappeared from %s\n",
749                                 devices[j].devname);
750                         if (must_close) close(mdfd);
751                         return 1;
752                 }
753                 close(fd);
754         }
755         if (st->sb == NULL) {
756                 fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
757                 if (must_close) close(mdfd);
758                 return 1;
759         }
760         st->ss->getinfo_super(st, &info);
761 #ifndef MDASSEMBLE
762         sysfs_init(&info, mdfd, 0);
763 #endif
764         for (i=0; i<bestcnt; i++) {
765                 int j = best[i];
766                 unsigned int desired_state;
767
768                 if (i < info.array.raid_disks)
769                         desired_state = (1<<MD_DISK_ACTIVE) | (1<<MD_DISK_SYNC);
770                 else
771                         desired_state = 0;
772
773                 if (j<0)
774                         continue;
775                 if (!devices[j].uptodate)
776                         continue;
777
778                 devices[j].i.disk.state = desired_state;
779
780                 if (st->ss->update_super(st, &devices[j].i, "assemble", NULL,
781                                          verbose, 0, NULL)) {
782                         if (force) {
783                                 if (verbose >= 0)
784                                         fprintf(stderr, Name ": "
785                                                 "clearing FAULTY flag for device %d in %s for %s\n",
786                                                 j, mddev, devices[j].devname);
787                                 change = 1;
788                         } else {
789                                 if (verbose >= -1)
790                                         fprintf(stderr, Name ": "
791                                                 "device %d in %s has wrong state in superblock, but %s seems ok\n",
792                                                 i, mddev, devices[j].devname);
793                         }
794                 }
795 #if 0
796                 if (!(super.disks[i].i.disk.state & (1 << MD_DISK_FAULTY))) {
797                         fprintf(stderr, Name ": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
798                                 i, mddev);
799                 }
800 #endif
801         }
802         if (force && !clean &&
803             !enough(info.array.level, info.array.raid_disks,
804                     info.array.layout, clean,
805                     avail, okcnt)) {
806                 change += st->ss->update_super(st, &info, "force-array",
807                                         devices[chosen_drive].devname, verbose,
808                                                0, NULL);
809                 clean = 1;
810         }
811
812         if (change) {
813                 int fd;
814                 fd = dev_open(devices[chosen_drive].devname, O_RDWR|O_EXCL);
815                 if (fd < 0) {
816                         fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
817                                 devices[chosen_drive].devname);
818                         if (must_close) close(mdfd);
819                         return 1;
820                 }
821                 if (st->ss->store_super(st, fd)) {
822                         close(fd);
823                         fprintf(stderr, Name ": Could not re-write superblock on %s\n",
824                                 devices[chosen_drive].devname);
825                         if (must_close) close(mdfd);
826                         return 1;
827                 }
828                 close(fd);
829         }
830
831         /* If we are in the middle of a reshape we may need to restore saved data
832          * that was moved aside due to the reshape overwriting live data
833          * The code of doing this lives in Grow.c
834          */
835 #ifndef MDASSEMBLE
836         if (info.reshape_active) {
837                 int err = 0;
838                 int *fdlist = malloc(sizeof(int)* bestcnt);
839                 for (i=0; i<bestcnt; i++) {
840                         int j = best[i];
841                         if (j >= 0) {
842                                 fdlist[i] = dev_open(devices[j].devname, O_RDWR|O_EXCL);
843                                 if (fdlist[i] < 0) {
844                                         fprintf(stderr, Name ": Could not open %s for write - cannot Assemble array.\n",
845                                                 devices[j].devname);
846                                         err = 1;
847                                         break;
848                                 }
849                         } else
850                                 fdlist[i] = -1;
851                 }
852                 if (!err)
853                         err = Grow_restart(st, &info, fdlist, bestcnt, backup_file);
854                 while (i>0) {
855                         i--;
856                         if (fdlist[i]>=0) close(fdlist[i]);
857                 }
858                 if (err) {
859                         fprintf(stderr, Name ": Failed to restore critical section for reshape, sorry.\n");
860                         if (must_close) close(mdfd);
861                         return err;
862                 }
863         }
864 #endif
865         /* count number of in-sync devices according to the superblock.
866          * We must have this number to start the array without -s or -R
867          */
868         req_cnt = info.array.working_disks;
869
870         /* Almost ready to actually *do* something */
871         if (!old_linux) {
872                 int rv;
873
874                 rv = set_array_info(mdfd, st, &info);
875                 if (rv) {
876                         fprintf(stderr, Name ": failed to set array info for %s: %s\n",
877                                 mddev, strerror(errno));
878                         if (must_close) close(mdfd);
879                         return 1;
880                 }
881                 if (ident->bitmap_fd >= 0) {
882                         if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
883                                 fprintf(stderr, Name ": SET_BITMAP_FILE failed.\n");
884                                 if (must_close) close(mdfd);
885                                 return 1;
886                         }
887                 } else if (ident->bitmap_file) {
888                         /* From config file */
889                         int bmfd = open(ident->bitmap_file, O_RDWR);
890                         if (bmfd < 0) {
891                                 fprintf(stderr, Name ": Could not open bitmap file %s\n",
892                                         ident->bitmap_file);
893                                 if (must_close) close(mdfd);
894                                 return 1;
895                         }
896                         if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
897                                 fprintf(stderr, Name ": Failed to set bitmapfile for %s\n", mddev);
898                                 close(bmfd);
899                                 if (must_close) close(mdfd);
900                                 return 1;
901                         }
902                         close(bmfd);
903                 }
904
905                 /* First, add the raid disks, but add the chosen one last */
906                 for (i=0; i<= bestcnt; i++) {
907                         int j;
908                         if (i < bestcnt) {
909                                 j = best[i];
910                                 if (j == chosen_drive)
911                                         continue;
912                         } else
913                                 j = chosen_drive;
914
915                         if (j >= 0 /* && devices[j].uptodate */) {
916                                 rv = add_disk(mdfd, st, &info, &devices[j].i);
917
918                                 if (rv) {
919                                         fprintf(stderr, Name ": failed to add "
920                                                         "%s to %s: %s\n",
921                                                 devices[j].devname,
922                                                 mddev,
923                                                 strerror(errno));
924                                         if (i < info.array.raid_disks
925                                             || i == bestcnt)
926                                                 okcnt--;
927                                         else
928                                                 sparecnt--;
929                                 } else if (verbose > 0)
930                                         fprintf(stderr, Name ": added %s "
931                                                         "to %s as %d\n",
932                                                 devices[j].devname, mddev,
933                                                 devices[j].i.disk.raid_disk);
934                         } else if (verbose > 0 && i < info.array.raid_disks)
935                                 fprintf(stderr, Name ": no uptodate device for "
936                                                 "slot %d of %s\n",
937                                         i, mddev);
938                 }
939
940                 if (info.array.level == LEVEL_CONTAINER) {
941                         if (verbose >= 0) {
942                                 fprintf(stderr, Name ": Container %s has been "
943                                         "assembled with %d drive%s",
944                                         mddev, okcnt, okcnt==1?"":"s");
945                                 if (okcnt < info.array.raid_disks)
946                                         fprintf(stderr, " (out of %d)",
947                                                 info.array.raid_disks);
948                                 fprintf(stderr, "\n");
949                         }
950                         if (must_close)
951                                 close(mdfd);
952                         return 0;
953                 }
954
955                 if (runstop == 1 ||
956                     (runstop <= 0 &&
957                      ( enough(info.array.level, info.array.raid_disks,
958                               info.array.layout, clean, avail, okcnt) &&
959                        (okcnt >= req_cnt || start_partial_ok)
960                              ))) {
961                         if (ioctl(mdfd, RUN_ARRAY, NULL)==0) {
962                                 if (verbose >= 0) {
963                                         fprintf(stderr, Name ": %s has been started with %d drive%s",
964                                                 mddev, okcnt, okcnt==1?"":"s");
965                                         if (okcnt < info.array.raid_disks)
966                                                 fprintf(stderr, " (out of %d)", info.array.raid_disks);
967                                         if (sparecnt)
968                                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
969                                         fprintf(stderr, ".\n");
970                                 }
971                                 if (must_close) {
972                                         int usecs = 1;
973                                         close(mdfd);
974                                         /* There is a nasty race with 'mdadm --monitor'.
975                                          * If it opens this device before we close it,
976                                          * it gets an incomplete open on which IO
977                                          * doesn't work and the capacity is
978                                          * wrong.
979                                          * If we reopen (to check for layered devices)
980                                          * before --monitor closes, we loose.
981                                          *
982                                          * So: wait upto 1 second for there to be
983                                          * a non-zero capacity.
984                                          */
985                                         while (usecs < 1000) {
986                                                 mdfd = open(mddev, O_RDONLY);
987                                                 if (mdfd >= 0) {
988                                                         unsigned long long size;
989                                                         if (get_dev_size(mdfd, NULL, &size) &&
990                                                             size > 0)
991                                                                 break;
992                                                         close(mdfd);
993                                                 }
994                                                 usleep(usecs);
995                                                 usecs <<= 1;
996                                         }
997                                 }
998                                 return 0;
999                         }
1000                         fprintf(stderr, Name ": failed to RUN_ARRAY %s: %s\n",
1001                                 mddev, strerror(errno));
1002
1003                         if (!enough(info.array.level, info.array.raid_disks,
1004                                     info.array.layout, 1, avail, okcnt))
1005                                 fprintf(stderr, Name ": Not enough devices to "
1006                                         "start the array.\n");
1007                         else if (!enough(info.array.level,
1008                                          info.array.raid_disks,
1009                                          info.array.layout, clean,
1010                                          avail, okcnt))
1011                                 fprintf(stderr, Name ": Not enough devices to "
1012                                         "start the array while not clean "
1013                                         "- consider --force.\n");
1014
1015                         if (must_close) {
1016                                 ioctl(mdfd, STOP_ARRAY, NULL);
1017                                 close(mdfd);
1018                         }
1019                         return 1;
1020                 }
1021                 if (runstop == -1) {
1022                         fprintf(stderr, Name ": %s assembled from %d drive%s",
1023                                 mddev, okcnt, okcnt==1?"":"s");
1024                         if (okcnt != info.array.raid_disks)
1025                                 fprintf(stderr, " (out of %d)", info.array.raid_disks);
1026                         fprintf(stderr, ", but not started.\n");
1027                         if (must_close) close(mdfd);
1028                         return 0;
1029                 }
1030                 if (verbose >= -1) {
1031                         fprintf(stderr, Name ": %s assembled from %d drive%s", mddev, okcnt, okcnt==1?"":"s");
1032                         if (sparecnt)
1033                                 fprintf(stderr, " and %d spare%s", sparecnt, sparecnt==1?"":"s");
1034                         if (!enough(info.array.level, info.array.raid_disks,
1035                                     info.array.layout, 1, avail, okcnt))
1036                                 fprintf(stderr, " - not enough to start the array.\n");
1037                         else if (!enough(info.array.level,
1038                                          info.array.raid_disks,
1039                                          info.array.layout, clean,
1040                                          avail, okcnt))
1041                                 fprintf(stderr, " - not enough to start the "
1042                                         "array while not clean - consider "
1043                                         "--force.\n");
1044                         else {
1045                                 if (req_cnt == info.array.raid_disks)
1046                                         fprintf(stderr, " - need all %d to start it", req_cnt);
1047                                 else
1048                                         fprintf(stderr, " - need %d of %d to start", req_cnt, info.array.raid_disks);
1049                                 fprintf(stderr, " (use --run to insist).\n");
1050                         }
1051                 }
1052                 if (must_close) {
1053                         ioctl(mdfd, STOP_ARRAY, NULL);
1054                         close(mdfd);
1055                 }
1056                 return 1;
1057         } else {
1058                 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1059                  * been updated to point to the current locations of devices.
1060                  * so we can just start the array
1061                  */
1062                 unsigned long dev;
1063                 dev = makedev(devices[chosen_drive].i.disk.major,
1064                             devices[chosen_drive].i.disk.minor);
1065                 if (ioctl(mdfd, START_ARRAY, dev)) {
1066                     fprintf(stderr, Name ": Cannot start array: %s\n",
1067                             strerror(errno));
1068                 }
1069
1070         }
1071         if (must_close) close(mdfd);
1072         return 0;
1073 }