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