afc3015144d3f581dc1024405296c0747c34e7f0
[thirdparty/mdadm.git] / mdadm.c
1 /*
2  * mdadm - manage Linux "md" devices aka RAID arrays.
3  *
4  * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
5  *
6  *
7  *    This program is free software; you can redistribute it and/or modify
8  *    it under the terms of the GNU General Public License as published by
9  *    the Free Software Foundation; either version 2 of the License, or
10  *    (at your option) any later version.
11  *
12  *    This program is distributed in the hope that it will be useful,
13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *    GNU General Public License for more details.
16  *
17  *    You should have received a copy of the GNU General Public License
18  *    along with this program; if not, write to the Free Software
19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  *
21  *    Author: Neil Brown
22  *    Email: <neilb@suse.de>
23  *
24  *    Additions for bitmap and write-behind RAID options, Copyright (C) 2003-2004,
25  *    Paul Clements, SteelEye Technology, Inc.
26  */
27
28 #include "mdadm.h"
29 #include "md_p.h"
30 #include <ctype.h>
31
32 static int scan_assemble(struct supertype *ss,
33                          struct context *c,
34                          struct mddev_ident *ident);
35 static int misc_scan(char devmode, struct context *c);
36 static int stop_scan(int verbose);
37 static int misc_list(struct mddev_dev *devlist,
38                      struct mddev_ident *ident,
39                      char *dump_directory,
40                      struct supertype *ss, struct context *c);
41 const char Name[] = "mdadm";
42
43 int main(int argc, char *argv[])
44 {
45         int mode = 0;
46         int opt;
47         int option_index;
48         int rv;
49         int i;
50
51         unsigned long long array_size = 0;
52         unsigned long long data_offset = INVALID_SECTORS;
53         struct mddev_ident ident;
54         char *configfile = NULL;
55         int devmode = 0;
56         int bitmap_fd = -1;
57         struct mddev_dev *devlist = NULL;
58         struct mddev_dev **devlistend = & devlist;
59         struct mddev_dev *dv;
60         int devs_found = 0;
61         char *symlinks = NULL;
62         int grow_continue = 0;
63         /* autof indicates whether and how to create device node.
64          * bottom 3 bits are style.  Rest (when shifted) are number of parts
65          * 0  - unset
66          * 1  - don't create (no)
67          * 2  - if is_standard, then create (yes)
68          * 3  - create as 'md' - reject is_standard mdp (md)
69          * 4  - create as 'mdp' - reject is_standard md (mdp)
70          * 5  - default to md if not is_standard (md in config file)
71          * 6  - default to mdp if not is_standard (part, or mdp in config file)
72          */
73         struct context c = {
74                 .require_homehost = 1,
75         };
76         struct shape s = {
77                 .journaldisks   = 0,
78                 .level          = UnSet,
79                 .layout         = UnSet,
80                 .bitmap_chunk   = UnSet,
81                 .consistency_policy     = CONSISTENCY_POLICY_UNKNOWN,
82         };
83
84         char sys_hostname[256];
85         char *mailaddr = NULL;
86         char *program = NULL;
87         int increments = 20;
88         int daemonise = 0;
89         char *pidfile = NULL;
90         int oneshot = 0;
91         int spare_sharing = 1;
92         struct supertype *ss = NULL;
93         enum flag_mode writemostly = FlagDefault;
94         enum flag_mode failfast = FlagDefault;
95         char *shortopt = short_options;
96         int dosyslog = 0;
97         int rebuild_map = 0;
98         char *remove_path = NULL;
99         char *udev_filename = NULL;
100         char *dump_directory = NULL;
101
102         int print_help = 0;
103         FILE *outf;
104
105         int mdfd = -1;
106
107         srandom(time(0) ^ getpid());
108
109         ident.uuid_set = 0;
110         ident.level = UnSet;
111         ident.raid_disks = UnSet;
112         ident.super_minor = UnSet;
113         ident.devices = 0;
114         ident.spare_group = NULL;
115         ident.autof = 0;
116         ident.st = NULL;
117         ident.bitmap_fd = -1;
118         ident.bitmap_file = NULL;
119         ident.name[0] = 0;
120         ident.container = NULL;
121         ident.member = NULL;
122
123         if (get_linux_version() < 2006015) {
124                 pr_err("This version of mdadm does not support kernels older than 2.6.15\n");
125                 exit(1);
126         }
127
128         while ((option_index = -1),
129                (opt = getopt_long(argc, argv, shortopt, long_options,
130                                   &option_index)) != -1) {
131                 int newmode = mode;
132                 /* firstly, some mode-independent options */
133                 switch(opt) {
134                 case HelpOptions:
135                         print_help = 2;
136                         continue;
137                 case 'h':
138                         print_help = 1;
139                         continue;
140
141                 case 'V':
142                         fputs(Version, stderr);
143                         exit(0);
144
145                 case 'v': c.verbose++;
146                         continue;
147
148                 case 'q': c.verbose--;
149                         continue;
150
151                 case 'b':
152                         if (mode == ASSEMBLE || mode == BUILD ||
153                             mode == CREATE || mode == GROW ||
154                             mode == INCREMENTAL || mode == MANAGE)
155                                 break; /* b means bitmap */
156                 case Brief:
157                         c.brief = 1;
158                         continue;
159
160                 case 'Y': c.export++;
161                         continue;
162
163                 case HomeHost:
164                         if (strcasecmp(optarg, "<ignore>") == 0)
165                                 c.require_homehost = 0;
166                         else
167                                 c.homehost = optarg;
168                         continue;
169
170                 case OffRootOpt:
171                         /* Silently ignore old option */
172                         continue;
173
174                 case Prefer:
175                         if (c.prefer)
176                                 free(c.prefer);
177                         if (asprintf(&c.prefer, "/%s/", optarg) <= 0)
178                                 c.prefer = NULL;
179                         continue;
180
181                 case ':':
182                 case '?':
183                         fputs(Usage, stderr);
184                         exit(2);
185                 }
186                 /* second, figure out the mode.
187                  * Some options force the mode.  Others
188                  * set the mode if it isn't already
189                  */
190
191                 switch(opt) {
192                 case ManageOpt:
193                         newmode = MANAGE;
194                         shortopt = short_bitmap_options;
195                         break;
196                 case 'a':
197                 case Add:
198                 case AddSpare:
199                 case AddJournal:
200                 case 'r':
201                 case Remove:
202                 case Replace:
203                 case With:
204                 case 'f':
205                 case Fail:
206                 case ReAdd: /* re-add */
207                 case ClusterConfirm:
208                         if (!mode) {
209                                 newmode = MANAGE;
210                                 shortopt = short_bitmap_options;
211                         }
212                         break;
213
214                 case 'A': newmode = ASSEMBLE;
215                         shortopt = short_bitmap_auto_options;
216                         break;
217                 case 'B': newmode = BUILD;
218                         shortopt = short_bitmap_auto_options;
219                         break;
220                 case 'C': newmode = CREATE;
221                         shortopt = short_bitmap_auto_options;
222                         break;
223                 case 'F': newmode = MONITOR;
224                         break;
225                 case 'G': newmode = GROW;
226                         shortopt = short_bitmap_options;
227                         break;
228                 case 'I': newmode = INCREMENTAL;
229                         shortopt = short_bitmap_auto_options;
230                         break;
231                 case AutoDetect:
232                         newmode = AUTODETECT;
233                         break;
234
235                 case MiscOpt:
236                 case 'D':
237                 case 'E':
238                 case 'X':
239                 case 'Q':
240                 case ExamineBB:
241                 case Dump:
242                 case Restore:
243                 case Action:
244                         newmode = MISC;
245                         break;
246
247                 case 'R':
248                 case 'S':
249                 case 'o':
250                 case 'w':
251                 case 'W':
252                 case WaitOpt:
253                 case Waitclean:
254                 case DetailPlatform:
255                 case KillSubarray:
256                 case UpdateSubarray:
257                 case UdevRules:
258                 case KillOpt:
259                         if (!mode)
260                                 newmode = MISC;
261                         break;
262
263                 case NoSharing:
264                         newmode = MONITOR;
265                         break;
266                 }
267                 if (mode && newmode == mode) {
268                         /* everybody happy ! */
269                 } else if (mode && newmode != mode) {
270                         /* not allowed.. */
271                         pr_err("");
272                         if (option_index >= 0)
273                                 fprintf(stderr, "--%s", long_options[option_index].name);
274                         else
275                                 fprintf(stderr, "-%c", opt);
276                         fprintf(stderr, " would set mdadm mode to \"%s\", but it is already set to \"%s\".\n",
277                                 map_num(modes, newmode),
278                                 map_num(modes, mode));
279                         exit(2);
280                 } else if (!mode && newmode) {
281                         mode = newmode;
282                         if (mode == MISC && devs_found) {
283                                 pr_err("No action given for %s in --misc mode\n",
284                                         devlist->devname);
285                                 cont_err("Action options must come before device names\n");
286                                 exit(2);
287                         }
288                 } else {
289                         /* special case of -c --help */
290                         if ((opt == 'c' || opt == ConfigFile) &&
291                             (strncmp(optarg, "--h", 3) == 0 ||
292                              strncmp(optarg, "-h", 2) == 0)) {
293                                 fputs(Help_config, stdout);
294                                 exit(0);
295                         }
296
297                         /* If first option is a device, don't force the mode yet */
298                         if (opt == 1) {
299                                 if (devs_found == 0) {
300                                         dv = xmalloc(sizeof(*dv));
301                                         dv->devname = optarg;
302                                         dv->disposition = devmode;
303                                         dv->writemostly = writemostly;
304                                         dv->failfast = failfast;
305                                         dv->used = 0;
306                                         dv->next = NULL;
307                                         *devlistend = dv;
308                                         devlistend = &dv->next;
309
310                                         devs_found++;
311                                         continue;
312                                 }
313                                 /* No mode yet, and this is the second device ... */
314                                 pr_err("An option must be given to set the mode before a second device\n"
315                                         "       (%s) is listed\n", optarg);
316                                 exit(2);
317                         }
318                         if (option_index >= 0)
319                                 pr_err("--%s", long_options[option_index].name);
320                         else
321                                 pr_err("-%c", opt);
322                         fprintf(stderr, " does not set the mode, and so cannot be the first option.\n");
323                         exit(2);
324                 }
325
326                 /* if we just set the mode, then done */
327                 switch(opt) {
328                 case ManageOpt:
329                 case MiscOpt:
330                 case 'A':
331                 case 'B':
332                 case 'C':
333                 case 'F':
334                 case 'G':
335                 case 'I':
336                 case AutoDetect:
337                         continue;
338                 }
339                 if (opt == 1) {
340                         /* an undecorated option - must be a device name.
341                          */
342
343                         if (devs_found > 0 && devmode == DetailPlatform) {
344                                 pr_err("controller may only be specified once. %s ignored\n",
345                                                 optarg);
346                                 continue;
347                         }
348
349                         if (devs_found > 0 && mode == MANAGE && !devmode) {
350                                 pr_err("Must give one of -a/-r/-f for subsequent devices at %s\n", optarg);
351                                 exit(2);
352                         }
353                         if (devs_found > 0 && mode == GROW && !devmode) {
354                                 pr_err("Must give -a/--add for devices to add: %s\n", optarg);
355                                 exit(2);
356                         }
357                         dv = xmalloc(sizeof(*dv));
358                         dv->devname = optarg;
359                         dv->disposition = devmode;
360                         dv->writemostly = writemostly;
361                         dv->failfast = failfast;
362                         dv->used = 0;
363                         dv->next = NULL;
364                         *devlistend = dv;
365                         devlistend = &dv->next;
366
367                         devs_found++;
368                         continue;
369                 }
370
371                 /* We've got a mode, and opt is now something else which
372                  * could depend on the mode */
373 #define O(a,b) ((a<<16)|b)
374                 switch (O(mode,opt)) {
375                 case O(GROW,'c'):
376                 case O(GROW,ChunkSize):
377                 case O(CREATE,'c'):
378                 case O(CREATE,ChunkSize):
379                 case O(BUILD,'c'): /* chunk or rounding */
380                 case O(BUILD,ChunkSize): /* chunk or rounding */
381                         if (s.chunk) {
382                                 pr_err("chunk/rounding may only be specified once. Second value is %s.\n", optarg);
383                                 exit(2);
384                         }
385                         s.chunk = parse_size(optarg);
386                         if (s.chunk == INVALID_SECTORS ||
387                             s.chunk < 8 || (s.chunk&1)) {
388                                 pr_err("invalid chunk/rounding value: %s\n",
389                                         optarg);
390                                 exit(2);
391                         }
392                         /* Convert sectors to K */
393                         s.chunk /= 2;
394                         continue;
395
396                 case O(INCREMENTAL, 'e'):
397                 case O(CREATE,'e'):
398                 case O(ASSEMBLE,'e'):
399                 case O(MISC,'e'): /* set metadata (superblock) information */
400                         if (ss) {
401                                 pr_err("metadata information already given\n");
402                                 exit(2);
403                         }
404                         for(i = 0; !ss && superlist[i]; i++)
405                                 ss = superlist[i]->match_metadata_desc(optarg);
406
407                         if (!ss) {
408                                 pr_err("unrecognised metadata identifier: %s\n", optarg);
409                                 exit(2);
410                         }
411                         continue;
412
413                 case O(MANAGE,'W'):
414                 case O(MANAGE,WriteMostly):
415                 case O(BUILD,'W'):
416                 case O(BUILD,WriteMostly):
417                 case O(CREATE,'W'):
418                 case O(CREATE,WriteMostly):
419                         /* set write-mostly for following devices */
420                         writemostly = FlagSet;
421                         continue;
422
423                 case O(MANAGE,'w'):
424                         /* clear write-mostly for following devices */
425                         writemostly = FlagClear;
426                         continue;
427
428                 case O(MANAGE,FailFast):
429                 case O(CREATE,FailFast):
430                         failfast = FlagSet;
431                         continue;
432                 case O(MANAGE,NoFailFast):
433                         failfast = FlagClear;
434                         continue;
435
436                 case O(GROW,'z'):
437                 case O(CREATE,'z'):
438                 case O(BUILD,'z'): /* size */
439                         if (s.size > 0) {
440                                 pr_err("size may only be specified once. Second value is %s.\n", optarg);
441                                 exit(2);
442                         }
443                         if (strcmp(optarg, "max") == 0)
444                                 s.size = MAX_SIZE;
445                         else {
446                                 s.size = parse_size(optarg);
447                                 if (s.size == INVALID_SECTORS || s.size < 8) {
448                                         pr_err("invalid size: %s\n", optarg);
449                                         exit(2);
450                                 }
451                                 /* convert sectors to K */
452                                 s.size /= 2;
453                         }
454                         continue;
455
456                 case O(GROW,'Z'): /* array size */
457                         if (array_size > 0) {
458                                 pr_err("array-size may only be specified once. Second value is %s.\n", optarg);
459                                 exit(2);
460                         }
461                         if (strcmp(optarg, "max") == 0)
462                                 array_size = MAX_SIZE;
463                         else {
464                                 array_size = parse_size(optarg);
465                                 if (array_size == 0 ||
466                                     array_size == INVALID_SECTORS) {
467                                         pr_err("invalid array size: %s\n",
468                                                 optarg);
469                                         exit(2);
470                                 }
471                         }
472                         continue;
473
474                 case O(CREATE,DataOffset):
475                 case O(GROW,DataOffset):
476                         if (data_offset != INVALID_SECTORS) {
477                                 pr_err("data-offset may only be specified one. Second value is %s.\n", optarg);
478                                 exit(2);
479                         }
480                         if (mode == CREATE && strcmp(optarg, "variable") == 0)
481                                 data_offset = VARIABLE_OFFSET;
482                         else
483                                 data_offset = parse_size(optarg);
484                         if (data_offset == INVALID_SECTORS) {
485                                 pr_err("invalid data-offset: %s\n",
486                                         optarg);
487                                 exit(2);
488                         }
489                         continue;
490
491                 case O(GROW,'l'):
492                 case O(CREATE,'l'):
493                 case O(BUILD,'l'): /* set raid level*/
494                         if (s.level != UnSet) {
495                                 pr_err("raid level may only be set once.  Second value is %s.\n", optarg);
496                                 exit(2);
497                         }
498                         s.level = map_name(pers, optarg);
499                         if (s.level == UnSet) {
500                                 pr_err("invalid raid level: %s\n",
501                                         optarg);
502                                 exit(2);
503                         }
504                         if (s.level != 0 && s.level != LEVEL_LINEAR &&
505                             s.level != 1 && s.level != LEVEL_MULTIPATH &&
506                             s.level != LEVEL_FAULTY && s.level != 10 &&
507                             mode == BUILD) {
508                                 pr_err("Raid level %s not permitted with --build.\n",
509                                         optarg);
510                                 exit(2);
511                         }
512                         if (s.sparedisks > 0 && s.level < 1 && s.level >= -1) {
513                                 pr_err("raid level %s is incompatible with spare-devices setting.\n",
514                                         optarg);
515                                 exit(2);
516                         }
517                         ident.level = s.level;
518                         continue;
519
520                 case O(GROW, 'p'): /* new layout */
521                 case O(GROW, Layout):
522                         if (s.layout_str) {
523                                 pr_err("layout may only be sent once.  Second value was %s\n", optarg);
524                                 exit(2);
525                         }
526                         s.layout_str = optarg;
527                         /* 'Grow' will parse the value */
528                         continue;
529
530                 case O(CREATE,'p'): /* raid5 layout */
531                 case O(CREATE,Layout):
532                 case O(BUILD,'p'): /* faulty layout */
533                 case O(BUILD,Layout):
534                         if (s.layout != UnSet) {
535                                 pr_err("layout may only be sent once.  Second value was %s\n", optarg);
536                                 exit(2);
537                         }
538                         switch(s.level) {
539                         default:
540                                 pr_err("layout not meaningful for %s arrays.\n",
541                                         map_num(pers, s.level));
542                                 exit(2);
543                         case UnSet:
544                                 pr_err("raid level must be given before layout.\n");
545                                 exit(2);
546
547                         case 5:
548                                 s.layout = map_name(r5layout, optarg);
549                                 if (s.layout == UnSet) {
550                                         pr_err("layout %s not understood for raid5.\n",
551                                                 optarg);
552                                         exit(2);
553                                 }
554                                 break;
555                         case 6:
556                                 s.layout = map_name(r6layout, optarg);
557                                 if (s.layout == UnSet) {
558                                         pr_err("layout %s not understood for raid6.\n",
559                                                 optarg);
560                                         exit(2);
561                                 }
562                                 break;
563
564                         case 10:
565                                 s.layout = parse_layout_10(optarg);
566                                 if (s.layout < 0) {
567                                         pr_err("layout for raid10 must be 'nNN', 'oNN' or 'fNN' where NN is a number, not %s\n", optarg);
568                                         exit(2);
569                                 }
570                                 break;
571                         case LEVEL_FAULTY:
572                                 /* Faulty
573                                  * modeNNN
574                                  */
575                                 s.layout = parse_layout_faulty(optarg);
576                                 if (s.layout == -1) {
577                                         pr_err("layout %s not understood for faulty.\n",
578                                                 optarg);
579                                         exit(2);
580                                 }
581                                 break;
582                         }
583                         continue;
584
585                 case O(CREATE,AssumeClean):
586                 case O(BUILD,AssumeClean): /* assume clean */
587                 case O(GROW,AssumeClean):
588                         s.assume_clean = 1;
589                         continue;
590
591                 case O(GROW,'n'):
592                 case O(CREATE,'n'):
593                 case O(BUILD,'n'): /* number of raid disks */
594                         if (s.raiddisks) {
595                                 pr_err("raid-devices set twice: %d and %s\n",
596                                         s.raiddisks, optarg);
597                                 exit(2);
598                         }
599                         s.raiddisks = parse_num(optarg);
600                         if (s.raiddisks <= 0) {
601                                 pr_err("invalid number of raid devices: %s\n",
602                                         optarg);
603                                 exit(2);
604                         }
605                         ident.raid_disks = s.raiddisks;
606                         continue;
607                 case O(ASSEMBLE, Nodes):
608                 case O(GROW, Nodes):
609                 case O(CREATE, Nodes):
610                         c.nodes = parse_num(optarg);
611                         if (c.nodes < 2) {
612                                 pr_err("clustered array needs two nodes at least: %s\n",
613                                         optarg);
614                                 exit(2);
615                         }
616                         continue;
617                 case O(CREATE, ClusterName):
618                 case O(ASSEMBLE, ClusterName):
619                         c.homecluster = optarg;
620                         if (strlen(c.homecluster) > 64) {
621                                 pr_err("Cluster name too big.\n");
622                                 exit(2);
623                         }
624                         continue;
625                 case O(CREATE,'x'): /* number of spare (eXtra) disks */
626                         if (s.sparedisks) {
627                                 pr_err("spare-devices set twice: %d and %s\n",
628                                        s.sparedisks, optarg);
629                                 exit(2);
630                         }
631                         if (s.level != UnSet && s.level <= 0 && s.level >= -1) {
632                                 pr_err("spare-devices setting is incompatible with raid level %d\n",
633                                         s.level);
634                                 exit(2);
635                         }
636                         s.sparedisks = parse_num(optarg);
637                         if (s.sparedisks < 0) {
638                                 pr_err("invalid number of spare-devices: %s\n",
639                                         optarg);
640                                 exit(2);
641                         }
642                         continue;
643
644                 case O(CREATE,'a'):
645                 case O(CREATE,Auto):
646                 case O(BUILD,'a'):
647                 case O(BUILD,Auto):
648                 case O(INCREMENTAL,'a'):
649                 case O(INCREMENTAL,Auto):
650                 case O(ASSEMBLE,'a'):
651                 case O(ASSEMBLE,Auto): /* auto-creation of device node */
652                         c.autof = parse_auto(optarg, "--auto flag", 0);
653                         continue;
654
655                 case O(CREATE,Symlinks):
656                 case O(BUILD,Symlinks):
657                 case O(ASSEMBLE,Symlinks): /* auto creation of symlinks in /dev to /dev/md */
658                         symlinks = optarg;
659                         continue;
660
661                 case O(BUILD,'f'): /* force honouring '-n 1' */
662                 case O(BUILD,Force): /* force honouring '-n 1' */
663                 case O(GROW,'f'): /* ditto */
664                 case O(GROW,Force): /* ditto */
665                 case O(CREATE,'f'): /* force honouring of device list */
666                 case O(CREATE,Force): /* force honouring of device list */
667                 case O(ASSEMBLE,'f'): /* force assembly */
668                 case O(ASSEMBLE,Force): /* force assembly */
669                 case O(MISC,'f'): /* force zero */
670                 case O(MISC,Force): /* force zero */
671                 case O(MANAGE,Force): /* add device which is too large */
672                         c.force = 1;
673                         continue;
674                         /* now for the Assemble options */
675                 case O(ASSEMBLE, FreezeReshape):   /* Freeze reshape during
676                                                     * initrd phase */
677                 case O(INCREMENTAL, FreezeReshape):
678                         c.freeze_reshape = 1;
679                         continue;
680                 case O(CREATE,'u'): /* uuid of array */
681                 case O(ASSEMBLE,'u'): /* uuid of array */
682                         if (ident.uuid_set) {
683                                 pr_err("uuid cannot be set twice.  Second value %s.\n", optarg);
684                                 exit(2);
685                         }
686                         if (parse_uuid(optarg, ident.uuid))
687                                 ident.uuid_set = 1;
688                         else {
689                                 pr_err("Bad uuid: %s\n", optarg);
690                                 exit(2);
691                         }
692                         continue;
693
694                 case O(CREATE,'N'):
695                 case O(ASSEMBLE,'N'):
696                 case O(MISC,'N'):
697                         if (ident.name[0]) {
698                                 pr_err("name cannot be set twice.   Second value %s.\n", optarg);
699                                 exit(2);
700                         }
701                         if (mode == MISC && !c.subarray) {
702                                 pr_err("-N/--name only valid with --update-subarray in misc mode\n");
703                                 exit(2);
704                         }
705                         if (strlen(optarg) > 32) {
706                                 pr_err("name '%s' is too long, 32 chars max.\n",
707                                         optarg);
708                                 exit(2);
709                         }
710                         strcpy(ident.name, optarg);
711                         continue;
712
713                 case O(ASSEMBLE,'m'): /* super-minor for array */
714                 case O(ASSEMBLE,SuperMinor):
715                         if (ident.super_minor != UnSet) {
716                                 pr_err("super-minor cannot be set twice.  Second value: %s.\n", optarg);
717                                 exit(2);
718                         }
719                         if (strcmp(optarg, "dev") == 0)
720                                 ident.super_minor = -2;
721                         else {
722                                 ident.super_minor = parse_num(optarg);
723                                 if (ident.super_minor < 0) {
724                                         pr_err("Bad super-minor number: %s.\n", optarg);
725                                         exit(2);
726                                 }
727                         }
728                         continue;
729
730                 case O(ASSEMBLE,'o'):
731                 case O(MANAGE,'o'):
732                 case O(CREATE,'o'):
733                         c.readonly = 1;
734                         continue;
735
736                 case O(ASSEMBLE,'U'): /* update the superblock */
737                 case O(MISC,'U'):
738                         if (c.update) {
739                                 pr_err("Can only update one aspect of superblock, both %s and %s given.\n",
740                                         c.update, optarg);
741                                 exit(2);
742                         }
743                         if (mode == MISC && !c.subarray) {
744                                 pr_err("Only subarrays can be updated in misc mode\n");
745                                 exit(2);
746                         }
747                         c.update = optarg;
748                         if (strcmp(c.update, "sparc2.2") == 0)
749                                 continue;
750                         if (strcmp(c.update, "super-minor") == 0)
751                                 continue;
752                         if (strcmp(c.update, "summaries") == 0)
753                                 continue;
754                         if (strcmp(c.update, "resync") == 0)
755                                 continue;
756                         if (strcmp(c.update, "uuid") == 0)
757                                 continue;
758                         if (strcmp(c.update, "name") == 0)
759                                 continue;
760                         if (strcmp(c.update, "homehost") == 0)
761                                 continue;
762                         if (strcmp(c.update, "home-cluster") == 0)
763                                 continue;
764                         if (strcmp(c.update, "nodes") == 0)
765                                 continue;
766                         if (strcmp(c.update, "devicesize") == 0)
767                                 continue;
768                         if (strcmp(c.update, "no-bitmap") == 0)
769                                 continue;
770                         if (strcmp(c.update, "bbl") == 0)
771                                 continue;
772                         if (strcmp(c.update, "no-bbl") == 0)
773                                 continue;
774                         if (strcmp(c.update, "force-no-bbl") == 0)
775                                 continue;
776                         if (strcmp(c.update, "ppl") == 0)
777                                 continue;
778                         if (strcmp(c.update, "no-ppl") == 0)
779                                 continue;
780                         if (strcmp(c.update, "metadata") == 0)
781                                 continue;
782                         if (strcmp(c.update, "revert-reshape") == 0)
783                                 continue;
784                         if (strcmp(c.update, "byteorder") == 0) {
785                                 if (ss) {
786                                         pr_err("must not set metadata type with --update=byteorder.\n");
787                                         exit(2);
788                                 }
789                                 for(i = 0; !ss && superlist[i]; i++)
790                                         ss = superlist[i]->match_metadata_desc(
791                                                 "0.swap");
792                                 if (!ss) {
793                                         pr_err("INTERNAL ERROR cannot find 0.swap\n");
794                                         exit(2);
795                                 }
796
797                                 continue;
798                         }
799                         if (strcmp(c.update,"?") == 0 ||
800                             strcmp(c.update, "help") == 0) {
801                                 outf = stdout;
802                                 fprintf(outf, "%s: ", Name);
803                         } else {
804                                 outf = stderr;
805                                 fprintf(outf,
806                                         "%s: '--update=%s' is invalid.  ",
807                                         Name, c.update);
808                         }
809                         fprintf(outf, "Valid --update options are:\n"
810                 "     'sparc2.2', 'super-minor', 'uuid', 'name', 'nodes', 'resync',\n"
811                 "     'summaries', 'homehost', 'home-cluster', 'byteorder', 'devicesize',\n"
812                 "     'no-bitmap', 'metadata', 'revert-reshape'\n"
813                 "     'bbl', 'no-bbl', 'force-no-bbl', 'ppl', 'no-ppl'\n"
814                                 );
815                         exit(outf == stdout ? 0 : 2);
816
817                 case O(MANAGE,'U'):
818                         /* update=devicesize is allowed with --re-add */
819                         if (devmode != 'A') {
820                                 pr_err("--update in Manage mode only allowed with --re-add.\n");
821                                 exit(1);
822                         }
823                         if (c.update) {
824                                 pr_err("Can only update one aspect of superblock, both %s and %s given.\n",
825                                         c.update, optarg);
826                                 exit(2);
827                         }
828                         c.update = optarg;
829                         if (strcmp(c.update, "devicesize") != 0 &&
830                             strcmp(c.update, "bbl") != 0 &&
831                             strcmp(c.update, "force-no-bbl") != 0 &&
832                             strcmp(c.update, "no-bbl") != 0) {
833                                 pr_err("only 'devicesize', 'bbl', 'no-bbl', and 'force-no-bbl' can be updated with --re-add\n");
834                                 exit(2);
835                         }
836                         continue;
837
838                 case O(INCREMENTAL,NoDegraded):
839                         pr_err("--no-degraded is deprecated in Incremental mode\n");
840                 case O(ASSEMBLE,NoDegraded): /* --no-degraded */
841                         c.runstop = -1; /* --stop isn't allowed for --assemble,
842                                          * so we overload slightly */
843                         continue;
844
845                 case O(ASSEMBLE,'c'):
846                 case O(ASSEMBLE,ConfigFile):
847                 case O(INCREMENTAL, 'c'):
848                 case O(INCREMENTAL, ConfigFile):
849                 case O(MISC, 'c'):
850                 case O(MISC, ConfigFile):
851                 case O(MONITOR,'c'):
852                 case O(MONITOR,ConfigFile):
853                 case O(CREATE,ConfigFile):
854                         if (configfile) {
855                                 pr_err("configfile cannot be set twice.  Second value is %s.\n", optarg);
856                                 exit(2);
857                         }
858                         configfile = optarg;
859                         set_conffile(configfile);
860                         /* FIXME possibly check that config file exists.  Even parse it */
861                         continue;
862                 case O(ASSEMBLE,'s'): /* scan */
863                 case O(MISC,'s'):
864                 case O(MONITOR,'s'):
865                 case O(INCREMENTAL,'s'):
866                         c.scan = 1;
867                         continue;
868
869                 case O(MONITOR,'m'): /* mail address */
870                 case O(MONITOR,EMail):
871                         if (mailaddr)
872                                 pr_err("only specify one mailaddress. %s ignored.\n",
873                                         optarg);
874                         else
875                                 mailaddr = optarg;
876                         continue;
877
878                 case O(MONITOR,'p'): /* alert program */
879                 case O(MONITOR,ProgramOpt): /* alert program */
880                         if (program)
881                                 pr_err("only specify one alter program. %s ignored.\n",
882                                         optarg);
883                         else
884                                 program = optarg;
885                         continue;
886
887                 case O(MONITOR,'r'): /* rebuild increments */
888                 case O(MONITOR,Increment):
889                         increments = atoi(optarg);
890                         if (increments > 99 || increments < 1) {
891                                 pr_err("please specify positive integer between 1 and 99 as rebuild increments.\n");
892                                 exit(2);
893                         }
894                         continue;
895
896                 case O(MONITOR,'d'): /* delay in seconds */
897                 case O(GROW, 'd'):
898                 case O(BUILD,'d'): /* delay for bitmap updates */
899                 case O(CREATE,'d'):
900                         if (c.delay)
901                                 pr_err("only specify delay once. %s ignored.\n",
902                                         optarg);
903                         else {
904                                 c.delay = parse_num(optarg);
905                                 if (c.delay < 1) {
906                                         pr_err("invalid delay: %s\n",
907                                                 optarg);
908                                         exit(2);
909                                 }
910                         }
911                         continue;
912                 case O(MONITOR,'f'): /* daemonise */
913                 case O(MONITOR,Fork):
914                         daemonise = 1;
915                         continue;
916                 case O(MONITOR,'i'): /* pid */
917                         if (pidfile)
918                                 pr_err("only specify one pid file. %s ignored.\n",
919                                         optarg);
920                         else
921                                 pidfile = optarg;
922                         continue;
923                 case O(MONITOR,'1'): /* oneshot */
924                         oneshot = 1;
925                         spare_sharing = 0;
926                         continue;
927                 case O(MONITOR,'t'): /* test */
928                         c.test = 1;
929                         continue;
930                 case O(MONITOR,'y'): /* log messages to syslog */
931                         openlog("mdadm", LOG_PID, SYSLOG_FACILITY);
932                         dosyslog = 1;
933                         continue;
934                 case O(MONITOR, NoSharing):
935                         spare_sharing = 0;
936                         continue;
937
938                         /* now the general management options.  Some are applicable
939                          * to other modes. None have arguments.
940                          */
941                 case O(GROW,'a'):
942                 case O(GROW,Add):
943                 case O(MANAGE,'a'):
944                 case O(MANAGE,Add): /* add a drive */
945                         devmode = 'a';
946                         continue;
947                 case O(MANAGE,AddSpare): /* add drive - never re-add */
948                         devmode = 'S';
949                         continue;
950                 case O(MANAGE,AddJournal): /* add journal */
951                         if (s.journaldisks && (s.level < 4 || s.level > 6)) {
952                                 pr_err("--add-journal is only supported for RAID level 4/5/6.\n");
953                                 exit(2);
954                         }
955                         devmode = 'j';
956                         continue;
957                 case O(MANAGE,ReAdd):
958                         devmode = 'A';
959                         continue;
960                 case O(MANAGE,'r'): /* remove a drive */
961                 case O(MANAGE,Remove):
962                         devmode = 'r';
963                         continue;
964                 case O(MANAGE,'f'): /* set faulty */
965                 case O(MANAGE,Fail):
966                 case O(INCREMENTAL,'f'):
967                 case O(INCREMENTAL,Remove):
968                 case O(INCREMENTAL,Fail): /* r for incremental is taken, use f
969                                            * even though we will both fail and
970                                            * remove the device */
971                         devmode = 'f';
972                         continue;
973                 case O(MANAGE, ClusterConfirm):
974                         devmode = 'c';
975                         continue;
976                 case O(MANAGE,Replace):
977                         /* Mark these devices for replacement */
978                         devmode = 'R';
979                         continue;
980                 case O(MANAGE,With):
981                         /* These are the replacements to use */
982                         if (devmode != 'R') {
983                                 pr_err("--with must follow --replace\n");
984                                 exit(2);
985                         }
986                         devmode = 'W';
987                         continue;
988                 case O(INCREMENTAL,'R'):
989                 case O(MANAGE,'R'):
990                 case O(ASSEMBLE,'R'):
991                 case O(BUILD,'R'):
992                 case O(CREATE,'R'): /* Run the array */
993                         if (c.runstop < 0) {
994                                 pr_err("Cannot both Stop and Run an array\n");
995                                 exit(2);
996                         }
997                         c.runstop = 1;
998                         continue;
999                 case O(MANAGE,'S'):
1000                         if (c.runstop > 0) {
1001                                 pr_err("Cannot both Run and Stop an array\n");
1002                                 exit(2);
1003                         }
1004                         c.runstop = -1;
1005                         continue;
1006                 case O(MANAGE,'t'):
1007                         c.test = 1;
1008                         continue;
1009
1010                 case O(MISC,'Q'):
1011                 case O(MISC,'D'):
1012                 case O(MISC,'E'):
1013                 case O(MISC,KillOpt):
1014                 case O(MISC,'R'):
1015                 case O(MISC,'S'):
1016                 case O(MISC,'X'):
1017                 case O(MISC, ExamineBB):
1018                 case O(MISC,'o'):
1019                 case O(MISC,'w'):
1020                 case O(MISC,'W'):
1021                 case O(MISC, WaitOpt):
1022                 case O(MISC, Waitclean):
1023                 case O(MISC, DetailPlatform):
1024                 case O(MISC, KillSubarray):
1025                 case O(MISC, UpdateSubarray):
1026                 case O(MISC, Dump):
1027                 case O(MISC, Restore):
1028                 case O(MISC ,Action):
1029                         if (opt == KillSubarray || opt == UpdateSubarray) {
1030                                 if (c.subarray) {
1031                                         pr_err("subarray can only be specified once\n");
1032                                         exit(2);
1033                                 }
1034                                 c.subarray = optarg;
1035                         }
1036                         if (opt == Action) {
1037                                 if (c.action) {
1038                                         pr_err("Only one --action can be specified\n");
1039                                         exit(2);
1040                                 }
1041                                 if (strcmp(optarg, "idle") == 0 ||
1042                                     strcmp(optarg, "frozen") == 0 ||
1043                                     strcmp(optarg, "check") == 0 ||
1044                                     strcmp(optarg, "repair") == 0)
1045                                         c.action = optarg;
1046                                 else {
1047                                         pr_err("action must be one of idle, frozen, check, repair\n");
1048                                         exit(2);
1049                                 }
1050                         }
1051                         if (devmode && devmode != opt &&
1052                             (devmode == 'E' ||
1053                              (opt == 'E' && devmode != 'Q'))) {
1054                                 pr_err("--examine/-E cannot be given with ");
1055                                 if (devmode == 'E') {
1056                                         if (option_index >= 0)
1057                                                 fprintf(stderr, "--%s\n",
1058                                                         long_options[option_index].name);
1059                                         else
1060                                                 fprintf(stderr, "-%c\n", opt);
1061                                 } else if (isalpha(devmode))
1062                                         fprintf(stderr, "-%c\n", devmode);
1063                                 else
1064                                         fprintf(stderr, "previous option\n");
1065                                 exit(2);
1066                         }
1067                         devmode = opt;
1068                         if (opt == Dump || opt == Restore) {
1069                                 if (dump_directory != NULL) {
1070                                         pr_err("dump/restore directory specified twice: %s and %s\n",
1071                                                dump_directory, optarg);
1072                                         exit(2);
1073                                 }
1074                                 dump_directory = optarg;
1075                         }
1076                         continue;
1077                 case O(MISC, UdevRules):
1078                         if (devmode && devmode != opt) {
1079                                 pr_err("--udev-rules must be the only option.\n");
1080                         } else {
1081                                 if (udev_filename)
1082                                         pr_err("only specify one udev rule filename. %s ignored.\n",
1083                                                 optarg);
1084                                 else
1085                                         udev_filename = optarg;
1086                         }
1087                         devmode = opt;
1088                         continue;
1089                 case O(MISC,'t'):
1090                         c.test = 1;
1091                         continue;
1092
1093                 case O(MISC, Sparc22):
1094                         if (devmode != 'E') {
1095                                 pr_err("--sparc2.2 only allowed with --examine\n");
1096                                 exit(2);
1097                         }
1098                         c.SparcAdjust = 1;
1099                         continue;
1100
1101                 case O(ASSEMBLE,'b'): /* here we simply set the bitmap file */
1102                 case O(ASSEMBLE,Bitmap):
1103                         if (!optarg) {
1104                                 pr_err("bitmap file needed with -b in --assemble mode\n");
1105                                 exit(2);
1106                         }
1107                         if (strcmp(optarg, "internal") == 0 ||
1108                             strcmp(optarg, "clustered") == 0) {
1109                                 pr_err("no need to specify --bitmap when assembling"
1110                                         " arrays with internal or clustered bitmap\n");
1111                                 continue;
1112                         }
1113                         bitmap_fd = open(optarg, O_RDWR);
1114                         if (!*optarg || bitmap_fd < 0) {
1115                                 pr_err("cannot open bitmap file %s: %s\n", optarg, strerror(errno));
1116                                 exit(2);
1117                         }
1118                         ident.bitmap_fd = bitmap_fd; /* for Assemble */
1119                         continue;
1120
1121                 case O(ASSEMBLE, BackupFile):
1122                 case O(GROW, BackupFile):
1123                         /* Specify a file into which grow might place a backup,
1124                          * or from which assemble might recover a backup
1125                          */
1126                         if (c.backup_file) {
1127                                 pr_err("backup file already specified, rejecting %s\n", optarg);
1128                                 exit(2);
1129                         }
1130                         c.backup_file = optarg;
1131                         continue;
1132
1133                 case O(GROW, Continue):
1134                         /* Continue interrupted grow
1135                          */
1136                         grow_continue = 1;
1137                         continue;
1138                 case O(ASSEMBLE, InvalidBackup):
1139                         /* Acknowledge that the backupfile is invalid, but ask
1140                          * to continue anyway
1141                          */
1142                         c.invalid_backup = 1;
1143                         continue;
1144
1145                 case O(BUILD,'b'):
1146                 case O(BUILD,Bitmap):
1147                 case O(CREATE,'b'):
1148                 case O(CREATE,Bitmap): /* here we create the bitmap */
1149                 case O(GROW,'b'):
1150                 case O(GROW,Bitmap):
1151                         if (s.bitmap_file) {
1152                                 pr_err("bitmap cannot be set twice. Second value: %s.\n", optarg);
1153                                 exit(2);
1154                         }
1155                         if (strcmp(optarg, "internal") == 0 ||
1156                             strcmp(optarg, "none") == 0 ||
1157                             strchr(optarg, '/') != NULL) {
1158                                 s.bitmap_file = optarg;
1159                                 continue;
1160                         }
1161                         if (strcmp(optarg, "clustered") == 0) {
1162                                 s.bitmap_file = optarg;
1163                                 /* Set the default number of cluster nodes
1164                                  * to 4 if not already set by user
1165                                  */
1166                                 if (c.nodes < 1)
1167                                         c.nodes = 4;
1168                                 continue;
1169                         }
1170                         /* probable typo */
1171                         pr_err("bitmap file must contain a '/', or be 'internal', or be 'clustered', or 'none'\n"
1172                                 "       not '%s'\n", optarg);
1173                         exit(2);
1174
1175                 case O(GROW,BitmapChunk):
1176                 case O(BUILD,BitmapChunk):
1177                 case O(CREATE,BitmapChunk): /* bitmap chunksize */
1178                         s.bitmap_chunk = parse_size(optarg);
1179                         if (s.bitmap_chunk == 0 ||
1180                             s.bitmap_chunk == INVALID_SECTORS ||
1181                             s.bitmap_chunk & (s.bitmap_chunk - 1)) {
1182                                 pr_err("invalid bitmap chunksize: %s\n",
1183                                        optarg);
1184                                 exit(2);
1185                         }
1186                         s.bitmap_chunk = s.bitmap_chunk * 512;
1187                         continue;
1188
1189                 case O(GROW, WriteBehind):
1190                 case O(BUILD, WriteBehind):
1191                 case O(CREATE, WriteBehind): /* write-behind mode */
1192                         s.write_behind = DEFAULT_MAX_WRITE_BEHIND;
1193                         if (optarg) {
1194                                 s.write_behind = parse_num(optarg);
1195                                 if (s.write_behind < 0 ||
1196                                     s.write_behind > 16383) {
1197                                         pr_err("Invalid value for maximum outstanding write-behind writes: %s.\n\tMust be between 0 and 16383.\n", optarg);
1198                                         exit(2);
1199                                 }
1200                         }
1201                         continue;
1202
1203                 case O(INCREMENTAL, 'r'):
1204                 case O(INCREMENTAL, RebuildMapOpt):
1205                         rebuild_map = 1;
1206                         continue;
1207                 case O(INCREMENTAL, IncrementalPath):
1208                         remove_path = optarg;
1209                         continue;
1210                 case O(CREATE, WriteJournal):
1211                         if (s.journaldisks) {
1212                                 pr_err("Please specify only one journal device for the array.\n");
1213                                 pr_err("Ignoring --write-journal %s...\n", optarg);
1214                                 continue;
1215                         }
1216                         dv = xmalloc(sizeof(*dv));
1217                         dv->devname = optarg;
1218                         dv->disposition = 'j';  /* WriteJournal */
1219                         dv->used = 0;
1220                         dv->next = NULL;
1221                         *devlistend = dv;
1222                         devlistend = &dv->next;
1223                         devs_found++;
1224
1225                         s.journaldisks = 1;
1226                         continue;
1227                 case O(CREATE, 'k'):
1228                 case O(GROW, 'k'):
1229                         s.consistency_policy = map_name(consistency_policies,
1230                                                         optarg);
1231                         if (s.consistency_policy < CONSISTENCY_POLICY_RESYNC) {
1232                                 pr_err("Invalid consistency policy: %s\n",
1233                                        optarg);
1234                                 exit(2);
1235                         }
1236                         continue;
1237                 }
1238                 /* We have now processed all the valid options. Anything else is
1239                  * an error
1240                  */
1241                 if (option_index > 0)
1242                         pr_err(":option --%s not valid in %s mode\n",
1243                                 long_options[option_index].name,
1244                                 map_num(modes, mode));
1245                 else
1246                         pr_err("option -%c not valid in %s mode\n",
1247                                 opt, map_num(modes, mode));
1248                 exit(2);
1249
1250         }
1251
1252         if (print_help) {
1253                 char *help_text;
1254                 if (print_help == 2)
1255                         help_text = OptionHelp;
1256                 else
1257                         help_text = mode_help[mode];
1258                 if (help_text == NULL)
1259                         help_text = Help;
1260                 fputs(help_text,stdout);
1261                 exit(0);
1262         }
1263
1264         if (s.journaldisks) {
1265                 if (s.level < 4 || s.level > 6) {
1266                         pr_err("--write-journal is only supported for RAID level 4/5/6.\n");
1267                         exit(2);
1268                 }
1269                 if (s.consistency_policy != CONSISTENCY_POLICY_UNKNOWN &&
1270                     s.consistency_policy != CONSISTENCY_POLICY_JOURNAL) {
1271                         pr_err("--write-journal is not supported with consistency policy: %s\n",
1272                                map_num(consistency_policies, s.consistency_policy));
1273                         exit(2);
1274                 }
1275         }
1276
1277         if (mode == CREATE &&
1278             s.consistency_policy != CONSISTENCY_POLICY_UNKNOWN) {
1279                 if (s.level <= 0) {
1280                         pr_err("--consistency-policy not meaningful with level %s.\n",
1281                                map_num(pers, s.level));
1282                         exit(2);
1283                 } else if (s.consistency_policy == CONSISTENCY_POLICY_JOURNAL &&
1284                            !s.journaldisks) {
1285                         pr_err("--write-journal is required for consistency policy: %s\n",
1286                                map_num(consistency_policies, s.consistency_policy));
1287                         exit(2);
1288                 } else if (s.consistency_policy == CONSISTENCY_POLICY_PPL &&
1289                            s.level != 5) {
1290                         pr_err("PPL consistency policy is only supported for RAID level 5.\n");
1291                         exit(2);
1292                 } else if (s.consistency_policy == CONSISTENCY_POLICY_BITMAP &&
1293                            (!s.bitmap_file ||
1294                             strcmp(s.bitmap_file, "none") == 0)) {
1295                         pr_err("--bitmap is required for consistency policy: %s\n",
1296                                map_num(consistency_policies, s.consistency_policy));
1297                         exit(2);
1298                 } else if (s.bitmap_file &&
1299                            strcmp(s.bitmap_file, "none") != 0 &&
1300                            s.consistency_policy != CONSISTENCY_POLICY_BITMAP &&
1301                            s.consistency_policy != CONSISTENCY_POLICY_JOURNAL) {
1302                         pr_err("--bitmap is not compatible with consistency policy: %s\n",
1303                                map_num(consistency_policies, s.consistency_policy));
1304                         exit(2);
1305                 }
1306         }
1307
1308         if (!mode && devs_found) {
1309                 mode = MISC;
1310                 devmode = 'Q';
1311                 if (devlist->disposition == 0)
1312                         devlist->disposition = devmode;
1313         }
1314         if (!mode) {
1315                 fputs(Usage, stderr);
1316                 exit(2);
1317         }
1318
1319         if (symlinks) {
1320                 struct createinfo *ci = conf_get_create_info();
1321
1322                 if (strcasecmp(symlinks, "yes") == 0)
1323                         ci->symlinks = 1;
1324                 else if (strcasecmp(symlinks, "no") == 0)
1325                         ci->symlinks = 0;
1326                 else {
1327                         pr_err("option --symlinks must be 'no' or 'yes'\n");
1328                         exit(2);
1329                 }
1330         }
1331         /* Ok, got the option parsing out of the way
1332          * hopefully it's mostly right but there might be some stuff
1333          * missing
1334          *
1335          * That is mostly checked in the per-mode stuff but...
1336          *
1337          * For @,B,C and A without -s, the first device listed must be
1338          * an md device.  We check that here and open it.
1339          */
1340
1341         if (mode == MANAGE || mode == BUILD || mode == CREATE ||
1342             mode == GROW || (mode == ASSEMBLE && ! c.scan)) {
1343                 if (devs_found < 1) {
1344                         pr_err("an md device must be given in this mode\n");
1345                         exit(2);
1346                 }
1347                 if ((int)ident.super_minor == -2 && c.autof) {
1348                         pr_err("--super-minor=dev is incompatible with --auto\n");
1349                         exit(2);
1350                 }
1351                 if (mode == MANAGE || mode == GROW) {
1352                         mdfd = open_mddev(devlist->devname, 1);
1353                         if (mdfd < 0)
1354                                 exit(1);
1355                 } else
1356                         /* non-existent device is OK */
1357                         mdfd = open_mddev(devlist->devname, 0);
1358                 if (mdfd == -2) {
1359                         pr_err("device %s exists but is not an md array.\n", devlist->devname);
1360                         exit(1);
1361                 }
1362                 if ((int)ident.super_minor == -2) {
1363                         struct stat stb;
1364                         if (mdfd < 0) {
1365                                 pr_err("--super-minor=dev given, and listed device %s doesn't exist.\n",
1366                                         devlist->devname);
1367                                 exit(1);
1368                         }
1369                         fstat(mdfd, &stb);
1370                         ident.super_minor = minor(stb.st_rdev);
1371                 }
1372                 if (mdfd >= 0 && mode != MANAGE && mode != GROW) {
1373                         /* We don't really want this open yet, we just might
1374                          * have wanted to check some things
1375                          */
1376                         close(mdfd);
1377                         mdfd = -1;
1378                 }
1379         }
1380
1381         if (s.raiddisks) {
1382                 if (s.raiddisks == 1 &&  !c.force && s.level != LEVEL_FAULTY) {
1383                         pr_err("'1' is an unusual number of drives for an array, so it is probably\n"
1384                                 "     a mistake.  If you really mean it you will need to specify --force before\n"
1385                                 "     setting the number of drives.\n");
1386                         exit(2);
1387                 }
1388         }
1389
1390         if (c.homehost == NULL && c.require_homehost)
1391                 c.homehost = conf_get_homehost(&c.require_homehost);
1392         if (c.homehost == NULL || strcasecmp(c.homehost, "<system>") == 0) {
1393                 if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
1394                         sys_hostname[sizeof(sys_hostname)-1] = 0;
1395                         c.homehost = sys_hostname;
1396                 }
1397         }
1398         if (c.homehost &&
1399             (!c.homehost[0] || strcasecmp(c.homehost, "<none>") == 0)) {
1400                 c.homehost = NULL;
1401                 c.require_homehost = 0;
1402         }
1403
1404         rv = 0;
1405
1406         set_hooks(); /* set hooks from libs */
1407
1408         if (c.homecluster == NULL && (c.nodes > 0)) {
1409                 c.homecluster = conf_get_homecluster();
1410                 if (c.homecluster == NULL)
1411                         rv = get_cluster_name(&c.homecluster);
1412                 if (rv) {
1413                         pr_err("The md can't get cluster name\n");
1414                         exit(1);
1415                 }
1416         }
1417
1418         if (c.backup_file && data_offset != INVALID_SECTORS) {
1419                 pr_err("--backup-file and --data-offset are incompatible\n");
1420                 exit(2);
1421         }
1422
1423         if ((mode == MISC && devmode == 'E') ||
1424             (mode == MONITOR && spare_sharing == 0))
1425                 /* Anyone may try this */;
1426         else if (geteuid() != 0) {
1427                 pr_err("must be super-user to perform this action\n");
1428                 exit(1);
1429         }
1430
1431         ident.autof = c.autof;
1432
1433         if (c.scan && c.verbose < 2)
1434                 /* --scan implied --brief unless -vv */
1435                 c.brief = 1;
1436
1437         switch(mode) {
1438         case MANAGE:
1439                 /* readonly, add/remove, readwrite, runstop */
1440                 if (c.readonly > 0)
1441                         rv = Manage_ro(devlist->devname, mdfd, c.readonly);
1442                 if (!rv && devs_found>1)
1443                         rv = Manage_subdevs(devlist->devname, mdfd,
1444                                             devlist->next, c.verbose, c.test,
1445                                             c.update, c.force);
1446                 if (!rv && c.readonly < 0)
1447                         rv = Manage_ro(devlist->devname, mdfd, c.readonly);
1448                 if (!rv && c.runstop > 0)
1449                         rv = Manage_run(devlist->devname, mdfd, &c);
1450                 if (!rv && c.runstop < 0)
1451                         rv = Manage_stop(devlist->devname, mdfd, c.verbose, 0);
1452                 break;
1453         case ASSEMBLE:
1454                 if (devs_found == 1 && ident.uuid_set == 0 &&
1455                     ident.super_minor == UnSet && ident.name[0] == 0 &&
1456                     !c.scan ) {
1457                         /* Only a device has been given, so get details from config file */
1458                         struct mddev_ident *array_ident = conf_get_ident(devlist->devname);
1459                         if (array_ident == NULL) {
1460                                 pr_err("%s not identified in config file.\n",
1461                                         devlist->devname);
1462                                 rv |= 1;
1463                                 if (mdfd >= 0)
1464                                         close(mdfd);
1465                         } else {
1466                                 if (array_ident->autof == 0)
1467                                         array_ident->autof = c.autof;
1468                                 rv |= Assemble(ss, devlist->devname, array_ident,
1469                                                NULL, &c);
1470                         }
1471                 } else if (!c.scan)
1472                         rv = Assemble(ss, devlist->devname, &ident,
1473                                       devlist->next, &c);
1474                 else if (devs_found > 0) {
1475                         if (c.update && devs_found > 1) {
1476                                 pr_err("can only update a single array at a time\n");
1477                                 exit(1);
1478                         }
1479                         if (c.backup_file && devs_found > 1) {
1480                                 pr_err("can only assemble a single array when providing a backup file.\n");
1481                                 exit(1);
1482                         }
1483                         for (dv = devlist; dv; dv = dv->next) {
1484                                 struct mddev_ident *array_ident = conf_get_ident(dv->devname);
1485                                 if (array_ident == NULL) {
1486                                         pr_err("%s not identified in config file.\n",
1487                                                 dv->devname);
1488                                         rv |= 1;
1489                                         continue;
1490                                 }
1491                                 if (array_ident->autof == 0)
1492                                         array_ident->autof = c.autof;
1493                                 rv |= Assemble(ss, dv->devname, array_ident,
1494                                                NULL, &c);
1495                         }
1496                 } else {
1497                         if (c.update) {
1498                                 pr_err("--update not meaningful with a --scan assembly.\n");
1499                                 exit(1);
1500                         }
1501                         if (c.backup_file) {
1502                                 pr_err("--backup_file not meaningful with a --scan assembly.\n");
1503                                 exit(1);
1504                         }
1505                         rv = scan_assemble(ss, &c, &ident);
1506                 }
1507
1508                 break;
1509         case BUILD:
1510                 if (c.delay == 0)
1511                         c.delay = DEFAULT_BITMAP_DELAY;
1512                 if (s.write_behind && !s.bitmap_file) {
1513                         pr_err("write-behind mode requires a bitmap.\n");
1514                         rv = 1;
1515                         break;
1516                 }
1517                 if (s.raiddisks == 0) {
1518                         pr_err("no raid-devices specified.\n");
1519                         rv = 1;
1520                         break;
1521                 }
1522
1523                 if (s.bitmap_file) {
1524                         if (strcmp(s.bitmap_file, "internal") == 0 ||
1525                             strcmp(s.bitmap_file, "clustered") == 0) {
1526                                 pr_err("'internal' and 'clustered' bitmaps not supported with --build\n");
1527                                 rv |= 1;
1528                                 break;
1529                         }
1530                 }
1531                 rv = Build(devlist->devname, devlist->next, &s, &c);
1532                 break;
1533         case CREATE:
1534                 if (c.delay == 0)
1535                         c.delay = DEFAULT_BITMAP_DELAY;
1536
1537                 if (c.nodes) {
1538                         if (!s.bitmap_file ||
1539                             strcmp(s.bitmap_file, "clustered") != 0) {
1540                                 pr_err("--nodes argument only compatible with --bitmap=clustered\n");
1541                                 rv = 1;
1542                                 break;
1543                         }
1544
1545                         if (s.level != 1 && s.level != 10) {
1546                                 pr_err("--bitmap=clustered is currently supported with raid1/10 only\n");
1547                                 rv = 1;
1548                                 break;
1549                         }
1550                         if (s.level == 10 && !(is_near_layout_10(s.layout) || s.layout == UnSet)) {
1551                                 pr_err("only near layout is supported with clustered raid10\n");
1552                                 rv = 1;
1553                                 break;
1554                         }
1555                 }
1556
1557                 if (s.write_behind && !s.bitmap_file) {
1558                         pr_err("write-behind mode requires a bitmap.\n");
1559                         rv = 1;
1560                         break;
1561                 }
1562                 if (s.raiddisks == 0) {
1563                         pr_err("no raid-devices specified.\n");
1564                         rv = 1;
1565                         break;
1566                 }
1567
1568                 rv = Create(ss, devlist->devname,
1569                             ident.name, ident.uuid_set ? ident.uuid : NULL,
1570                             devs_found-1, devlist->next,
1571                             &s, &c, data_offset);
1572                 break;
1573         case MISC:
1574                 if (devmode == 'E') {
1575                         if (devlist == NULL && !c.scan) {
1576                                 pr_err("No devices to examine\n");
1577                                 exit(2);
1578                         }
1579                         if (devlist == NULL)
1580                                 devlist = conf_get_devs();
1581                         if (devlist == NULL) {
1582                                 pr_err("No devices listed in %s\n", configfile?configfile:DefaultConfFile);
1583                                 exit(1);
1584                         }
1585                         rv = Examine(devlist, &c, ss);
1586                 } else if (devmode == DetailPlatform) {
1587                         rv = Detail_Platform(ss ? ss->ss : NULL, ss ? c.scan : 1,
1588                                              c.verbose, c.export,
1589                                              devlist ? devlist->devname : NULL);
1590                 } else if (devlist == NULL) {
1591                         if (devmode == 'S' && c.scan)
1592                                 rv = stop_scan(c.verbose);
1593                         else if ((devmode == 'D' || devmode == Waitclean) &&
1594                                  c.scan)
1595                                 rv = misc_scan(devmode, &c);
1596                         else if (devmode == UdevRules)
1597                                 rv = Write_rules(udev_filename);
1598                         else {
1599                                 pr_err("No devices given.\n");
1600                                 exit(2);
1601                         }
1602                 } else
1603                         rv = misc_list(devlist, &ident, dump_directory, ss, &c);
1604                 break;
1605         case MONITOR:
1606                 if (!devlist && !c.scan) {
1607                         pr_err("Cannot monitor: need --scan or at least one device\n");
1608                         rv = 1;
1609                         break;
1610                 }
1611                 if (pidfile && !daemonise) {
1612                         pr_err("Cannot write a pid file when not in daemon mode\n");
1613                         rv = 1;
1614                         break;
1615                 }
1616                 if (c.delay == 0) {
1617                         if (get_linux_version() > 2006016)
1618                                 /* mdstat responds to poll */
1619                                 c.delay = 1000;
1620                         else
1621                                 c.delay = 60;
1622                 }
1623                 rv = Monitor(devlist, mailaddr, program,
1624                              &c, daemonise, oneshot,
1625                              dosyslog, pidfile, increments,
1626                              spare_sharing);
1627                 break;
1628
1629         case GROW:
1630                 if (array_size > 0) {
1631                         /* alway impose array size first, independent of
1632                          * anything else
1633                          * Do not allow level or raid_disks changes at the
1634                          * same time as that can be irreversibly destructive.
1635                          */
1636                         struct mdinfo sra;
1637                         int err;
1638                         if (s.raiddisks || s.level != UnSet) {
1639                                 pr_err("cannot change array size in same operation as changing raiddisks or level.\n"
1640                                         "    Change size first, then check that data is still intact.\n");
1641                                 rv = 1;
1642                                 break;
1643                         }
1644                         if (sysfs_init(&sra, mdfd, NULL)) {
1645                                 rv = 1;
1646                                 break;
1647                         }
1648                         if (array_size == MAX_SIZE)
1649                                 err = sysfs_set_str(&sra, NULL, "array_size", "default");
1650                         else
1651                                 err = sysfs_set_num(&sra, NULL, "array_size", array_size / 2);
1652                         if (err < 0) {
1653                                 if (errno == E2BIG)
1654                                         pr_err("--array-size setting is too large.\n");
1655                                 else
1656                                         pr_err("current kernel does not support setting --array-size\n");
1657                                 rv = 1;
1658                                 break;
1659                         }
1660                 }
1661                 if (devs_found > 1 && s.raiddisks == 0 && s.level == UnSet) {
1662                         /* must be '-a'. */
1663                         if (s.size > 0 || s.chunk ||
1664                             s.layout_str || s.bitmap_file) {
1665                                 pr_err("--add cannot be used with other geometry changes in --grow mode\n");
1666                                 rv = 1;
1667                                 break;
1668                         }
1669                         for (dv = devlist->next; dv; dv = dv->next) {
1670                                 rv = Grow_Add_device(devlist->devname, mdfd,
1671                                                      dv->devname);
1672                                 if (rv)
1673                                         break;
1674                         }
1675                 } else if (s.bitmap_file) {
1676                         if (s.size > 0 || s.raiddisks || s.chunk ||
1677                             s.layout_str || devs_found > 1) {
1678                                 pr_err("--bitmap changes cannot be used with other geometry changes in --grow mode\n");
1679                                 rv = 1;
1680                                 break;
1681                         }
1682                         if (c.delay == 0)
1683                                 c.delay = DEFAULT_BITMAP_DELAY;
1684                         rv = Grow_addbitmap(devlist->devname, mdfd, &c, &s);
1685                 } else if (grow_continue)
1686                         rv = Grow_continue_command(devlist->devname,
1687                                                    mdfd, c.backup_file,
1688                                                    c.verbose);
1689                 else if (s.size > 0 || s.raiddisks || s.layout_str ||
1690                          s.chunk != 0 || s.level != UnSet ||
1691                          data_offset != INVALID_SECTORS) {
1692                         rv = Grow_reshape(devlist->devname, mdfd,
1693                                           devlist->next,
1694                                           data_offset, &c, &s);
1695                 } else if (s.consistency_policy != CONSISTENCY_POLICY_UNKNOWN) {
1696                         rv = Grow_consistency_policy(devlist->devname, mdfd, &c, &s);
1697                 } else if (array_size == 0)
1698                         pr_err("no changes to --grow\n");
1699                 break;
1700         case INCREMENTAL:
1701                 if (rebuild_map) {
1702                         RebuildMap();
1703                 }
1704                 if (c.scan) {
1705                         rv = 1;
1706                         if (devlist) {
1707                                 pr_err("In --incremental mode, a device cannot be given with --scan.\n");
1708                                 break;
1709                         }
1710                         if (c.runstop <= 0) {
1711                                 pr_err("--incremental --scan meaningless without --run.\n");
1712                                 break;
1713                         }
1714                         if (devmode == 'f') {
1715                                 pr_err("--incremental --scan --fail not supported.\n");
1716                                 break;
1717                         }
1718                         rv = IncrementalScan(&c, NULL);
1719                 }
1720                 if (!devlist) {
1721                         if (!rebuild_map && !c.scan) {
1722                                 pr_err("--incremental requires a device.\n");
1723                                 rv = 1;
1724                         }
1725                         break;
1726                 }
1727                 if (devmode == 'f') {
1728                         if (devlist->next) {
1729                                 pr_err("'--incremental --fail' can only handle one device.\n");
1730                                 rv = 1;
1731                                 break;
1732                         }
1733                         rv = IncrementalRemove(devlist->devname, remove_path,
1734                                                c.verbose);
1735                 } else
1736                         rv = Incremental(devlist, &c, ss);
1737                 break;
1738         case AUTODETECT:
1739                 autodetect();
1740                 break;
1741         }
1742         if (mdfd > 0)
1743                 close(mdfd);
1744         exit(rv);
1745 }
1746
1747 static int scan_assemble(struct supertype *ss,
1748                          struct context *c,
1749                          struct mddev_ident *ident)
1750 {
1751         struct mddev_ident *a, *array_list =  conf_get_ident(NULL);
1752         struct mddev_dev *devlist = conf_get_devs();
1753         struct map_ent *map = NULL;
1754         int cnt = 0;
1755         int rv = 0;
1756         int failures, successes;
1757
1758         if (conf_verify_devnames(array_list)) {
1759                 pr_err("Duplicate MD device names in conf file were found.\n");
1760                 return 1;
1761         }
1762         if (devlist == NULL) {
1763                 pr_err("No devices listed in conf file were found.\n");
1764                 return 1;
1765         }
1766         for (a = array_list; a; a = a->next) {
1767                 a->assembled = 0;
1768                 if (a->autof == 0)
1769                         a->autof = c->autof;
1770         }
1771         if (map_lock(&map))
1772                 pr_err("failed to get exclusive lock on mapfile\n");
1773         do {
1774                 failures = 0;
1775                 successes = 0;
1776                 rv = 0;
1777                 for (a = array_list; a; a = a->next) {
1778                         int r;
1779                         if (a->assembled)
1780                                 continue;
1781                         if (a->devname &&
1782                             strcasecmp(a->devname, "<ignore>") == 0)
1783                                 continue;
1784
1785                         r = Assemble(ss, a->devname,
1786                                      a, NULL, c);
1787                         if (r == 0) {
1788                                 a->assembled = 1;
1789                                 successes++;
1790                         } else
1791                                 failures++;
1792                         rv |= r;
1793                         cnt++;
1794                 }
1795         } while (failures && successes);
1796         if (c->homehost && cnt == 0) {
1797                 /* Maybe we can auto-assemble something.
1798                  * Repeatedly call Assemble in auto-assemble mode
1799                  * until it fails
1800                  */
1801                 int rv2;
1802                 int acnt;
1803                 ident->autof = c->autof;
1804                 do {
1805                         struct mddev_dev *devlist = conf_get_devs();
1806                         acnt = 0;
1807                         do {
1808                                 rv2 = Assemble(ss, NULL,
1809                                                ident,
1810                                                devlist, c);
1811                                 if (rv2 == 0) {
1812                                         cnt++;
1813                                         acnt++;
1814                                 }
1815                         } while (rv2 != 2);
1816                         /* Incase there are stacked devices, we need to go around again */
1817                 } while (acnt);
1818                 if (cnt == 0 && rv == 0) {
1819                         pr_err("No arrays found in config file or automatically\n");
1820                         rv = 1;
1821                 } else if (cnt)
1822                         rv = 0;
1823         } else if (cnt == 0 && rv == 0) {
1824                 pr_err("No arrays found in config file\n");
1825                 rv = 1;
1826         }
1827         map_unlock(&map);
1828         return rv;
1829 }
1830
1831 static int misc_scan(char devmode, struct context *c)
1832 {
1833         /* apply --detail or --wait-clean to
1834          * all devices in /proc/mdstat
1835          */
1836         struct mdstat_ent *ms = mdstat_read(0, 1);
1837         struct mdstat_ent *e;
1838         struct map_ent *map = NULL;
1839         int members;
1840         int rv = 0;
1841
1842         for (members = 0; members <= 1; members++) {
1843                 for (e = ms; e; e = e->next) {
1844                         char *name = NULL;
1845                         struct map_ent *me;
1846                         struct stat stb;
1847                         int member = e->metadata_version &&
1848                                 strncmp(e->metadata_version,
1849                                         "external:/", 10) == 0;
1850                         if (members != member)
1851                                 continue;
1852                         me = map_by_devnm(&map, e->devnm);
1853                         if (me && me->path && strcmp(me->path, "/unknown") != 0)
1854                                 name = me->path;
1855                         if (name == NULL || stat(name, &stb) != 0)
1856                                 name = get_md_name(e->devnm);
1857
1858                         if (!name) {
1859                                 pr_err("cannot find device file for %s\n",
1860                                         e->devnm);
1861                                 continue;
1862                         }
1863                         if (devmode == 'D')
1864                                 rv |= Detail(name, c);
1865                         else
1866                                 rv |= WaitClean(name, c->verbose);
1867                         put_md_name(name);
1868                 }
1869         }
1870         free_mdstat(ms);
1871         return rv;
1872 }
1873
1874 static int stop_scan(int verbose)
1875 {
1876         /* apply --stop to all devices in /proc/mdstat */
1877         /* Due to possible stacking of devices, repeat until
1878          * nothing more can be stopped
1879          */
1880         int progress = 1, err;
1881         int last = 0;
1882         int rv = 0;
1883         do {
1884                 struct mdstat_ent *ms = mdstat_read(0, 0);
1885                 struct mdstat_ent *e;
1886
1887                 if (!progress) last = 1;
1888                 progress = 0; err = 0;
1889                 for (e = ms; e; e = e->next) {
1890                         char *name = get_md_name(e->devnm);
1891                         int mdfd;
1892
1893                         if (!name) {
1894                                 pr_err("cannot find device file for %s\n",
1895                                         e->devnm);
1896                                 continue;
1897                         }
1898                         mdfd = open_mddev(name, 1);
1899                         if (mdfd >= 0) {
1900                                 if (Manage_stop(name, mdfd, verbose, !last))
1901                                         err = 1;
1902                                 else
1903                                         progress = 1;
1904                                 close(mdfd);
1905                         }
1906
1907                         put_md_name(name);
1908                 }
1909                 free_mdstat(ms);
1910         } while (!last && err);
1911         if (err)
1912                 rv |= 1;
1913         return rv;
1914 }
1915
1916 static int misc_list(struct mddev_dev *devlist,
1917                      struct mddev_ident *ident,
1918                      char *dump_directory,
1919                      struct supertype *ss, struct context *c)
1920 {
1921         struct mddev_dev *dv;
1922         int rv = 0;
1923
1924         for (dv = devlist; dv; dv = (rv & 16) ? NULL : dv->next) {
1925                 int mdfd = -1;
1926
1927                 switch(dv->disposition) {
1928                 case 'D':
1929                         rv |= Detail(dv->devname, c);
1930                         continue;
1931                 case KillOpt: /* Zero superblock */
1932                         if (ss)
1933                                 rv |= Kill(dv->devname, ss, c->force, c->verbose,0);
1934                         else {
1935                                 int v = c->verbose;
1936                                 do {
1937                                         rv |= Kill(dv->devname, NULL, c->force, v, 0);
1938                                         v = -1;
1939                                 } while (rv == 0);
1940                                 rv &= ~2;
1941                         }
1942                         continue;
1943                 case 'Q':
1944                         rv |= Query(dv->devname);
1945                         continue;
1946                 case 'X':
1947                         rv |= ExamineBitmap(dv->devname, c->brief, ss);
1948                         continue;
1949                 case ExamineBB:
1950                         rv |= ExamineBadblocks(dv->devname, c->brief, ss);
1951                         continue;
1952                 case 'W':
1953                 case WaitOpt:
1954                         rv |= Wait(dv->devname);
1955                         continue;
1956                 case Waitclean:
1957                         rv |= WaitClean(dv->devname, c->verbose);
1958                         continue;
1959                 case KillSubarray:
1960                         rv |= Kill_subarray(dv->devname, c->subarray, c->verbose);
1961                         continue;
1962                 case UpdateSubarray:
1963                         if (c->update == NULL) {
1964                                 pr_err("-U/--update must be specified with --update-subarray\n");
1965                                 rv |= 1;
1966                                 continue;
1967                         }
1968                         rv |= Update_subarray(dv->devname, c->subarray,
1969                                               c->update, ident, c->verbose);
1970                         continue;
1971                 case Dump:
1972                         rv |= Dump_metadata(dv->devname, dump_directory, c, ss);
1973                         continue;
1974                 case Restore:
1975                         rv |= Restore_metadata(dv->devname, dump_directory, c, ss,
1976                                                (dv == devlist && dv->next == NULL));
1977                         continue;
1978                 case Action:
1979                         rv |= SetAction(dv->devname, c->action);
1980                         continue;
1981                 }
1982
1983                 if (dv->devname[0] != '/')
1984                         mdfd = open_dev(dv->devname);
1985                 if (dv->devname[0] == '/' || mdfd < 0)
1986                         mdfd = open_mddev(dv->devname, 1);
1987
1988                 if (mdfd >= 0) {
1989                         switch(dv->disposition) {
1990                         case 'R':
1991                                 c->runstop = 1;
1992                                 rv |= Manage_run(dv->devname, mdfd, c);
1993                                 break;
1994                         case 'S':
1995                                 rv |= Manage_stop(dv->devname, mdfd, c->verbose, 0);
1996                                 break;
1997                         case 'o':
1998                                 rv |= Manage_ro(dv->devname, mdfd, 1);
1999                                 break;
2000                         case 'w':
2001                                 rv |= Manage_ro(dv->devname, mdfd, -1);
2002                                 break;
2003                         }
2004                         close(mdfd);
2005                 } else
2006                         rv |= 1;
2007         }
2008         return rv;
2009 }
2010
2011 int SetAction(char *dev, char *action)
2012 {
2013         int fd = open(dev, O_RDONLY);
2014         struct mdinfo mdi;
2015         int retval;
2016
2017         if (fd < 0) {
2018                 pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
2019                 return 1;
2020         }
2021         retval = sysfs_init(&mdi, fd, NULL);
2022         close(fd);
2023         if (retval) {
2024                 pr_err("%s is no an md array\n", dev);
2025                 return 1;
2026         }
2027
2028         if (sysfs_set_str(&mdi, NULL, "sync_action", action) < 0) {
2029                 pr_err("Count not set action for %s to %s: %s\n",
2030                        dev, action, strerror(errno));
2031                 return 1;
2032         }
2033         return 0;
2034 }