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Create arrays via metadata-update
[thirdparty/mdadm.git] / Create.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30 #include "mdadm.h"
31 #include "md_u.h"
32 #include "md_p.h"
33 #include <ctype.h>
34
35 int Create(struct supertype *st, char *mddev, int mdfd,
36 int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
37 char *name, char *homehost, int *uuid,
38 int subdevs, mddev_dev_t devlist,
39 int runstop, int verbose, int force, int assume_clean,
40 char *bitmap_file, int bitmap_chunk, int write_behind, int delay)
41 {
42 /*
43 * Create a new raid array.
44 *
45 * First check that necessary details are available
46 * (i.e. level, raid-disks)
47 *
48 * Then check each disk to see what might be on it
49 * and report anything interesting.
50 *
51 * If anything looks odd, and runstop not set,
52 * abort.
53 *
54 * SET_ARRAY_INFO and ADD_NEW_DISK, and
55 * if runstop==run, or raiddisks disks were used,
56 * RUN_ARRAY
57 */
58 unsigned long long minsize=0, maxsize=0;
59 char *mindisc = NULL;
60 char *maxdisc = NULL;
61 int dnum;
62 mddev_dev_t dv;
63 int fail=0, warn=0;
64 struct stat stb;
65 int first_missing = subdevs * 2;
66 int second_missing = subdevs * 2;
67 int missing_disks = 0;
68 int insert_point = subdevs * 2; /* where to insert a missing drive */
69 int total_slots;
70 int pass;
71 int vers;
72 int rv;
73 int bitmap_fd;
74 int have_container = 0;
75 int container_fd;
76 int need_mdmon = 0;
77 unsigned long long bitmapsize;
78 struct mdinfo *sra;
79 struct mdinfo info, *infos;
80 int did_default = 0;
81
82 int major_num = BITMAP_MAJOR_HI;
83
84 memset(&info, 0, sizeof(info));
85
86 vers = md_get_version(mdfd);
87 if (vers < 9000) {
88 fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
89 return 1;
90 } else {
91 mdu_array_info_t inf;
92 memset(&inf, 0, sizeof(inf));
93 ioctl(mdfd, GET_ARRAY_INFO, &inf);
94 if (inf.working_disks != 0) {
95 fprintf(stderr, Name ": another array by this name"
96 " is already running.\n");
97 return 1;
98 }
99 }
100 if (level == UnSet) {
101 /* "ddf" and "imsm" metadata only supports one level - should possibly
102 * push this into metadata handler??
103 */
104 if (st && (st->ss == &super_ddf || st->ss == &super_imsm))
105 level = LEVEL_CONTAINER;
106 }
107
108 if (level == UnSet) {
109 fprintf(stderr,
110 Name ": a RAID level is needed to create an array.\n");
111 return 1;
112 }
113 if (raiddisks < 4 && level == 6) {
114 fprintf(stderr,
115 Name ": at least 4 raid-devices needed for level 6\n");
116 return 1;
117 }
118 if (raiddisks > 256 && level == 6) {
119 fprintf(stderr,
120 Name ": no more than 256 raid-devices supported for level 6\n");
121 return 1;
122 }
123 if (raiddisks < 2 && level >= 4) {
124 fprintf(stderr,
125 Name ": at least 2 raid-devices needed for level 4 or 5\n");
126 return 1;
127 }
128 if (level <= 0 && sparedisks) {
129 fprintf(stderr,
130 Name ": This level does not support spare devices\n");
131 return 1;
132 }
133
134 if (subdevs == 1 && strcmp(devlist->devname, "missing") != 0) {
135 /* If given a single device, it might be a container, and we can
136 * extract a device list from there
137 */
138 mdu_array_info_t inf;
139 int fd;
140
141 memset(&inf, 0, sizeof(inf));
142 fd = open(devlist->devname, O_RDONLY, 0);
143 if (fd >= 0 &&
144 ioctl(fd, GET_ARRAY_INFO, &inf) == 0 &&
145 inf.raid_disks == 0) {
146 /* yep, looks like a container */
147 if (st) {
148 rv = st->ss->load_super(st, fd,
149 devlist->devname);
150 if (rv == 0)
151 have_container = 1;
152 } else {
153 st = guess_super(fd);
154 if (st && !(rv = st->ss->
155 load_super(st, fd,
156 devlist->devname)))
157 have_container = 1;
158 else
159 st = NULL;
160 }
161 }
162 if (fd >= 0)
163 close(fd);
164 if (have_container) {
165 subdevs = 0;
166 devlist = NULL;
167 }
168 }
169 if (subdevs > raiddisks+sparedisks) {
170 fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
171 return 1;
172 }
173 if (!have_container && subdevs < raiddisks+sparedisks) {
174 fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
175 return 1;
176 }
177 if (bitmap_file && level <= 0) {
178 fprintf(stderr, Name ": bitmaps not meaningful with level %s\n",
179 map_num(pers, level)?:"given");
180 return 1;
181 }
182
183 /* now set some defaults */
184 if (layout == UnSet)
185 switch(level) {
186 default: /* no layout */
187 layout = 0;
188 break;
189 case 10:
190 layout = 0x102; /* near=2, far=1 */
191 if (verbose > 0)
192 fprintf(stderr,
193 Name ": layout defaults to n1\n");
194 break;
195 case 5:
196 case 6:
197 layout = map_name(r5layout, "default");
198 if (verbose > 0)
199 fprintf(stderr,
200 Name ": layout defaults to %s\n", map_num(r5layout, layout));
201 break;
202 case LEVEL_FAULTY:
203 layout = map_name(faultylayout, "default");
204
205 if (verbose > 0)
206 fprintf(stderr,
207 Name ": layout defaults to %s\n", map_num(faultylayout, layout));
208 break;
209 }
210
211 if (level == 10)
212 /* check layout fits in array*/
213 if ((layout&255) * ((layout>>8)&255) > raiddisks) {
214 fprintf(stderr, Name ": that layout requires at least %d devices\n",
215 (layout&255) * ((layout>>8)&255));
216 return 1;
217 }
218
219 switch(level) {
220 case 4:
221 case 5:
222 case 10:
223 case 6:
224 case 0:
225 case LEVEL_LINEAR: /* linear */
226 if (chunk == 0) {
227 chunk = 64;
228 if (verbose > 0)
229 fprintf(stderr, Name ": chunk size defaults to 64K\n");
230 }
231 break;
232 case 1:
233 case LEVEL_FAULTY:
234 case LEVEL_MULTIPATH:
235 case LEVEL_CONTAINER:
236 if (chunk) {
237 chunk = 0;
238 if (verbose > 0)
239 fprintf(stderr, Name ": chunk size ignored for this level\n");
240 }
241 break;
242 default:
243 fprintf(stderr, Name ": unknown level %d\n", level);
244 return 1;
245 }
246
247 if (st && ! st->ss->validate_geometry(st, level, layout, raiddisks,
248 chunk, size, NULL, NULL))
249 return 1;
250
251 /* now look at the subdevs */
252 info.array.active_disks = 0;
253 info.array.working_disks = 0;
254 dnum = 0;
255 for (dv=devlist; dv; dv=dv->next, dnum++) {
256 char *dname = dv->devname;
257 unsigned long long freesize;
258 if (strcasecmp(dname, "missing")==0) {
259 if (first_missing > dnum)
260 first_missing = dnum;
261 if (second_missing > dnum && dnum > first_missing)
262 second_missing = dnum;
263 missing_disks ++;
264 continue;
265 }
266 info.array.working_disks++;
267 if (dnum < raiddisks)
268 info.array.active_disks++;
269 if (st == NULL) {
270 struct createinfo *ci = conf_get_create_info();
271 if (ci)
272 st = ci->supertype;
273 }
274 if (st == NULL) {
275 /* Need to choose a default metadata, which is different
276 * depending on geometry of array.
277 */
278 int i;
279 char *name = "default";
280 for(i=0; !st && superlist[i]; i++) {
281 st = superlist[i]->match_metadata_desc(name);
282 if (st && !st->ss->validate_geometry
283 (st, level, layout, raiddisks,
284 chunk, size, dname, &freesize))
285 st = NULL;
286 }
287
288 if (!st) {
289 fprintf(stderr, Name ": device %s not suitable "
290 "for any style of array\n",
291 dname);
292 exit(2);
293 }
294 if (st->ss != &super0 ||
295 st->minor_version != 90)
296 did_default = 1;
297 } else {
298 if (!st->ss->validate_geometry(st, level, layout,
299 raiddisks,
300 chunk, size, dname,
301 &freesize)) {
302
303 fprintf(stderr,
304 Name ": %s is not suitable for "
305 "this array.\n",
306 dname);
307 fail = 1;
308 continue;
309 }
310 }
311
312 freesize /= 2; /* convert to K */
313 if (chunk) {
314 /* round to chunk size */
315 freesize = freesize & ~(chunk-1);
316 }
317
318 if (size && freesize < size) {
319 fprintf(stderr, Name ": %s is smaller that given size."
320 " %lluK < %lluK + metadata\n",
321 dname, freesize, size);
322 fail = 1;
323 continue;
324 }
325 if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
326 maxdisc = dname;
327 maxsize = freesize;
328 }
329 if (mindisc ==NULL || (mindisc && freesize < minsize)) {
330 mindisc = dname;
331 minsize = freesize;
332 }
333 if (runstop != 1 || verbose >= 0) {
334 int fd = open(dname, O_RDONLY, 0);
335 if (fd <0 ) {
336 fprintf(stderr, Name ": Cannot open %s: %s\n",
337 dname, strerror(errno));
338 fail=1;
339 continue;
340 }
341 warn |= check_ext2(fd, dname);
342 warn |= check_reiser(fd, dname);
343 warn |= check_raid(fd, dname);
344 close(fd);
345 }
346 }
347 if (fail) {
348 fprintf(stderr, Name ": create aborted\n");
349 return 1;
350 }
351 if (size == 0) {
352 if (mindisc == NULL && !have_container) {
353 fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
354 return 1;
355 }
356 if (level > 0 || level == LEVEL_MULTIPATH
357 || level == LEVEL_FAULTY
358 || st->ss->external ) {
359 /* size is meaningful */
360 if (!st->ss->validate_geometry(st, level, layout,
361 raiddisks,
362 chunk, minsize,
363 NULL, NULL)) {
364 fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
365 return 1;
366 }
367 size = minsize;
368 if (verbose > 0)
369 fprintf(stderr, Name ": size set to %lluK\n", size);
370 }
371 }
372 if (level > 0 && ((maxsize-size)*100 > maxsize)) {
373 if (runstop != 1 || verbose >= 0)
374 fprintf(stderr, Name ": largest drive (%s) exceed size (%lluK) by more than 1%%\n",
375 maxdisc, size);
376 warn = 1;
377 }
378
379 if (warn) {
380 if (runstop!= 1) {
381 if (!ask("Continue creating array? ")) {
382 fprintf(stderr, Name ": create aborted.\n");
383 return 1;
384 }
385 } else {
386 if (verbose > 0)
387 fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
388 }
389 }
390
391 /* If this is raid4/5, we want to configure the last active slot
392 * as missing, so that a reconstruct happens (faster than re-parity)
393 * FIX: Can we do this for raid6 as well?
394 */
395 if (assume_clean==0 && force == 0 && first_missing >= raiddisks) {
396 switch ( level ) {
397 case 4:
398 case 5:
399 insert_point = raiddisks-1;
400 sparedisks++;
401 info.array.active_disks--;
402 missing_disks++;
403 break;
404 default:
405 break;
406 }
407 }
408 /* For raid6, if creating with 1 missing drive, make a good drive
409 * into a spare, else the create will fail
410 */
411 if (assume_clean == 0 && force == 0 && first_missing < raiddisks &&
412 second_missing >= raiddisks && level == 6) {
413 insert_point = raiddisks - 1;
414 if (insert_point == first_missing)
415 insert_point--;
416 sparedisks ++;
417 info.array.active_disks--;
418 missing_disks++;
419 }
420
421 if (level <= 0 && first_missing < subdevs * 2) {
422 fprintf(stderr,
423 Name ": This level does not support missing devices\n");
424 return 1;
425 }
426
427 /* Ok, lets try some ioctls */
428
429 info.array.level = level;
430 info.array.size = size;
431 info.array.raid_disks = raiddisks;
432 /* The kernel should *know* what md_minor we are dealing
433 * with, but it chooses to trust me instead. Sigh
434 */
435 info.array.md_minor = 0;
436 if (fstat(mdfd, &stb)==0)
437 info.array.md_minor = minor(stb.st_rdev);
438 info.array.not_persistent = 0;
439
440 if ( ( (level == 4 || level == 5) &&
441 (insert_point < raiddisks || first_missing < raiddisks) )
442 ||
443 ( level == 6 && (insert_point < raiddisks
444 || second_missing < raiddisks))
445 ||
446 ( level <= 0 )
447 ||
448 assume_clean
449 )
450 info.array.state = 1; /* clean, but one+ drive will be missing*/
451 else
452 info.array.state = 0; /* not clean, but no errors */
453
454 if (level == 10) {
455 /* for raid10, the bitmap size is the capacity of the array,
456 * which is array.size * raid_disks / ncopies;
457 * .. but convert to sectors.
458 */
459 int ncopies = ((layout>>8) & 255) * (layout & 255);
460 bitmapsize = (unsigned long long)size * raiddisks / ncopies * 2;
461 /* printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, size, raiddisks, ncopies);*/
462 } else
463 bitmapsize = (unsigned long long)size * 2;
464
465 /* There is lots of redundancy in these disk counts,
466 * raid_disks is the most meaningful value
467 * it describes the geometry of the array
468 * it is constant
469 * nr_disks is total number of used slots.
470 * it should be raid_disks+spare_disks
471 * spare_disks is the number of extra disks present
472 * see above
473 * active_disks is the number of working disks in
474 * active slots. (With raid_disks)
475 * working_disks is the total number of working disks,
476 * including spares
477 * failed_disks is the number of disks marked failed
478 *
479 * Ideally, the kernel would keep these (except raid_disks)
480 * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
481 * So for now, we assume that all raid and spare
482 * devices will be given.
483 */
484 info.array.spare_disks=sparedisks;
485 info.array.failed_disks=missing_disks;
486 info.array.nr_disks = info.array.working_disks
487 + info.array.failed_disks;
488 info.array.layout = layout;
489 info.array.chunk_size = chunk*1024;
490
491 if (name == NULL || *name == 0) {
492 /* base name on mddev */
493 /* /dev/md0 -> 0
494 * /dev/md_d0 -> d0
495 * /dev/md/1 -> 1
496 * /dev/md/d1 -> d1
497 * /dev/md/home -> home
498 * /dev/mdhome -> home
499 */
500 name = strrchr(mddev, '/');
501 if (name) {
502 name++;
503 if (strncmp(name, "md_d", 4)==0 &&
504 strlen(name) > 4 &&
505 isdigit(name[4]) &&
506 (name-mddev) == 5 /* /dev/ */)
507 name += 3;
508 else if (strncmp(name, "md", 2)==0 &&
509 strlen(name) > 2 &&
510 isdigit(name[2]) &&
511 (name-mddev) == 5 /* /dev/ */)
512 name += 2;
513 }
514 }
515 if (!st->ss->init_super(st, &info.array, size, name, homehost, uuid))
516 return 1;
517
518 total_slots = info.array.nr_disks;
519 st->ss->getinfo_super(st, &info);
520
521 if (did_default)
522 fprintf(stderr, Name ": Defaulting to version"
523 " %s metadata\n", info.text_version);
524
525 if (bitmap_file && vers < 9003) {
526 major_num = BITMAP_MAJOR_HOSTENDIAN;
527 #ifdef __BIG_ENDIAN
528 fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
529 " between different architectured. Consider upgrading the Linux kernel.\n");
530 #endif
531 }
532
533 if (bitmap_file && strcmp(bitmap_file, "internal")==0) {
534 if ((vers%100) < 2) {
535 fprintf(stderr, Name ": internal bitmaps not supported by this kernel.\n");
536 return 1;
537 }
538 if (!st->ss->add_internal_bitmap(st, &bitmap_chunk,
539 delay, write_behind,
540 bitmapsize, 1, major_num)) {
541 fprintf(stderr, Name ": Given bitmap chunk size not supported.\n");
542 return 1;
543 }
544 bitmap_file = NULL;
545 }
546
547
548 sra = sysfs_read(mdfd, 0, 0);
549
550 if (st->ss->external) {
551 char ver[100];
552 strcat(strcpy(ver, "external:"),
553 info.text_version);
554 if (st->ss->external && st->subarray[0]) {
555 /* member */
556
557 /* When creating a member, we need to be careful
558 * to negotiate with mdmon properly.
559 * If it is already running, we cannot write to
560 * the devices and must ask it to do that part.
561 * If it isn't running, we write to the devices,
562 * and then start it.
563 * We hold an exclusive open on the container
564 * device to make sure mdmon doesn't exit after
565 * we checked that it is running.
566 *
567 * For now, fail if it is already running.
568 */
569 container_fd = open_dev_excl(st->container_dev);
570 if (container_fd < 0) {
571 fprintf(stderr, Name ": Cannot get exclusive "
572 "open on container - weird.\n");
573 return 1;
574 }
575 if (mdmon_running(st->container_dev)) {
576 if (verbose)
577 fprintf(stderr, Name ": reusing mdmon "
578 "for %s.\n",
579 devnum2devname(st->container_dev));
580 st->update_tail = &st->updates;
581 } else
582 need_mdmon = 1;
583 }
584 if ((vers % 100) < 2 ||
585 sra == NULL ||
586 sysfs_set_str(sra, NULL, "metadata_version",
587 ver) < 0) {
588 fprintf(stderr, Name ": This kernel does not "
589 "support external metadata.\n");
590 return 1;
591 }
592 rv = sysfs_set_array(sra, &info);
593 } else if ((vers % 100) >= 1) { /* can use different versions */
594 mdu_array_info_t inf;
595 memset(&inf, 0, sizeof(inf));
596 inf.major_version = info.array.major_version;
597 inf.minor_version = info.array.minor_version;
598 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
599 } else
600 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
601 if (rv) {
602 fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
603 mddev, strerror(errno));
604 return 1;
605 }
606
607 if (bitmap_file) {
608 int uuid[4];
609
610 st->ss->uuid_from_super(st, uuid);
611 if (CreateBitmap(bitmap_file, force, (char*)uuid, bitmap_chunk,
612 delay, write_behind,
613 bitmapsize,
614 major_num)) {
615 return 1;
616 }
617 bitmap_fd = open(bitmap_file, O_RDWR);
618 if (bitmap_fd < 0) {
619 fprintf(stderr, Name ": weird: %s cannot be openned\n",
620 bitmap_file);
621 return 1;
622 }
623 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
624 fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
625 mddev, strerror(errno));
626 return 1;
627 }
628 }
629
630 infos = malloc(sizeof(*infos) * total_slots);
631
632 for (pass=1; pass <=2 ; pass++) {
633 mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
634
635 for (dnum=0, dv = devlist ; dv ;
636 dv=(dv->next)?(dv->next):moved_disk, dnum++) {
637 int fd;
638 struct stat stb;
639 struct mdinfo *inf = &infos[dnum];
640
641 if (dnum >= total_slots)
642 abort();
643 if (dnum == insert_point) {
644 moved_disk = dv;
645 }
646 if (dnum == insert_point ||
647 strcasecmp(dv->devname, "missing")==0)
648 continue;
649
650 switch(pass) {
651 case 1:
652 *inf = info;
653
654 inf->disk.number = dnum;
655 inf->disk.raid_disk = dnum;
656 if (inf->disk.raid_disk < raiddisks)
657 inf->disk.state = (1<<MD_DISK_ACTIVE) |
658 (1<<MD_DISK_SYNC);
659 else
660 inf->disk.state = 0;
661
662 if (dv->writemostly)
663 inf->disk.state |= (1<<MD_DISK_WRITEMOSTLY);
664
665 if (st->ss->external && st->subarray[0])
666 fd = open(dv->devname, O_RDWR, 0);
667 else
668 fd = open(dv->devname, O_RDWR|O_EXCL,0);
669
670 if (fd < 0) {
671 fprintf(stderr, Name ": failed to open %s "
672 "after earlier success - aborting\n",
673 dv->devname);
674 return 1;
675 }
676 fstat(fd, &stb);
677 inf->disk.major = major(stb.st_rdev);
678 inf->disk.minor = minor(stb.st_rdev);
679
680 remove_partitions(fd);
681 st->ss->add_to_super(st, &inf->disk,
682 fd, dv->devname);
683 st->ss->getinfo_super(st, inf);
684
685 /* getinfo_super might have lost these ... */
686 inf->disk.major = major(stb.st_rdev);
687 inf->disk.minor = minor(stb.st_rdev);
688 break;
689 case 2:
690 inf->errors = 0;
691 rv = 0;
692
693 if (st->ss->external)
694 rv = sysfs_add_disk(sra, inf);
695 else
696 rv = ioctl(mdfd, ADD_NEW_DISK,
697 &inf->disk);
698
699 if (rv) {
700 fprintf(stderr,
701 Name ": ADD_NEW_DISK for %s "
702 "failed: %s\n",
703 dv->devname, strerror(errno));
704 st->ss->free_super(st);
705 return 1;
706 }
707 break;
708 }
709 if (dv == moved_disk && dnum != insert_point) break;
710 }
711 if (pass == 1) {
712 st->ss->write_init_super(st);
713 flush_metadata_updates(st);
714 }
715 }
716 free(infos);
717 st->ss->free_super(st);
718
719 /* param is not actually used */
720 if (level == LEVEL_CONTAINER)
721 /* No need to start */
722 ;
723 else if (runstop == 1 || subdevs >= raiddisks) {
724 if (st->ss->external) {
725 switch(level) {
726 case LEVEL_LINEAR:
727 case LEVEL_MULTIPATH:
728 case 0:
729 sysfs_set_str(sra, NULL, "array_state",
730 "active");
731 need_mdmon = 0;
732 break;
733 default:
734 sysfs_set_str(sra, NULL, "array_state",
735 "readonly");
736 break;
737 }
738 } else {
739 mdu_param_t param;
740 if (ioctl(mdfd, RUN_ARRAY, &param)) {
741 fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
742 strerror(errno));
743 Manage_runstop(mddev, mdfd, -1, 0);
744 return 1;
745 }
746 }
747 if (verbose >= 0)
748 fprintf(stderr, Name ": array %s started.\n", mddev);
749 if (st->ss->external && st->subarray[0]) {
750 if (need_mdmon) {
751 int dn = st->container_dev;
752 int i;
753 switch(fork()) {
754 case 0:
755 /* FIXME yuk. CLOSE_EXEC?? */
756 for (i=3; i < 100; i++)
757 close(i);
758 execl("./mdmon", "mdmon",
759 map_dev(dev2major(dn),
760 dev2minor(dn),
761 1), NULL);
762 exit(1);
763 case -1: fprintf(stderr, Name ": cannot fork. "
764 "Array remains readonly\n");
765 return 1;
766 default: ; /* parent - good */
767 }
768 } else
769 signal_mdmon(st->container_dev);
770 /* FIXME wait for mdmon to set array to read-auto */
771 sleep(1);
772 close(container_fd);
773 }
774 } else {
775 fprintf(stderr, Name ": not starting array - not enough devices.\n");
776 }
777 return 0;
778 }
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