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[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, verbose>=0))
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 verbose > 0))
286 st = NULL;
287 }
288
289 if (!st) {
290 fprintf(stderr, Name ": device %s not suitable "
291 "for any style of array\n",
292 dname);
293 exit(2);
294 }
295 if (st->ss != &super0 ||
296 st->minor_version != 90)
297 did_default = 1;
298 } else {
299 if (!st->ss->validate_geometry(st, level, layout,
300 raiddisks,
301 chunk, size, dname,
302 &freesize,
303 verbose > 0)) {
304
305 fprintf(stderr,
306 Name ": %s is not suitable for "
307 "this array.\n",
308 dname);
309 fail = 1;
310 continue;
311 }
312 }
313
314 freesize /= 2; /* convert to K */
315 if (chunk) {
316 /* round to chunk size */
317 freesize = freesize & ~(chunk-1);
318 }
319
320 if (size && freesize < size) {
321 fprintf(stderr, Name ": %s is smaller that given size."
322 " %lluK < %lluK + metadata\n",
323 dname, freesize, size);
324 fail = 1;
325 continue;
326 }
327 if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
328 maxdisc = dname;
329 maxsize = freesize;
330 }
331 if (mindisc ==NULL || (mindisc && freesize < minsize)) {
332 mindisc = dname;
333 minsize = freesize;
334 }
335 if (runstop != 1 || verbose >= 0) {
336 int fd = open(dname, O_RDONLY, 0);
337 if (fd <0 ) {
338 fprintf(stderr, Name ": Cannot open %s: %s\n",
339 dname, strerror(errno));
340 fail=1;
341 continue;
342 }
343 warn |= check_ext2(fd, dname);
344 warn |= check_reiser(fd, dname);
345 warn |= check_raid(fd, dname);
346 close(fd);
347 }
348 }
349 if (fail) {
350 fprintf(stderr, Name ": create aborted\n");
351 return 1;
352 }
353 if (size == 0) {
354 if (mindisc == NULL && !have_container) {
355 fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
356 return 1;
357 }
358 if (level > 0 || level == LEVEL_MULTIPATH
359 || level == LEVEL_FAULTY
360 || st->ss->external ) {
361 /* size is meaningful */
362 if (!st->ss->validate_geometry(st, level, layout,
363 raiddisks,
364 chunk, minsize,
365 NULL, NULL, 0)) {
366 fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
367 return 1;
368 }
369 size = minsize;
370 if (verbose > 0)
371 fprintf(stderr, Name ": size set to %lluK\n", size);
372 }
373 }
374 if (level > 0 && ((maxsize-size)*100 > maxsize)) {
375 if (runstop != 1 || verbose >= 0)
376 fprintf(stderr, Name ": largest drive (%s) exceed size (%lluK) by more than 1%%\n",
377 maxdisc, size);
378 warn = 1;
379 }
380
381 if (warn) {
382 if (runstop!= 1) {
383 if (!ask("Continue creating array? ")) {
384 fprintf(stderr, Name ": create aborted.\n");
385 return 1;
386 }
387 } else {
388 if (verbose > 0)
389 fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
390 }
391 }
392
393 /* If this is raid4/5, we want to configure the last active slot
394 * as missing, so that a reconstruct happens (faster than re-parity)
395 * FIX: Can we do this for raid6 as well?
396 */
397 if (assume_clean==0 && force == 0 && first_missing >= raiddisks) {
398 switch ( level ) {
399 case 4:
400 case 5:
401 insert_point = raiddisks-1;
402 sparedisks++;
403 info.array.active_disks--;
404 missing_disks++;
405 break;
406 default:
407 break;
408 }
409 }
410 /* For raid6, if creating with 1 missing drive, make a good drive
411 * into a spare, else the create will fail
412 */
413 if (assume_clean == 0 && force == 0 && first_missing < raiddisks &&
414 second_missing >= raiddisks && level == 6) {
415 insert_point = raiddisks - 1;
416 if (insert_point == first_missing)
417 insert_point--;
418 sparedisks ++;
419 info.array.active_disks--;
420 missing_disks++;
421 }
422
423 if (level <= 0 && first_missing < subdevs * 2) {
424 fprintf(stderr,
425 Name ": This level does not support missing devices\n");
426 return 1;
427 }
428
429 /* Ok, lets try some ioctls */
430
431 info.array.level = level;
432 info.array.size = size;
433 info.array.raid_disks = raiddisks;
434 /* The kernel should *know* what md_minor we are dealing
435 * with, but it chooses to trust me instead. Sigh
436 */
437 info.array.md_minor = 0;
438 if (fstat(mdfd, &stb)==0)
439 info.array.md_minor = minor(stb.st_rdev);
440 info.array.not_persistent = 0;
441
442 if ( ( (level == 4 || level == 5) &&
443 (insert_point < raiddisks || first_missing < raiddisks) )
444 ||
445 ( level == 6 && (insert_point < raiddisks
446 || second_missing < raiddisks))
447 ||
448 ( level <= 0 )
449 ||
450 assume_clean
451 )
452 info.array.state = 1; /* clean, but one+ drive will be missing*/
453 else
454 info.array.state = 0; /* not clean, but no errors */
455
456 if (level == 10) {
457 /* for raid10, the bitmap size is the capacity of the array,
458 * which is array.size * raid_disks / ncopies;
459 * .. but convert to sectors.
460 */
461 int ncopies = ((layout>>8) & 255) * (layout & 255);
462 bitmapsize = (unsigned long long)size * raiddisks / ncopies * 2;
463 /* printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, size, raiddisks, ncopies);*/
464 } else
465 bitmapsize = (unsigned long long)size * 2;
466
467 /* There is lots of redundancy in these disk counts,
468 * raid_disks is the most meaningful value
469 * it describes the geometry of the array
470 * it is constant
471 * nr_disks is total number of used slots.
472 * it should be raid_disks+spare_disks
473 * spare_disks is the number of extra disks present
474 * see above
475 * active_disks is the number of working disks in
476 * active slots. (With raid_disks)
477 * working_disks is the total number of working disks,
478 * including spares
479 * failed_disks is the number of disks marked failed
480 *
481 * Ideally, the kernel would keep these (except raid_disks)
482 * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
483 * So for now, we assume that all raid and spare
484 * devices will be given.
485 */
486 info.array.spare_disks=sparedisks;
487 info.array.failed_disks=missing_disks;
488 info.array.nr_disks = info.array.working_disks
489 + info.array.failed_disks;
490 info.array.layout = layout;
491 info.array.chunk_size = chunk*1024;
492
493 if (name == NULL || *name == 0) {
494 /* base name on mddev */
495 /* /dev/md0 -> 0
496 * /dev/md_d0 -> d0
497 * /dev/md/1 -> 1
498 * /dev/md/d1 -> d1
499 * /dev/md/home -> home
500 * /dev/mdhome -> home
501 */
502 name = strrchr(mddev, '/');
503 if (name) {
504 name++;
505 if (strncmp(name, "md_d", 4)==0 &&
506 strlen(name) > 4 &&
507 isdigit(name[4]) &&
508 (name-mddev) == 5 /* /dev/ */)
509 name += 3;
510 else if (strncmp(name, "md", 2)==0 &&
511 strlen(name) > 2 &&
512 isdigit(name[2]) &&
513 (name-mddev) == 5 /* /dev/ */)
514 name += 2;
515 }
516 }
517 if (!st->ss->init_super(st, &info.array, size, name, homehost, uuid))
518 return 1;
519
520 total_slots = info.array.nr_disks;
521 st->ss->getinfo_super(st, &info);
522
523 if (did_default)
524 fprintf(stderr, Name ": Defaulting to version"
525 " %s metadata\n", info.text_version);
526
527 if (bitmap_file && vers < 9003) {
528 major_num = BITMAP_MAJOR_HOSTENDIAN;
529 #ifdef __BIG_ENDIAN
530 fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
531 " between different architectured. Consider upgrading the Linux kernel.\n");
532 #endif
533 }
534
535 if (bitmap_file && strcmp(bitmap_file, "internal")==0) {
536 if ((vers%100) < 2) {
537 fprintf(stderr, Name ": internal bitmaps not supported by this kernel.\n");
538 return 1;
539 }
540 if (!st->ss->add_internal_bitmap(st, &bitmap_chunk,
541 delay, write_behind,
542 bitmapsize, 1, major_num)) {
543 fprintf(stderr, Name ": Given bitmap chunk size not supported.\n");
544 return 1;
545 }
546 bitmap_file = NULL;
547 }
548
549
550 sra = sysfs_read(mdfd, 0, 0);
551
552 if (st->ss->external) {
553 char ver[100];
554 strcat(strcpy(ver, "external:"),
555 info.text_version);
556 if (st->ss->external && st->subarray[0]) {
557 /* member */
558
559 /* When creating a member, we need to be careful
560 * to negotiate with mdmon properly.
561 * If it is already running, we cannot write to
562 * the devices and must ask it to do that part.
563 * If it isn't running, we write to the devices,
564 * and then start it.
565 * We hold an exclusive open on the container
566 * device to make sure mdmon doesn't exit after
567 * we checked that it is running.
568 *
569 * For now, fail if it is already running.
570 */
571 container_fd = open_dev_excl(st->container_dev);
572 if (container_fd < 0) {
573 fprintf(stderr, Name ": Cannot get exclusive "
574 "open on container - weird.\n");
575 return 1;
576 }
577 if (mdmon_running(st->container_dev)) {
578 if (verbose)
579 fprintf(stderr, Name ": reusing mdmon "
580 "for %s.\n",
581 devnum2devname(st->container_dev));
582 st->update_tail = &st->updates;
583 } else
584 need_mdmon = 1;
585 }
586 if ((vers % 100) < 2 ||
587 sra == NULL ||
588 sysfs_set_str(sra, NULL, "metadata_version",
589 ver) < 0) {
590 fprintf(stderr, Name ": This kernel does not "
591 "support external metadata.\n");
592 return 1;
593 }
594 rv = sysfs_set_array(sra, &info);
595 } else if ((vers % 100) >= 1) { /* can use different versions */
596 mdu_array_info_t inf;
597 memset(&inf, 0, sizeof(inf));
598 inf.major_version = info.array.major_version;
599 inf.minor_version = info.array.minor_version;
600 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
601 } else
602 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
603 if (rv) {
604 fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
605 mddev, strerror(errno));
606 return 1;
607 }
608
609 if (bitmap_file) {
610 int uuid[4];
611
612 st->ss->uuid_from_super(st, uuid);
613 if (CreateBitmap(bitmap_file, force, (char*)uuid, bitmap_chunk,
614 delay, write_behind,
615 bitmapsize,
616 major_num)) {
617 return 1;
618 }
619 bitmap_fd = open(bitmap_file, O_RDWR);
620 if (bitmap_fd < 0) {
621 fprintf(stderr, Name ": weird: %s cannot be openned\n",
622 bitmap_file);
623 return 1;
624 }
625 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
626 fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
627 mddev, strerror(errno));
628 return 1;
629 }
630 }
631
632 infos = malloc(sizeof(*infos) * total_slots);
633
634 for (pass=1; pass <=2 ; pass++) {
635 mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
636
637 for (dnum=0, dv = devlist ; dv ;
638 dv=(dv->next)?(dv->next):moved_disk, dnum++) {
639 int fd;
640 struct stat stb;
641 struct mdinfo *inf = &infos[dnum];
642
643 if (dnum >= total_slots)
644 abort();
645 if (dnum == insert_point) {
646 moved_disk = dv;
647 }
648 if (dnum == insert_point ||
649 strcasecmp(dv->devname, "missing")==0)
650 continue;
651
652 switch(pass) {
653 case 1:
654 *inf = info;
655
656 inf->disk.number = dnum;
657 inf->disk.raid_disk = dnum;
658 if (inf->disk.raid_disk < raiddisks)
659 inf->disk.state = (1<<MD_DISK_ACTIVE) |
660 (1<<MD_DISK_SYNC);
661 else
662 inf->disk.state = 0;
663
664 if (dv->writemostly)
665 inf->disk.state |= (1<<MD_DISK_WRITEMOSTLY);
666
667 if (st->ss->external && st->subarray[0])
668 fd = open(dv->devname, O_RDWR, 0);
669 else
670 fd = open(dv->devname, O_RDWR|O_EXCL,0);
671
672 if (fd < 0) {
673 fprintf(stderr, Name ": failed to open %s "
674 "after earlier success - aborting\n",
675 dv->devname);
676 return 1;
677 }
678 fstat(fd, &stb);
679 inf->disk.major = major(stb.st_rdev);
680 inf->disk.minor = minor(stb.st_rdev);
681
682 remove_partitions(fd);
683 st->ss->add_to_super(st, &inf->disk,
684 fd, dv->devname);
685 st->ss->getinfo_super(st, inf);
686
687 /* getinfo_super might have lost these ... */
688 inf->disk.major = major(stb.st_rdev);
689 inf->disk.minor = minor(stb.st_rdev);
690 break;
691 case 2:
692 inf->errors = 0;
693 rv = 0;
694
695 if (st->ss->external)
696 rv = sysfs_add_disk(sra, inf);
697 else
698 rv = ioctl(mdfd, ADD_NEW_DISK,
699 &inf->disk);
700
701 if (rv) {
702 fprintf(stderr,
703 Name ": ADD_NEW_DISK for %s "
704 "failed: %s\n",
705 dv->devname, strerror(errno));
706 st->ss->free_super(st);
707 return 1;
708 }
709 break;
710 }
711 if (dv == moved_disk && dnum != insert_point) break;
712 }
713 if (pass == 1) {
714 st->ss->write_init_super(st);
715 flush_metadata_updates(st);
716 }
717 }
718 free(infos);
719 st->ss->free_super(st);
720
721 /* param is not actually used */
722 if (level == LEVEL_CONTAINER)
723 /* No need to start */
724 ;
725 else if (runstop == 1 || subdevs >= raiddisks) {
726 if (st->ss->external) {
727 switch(level) {
728 case LEVEL_LINEAR:
729 case LEVEL_MULTIPATH:
730 case 0:
731 sysfs_set_str(sra, NULL, "array_state",
732 "active");
733 need_mdmon = 0;
734 break;
735 default:
736 sysfs_set_str(sra, NULL, "array_state",
737 "readonly");
738 break;
739 }
740 } else {
741 mdu_param_t param;
742 if (ioctl(mdfd, RUN_ARRAY, &param)) {
743 fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
744 strerror(errno));
745 Manage_runstop(mddev, mdfd, -1, 0);
746 return 1;
747 }
748 }
749 if (verbose >= 0)
750 fprintf(stderr, Name ": array %s started.\n", mddev);
751 if (st->ss->external && st->subarray[0]) {
752 if (need_mdmon) {
753 int dn = st->container_dev;
754 int i;
755 switch(fork()) {
756 case 0:
757 /* FIXME yuk. CLOSE_EXEC?? */
758 for (i=3; i < 100; i++)
759 close(i);
760 execl("./mdmon", "mdmon",
761 map_dev(dev2major(dn),
762 dev2minor(dn),
763 1), NULL);
764 exit(1);
765 case -1: fprintf(stderr, Name ": cannot fork. "
766 "Array remains readonly\n");
767 return 1;
768 default: ; /* parent - good */
769 }
770 } else
771 signal_mdmon(st->container_dev);
772 /* FIXME wait for mdmon to set array to read-auto */
773 sleep(1);
774 close(container_fd);
775 }
776 } else {
777 fprintf(stderr, Name ": not starting array - not enough devices.\n");
778 }
779 return 0;
780 }
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