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Fix RAID metadata check
[thirdparty/mdadm.git] / Create.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
25 #include "mdadm.h"
26 #include "md_u.h"
27 #include "md_p.h"
28 #include <ctype.h>
29
30 static int default_layout(struct supertype *st, int level, int verbose)
31 {
32 int layout = UnSet;
33
34 if (st && st->ss->default_geometry)
35 st->ss->default_geometry(st, &level, &layout, NULL);
36
37 if (layout == UnSet)
38 switch(level) {
39 default: /* no layout */
40 layout = 0;
41 break;
42 case 10:
43 layout = 0x102; /* near=2, far=1 */
44 if (verbose > 0)
45 pr_err("layout defaults to n2\n");
46 break;
47 case 5:
48 case 6:
49 layout = map_name(r5layout, "default");
50 if (verbose > 0)
51 pr_err("layout defaults to %s\n", map_num(r5layout, layout));
52 break;
53 case LEVEL_FAULTY:
54 layout = map_name(faultylayout, "default");
55
56 if (verbose > 0)
57 pr_err("layout defaults to %s\n", map_num(faultylayout, layout));
58 break;
59 }
60
61 return layout;
62 }
63
64 int Create(struct supertype *st, char *mddev,
65 char *name, int *uuid,
66 int subdevs, struct mddev_dev *devlist,
67 struct shape *s,
68 struct context *c, unsigned long long data_offset)
69 {
70 /*
71 * Create a new raid array.
72 *
73 * First check that necessary details are available
74 * (i.e. level, raid-disks)
75 *
76 * Then check each disk to see what might be on it
77 * and report anything interesting.
78 *
79 * If anything looks odd, and runstop not set,
80 * abort.
81 *
82 * SET_ARRAY_INFO and ADD_NEW_DISK, and
83 * if runstop==run, or raiddisks disks were used,
84 * RUN_ARRAY
85 */
86 int mdfd;
87 unsigned long long minsize=0, maxsize=0;
88 char *mindisc = NULL;
89 char *maxdisc = NULL;
90 int dnum, raid_disk_num;
91 struct mddev_dev *dv;
92 int fail=0, warn=0;
93 struct stat stb;
94 int first_missing = subdevs * 2;
95 int second_missing = subdevs * 2;
96 int missing_disks = 0;
97 int insert_point = subdevs * 2; /* where to insert a missing drive */
98 int total_slots;
99 int pass;
100 int vers;
101 int rv;
102 int bitmap_fd;
103 int have_container = 0;
104 int container_fd = -1;
105 int need_mdmon = 0;
106 unsigned long long bitmapsize;
107 struct mdinfo info, *infos;
108 int did_default = 0;
109 int do_default_layout = 0;
110 int do_default_chunk = 0;
111 unsigned long safe_mode_delay = 0;
112 char chosen_name[1024];
113 struct map_ent *map = NULL;
114 unsigned long long newsize;
115
116 int major_num = BITMAP_MAJOR_HI;
117 if (s->bitmap_file && strcmp(s->bitmap_file, "clustered") == 0) {
118 major_num = BITMAP_MAJOR_CLUSTERED;
119 if (c->nodes <= 1) {
120 pr_err("At least 2 nodes are needed for cluster-md\n");
121 return 1;
122 }
123 }
124
125 memset(&info, 0, sizeof(info));
126 if (s->level == UnSet && st && st->ss->default_geometry)
127 st->ss->default_geometry(st, &s->level, NULL, NULL);
128 if (s->level == UnSet) {
129 pr_err("a RAID level is needed to create an array.\n");
130 return 1;
131 }
132 if (s->raiddisks < 4 && s->level == 6) {
133 pr_err("at least 4 raid-devices needed for level 6\n");
134 return 1;
135 }
136 if (s->raiddisks > 256 && s->level == 6) {
137 pr_err("no more than 256 raid-devices supported for level 6\n");
138 return 1;
139 }
140 if (s->raiddisks < 2 && s->level >= 4) {
141 pr_err("at least 2 raid-devices needed for level 4 or 5\n");
142 return 1;
143 }
144 if (s->level <= 0 && s->sparedisks) {
145 pr_err("This level does not support spare devices\n");
146 return 1;
147 }
148
149 if (subdevs == 1 && strcmp(devlist->devname, "missing") != 0) {
150 /* If given a single device, it might be a container, and we can
151 * extract a device list from there
152 */
153 mdu_array_info_t inf;
154 int fd;
155
156 memset(&inf, 0, sizeof(inf));
157 fd = open(devlist->devname, O_RDONLY);
158 if (fd >= 0 &&
159 ioctl(fd, GET_ARRAY_INFO, &inf) == 0 &&
160 inf.raid_disks == 0) {
161 /* yep, looks like a container */
162 if (st) {
163 rv = st->ss->load_container(st, fd,
164 devlist->devname);
165 if (rv == 0)
166 have_container = 1;
167 } else {
168 st = super_by_fd(fd, NULL);
169 if (st && !(rv = st->ss->
170 load_container(st, fd,
171 devlist->devname)))
172 have_container = 1;
173 else
174 st = NULL;
175 }
176 if (have_container) {
177 subdevs = s->raiddisks;
178 first_missing = subdevs * 2;
179 second_missing = subdevs * 2;
180 insert_point = subdevs * 2;
181 }
182 }
183 if (fd >= 0)
184 close(fd);
185 }
186 if (st && st->ss->external && s->sparedisks) {
187 pr_err("This metadata type does not support spare disks at create time\n");
188 return 1;
189 }
190 if (subdevs > s->raiddisks+s->sparedisks+s->journaldisks) {
191 pr_err("You have listed more devices (%d) than are in the array(%d)!\n", subdevs, s->raiddisks+s->sparedisks);
192 return 1;
193 }
194 if (!have_container && subdevs < s->raiddisks+s->sparedisks+s->journaldisks) {
195 pr_err("You haven't given enough devices (real or missing) to create this array\n");
196 return 1;
197 }
198 if (s->bitmap_file && s->level <= 0) {
199 pr_err("bitmaps not meaningful with level %s\n",
200 map_num(pers, s->level)?:"given");
201 return 1;
202 }
203
204 /* now set some defaults */
205
206 if (s->layout == UnSet) {
207 do_default_layout = 1;
208 s->layout = default_layout(st, s->level, c->verbose);
209 }
210
211 if (s->level == 10)
212 /* check layout fits in array*/
213 if ((s->layout&255) * ((s->layout>>8)&255) > s->raiddisks) {
214 pr_err("that layout requires at least %d devices\n",
215 (s->layout&255) * ((s->layout>>8)&255));
216 return 1;
217 }
218
219 switch(s->level) {
220 case 4:
221 case 5:
222 case 10:
223 case 6:
224 case 0:
225 if (s->chunk == 0 || s->chunk == UnSet) {
226 s->chunk = UnSet;
227 do_default_chunk = 1;
228 /* chunk will be set later */
229 }
230 break;
231 case LEVEL_LINEAR:
232 /* a chunksize of zero 0s perfectly valid (and preferred) since 2.6.16 */
233 if (get_linux_version() < 2006016 && s->chunk == 0) {
234 s->chunk = 64;
235 if (c->verbose > 0)
236 pr_err("chunk size defaults to 64K\n");
237 }
238 break;
239 case 1:
240 case LEVEL_FAULTY:
241 case LEVEL_MULTIPATH:
242 case LEVEL_CONTAINER:
243 if (s->chunk) {
244 s->chunk = 0;
245 if (c->verbose > 0)
246 pr_err("chunk size ignored for this level\n");
247 }
248 break;
249 default:
250 pr_err("unknown level %d\n", s->level);
251 return 1;
252 }
253 if (s->size == MAX_SIZE)
254 /* use '0' to mean 'max' now... */
255 s->size = 0;
256 if (s->size && s->chunk && s->chunk != UnSet)
257 s->size &= ~(unsigned long long)(s->chunk - 1);
258 newsize = s->size * 2;
259 if (st && ! st->ss->validate_geometry(st, s->level, s->layout, s->raiddisks,
260 &s->chunk, s->size*2,
261 data_offset, NULL,
262 &newsize, c->verbose>=0))
263 return 1;
264
265 if (s->chunk && s->chunk != UnSet) {
266 newsize &= ~(unsigned long long)(s->chunk*2 - 1);
267 if (do_default_chunk) {
268 /* default chunk was just set */
269 if (c->verbose > 0)
270 pr_err("chunk size defaults to %dK\n", s->chunk);
271 s->size &= ~(unsigned long long)(s->chunk - 1);
272 do_default_chunk = 0;
273 }
274 }
275
276 if (s->size == 0) {
277 s->size = newsize / 2;
278 if (s->level == 1)
279 /* If this is ever reshaped to RAID5, we will
280 * need a chunksize. So round it off a bit
281 * now just to be safe
282 */
283 s->size &= ~(64ULL-1);
284
285 if (s->size && c->verbose > 0)
286 pr_err("setting size to %lluK\n", s->size);
287 }
288
289 /* now look at the subdevs */
290 info.array.active_disks = 0;
291 info.array.working_disks = 0;
292 dnum = 0;
293 for (dv = devlist; dv ; dv = dv->next)
294 if (data_offset == VARIABLE_OFFSET)
295 dv->data_offset = INVALID_SECTORS;
296 else
297 dv->data_offset = data_offset;
298
299 for (dv=devlist; dv && !have_container; dv=dv->next, dnum++) {
300 char *dname = dv->devname;
301 unsigned long long freesize;
302 int dfd;
303 char *doff;
304
305 if (strcasecmp(dname, "missing")==0) {
306 if (first_missing > dnum)
307 first_missing = dnum;
308 if (second_missing > dnum && dnum > first_missing)
309 second_missing = dnum;
310 missing_disks ++;
311 continue;
312 }
313 if (data_offset == VARIABLE_OFFSET) {
314 doff = strchr(dname, ':');
315 if (doff) {
316 *doff++ = 0;
317 dv->data_offset = parse_size(doff);
318 } else
319 dv->data_offset = INVALID_SECTORS;
320 } else
321 dv->data_offset = data_offset;
322
323 dfd = open(dname, O_RDONLY);
324 if (dfd < 0) {
325 pr_err("cannot open %s: %s\n",
326 dname, strerror(errno));
327 exit(2);
328 }
329 if (fstat(dfd, &stb) != 0 ||
330 (stb.st_mode & S_IFMT) != S_IFBLK) {
331 close(dfd);
332 pr_err("%s is not a block device\n",
333 dname);
334 exit(2);
335 }
336 close(dfd);
337 info.array.working_disks++;
338 if (dnum < s->raiddisks && dv->disposition != 'j')
339 info.array.active_disks++;
340 if (st == NULL) {
341 struct createinfo *ci = conf_get_create_info();
342 if (ci)
343 st = ci->supertype;
344 }
345 if (st == NULL) {
346 /* Need to choose a default metadata, which is different
347 * depending on geometry of array.
348 */
349 int i;
350 char *name = "default";
351 for(i=0; !st && superlist[i]; i++) {
352 st = superlist[i]->match_metadata_desc(name);
353 if (!st)
354 continue;
355 if (do_default_layout)
356 s->layout = default_layout(st, s->level, c->verbose);
357 switch (st->ss->validate_geometry(
358 st, s->level, s->layout, s->raiddisks,
359 &s->chunk, s->size*2,
360 dv->data_offset, dname,
361 &freesize, c->verbose > 0)) {
362 case -1: /* Not valid, message printed, and not
363 * worth checking any further */
364 exit(2);
365 break;
366 case 0: /* Geometry not valid */
367 free(st);
368 st = NULL;
369 s->chunk = do_default_chunk ? UnSet : s->chunk;
370 break;
371 case 1: /* All happy */
372 break;
373 }
374 }
375
376 if (!st) {
377 int dfd = open(dname, O_RDONLY|O_EXCL);
378 if (dfd < 0) {
379 pr_err("cannot open %s: %s\n",
380 dname, strerror(errno));
381 exit(2);
382 }
383 pr_err("device %s not suitable for any style of array\n",
384 dname);
385 exit(2);
386 }
387 if (st->ss != &super0 ||
388 st->minor_version != 90)
389 did_default = 1;
390 } else {
391 if (do_default_layout)
392 s->layout = default_layout(st, s->level, 0);
393 if (!st->ss->validate_geometry(st, s->level, s->layout,
394 s->raiddisks,
395 &s->chunk, s->size*2,
396 dv->data_offset,
397 dname, &freesize,
398 c->verbose >= 0)) {
399
400 pr_err("%s is not suitable for this array.\n",
401 dname);
402 fail = 1;
403 continue;
404 }
405 }
406
407 if (dv->disposition == 'j')
408 goto skip_size_check; /* skip write journal for size check */
409
410 freesize /= 2; /* convert to K */
411 if (s->chunk && s->chunk != UnSet) {
412 /* round to chunk size */
413 freesize = freesize & ~(s->chunk-1);
414 if (do_default_chunk) {
415 /* default chunk was just set */
416 if (c->verbose > 0)
417 pr_err("chunk size defaults to %dK\n", s->chunk);
418 s->size &= ~(unsigned long long)(s->chunk - 1);
419 do_default_chunk = 0;
420 }
421 }
422 if (!freesize) {
423 pr_err("no free space left on %s\n", dname);
424 fail = 1;
425 continue;
426 }
427
428 if (s->size && freesize < s->size) {
429 pr_err("%s is smaller than given size. %lluK < %lluK + metadata\n",
430 dname, freesize, s->size);
431 fail = 1;
432 continue;
433 }
434 if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
435 maxdisc = dname;
436 maxsize = freesize;
437 }
438 if (mindisc ==NULL || (mindisc && freesize < minsize)) {
439 mindisc = dname;
440 minsize = freesize;
441 }
442 skip_size_check:
443 if (c->runstop != 1 || c->verbose >= 0) {
444 int fd = open(dname, O_RDONLY);
445 if (fd <0 ) {
446 pr_err("Cannot open %s: %s\n",
447 dname, strerror(errno));
448 fail=1;
449 continue;
450 }
451 warn |= check_ext2(fd, dname);
452 warn |= check_reiser(fd, dname);
453 warn |= check_raid(fd, dname);
454 if (strcmp(st->ss->name, "1.x") == 0 &&
455 st->minor_version >= 1)
456 /* metadata at front */
457 warn |= check_partitions(fd, dname, 0, 0);
458 else if (s->level == 1 || s->level == LEVEL_CONTAINER
459 || (s->level == 0 && s->raiddisks == 1))
460 /* partitions could be meaningful */
461 warn |= check_partitions(fd, dname, freesize*2, s->size*2);
462 else
463 /* partitions cannot be meaningful */
464 warn |= check_partitions(fd, dname, 0, 0);
465 if (strcmp(st->ss->name, "1.x") == 0 &&
466 st->minor_version >= 1 &&
467 did_default &&
468 s->level == 1 &&
469 (warn & 1024) == 0) {
470 warn |= 1024;
471 pr_err("Note: this array has metadata at the start and\n"
472 " may not be suitable as a boot device. If you plan to\n"
473 " store '/boot' on this device please ensure that\n"
474 " your boot-loader understands md/v1.x metadata, or use\n"
475 " --metadata=0.90\n");
476 }
477 close(fd);
478 }
479 }
480 if (s->raiddisks + s->sparedisks > st->max_devs) {
481 pr_err("Too many devices: %s metadata only supports %d\n",
482 st->ss->name, st->max_devs);
483 return 1;
484 }
485 if (have_container)
486 info.array.working_disks = s->raiddisks;
487 if (fail) {
488 pr_err("create aborted\n");
489 return 1;
490 }
491 if (s->size == 0) {
492 if (mindisc == NULL && !have_container) {
493 pr_err("no size and no drives given - aborting create.\n");
494 return 1;
495 }
496 if (s->level > 0 || s->level == LEVEL_MULTIPATH
497 || s->level == LEVEL_FAULTY
498 || st->ss->external ) {
499 /* size is meaningful */
500 if (!st->ss->validate_geometry(st, s->level, s->layout,
501 s->raiddisks,
502 &s->chunk, minsize*2,
503 data_offset,
504 NULL, NULL, 0)) {
505 pr_err("devices too large for RAID level %d\n", s->level);
506 return 1;
507 }
508 s->size = minsize;
509 if (s->level == 1)
510 /* If this is ever reshaped to RAID5, we will
511 * need a chunksize. So round it off a bit
512 * now just to be safe
513 */
514 s->size &= ~(64ULL-1);
515 if (c->verbose > 0)
516 pr_err("size set to %lluK\n", s->size);
517 }
518 }
519
520 if (!s->bitmap_file &&
521 s->level >= 1 &&
522 st->ss->add_internal_bitmap &&
523 (s->write_behind || s->size > 100*1024*1024ULL)) {
524 if (c->verbose > 0)
525 pr_err("automatically enabling write-intent bitmap on large array\n");
526 s->bitmap_file = "internal";
527 }
528 if (s->bitmap_file && strcmp(s->bitmap_file, "none") == 0)
529 s->bitmap_file = NULL;
530
531 if (!have_container && s->level > 0 && ((maxsize-s->size)*100 > maxsize)) {
532 if (c->runstop != 1 || c->verbose >= 0)
533 pr_err("largest drive (%s) exceeds size (%lluK) by more than 1%%\n",
534 maxdisc, s->size);
535 warn = 1;
536 }
537
538 if (st->ss->detail_platform && st->ss->detail_platform(0, 1, NULL) != 0) {
539 if (c->runstop != 1 || c->verbose >= 0)
540 pr_err("%s unable to enumerate platform support\n"
541 " array may not be compatible with hardware/firmware\n",
542 st->ss->name);
543 warn = 1;
544 }
545 st->nodes = c->nodes;
546 st->cluster_name = c->homecluster;
547
548 if (warn) {
549 if (c->runstop!= 1) {
550 if (!ask("Continue creating array? ")) {
551 pr_err("create aborted.\n");
552 return 1;
553 }
554 } else {
555 if (c->verbose > 0)
556 pr_err("creation continuing despite oddities due to --run\n");
557 }
558 }
559
560 /* If this is raid4/5, we want to configure the last active slot
561 * as missing, so that a reconstruct happens (faster than re-parity)
562 * FIX: Can we do this for raid6 as well?
563 */
564 if (st->ss->external == 0 &&
565 s->assume_clean==0 && c->force == 0 && first_missing >= s->raiddisks) {
566 switch ( s->level ) {
567 case 4:
568 case 5:
569 insert_point = s->raiddisks-1;
570 s->sparedisks++;
571 info.array.active_disks--;
572 missing_disks++;
573 break;
574 default:
575 break;
576 }
577 }
578 /* For raid6, if creating with 1 missing drive, make a good drive
579 * into a spare, else the create will fail
580 */
581 if (s->assume_clean == 0 && c->force == 0 && first_missing < s->raiddisks &&
582 st->ss->external == 0 &&
583 second_missing >= s->raiddisks && s->level == 6) {
584 insert_point = s->raiddisks - 1;
585 if (insert_point == first_missing)
586 insert_point--;
587 s->sparedisks ++;
588 info.array.active_disks--;
589 missing_disks++;
590 }
591
592 if (s->level <= 0 && first_missing < subdevs * 2) {
593 pr_err("This level does not support missing devices\n");
594 return 1;
595 }
596
597 /* We need to create the device */
598 map_lock(&map);
599 mdfd = create_mddev(mddev, name, c->autof, LOCAL, chosen_name);
600 if (mdfd < 0) {
601 map_unlock(&map);
602 return 1;
603 }
604 /* verify if chosen_name is not in use,
605 * it could be in conflict with already existing device
606 * e.g. container, array
607 */
608 if (strncmp(chosen_name, "/dev/md/", 8) == 0
609 && map_by_name(&map, chosen_name+8) != NULL) {
610 pr_err("Array name %s is in use already.\n",
611 chosen_name);
612 close(mdfd);
613 map_unlock(&map);
614 return 1;
615 }
616 mddev = chosen_name;
617
618 vers = md_get_version(mdfd);
619 if (vers < 9000) {
620 pr_err("Create requires md driver version 0.90.0 or later\n");
621 goto abort_locked;
622 } else {
623 mdu_array_info_t inf;
624 memset(&inf, 0, sizeof(inf));
625 ioctl(mdfd, GET_ARRAY_INFO, &inf);
626 if (inf.working_disks != 0) {
627 pr_err("another array by this name is already running.\n");
628 goto abort_locked;
629 }
630 }
631
632 /* Ok, lets try some ioctls */
633
634 info.array.level = s->level;
635 info.array.size = s->size;
636 info.array.raid_disks = s->raiddisks;
637 /* The kernel should *know* what md_minor we are dealing
638 * with, but it chooses to trust me instead. Sigh
639 */
640 info.array.md_minor = 0;
641 if (fstat(mdfd, &stb)==0)
642 info.array.md_minor = minor(stb.st_rdev);
643 info.array.not_persistent = 0;
644
645 if ( ( (s->level == 4 || s->level == 5) &&
646 (insert_point < s->raiddisks || first_missing < s->raiddisks) )
647 ||
648 ( s->level == 6 && (insert_point < s->raiddisks
649 || second_missing < s->raiddisks))
650 ||
651 ( s->level <= 0 )
652 ||
653 s->assume_clean
654 ) {
655 info.array.state = 1; /* clean, but one+ drive will be missing*/
656 info.resync_start = MaxSector;
657 } else {
658 info.array.state = 0; /* not clean, but no errors */
659 info.resync_start = 0;
660 }
661 if (s->level == 10) {
662 /* for raid10, the bitmap size is the capacity of the array,
663 * which is array.size * raid_disks / ncopies;
664 * .. but convert to sectors.
665 */
666 int ncopies = ((s->layout>>8) & 255) * (s->layout & 255);
667 bitmapsize = s->size * s->raiddisks / ncopies * 2;
668 /* printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, s->size, s->raiddisks, ncopies);*/
669 } else
670 bitmapsize = s->size * 2;
671
672 /* There is lots of redundancy in these disk counts,
673 * raid_disks is the most meaningful value
674 * it describes the geometry of the array
675 * it is constant
676 * nr_disks is total number of used slots.
677 * it should be raid_disks+spare_disks
678 * spare_disks is the number of extra disks present
679 * see above
680 * active_disks is the number of working disks in
681 * active slots. (With raid_disks)
682 * working_disks is the total number of working disks,
683 * including spares
684 * failed_disks is the number of disks marked failed
685 *
686 * Ideally, the kernel would keep these (except raid_disks)
687 * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
688 * So for now, we assume that all raid and spare
689 * devices will be given.
690 */
691 info.array.spare_disks=s->sparedisks;
692 info.array.failed_disks=missing_disks;
693 info.array.nr_disks = info.array.working_disks
694 + info.array.failed_disks;
695 info.array.layout = s->layout;
696 info.array.chunk_size = s->chunk*1024;
697
698 if (name == NULL || *name == 0) {
699 /* base name on mddev */
700 /* /dev/md0 -> 0
701 * /dev/md_d0 -> d0
702 * /dev/md_foo -> foo
703 * /dev/md/1 -> 1
704 * /dev/md/d1 -> d1
705 * /dev/md/home -> home
706 * /dev/mdhome -> home
707 */
708 /* FIXME compare this with rules in create_mddev */
709 name = strrchr(mddev, '/');
710 if (name) {
711 name++;
712 if (strncmp(name, "md_", 3)==0 &&
713 strlen(name) > 3 &&
714 (name-mddev) == 5 /* /dev/ */)
715 name += 3;
716 else if (strncmp(name, "md", 2)==0 &&
717 strlen(name) > 2 &&
718 isdigit(name[2]) &&
719 (name-mddev) == 5 /* /dev/ */)
720 name += 2;
721 }
722 }
723 if (!st->ss->init_super(st, &info.array, s->size, name, c->homehost, uuid,
724 data_offset))
725 goto abort_locked;
726
727 total_slots = info.array.nr_disks;
728 st->ss->getinfo_super(st, &info, NULL);
729 sysfs_init(&info, mdfd, NULL);
730
731 if (did_default && c->verbose >= 0) {
732 if (is_subarray(info.text_version)) {
733 char devnm[32];
734 char *ep;
735 struct mdinfo *mdi;
736
737 strncpy(devnm, info.text_version+1, 32);
738 devnm[31] = 0;
739 ep = strchr(devnm, '/');
740 if (ep)
741 *ep = 0;
742
743 mdi = sysfs_read(-1, devnm, GET_VERSION);
744
745 pr_err("Creating array inside %s container %s\n",
746 mdi?mdi->text_version:"managed", devnm);
747 sysfs_free(mdi);
748 } else
749 pr_err("Defaulting to version %s metadata\n", info.text_version);
750 }
751
752 map_update(&map, fd2devnm(mdfd), info.text_version,
753 info.uuid, chosen_name);
754 /* Keep map locked until devices have been added to array
755 * to stop another mdadm from finding and using those devices.
756 */
757
758 if (s->bitmap_file && vers < 9003) {
759 major_num = BITMAP_MAJOR_HOSTENDIAN;
760 #ifdef __BIG_ENDIAN
761 pr_err("Warning - bitmaps created on this kernel are not portable\n"
762 " between different architectured. Consider upgrading the Linux kernel.\n");
763 #endif
764 }
765
766 if (s->bitmap_file && (strcmp(s->bitmap_file, "internal")==0 ||
767 strcmp(s->bitmap_file, "clustered")==0)) {
768 if ((vers%100) < 2) {
769 pr_err("internal bitmaps not supported by this kernel.\n");
770 goto abort_locked;
771 }
772 if (!st->ss->add_internal_bitmap) {
773 pr_err("internal bitmaps not supported with %s metadata\n",
774 st->ss->name);
775 goto abort_locked;
776 }
777 if (st->ss->add_internal_bitmap(st, &s->bitmap_chunk,
778 c->delay, s->write_behind,
779 bitmapsize, 1, major_num)) {
780 pr_err("Given bitmap chunk size not supported.\n");
781 goto abort_locked;
782 }
783 s->bitmap_file = NULL;
784 }
785
786 sysfs_init(&info, mdfd, NULL);
787
788 if (st->ss->external && st->container_devnm[0]) {
789 /* member */
790
791 /* When creating a member, we need to be careful
792 * to negotiate with mdmon properly.
793 * If it is already running, we cannot write to
794 * the devices and must ask it to do that part.
795 * If it isn't running, we write to the devices,
796 * and then start it.
797 * We hold an exclusive open on the container
798 * device to make sure mdmon doesn't exit after
799 * we checked that it is running.
800 *
801 * For now, fail if it is already running.
802 */
803 container_fd = open_dev_excl(st->container_devnm);
804 if (container_fd < 0) {
805 pr_err("Cannot get exclusive open on container - weird.\n");
806 goto abort_locked;
807 }
808 if (mdmon_running(st->container_devnm)) {
809 if (c->verbose)
810 pr_err("reusing mdmon for %s.\n",
811 st->container_devnm);
812 st->update_tail = &st->updates;
813 } else
814 need_mdmon = 1;
815 }
816 rv = set_array_info(mdfd, st, &info);
817 if (rv) {
818 pr_err("failed to set array info for %s: %s\n",
819 mddev, strerror(errno));
820 goto abort_locked;
821 }
822
823 if (s->bitmap_file) {
824 int uuid[4];
825
826 st->ss->uuid_from_super(st, uuid);
827 if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid, s->bitmap_chunk,
828 c->delay, s->write_behind,
829 bitmapsize,
830 major_num)) {
831 goto abort_locked;
832 }
833 bitmap_fd = open(s->bitmap_file, O_RDWR);
834 if (bitmap_fd < 0) {
835 pr_err("weird: %s cannot be openned\n",
836 s->bitmap_file);
837 goto abort_locked;
838 }
839 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
840 pr_err("Cannot set bitmap file for %s: %s\n",
841 mddev, strerror(errno));
842 goto abort_locked;
843 }
844 }
845
846 infos = xmalloc(sizeof(*infos) * total_slots);
847 enable_fds(total_slots);
848 for (pass=1; pass <=2 ; pass++) {
849 struct mddev_dev *moved_disk = NULL; /* the disk that was moved out of the insert point */
850
851 for (dnum=0, raid_disk_num=0, dv = devlist ; dv ;
852 dv=(dv->next)?(dv->next):moved_disk, dnum++) {
853 int fd;
854 struct stat stb;
855 struct mdinfo *inf = &infos[dnum];
856
857 if (dnum >= total_slots)
858 abort();
859 if (dnum == insert_point) {
860 raid_disk_num += 1;
861 moved_disk = dv;
862 continue;
863 }
864 if (strcasecmp(dv->devname, "missing")==0) {
865 raid_disk_num += 1;
866 continue;
867 }
868 if (have_container)
869 moved_disk = NULL;
870 if (have_container && dnum < info.array.raid_disks - 1)
871 /* repeatedly use the container */
872 moved_disk = dv;
873
874 switch(pass) {
875 case 1:
876 *inf = info;
877
878 inf->disk.number = dnum;
879 inf->disk.raid_disk = raid_disk_num++;
880
881 if (dv->disposition == 'j') {
882 inf->disk.raid_disk = MD_DISK_ROLE_JOURNAL;
883 inf->disk.state = (1<<MD_DISK_JOURNAL);
884 raid_disk_num--;
885 } else if (inf->disk.raid_disk < s->raiddisks)
886 inf->disk.state = (1<<MD_DISK_ACTIVE) |
887 (1<<MD_DISK_SYNC);
888 else
889 inf->disk.state = 0;
890
891 if (dv->writemostly == 1)
892 inf->disk.state |= (1<<MD_DISK_WRITEMOSTLY);
893
894 if (have_container)
895 fd = -1;
896 else {
897 if (st->ss->external &&
898 st->container_devnm[0])
899 fd = open(dv->devname, O_RDWR);
900 else
901 fd = open(dv->devname, O_RDWR|O_EXCL);
902
903 if (fd < 0) {
904 pr_err("failed to open %s after earlier success - aborting\n",
905 dv->devname);
906 goto abort_locked;
907 }
908 fstat(fd, &stb);
909 inf->disk.major = major(stb.st_rdev);
910 inf->disk.minor = minor(stb.st_rdev);
911 }
912 if (fd >= 0)
913 remove_partitions(fd);
914 if (st->ss->add_to_super(st, &inf->disk,
915 fd, dv->devname,
916 dv->data_offset)) {
917 ioctl(mdfd, STOP_ARRAY, NULL);
918 goto abort_locked;
919 }
920 st->ss->getinfo_super(st, inf, NULL);
921 safe_mode_delay = inf->safe_mode_delay;
922
923 if (have_container && c->verbose > 0)
924 pr_err("Using %s for device %d\n",
925 map_dev(inf->disk.major,
926 inf->disk.minor,
927 0), dnum);
928
929 if (!have_container) {
930 /* getinfo_super might have lost these ... */
931 inf->disk.major = major(stb.st_rdev);
932 inf->disk.minor = minor(stb.st_rdev);
933 }
934 break;
935 case 2:
936 inf->errors = 0;
937
938 rv = add_disk(mdfd, st, &info, inf);
939
940 if (rv) {
941 pr_err("ADD_NEW_DISK for %s failed: %s\n",
942 dv->devname, strerror(errno));
943 goto abort_locked;
944 }
945 break;
946 }
947 if (!have_container &&
948 dv == moved_disk && dnum != insert_point) break;
949 }
950 if (pass == 1) {
951 struct mdinfo info_new;
952 struct map_ent *me = NULL;
953
954 /* check to see if the uuid has changed due to these
955 * metadata changes, and if so update the member array
956 * and container uuid. Note ->write_init_super clears
957 * the subarray cursor such that ->getinfo_super once
958 * again returns container info.
959 */
960 st->ss->getinfo_super(st, &info_new, NULL);
961 if (st->ss->external && s->level != LEVEL_CONTAINER &&
962 !same_uuid(info_new.uuid, info.uuid, 0)) {
963 map_update(&map, fd2devnm(mdfd),
964 info_new.text_version,
965 info_new.uuid, chosen_name);
966 me = map_by_devnm(&map, st->container_devnm);
967 }
968
969 if (st->ss->write_init_super(st)) {
970 st->ss->free_super(st);
971 goto abort_locked;
972 }
973
974 /* update parent container uuid */
975 if (me) {
976 char *path = xstrdup(me->path);
977
978 st->ss->getinfo_super(st, &info_new, NULL);
979 map_update(&map, st->container_devnm,
980 info_new.text_version,
981 info_new.uuid, path);
982 free(path);
983 }
984
985 flush_metadata_updates(st);
986 st->ss->free_super(st);
987 }
988 }
989 map_unlock(&map);
990 free(infos);
991
992 if (s->level == LEVEL_CONTAINER) {
993 /* No need to start. But we should signal udev to
994 * create links */
995 sysfs_uevent(&info, "change");
996 if (c->verbose >= 0)
997 pr_err("container %s prepared.\n", mddev);
998 wait_for(chosen_name, mdfd);
999 } else if (c->runstop == 1 || subdevs >= s->raiddisks) {
1000 if (st->ss->external) {
1001 int err;
1002 switch(s->level) {
1003 case LEVEL_LINEAR:
1004 case LEVEL_MULTIPATH:
1005 case 0:
1006 err = sysfs_set_str(&info, NULL, "array_state",
1007 c->readonly
1008 ? "readonly"
1009 : "active");
1010 need_mdmon = 0;
1011 break;
1012 default:
1013 err = sysfs_set_str(&info, NULL, "array_state",
1014 "readonly");
1015 break;
1016 }
1017 sysfs_set_safemode(&info, safe_mode_delay);
1018 if (err) {
1019 pr_err("failed to activate array.\n");
1020 ioctl(mdfd, STOP_ARRAY, NULL);
1021 goto abort;
1022 }
1023 } else if (c->readonly &&
1024 sysfs_attribute_available(
1025 &info, NULL, "array_state")) {
1026 if (sysfs_set_str(&info, NULL,
1027 "array_state", "readonly") < 0) {
1028 pr_err("Failed to start array: %s\n",
1029 strerror(errno));
1030 ioctl(mdfd, STOP_ARRAY, NULL);
1031 goto abort;
1032 }
1033 } else {
1034 /* param is not actually used */
1035 mdu_param_t param;
1036 if (ioctl(mdfd, RUN_ARRAY, &param)) {
1037 pr_err("RUN_ARRAY failed: %s\n",
1038 strerror(errno));
1039 if (info.array.chunk_size & (info.array.chunk_size-1)) {
1040 cont_err("Problem may be that chunk size is not a power of 2\n");
1041 }
1042 ioctl(mdfd, STOP_ARRAY, NULL);
1043 goto abort;
1044 }
1045 /* if start_ro module parameter is set, array is
1046 * auto-read-only, which is bad as the resync won't
1047 * start. So lets make it read-write now.
1048 */
1049 ioctl(mdfd, RESTART_ARRAY_RW, NULL);
1050 }
1051 if (c->verbose >= 0)
1052 pr_err("array %s started.\n", mddev);
1053 if (st->ss->external && st->container_devnm[0]) {
1054 if (need_mdmon)
1055 start_mdmon(st->container_devnm);
1056
1057 ping_monitor(st->container_devnm);
1058 close(container_fd);
1059 }
1060 wait_for(chosen_name, mdfd);
1061 } else {
1062 pr_err("not starting array - not enough devices.\n");
1063 }
1064 close(mdfd);
1065 return 0;
1066
1067 abort:
1068 map_lock(&map);
1069 abort_locked:
1070 map_remove(&map, fd2devnm(mdfd));
1071 map_unlock(&map);
1072
1073 if (mdfd >= 0)
1074 close(mdfd);
1075 return 1;
1076 }
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