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[thirdparty/mdadm.git] / Incremental.c
1 /*
2 * Incremental.c - support --incremental. Part of:
3 * mdadm - manage Linux "md" devices aka RAID arrays.
4 *
5 * Copyright (C) 2006-2013 Neil Brown <neilb@suse.de>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * Author: Neil Brown
23 * Email: <neilb@suse.de>
24 * Paper: Neil Brown
25 * Novell Inc
26 * GPO Box Q1283
27 * QVB Post Office, NSW 1230
28 * Australia
29 */
30
31 #include "mdadm.h"
32 #include <sys/wait.h>
33 #include <dirent.h>
34 #include <ctype.h>
35
36 static int count_active(struct supertype *st, struct mdinfo *sra,
37 int mdfd, char **availp,
38 struct mdinfo *info);
39 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
40 int number, __u64 events, int verbose,
41 char *array_name);
42 static int try_spare(char *devname, int *dfdp, struct dev_policy *pol,
43 struct map_ent *target,
44 struct supertype *st, int verbose);
45
46 static int Incremental_container(struct supertype *st, char *devname,
47 struct context *c, char *only);
48
49 int Incremental(struct mddev_dev *devlist, struct context *c,
50 struct supertype *st)
51 {
52 /* Add this device to an array, creating the array if necessary
53 * and starting the array if sensible or - if runstop>0 - if possible.
54 *
55 * This has several steps:
56 *
57 * 1/ Check if device is permitted by mdadm.conf, reject if not.
58 * 2/ Find metadata, reject if none appropriate (check
59 * version/name from args)
60 * 3/ Check if there is a match in mdadm.conf
61 * 3a/ if not, check for homehost match. If no match, assemble as
62 * a 'foreign' array.
63 * 4/ Determine device number.
64 * - If in mdadm.conf with std name, use that
65 * - UUID in /var/run/mdadm.map use that
66 * - If name is suggestive, use that. unless in use with different uuid.
67 * - Choose a free, high number.
68 * - Use a partitioned device unless strong suggestion not to.
69 * e.g. auto=md
70 * Don't choose partitioned for containers.
71 * 5/ Find out if array already exists
72 * 5a/ if it does not
73 * - choose a name, from mdadm.conf or 'name' field in array.
74 * - create the array
75 * - add the device
76 * 5b/ if it does
77 * - check one drive in array to make sure metadata is a reasonably
78 * close match. Reject if not (e.g. different type)
79 * - add the device
80 * 6/ Make sure /var/run/mdadm.map contains this array.
81 * 7/ Is there enough devices to possibly start the array?
82 * For a container, this means running Incremental_container.
83 * 7a/ if not, finish with success.
84 * 7b/ if yes,
85 * - read all metadata and arrange devices like -A does
86 * - if number of OK devices match expected, or -R and there are enough,
87 * start the array (auto-readonly).
88 */
89 struct stat stb;
90 struct mdinfo info, dinfo;
91 struct mdinfo *sra = NULL, *d;
92 struct mddev_ident *match;
93 char chosen_name[1024];
94 char *md_devname;
95 int rv = 1;
96 struct map_ent *mp, *map = NULL;
97 int dfd = -1, mdfd = -1;
98 char *avail = NULL;
99 int active_disks;
100 int trustworthy;
101 char *name_to_use;
102 mdu_array_info_t ainf;
103 struct dev_policy *policy = NULL;
104 struct map_ent target_array;
105 int have_target;
106 char *devname = devlist->devname;
107
108 struct createinfo *ci = conf_get_create_info();
109
110 if (stat(devname, &stb) < 0) {
111 if (c->verbose >= 0)
112 pr_err("stat failed for %s: %s.\n",
113 devname, strerror(errno));
114 return rv;
115 }
116 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
117 if (c->verbose >= 0)
118 pr_err("%s is not a block device.\n",
119 devname);
120 return rv;
121 }
122 dfd = dev_open(devname, O_RDONLY);
123 if (dfd < 0) {
124 if (c->verbose >= 0)
125 pr_err("cannot open %s: %s.\n",
126 devname, strerror(errno));
127 return rv;
128 }
129 /* If the device is a container, we do something very different */
130 if (must_be_container(dfd)) {
131 if (!st)
132 st = super_by_fd(dfd, NULL);
133 if (st)
134 st->ignore_hw_compat = 1;
135 if (st && st->ss->load_container)
136 rv = st->ss->load_container(st, dfd, NULL);
137
138 close(dfd);
139 if (!rv && st->ss->container_content) {
140 if (map_lock(&map))
141 pr_err("failed to get exclusive lock on mapfile\n");
142 if (c->export)
143 printf("MD_DEVNAME=%s\n", devname);
144 rv = Incremental_container(st, devname, c, NULL);
145 map_unlock(&map);
146 return rv;
147 }
148
149 pr_err("%s is not part of an md array.\n",
150 devname);
151 return rv;
152 }
153
154 /* 1/ Check if device is permitted by mdadm.conf */
155
156 for (;devlist; devlist = devlist->next)
157 if (conf_test_dev(devlist->devname))
158 break;
159 if (!devlist) {
160 devlist = conf_get_devs();
161 for (;devlist; devlist = devlist->next) {
162 struct stat st2;
163 if (stat(devlist->devname, &st2) == 0 &&
164 (st2.st_mode & S_IFMT) == S_IFBLK &&
165 st2.st_rdev == stb.st_rdev)
166 break;
167 }
168 }
169 if (!devlist) {
170 if (c->verbose >= 0)
171 pr_err("%s not permitted by mdadm.conf.\n",
172 devname);
173 goto out;
174 }
175
176 /* 2/ Find metadata, reject if none appropriate (check
177 * version/name from args) */
178
179 if (fstat(dfd, &stb) < 0) {
180 if (c->verbose >= 0)
181 pr_err("fstat failed for %s: %s.\n",
182 devname, strerror(errno));
183 goto out;
184 }
185 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
186 if (c->verbose >= 0)
187 pr_err("%s is not a block device.\n",
188 devname);
189 goto out;
190 }
191
192 dinfo.disk.major = major(stb.st_rdev);
193 dinfo.disk.minor = minor(stb.st_rdev);
194
195 policy = disk_policy(&dinfo);
196 have_target = policy_check_path(&dinfo, &target_array);
197
198 if (st == NULL && (st = guess_super_type(dfd, guess_array)) == NULL) {
199 if (c->verbose >= 0)
200 pr_err("no recognisable superblock on %s.\n",
201 devname);
202 rv = try_spare(devname, &dfd, policy,
203 have_target ? &target_array : NULL,
204 NULL, c->verbose);
205 goto out;
206 }
207 st->ignore_hw_compat = 1;
208 if (st->ss->compare_super == NULL ||
209 st->ss->load_super(st, dfd, NULL)) {
210 if (c->verbose >= 0)
211 pr_err("no RAID superblock on %s.\n",
212 devname);
213 rv = try_spare(devname, &dfd, policy,
214 have_target ? &target_array : NULL,
215 st, c->verbose);
216 free(st);
217 goto out;
218 }
219 close (dfd); dfd = -1;
220
221 st->ss->getinfo_super(st, &info, NULL);
222
223 /* 3/ Check if there is a match in mdadm.conf */
224 match = conf_match(st, &info, devname, c->verbose, &rv);
225 if (!match && rv == 2)
226 goto out;
227
228 if (match && match->devname
229 && strcasecmp(match->devname, "<ignore>") == 0) {
230 if (c->verbose >= 0)
231 pr_err("array containing %s is explicitly ignored by mdadm.conf\n",
232 devname);
233 goto out;
234 }
235 /* Skip the clustered ones. This should be started by
236 * clustering resource agents
237 */
238 if (info.array.state & (1 << MD_SB_CLUSTERED))
239 goto out;
240
241 /* 3a/ if not, check for homehost match. If no match, continue
242 * but don't trust the 'name' in the array. Thus a 'random' minor
243 * number will be assigned, and the device name will be based
244 * on that. */
245 if (match)
246 trustworthy = LOCAL;
247 else if (st->ss->match_home(st, c->homehost) == 1)
248 trustworthy = LOCAL;
249 else if (st->ss->match_home(st, "any") == 1)
250 trustworthy = LOCAL_ANY;
251 else
252 trustworthy = FOREIGN;
253
254 if (!match && !conf_test_metadata(st->ss->name, policy,
255 (trustworthy == LOCAL))) {
256 if (c->verbose >= 1)
257 pr_err("%s has metadata type %s for which auto-assembly is disabled\n",
258 devname, st->ss->name);
259 goto out;
260 }
261 if (trustworthy == LOCAL_ANY)
262 trustworthy = LOCAL;
263
264 /* There are three possible sources for 'autof': command line,
265 * ARRAY line in mdadm.conf, or CREATE line in mdadm.conf.
266 * ARRAY takes precedence, then command line, then
267 * CREATE.
268 */
269 if (match && match->autof)
270 c->autof = match->autof;
271 if (c->autof == 0)
272 c->autof = ci->autof;
273
274 name_to_use = info.name;
275 if (name_to_use[0] == 0 &&
276 info.array.level == LEVEL_CONTAINER) {
277 name_to_use = info.text_version;
278 trustworthy = METADATA;
279 }
280 if (name_to_use[0] && trustworthy != LOCAL &&
281 ! c->require_homehost &&
282 conf_name_is_free(name_to_use))
283 trustworthy = LOCAL;
284
285 /* strip "hostname:" prefix from name if we have decided
286 * to treat it as LOCAL
287 */
288 if (trustworthy == LOCAL && strchr(name_to_use, ':') != NULL)
289 name_to_use = strchr(name_to_use, ':')+1;
290
291 /* 4/ Check if array exists.
292 */
293 if (map_lock(&map))
294 pr_err("failed to get exclusive lock on mapfile\n");
295 /* Now check we can get O_EXCL. If not, probably "mdadm -A" has
296 * taken over
297 */
298 dfd = dev_open(devname, O_RDONLY|O_EXCL);
299 if (dfd < 0) {
300 if (c->verbose >= 0)
301 pr_err("cannot reopen %s: %s.\n",
302 devname, strerror(errno));
303 goto out_unlock;
304 }
305 /* Cannot hold it open while we add the device to the array,
306 * so we must release the O_EXCL and depend on the map_lock()
307 * So now is the best time to remove any partitions.
308 */
309 remove_partitions(dfd);
310 close(dfd);
311 dfd = -1;
312
313 mp = map_by_uuid(&map, info.uuid);
314 if (mp)
315 mdfd = open_dev(mp->devnm);
316 else
317 mdfd = -1;
318
319 if (mdfd < 0) {
320
321 /* Couldn't find an existing array, maybe make a new one */
322 mdfd = create_mddev(match ? match->devname : NULL,
323 name_to_use, c->autof, trustworthy, chosen_name);
324
325 if (mdfd < 0)
326 goto out_unlock;
327
328 sysfs_init(&info, mdfd, NULL);
329
330 if (set_array_info(mdfd, st, &info) != 0) {
331 pr_err("failed to set array info for %s: %s\n",
332 chosen_name, strerror(errno));
333 rv = 2;
334 goto out_unlock;
335 }
336
337 dinfo = info;
338 dinfo.disk.major = major(stb.st_rdev);
339 dinfo.disk.minor = minor(stb.st_rdev);
340 if (add_disk(mdfd, st, &info, &dinfo) != 0) {
341 pr_err("failed to add %s to new array %s: %s.\n",
342 devname, chosen_name, strerror(errno));
343 ioctl(mdfd, STOP_ARRAY, 0);
344 rv = 2;
345 goto out_unlock;
346 }
347 sra = sysfs_read(mdfd, NULL, (GET_DEVS | GET_STATE |
348 GET_OFFSET | GET_SIZE));
349
350 if (!sra || !sra->devs || sra->devs->disk.raid_disk >= 0) {
351 /* It really should be 'none' - must be old buggy
352 * kernel, and mdadm -I may not be able to complete.
353 * So reject it.
354 */
355 ioctl(mdfd, STOP_ARRAY, NULL);
356 pr_err("You have an old buggy kernel which cannot support\n --incremental reliably. Aborting.\n");
357 rv = 2;
358 goto out_unlock;
359 }
360 info.array.working_disks = 1;
361 /* 6/ Make sure /var/run/mdadm.map contains this array. */
362 map_update(&map, fd2devnm(mdfd),
363 info.text_version,
364 info.uuid, chosen_name);
365 } else {
366 /* 5b/ if it does */
367 /* - check one drive in array to make sure metadata is a reasonably */
368 /* close match. Reject if not (e.g. different type) */
369 /* - add the device */
370 char dn[20];
371 int dfd2;
372 int err;
373 struct supertype *st2;
374 struct mdinfo info2, *d;
375
376 sra = sysfs_read(mdfd, NULL, (GET_DEVS | GET_STATE |
377 GET_OFFSET | GET_SIZE));
378
379 if (mp->path)
380 strcpy(chosen_name, mp->path);
381 else
382 strcpy(chosen_name, mp->devnm);
383
384 /* It is generally not OK to add non-spare drives to a
385 * running array as they are probably missing because
386 * they failed. However if runstop is 1, then the
387 * array was possibly started early and our best bet is
388 * to add this anyway.
389 * Also if action policy is re-add or better we allow
390 * re-add.
391 * This doesn't apply to containers as the 'non-spare'
392 * flag has a different meaning. The test has to happen
393 * at the device level there
394 */
395 if (!st->ss->external
396 && (info.disk.state & (1<<MD_DISK_SYNC)) != 0
397 && ! policy_action_allows(policy, st->ss->name,
398 act_re_add)
399 && c->runstop < 1) {
400 if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
401 pr_err("not adding %s to active array (without --run) %s\n",
402 devname, chosen_name);
403 rv = 2;
404 goto out_unlock;
405 }
406 }
407 if (!sra) {
408 rv = 2;
409 goto out_unlock;
410 }
411 if (sra->devs) {
412 sprintf(dn, "%d:%d", sra->devs->disk.major,
413 sra->devs->disk.minor);
414 dfd2 = dev_open(dn, O_RDONLY);
415 if (dfd2 < 0) {
416 pr_err("unable to open %s\n", devname);
417 rv = 2;
418 goto out_unlock;
419 }
420 st2 = dup_super(st);
421 if (st2->ss->load_super(st2, dfd2, NULL) ||
422 st->ss->compare_super(st, st2) != 0) {
423 pr_err("metadata mismatch between %s and chosen array %s\n",
424 devname, chosen_name);
425 close(dfd2);
426 rv = 2;
427 goto out_unlock;
428 }
429 close(dfd2);
430 st2->ss->getinfo_super(st2, &info2, NULL);
431 st2->ss->free_super(st2);
432 if (info.array.level != info2.array.level ||
433 memcmp(info.uuid, info2.uuid, 16) != 0 ||
434 info.array.raid_disks != info2.array.raid_disks) {
435 pr_err("unexpected difference between %s and %s.\n",
436 chosen_name, devname);
437 rv = 2;
438 goto out_unlock;
439 }
440 }
441 info.disk.major = major(stb.st_rdev);
442 info.disk.minor = minor(stb.st_rdev);
443 /* add disk needs to know about containers */
444 if (st->ss->external)
445 sra->array.level = LEVEL_CONTAINER;
446 err = add_disk(mdfd, st, sra, &info);
447 if (err < 0 && errno == EBUSY) {
448 /* could be another device present with the same
449 * disk.number. Find and reject any such
450 */
451 find_reject(mdfd, st, sra, info.disk.number,
452 info.events, c->verbose, chosen_name);
453 err = add_disk(mdfd, st, sra, &info);
454 }
455 if (err < 0 && errno == EINVAL &&
456 info.disk.state & (1<<MD_DISK_SYNC)) {
457 /* Maybe it needs to be added as a spare */
458 if (policy_action_allows(policy, st->ss->name,
459 act_force_spare)) {
460 info.disk.state &= ~(1<<MD_DISK_SYNC);
461 err = add_disk(mdfd, st, sra, &info);
462 } else
463 if (c->verbose >= 0)
464 pr_err("can only add %s to %s as a spare, and force-spare is not set.\n",
465 devname, chosen_name);
466 }
467 if (err < 0) {
468 pr_err("failed to add %s to existing array %s: %s.\n",
469 devname, chosen_name, strerror(errno));
470 rv = 2;
471 goto out_unlock;
472 }
473 info.array.working_disks = 0;
474 for (d = sra->devs; d; d=d->next)
475 info.array.working_disks ++;
476
477 }
478 if (strncmp(chosen_name, "/dev/md/", 8) == 0)
479 md_devname = chosen_name+8;
480 else
481 md_devname = chosen_name;
482 if (c->export) {
483 printf("MD_DEVICE=%s\n", fd2devnm(mdfd));
484 printf("MD_DEVNAME=%s\n", md_devname);
485 printf("MD_FOREIGN=%s\n", trustworthy == FOREIGN ? "yes" : "no");
486 }
487
488 /* 7/ Is there enough devices to possibly start the array? */
489 /* 7a/ if not, finish with success. */
490 if (info.array.level == LEVEL_CONTAINER) {
491 char devnm[32];
492 /* Try to assemble within the container */
493 sysfs_uevent(sra, "change");
494 if (!c->export && c->verbose >= 0)
495 pr_err("container %s now has %d device%s\n",
496 chosen_name, info.array.working_disks,
497 info.array.working_disks == 1?"":"s");
498 wait_for(chosen_name, mdfd);
499 if (st->ss->external)
500 strcpy(devnm, fd2devnm(mdfd));
501 if (st->ss->load_container)
502 rv = st->ss->load_container(st, mdfd, NULL);
503 close(mdfd);
504 sysfs_free(sra);
505 if (!rv)
506 rv = Incremental_container(st, chosen_name, c, NULL);
507 map_unlock(&map);
508 /* after spare is added, ping monitor for external metadata
509 * so that it can eg. try to rebuild degraded array */
510 if (st->ss->external)
511 ping_monitor(devnm);
512 return rv;
513 }
514
515 /* We have added something to the array, so need to re-read the
516 * state. Eventually this state should be kept up-to-date as
517 * things change.
518 */
519 sysfs_free(sra);
520 sra = sysfs_read(mdfd, NULL, (GET_DEVS | GET_STATE |
521 GET_OFFSET | GET_SIZE));
522 active_disks = count_active(st, sra, mdfd, &avail, &info);
523 if (enough(info.array.level, info.array.raid_disks,
524 info.array.layout, info.array.state & 1,
525 avail) == 0) {
526 if (c->export) {
527 printf("MD_STARTED=no\n");
528 } else if (c->verbose >= 0)
529 pr_err("%s attached to %s, not enough to start (%d).\n",
530 devname, chosen_name, active_disks);
531 rv = 0;
532 goto out_unlock;
533 }
534
535 /* 7b/ if yes, */
536 /* - if number of OK devices match expected, or -R and there */
537 /* are enough, */
538 /* + add any bitmap file */
539 /* + start the array (auto-readonly). */
540
541 if (ioctl(mdfd, GET_ARRAY_INFO, &ainf) == 0) {
542 if (c->export) {
543 printf("MD_STARTED=already\n");
544 } else if (c->verbose >= 0)
545 pr_err("%s attached to %s which is already active.\n",
546 devname, chosen_name);
547 rv = 0;
548 goto out_unlock;
549 }
550
551 map_unlock(&map);
552 if (c->runstop > 0 || active_disks >= info.array.working_disks) {
553 struct mdinfo *dsk;
554 /* Let's try to start it */
555
556 if (info.reshape_active && !(info.reshape_active & RESHAPE_NO_BACKUP)) {
557 pr_err("%s: This array is being reshaped and cannot be started\n",
558 chosen_name);
559 cont_err("by --incremental. Please use --assemble\n");
560 goto out;
561 }
562 if (match && match->bitmap_file) {
563 int bmfd = open(match->bitmap_file, O_RDWR);
564 if (bmfd < 0) {
565 pr_err("Could not open bitmap file %s.\n",
566 match->bitmap_file);
567 goto out;
568 }
569 if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
570 close(bmfd);
571 pr_err("Failed to set bitmapfile for %s.\n",
572 chosen_name);
573 goto out;
574 }
575 close(bmfd);
576 }
577 /* Need to remove from the array any devices which
578 * 'count_active' discerned were too old or inappropriate
579 */
580 for (d = sra ? sra->devs : NULL ; d ; d = d->next)
581 if (d->disk.state & (1<<MD_DISK_REMOVED))
582 remove_disk(mdfd, st, sra, d);
583
584 if ((sra == NULL || active_disks >= info.array.working_disks)
585 && trustworthy != FOREIGN)
586 rv = ioctl(mdfd, RUN_ARRAY, NULL);
587 else
588 rv = sysfs_set_str(sra, NULL,
589 "array_state", "read-auto");
590 /* Array might be O_EXCL which will interfere with
591 * fsck and mount. So re-open without O_EXCL.
592 */
593 reopen_mddev(mdfd);
594 if (rv == 0) {
595 if (c->export) {
596 printf("MD_STARTED=yes\n");
597 } else if (c->verbose >= 0)
598 pr_err("%s attached to %s, which has been started.\n",
599 devname, chosen_name);
600 rv = 0;
601 wait_for(chosen_name, mdfd);
602 /* We just started the array, so some devices
603 * might have been evicted from the array
604 * because their event counts were too old.
605 * If the action=re-add policy is in-force for
606 * those devices we should re-add them now.
607 */
608 for (dsk = sra->devs; dsk ; dsk = dsk->next) {
609 if (disk_action_allows(dsk, st->ss->name, act_re_add) &&
610 add_disk(mdfd, st, sra, dsk) == 0)
611 pr_err("%s re-added to %s\n",
612 dsk->sys_name, chosen_name);
613 }
614 } else {
615 pr_err("%s attached to %s, but failed to start: %s.\n",
616 devname, chosen_name, strerror(errno));
617 rv = 1;
618 }
619 } else {
620 if (c->export) {
621 printf("MD_STARTED=unsafe\n");
622 } else if (c->verbose >= 0)
623 pr_err("%s attached to %s, not enough to start safely.\n",
624 devname, chosen_name);
625 rv = 0;
626 }
627 out:
628 free(avail);
629 if (dfd >= 0)
630 close(dfd);
631 if (mdfd >= 0)
632 close(mdfd);
633 if (policy)
634 dev_policy_free(policy);
635 if (sra)
636 sysfs_free(sra);
637 return rv;
638 out_unlock:
639 map_unlock(&map);
640 goto out;
641 }
642
643 static void find_reject(int mdfd, struct supertype *st, struct mdinfo *sra,
644 int number, __u64 events, int verbose,
645 char *array_name)
646 {
647 /* Find a device attached to this array with a disk.number of number
648 * and events less than the passed events, and remove the device.
649 */
650 struct mdinfo *d;
651 mdu_array_info_t ra;
652
653 if (ioctl(mdfd, GET_ARRAY_INFO, &ra) == 0)
654 return; /* not safe to remove from active arrays
655 * without thinking more */
656
657 for (d = sra->devs; d ; d = d->next) {
658 char dn[10];
659 int dfd;
660 struct mdinfo info;
661 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
662 dfd = dev_open(dn, O_RDONLY);
663 if (dfd < 0)
664 continue;
665 if (st->ss->load_super(st, dfd, NULL)) {
666 close(dfd);
667 continue;
668 }
669 st->ss->getinfo_super(st, &info, NULL);
670 st->ss->free_super(st);
671 close(dfd);
672
673 if (info.disk.number != number ||
674 info.events >= events)
675 continue;
676
677 if (d->disk.raid_disk > -1)
678 sysfs_set_str(sra, d, "slot", "none");
679 if (sysfs_set_str(sra, d, "state", "remove") == 0)
680 if (verbose >= 0)
681 pr_err("removing old device %s from %s\n",
682 d->sys_name+4, array_name);
683 }
684 }
685
686 static int count_active(struct supertype *st, struct mdinfo *sra,
687 int mdfd, char **availp,
688 struct mdinfo *bestinfo)
689 {
690 /* count how many devices in sra think they are active */
691 struct mdinfo *d;
692 int cnt = 0;
693 int replcnt = 0;
694 __u64 max_events = 0;
695 char *avail = NULL;
696 int *best = NULL;
697 char *devmap = NULL;
698 int numdevs = 0;
699 int devnum;
700 int b, i;
701 int raid_disks = 0;
702
703 if (!sra)
704 return 0;
705
706 for (d = sra->devs ; d ; d = d->next)
707 numdevs++;
708 for (d = sra->devs, devnum = 0 ; d ; d = d->next, devnum++) {
709 char dn[30];
710 int dfd;
711 int ok;
712 struct mdinfo info;
713
714 sprintf(dn, "%d:%d", d->disk.major, d->disk.minor);
715 dfd = dev_open(dn, O_RDONLY);
716 if (dfd < 0)
717 continue;
718 ok = st->ss->load_super(st, dfd, NULL);
719 close(dfd);
720 if (ok != 0)
721 continue;
722 info.array.raid_disks = raid_disks;
723 st->ss->getinfo_super(st, &info, devmap + raid_disks * devnum);
724 if (!avail) {
725 raid_disks = info.array.raid_disks;
726 avail = xcalloc(raid_disks, 1);
727 *availp = avail;
728
729 best = xcalloc(raid_disks, sizeof(int));
730 devmap = xcalloc(raid_disks, numdevs);
731
732 st->ss->getinfo_super(st, &info, devmap);
733 }
734
735 if (info.disk.state & (1<<MD_DISK_SYNC))
736 {
737 if (cnt == 0) {
738 cnt++;
739 max_events = info.events;
740 avail[info.disk.raid_disk] = 2;
741 best[info.disk.raid_disk] = devnum;
742 st->ss->getinfo_super(st, bestinfo, NULL);
743 } else if (info.events == max_events) {
744 avail[info.disk.raid_disk] = 2;
745 best[info.disk.raid_disk] = devnum;
746 } else if (info.events == max_events-1) {
747 if (avail[info.disk.raid_disk] == 0) {
748 avail[info.disk.raid_disk] = 1;
749 best[info.disk.raid_disk] = devnum;
750 }
751 } else if (info.events < max_events - 1)
752 ;
753 else if (info.events == max_events+1) {
754 int i;
755 max_events = info.events;
756 for (i = 0; i < raid_disks; i++)
757 if (avail[i])
758 avail[i]--;
759 avail[info.disk.raid_disk] = 2;
760 best[info.disk.raid_disk] = devnum;
761 st->ss->getinfo_super(st, bestinfo, NULL);
762 } else { /* info.events much bigger */
763 memset(avail, 0, raid_disks);
764 max_events = info.events;
765 avail[info.disk.raid_disk] = 2;
766 best[info.disk.raid_disk] = devnum;
767 st->ss->getinfo_super(st, bestinfo, NULL);
768 }
769 } else if (info.disk.state & (1<<MD_DISK_REPLACEMENT))
770 replcnt++;
771 st->ss->free_super(st);
772 }
773 if (!avail)
774 return 0;
775 /* We need to reject any device that thinks the best device is
776 * failed or missing */
777 for (b = 0; b < raid_disks; b++)
778 if (avail[b] == 2)
779 break;
780 cnt = 0;
781 for (i = 0 ; i < raid_disks ; i++) {
782 if (i != b && avail[i])
783 if (devmap[raid_disks * best[i] + b] == 0) {
784 /* This device thinks 'b' is failed -
785 * don't use it */
786 devnum = best[i];
787 for (d=sra->devs ; devnum; d = d->next)
788 devnum--;
789 d->disk.state |= (1 << MD_DISK_REMOVED);
790 avail[i] = 0;
791 }
792 if (avail[i])
793 cnt++;
794 }
795 /* Also need to reject any spare device with an event count that
796 * is too high
797 */
798 for (d = sra->devs; d; d = d->next) {
799 if (!(d->disk.state & (1<<MD_DISK_SYNC)) &&
800 d->events > max_events)
801 d->disk.state |= (1 << MD_DISK_REMOVED);
802 }
803 free(best);
804 free(devmap);
805 return cnt + replcnt;
806 }
807
808 /* test if container has degraded member(s) */
809 static int container_members_max_degradation(struct map_ent *map, struct map_ent *me)
810 {
811 mdu_array_info_t array;
812 int afd;
813 int max_degraded = 0;
814
815 for(; map; map = map->next) {
816 if (!metadata_container_matches(map->metadata, me->devnm))
817 continue;
818 afd = open_dev(map->devnm);
819 if (afd < 0)
820 continue;
821 /* most accurate information regarding array degradation */
822 if (ioctl(afd, GET_ARRAY_INFO, &array) >= 0) {
823 int degraded = array.raid_disks - array.active_disks -
824 array.spare_disks;
825 if (degraded > max_degraded)
826 max_degraded = degraded;
827 }
828 close(afd);
829 }
830 return (max_degraded);
831 }
832
833 static int array_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
834 struct map_ent *target, int bare,
835 struct supertype *st, int verbose)
836 {
837 /* This device doesn't have any md metadata
838 * The device policy allows 'spare' and if !bare, it allows spare-same-slot.
839 * If 'st' is not set, then we only know that some metadata allows this,
840 * others possibly don't.
841 * So look for a container or array to attach the device to.
842 * Prefer 'target' if that is set and the array is found.
843 *
844 * If st is set, then only arrays of that type are considered
845 * Return 0 on success, or some exit code on failure, probably 1.
846 */
847 int rv = 1;
848 struct stat stb;
849 struct map_ent *mp, *map = NULL;
850 struct mdinfo *chosen = NULL;
851 int dfd = *dfdp;
852
853 if (fstat(dfd, &stb) != 0)
854 return 1;
855
856 /*
857 * Now we need to find a suitable array to add this to.
858 * We only accept arrays that:
859 * - match 'st'
860 * - are in the same domains as the device
861 * - are of an size for which the device will be useful
862 * and we choose the one that is the most degraded
863 */
864
865 if (map_lock(&map)) {
866 pr_err("failed to get exclusive lock on mapfile\n");
867 return 1;
868 }
869 for (mp = map ; mp ; mp = mp->next) {
870 struct supertype *st2;
871 struct domainlist *dl = NULL;
872 struct mdinfo *sra;
873 unsigned long long devsize;
874 unsigned long long component_size = 0;
875
876 if (is_subarray(mp->metadata))
877 continue;
878 if (st) {
879 st2 = st->ss->match_metadata_desc(mp->metadata);
880 if (!st2 ||
881 (st->minor_version >= 0 &&
882 st->minor_version != st2->minor_version)) {
883 if (verbose > 1)
884 pr_err("not adding %s to %s as metadata type doesn't match\n",
885 devname, mp->path);
886 free(st2);
887 continue;
888 }
889 free(st2);
890 }
891 sra = sysfs_read(-1, mp->devnm,
892 GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE|
893 GET_DEGRADED|GET_COMPONENT|GET_VERSION);
894 if (!sra) {
895 /* Probably a container - no degraded info */
896 sra = sysfs_read(-1, mp->devnm,
897 GET_DEVS|GET_OFFSET|GET_SIZE|GET_STATE|
898 GET_COMPONENT|GET_VERSION);
899 if (sra)
900 sra->array.failed_disks = -1;
901 }
902 if (!sra)
903 continue;
904 if (st == NULL) {
905 int i;
906 st2 = NULL;
907 for(i = 0; !st2 && superlist[i]; i++)
908 st2 = superlist[i]->match_metadata_desc(
909 sra->text_version);
910 if (!st2) {
911 if (verbose > 1)
912 pr_err("not adding %s to %s as metadata not recognised.\n",
913 devname, mp->path);
914 goto next;
915 }
916 /* Need to double check the 'act_spare' permissions applies
917 * to this metadata.
918 */
919 if (!policy_action_allows(pol, st2->ss->name, act_spare))
920 goto next;
921 if (!bare && !policy_action_allows(pol, st2->ss->name,
922 act_spare_same_slot))
923 goto next;
924 } else
925 st2 = st;
926 /* update number of failed disks for mostly degraded
927 * container member */
928 if (sra->array.failed_disks == -1)
929 sra->array.failed_disks = container_members_max_degradation(map, mp);
930
931 get_dev_size(dfd, NULL, &devsize);
932 if (sra->component_size == 0) {
933 /* true for containers, here we must read superblock
934 * to obtain minimum spare size */
935 struct supertype *st3 = dup_super(st2);
936 int mdfd = open_dev(mp->devnm);
937 if (mdfd < 0) {
938 free(st3);
939 goto next;
940 }
941 if (st3->ss->load_container &&
942 !st3->ss->load_container(st3, mdfd, mp->path)) {
943 component_size = st3->ss->min_acceptable_spare_size(st3);
944 st3->ss->free_super(st3);
945 }
946 free(st3);
947 close(mdfd);
948 }
949 if ((sra->component_size > 0 &&
950 st2->ss->avail_size(st2, devsize,
951 sra->devs
952 ? sra->devs->data_offset
953 : INVALID_SECTORS)
954 < sra->component_size)
955 ||
956 (sra->component_size == 0 && devsize < component_size)) {
957 if (verbose > 1)
958 pr_err("not adding %s to %s as it is too small\n",
959 devname, mp->path);
960 goto next;
961 }
962 /* test against target.
963 * If 'target' is set and 'bare' is false, we only accept
964 * arrays/containers that match 'target'.
965 * If 'target' is set and 'bare' is true, we prefer the
966 * array which matches 'target'.
967 * target is considered only if we deal with degraded array
968 */
969 if (target && policy_action_allows(pol, st2->ss->name,
970 act_spare_same_slot)) {
971 if (strcmp(target->metadata, mp->metadata) == 0 &&
972 memcmp(target->uuid, mp->uuid,
973 sizeof(target->uuid)) == 0 &&
974 sra->array.failed_disks > 0) {
975 /* This is our target!! */
976 if (chosen)
977 sysfs_free(chosen);
978 chosen = sra;
979 sra = NULL;
980 /* skip to end so we don't check any more */
981 while (mp->next)
982 mp = mp->next;
983 goto next;
984 }
985 /* not our target */
986 if (!bare)
987 goto next;
988 }
989
990 dl = domain_from_array(sra, st2->ss->name);
991 if (domain_test(dl, pol, st2->ss->name) != 1) {
992 /* domain test fails */
993 if (verbose > 1)
994 pr_err("not adding %s to %s as it is not in a compatible domain\n",
995 devname, mp->path);
996
997 goto next;
998 }
999 /* all tests passed, OK to add to this array */
1000 if (!chosen) {
1001 chosen = sra;
1002 sra = NULL;
1003 } else if (chosen->array.failed_disks < sra->array.failed_disks) {
1004 sysfs_free(chosen);
1005 chosen = sra;
1006 sra = NULL;
1007 }
1008 next:
1009 if (sra)
1010 sysfs_free(sra);
1011 if (st != st2)
1012 free(st2);
1013 if (dl)
1014 domain_free(dl);
1015 }
1016 if (chosen) {
1017 /* add current device to chosen array as a spare */
1018 int mdfd = open_dev(chosen->sys_name);
1019 if (mdfd >= 0) {
1020 struct mddev_dev devlist;
1021 char devname[20];
1022 devlist.next = NULL;
1023 devlist.used = 0;
1024 devlist.writemostly = 0;
1025 devlist.devname = devname;
1026 sprintf(devname, "%d:%d", major(stb.st_rdev),
1027 minor(stb.st_rdev));
1028 devlist.disposition = 'a';
1029 close(dfd);
1030 *dfdp = -1;
1031 rv = Manage_subdevs(chosen->sys_name, mdfd, &devlist,
1032 -1, 0, NULL, 0);
1033 close(mdfd);
1034 }
1035 if (verbose > 0) {
1036 if (rv == 0)
1037 pr_err("added %s as spare for %s\n",
1038 devname, chosen->sys_name);
1039 else
1040 pr_err("failed to add %s as spare for %s\n",
1041 devname, chosen->sys_name);
1042 }
1043 sysfs_free(chosen);
1044 }
1045 map_unlock(&map);
1046 return rv;
1047 }
1048
1049 static int partition_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
1050 struct supertype *st, int verbose)
1051 {
1052 /* we know that at least one partition virtual-metadata is
1053 * allowed to incorporate spares like this device. We need to
1054 * find a suitable device to copy partition information from.
1055 *
1056 * Getting a list of all disk (not partition) devices is
1057 * slightly non-trivial. We could look at /sys/block, but
1058 * that is theoretically due to be removed. Maybe best to use
1059 * /dev/disk/by-path/?* and ignore names ending '-partNN' as
1060 * we depend on this directory of 'path' info. But that fails
1061 * to find loop devices and probably others. Maybe don't
1062 * worry about that, they aren't the real target.
1063 *
1064 * So: check things in /dev/disk/by-path to see if they are in
1065 * a compatible domain, then load the partition table and see
1066 * if it is OK for the new device, and choose the largest
1067 * partition table that fits.
1068 */
1069 DIR *dir;
1070 struct dirent *de;
1071 char *chosen = NULL;
1072 unsigned long long chosen_size = 0;
1073 struct supertype *chosen_st = NULL;
1074 int fd;
1075
1076 dir = opendir("/dev/disk/by-path");
1077 if (!dir)
1078 return 1;
1079 while ((de = readdir(dir)) != NULL) {
1080 char *ep;
1081 struct dev_policy *pol2 = NULL;
1082 struct domainlist *domlist = NULL;
1083 int fd = -1;
1084 struct mdinfo info;
1085 struct supertype *st2 = NULL;
1086 char *devname = NULL;
1087 unsigned long long devsectors;
1088
1089 if (de->d_ino == 0 ||
1090 de->d_name[0] == '.' ||
1091 (de->d_type != DT_LNK && de->d_type != DT_UNKNOWN))
1092 goto next;
1093
1094 ep = de->d_name + strlen(de->d_name);
1095 while (ep > de->d_name &&
1096 isdigit(ep[-1]))
1097 ep--;
1098 if (ep > de->d_name + 5 &&
1099 strncmp(ep-5, "-part", 5) == 0)
1100 /* This is a partition - skip it */
1101 goto next;
1102
1103 pol2 = path_policy(de->d_name, type_disk);
1104
1105 domain_merge(&domlist, pol2, st ? st->ss->name : NULL);
1106 if (domain_test(domlist, pol, st ? st->ss->name : NULL) != 1)
1107 /* new device is incompatible with this device. */
1108 goto next;
1109
1110 domain_free(domlist);
1111 domlist = NULL;
1112
1113 if (asprintf(&devname, "/dev/disk/by-path/%s", de->d_name) != 1) {
1114 devname = NULL;
1115 goto next;
1116 }
1117 fd = open(devname, O_RDONLY);
1118 if (fd < 0)
1119 goto next;
1120 if (get_dev_size(fd, devname, &devsectors) == 0)
1121 goto next;
1122 devsectors >>= 9;
1123
1124 if (st)
1125 st2 = dup_super(st);
1126 else
1127 st2 = guess_super_type(fd, guess_partitions);
1128 if (st2 == NULL ||
1129 st2->ss->load_super(st2, fd, NULL) < 0)
1130 goto next;
1131
1132 if (!st) {
1133 /* Check domain policy again, this time referring to metadata */
1134 domain_merge(&domlist, pol2, st2->ss->name);
1135 if (domain_test(domlist, pol, st2->ss->name) != 1)
1136 /* Incompatible devices for this metadata type */
1137 goto next;
1138 if (!policy_action_allows(pol, st2->ss->name, act_spare))
1139 /* Some partition types allow sparing, but not
1140 * this one.
1141 */
1142 goto next;
1143 }
1144
1145 st2->ss->getinfo_super(st2, &info, NULL);
1146 if (info.component_size > devsectors)
1147 /* This partitioning doesn't fit in the device */
1148 goto next;
1149
1150 /* This is an acceptable device to copy partition
1151 * metadata from. We could just stop here, but I
1152 * think I want to keep looking incase a larger
1153 * metadata which makes better use of the device can
1154 * be found.
1155 */
1156 if (chosen == NULL ||
1157 chosen_size < info.component_size) {
1158 chosen_size = info.component_size;
1159 free(chosen);
1160 chosen = devname;
1161 devname = NULL;
1162 if (chosen_st) {
1163 chosen_st->ss->free_super(chosen_st);
1164 free(chosen_st);
1165 }
1166 chosen_st = st2;
1167 st2 = NULL;
1168 }
1169
1170 next:
1171 free(devname);
1172 domain_free(domlist);
1173 dev_policy_free(pol2);
1174 if (st2)
1175 st2->ss->free_super(st2);
1176 free(st2);
1177
1178 if (fd >= 0)
1179 close(fd);
1180 }
1181
1182 closedir(dir);
1183
1184 if (!chosen)
1185 return 1;
1186
1187 /* 'chosen' is the best device we can find. Let's write its
1188 * metadata to devname dfd is read-only so don't use that
1189 */
1190 fd = open(devname, O_RDWR);
1191 if (fd >= 0) {
1192 chosen_st->ss->store_super(chosen_st, fd);
1193 close(fd);
1194 }
1195 free(chosen);
1196 chosen_st->ss->free_super(chosen_st);
1197 free(chosen_st);
1198 return 0;
1199 }
1200
1201 static int is_bare(int dfd)
1202 {
1203 unsigned long long size = 0;
1204 char bufpad[4096 + 4096];
1205 char *buf = (char*)(((long)bufpad + 4096) & ~4095);
1206
1207 if (lseek(dfd, 0, SEEK_SET) != 0 ||
1208 read(dfd, buf, 4096) != 4096)
1209 return 0;
1210
1211 if (buf[0] != '\0' && buf[0] != '\x5a' && buf[0] != '\xff')
1212 return 0;
1213 if (memcmp(buf, buf+1, 4095) != 0)
1214 return 0;
1215
1216 /* OK, first 4K appear blank, try the end. */
1217 get_dev_size(dfd, NULL, &size);
1218 if (lseek(dfd, size-4096, SEEK_SET) < 0 ||
1219 read(dfd, buf, 4096) != 4096)
1220 return 0;
1221
1222 if (buf[0] != '\0' && buf[0] != '\x5a' && buf[0] != '\xff')
1223 return 0;
1224 if (memcmp(buf, buf+1, 4095) != 0)
1225 return 0;
1226
1227 return 1;
1228 }
1229
1230 /* adding a spare to a regular array is quite different from adding one to
1231 * a set-of-partitions virtual array.
1232 * This function determines which is worth trying and tries as appropriate.
1233 * Arrays are given priority over partitions.
1234 */
1235 static int try_spare(char *devname, int *dfdp, struct dev_policy *pol,
1236 struct map_ent *target,
1237 struct supertype *st, int verbose)
1238 {
1239 int i;
1240 int rv;
1241 int arrays_ok = 0;
1242 int partitions_ok = 0;
1243 int dfd = *dfdp;
1244 int bare;
1245
1246 /* Can only add a spare if device has at least one domain */
1247 if (pol_find(pol, pol_domain) == NULL)
1248 return 1;
1249 /* And only if some action allows spares */
1250 if (!policy_action_allows(pol, st?st->ss->name:NULL, act_spare))
1251 return 1;
1252
1253 /* Now check if the device is bare.
1254 * bare devices can always be added as a spare
1255 * non-bare devices can only be added if spare-same-slot is permitted,
1256 * and this device is replacing a previous device - in which case 'target'
1257 * will be set.
1258 */
1259 if (!is_bare(dfd)) {
1260 /* Must have a target and allow same_slot */
1261 /* Later - may allow force_spare without target */
1262 if (!target ||
1263 !policy_action_allows(pol, st?st->ss->name:NULL,
1264 act_spare_same_slot)) {
1265 if (verbose > 1)
1266 pr_err("%s is not bare, so not considering as a spare\n",
1267 devname);
1268 return 1;
1269 }
1270 bare = 0;
1271 } else
1272 bare = 1;
1273
1274 /* It might be OK to add this device to an array - need to see
1275 * what arrays might be candidates.
1276 */
1277 if (st) {
1278 /* just try try 'array' or 'partition' based on this metadata */
1279 if (st->ss->add_to_super)
1280 return array_try_spare(devname, dfdp, pol, target, bare,
1281 st, verbose);
1282 else
1283 return partition_try_spare(devname, dfdp, pol,
1284 st, verbose);
1285 }
1286 /* No metadata was specified or found so options are open.
1287 * Check for whether any array metadata, or any partition metadata
1288 * might allow adding the spare. This check is just help to avoid
1289 * a more costly scan of all arrays when we can be sure that will
1290 * fail.
1291 */
1292 for (i = 0; (!arrays_ok || !partitions_ok) && superlist[i] ; i++) {
1293 if (superlist[i]->add_to_super && !arrays_ok &&
1294 policy_action_allows(pol, superlist[i]->name, act_spare))
1295 arrays_ok = 1;
1296 if (superlist[i]->add_to_super == NULL && !partitions_ok &&
1297 policy_action_allows(pol, superlist[i]->name, act_spare))
1298 partitions_ok = 1;
1299 }
1300 rv = 1;
1301 if (arrays_ok)
1302 rv = array_try_spare(devname, dfdp, pol, target, bare,
1303 st, verbose);
1304 if (rv != 0 && partitions_ok)
1305 rv = partition_try_spare(devname, dfdp, pol, st, verbose);
1306 return rv;
1307 }
1308
1309 int IncrementalScan(struct context *c, char *devnm)
1310 {
1311 /* look at every device listed in the 'map' file.
1312 * If one is found that is not running then:
1313 * look in mdadm.conf for bitmap file.
1314 * if one exists, but array has none, add it.
1315 * try to start array in auto-readonly mode
1316 */
1317 struct map_ent *mapl = NULL;
1318 struct map_ent *me;
1319 struct mddev_ident *devs, *mddev;
1320 int rv = 0;
1321 char container[32];
1322 char *only = NULL;
1323
1324 map_read(&mapl);
1325 devs = conf_get_ident(NULL);
1326
1327 restart:
1328 for (me = mapl ; me ; me = me->next) {
1329 mdu_array_info_t array;
1330 mdu_bitmap_file_t bmf;
1331 struct mdinfo *sra;
1332 int mdfd;
1333
1334 if (devnm && strcmp(devnm, me->devnm) != 0)
1335 continue;
1336 if (devnm && me->metadata[0] == '/') {
1337 char *sl;
1338 /* member array, need to work on container */
1339 strncpy(container, me->metadata+1, 32);
1340 container[31] = 0;
1341 sl = strchr(container, '/');
1342 if (sl)
1343 *sl = 0;
1344 only = devnm;
1345 devnm = container;
1346 goto restart;
1347 }
1348 mdfd = open_dev(me->devnm);
1349
1350 if (mdfd < 0)
1351 continue;
1352 if (!isdigit(me->metadata[0])) {
1353 /* must be a container */
1354 struct supertype *st = super_by_fd(mdfd, NULL);
1355 int ret = 0;
1356 struct map_ent *map = NULL;
1357 if (st)
1358 st->ignore_hw_compat = 1;
1359 if (st && st->ss->load_container)
1360 ret = st->ss->load_container(st, mdfd, NULL);
1361 close(mdfd);
1362 if (!ret && st && st->ss->container_content) {
1363 if (map_lock(&map))
1364 pr_err("failed to get exclusive lock on mapfile\n");
1365 ret = Incremental_container(st, me->path, c, only);
1366 map_unlock(&map);
1367 }
1368 if (ret)
1369 rv = 1;
1370 continue;
1371 }
1372 if (ioctl(mdfd, GET_ARRAY_INFO, &array) == 0 ||
1373 errno != ENODEV) {
1374 close(mdfd);
1375 continue;
1376 }
1377 /* Ok, we can try this one. Maybe it needs a bitmap */
1378 for (mddev = devs ; mddev ; mddev = mddev->next)
1379 if (mddev->devname && me->path
1380 && devname_matches(mddev->devname, me->path))
1381 break;
1382 if (mddev && mddev->bitmap_file) {
1383 /*
1384 * Note: early kernels will wrongly fail this, so it
1385 * is a hint only
1386 */
1387 int added = -1;
1388 if (ioctl(mdfd, GET_ARRAY_INFO, &bmf) < 0) {
1389 int bmfd = open(mddev->bitmap_file, O_RDWR);
1390 if (bmfd >= 0) {
1391 added = ioctl(mdfd, SET_BITMAP_FILE,
1392 bmfd);
1393 close(bmfd);
1394 }
1395 }
1396 if (c->verbose >= 0) {
1397 if (added == 0)
1398 pr_err("Added bitmap %s to %s\n",
1399 mddev->bitmap_file, me->path);
1400 else if (errno != EEXIST)
1401 pr_err("Failed to add bitmap to %s: %s\n",
1402 me->path, strerror(errno));
1403 }
1404 }
1405 /* FIXME check for reshape_active and consider not
1406 * starting array.
1407 */
1408 sra = sysfs_read(mdfd, NULL, 0);
1409 if (sra) {
1410 if (sysfs_set_str(sra, NULL,
1411 "array_state", "read-auto") == 0) {
1412 if (c->verbose >= 0)
1413 pr_err("started array %s\n",
1414 me->path ?: me->devnm);
1415 } else {
1416 pr_err("failed to start array %s: %s\n",
1417 me->path ?: me->devnm,
1418 strerror(errno));
1419 rv = 1;
1420 }
1421 sysfs_free(sra);
1422 }
1423 }
1424 return rv;
1425 }
1426
1427 static char *container2devname(char *devname)
1428 {
1429 char *mdname = NULL;
1430
1431 if (devname[0] == '/') {
1432 int fd = open(devname, O_RDONLY);
1433 if (fd >= 0) {
1434 mdname = xstrdup(fd2devnm(fd));
1435 close(fd);
1436 }
1437 } else {
1438 int uuid[4];
1439 struct map_ent *mp, *map = NULL;
1440
1441 if (!parse_uuid(devname, uuid))
1442 return mdname;
1443 mp = map_by_uuid(&map, uuid);
1444 if (mp)
1445 mdname = xstrdup(mp->devnm);
1446 map_free(map);
1447 }
1448
1449 return mdname;
1450 }
1451
1452 static int Incremental_container(struct supertype *st, char *devname,
1453 struct context *c, char *only)
1454 {
1455 /* Collect the contents of this container and for each
1456 * array, choose a device name and assemble the array.
1457 */
1458
1459 struct mdinfo *list;
1460 struct mdinfo *ra;
1461 struct map_ent *map = NULL;
1462 struct mdinfo info;
1463 int trustworthy;
1464 struct mddev_ident *match;
1465 int rv = 0;
1466 struct domainlist *domains;
1467 struct map_ent *smp;
1468 int suuid[4];
1469 int sfd;
1470 int ra_blocked = 0;
1471 int ra_all = 0;
1472 int result = 0;
1473
1474 st->ss->getinfo_super(st, &info, NULL);
1475
1476 if ((c->runstop > 0 && info.container_enough >= 0) ||
1477 info.container_enough > 0)
1478 /* pass */;
1479 else {
1480 if (c->export) {
1481 printf("MD_STARTED=no\n");
1482 } else if (c->verbose)
1483 pr_err("not enough devices to start the container\n");
1484 return 0;
1485 }
1486
1487 match = conf_match(st, &info, devname, c->verbose, &rv);
1488 if (match == NULL && rv == 2)
1489 return rv;
1490
1491 /* Need to compute 'trustworthy' */
1492 if (match)
1493 trustworthy = LOCAL;
1494 else if (st->ss->match_home(st, c->homehost) == 1)
1495 trustworthy = LOCAL;
1496 else if (st->ss->match_home(st, "any") == 1)
1497 trustworthy = LOCAL;
1498 else
1499 trustworthy = FOREIGN;
1500
1501 list = st->ss->container_content(st, NULL);
1502 /* when nothing to activate - quit */
1503 if (list == NULL) {
1504 if (c->export) {
1505 printf("MD_STARTED=nothing\n");
1506 }
1507 return 0;
1508 }
1509 for (ra = list ; ra ; ra = ra->next) {
1510 int mdfd;
1511 char chosen_name[1024];
1512 struct map_ent *mp;
1513 struct mddev_ident *match = NULL;
1514
1515 ra_all++;
1516 /* do not activate arrays blocked by metadata handler */
1517 if (ra->array.state & (1 << MD_SB_BLOCK_VOLUME)) {
1518 pr_err("Cannot activate array %s in %s.\n",
1519 ra->text_version, devname);
1520 ra_blocked++;
1521 continue;
1522 }
1523 mp = map_by_uuid(&map, ra->uuid);
1524
1525 if (mp) {
1526 mdfd = open_dev(mp->devnm);
1527 if (mp->path)
1528 strcpy(chosen_name, mp->path);
1529 else
1530 strcpy(chosen_name, mp->devnm);
1531 } else if (!only) {
1532
1533 /* Check in mdadm.conf for container == devname and
1534 * member == ra->text_version after second slash.
1535 */
1536 char *sub = strchr(ra->text_version+1, '/');
1537 struct mddev_ident *array_list;
1538 if (sub) {
1539 sub++;
1540 array_list = conf_get_ident(NULL);
1541 } else
1542 array_list = NULL;
1543 for(; array_list ; array_list = array_list->next) {
1544 char *dn;
1545 if (array_list->member == NULL ||
1546 array_list->container == NULL)
1547 continue;
1548 if (strcmp(array_list->member, sub) != 0)
1549 continue;
1550 if (array_list->uuid_set &&
1551 !same_uuid(ra->uuid, array_list->uuid, st->ss->swapuuid))
1552 continue;
1553 dn = container2devname(array_list->container);
1554 if (dn == NULL)
1555 continue;
1556 if (strncmp(dn, ra->text_version+1,
1557 strlen(dn)) != 0 ||
1558 ra->text_version[strlen(dn)+1] != '/') {
1559 free(dn);
1560 continue;
1561 }
1562 free(dn);
1563 /* we have a match */
1564 match = array_list;
1565 if (c->verbose>0)
1566 pr_err("match found for member %s\n",
1567 array_list->member);
1568 break;
1569 }
1570
1571 if (match && match->devname &&
1572 strcasecmp(match->devname, "<ignore>") == 0) {
1573 if (c->verbose > 0)
1574 pr_err("array %s/%s is explicitly ignored by mdadm.conf\n",
1575 match->container, match->member);
1576 continue;
1577 }
1578 if (match)
1579 trustworthy = LOCAL;
1580
1581 mdfd = create_mddev(match ? match->devname : NULL,
1582 ra->name,
1583 c->autof,
1584 trustworthy,
1585 chosen_name);
1586 }
1587 if (only && (!mp || strcmp(mp->devnm, only) != 0))
1588 continue;
1589
1590 if (mdfd < 0) {
1591 pr_err("failed to open %s: %s.\n",
1592 chosen_name, strerror(errno));
1593 return 2;
1594 }
1595
1596 assemble_container_content(st, mdfd, ra, c,
1597 chosen_name, &result);
1598 close(mdfd);
1599 }
1600 if (c->export && result) {
1601 char sep = '=';
1602 printf("MD_STARTED");
1603 if (result & INCR_NO) {
1604 printf("%cno", sep);
1605 sep = ',';
1606 }
1607 if (result & INCR_UNSAFE) {
1608 printf("%cunsafe", sep);
1609 sep = ',';
1610 }
1611 if (result & INCR_ALREADY) {
1612 printf("%calready", sep);
1613 sep = ',';
1614 }
1615 if (result & INCR_YES) {
1616 printf("%cyes", sep);
1617 sep = ',';
1618 }
1619 printf("\n");
1620 }
1621
1622 /* don't move spares to container with volume being activated
1623 when all volumes are blocked */
1624 if (ra_all == ra_blocked)
1625 return 0;
1626
1627 /* Now move all suitable spares from spare container */
1628 domains = domain_from_array(list, st->ss->name);
1629 memcpy(suuid, uuid_zero, sizeof(int[4]));
1630 if (domains &&
1631 (smp = map_by_uuid(&map, suuid)) != NULL &&
1632 (sfd = open(smp->path, O_RDONLY)) >= 0) {
1633 /* spare container found */
1634 struct supertype *sst =
1635 super_imsm.match_metadata_desc("imsm");
1636 struct mdinfo *sinfo;
1637 unsigned long long min_size = 0;
1638 if (st->ss->min_acceptable_spare_size)
1639 min_size = st->ss->min_acceptable_spare_size(st);
1640 if (!sst->ss->load_container(sst, sfd, NULL)) {
1641 close(sfd);
1642 sinfo = container_choose_spares(sst, min_size,
1643 domains, NULL,
1644 st->ss->name, 0);
1645 sst->ss->free_super(sst);
1646 if (sinfo){
1647 int count = 0;
1648 struct mdinfo *disks = sinfo->devs;
1649 while (disks) {
1650 /* move spare from spare
1651 * container to currently
1652 * assembled one
1653 */
1654 if (move_spare(
1655 smp->path,
1656 devname,
1657 makedev(disks->disk.major,
1658 disks->disk.minor)))
1659 count++;
1660 disks = disks->next;
1661 }
1662 if (count)
1663 pr_err("Added %d spare%s to %s\n",
1664 count, count>1?"s":"", devname);
1665 }
1666 sysfs_free(sinfo);
1667 } else
1668 close(sfd);
1669 }
1670 domain_free(domains);
1671 return 0;
1672 }
1673
1674 static void run_udisks(char *arg1, char *arg2)
1675 {
1676 int pid = fork();
1677 int status;
1678 if (pid == 0) {
1679 execl("/usr/bin/udisks", "udisks", arg1, arg2, NULL);
1680 execl("/bin/udisks", "udisks", arg1, arg2, NULL);
1681 exit(1);
1682 }
1683 while (pid > 0 && wait(&status) != pid)
1684 ;
1685 }
1686
1687 /*
1688 * IncrementalRemove - Attempt to see if the passed in device belongs to any
1689 * raid arrays, and if so first fail (if needed) and then remove the device.
1690 *
1691 * @devname - The device we want to remove
1692 * @id_path - name as found in /dev/disk/by-path for this device
1693 *
1694 * Note: the device name must be a kernel name like "sda", so
1695 * that we can find it in /proc/mdstat
1696 */
1697 int IncrementalRemove(char *devname, char *id_path, int verbose)
1698 {
1699 int mdfd;
1700 int rv = 0;
1701 struct mdstat_ent *ent;
1702 struct mddev_dev devlist;
1703 struct mdinfo mdi;
1704 char buf[32];
1705
1706 if (!id_path)
1707 dprintf("incremental removal without --path <id_path> lacks the possibility to re-add new device in this port\n");
1708
1709 if (strchr(devname, '/')) {
1710 pr_err("incremental removal requires a kernel device name, not a file: %s\n", devname);
1711 return 1;
1712 }
1713 ent = mdstat_by_component(devname);
1714 if (!ent) {
1715 if (verbose >= 0)
1716 pr_err("%s does not appear to be a component of any array\n", devname);
1717 return 1;
1718 }
1719 sysfs_init(&mdi, -1, ent->devnm);
1720 mdfd = open_dev_excl(ent->devnm);
1721 if (mdfd > 0) {
1722 close(mdfd);
1723 if (sysfs_get_str(&mdi, NULL, "array_state",
1724 buf, sizeof(buf)) > 0) {
1725 if (strncmp(buf, "active", 6) == 0 ||
1726 strncmp(buf, "clean", 5) == 0)
1727 sysfs_set_str(&mdi, NULL,
1728 "array_state", "read-auto");
1729 }
1730 }
1731 mdfd = open_dev(ent->devnm);
1732 if (mdfd < 0) {
1733 if (verbose >= 0)
1734 pr_err("Cannot open array %s!!\n", ent->dev);
1735 free_mdstat(ent);
1736 return 1;
1737 }
1738
1739 if (id_path) {
1740 struct map_ent *map = NULL, *me;
1741 me = map_by_devnm(&map, ent->devnm);
1742 if (me)
1743 policy_save_path(id_path, me);
1744 map_free(map);
1745 }
1746
1747 memset(&devlist, 0, sizeof(devlist));
1748 devlist.devname = devname;
1749 devlist.disposition = 'f';
1750 /* for a container, we must fail each member array */
1751 if (ent->metadata_version &&
1752 strncmp(ent->metadata_version, "external:", 9) == 0) {
1753 struct mdstat_ent *mdstat = mdstat_read(0, 0);
1754 struct mdstat_ent *memb;
1755 for (memb = mdstat ; memb ; memb = memb->next)
1756 if (is_container_member(memb, ent->dev)) {
1757 int subfd = open_dev(memb->devnm);
1758 if (subfd >= 0) {
1759 rv |= Manage_subdevs(
1760 memb->dev, subfd,
1761 &devlist, verbose, 0,
1762 NULL, 0);
1763 close(subfd);
1764 }
1765 }
1766 free_mdstat(mdstat);
1767 } else
1768 rv |= Manage_subdevs(ent->dev, mdfd, &devlist,
1769 verbose, 0, NULL, 0);
1770 if (rv & 2) {
1771 /* Failed due to EBUSY, try to stop the array.
1772 * Give udisks a chance to unmount it first.
1773 */
1774 int devid = devnm2devid(ent->devnm);
1775 run_udisks("--unmount", map_dev(major(devid),minor(devid), 0));
1776 rv = Manage_stop(ent->dev, mdfd, verbose, 1);
1777 if (rv)
1778 /* At least we can try to trigger a 'remove' */
1779 sysfs_uevent(&mdi, "remove");
1780 if (verbose) {
1781 if (rv)
1782 pr_err("Fail to stop %s too.\n", ent->devnm);
1783 }
1784 } else {
1785 devlist.disposition = 'r';
1786 rv = Manage_subdevs(ent->dev, mdfd, &devlist,
1787 verbose, 0, NULL, 0);
1788 }
1789 close(mdfd);
1790 free_mdstat(ent);
1791 return rv;
1792 }
Unnamed repository; edit this file 'description' to name the repository.