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