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Commit | Line | Data |
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8382f19b | 1 | /* |
9e751dc7 | 2 | * mapfile - keep track of uuid <-> array mapping. Part of: |
8382f19b NB |
3 | * mdadm - manage Linux "md" devices aka RAID arrays. |
4 | * | |
9e751dc7 | 5 | * Copyright (C) 2006-2010 Neil Brown <neilb@suse.de> |
8382f19b NB |
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 | ||
9e751dc7 | 31 | /* The mapfile is used to track arrays being created in --incremental |
435b90e7 | 32 | * mode. It particularly allows lookup from UUID to array device, but |
8382f19b NB |
33 | * also allows the array device name to be easily found. |
34 | * | |
35 | * The map file is line based with space separated fields. The fields are: | |
1522c538 NB |
36 | * Device id - mdX or mdpX where X is a number. |
37 | * metadata - 0.90 1.0 1.1 1.2 ddf ... | |
8382f19b NB |
38 | * UUID - uuid of the array |
39 | * path - path where device created: /dev/md/home | |
40 | * | |
9e751dc7 N |
41 | * The best place for the mapfile wold be /var/run/mdadm/map. However |
42 | * it is needed during initramfs early-boot, and /var/run doesn't exist there | |
43 | * and certainly doesn't persist through to normal boot. | |
44 | * So we store it in /dev/.mdadm/map but allow this to be changed at | |
45 | * compile time. via MAP_DIR and MAP_FILE | |
46 | * | |
8382f19b | 47 | */ |
360b4636 | 48 | #include "mdadm.h" |
fc7e81e5 | 49 | #include <sys/file.h> |
360b4636 | 50 | #include <ctype.h> |
8382f19b | 51 | |
9e751dc7 N |
52 | #ifndef MAP_DIR |
53 | #define MAP_DIR "/dev/.mdadm" | |
54 | #define MAP_FILE "map" | |
55 | #endif | |
56 | ||
df65ac70 N |
57 | #define MAP_READ 0 |
58 | #define MAP_NEW 1 | |
59 | #define MAP_LOCK 2 | |
60 | #define MAP_DIRNAME 3 | |
61 | #define mapnames(dir, base) { \ | |
9e751dc7 N |
62 | |
63 | char *mapname[4] = { | |
64 | MAP_DIR "/" MAP_FILE, | |
65 | MAP_DIR "/" MAP_FILE ".new", | |
66 | MAP_DIR "/" MAP_FILE ".lock", | |
67 | MAP_DIR | |
cf3a3d78 | 68 | }; |
8382f19b | 69 | |
753cf905 | 70 | int mapmode[3] = { O_RDONLY, O_RDWR|O_CREAT, O_RDWR|O_CREAT|O_TRUNC }; |
cf3a3d78 | 71 | char *mapsmode[3] = { "r", "w", "w"}; |
8382f19b | 72 | |
9e751dc7 | 73 | FILE *open_map(int modenum) |
cf3a3d78 | 74 | { |
9e751dc7 N |
75 | int fd; |
76 | if ((mapmode[modenum] & O_CREAT)) | |
77 | /* Attempt to create directory, don't worry about | |
78 | * failure. | |
79 | */ | |
80 | (void)mkdir(mapname[MAP_DIRNAME], 0755); | |
81 | fd = open(mapname[modenum], mapmode[modenum], 0600); | |
82 | if (fd >= 0) | |
83 | return fdopen(fd, mapsmode[modenum]); | |
cf3a3d78 N |
84 | return NULL; |
85 | } | |
8382f19b NB |
86 | |
87 | int map_write(struct map_ent *mel) | |
88 | { | |
89 | FILE *f; | |
90 | int err; | |
cf3a3d78 | 91 | |
9e751dc7 | 92 | f = open_map(MAP_NEW); |
8382f19b | 93 | |
8382f19b NB |
94 | if (!f) |
95 | return 0; | |
195254b8 N |
96 | for (; mel; mel = mel->next) { |
97 | if (mel->bad) | |
98 | continue; | |
8382f19b NB |
99 | if (mel->devnum < 0) |
100 | fprintf(f, "mdp%d ", -1-mel->devnum); | |
101 | else | |
102 | fprintf(f, "md%d ", mel->devnum); | |
1522c538 | 103 | fprintf(f, "%s ", mel->metadata); |
8382f19b NB |
104 | fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0], |
105 | mel->uuid[1], mel->uuid[2], mel->uuid[3]); | |
8615dcff | 106 | fprintf(f, "%s\n", mel->path?:""); |
8382f19b NB |
107 | } |
108 | fflush(f); | |
109 | err = ferror(f); | |
110 | fclose(f); | |
111 | if (err) { | |
9e751dc7 | 112 | unlink(mapname[1]); |
8382f19b NB |
113 | return 0; |
114 | } | |
9e751dc7 N |
115 | return rename(mapname[1], |
116 | mapname[0]) == 0; | |
8382f19b NB |
117 | } |
118 | ||
ad5bc697 | 119 | |
cf3a3d78 | 120 | static FILE *lf = NULL; |
ad5bc697 N |
121 | int map_lock(struct map_ent **melp) |
122 | { | |
08415c46 N |
123 | while (lf == NULL) { |
124 | struct stat buf; | |
9e751dc7 | 125 | lf = open_map(MAP_LOCK); |
cf3a3d78 | 126 | if (lf == NULL) |
ad5bc697 | 127 | return -1; |
fc7e81e5 | 128 | if (flock(fileno(lf), LOCK_EX) != 0) { |
cf3a3d78 N |
129 | fclose(lf); |
130 | lf = NULL; | |
ad5bc697 N |
131 | return -1; |
132 | } | |
08415c46 N |
133 | if (fstat(fileno(lf), &buf) != 0 || |
134 | buf.st_nlink == 0) { | |
135 | /* The owner of the lock unlinked it, | |
136 | * so we have a lock on a stale file, | |
137 | * try again | |
138 | */ | |
139 | fclose(lf); | |
140 | lf = NULL; | |
141 | } | |
ad5bc697 N |
142 | } |
143 | if (*melp) | |
144 | map_free(*melp); | |
145 | map_read(melp); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | void map_unlock(struct map_ent **melp) | |
150 | { | |
fc7e81e5 | 151 | if (lf) { |
08415c46 N |
152 | /* must unlink before closing the file, |
153 | * as only the owner of the lock may | |
154 | * unlink the file | |
155 | */ | |
9e751dc7 | 156 | unlink(mapname[2]); |
cf3a3d78 | 157 | fclose(lf); |
fc7e81e5 | 158 | } |
cf3a3d78 | 159 | lf = NULL; |
ad5bc697 N |
160 | } |
161 | ||
8382f19b | 162 | void map_add(struct map_ent **melp, |
1522c538 | 163 | int devnum, char *metadata, int uuid[4], char *path) |
8382f19b NB |
164 | { |
165 | struct map_ent *me = malloc(sizeof(*me)); | |
166 | ||
167 | me->devnum = devnum; | |
1522c538 | 168 | strcpy(me->metadata, metadata); |
8382f19b | 169 | memcpy(me->uuid, uuid, 16); |
8615dcff | 170 | me->path = path ? strdup(path) : NULL; |
8382f19b | 171 | me->next = *melp; |
195254b8 | 172 | me->bad = 0; |
8382f19b NB |
173 | *melp = me; |
174 | } | |
175 | ||
176 | void map_read(struct map_ent **melp) | |
177 | { | |
178 | FILE *f; | |
179 | char buf[8192]; | |
180 | char path[200]; | |
1522c538 NB |
181 | int devnum, uuid[4]; |
182 | char metadata[30]; | |
8382f19b NB |
183 | char nam[4]; |
184 | ||
185 | *melp = NULL; | |
186 | ||
9e751dc7 | 187 | f = open_map(MAP_READ); |
3a56f223 N |
188 | if (!f) { |
189 | RebuildMap(); | |
9e751dc7 | 190 | f = open_map(MAP_READ); |
3a56f223 | 191 | } |
8382f19b NB |
192 | if (!f) |
193 | return; | |
194 | ||
195 | while (fgets(buf, sizeof(buf), f)) { | |
8615dcff | 196 | path[0] = 0; |
c5afc314 | 197 | if (sscanf(buf, " %3[mdp]%d %s %x:%x:%x:%x %200s", |
1522c538 | 198 | nam, &devnum, metadata, uuid, uuid+1, |
8615dcff | 199 | uuid+2, uuid+3, path) >= 7) { |
c5afc314 N |
200 | if (strncmp(nam, "md", 2) != 0) |
201 | continue; | |
202 | if (nam[2] == 'p') | |
8382f19b | 203 | devnum = -1 - devnum; |
1522c538 | 204 | map_add(melp, devnum, metadata, uuid, path); |
8382f19b NB |
205 | } |
206 | } | |
207 | fclose(f); | |
208 | } | |
209 | ||
210 | void map_free(struct map_ent *map) | |
211 | { | |
212 | while (map) { | |
213 | struct map_ent *mp = map; | |
214 | map = mp->next; | |
215 | free(mp->path); | |
216 | free(mp); | |
217 | } | |
218 | } | |
219 | ||
1522c538 | 220 | int map_update(struct map_ent **mpp, int devnum, char *metadata, |
8382f19b NB |
221 | int *uuid, char *path) |
222 | { | |
223 | struct map_ent *map, *mp; | |
224 | int rv; | |
225 | ||
226 | if (mpp && *mpp) | |
227 | map = *mpp; | |
228 | else | |
229 | map_read(&map); | |
230 | ||
231 | for (mp = map ; mp ; mp=mp->next) | |
232 | if (mp->devnum == devnum) { | |
1522c538 | 233 | strcpy(mp->metadata, metadata); |
8382f19b NB |
234 | memcpy(mp->uuid, uuid, 16); |
235 | free(mp->path); | |
8615dcff | 236 | mp->path = path ? strdup(path) : NULL; |
8382f19b NB |
237 | break; |
238 | } | |
239 | if (!mp) | |
1522c538 | 240 | map_add(&map, devnum, metadata, uuid, path); |
a04d5763 N |
241 | if (mpp) |
242 | *mpp = NULL; | |
8382f19b NB |
243 | rv = map_write(map); |
244 | map_free(map); | |
245 | return rv; | |
246 | } | |
247 | ||
248 | void map_delete(struct map_ent **mapp, int devnum) | |
249 | { | |
250 | struct map_ent *mp; | |
251 | ||
252 | if (*mapp == NULL) | |
253 | map_read(mapp); | |
254 | ||
255 | for (mp = *mapp; mp; mp = *mapp) { | |
256 | if (mp->devnum == devnum) { | |
257 | *mapp = mp->next; | |
258 | free(mp->path); | |
259 | free(mp); | |
260 | } else | |
261 | mapp = & mp->next; | |
262 | } | |
263 | } | |
264 | ||
4eb26970 DW |
265 | void map_remove(struct map_ent **mapp, int devnum) |
266 | { | |
267 | if (devnum == NoMdDev) | |
268 | return; | |
269 | ||
270 | map_delete(mapp, devnum); | |
271 | map_write(*mapp); | |
272 | map_free(*mapp); | |
273 | } | |
274 | ||
8382f19b NB |
275 | struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]) |
276 | { | |
277 | struct map_ent *mp; | |
278 | if (!*map) | |
279 | map_read(map); | |
280 | ||
195254b8 N |
281 | for (mp = *map ; mp ; mp = mp->next) { |
282 | if (memcmp(uuid, mp->uuid, 16) != 0) | |
283 | continue; | |
284 | if (!mddev_busy(mp->devnum)) { | |
285 | mp->bad = 1; | |
286 | continue; | |
287 | } | |
288 | return mp; | |
289 | } | |
8382f19b | 290 | return NULL; |
4ccad7b1 | 291 | } |
8382f19b | 292 | |
4ccad7b1 N |
293 | struct map_ent *map_by_devnum(struct map_ent **map, int devnum) |
294 | { | |
295 | struct map_ent *mp; | |
296 | if (!*map) | |
297 | map_read(map); | |
298 | ||
195254b8 N |
299 | for (mp = *map ; mp ; mp = mp->next) { |
300 | if (mp->devnum != devnum) | |
301 | continue; | |
302 | if (!mddev_busy(mp->devnum)) { | |
303 | mp->bad = 1; | |
304 | continue; | |
305 | } | |
306 | return mp; | |
307 | } | |
4ccad7b1 | 308 | return NULL; |
8382f19b | 309 | } |
f2e55ecc N |
310 | |
311 | struct map_ent *map_by_name(struct map_ent **map, char *name) | |
312 | { | |
313 | struct map_ent *mp; | |
314 | if (!*map) | |
315 | map_read(map); | |
316 | ||
317 | for (mp = *map ; mp ; mp = mp->next) { | |
8615dcff N |
318 | if (!mp->path) |
319 | continue; | |
f2e55ecc N |
320 | if (strncmp(mp->path, "/dev/md/", 8) != 0) |
321 | continue; | |
195254b8 N |
322 | if (strcmp(mp->path+8, name) != 0) |
323 | continue; | |
324 | if (!mddev_busy(mp->devnum)) { | |
325 | mp->bad = 1; | |
326 | continue; | |
327 | } | |
328 | return mp; | |
f2e55ecc N |
329 | } |
330 | return NULL; | |
331 | } | |
3a56f223 | 332 | |
f98d41dd DW |
333 | /* sets the proper subarray and container_dev according to the metadata |
334 | * version super_by_fd does this automatically, this routine is meant as | |
335 | * a supplement for guess_super() | |
336 | */ | |
337 | static void set_member_info(struct supertype *st, struct mdstat_ent *ent) | |
338 | { | |
f98d41dd DW |
339 | |
340 | st->subarray[0] = '\0'; | |
341 | ||
2b9aa337 N |
342 | if (ent->metadata_version == NULL || |
343 | strncmp(ent->metadata_version, "external:", 9) != 0) | |
f98d41dd DW |
344 | return; |
345 | ||
2b9aa337 N |
346 | if (is_subarray(&ent->metadata_version[9])) { |
347 | char version[strlen(ent->metadata_version)+1]; | |
348 | char *subarray; | |
f98d41dd DW |
349 | char *name = &version[10]; |
350 | ||
2b9aa337 N |
351 | strcpy(version, ent->metadata_version); |
352 | subarray = strrchr(version, '/'); | |
353 | name = &version[10]; | |
354 | ||
f98d41dd DW |
355 | if (!subarray) |
356 | return; | |
357 | *subarray++ = '\0'; | |
358 | ||
359 | st->container_dev = devname2devnum(name); | |
360 | strncpy(st->subarray, subarray, sizeof(st->subarray)); | |
361 | } | |
362 | } | |
363 | ||
3a56f223 N |
364 | void RebuildMap(void) |
365 | { | |
366 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
367 | struct mdstat_ent *md; | |
368 | struct map_ent *map = NULL; | |
369 | int mdp = get_mdp_major(); | |
360b4636 N |
370 | int require_homehost; |
371 | char sys_hostname[256]; | |
372 | char *homehost = conf_get_homehost(&require_homehost); | |
373 | ||
374 | if (homehost == NULL || strcmp(homehost, "<system>")==0) { | |
375 | if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) { | |
376 | sys_hostname[sizeof(sys_hostname)-1] = 0; | |
377 | homehost = sys_hostname; | |
378 | } | |
379 | } | |
3a56f223 N |
380 | |
381 | for (md = mdstat ; md ; md = md->next) { | |
b526e52d | 382 | struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS); |
3a56f223 N |
383 | struct mdinfo *sd; |
384 | ||
506ffd1e DW |
385 | if (!sra) |
386 | continue; | |
387 | ||
3a56f223 | 388 | for (sd = sra->devs ; sd ; sd = sd->next) { |
360b4636 | 389 | char namebuf[100]; |
3a56f223 N |
390 | char dn[30]; |
391 | int dfd; | |
392 | int ok; | |
393 | struct supertype *st; | |
394 | char *path; | |
395 | struct mdinfo info; | |
396 | ||
397 | sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor); | |
398 | dfd = dev_open(dn, O_RDONLY); | |
399 | if (dfd < 0) | |
400 | continue; | |
401 | st = guess_super(dfd); | |
402 | if ( st == NULL) | |
403 | ok = -1; | |
f98d41dd DW |
404 | else { |
405 | set_member_info(st, md); | |
3a56f223 | 406 | ok = st->ss->load_super(st, dfd, NULL); |
f98d41dd | 407 | } |
3a56f223 N |
408 | close(dfd); |
409 | if (ok != 0) | |
410 | continue; | |
411 | st->ss->getinfo_super(st, &info); | |
60f8cb9b | 412 | if (md->devnum >= 0) |
3a56f223 N |
413 | path = map_dev(MD_MAJOR, md->devnum, 0); |
414 | else | |
415 | path = map_dev(mdp, (-1-md->devnum)<< 6, 0); | |
360b4636 N |
416 | if (path == NULL || |
417 | strncmp(path, "/dev/md/", 8) != 0) { | |
418 | /* We would really like a name that provides | |
419 | * an MD_DEVNAME for udev. | |
420 | * The name needs to be unique both in /dev/md/ | |
421 | * and in this mapfile. | |
422 | * It needs to match watch -I or -As would come | |
423 | * up with. | |
424 | * That means: | |
425 | * Check if array is in mdadm.conf | |
426 | * - if so use that. | |
427 | * determine trustworthy from homehost etc | |
428 | * find a unique name based on metadata name. | |
429 | * | |
430 | */ | |
431 | struct mddev_ident_s *match = conf_match(&info, st); | |
432 | struct stat stb; | |
433 | if (match && match->devname && match->devname[0] == '/') { | |
434 | path = match->devname; | |
435 | if (path[0] != '/') { | |
436 | strcpy(namebuf, "/dev/md/"); | |
437 | strcat(namebuf, path); | |
438 | path = namebuf; | |
439 | } | |
440 | } else { | |
441 | int unum = 0; | |
442 | char *sep = "_"; | |
443 | const char *name; | |
444 | int conflict = 1; | |
445 | if ((homehost == NULL || | |
446 | st->ss->match_home(st, homehost) != 1) && | |
447 | st->ss->match_home(st, "any") != 1 && | |
448 | (require_homehost | |
449 | || ! conf_name_is_free(info.name))) | |
450 | /* require a numeric suffix */ | |
451 | unum = 0; | |
452 | else | |
453 | /* allow name to be used as-is if no conflict */ | |
454 | unum = -1; | |
455 | name = info.name; | |
456 | if (!*name) { | |
457 | name = st->ss->name; | |
458 | if (!isdigit(name[strlen(name)-1]) && | |
459 | unum == -1) { | |
460 | unum = 0; | |
461 | sep = ""; | |
462 | } | |
463 | } | |
464 | if (strchr(name, ':')) | |
465 | /* probably a uniquifying | |
466 | * hostname prefix. Allow | |
467 | * without a suffix | |
468 | */ | |
469 | unum = -1; | |
470 | ||
471 | while (conflict) { | |
472 | if (unum >= 0) | |
473 | sprintf(namebuf, "/dev/md/%s%s%d", | |
474 | name, sep, unum); | |
475 | else | |
476 | sprintf(namebuf, "/dev/md/%s", | |
477 | name); | |
478 | unum++; | |
479 | if (lstat(namebuf, &stb) != 0 && | |
480 | (map == NULL || | |
481 | !map_by_name(&map, namebuf+8))) | |
482 | conflict = 0; | |
483 | } | |
484 | path = namebuf; | |
485 | } | |
486 | } | |
8a659c33 N |
487 | map_add(&map, md->devnum, |
488 | info.text_version, | |
8615dcff | 489 | info.uuid, path); |
3a56f223 N |
490 | st->ss->free_super(st); |
491 | break; | |
492 | } | |
8a659c33 | 493 | sysfs_free(sra); |
3a56f223 | 494 | } |
7bf59f5c DL |
495 | /* Only trigger a change if we wrote a new map file */ |
496 | if (map_write(map)) | |
497 | for (md = mdstat ; md ; md = md->next) { | |
498 | struct mdinfo *sra = sysfs_read(-1, md->devnum, | |
499 | GET_VERSION); | |
b526e52d DW |
500 | if (sra) |
501 | sysfs_uevent(sra, "change"); | |
7bf59f5c DL |
502 | sysfs_free(sra); |
503 | } | |
3a56f223 | 504 | map_free(map); |
78fbcc10 | 505 | free_mdstat(mdstat); |
3a56f223 | 506 | } |