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Commit | Line | Data |
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e0d19036 NB |
1 | /* |
2 | * mdstat - parse /proc/mdstat file. Part of: | |
3 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
4 | * | |
e736b623 | 5 | * Copyright (C) 2002-2009 Neil Brown <neilb@suse.de> |
e0d19036 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 | |
e736b623 | 23 | * Email: <neilb@suse.de> |
e0d19036 NB |
24 | */ |
25 | ||
26 | /* | |
27 | * The /proc/mdstat file comes in at least 3 flavours: | |
28 | * In an unpatched 2.2 kernel (md 0.36.6): | |
29 | * Personalities : [n raidx] ... | |
30 | * read_ahead {not set|%d sectors} | |
31 | * md0 : {in}active{ raidX /dev/hda... %d blocks{ maxfault=%d}} | |
32 | * md1 : ..... | |
33 | * | |
34 | * Normally only 4 md lines, but all are listed. | |
35 | * | |
36 | * In a patched 2.2 kernel (md 0.90.0) | |
37 | * Personalities : [raidx] ... | |
38 | * read_ahead {not set|%d sectors} | |
39 | * mdN : {in}active {(readonly)} raidX dev[%d]{(F)} ... %d blocks STATUS RESYNC | |
40 | * ... Only initialised arrays listed | |
8f21823f | 41 | * unused devices: {dev dev ... | <none>} |
e0d19036 NB |
42 | * |
43 | * STATUS is personality dependant: | |
44 | * linear: %dk rounding | |
45 | * raid0: %dk chunks | |
46 | * raid1: [%d/%d] [U_U] ( raid/working. operational or not) | |
47 | * raid5: level 4/5, %dk chunk, algorithm %d [%d/%d] [U_U] | |
48 | * | |
49 | * RESYNC is empty or: | |
50 | * {resync|recovery}=%u%% finish=%u.%umin | |
51 | * or | |
52 | * resync=DELAYED | |
53 | * | |
54 | * In a 2.4 kernel (md 0.90.0/2.4) | |
55 | * Personalities : [raidX] ... | |
56 | * read_ahead {not set|%d sectors} | |
57 | * mdN : {in}active {(read-only)} raidX dev[%d]{(F)} ... | |
58 | * %d blocks STATUS | |
59 | * RESYNC | |
8f21823f | 60 | * unused devices: {dev dev .. | <none>} |
e0d19036 NB |
61 | * |
62 | * STATUS matches 0.90.0/2.2 | |
63 | * RESYNC includes [===>....], | |
64 | * adds a space after {resync|recovery} and before and after '=' | |
65 | * adds a decimal to the recovery percent. | |
66 | * adds (%d/%d) resync amount and max_blocks, before finish. | |
67 | * adds speed=%dK/sec after finish | |
68 | * | |
69 | * | |
70 | * | |
71 | * Out of this we want to extract: | |
72 | * list of devices, active or not | |
73 | * pattern of failed drives (so need number of drives) | |
74 | * percent resync complete | |
75 | * | |
76 | * As continuation is indicated by leading space, we use | |
77 | * conf_line from config.c to read logical lines | |
78 | * | |
79 | */ | |
80 | ||
81 | #include "mdadm.h" | |
82 | #include "dlink.h" | |
dd0781e5 | 83 | #include <sys/select.h> |
549e9569 | 84 | #include <ctype.h> |
e0d19036 | 85 | |
3b57c466 N |
86 | static void free_member_devnames(struct dev_member *m) |
87 | { | |
88 | while(m) { | |
89 | struct dev_member *t = m; | |
90 | ||
91 | m = m->next; | |
92 | free(t->name); | |
93 | free(t); | |
94 | } | |
95 | } | |
96 | ||
0ad6835c | 97 | static int add_member_devname(struct dev_member **m, char *name) |
3b57c466 N |
98 | { |
99 | struct dev_member *new; | |
100 | char *t; | |
101 | ||
102 | if ((t = strchr(name, '[')) == NULL) | |
103 | /* not a device */ | |
0ad6835c | 104 | return 0; |
3b57c466 | 105 | |
503975b9 | 106 | new = xmalloc(sizeof(*new)); |
3b57c466 N |
107 | new->name = strndup(name, t - name); |
108 | new->next = *m; | |
109 | *m = new; | |
0ad6835c | 110 | return 1; |
3b57c466 N |
111 | } |
112 | ||
e0d19036 NB |
113 | void free_mdstat(struct mdstat_ent *ms) |
114 | { | |
115 | while (ms) { | |
116 | struct mdstat_ent *t; | |
3b57c466 N |
117 | free(ms->dev); |
118 | free(ms->level); | |
119 | free(ms->pattern); | |
120 | free(ms->metadata_version); | |
121 | free_member_devnames(ms->members); | |
e0d19036 NB |
122 | t = ms; |
123 | ms = ms->next; | |
124 | free(t); | |
125 | } | |
126 | } | |
127 | ||
dd0781e5 | 128 | static int mdstat_fd = -1; |
22a88995 | 129 | struct mdstat_ent *mdstat_read(int hold, int start) |
e0d19036 NB |
130 | { |
131 | FILE *f; | |
22a88995 | 132 | struct mdstat_ent *all, *rv, **end, **insert_here; |
e0d19036 | 133 | char *line; |
d94a4f62 | 134 | int fd; |
e0d19036 | 135 | |
dd0781e5 NB |
136 | if (hold && mdstat_fd != -1) { |
137 | lseek(mdstat_fd, 0L, 0); | |
d94a4f62 JS |
138 | fd = dup(mdstat_fd); |
139 | if (fd >= 0) | |
140 | f = fdopen(fd, "r"); | |
141 | else | |
142 | return NULL; | |
dd0781e5 NB |
143 | } else |
144 | f = fopen("/proc/mdstat", "r"); | |
e0d19036 NB |
145 | if (f == NULL) |
146 | return NULL; | |
e4dc5106 DL |
147 | else |
148 | fcntl(fileno(f), F_SETFD, FD_CLOEXEC); | |
e0d19036 NB |
149 | |
150 | all = NULL; | |
151 | end = &all; | |
152 | for (; (line = conf_line(f)) ; free_line(line)) { | |
153 | struct mdstat_ent *ent; | |
154 | char *w; | |
4dd2df09 | 155 | char devnm[32]; |
22a88995 | 156 | int in_devs = 0; |
e0d19036 NB |
157 | |
158 | if (strcmp(line, "Personalities")==0) | |
159 | continue; | |
160 | if (strcmp(line, "read_ahead")==0) | |
161 | continue; | |
162 | if (strcmp(line, "unused")==0) | |
163 | continue; | |
22a88995 | 164 | insert_here = NULL; |
e0d19036 | 165 | /* Better be an md line.. */ |
4dd2df09 N |
166 | if (strncmp(line, "md", 2)!= 0 || strlen(line) >= 32 |
167 | || (line[2] != '_' && !isdigit(line[2]))) | |
98c6faba | 168 | continue; |
4dd2df09 | 169 | strcpy(devnm, line); |
e0d19036 | 170 | |
503975b9 | 171 | ent = xmalloc(sizeof(*ent)); |
e0d19036 NB |
172 | ent->dev = ent->level = ent->pattern= NULL; |
173 | ent->next = NULL; | |
9dad51d4 | 174 | ent->percent = RESYNC_NONE; |
e0d19036 | 175 | ent->active = -1; |
e5329c37 | 176 | ent->resync = 0; |
549e9569 NB |
177 | ent->metadata_version = NULL; |
178 | ent->raid_disks = 0; | |
549e9569 | 179 | ent->devcnt = 0; |
3b57c466 | 180 | ent->members = NULL; |
e0d19036 | 181 | |
503975b9 | 182 | ent->dev = xstrdup(line); |
4dd2df09 | 183 | strcpy(ent->devnm, devnm); |
aba69144 | 184 | |
e0d19036 NB |
185 | for (w=dl_next(line); w!= line ; w=dl_next(w)) { |
186 | int l = strlen(w); | |
187 | char *eq; | |
188 | if (strcmp(w, "active")==0) | |
189 | ent->active = 1; | |
b6d7a7fb | 190 | else if (strcmp(w, "inactive")==0) { |
e0d19036 | 191 | ent->active = 0; |
b6d7a7fb JD |
192 | in_devs = 1; |
193 | } else if (ent->active > 0 && | |
e0d19036 | 194 | ent->level == NULL && |
22a88995 | 195 | w[0] != '(' /*readonly*/) { |
503975b9 | 196 | ent->level = xstrdup(w); |
22a88995 NB |
197 | in_devs = 1; |
198 | } else if (in_devs && strcmp(w, "blocks")==0) | |
199 | in_devs = 0; | |
549e9569 | 200 | else if (in_devs) { |
4dd2df09 | 201 | char *ep = strchr(w, '['); |
0ad6835c ML |
202 | ent->devcnt += |
203 | add_member_devname(&ent->members, w); | |
4dd2df09 | 204 | if (ep && strncmp(w, "md", 2)==0) { |
549e9569 NB |
205 | /* This has an md device as a component. |
206 | * If that device is already in the | |
207 | * list, make sure we insert before | |
208 | * there. | |
209 | */ | |
210 | struct mdstat_ent **ih; | |
549e9569 NB |
211 | ih = &all; |
212 | while (ih != insert_here && *ih && | |
4dd2df09 N |
213 | ((int)strlen((*ih)->devnm) != ep-w |
214 | || strncmp((*ih)->devnm, w, ep-w) != 0)) | |
549e9569 NB |
215 | ih = & (*ih)->next; |
216 | insert_here = ih; | |
217 | } | |
218 | } else if (strcmp(w, "super") == 0 && | |
219 | dl_next(w) != line) { | |
220 | w = dl_next(w); | |
503975b9 | 221 | ent->metadata_version = xstrdup(w); |
549e9569 NB |
222 | } else if (w[0] == '[' && isdigit(w[1])) { |
223 | ent->raid_disks = atoi(w+1); | |
22a88995 | 224 | } else if (!ent->pattern && |
e0d19036 NB |
225 | w[0] == '[' && |
226 | (w[1] == 'U' || w[1] == '_')) { | |
503975b9 | 227 | ent->pattern = xstrdup(w+1); |
e0d19036 NB |
228 | if (ent->pattern[l-2]==']') |
229 | ent->pattern[l-2] = '\0'; | |
9dad51d4 | 230 | } else if (ent->percent == RESYNC_NONE && |
e0d19036 NB |
231 | strncmp(w, "re", 2)== 0 && |
232 | w[l-1] == '%' && | |
233 | (eq=strchr(w, '=')) != NULL ) { | |
234 | ent->percent = atoi(eq+1); | |
f94c116f | 235 | if (strncmp(w,"resync", 6)==0) |
e5329c37 | 236 | ent->resync = 1; |
f94c116f N |
237 | else if (strncmp(w, "reshape", 7)==0) |
238 | ent->resync = 2; | |
239 | else | |
240 | ent->resync = 0; | |
9dad51d4 | 241 | } else if (ent->percent == RESYNC_NONE && |
f94c116f N |
242 | (w[0] == 'r' || w[0] == 'c')) { |
243 | if (strncmp(w, "resync", 4)==0) | |
244 | ent->resync = 1; | |
245 | if (strncmp(w, "reshape", 7)==0) | |
246 | ent->resync = 2; | |
247 | if (strncmp(w, "recovery", 8)==0) | |
aa8d7dc7 | 248 | ent->resync = 0; |
f94c116f N |
249 | if (strncmp(w, "check", 5)==0) |
250 | ent->resync = 3; | |
251 | ||
2d3603ba | 252 | if (l > 8 && strcmp(w+l-8, "=DELAYED") == 0) |
9dad51d4 | 253 | ent->percent = RESYNC_DELAYED; |
2d3603ba | 254 | if (l > 8 && strcmp(w+l-8, "=PENDING") == 0) |
9dad51d4 N |
255 | ent->percent = RESYNC_PENDING; |
256 | } else if (ent->percent == RESYNC_NONE && | |
aba69144 | 257 | w[0] >= '0' && |
e0d19036 NB |
258 | w[0] <= '9' && |
259 | w[l-1] == '%') { | |
260 | ent->percent = atoi(w); | |
261 | } | |
262 | } | |
22a88995 NB |
263 | if (insert_here && (*insert_here)) { |
264 | ent->next = *insert_here; | |
265 | *insert_here = ent; | |
266 | } else { | |
267 | *end = ent; | |
268 | end = &ent->next; | |
269 | } | |
e0d19036 | 270 | } |
e4dc5106 | 271 | if (hold && mdstat_fd == -1) { |
dd0781e5 | 272 | mdstat_fd = dup(fileno(f)); |
e4dc5106 DL |
273 | fcntl(mdstat_fd, F_SETFD, FD_CLOEXEC); |
274 | } | |
e0d19036 | 275 | fclose(f); |
22a88995 NB |
276 | |
277 | /* If we might want to start array, | |
278 | * reverse the order, so that components comes before composites | |
279 | */ | |
280 | if (start) { | |
281 | rv = NULL; | |
282 | while (all) { | |
283 | struct mdstat_ent *e = all; | |
284 | all = all->next; | |
285 | e->next = rv; | |
286 | rv = e; | |
287 | } | |
288 | } else rv = all; | |
289 | return rv; | |
e0d19036 | 290 | } |
dd0781e5 NB |
291 | |
292 | void mdstat_wait(int seconds) | |
293 | { | |
294 | fd_set fds; | |
295 | struct timeval tm; | |
0b5ec75e | 296 | int maxfd = 0; |
dd0781e5 | 297 | FD_ZERO(&fds); |
0b5ec75e | 298 | if (mdstat_fd >= 0) { |
dd0781e5 | 299 | FD_SET(mdstat_fd, &fds); |
0b5ec75e N |
300 | maxfd = mdstat_fd; |
301 | } | |
dd0781e5 NB |
302 | tm.tv_sec = seconds; |
303 | tm.tv_usec = 0; | |
0b5ec75e | 304 | select(maxfd + 1, NULL, NULL, &fds, &tm); |
dd0781e5 | 305 | } |
8382f19b | 306 | |
58a4ba2a | 307 | void mdstat_wait_fd(int fd, const sigset_t *sigmask) |
549e9569 NB |
308 | { |
309 | fd_set fds, rfds; | |
5d4d1b26 | 310 | int maxfd = 0; |
549e9569 NB |
311 | |
312 | FD_ZERO(&fds); | |
313 | FD_ZERO(&rfds); | |
314 | if (mdstat_fd >= 0) | |
315 | FD_SET(mdstat_fd, &fds); | |
5d4d1b26 | 316 | |
58a4ba2a | 317 | if (fd >= 0) { |
28005287 N |
318 | struct stat stb; |
319 | fstat(fd, &stb); | |
320 | if ((stb.st_mode & S_IFMT) == S_IFREG) | |
321 | /* Must be a /proc or /sys fd, so expect | |
322 | * POLLPRI | |
323 | * i.e. an 'exceptional' event. | |
324 | */ | |
325 | FD_SET(fd, &fds); | |
326 | else | |
327 | FD_SET(fd, &rfds); | |
5d4d1b26 N |
328 | |
329 | if (fd > maxfd) | |
330 | maxfd = fd; | |
331 | ||
28005287 | 332 | } |
0b5ec75e N |
333 | if (mdstat_fd > maxfd) |
334 | maxfd = mdstat_fd; | |
549e9569 | 335 | |
0b5ec75e | 336 | pselect(maxfd + 1, &rfds, NULL, &fds, |
1ed3f387 | 337 | NULL, sigmask); |
549e9569 NB |
338 | } |
339 | ||
4dd2df09 | 340 | int mddev_busy(char *devnm) |
8382f19b NB |
341 | { |
342 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
343 | struct mdstat_ent *me; | |
344 | ||
345 | for (me = mdstat ; me ; me = me->next) | |
4dd2df09 | 346 | if (strcmp(me->devnm, devnm) == 0) |
8382f19b NB |
347 | break; |
348 | free_mdstat(mdstat); | |
349 | return me != NULL; | |
350 | } | |
3b57c466 N |
351 | |
352 | struct mdstat_ent *mdstat_by_component(char *name) | |
353 | { | |
354 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
355 | ||
356 | while (mdstat) { | |
357 | struct dev_member *m; | |
358 | struct mdstat_ent *ent; | |
359 | if (mdstat->metadata_version && | |
360 | strncmp(mdstat->metadata_version, "external:", 9) == 0 && | |
361 | is_subarray(mdstat->metadata_version+9)) | |
362 | /* don't return subarrays, only containers */ | |
363 | ; | |
364 | else for (m = mdstat->members; m; m = m->next) { | |
365 | if (strcmp(m->name, name) == 0) { | |
366 | free_mdstat(mdstat->next); | |
367 | mdstat->next = NULL; | |
368 | return mdstat; | |
369 | } | |
370 | } | |
371 | ent = mdstat; | |
372 | mdstat = mdstat->next; | |
373 | ent->next = NULL; | |
374 | free_mdstat(ent); | |
375 | } | |
376 | return NULL; | |
377 | } | |
78b10e66 | 378 | |
4dd2df09 | 379 | struct mdstat_ent *mdstat_by_subdev(char *subdev, char *container) |
78b10e66 N |
380 | { |
381 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
4dd2df09 | 382 | struct mdstat_ent *ent = NULL; |
78b10e66 N |
383 | |
384 | while (mdstat) { | |
78b10e66 | 385 | /* metadata version must match: |
4dd2df09 N |
386 | * external:[/-]%s/%s |
387 | * where first %s is 'container' and second %s is 'subdev' | |
78b10e66 | 388 | */ |
4dd2df09 N |
389 | if (ent) |
390 | free_mdstat(ent); | |
78b10e66 N |
391 | ent = mdstat; |
392 | mdstat = mdstat->next; | |
393 | ent->next = NULL; | |
4dd2df09 N |
394 | |
395 | if (ent->metadata_version == NULL || | |
396 | strncmp(ent->metadata_version, "external:", 9) != 0) | |
397 | continue; | |
398 | ||
399 | if (!metadata_container_matches(ent->metadata_version+9, | |
400 | container) || | |
401 | !metadata_subdev_matches(ent->metadata_version+9, | |
402 | subdev)) | |
403 | continue; | |
404 | ||
405 | free_mdstat(mdstat); | |
406 | return ent; | |
78b10e66 N |
407 | } |
408 | return NULL; | |
409 | } |