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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 N |
105 | |
106 | new = malloc(sizeof(*new)); | |
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 NB |
133 | char *line; |
134 | ||
dd0781e5 NB |
135 | if (hold && mdstat_fd != -1) { |
136 | lseek(mdstat_fd, 0L, 0); | |
137 | f = fdopen(dup(mdstat_fd), "r"); | |
138 | } else | |
139 | f = fopen("/proc/mdstat", "r"); | |
e0d19036 NB |
140 | if (f == NULL) |
141 | return NULL; | |
e4dc5106 DL |
142 | else |
143 | fcntl(fileno(f), F_SETFD, FD_CLOEXEC); | |
e0d19036 NB |
144 | |
145 | all = NULL; | |
146 | end = &all; | |
147 | for (; (line = conf_line(f)) ; free_line(line)) { | |
148 | struct mdstat_ent *ent; | |
149 | char *w; | |
98c6faba | 150 | int devnum; |
22a88995 | 151 | int in_devs = 0; |
98c6faba | 152 | char *ep; |
e0d19036 NB |
153 | |
154 | if (strcmp(line, "Personalities")==0) | |
155 | continue; | |
156 | if (strcmp(line, "read_ahead")==0) | |
157 | continue; | |
158 | if (strcmp(line, "unused")==0) | |
159 | continue; | |
22a88995 | 160 | insert_here = NULL; |
e0d19036 | 161 | /* Better be an md line.. */ |
98c6faba NB |
162 | if (strncmp(line, "md", 2)!= 0) |
163 | continue; | |
164 | if (strncmp(line, "md_d", 4) == 0) | |
165 | devnum = -1-strtoul(line+4, &ep, 10); | |
166 | else if (strncmp(line, "md", 2) == 0) | |
167 | devnum = strtoul(line+2, &ep, 10); | |
168 | else | |
169 | continue; | |
170 | if (ep == NULL || *ep ) { | |
171 | /* fprintf(stderr, Name ": bad /proc/mdstat line starts: %s\n", line); */ | |
e0d19036 NB |
172 | continue; |
173 | } | |
174 | ||
175 | ent = malloc(sizeof(*ent)); | |
176 | if (!ent) { | |
177 | fprintf(stderr, Name ": malloc failed reading /proc/mdstat.\n"); | |
178 | free_line(line); | |
dd0781e5 | 179 | break; |
e0d19036 NB |
180 | } |
181 | ent->dev = ent->level = ent->pattern= NULL; | |
182 | ent->next = NULL; | |
183 | ent->percent = -1; | |
184 | ent->active = -1; | |
e5329c37 | 185 | ent->resync = 0; |
549e9569 NB |
186 | ent->metadata_version = NULL; |
187 | ent->raid_disks = 0; | |
188 | ent->chunk_size = 0; | |
189 | ent->devcnt = 0; | |
3b57c466 | 190 | ent->members = NULL; |
e0d19036 NB |
191 | |
192 | ent->dev = strdup(line); | |
98c6faba | 193 | ent->devnum = devnum; |
aba69144 | 194 | |
e0d19036 NB |
195 | for (w=dl_next(line); w!= line ; w=dl_next(w)) { |
196 | int l = strlen(w); | |
197 | char *eq; | |
198 | if (strcmp(w, "active")==0) | |
199 | ent->active = 1; | |
b6d7a7fb | 200 | else if (strcmp(w, "inactive")==0) { |
e0d19036 | 201 | ent->active = 0; |
b6d7a7fb JD |
202 | in_devs = 1; |
203 | } else if (ent->active > 0 && | |
e0d19036 | 204 | ent->level == NULL && |
22a88995 | 205 | w[0] != '(' /*readonly*/) { |
e0d19036 | 206 | ent->level = strdup(w); |
22a88995 NB |
207 | in_devs = 1; |
208 | } else if (in_devs && strcmp(w, "blocks")==0) | |
209 | in_devs = 0; | |
549e9569 | 210 | else if (in_devs) { |
0ad6835c ML |
211 | ent->devcnt += |
212 | add_member_devname(&ent->members, w); | |
549e9569 NB |
213 | if (strncmp(w, "md", 2)==0) { |
214 | /* This has an md device as a component. | |
215 | * If that device is already in the | |
216 | * list, make sure we insert before | |
217 | * there. | |
218 | */ | |
219 | struct mdstat_ent **ih; | |
77472ff8 | 220 | int dn2 = devname2devnum(w); |
549e9569 NB |
221 | ih = &all; |
222 | while (ih != insert_here && *ih && | |
223 | (*ih)->devnum != dn2) | |
224 | ih = & (*ih)->next; | |
225 | insert_here = ih; | |
226 | } | |
227 | } else if (strcmp(w, "super") == 0 && | |
228 | dl_next(w) != line) { | |
229 | w = dl_next(w); | |
230 | ent->metadata_version = strdup(w); | |
231 | } else if (w[0] == '[' && isdigit(w[1])) { | |
232 | ent->raid_disks = atoi(w+1); | |
22a88995 | 233 | } else if (!ent->pattern && |
e0d19036 NB |
234 | w[0] == '[' && |
235 | (w[1] == 'U' || w[1] == '_')) { | |
236 | ent->pattern = strdup(w+1); | |
237 | if (ent->pattern[l-2]==']') | |
238 | ent->pattern[l-2] = '\0'; | |
239 | } else if (ent->percent == -1 && | |
240 | strncmp(w, "re", 2)== 0 && | |
241 | w[l-1] == '%' && | |
242 | (eq=strchr(w, '=')) != NULL ) { | |
243 | ent->percent = atoi(eq+1); | |
e5329c37 NB |
244 | if (strncmp(w,"resync", 4)==0) |
245 | ent->resync = 1; | |
246 | } else if (ent->percent == -1 && | |
247 | strncmp(w, "resync", 4)==0) { | |
248 | ent->resync = 1; | |
e0d19036 | 249 | } else if (ent->percent == -1 && |
aba69144 | 250 | w[0] >= '0' && |
e0d19036 NB |
251 | w[0] <= '9' && |
252 | w[l-1] == '%') { | |
253 | ent->percent = atoi(w); | |
254 | } | |
255 | } | |
22a88995 NB |
256 | if (insert_here && (*insert_here)) { |
257 | ent->next = *insert_here; | |
258 | *insert_here = ent; | |
259 | } else { | |
260 | *end = ent; | |
261 | end = &ent->next; | |
262 | } | |
e0d19036 | 263 | } |
e4dc5106 | 264 | if (hold && mdstat_fd == -1) { |
dd0781e5 | 265 | mdstat_fd = dup(fileno(f)); |
e4dc5106 DL |
266 | fcntl(mdstat_fd, F_SETFD, FD_CLOEXEC); |
267 | } | |
e0d19036 | 268 | fclose(f); |
22a88995 NB |
269 | |
270 | /* If we might want to start array, | |
271 | * reverse the order, so that components comes before composites | |
272 | */ | |
273 | if (start) { | |
274 | rv = NULL; | |
275 | while (all) { | |
276 | struct mdstat_ent *e = all; | |
277 | all = all->next; | |
278 | e->next = rv; | |
279 | rv = e; | |
280 | } | |
281 | } else rv = all; | |
282 | return rv; | |
e0d19036 | 283 | } |
dd0781e5 NB |
284 | |
285 | void mdstat_wait(int seconds) | |
286 | { | |
287 | fd_set fds; | |
288 | struct timeval tm; | |
0b5ec75e | 289 | int maxfd = 0; |
dd0781e5 | 290 | FD_ZERO(&fds); |
0b5ec75e | 291 | if (mdstat_fd >= 0) { |
dd0781e5 | 292 | FD_SET(mdstat_fd, &fds); |
0b5ec75e N |
293 | maxfd = mdstat_fd; |
294 | } | |
dd0781e5 NB |
295 | tm.tv_sec = seconds; |
296 | tm.tv_usec = 0; | |
0b5ec75e | 297 | select(maxfd + 1, NULL, NULL, &fds, &tm); |
dd0781e5 | 298 | } |
8382f19b | 299 | |
58a4ba2a | 300 | void mdstat_wait_fd(int fd, const sigset_t *sigmask) |
549e9569 NB |
301 | { |
302 | fd_set fds, rfds; | |
5d4d1b26 | 303 | int maxfd = 0; |
549e9569 NB |
304 | |
305 | FD_ZERO(&fds); | |
306 | FD_ZERO(&rfds); | |
307 | if (mdstat_fd >= 0) | |
308 | FD_SET(mdstat_fd, &fds); | |
5d4d1b26 | 309 | |
58a4ba2a | 310 | if (fd >= 0) { |
28005287 N |
311 | struct stat stb; |
312 | fstat(fd, &stb); | |
313 | if ((stb.st_mode & S_IFMT) == S_IFREG) | |
314 | /* Must be a /proc or /sys fd, so expect | |
315 | * POLLPRI | |
316 | * i.e. an 'exceptional' event. | |
317 | */ | |
318 | FD_SET(fd, &fds); | |
319 | else | |
320 | FD_SET(fd, &rfds); | |
5d4d1b26 N |
321 | |
322 | if (fd > maxfd) | |
323 | maxfd = fd; | |
324 | ||
28005287 | 325 | } |
0b5ec75e N |
326 | if (mdstat_fd > maxfd) |
327 | maxfd = mdstat_fd; | |
549e9569 | 328 | |
0b5ec75e | 329 | pselect(maxfd + 1, &rfds, NULL, &fds, |
1ed3f387 | 330 | NULL, sigmask); |
549e9569 NB |
331 | } |
332 | ||
8382f19b NB |
333 | int mddev_busy(int devnum) |
334 | { | |
335 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
336 | struct mdstat_ent *me; | |
337 | ||
338 | for (me = mdstat ; me ; me = me->next) | |
339 | if (me->devnum == devnum) | |
340 | break; | |
341 | free_mdstat(mdstat); | |
342 | return me != NULL; | |
343 | } | |
3b57c466 N |
344 | |
345 | struct mdstat_ent *mdstat_by_component(char *name) | |
346 | { | |
347 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
348 | ||
349 | while (mdstat) { | |
350 | struct dev_member *m; | |
351 | struct mdstat_ent *ent; | |
352 | if (mdstat->metadata_version && | |
353 | strncmp(mdstat->metadata_version, "external:", 9) == 0 && | |
354 | is_subarray(mdstat->metadata_version+9)) | |
355 | /* don't return subarrays, only containers */ | |
356 | ; | |
357 | else for (m = mdstat->members; m; m = m->next) { | |
358 | if (strcmp(m->name, name) == 0) { | |
359 | free_mdstat(mdstat->next); | |
360 | mdstat->next = NULL; | |
361 | return mdstat; | |
362 | } | |
363 | } | |
364 | ent = mdstat; | |
365 | mdstat = mdstat->next; | |
366 | ent->next = NULL; | |
367 | free_mdstat(ent); | |
368 | } | |
369 | return NULL; | |
370 | } |