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git.ipfire.org Git - thirdparty/mdadm.git/blob - mdstat.c
2 * mdstat - parse /proc/mdstat file. Part of:
3 * mdadm - manage Linux "md" devices aka RAID arrays.
5 * Copyright (C) 2002-2009 Neil Brown <neilb@suse.de>
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.
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.
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
23 * Email: <neilb@suse.de>
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}}
34 * Normally only 4 md lines, but all are listed.
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
41 * unused devices: {dev dev ... | <none>}
43 * STATUS is personality dependant:
44 * linear: %dk rounding
46 * raid1: [%d/%d] [U_U] ( raid/working. operational or not)
47 * raid5: level 4/5, %dk chunk, algorithm %d [%d/%d] [U_U]
50 * {resync|recovery}=%u%% finish=%u.%umin
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)} ...
60 * unused devices: {dev dev .. | <none>}
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
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
76 * As continuation is indicated by leading space, we use
77 * conf_line from config.c to read logical lines
83 #include <sys/select.h>
86 static void free_member_devnames(struct dev_member
*m
)
89 struct dev_member
*t
= m
;
97 static int add_member_devname(struct dev_member
**m
, char *name
)
99 struct dev_member
*new;
102 if ((t
= strchr(name
, '[')) == NULL
)
106 new = xmalloc(sizeof(*new));
107 new->name
= strndup(name
, t
- name
);
113 void free_mdstat(struct mdstat_ent
*ms
)
116 struct mdstat_ent
*t
;
119 free(ms
->metadata_version
);
120 free_member_devnames(ms
->members
);
127 static int mdstat_fd
= -1;
128 struct mdstat_ent
*mdstat_read(int hold
, int start
)
131 struct mdstat_ent
*all
, *rv
, **end
, **insert_here
;
135 if (hold
&& mdstat_fd
!= -1) {
136 off_t offset
= lseek(mdstat_fd
, 0L, 0);
137 if (offset
== (off_t
)-1) {
146 f
= fopen("/proc/mdstat", "r");
150 fcntl(fileno(f
), F_SETFD
, FD_CLOEXEC
);
154 for (; (line
= conf_line(f
)) ; free_line(line
)) {
155 struct mdstat_ent
*ent
;
160 if (strcmp(line
, "Personalities") == 0)
162 if (strcmp(line
, "read_ahead") == 0)
164 if (strcmp(line
, "unused") == 0)
167 /* Better be an md line.. */
168 if (strncmp(line
, "md", 2)!= 0 || strlen(line
) >= 32 ||
169 (line
[2] != '_' && !isdigit(line
[2])))
173 ent
= xmalloc(sizeof(*ent
));
174 ent
->level
= ent
->pattern
= NULL
;
176 ent
->percent
= RESYNC_NONE
;
179 ent
->metadata_version
= NULL
;
184 strcpy(ent
->devnm
, devnm
);
186 for (w
=dl_next(line
); w
!= line
; w
=dl_next(w
)) {
189 if (strcmp(w
, "active") == 0)
191 else if (strcmp(w
, "inactive") == 0) {
194 } else if (ent
->active
> 0 &&
195 ent
->level
== NULL
&&
196 w
[0] != '(' /*readonly*/) {
197 ent
->level
= xstrdup(w
);
199 } else if (in_devs
&& strcmp(w
, "blocks") == 0)
202 char *ep
= strchr(w
, '[');
204 add_member_devname(&ent
->members
, w
);
205 if (ep
&& strncmp(w
, "md", 2) == 0) {
206 /* This has an md device as a component.
207 * If that device is already in the
208 * list, make sure we insert before
211 struct mdstat_ent
**ih
;
213 while (ih
!= insert_here
&& *ih
&&
214 ((int)strlen((*ih
)->devnm
) !=
216 strncmp((*ih
)->devnm
, w
,
221 } else if (strcmp(w
, "super") == 0 &&
222 dl_next(w
) != line
) {
224 ent
->metadata_version
= xstrdup(w
);
225 } else if (w
[0] == '[' && isdigit(w
[1])) {
226 ent
->raid_disks
= atoi(w
+1);
227 } else if (!ent
->pattern
&&
229 (w
[1] == 'U' || w
[1] == '_')) {
230 ent
->pattern
= xstrdup(w
+1);
231 if (ent
->pattern
[l
-2] == ']')
232 ent
->pattern
[l
-2] = '\0';
233 } else if (ent
->percent
== RESYNC_NONE
&&
234 strncmp(w
, "re", 2) == 0 &&
236 (eq
= strchr(w
, '=')) != NULL
) {
237 ent
->percent
= atoi(eq
+1);
238 if (strncmp(w
,"resync", 6) == 0)
240 else if (strncmp(w
, "reshape", 7) == 0)
244 } else if (ent
->percent
== RESYNC_NONE
&&
245 (w
[0] == 'r' || w
[0] == 'c')) {
246 if (strncmp(w
, "resync", 6) == 0)
248 if (strncmp(w
, "reshape", 7) == 0)
250 if (strncmp(w
, "recovery", 8) == 0)
252 if (strncmp(w
, "check", 5) == 0)
255 if (l
> 8 && strcmp(w
+l
-8, "=DELAYED") == 0)
256 ent
->percent
= RESYNC_DELAYED
;
257 if (l
> 8 && strcmp(w
+l
-8, "=PENDING") == 0)
258 ent
->percent
= RESYNC_PENDING
;
259 if (l
> 7 && strcmp(w
+l
-7, "=REMOTE") == 0)
260 ent
->percent
= RESYNC_REMOTE
;
261 } else if (ent
->percent
== RESYNC_NONE
&&
265 ent
->percent
= atoi(w
);
268 if (insert_here
&& (*insert_here
)) {
269 ent
->next
= *insert_here
;
276 if (hold
&& mdstat_fd
== -1) {
277 mdstat_fd
= dup(fileno(f
));
278 fcntl(mdstat_fd
, F_SETFD
, FD_CLOEXEC
);
282 /* If we might want to start array,
283 * reverse the order, so that components comes before composites
288 struct mdstat_ent
*e
= all
;
298 void mdstat_close(void)
306 * function: mdstat_wait
307 * Description: Function waits for event on mdstat.
309 * seconds - timeout for waiting
311 * > 0 - detected event
313 * < 0 - detected error
315 int mdstat_wait(int seconds
)
321 if (mdstat_fd
>= 0) {
322 FD_SET(mdstat_fd
, &fds
);
330 return select(maxfd
+ 1, NULL
, NULL
, &fds
, &tm
);
333 void mdstat_wait_fd(int fd
, const sigset_t
*sigmask
)
341 FD_SET(mdstat_fd
, &fds
);
346 if ((stb
.st_mode
& S_IFMT
) == S_IFREG
)
347 /* Must be a /proc or /sys fd, so expect
349 * i.e. an 'exceptional' event.
359 if (mdstat_fd
> maxfd
)
362 pselect(maxfd
+ 1, &rfds
, NULL
, &fds
,
366 int mddev_busy(char *devnm
)
368 struct mdstat_ent
*mdstat
= mdstat_read(0, 0);
369 struct mdstat_ent
*me
;
371 for (me
= mdstat
; me
; me
= me
->next
)
372 if (strcmp(me
->devnm
, devnm
) == 0)
378 struct mdstat_ent
*mdstat_by_component(char *name
)
380 struct mdstat_ent
*mdstat
= mdstat_read(0, 0);
383 struct dev_member
*m
;
384 struct mdstat_ent
*ent
;
385 if (mdstat
->metadata_version
&&
386 strncmp(mdstat
->metadata_version
, "external:", 9) == 0 &&
387 is_subarray(mdstat
->metadata_version
+9))
388 /* don't return subarrays, only containers */
390 else for (m
= mdstat
->members
; m
; m
= m
->next
) {
391 if (strcmp(m
->name
, name
) == 0) {
392 free_mdstat(mdstat
->next
);
398 mdstat
= mdstat
->next
;
405 struct mdstat_ent
*mdstat_by_subdev(char *subdev
, char *container
)
407 struct mdstat_ent
*mdstat
= mdstat_read(0, 0);
408 struct mdstat_ent
*ent
= NULL
;
411 /* metadata version must match:
413 * where first %s is 'container' and second %s is 'subdev'
418 mdstat
= mdstat
->next
;
421 if (ent
->metadata_version
== NULL
||
422 strncmp(ent
->metadata_version
, "external:", 9) != 0)
425 if (!metadata_container_matches(ent
->metadata_version
+9,
427 !metadata_subdev_matches(ent
->metadata_version
+9,