mdadm-1.6.0
[thirdparty/mdadm.git] / Monitor.c
CommitLineData
52826846 1/*
9a9dab36 2 * mdadm - manage Linux "md" devices aka RAID arrays.
52826846 3 *
cd29a5c8 4 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
52826846
NB
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
9a9dab36 30#include "mdadm.h"
52826846
NB
31#include "md_p.h"
32#include "md_u.h"
e0d19036 33#include <sys/wait.h>
52826846 34#include <sys/signal.h>
98c6faba 35#include <values.h>
52826846
NB
36
37static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd);
38
e0d19036
NB
39static char *percentalerts[] = {
40 "RebuildStarted",
41 "Rebuild20",
42 "Rebuild40",
43 "Rebuild60",
44 "Rebuild80",
45};
46
cd29a5c8 47int Monitor(mddev_dev_t devlist,
52826846 48 char *mailaddr, char *alert_cmd,
aa88f531 49 int period, int daemonise, int scan, int oneshot,
98c6faba 50 char *config, int test)
52826846
NB
51{
52 /*
53 * Every few seconds, scan every md device looking for changes
54 * When a change is found, log it, possibly run the alert command,
55 * and possibly send Email
56 *
57 * For each array, we record:
58 * Update time
59 * active/working/failed/spare drives
60 * State of each device.
e0d19036 61 * %rebuilt if rebuilding
52826846
NB
62 *
63 * If the update time changes, check out all the data again
64 * It is possible that we cannot get the state of each device
65 * due to bugs in the md kernel module.
e0d19036
NB
66 * We also read /proc/mdstat to get rebuild percent,
67 * and to get state on all active devices incase of kernel bug.
52826846 68 *
e0d19036
NB
69 * Events are:
70 * Fail
71 * An active device had Faulty set or Active/Sync removed
72 * FailSpare
73 * A spare device had Faulty set
74 * SpareActive
75 * An active device had a reverse transition
76 * RebuildStarted
77 * percent went from -1 to +ve
78 * Rebuild20 Rebuild40 Rebuild60 Rebuild80
79 * percent went from below to not-below that number
80 * DeviceDisappeared
81 * Couldn't access a device which was previously visible
52826846
NB
82 *
83 * if we detect an array with active<raid and spare==0
84 * we look at other arrays that have same spare-group
85 * If we find one with active==raid and spare>0,
86 * and if we can get_disk_info and find a name
87 * Then we hot-remove and hot-add to the other array
88 *
e0d19036
NB
89 * If devlist is NULL, then we can monitor everything because --scan
90 * was given. We get an initial list from config file and add anything
91 * that appears in /proc/mdstat
52826846
NB
92 */
93
94 struct state {
95 char *devname;
e0d19036 96 int devnum; /* to sync with mdstat info */
52826846
NB
97 long utime;
98 int err;
e0d19036
NB
99 char *spare_group;
100 int active, working, failed, spare, raid;
feb716e9 101 int expected_spares;
52826846 102 int devstate[MD_SB_DISKS];
e0d19036
NB
103 int devid[MD_SB_DISKS];
104 int percent;
52826846
NB
105 struct state *next;
106 } *statelist = NULL;
107 int finished = 0;
e0d19036
NB
108 struct mdstat_ent *mdstat = NULL;
109
d013a55e 110 if (!mailaddr) {
e0d19036 111 mailaddr = conf_get_mailaddr(config);
d013a55e 112 if (mailaddr && ! scan)
56eedc1a 113 fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
d013a55e
NB
114 mailaddr);
115 }
116 if (!alert_cmd) {
e0d19036 117 alert_cmd = conf_get_program(config);
d013a55e 118 if (alert_cmd && ! scan)
56eedc1a 119 fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
d013a55e
NB
120 alert_cmd);
121 }
56eedc1a
NB
122 if (scan && !mailaddr && !alert_cmd) {
123 fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
d013a55e 124 return 1;
56eedc1a 125 }
d013a55e
NB
126
127 if (daemonise) {
128 int pid = fork();
129 if (pid > 0) {
130 printf("%d\n", pid);
131 return 0;
132 }
133 if (pid < 0) {
134 perror("daemonise");
135 return 1;
136 }
137 close(0);
138 open("/dev/null", 3);
139 dup2(0,1);
140 dup2(0,2);
141 setsid();
142 }
e0d19036
NB
143
144 if (devlist == NULL) {
145 mddev_ident_t mdlist = conf_get_ident(config, NULL);
146 for (; mdlist; mdlist=mdlist->next) {
147 struct state *st = malloc(sizeof *st);
148 if (st == NULL)
149 continue;
150 st->devname = strdup(mdlist->devname);
151 st->utime = 0;
152 st->next = statelist;
d013a55e 153 st->err = 0;
98c6faba 154 st->devnum = MAXINT;
e0d19036 155 st->percent = -2;
feb716e9 156 st->expected_spares = mdlist->spare_disks;
e0d19036
NB
157 if (mdlist->spare_group)
158 st->spare_group = strdup(mdlist->spare_group);
159 else
160 st->spare_group = NULL;
161 statelist = st;
162 }
163 } else {
cd29a5c8 164 mddev_dev_t dv;
e0d19036
NB
165 for (dv=devlist ; dv; dv=dv->next) {
166 struct state *st = malloc(sizeof *st);
167 if (st == NULL)
168 continue;
169 st->devname = strdup(dv->devname);
170 st->utime = 0;
171 st->next = statelist;
d013a55e 172 st->err = 0;
98c6faba 173 st->devnum = MAXINT;
e0d19036 174 st->percent = -2;
feb716e9 175 st->expected_spares = -1;
e0d19036
NB
176 st->spare_group = NULL;
177 statelist = st;
178 }
179 }
180
181
182 while (! finished) {
aa88f531 183 int new_found = 0;
e0d19036
NB
184 struct state *st;
185
186 if (mdstat)
187 free_mdstat(mdstat);
dd0781e5 188 mdstat = mdstat_read(oneshot?0:1);
e0d19036
NB
189
190 for (st=statelist; st; st=st->next) {
52826846 191 mdu_array_info_t array;
dd0781e5 192 struct mdstat_ent *mse = NULL, *mse2;
e0d19036 193 char *dev = st->devname;
52826846 194 int fd;
98c6faba 195 unsigned int i;
e0d19036 196
98c6faba
NB
197 if (test)
198 alert("TestMessage", dev, NULL, mailaddr, alert_cmd);
52826846
NB
199 fd = open(dev, O_RDONLY);
200 if (fd < 0) {
201 if (!st->err)
e0d19036
NB
202 alert("DeviceDisappeared", dev, NULL,
203 mailaddr, alert_cmd);
204/* fprintf(stderr, Name ": cannot open %s: %s\n",
52826846 205 dev, strerror(errno));
e0d19036 206*/ st->err=1;
52826846
NB
207 continue;
208 }
209 if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
210 if (!st->err)
e0d19036
NB
211 alert("DeviceDisappeared", dev, NULL,
212 mailaddr, alert_cmd);
213/* fprintf(stderr, Name ": cannot get array info for %s: %s\n",
52826846 214 dev, strerror(errno));
e0d19036 215*/ st->err=1;
52826846
NB
216 close(fd);
217 continue;
218 }
5787fa49
NB
219 if (array.level != 1 && array.level != 5 && array.level != -4) {
220 if (!st->err)
221 alert("DeviceDisappeared", dev, "Wrong-Level",
222 mailaddr, alert_cmd);
223 st->err = 1;
224 close(fd);
225 continue;
226 }
98c6faba 227 if (st->devnum == MAXINT) {
e0d19036
NB
228 struct stat stb;
229 if (fstat(fd, &stb) == 0 &&
98c6faba 230 (S_IFMT&stb.st_mode)==S_IFBLK) {
dd0781e5 231 if (MAJOR(stb.st_rdev) == MD_MAJOR)
98c6faba
NB
232 st->devnum = MINOR(stb.st_rdev);
233 else
234 st->devnum = -1- (MINOR(stb.st_rdev)>>6);
235 }
e0d19036
NB
236 }
237
dd0781e5
NB
238 for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
239 if (mse2->devnum == st->devnum) {
240 mse2->devnum = MAXINT; /* flag it as "used" */
241 mse = mse2;
242 }
e0d19036 243
52826846 244 if (st->utime == array.utime &&
e0d19036
NB
245 st->failed == array.failed_disks &&
246 st->working == array.working_disks &&
247 st->spare == array.spare_disks &&
248 (mse == NULL || (
249 mse->percent == st->percent
250 ))) {
52826846 251 close(fd);
e0d19036 252 st->err = 0;
52826846
NB
253 continue;
254 }
aa88f531
NB
255 if (st->utime == 0 && /* new array */
256 mse && /* is in /proc/mdstat */
257 mse->pattern && strchr(mse->pattern, '_') /* degraded */
258 )
259 alert("DegradedArray", dev, NULL, mailaddr, alert_cmd);
260
feb716e9
NB
261 if (st->utime == 0 && /* new array */
262 st->expected_spares > 0 &&
263 array.spare_disks < st->expected_spares)
264 alert("SparesMissing", dev, NULL, mailaddr, alert_cmd);
e0d19036
NB
265 if (mse &&
266 st->percent == -1 &&
267 mse->percent >= 0)
268 alert("RebuildStarted", dev, NULL, mailaddr, alert_cmd);
269 if (mse &&
270 st->percent >= 0 &&
271 mse->percent >= 0 &&
272 (mse->percent / 20) > (st->percent / 20))
273 alert(percentalerts[mse->percent/20],
274 dev, NULL, mailaddr, alert_cmd);
275
98c6faba
NB
276 if (mse &&
277 mse->percent == -1 &&
278 st->percent >= 0)
279 alert("RebuildFinished", dev, NULL, mailaddr, alert_cmd);
280
e0d19036
NB
281 if (mse)
282 st->percent = mse->percent;
283
284 for (i=0; i<MD_SB_DISKS; i++) {
52826846 285 mdu_disk_info_t disc;
e0d19036
NB
286 int newstate=0;
287 int change;
288 char *dv = NULL;
52826846
NB
289 disc.number = i;
290 if (ioctl(fd, GET_DISK_INFO, &disc)>= 0) {
e0d19036
NB
291 newstate = disc.state;
292 dv = map_dev(disc.major, disc.minor);
5787fa49 293 } else if (mse && mse->pattern && i < strlen(mse->pattern))
e0d19036
NB
294 switch(mse->pattern[i]) {
295 case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
296 case '_': newstate = 0; break;
52826846 297 }
e0d19036
NB
298 change = newstate ^ st->devstate[i];
299 if (st->utime && change && !st->err) {
98c6faba 300 if (i < (unsigned)array.raid_disks &&
e0d19036
NB
301 (((newstate&change)&(1<<MD_DISK_FAULTY)) ||
302 ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) ||
303 ((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
304 )
305 alert("Fail", dev, dv, mailaddr, alert_cmd);
98c6faba 306 else if (i >= (unsigned)array.raid_disks &&
e0d19036
NB
307 (disc.major || disc.minor) &&
308 st->devid[i] == MKDEV(disc.major, disc.minor) &&
309 ((newstate&change)&(1<<MD_DISK_FAULTY))
310 )
311 alert("FailSpare", dev, dv, mailaddr, alert_cmd);
98c6faba 312 else if (i < (unsigned)array.raid_disks &&
e0d19036
NB
313 (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) ||
314 ((newstate&change)&(1<<MD_DISK_ACTIVE)) ||
315 ((newstate&change)&(1<<MD_DISK_SYNC)))
316 )
317 alert("SpareActive", dev, dv, mailaddr, alert_cmd);
52826846 318 }
e0d19036
NB
319 st->devstate[i] = disc.state;
320 st->devid[i] = MKDEV(disc.major, disc.minor);
52826846
NB
321 }
322 close(fd);
323 st->active = array.active_disks;
324 st->working = array.working_disks;
325 st->spare = array.spare_disks;
326 st->failed = array.failed_disks;
327 st->utime = array.utime;
e0d19036
NB
328 st->raid = array.raid_disks;
329 st->err = 0;
52826846 330 }
e0d19036
NB
331 /* now check if there are any new devices found in mdstat */
332 if (scan) {
333 struct mdstat_ent *mse;
334 for (mse=mdstat; mse; mse=mse->next)
98c6faba 335 if (mse->devnum != MAXINT &&
5787fa49
NB
336 (strcmp(mse->level, "raid1")==0 ||
337 strcmp(mse->level, "raid5")==0 ||
338 strcmp(mse->level, "multipath")==0)
339 ) {
e0d19036 340 struct state *st = malloc(sizeof *st);
98c6faba
NB
341 mdu_array_info_t array;
342 int fd;
e0d19036
NB
343 if (st == NULL)
344 continue;
345 st->devname = strdup(get_md_name(mse->devnum));
98c6faba
NB
346 if ((fd = open(st->devname, O_RDONLY)) < 0 ||
347 ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
348 /* no such array */
349 if (fd >=0) close(fd);
350 free(st->devname);
351 free(st);
352 continue;
353 }
dd0781e5 354 close(fd);
e0d19036
NB
355 st->utime = 0;
356 st->next = statelist;
357 st->err = 1;
358 st->devnum = mse->devnum;
359 st->percent = -2;
360 st->spare_group = NULL;
98c6faba 361 st->expected_spares = -1;
e0d19036
NB
362 statelist = st;
363 alert("NewArray", st->devname, NULL, mailaddr, alert_cmd);
aa88f531 364 new_found = 1;
e0d19036
NB
365 }
366 }
367 /* If an array has active < raid && spare == 0 && spare_group != NULL
368 * Look for another array with spare > 0 and active == raid and same spare_group
369 * if found, choose a device and hotremove/hotadd
370 */
371 for (st = statelist; st; st=st->next)
372 if (st->active < st->raid &&
373 st->spare == 0 &&
374 st->spare_group != NULL) {
375 struct state *st2;
376 for (st2=statelist ; st2 ; st2=st2->next)
377 if (st2 != st &&
378 st2->spare > 0 &&
379 st2->active == st2->raid &&
380 st2->spare_group != NULL &&
381 strcmp(st->spare_group, st2->spare_group) == 0) {
382 /* try to remove and add */
383 int fd1 = open(st->devname, O_RDONLY);
384 int fd2 = open(st2->devname, O_RDONLY);
385 int dev = -1;
386 int d;
387 if (fd1 < 0 || fd2 < 0) {
388 if (fd1>=0) close(fd1);
389 if (fd2>=0) close(fd2);
390 continue;
391 }
392 for (d=st2->raid; d<MD_SB_DISKS; d++) {
393 if (st2->devid[d] > 0 &&
394 st2->devstate[d] == 0) {
395 dev = st2->devid[d];
396 break;
397 }
398 }
399 if (dev > 0) {
400 if (ioctl(fd2, HOT_REMOVE_DISK,
401 (unsigned long)dev) == 0) {
402 if (ioctl(fd1, HOT_ADD_DISK,
403 (unsigned long)dev) == 0) {
404 alert("MoveSpare", st->devname, st2->devname, mailaddr, alert_cmd);
405 close(fd1);
406 close(fd2);
407 break;
408 }
409 else ioctl(fd2, HOT_ADD_DISK, (unsigned long) dev);
410 }
411 }
412 close(fd1);
413 close(fd2);
414 }
415 }
aa88f531
NB
416 if (!new_found) {
417 if (oneshot)
418 break;
419 else
dd0781e5 420 mdstat_wait(period);
aa88f531 421 }
98c6faba 422 test = 0;
52826846
NB
423 }
424 return 0;
425}
426
427
428static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd)
429{
cd29a5c8
NB
430 if (!cmd && !mailaddr) {
431 time_t now = time(0);
432
e0d19036 433 printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
cd29a5c8 434 }
52826846
NB
435 if (cmd) {
436 int pid = fork();
437 switch(pid) {
438 default:
439 waitpid(pid, NULL, 0);
440 break;
441 case -1:
442 break;
443 case 0:
444 execl(cmd, cmd, event, dev, disc, NULL);
445 exit(2);
446 }
447 }
aa88f531
NB
448 if (mailaddr &&
449 (strncmp(event, "Fail", 4)==0 ||
98c6faba 450 strncmp(event, "Test", 4)==0 ||
aa88f531 451 strncmp(event, "Degrade", 7)==0)) {
52826846
NB
452 FILE *mp = popen(Sendmail, "w");
453 if (mp) {
454 char hname[256];
455 gethostname(hname, sizeof(hname));
456 signal(SIGPIPE, SIG_IGN);
457 fprintf(mp, "From: " Name " monitoring <root>\n");
458 fprintf(mp, "To: %s\n", mailaddr);
459 fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);
460
461 fprintf(mp, "This is an automatically generated mail message from " Name "\n");
462 fprintf(mp, "running on %s\n\n", hname);
463
464 fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);
465
466 if (disc)
56eedc1a 467 fprintf(mp, "It could be related to component device %s.\n\n", disc);
52826846
NB
468
469 fprintf(mp, "Faithfully yours, etc.\n");
470 fclose(mp);
471 }
472
473 }
474 /* FIXME log the event to syslog maybe */
475}