Change MAJOR() etc to major() etc
[thirdparty/mdadm.git] / Monitor.c
1 /*
2  * mdadm - manage Linux "md" devices aka RAID arrays.
3  *
4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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
30 #include        "mdadm.h"
31 #include        "md_p.h"
32 #include        "md_u.h"
33 #include        <sys/wait.h>
34 #include        <sys/signal.h>
35 #include        <values.h>
36
37 static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd);
38
39 static char *percentalerts[] = { 
40         "RebuildStarted",
41         "Rebuild20",
42         "Rebuild40",
43         "Rebuild60",
44         "Rebuild80",
45 };
46
47 int Monitor(mddev_dev_t devlist,
48             char *mailaddr, char *alert_cmd,
49             int period, int daemonise, int scan, int oneshot,
50             char *config, int test, char* pidfile)
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.
61          *   %rebuilt if rebuilding
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.
66          * We also read /proc/mdstat to get rebuild percent,
67          * and to get state on all active devices incase of kernel bug.
68          *
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
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          *
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
92          */
93
94         struct state {
95                 char *devname;
96                 int devnum;     /* to sync with mdstat info */
97                 long utime;
98                 int err;
99                 char *spare_group;
100                 int active, working, failed, spare, raid;
101                 int expected_spares;
102                 int devstate[MD_SB_DISKS];
103                 int devid[MD_SB_DISKS];
104                 int percent;
105                 struct state *next;
106         } *statelist = NULL;
107         int finished = 0;
108         struct mdstat_ent *mdstat = NULL;
109
110         if (!mailaddr) {
111                 mailaddr = conf_get_mailaddr(config);
112                 if (mailaddr && ! scan)
113                         fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
114                                mailaddr);
115         }
116         if (!alert_cmd) {
117                 alert_cmd = conf_get_program(config);
118                 if (alert_cmd && ! scan)
119                         fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
120                                alert_cmd);
121         }
122         if (scan && !mailaddr && !alert_cmd) {
123                 fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
124                 return 1;
125         }
126
127         if (daemonise) {
128                 int pid = fork();
129                 if (pid > 0) {
130                         if (!pidfile)
131                                 printf("%d\n", pid);
132                         else {
133                                 FILE *pid_file;
134                                 pid_file=fopen(pidfile, "w");
135                                 if (!pid_file)
136                                         perror("cannot create pid file");
137                                 else {
138                                         fprintf(pid_file,"%d\n", pid);
139                                         fclose(pid_file);
140                                 }
141                         }
142                         return 0;
143                 }
144                 if (pid < 0) {
145                         perror("daemonise");
146                         return 1;
147                 }
148                 close(0);
149                 open("/dev/null", 3);
150                 dup2(0,1);
151                 dup2(0,2);
152                 setsid();
153         }
154
155         if (devlist == NULL) {
156                 mddev_ident_t mdlist = conf_get_ident(config, NULL);
157                 for (; mdlist; mdlist=mdlist->next) {
158                         struct state *st = malloc(sizeof *st);
159                         if (st == NULL)
160                                 continue;
161                         st->devname = strdup(mdlist->devname);
162                         st->utime = 0;
163                         st->next = statelist;
164                         st->err = 0;
165                         st->devnum = MAXINT;
166                         st->percent = -2;
167                         st->expected_spares = mdlist->spare_disks;
168                         if (mdlist->spare_group)
169                                 st->spare_group = strdup(mdlist->spare_group);
170                         else
171                                 st->spare_group = NULL;
172                         statelist = st;
173                 }
174         } else {
175                 mddev_dev_t dv;
176                 for (dv=devlist ; dv; dv=dv->next) {
177                         mddev_ident_t mdlist = conf_get_ident(config, dv->devname);
178                         struct state *st = malloc(sizeof *st);
179                         if (st == NULL)
180                                 continue;
181                         st->devname = strdup(dv->devname);
182                         st->utime = 0;
183                         st->next = statelist;
184                         st->err = 0;
185                         st->devnum = MAXINT;
186                         st->percent = -2;
187                         st->expected_spares = -1;
188                         st->spare_group = NULL;
189                         if (mdlist) {
190                                 st->expected_spares = mdlist->spare_disks;
191                                 if (mdlist->spare_group)
192                                         st->spare_group = strdup(mdlist->spare_group);
193                         }
194                         statelist = st;
195                 }
196         }
197
198
199         while (! finished) {
200                 int new_found = 0;
201                 struct state *st;
202
203                 if (mdstat)
204                         free_mdstat(mdstat);
205                 mdstat = mdstat_read(oneshot?0:1);
206
207                 for (st=statelist; st; st=st->next) {
208                         mdu_array_info_t array;
209                         struct mdstat_ent *mse = NULL, *mse2;
210                         char *dev = st->devname;
211                         int fd;
212                         unsigned int i;
213
214                         if (test)
215                                 alert("TestMessage", dev, NULL, mailaddr, alert_cmd);
216                         fd = open(dev, O_RDONLY);
217                         if (fd < 0) {
218                                 if (!st->err)
219                                         alert("DeviceDisappeared", dev, NULL,
220                                               mailaddr, alert_cmd);
221 /*                                      fprintf(stderr, Name ": cannot open %s: %s\n",
222                                                 dev, strerror(errno));
223 */                              st->err=1;
224                                 continue;
225                         }
226                         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
227                                 if (!st->err)
228                                         alert("DeviceDisappeared", dev, NULL,
229                                               mailaddr, alert_cmd);
230 /*                                      fprintf(stderr, Name ": cannot get array info for %s: %s\n",
231                                                 dev, strerror(errno));
232 */                              st->err=1;
233                                 close(fd);
234                                 continue;
235                         }
236                         if (array.level != 1 && array.level != 5 && array.level != -4 &&
237                                 array.level != 6 && array.level != 10) {
238                                 if (!st->err)
239                                         alert("DeviceDisappeared", dev, "Wrong-Level",
240                                               mailaddr, alert_cmd);
241                                 st->err = 1;
242                                 close(fd);
243                                 continue;
244                         }
245                         if (st->devnum == MAXINT) {
246                                 struct stat stb;
247                                 if (fstat(fd, &stb) == 0 &&
248                                     (S_IFMT&stb.st_mode)==S_IFBLK) {
249                                         if (major(stb.st_rdev) == MD_MAJOR)
250                                                 st->devnum = minor(stb.st_rdev);
251                                         else
252                                                 st->devnum = -1- (minor(stb.st_rdev)>>6);
253                                 }
254                         }
255
256                         for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
257                                 if (mse2->devnum == st->devnum) {
258                                         mse2->devnum = MAXINT; /* flag it as "used" */
259                                         mse = mse2;
260                                 }
261
262                         if (st->utime == array.utime &&
263                             st->failed == array.failed_disks &&
264                             st->working == array.working_disks &&
265                             st->spare == array.spare_disks &&
266                             (mse == NULL  || (
267                                     mse->percent == st->percent
268                                     ))) {
269                                 close(fd);
270                                 st->err = 0;
271                                 continue;
272                         }
273                         if (st->utime == 0 && /* new array */
274                             mse &&      /* is in /proc/mdstat */
275                             mse->pattern && strchr(mse->pattern, '_') /* degraded */
276                                 )
277                                 alert("DegradedArray", dev, NULL, mailaddr, alert_cmd);
278
279                         if (st->utime == 0 && /* new array */
280                             st->expected_spares > 0 && 
281                             array.spare_disks < st->expected_spares) 
282                                 alert("SparesMissing", dev, NULL, mailaddr, alert_cmd);
283                         if (mse &&
284                             st->percent == -1 && 
285                             mse->percent >= 0)
286                                 alert("RebuildStarted", dev, NULL, mailaddr, alert_cmd);
287                         if (mse &&
288                             st->percent >= 0 &&
289                             mse->percent >= 0 &&
290                             (mse->percent / 20) > (st->percent / 20))
291                                 alert(percentalerts[mse->percent/20],
292                                       dev, NULL, mailaddr, alert_cmd);
293
294                         if (mse &&
295                             mse->percent == -1 &&
296                             st->percent >= 0)
297                                 alert("RebuildFinished", dev, NULL, mailaddr, alert_cmd);
298
299                         if (mse)
300                                 st->percent = mse->percent;
301                                         
302                         for (i=0; i<MD_SB_DISKS; i++) {
303                                 mdu_disk_info_t disc;
304                                 int newstate=0;
305                                 int change;
306                                 char *dv = NULL;
307                                 disc.number = i;
308                                 if (ioctl(fd, GET_DISK_INFO, &disc)>= 0) {
309                                         newstate = disc.state;
310                                         dv = map_dev(disc.major, disc.minor);
311                                 } else if (mse &&  mse->pattern && i < strlen(mse->pattern))
312                                         switch(mse->pattern[i]) {
313                                         case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
314                                         case '_': newstate = 0; break;
315                                         }
316                                 change = newstate ^ st->devstate[i];
317                                 if (st->utime && change && !st->err) {
318                                         if (i < (unsigned)array.raid_disks &&
319                                             (((newstate&change)&(1<<MD_DISK_FAULTY)) ||
320                                              ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) ||
321                                              ((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
322                                                 )
323                                                 alert("Fail", dev, dv, mailaddr, alert_cmd);
324                                         else if (i >= (unsigned)array.raid_disks &&
325                                                  (disc.major || disc.minor) &&
326                                                  st->devid[i] == makedev(disc.major, disc.minor) &&
327                                                  ((newstate&change)&(1<<MD_DISK_FAULTY))
328                                                 )
329                                                 alert("FailSpare", dev, dv, mailaddr, alert_cmd);
330                                         else if (i < (unsigned)array.raid_disks &&
331                                                  (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) ||
332                                                   ((newstate&change)&(1<<MD_DISK_ACTIVE)) ||
333                                                   ((newstate&change)&(1<<MD_DISK_SYNC)))
334                                                 )
335                                                 alert("SpareActive", dev, dv, mailaddr, alert_cmd);
336                                 }
337                                 st->devstate[i] = disc.state;
338                                 st->devid[i] = makedev(disc.major, disc.minor);
339                         }
340                         close(fd);
341                         st->active = array.active_disks;
342                         st->working = array.working_disks;
343                         st->spare = array.spare_disks;
344                         st->failed = array.failed_disks;
345                         st->utime = array.utime;
346                         st->raid = array.raid_disks;
347                         st->err = 0;
348                 }
349                 /* now check if there are any new devices found in mdstat */
350                 if (scan) {
351                         struct mdstat_ent *mse;
352                         for (mse=mdstat; mse; mse=mse->next) 
353                                 if (mse->devnum != MAXINT &&
354                                     (strcmp(mse->level, "raid1")==0 ||
355                                      strcmp(mse->level, "raid5")==0 ||
356                                      strcmp(mse->level, "multipath")==0)
357                                         ) {
358                                         struct state *st = malloc(sizeof *st);
359                                         mdu_array_info_t array;
360                                         int fd;
361                                         if (st == NULL)
362                                                 continue;
363                                         st->devname = strdup(get_md_name(mse->devnum));
364                                         if ((fd = open(st->devname, O_RDONLY)) < 0 ||
365                                             ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
366                                                 /* no such array */
367                                                 if (fd >=0) close(fd);
368                                                 free(st->devname);
369                                                 free(st);
370                                                 continue;
371                                         }
372                                         close(fd);
373                                         st->utime = 0;
374                                         st->next = statelist;
375                                         st->err = 1;
376                                         st->devnum = mse->devnum;
377                                         st->percent = -2;
378                                         st->spare_group = NULL;
379                                         st->expected_spares = -1;
380                                         statelist = st;
381                                         alert("NewArray", st->devname, NULL, mailaddr, alert_cmd);
382                                         new_found = 1;
383                                 }
384                 }
385                 /* If an array has active < raid && spare == 0 && spare_group != NULL
386                  * Look for another array with spare > 0 and active == raid and same spare_group
387                  *  if found, choose a device and hotremove/hotadd
388                  */
389                 for (st = statelist; st; st=st->next)
390                         if (st->active < st->raid &&
391                             st->spare == 0 &&
392                             st->spare_group != NULL) {
393                                 struct state *st2;
394                                 for (st2=statelist ; st2 ; st2=st2->next)
395                                         if (st2 != st &&
396                                             st2->spare > 0 &&
397                                             st2->active == st2->raid &&
398                                             st2->spare_group != NULL &&
399                                             strcmp(st->spare_group, st2->spare_group) == 0) {
400                                                 /* try to remove and add */
401                                                 int fd1 = open(st->devname, O_RDONLY);
402                                                 int fd2 = open(st2->devname, O_RDONLY);
403                                                 int dev = -1;
404                                                 int d;
405                                                 if (fd1 < 0 || fd2 < 0) {
406                                                         if (fd1>=0) close(fd1);
407                                                         if (fd2>=0) close(fd2);
408                                                         continue;
409                                                 }
410                                                 for (d=st2->raid; d<MD_SB_DISKS; d++) {
411                                                         if (st2->devid[d] > 0 &&
412                                                             st2->devstate[d] == 0) {
413                                                                 dev = st2->devid[d];
414                                                                 break;
415                                                         }
416                                                 }
417                                                 if (dev > 0) {
418                                                         if (ioctl(fd2, HOT_REMOVE_DISK, 
419                                                                   (unsigned long)dev) == 0) {
420                                                                 if (ioctl(fd1, HOT_ADD_DISK,
421                                                                           (unsigned long)dev) == 0) {
422                                                                         alert("MoveSpare", st->devname, st2->devname, mailaddr, alert_cmd);
423                                                                         close(fd1);
424                                                                         close(fd2);
425                                                                         break;
426                                                                 }
427                                                                 else ioctl(fd2, HOT_ADD_DISK, (unsigned long) dev);
428                                                         }
429                                                 }
430                                                 close(fd1);
431                                                 close(fd2);
432                                         }
433                         }
434                 if (!new_found) {
435                         if (oneshot)
436                                 break;
437                         else
438                                 mdstat_wait(period);
439                 }
440                 test = 0;
441         }
442         if (pidfile)
443                 unlink(pidfile);
444         return 0;
445 }
446
447
448 static void alert(char *event, char *dev, char *disc, char *mailaddr, char *cmd)
449 {
450         if (!cmd && !mailaddr) {
451                 time_t now = time(0);
452                
453                 printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
454         }
455         if (cmd) {
456                 int pid = fork();
457                 switch(pid) {
458                 default:
459                         waitpid(pid, NULL, 0);
460                         break;
461                 case -1:
462                         break;
463                 case 0:
464                         execl(cmd, cmd, event, dev, disc, NULL);
465                         exit(2);
466                 }
467         }
468         if (mailaddr && 
469             (strncmp(event, "Fail", 4)==0 || 
470              strncmp(event, "Test", 4)==0 ||
471              strncmp(event, "Degrade", 7)==0)) {
472                 FILE *mp = popen(Sendmail, "w");
473                 if (mp) {
474                         char hname[256];
475                         gethostname(hname, sizeof(hname));
476                         signal(SIGPIPE, SIG_IGN);
477                         fprintf(mp, "From: " Name " monitoring <root>\n");
478                         fprintf(mp, "To: %s\n", mailaddr);
479                         fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);
480
481                         fprintf(mp, "This is an automatically generated mail message from " Name "\n");
482                         fprintf(mp, "running on %s\n\n", hname);
483
484                         fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);
485
486                         if (disc)
487                                 fprintf(mp, "It could be related to component device %s.\n\n", disc);
488
489                         fprintf(mp, "Faithfully yours, etc.\n");
490                         fclose(mp);
491                 }
492
493         }
494         /* FIXME log the event to syslog maybe */
495 }