Monitor.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
   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@suse.de>
  23  */
  24
  25 #include        "mdadm.h"
  26 #include        "md_p.h"
  27 #include        "md_u.h"
  28 #include        <sys/wait.h>
  29 #include        <signal.h>
  30 #include        <limits.h>
  31 #include        <syslog.h>
  32
  33 static void alert(char *event, char *dev, char *disc, char *mailaddr, char *mailfrom,
  34                   char *cmd, int dosyslog);
  35
  36 /* The largest number of disks current arrays can manage is 384
  37  * This really should be dynamically, but that will have to wait
  38  * At least it isn't MD_SB_DISKS.
  39  */
  40 #define MaxDisks 384
  41 int Monitor(mddev_dev_t devlist,
  42             char *mailaddr, char *alert_cmd,
  43             int period, int daemonise, int scan, int oneshot,
  44             int dosyslog, int test, char* pidfile, int increments)
  45 {
  46         /*
  47          * Every few seconds, scan every md device looking for changes
  48          * When a change is found, log it, possibly run the alert command,
  49          * and possibly send Email
  50          *
  51          * For each array, we record:
  52          *   Update time
  53          *   active/working/failed/spare drives
  54          *   State of each device.
  55          *   %rebuilt if rebuilding
  56          *
  57          * If the update time changes, check out all the data again
  58          * It is possible that we cannot get the state of each device
  59          * due to bugs in the md kernel module.
  60          * We also read /proc/mdstat to get rebuild percent,
  61          * and to get state on all active devices incase of kernel bug.
  62          *
  63          * Events are:
  64          *    Fail
  65          *      An active device had Faulty set or Active/Sync removed
  66          *    FailSpare
  67          *      A spare device had Faulty set
  68          *    SpareActive
  69          *      An active device had a reverse transition
  70          *    RebuildStarted
  71          *      percent went from -1 to +ve
  72          *    RebuildNN
  73          *      percent went from below to not-below NN%
  74          *    DeviceDisappeared
  75          *      Couldn't access a device which was previously visible
  76          *
  77          * if we detect an array with active<raid and spare==0
  78          * we look at other arrays that have same spare-group
  79          * If we find one with active==raid and spare>0,
  80          *  and if we can get_disk_info and find a name
  81          *  Then we hot-remove and hot-add to the other array
  82          *
  83          * If devlist is NULL, then we can monitor everything because --scan
  84          * was given.  We get an initial list from config file and add anything
  85          * that appears in /proc/mdstat
  86          */
  87
  88         struct state {
  89                 char *devname;
  90                 int devnum;     /* to sync with mdstat info */
  91                 long utime;
  92                 int err;
  93                 char *spare_group;
  94                 int active, working, failed, spare, raid;
  95                 int expected_spares;
  96                 int devstate[MaxDisks];
  97                 int devid[MaxDisks];
  98                 int percent;
  99                 struct state *next;
 100         } *statelist = NULL;
 101         int finished = 0;
 102         struct mdstat_ent *mdstat = NULL;
 103         char *mailfrom = NULL;
 104
 105         if (!mailaddr) {
 106                 mailaddr = conf_get_mailaddr();
 107                 if (mailaddr && ! scan)
 108                         fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
 109                                mailaddr);
 110         }
 111         mailfrom = conf_get_mailfrom();
 112
 113         if (!alert_cmd) {
 114                 alert_cmd = conf_get_program();
 115                 if (alert_cmd && ! scan)
 116                         fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
 117                                alert_cmd);
 118         }
 119         if (scan && !mailaddr && !alert_cmd) {
 120                 fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
 121                 return 1;
 122         }
 123
 124         if (daemonise) {
 125                 int pid = fork();
 126                 if (pid > 0) {
 127                         if (!pidfile)
 128                                 printf("%d\n", pid);
 129                         else {
 130                                 FILE *pid_file;
 131                                 pid_file=fopen(pidfile, "w");
 132                                 if (!pid_file)
 133                                         perror("cannot create pid file");
 134                                 else {
 135                                         fprintf(pid_file,"%d\n", pid);
 136                                         fclose(pid_file);
 137                                 }
 138                         }
 139                         return 0;
 140                 }
 141                 if (pid < 0) {
 142                         perror("daemonise");
 143                         return 1;
 144                 }
 145                 close(0);
 146                 open("/dev/null", O_RDWR);
 147                 dup2(0,1);
 148                 dup2(0,2);
 149                 setsid();
 150         }
 151
 152         if (devlist == NULL) {
 153                 mddev_ident_t mdlist = conf_get_ident(NULL);
 154                 for (; mdlist; mdlist=mdlist->next) {
 155                         struct state *st;
 156                         if (mdlist->devname == NULL)
 157                                 continue;
 158                         if (strcasecmp(mdlist->devname, "<ignore>") == 0)
 159                                 continue;
 160                         st = malloc(sizeof *st);
 161                         if (st == NULL)
 162                                 continue;
 163                         if (mdlist->devname[0] == '/')
 164                                 st->devname = strdup(mdlist->devname);
 165                         else {
 166                                 st->devname = malloc(8+strlen(mdlist->devname)+1);
 167                                 strcpy(strcpy(st->devname, "/dev/md/"),
 168                                        mdlist->devname);
 169                         }
 170                         st->utime = 0;
 171                         st->next = statelist;
 172                         st->err = 0;
 173                         st->devnum = INT_MAX;
 174                         st->percent = -2;
 175                         st->expected_spares = mdlist->spare_disks;
 176                         if (mdlist->spare_group)
 177                                 st->spare_group = strdup(mdlist->spare_group);
 178                         else
 179                                 st->spare_group = NULL;
 180                         statelist = st;
 181                 }
 182         } else {
 183                 mddev_dev_t dv;
 184                 for (dv=devlist ; dv; dv=dv->next) {
 185                         mddev_ident_t mdlist = conf_get_ident(dv->devname);
 186                         struct state *st = malloc(sizeof *st);
 187                         if (st == NULL)
 188                                 continue;
 189                         st->devname = strdup(dv->devname);
 190                         st->utime = 0;
 191                         st->next = statelist;
 192                         st->err = 0;
 193                         st->devnum = INT_MAX;
 194                         st->percent = -2;
 195                         st->expected_spares = -1;
 196                         st->spare_group = NULL;
 197                         if (mdlist) {
 198                                 st->expected_spares = mdlist->spare_disks;
 199                                 if (mdlist->spare_group)
 200                                         st->spare_group = strdup(mdlist->spare_group);
 201                         }
 202                         statelist = st;
 203                 }
 204         }
 205
 206
 207         while (! finished) {
 208                 int new_found = 0;
 209                 struct state *st;
 210
 211                 if (mdstat)
 212                         free_mdstat(mdstat);
 213                 mdstat = mdstat_read(oneshot?0:1, 0);
 214
 215                 for (st=statelist; st; st=st->next) {
 216                         struct { int state, major, minor; } info[MaxDisks];
 217                         mdu_array_info_t array;
 218                         struct mdstat_ent *mse = NULL, *mse2;
 219                         char *dev = st->devname;
 220                         int fd;
 221                         unsigned int i;
 222
 223                         if (test)
 224                                 alert("TestMessage", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 225                         fd = open(dev, O_RDONLY);
 226                         if (fd < 0) {
 227                                 if (!st->err)
 228                                         alert("DeviceDisappeared", dev, NULL,
 229                                               mailaddr, mailfrom, alert_cmd, dosyslog);
 230 /*                                      fprintf(stderr, Name ": cannot open %s: %s\n",
 231                                                 dev, strerror(errno));
 232 */                              st->err=1;
 233                                 continue;
 234                         }
 235                         fcntl(fd, F_SETFD, FD_CLOEXEC);
 236                         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
 237                                 if (!st->err)
 238                                         alert("DeviceDisappeared", dev, NULL,
 239                                               mailaddr, mailfrom, alert_cmd, dosyslog);
 240 /*                                      fprintf(stderr, Name ": cannot get array info for %s: %s\n",
 241                                                 dev, strerror(errno));
 242 */                              st->err=1;
 243                                 close(fd);
 244                                 continue;
 245                         }
 246                         /* It's much easier to list what array levels can't
 247                          * have a device disappear than all of them that can
 248                          */
 249                         if (array.level == 0 || array.level == -1) {
 250                                 if (!st->err)
 251                                         alert("DeviceDisappeared", dev, "Wrong-Level",
 252                                               mailaddr, mailfrom, alert_cmd, dosyslog);
 253                                 st->err = 1;
 254                                 close(fd);
 255                                 continue;
 256                         }
 257                         if (st->devnum == INT_MAX) {
 258                                 struct stat stb;
 259                                 if (fstat(fd, &stb) == 0 &&
 260                                     (S_IFMT&stb.st_mode)==S_IFBLK) {
 261                                         if (major(stb.st_rdev) == MD_MAJOR)
 262                                                 st->devnum = minor(stb.st_rdev);
 263                                         else
 264                                                 st->devnum = -1- (minor(stb.st_rdev)>>6);
 265                                 }
 266                         }
 267
 268                         for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
 269                                 if (mse2->devnum == st->devnum) {
 270                                         mse2->devnum = INT_MAX; /* flag it as "used" */
 271                                         mse = mse2;
 272                                 }
 273
 274                         if (array.utime == 0)
 275                                 /* external arrays don't update utime */
 276                                 array.utime = time(0);
 277
 278                         if (st->utime == array.utime &&
 279                             st->failed == array.failed_disks &&
 280                             st->working == array.working_disks &&
 281                             st->spare == array.spare_disks &&
 282                             (mse == NULL  || (
 283                                     mse->percent == st->percent
 284                                     ))) {
 285                                 close(fd);
 286                                 st->err = 0;
 287                                 continue;
 288                         }
 289                         if (st->utime == 0 && /* new array */
 290                             mse &&      /* is in /proc/mdstat */
 291                             mse->pattern && strchr(mse->pattern, '_') /* degraded */
 292                                 )
 293                                 alert("DegradedArray", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 294
 295                         if (st->utime == 0 && /* new array */
 296                             st->expected_spares > 0 &&
 297                             array.spare_disks < st->expected_spares)
 298                                 alert("SparesMissing", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 299                         if (mse &&
 300                             st->percent == -1 &&
 301                             mse->percent >= 0)
 302                                 alert("RebuildStarted", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 303                         if (mse &&
 304                             st->percent >= 0 &&
 305                             mse->percent >= 0 &&
 306                             (mse->percent / increments) > (st->percent / increments)) {
 307                                 char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
 308
 309                                 if((mse->percent / increments) == 0)
 310                                         snprintf(percentalert, sizeof(percentalert), "RebuildStarted");
 311                                 else
 312                                         snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent);
 313
 314                                 alert(percentalert,
 315                                       dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 316                         }
 317
 318                         if (mse &&
 319                             mse->percent == -1 &&
 320                             st->percent >= 0) {
 321                                 /* Rebuild/sync/whatever just finished.
 322                                  * If there is a number in /mismatch_cnt,
 323                                  * we should report that.
 324                                  */
 325                                 struct mdinfo *sra =
 326                                        sysfs_read(-1, st->devnum, GET_MISMATCH);
 327                                 if (sra && sra->mismatch_cnt > 0) {
 328                                         char cnt[40];
 329                                         sprintf(cnt, " mismatches found: %d", sra->mismatch_cnt);
 330                                         alert("RebuildFinished", dev, cnt, mailaddr, mailfrom, alert_cmd, dosyslog);
 331                                 } else
 332                                         alert("RebuildFinished", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 333                                 if (sra)
 334                                         free(sra);
 335                         }
 336
 337                         if (mse)
 338                                 st->percent = mse->percent;
 339
 340
 341                         for (i=0; i<MaxDisks && i <= array.raid_disks + array.nr_disks;
 342                              i++) {
 343                                 mdu_disk_info_t disc;
 344                                 disc.number = i;
 345                                 if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) {
 346                                         info[i].state = disc.state;
 347                                         info[i].major = disc.major;
 348                                         info[i].minor = disc.minor;
 349                                 } else
 350                                         info[i].major = info[i].minor = 0;
 351                         }
 352                         close(fd);
 353
 354                         for (i=0; i<MaxDisks; i++) {
 355                                 mdu_disk_info_t disc = {0};
 356                                 int newstate=0;
 357                                 int change;
 358                                 char *dv = NULL;
 359                                 disc.number = i;
 360                                 if (i > array.raid_disks + array.nr_disks) {
 361                                         newstate = 0;
 362                                         disc.major = disc.minor = 0;
 363                                 } else if (info[i].major || info[i].minor) {
 364                                         newstate = info[i].state;
 365                                         dv = map_dev(info[i].major, info[i].minor, 1);
 366                                         disc.state = newstate;
 367                                         disc.major = info[i].major;
 368                                         disc.minor = info[i].minor;
 369                                 } else if (mse &&  mse->pattern && i < strlen(mse->pattern)) {
 370                                         switch(mse->pattern[i]) {
 371                                         case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
 372                                         case '_': newstate = 0; break;
 373                                         }
 374                                         disc.major = disc.minor = 0;
 375                                 }
 376                                 if (dv == NULL && st->devid[i])
 377                                         dv = map_dev(major(st->devid[i]),
 378                                                      minor(st->devid[i]), 1);
 379                                 change = newstate ^ st->devstate[i];
 380                                 if (st->utime && change && !st->err) {
 381                                         if (i < (unsigned)array.raid_disks &&
 382                                             (((newstate&change)&(1<<MD_DISK_FAULTY)) ||
 383                                              ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) ||
 384                                              ((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
 385                                                 )
 386                                                 alert("Fail", dev, dv, mailaddr, mailfrom, alert_cmd, dosyslog);
 387                                         else if (i >= (unsigned)array.raid_disks &&
 388                                                  (disc.major || disc.minor) &&
 389                                                  st->devid[i] == makedev(disc.major, disc.minor) &&
 390                                                  ((newstate&change)&(1<<MD_DISK_FAULTY))
 391                                                 )
 392                                                 alert("FailSpare", dev, dv, mailaddr, mailfrom, alert_cmd, dosyslog);
 393                                         else if (i < (unsigned)array.raid_disks &&
 394                                                  (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) ||
 395                                                   ((newstate&change)&(1<<MD_DISK_ACTIVE)) ||
 396                                                   ((newstate&change)&(1<<MD_DISK_SYNC)))
 397                                                 )
 398                                                 alert("SpareActive", dev, dv, mailaddr, mailfrom, alert_cmd, dosyslog);
 399                                 }
 400                                 st->devstate[i] = newstate;
 401                                 st->devid[i] = makedev(disc.major, disc.minor);
 402                         }
 403                         st->active = array.active_disks;
 404                         st->working = array.working_disks;
 405                         st->spare = array.spare_disks;
 406                         st->failed = array.failed_disks;
 407                         st->utime = array.utime;
 408                         st->raid = array.raid_disks;
 409                         st->err = 0;
 410                 }
 411                 /* now check if there are any new devices found in mdstat */
 412                 if (scan) {
 413                         struct mdstat_ent *mse;
 414                         for (mse=mdstat; mse; mse=mse->next)
 415                                 if (mse->devnum != INT_MAX &&
 416                                     mse->level &&
 417                                     (strcmp(mse->level, "raid0")!=0 &&
 418                                      strcmp(mse->level, "linear")!=0)
 419                                         ) {
 420                                         struct state *st = malloc(sizeof *st);
 421                                         mdu_array_info_t array;
 422                                         int fd;
 423                                         if (st == NULL)
 424                                                 continue;
 425                                         st->devname = strdup(get_md_name(mse->devnum));
 426                                         if ((fd = open(st->devname, O_RDONLY)) < 0 ||
 427                                             ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
 428                                                 /* no such array */
 429                                                 if (fd >=0) close(fd);
 430                                                 put_md_name(st->devname);
 431                                                 free(st->devname);
 432                                                 free(st);
 433                                                 continue;
 434                                         }
 435                                         close(fd);
 436                                         st->utime = 0;
 437                                         st->next = statelist;
 438                                         st->err = 1;
 439                                         st->devnum = mse->devnum;
 440                                         st->percent = -2;
 441                                         st->spare_group = NULL;
 442                                         st->expected_spares = -1;
 443                                         statelist = st;
 444                                         if (test)
 445                                                 alert("TestMessage", st->devname, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 446                                         alert("NewArray", st->devname, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 447                                         new_found = 1;
 448                                 }
 449                 }
 450                 /* If an array has active < raid && spare == 0 && spare_group != NULL
 451                  * Look for another array with spare > 0 and active == raid and same spare_group
 452                  *  if found, choose a device and hotremove/hotadd
 453                  */
 454                 for (st = statelist; st; st=st->next)
 455                         if (st->active < st->raid &&
 456                             st->spare == 0 &&
 457                             st->spare_group != NULL) {
 458                                 struct state *st2;
 459                                 for (st2=statelist ; st2 ; st2=st2->next)
 460                                         if (st2 != st &&
 461                                             st2->spare > 0 &&
 462                                             st2->active == st2->raid &&
 463                                             st2->spare_group != NULL &&
 464                                             strcmp(st->spare_group, st2->spare_group) == 0) {
 465                                                 /* try to remove and add */
 466                                                 int fd1 = open(st->devname, O_RDONLY);
 467                                                 int fd2 = open(st2->devname, O_RDONLY);
 468                                                 int dev = -1;
 469                                                 int d;
 470                                                 if (fd1 < 0 || fd2 < 0) {
 471                                                         if (fd1>=0) close(fd1);
 472                                                         if (fd2>=0) close(fd2);
 473                                                         continue;
 474                                                 }
 475                                                 for (d=st2->raid; d < MaxDisks; d++) {
 476                                                         if (st2->devid[d] > 0 &&
 477                                                             st2->devstate[d] == 0) {
 478                                                                 dev = st2->devid[d];
 479                                                                 break;
 480                                                         }
 481                                                 }
 482                                                 if (dev > 0) {
 483                                                         struct mddev_dev_s devlist;
 484                                                         char devname[20];
 485                                                         devlist.next = NULL;
 486                                                         devlist.used = 0;
 487                                                         devlist.re_add = 0;
 488                                                         devlist.writemostly = 0;
 489                                                         devlist.devname = devname;
 490                                                         sprintf(devname, "%d:%d", major(dev), minor(dev));
 491
 492                                                         devlist.disposition = 'r';
 493                                                         if (Manage_subdevs(st2->devname, fd2, &devlist, -1) == 0) {
 494                                                                 devlist.disposition = 'a';
 495                                                                 if (Manage_subdevs(st->devname, fd1, &devlist, -1) == 0) {
 496                                                                         alert("MoveSpare", st->devname, st2->devname, mailaddr, mailfrom, alert_cmd, dosyslog);
 497                                                                         close(fd1);
 498                                                                         close(fd2);
 499                                                                         break;
 500                                                                 }
 501                                                                 else Manage_subdevs(st2->devname, fd2, &devlist, -1);
 502                                                         }
 503                                                 }
 504                                                 close(fd1);
 505                                                 close(fd2);
 506                                         }
 507                         }
 508                 if (!new_found) {
 509                         if (oneshot)
 510                                 break;
 511                         else
 512                                 mdstat_wait(period);
 513                 }
 514                 test = 0;
 515         }
 516         if (pidfile)
 517                 unlink(pidfile);
 518         return 0;
 519 }
 520
 521
 522 static void alert(char *event, char *dev, char *disc, char *mailaddr, char *mailfrom, char *cmd,
 523                   int dosyslog)
 524 {
 525         int priority;
 526
 527         if (!cmd && !mailaddr) {
 528                 time_t now = time(0);
 529
 530                 printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
 531         }
 532         if (cmd) {
 533                 int pid = fork();
 534                 switch(pid) {
 535                 default:
 536                         waitpid(pid, NULL, 0);
 537                         break;
 538                 case -1:
 539                         break;
 540                 case 0:
 541                         execl(cmd, cmd, event, dev, disc, NULL);
 542                         exit(2);
 543                 }
 544         }
 545         if (mailaddr &&
 546             (strncmp(event, "Fail", 4)==0 ||
 547              strncmp(event, "Test", 4)==0 ||
 548              strncmp(event, "Spares", 6)==0 ||
 549              strncmp(event, "Degrade", 7)==0)) {
 550                 FILE *mp = popen(Sendmail, "w");
 551                 if (mp) {
 552                         FILE *mdstat;
 553                         char hname[256];
 554                         gethostname(hname, sizeof(hname));
 555                         signal(SIGPIPE, SIG_IGN);
 556                         if (mailfrom)
 557                                 fprintf(mp, "From: %s\n", mailfrom);
 558                         else
 559                                 fprintf(mp, "From: " Name " monitoring <root>\n");
 560                         fprintf(mp, "To: %s\n", mailaddr);
 561                         fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);
 562
 563                         fprintf(mp, "This is an automatically generated mail message from " Name "\n");
 564                         fprintf(mp, "running on %s\n\n", hname);
 565
 566                         fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);
 567
 568                         if (disc && disc[0] != ' ')
 569                                 fprintf(mp, "It could be related to component device %s.\n\n", disc);
 570                         if (disc && disc[0] == ' ')
 571                                 fprintf(mp, "Extra information:%s.\n\n", disc);
 572
 573                         fprintf(mp, "Faithfully yours, etc.\n");
 574
 575                         mdstat = fopen("/proc/mdstat", "r");
 576                         if (mdstat) {
 577                                 char buf[8192];
 578                                 int n;
 579                                 fprintf(mp, "\nP.S. The /proc/mdstat file currently contains the following:\n\n");
 580                                 while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0)
 581                                         n=fwrite(buf, 1, n, mp); /* yes, i don't care about the result */
 582                                 fclose(mdstat);
 583                         }
 584                         pclose(mp);
 585                 }
 586
 587         }
 588
 589         /* log the event to syslog maybe */
 590         if (dosyslog) {
 591                 /* Log at a different severity depending on the event.
 592                  *
 593                  * These are the critical events:  */
 594                 if (strncmp(event, "Fail", 4)==0 ||
 595                     strncmp(event, "Degrade", 7)==0 ||
 596                     strncmp(event, "DeviceDisappeared", 17)==0)
 597                         priority = LOG_CRIT;
 598                 /* Good to know about, but are not failures: */
 599                 else if (strncmp(event, "Rebuild", 7)==0 ||
 600                          strncmp(event, "MoveSpare", 9)==0 ||
 601                          strncmp(event, "Spares", 6) != 0)
 602                         priority = LOG_WARNING;
 603                 /* Everything else: */
 604                 else
 605                         priority = LOG_INFO;
 606
 607                 if (disc)
 608                         syslog(priority, "%s event detected on md device %s, component device %s", event, dev, disc);
 609                 else
 610                         syslog(priority, "%s event detected on md device %s", event, dev);
 611         }
 612 }
 613
 614 /* Not really Monitor but ... */
 615 int Wait(char *dev)
 616 {
 617         struct stat stb;
 618         int devnum;
 619         int rv = 1;
 620
 621         if (stat(dev, &stb) != 0) {
 622                 fprintf(stderr, Name ": Cannot find %s: %s\n", dev,
 623                         strerror(errno));
 624                 return 2;
 625         }
 626         devnum = stat2devnum(&stb);
 627
 628         while(1) {
 629                 struct mdstat_ent *ms = mdstat_read(1, 0);
 630                 struct mdstat_ent *e;
 631
 632                 for (e=ms ; e; e=e->next)
 633                         if (e->devnum == devnum)
 634                                 break;
 635
 636                 if (!e || e->percent < 0) {
 637                         if (e && e->metadata_version &&
 638                             strncmp(e->metadata_version, "external:", 9) == 0) {
 639                                 if (is_subarray(&e->metadata_version[9]))
 640                                         ping_monitor(&e->metadata_version[9]);
 641                                 else
 642                                         ping_monitor(devnum2devname(devnum));
 643                         }
 644                         free_mdstat(ms);
 645                         return rv;
 646                 }
 647                 free_mdstat(ms);
 648                 rv = 0;
 649                 mdstat_wait(5);
 650         }
 651 }