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(struct mddev_dev *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             int share)
  46 {
  47         /*
  48          * Every few seconds, scan every md device looking for changes
  49          * When a change is found, log it, possibly run the alert command,
  50          * and possibly send Email
  51          *
  52          * For each array, we record:
  53          *   Update time
  54          *   active/working/failed/spare drives
  55          *   State of each device.
  56          *   %rebuilt if rebuilding
  57          *
  58          * If the update time changes, check out all the data again
  59          * It is possible that we cannot get the state of each device
  60          * due to bugs in the md kernel module.
  61          * We also read /proc/mdstat to get rebuild percent,
  62          * and to get state on all active devices incase of kernel bug.
  63          *
  64          * Events are:
  65          *    Fail
  66          *      An active device had Faulty set or Active/Sync removed
  67          *    FailSpare
  68          *      A spare device had Faulty set
  69          *    SpareActive
  70          *      An active device had a reverse transition
  71          *    RebuildStarted
  72          *      percent went from -1 to +ve
  73          *    RebuildNN
  74          *      percent went from below to not-below NN%
  75          *    DeviceDisappeared
  76          *      Couldn't access a device which was previously visible
  77          *
  78          * if we detect an array with active<raid and spare==0
  79          * we look at other arrays that have same spare-group
  80          * If we find one with active==raid and spare>0,
  81          *  and if we can get_disk_info and find a name
  82          *  Then we hot-remove and hot-add to the other array
  83          *
  84          * If devlist is NULL, then we can monitor everything because --scan
  85          * was given.  We get an initial list from config file and add anything
  86          * that appears in /proc/mdstat
  87          */
  88
  89         struct state {
  90                 char *devname;
  91                 int devnum;     /* to sync with mdstat info */
  92                 long utime;
  93                 int err;
  94                 char *spare_group;
  95                 int active, working, failed, spare, raid;
  96                 int expected_spares;
  97                 int devstate[MaxDisks];
  98                 unsigned devid[MaxDisks];
  99                 int percent;
 100                 struct state *next;
 101         } *statelist = NULL;
 102         int finished = 0;
 103         struct mdstat_ent *mdstat = NULL;
 104         char *mailfrom = NULL;
 105
 106         if (!mailaddr) {
 107                 mailaddr = conf_get_mailaddr();
 108                 if (mailaddr && ! scan)
 109                         fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
 110                                mailaddr);
 111         }
 112         mailfrom = conf_get_mailfrom();
 113
 114         if (!alert_cmd) {
 115                 alert_cmd = conf_get_program();
 116                 if (alert_cmd && ! scan)
 117                         fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
 118                                alert_cmd);
 119         }
 120         if (scan && !mailaddr && !alert_cmd) {
 121                 fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
 122                 return 1;
 123         }
 124
 125         if (daemonise) {
 126                 int pid = fork();
 127                 if (pid > 0) {
 128                         if (!pidfile)
 129                                 printf("%d\n", pid);
 130                         else {
 131                                 FILE *pid_file;
 132                                 pid_file=fopen(pidfile, "w");
 133                                 if (!pid_file)
 134                                         perror("cannot create pid file");
 135                                 else {
 136                                         fprintf(pid_file,"%d\n", pid);
 137                                         fclose(pid_file);
 138                                 }
 139                         }
 140                         return 0;
 141                 }
 142                 if (pid < 0) {
 143                         perror("daemonise");
 144                         return 1;
 145                 }
 146                 close(0);
 147                 open("/dev/null", O_RDWR);
 148                 dup2(0,1);
 149                 dup2(0,2);
 150                 setsid();
 151         }
 152
 153         if (share) {
 154                 int pid, rv;
 155                 FILE *fp;
 156                 char dir[20];
 157                 struct stat buf;
 158                 fp = fopen("/var/run/mdadm/autorebuild.pid", "r");
 159                 if (fp) {
 160                         fscanf(fp, "%d", &pid);
 161                         sprintf(dir, "/proc/%d", pid);
 162                         rv = stat(dir, &buf);
 163                         if (rv != -1) {
 164                                 if (scan) {
 165                                         fprintf(stderr, Name ": Only one "
 166                                                 "autorebuild process allowed"
 167                                                 " in scan mode, aborting\n");
 168                                         fclose(fp);
 169                                         return 1;
 170                                 } else {
 171                                         fprintf(stderr, Name ": Warning: One"
 172                                                 " autorebuild process already"
 173                                                 " running.");
 174                                 }
 175                         }
 176                         fclose(fp);
 177                 }
 178                 if (scan) {
 179                         fp = fopen("/var/run/mdadm/autorebuild.pid", "w");
 180                         if (!fp)
 181                                 fprintf(stderr, Name ": Cannot create"
 182                                         " autorebuild.pid "
 183                                         "file\n");
 184                         else {
 185                                 pid = getpid();
 186                                 fprintf(fp, "%d\n", pid);
 187                                 fclose(fp);
 188                         }
 189                 }
 190         }
 191
 192         if (devlist == NULL) {
 193                 struct mddev_ident *mdlist = conf_get_ident(NULL);
 194                 for (; mdlist; mdlist=mdlist->next) {
 195                         struct state *st;
 196                         if (mdlist->devname == NULL)
 197                                 continue;
 198                         if (strcasecmp(mdlist->devname, "<ignore>") == 0)
 199                                 continue;
 200                         st = malloc(sizeof *st);
 201                         if (st == NULL)
 202                                 continue;
 203                         if (mdlist->devname[0] == '/')
 204                                 st->devname = strdup(mdlist->devname);
 205                         else {
 206                                 st->devname = malloc(8+strlen(mdlist->devname)+1);
 207                                 strcpy(strcpy(st->devname, "/dev/md/"),
 208                                        mdlist->devname);
 209                         }
 210                         st->utime = 0;
 211                         st->next = statelist;
 212                         st->err = 0;
 213                         st->devnum = INT_MAX;
 214                         st->percent = -2;
 215                         st->expected_spares = mdlist->spare_disks;
 216                         if (mdlist->spare_group)
 217                                 st->spare_group = strdup(mdlist->spare_group);
 218                         else
 219                                 st->spare_group = NULL;
 220                         statelist = st;
 221                 }
 222         } else {
 223                 struct mddev_dev *dv;
 224                 for (dv=devlist ; dv; dv=dv->next) {
 225                         struct mddev_ident *mdlist = conf_get_ident(dv->devname);
 226                         struct state *st = malloc(sizeof *st);
 227                         if (st == NULL)
 228                                 continue;
 229                         st->devname = strdup(dv->devname);
 230                         st->utime = 0;
 231                         st->next = statelist;
 232                         st->err = 0;
 233                         st->devnum = INT_MAX;
 234                         st->percent = -2;
 235                         st->expected_spares = -1;
 236                         st->spare_group = NULL;
 237                         if (mdlist) {
 238                                 st->expected_spares = mdlist->spare_disks;
 239                                 if (mdlist->spare_group)
 240                                         st->spare_group = strdup(mdlist->spare_group);
 241                         }
 242                         statelist = st;
 243                 }
 244         }
 245
 246
 247         while (! finished) {
 248                 int new_found = 0;
 249                 struct state *st;
 250
 251                 if (mdstat)
 252                         free_mdstat(mdstat);
 253                 mdstat = mdstat_read(oneshot?0:1, 0);
 254
 255                 for (st=statelist; st; st=st->next) {
 256                         struct { int state, major, minor; } info[MaxDisks];
 257                         mdu_array_info_t array;
 258                         struct mdstat_ent *mse = NULL, *mse2;
 259                         char *dev = st->devname;
 260                         int fd;
 261                         int i;
 262
 263                         if (test)
 264                                 alert("TestMessage", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 265                         fd = open(dev, O_RDONLY);
 266                         if (fd < 0) {
 267                                 if (!st->err)
 268                                         alert("DeviceDisappeared", dev, NULL,
 269                                               mailaddr, mailfrom, alert_cmd, dosyslog);
 270 /*                                      fprintf(stderr, Name ": cannot open %s: %s\n",
 271                                                 dev, strerror(errno));
 272 */                              st->err=1;
 273                                 continue;
 274                         }
 275                         fcntl(fd, F_SETFD, FD_CLOEXEC);
 276                         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
 277                                 if (!st->err)
 278                                         alert("DeviceDisappeared", dev, NULL,
 279                                               mailaddr, mailfrom, alert_cmd, dosyslog);
 280 /*                                      fprintf(stderr, Name ": cannot get array info for %s: %s\n",
 281                                                 dev, strerror(errno));
 282 */                              st->err=1;
 283                                 close(fd);
 284                                 continue;
 285                         }
 286                         /* It's much easier to list what array levels can't
 287                          * have a device disappear than all of them that can
 288                          */
 289                         if (array.level == 0 || array.level == -1) {
 290                                 if (!st->err)
 291                                         alert("DeviceDisappeared", dev, "Wrong-Level",
 292                                               mailaddr, mailfrom, alert_cmd, dosyslog);
 293                                 st->err = 1;
 294                                 close(fd);
 295                                 continue;
 296                         }
 297                         if (st->devnum == INT_MAX) {
 298                                 struct stat stb;
 299                                 if (fstat(fd, &stb) == 0 &&
 300                                     (S_IFMT&stb.st_mode)==S_IFBLK) {
 301                                         if (major(stb.st_rdev) == MD_MAJOR)
 302                                                 st->devnum = minor(stb.st_rdev);
 303                                         else
 304                                                 st->devnum = -1- (minor(stb.st_rdev)>>6);
 305                                 }
 306                         }
 307
 308                         for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
 309                                 if (mse2->devnum == st->devnum) {
 310                                         mse2->devnum = INT_MAX; /* flag it as "used" */
 311                                         mse = mse2;
 312                                 }
 313
 314                         if (!mse) {
 315                                 /* duplicated array in statelist
 316                                  * or re-created after reading mdstat*/
 317                                 st->err = 1;
 318                                 close(fd);
 319                                 continue;
 320                         }
 321                         /* this array is in /proc/mdstat */
 322                         if (array.utime == 0)
 323                                 /* external arrays don't update utime, so
 324                                  * just make sure it is always different. */
 325                                 array.utime = st->utime + 1;;
 326
 327                         if (st->utime == array.utime &&
 328                             st->failed == array.failed_disks &&
 329                             st->working == array.working_disks &&
 330                             st->spare == array.spare_disks &&
 331                             (mse == NULL  || (
 332                                     mse->percent == st->percent
 333                                     ))) {
 334                                 close(fd);
 335                                 st->err = 0;
 336                                 continue;
 337                         }
 338                         if (st->utime == 0 && /* new array */
 339                             mse->pattern && strchr(mse->pattern, '_') /* degraded */
 340                                 )
 341                                 alert("DegradedArray", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 342
 343                         if (st->utime == 0 && /* new array */
 344                             st->expected_spares > 0 &&
 345                             array.spare_disks < st->expected_spares)
 346                                 alert("SparesMissing", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 347                         if (st->percent == -1 &&
 348                             mse->percent >= 0)
 349                                 alert("RebuildStarted", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 350                         if (st->percent >= 0 &&
 351                             mse->percent >= 0 &&
 352                             (mse->percent / increments) > (st->percent / increments)) {
 353                                 char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
 354
 355                                 if((mse->percent / increments) == 0)
 356                                         snprintf(percentalert, sizeof(percentalert), "RebuildStarted");
 357                                 else
 358                                         snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent);
 359
 360                                 alert(percentalert,
 361                                       dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 362                         }
 363
 364                         if (mse->percent == -1 &&
 365                             st->percent >= 0) {
 366                                 /* Rebuild/sync/whatever just finished.
 367                                  * If there is a number in /mismatch_cnt,
 368                                  * we should report that.
 369                                  */
 370                                 struct mdinfo *sra =
 371                                        sysfs_read(-1, st->devnum, GET_MISMATCH);
 372                                 if (sra && sra->mismatch_cnt > 0) {
 373                                         char cnt[40];
 374                                         sprintf(cnt, " mismatches found: %d", sra->mismatch_cnt);
 375                                         alert("RebuildFinished", dev, cnt, mailaddr, mailfrom, alert_cmd, dosyslog);
 376                                 } else
 377                                         alert("RebuildFinished", dev, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 378                                 if (sra)
 379                                         free(sra);
 380                         }
 381                         st->percent = mse->percent;
 382
 383                         for (i=0; i<MaxDisks && i <= array.raid_disks + array.nr_disks;
 384                              i++) {
 385                                 mdu_disk_info_t disc;
 386                                 disc.number = i;
 387                                 if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) {
 388                                         info[i].state = disc.state;
 389                                         info[i].major = disc.major;
 390                                         info[i].minor = disc.minor;
 391                                 } else
 392                                         info[i].major = info[i].minor = 0;
 393                         }
 394                         close(fd);
 395
 396                         for (i=0; i<MaxDisks; i++) {
 397                                 mdu_disk_info_t disc = {0,0,0,0,0};
 398                                 int newstate=0;
 399                                 int change;
 400                                 char *dv = NULL;
 401                                 disc.number = i;
 402                                 if (i > array.raid_disks + array.nr_disks) {
 403                                         newstate = 0;
 404                                         disc.major = disc.minor = 0;
 405                                 } else if (info[i].major || info[i].minor) {
 406                                         newstate = info[i].state;
 407                                         dv = map_dev(info[i].major, info[i].minor, 1);
 408                                         disc.state = newstate;
 409                                         disc.major = info[i].major;
 410                                         disc.minor = info[i].minor;
 411                                 } else if (mse &&  mse->pattern && i < (int)strlen(mse->pattern)) {
 412                                         switch(mse->pattern[i]) {
 413                                         case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
 414                                         case '_': newstate = 0; break;
 415                                         }
 416                                         disc.major = disc.minor = 0;
 417                                 }
 418                                 if (dv == NULL && st->devid[i])
 419                                         dv = map_dev(major(st->devid[i]),
 420                                                      minor(st->devid[i]), 1);
 421                                 change = newstate ^ st->devstate[i];
 422                                 if (st->utime && change && !st->err) {
 423                                         if (i < array.raid_disks &&
 424                                             (((newstate&change)&(1<<MD_DISK_FAULTY)) ||
 425                                              ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) ||
 426                                              ((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
 427                                                 )
 428                                                 alert("Fail", dev, dv, mailaddr, mailfrom, alert_cmd, dosyslog);
 429                                         else if (i >= array.raid_disks &&
 430                                                  (disc.major || disc.minor) &&
 431                                                  st->devid[i] == makedev(disc.major, disc.minor) &&
 432                                                  ((newstate&change)&(1<<MD_DISK_FAULTY))
 433                                                 )
 434                                                 alert("FailSpare", dev, dv, mailaddr, mailfrom, alert_cmd, dosyslog);
 435                                         else if (i < array.raid_disks &&
 436                                                  ! (newstate & (1<<MD_DISK_REMOVED)) &&
 437                                                  (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) ||
 438                                                   ((newstate&change)&(1<<MD_DISK_ACTIVE)) ||
 439                                                   ((newstate&change)&(1<<MD_DISK_SYNC)))
 440                                                 )
 441                                                 alert("SpareActive", dev, dv, mailaddr, mailfrom, alert_cmd, dosyslog);
 442                                 }
 443                                 st->devstate[i] = newstate;
 444                                 st->devid[i] = makedev(disc.major, disc.minor);
 445                         }
 446                         st->active = array.active_disks;
 447                         st->working = array.working_disks;
 448                         st->spare = array.spare_disks;
 449                         st->failed = array.failed_disks;
 450                         st->utime = array.utime;
 451                         st->raid = array.raid_disks;
 452                         st->err = 0;
 453                 }
 454                 /* now check if there are any new devices found in mdstat */
 455                 if (scan) {
 456                         struct mdstat_ent *mse;
 457                         for (mse=mdstat; mse; mse=mse->next)
 458                                 if (mse->devnum != INT_MAX &&
 459                                    (!mse->level  || /* retrieve containers */
 460                                     (strcmp(mse->level, "raid0") != 0 &&
 461                                      strcmp(mse->level, "linear") != 0))
 462                                         ) {
 463                                         struct state *st = malloc(sizeof *st);
 464                                         mdu_array_info_t array;
 465                                         int fd;
 466                                         if (st == NULL)
 467                                                 continue;
 468                                         st->devname = strdup(get_md_name(mse->devnum));
 469                                         if ((fd = open(st->devname, O_RDONLY)) < 0 ||
 470                                             ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
 471                                                 /* no such array */
 472                                                 if (fd >=0) close(fd);
 473                                                 put_md_name(st->devname);
 474                                                 free(st->devname);
 475                                                 free(st);
 476                                                 continue;
 477                                         }
 478                                         close(fd);
 479                                         st->utime = 0;
 480                                         st->next = statelist;
 481                                         st->err = 1;
 482                                         st->devnum = mse->devnum;
 483                                         st->percent = -2;
 484                                         st->spare_group = NULL;
 485                                         st->expected_spares = -1;
 486                                         statelist = st;
 487                                         if (test)
 488                                                 alert("TestMessage", st->devname, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 489                                         alert("NewArray", st->devname, NULL, mailaddr, mailfrom, alert_cmd, dosyslog);
 490                                         new_found = 1;
 491                                 }
 492                 }
 493                 /* If an array has active < raid && spare == 0 && spare_group != NULL
 494                  * Look for another array with spare > 0 and active == raid and same spare_group
 495                  *  if found, choose a device and hotremove/hotadd
 496                  */
 497                 if (share) for (st = statelist; st; st=st->next)
 498                         if (st->active < st->raid &&
 499                             st->spare == 0 &&
 500                             st->spare_group != NULL) {
 501                                 struct state *st2;
 502                                 for (st2=statelist ; st2 ; st2=st2->next)
 503                                         if (st2 != st &&
 504                                             st2->spare > 0 &&
 505                                             st2->active == st2->raid &&
 506                                             st2->spare_group != NULL &&
 507                                             strcmp(st->spare_group, st2->spare_group) == 0) {
 508                                                 /* try to remove and add */
 509                                                 int fd1 = open(st->devname, O_RDONLY);
 510                                                 int fd2 = open(st2->devname, O_RDONLY);
 511                                                 int dev = -1;
 512                                                 int d;
 513                                                 if (fd1 < 0 || fd2 < 0) {
 514                                                         if (fd1>=0) close(fd1);
 515                                                         if (fd2>=0) close(fd2);
 516                                                         continue;
 517                                                 }
 518                                                 for (d=st2->raid; d < MaxDisks; d++) {
 519                                                         if (st2->devid[d] > 0 &&
 520                                                             st2->devstate[d] == 0) {
 521                                                                 dev = st2->devid[d];
 522                                                                 break;
 523                                                         }
 524                                                 }
 525                                                 if (dev > 0) {
 526                                                         struct mddev_dev devlist;
 527                                                         char devname[20];
 528                                                         devlist.next = NULL;
 529                                                         devlist.used = 0;
 530                                                         devlist.re_add = 0;
 531                                                         devlist.writemostly = 0;
 532                                                         devlist.devname = devname;
 533                                                         sprintf(devname, "%d:%d", major(dev), minor(dev));
 534
 535                                                         devlist.disposition = 'r';
 536                                                         if (Manage_subdevs(st2->devname, fd2, &devlist, -1, 0) == 0) {
 537                                                                 devlist.disposition = 'a';
 538                                                                 if (Manage_subdevs(st->devname, fd1, &devlist, -1, 0) == 0) {
 539                                                                         alert("MoveSpare", st->devname, st2->devname, mailaddr, mailfrom, alert_cmd, dosyslog);
 540                                                                         close(fd1);
 541                                                                         close(fd2);
 542                                                                         break;
 543                                                                 }
 544                                                                 else Manage_subdevs(st2->devname, fd2, &devlist, -1, 0);
 545                                                         }
 546                                                 }
 547                                                 close(fd1);
 548                                                 close(fd2);
 549                                         }
 550                         }
 551                 if (!new_found) {
 552                         if (oneshot)
 553                                 break;
 554                         else
 555                                 mdstat_wait(period);
 556                 }
 557                 test = 0;
 558         }
 559         if (pidfile)
 560                 unlink(pidfile);
 561         return 0;
 562 }
 563
 564
 565 static void alert(char *event, char *dev, char *disc, char *mailaddr, char *mailfrom, char *cmd,
 566                   int dosyslog)
 567 {
 568         int priority;
 569
 570         if (!cmd && !mailaddr) {
 571                 time_t now = time(0);
 572
 573                 printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
 574         }
 575         if (cmd) {
 576                 int pid = fork();
 577                 switch(pid) {
 578                 default:
 579                         waitpid(pid, NULL, 0);
 580                         break;
 581                 case -1:
 582                         break;
 583                 case 0:
 584                         execl(cmd, cmd, event, dev, disc, NULL);
 585                         exit(2);
 586                 }
 587         }
 588         if (mailaddr &&
 589             (strncmp(event, "Fail", 4)==0 ||
 590              strncmp(event, "Test", 4)==0 ||
 591              strncmp(event, "Spares", 6)==0 ||
 592              strncmp(event, "Degrade", 7)==0)) {
 593                 FILE *mp = popen(Sendmail, "w");
 594                 if (mp) {
 595                         FILE *mdstat;
 596                         char hname[256];
 597                         gethostname(hname, sizeof(hname));
 598                         signal(SIGPIPE, SIG_IGN);
 599                         if (mailfrom)
 600                                 fprintf(mp, "From: %s\n", mailfrom);
 601                         else
 602                                 fprintf(mp, "From: " Name " monitoring <root>\n");
 603                         fprintf(mp, "To: %s\n", mailaddr);
 604                         fprintf(mp, "Subject: %s event on %s:%s\n\n", event, dev, hname);
 605
 606                         fprintf(mp, "This is an automatically generated mail message from " Name "\n");
 607                         fprintf(mp, "running on %s\n\n", hname);
 608
 609                         fprintf(mp, "A %s event had been detected on md device %s.\n\n", event, dev);
 610
 611                         if (disc && disc[0] != ' ')
 612                                 fprintf(mp, "It could be related to component device %s.\n\n", disc);
 613                         if (disc && disc[0] == ' ')
 614                                 fprintf(mp, "Extra information:%s.\n\n", disc);
 615
 616                         fprintf(mp, "Faithfully yours, etc.\n");
 617
 618                         mdstat = fopen("/proc/mdstat", "r");
 619                         if (mdstat) {
 620                                 char buf[8192];
 621                                 int n;
 622                                 fprintf(mp, "\nP.S. The /proc/mdstat file currently contains the following:\n\n");
 623                                 while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0)
 624                                         n=fwrite(buf, 1, n, mp); /* yes, i don't care about the result */
 625                                 fclose(mdstat);
 626                         }
 627                         pclose(mp);
 628                 }
 629
 630         }
 631
 632         /* log the event to syslog maybe */
 633         if (dosyslog) {
 634                 /* Log at a different severity depending on the event.
 635                  *
 636                  * These are the critical events:  */
 637                 if (strncmp(event, "Fail", 4)==0 ||
 638                     strncmp(event, "Degrade", 7)==0 ||
 639                     strncmp(event, "DeviceDisappeared", 17)==0)
 640                         priority = LOG_CRIT;
 641                 /* Good to know about, but are not failures: */
 642                 else if (strncmp(event, "Rebuild", 7)==0 ||
 643                          strncmp(event, "MoveSpare", 9)==0 ||
 644                          strncmp(event, "Spares", 6) != 0)
 645                         priority = LOG_WARNING;
 646                 /* Everything else: */
 647                 else
 648                         priority = LOG_INFO;
 649
 650                 if (disc)
 651                         syslog(priority, "%s event detected on md device %s, component device %s", event, dev, disc);
 652                 else
 653                         syslog(priority, "%s event detected on md device %s", event, dev);
 654         }
 655 }
 656
 657 /* Not really Monitor but ... */
 658 int Wait(char *dev)
 659 {
 660         struct stat stb;
 661         int devnum;
 662         int rv = 1;
 663
 664         if (stat(dev, &stb) != 0) {
 665                 fprintf(stderr, Name ": Cannot find %s: %s\n", dev,
 666                         strerror(errno));
 667                 return 2;
 668         }
 669         devnum = stat2devnum(&stb);
 670
 671         while(1) {
 672                 struct mdstat_ent *ms = mdstat_read(1, 0);
 673                 struct mdstat_ent *e;
 674
 675                 for (e=ms ; e; e=e->next)
 676                         if (e->devnum == devnum)
 677                                 break;
 678
 679                 if (!e || e->percent < 0) {
 680                         if (e && e->metadata_version &&
 681                             strncmp(e->metadata_version, "external:", 9) == 0) {
 682                                 if (is_subarray(&e->metadata_version[9]))
 683                                         ping_monitor(&e->metadata_version[9]);
 684                                 else
 685                                         ping_monitor(devnum2devname(devnum));
 686                         }
 687                         free_mdstat(ms);
 688                         return rv;
 689                 }
 690                 free_mdstat(ms);
 691                 rv = 0;
 692                 mdstat_wait(5);
 693         }
 694 }