Manage.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 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@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_u.h"
  32 #include "md_p.h"
  33
  34 #define REGISTER_DEV            _IO (MD_MAJOR, 1)
  35 #define START_MD                _IO (MD_MAJOR, 2)
  36 #define STOP_MD                 _IO (MD_MAJOR, 3)
  37
  38 int Manage_ro(char *devname, int fd, int readonly)
  39 {
  40         /* switch to readonly or rw
  41          *
  42          * requires >= 0.90.0
  43          * first check that array is runing
  44          * use RESTART_ARRAY_RW or STOP_ARRAY_RO
  45          *
  46          */
  47         mdu_array_info_t array;
  48
  49         if (md_get_version(fd) < 9000) {
  50                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  51                 return 1;
  52         }
  53         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  54                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  55                         devname);
  56                 return 1;
  57         }
  58
  59         if (readonly>0) {
  60                 if (ioctl(fd, STOP_ARRAY_RO, NULL)) {
  61                         fprintf(stderr, Name ": failed to set readonly for %s: %s\n",
  62                                 devname, strerror(errno));
  63                         return 1;
  64                 }
  65         } else if (readonly < 0) {
  66                 if (ioctl(fd, RESTART_ARRAY_RW, NULL)) {
  67                         fprintf(stderr, Name ": failed to set writable for %s: %s\n",
  68                                 devname, strerror(errno));
  69                         return 1;
  70                 }
  71         }
  72         return 0;
  73 }
  74
  75 #ifndef MDASSEMBLE
  76
  77 int Manage_runstop(char *devname, int fd, int runstop, int quiet)
  78 {
  79         /* Run or stop the array. array must already be configured
  80          * required >= 0.90.0
  81          */
  82         mdu_param_t param; /* unused */
  83
  84         if (runstop == -1 && md_get_version(fd) < 9000) {
  85                 if (ioctl(fd, STOP_MD, 0)) {
  86                         if (!quiet) fprintf(stderr, Name ": stopping device %s failed: %s\n",
  87                                             devname, strerror(errno));
  88                         return 1;
  89                 }
  90         }
  91
  92         if (md_get_version(fd) < 9000) {
  93                 fprintf(stderr, Name ": need md driver version 0.90.0 or later\n");
  94                 return 1;
  95         }
  96         /*
  97         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
  98                 fprintf(stderr, Name ": %s does not appear to be active.\n",
  99                         devname);
 100                 return 1;
 101         }
 102         */
 103         if (runstop>0) {
 104                 if (ioctl(fd, RUN_ARRAY, &param)) {
 105                         fprintf(stderr, Name ": failed to run array %s: %s\n",
 106                                 devname, strerror(errno));
 107                         return 1;
 108                 }
 109                 if (quiet <= 0)
 110                         fprintf(stderr, Name ": started %s\n", devname);
 111         } else if (runstop < 0){
 112                 struct map_ent *map = NULL;
 113                 struct stat stb;
 114                 if (ioctl(fd, STOP_ARRAY, NULL)) {
 115                         if (quiet==0) {
 116                                 fprintf(stderr, Name ": fail to stop array %s: %s\n",
 117                                         devname, strerror(errno));
 118                                 if (errno == EBUSY)
 119                                         fprintf(stderr, "Perhaps a running "
 120                                                 "process, mounted filesystem "
 121                                                 "or active volume group?\n");
 122                         }
 123                         return 1;
 124                 }
 125                 if (quiet <= 0)
 126                         fprintf(stderr, Name ": stopped %s\n", devname);
 127                 if (fstat(fd, &stb) == 0) {
 128                         int devnum;
 129                         if (major(stb.st_rdev) == MD_MAJOR)
 130                                 devnum = minor(stb.st_rdev);
 131                         else
 132                                 devnum = -1-(minor(stb.st_rdev)>>6);
 133                         map_delete(&map, devnum);
 134                         map_write(map);
 135                         map_free(map);
 136                 }
 137         }
 138         return 0;
 139 }
 140
 141 int Manage_resize(char *devname, int fd, long long size, int raid_disks)
 142 {
 143         mdu_array_info_t info;
 144         if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
 145                 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
 146                         devname, strerror(errno));
 147                 return 1;
 148         }
 149         if (size >= 0)
 150                 info.size = size;
 151         if (raid_disks > 0)
 152                 info.raid_disks = raid_disks;
 153         if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
 154                 fprintf(stderr, Name ": Cannot set device size/shape for %s: %s\n",
 155                         devname, strerror(errno));
 156                 return 1;
 157         }
 158         return 0;
 159 }
 160
 161 int Manage_reconfig(char *devname, int fd, int layout)
 162 {
 163         mdu_array_info_t info;
 164         if (ioctl(fd, GET_ARRAY_INFO, &info) != 0) {
 165                 fprintf(stderr, Name ": Cannot get array information for %s: %s\n",
 166                         devname, strerror(errno));
 167                 return 1;
 168         }
 169         info.layout = layout;
 170         printf("layout set to %d\n", info.layout);
 171         if (ioctl(fd, SET_ARRAY_INFO, &info) != 0) {
 172                 fprintf(stderr, Name ": Cannot set layout for %s: %s\n",
 173                         devname, strerror(errno));
 174                 return 1;
 175         }
 176         return 0;
 177 }
 178
 179 int Manage_subdevs(char *devname, int fd,
 180                    mddev_dev_t devlist, int verbose)
 181 {
 182         /* do something to each dev.
 183          * devmode can be
 184          *  'a' - add the device
 185          *         try HOT_ADD_DISK
 186          *         If that fails EINVAL, try ADD_NEW_DISK
 187          *  'r' - remove the device HOT_REMOVE_DISK
 188          *        device can be 'faulty' or 'detached' in which case all
 189          *        matching devices are removed.
 190          *  'f' - set the device faulty SET_DISK_FAULTY
 191          *        device can be 'detached' in which case any device that
 192          *        is inaccessible will be marked faulty.
 193          */
 194         mdu_array_info_t array;
 195         mdu_disk_info_t disc;
 196         unsigned long long array_size;
 197         mddev_dev_t dv, next = NULL;
 198         struct stat stb;
 199         int j, jnext = 0;
 200         int tfd;
 201         struct supertype *st, *tst;
 202         int duuid[4];
 203         int ouuid[4];
 204
 205         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
 206                 fprintf(stderr, Name ": cannot get array info for %s\n",
 207                         devname);
 208                 return 1;
 209         }
 210
 211         /* array.size is only 32 bit and may be truncated.
 212          * So read from sysfs if possible, and record number of sectors
 213          */
 214
 215         array_size = get_component_size(fd);
 216         if (array_size <= 0)
 217                 array_size = array.size * 2;
 218
 219         tst = super_by_fd(fd);
 220         if (!tst) {
 221                 fprintf(stderr, Name ": unsupport array - version %d.%d\n",
 222                         array.major_version, array.minor_version);
 223                 return 1;
 224         }
 225
 226         for (dv = devlist, j=0 ; dv; dv = next, j = jnext) {
 227                 unsigned long long ldsize;
 228                 char dvname[20];
 229                 char *dnprintable = dv->devname;
 230
 231                 next = dv->next;
 232                 jnext = 0;
 233
 234                 if (strcmp(dv->devname, "failed")==0 ||
 235                     strcmp(dv->devname, "faulty")==0) {
 236                         if (dv->disposition != 'r') {
 237                                 fprintf(stderr, Name ": %s only meaningful "
 238                                         "with -r, not -%c\n",
 239                                         dv->devname, dv->disposition);
 240                                 return 1;
 241                         }
 242                         for (; j < array.raid_disks + array.nr_disks ; j++) {
 243                                 disc.number = j;
 244                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 245                                         continue;
 246                                 if (disc.major == 0 && disc.minor == 0)
 247                                         continue;
 248                                 if ((disc.state & 1) == 0) /* faulty */
 249                                         continue;
 250                                 stb.st_rdev = makedev(disc.major, disc.minor);
 251                                 next = dv;
 252                                 jnext = j+1;
 253                                 sprintf(dvname,"%d:%d", disc.major, disc.minor);
 254                                 dnprintable = dvname;
 255                                 break;
 256                         }
 257                         if (jnext == 0)
 258                                 continue;
 259                 } else if (strcmp(dv->devname, "detached") == 0) {
 260                         if (dv->disposition != 'r' && dv->disposition != 'f') {
 261                                 fprintf(stderr, Name ": %s only meaningful "
 262                                         "with -r of -f, not -%c\n",
 263                                         dv->devname, dv->disposition);
 264                                 return 1;
 265                         }
 266                         for (; j < array.raid_disks + array.nr_disks; j++) {
 267                                 int sfd;
 268                                 disc.number = j;
 269                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 270                                         continue;
 271                                 if (disc.major == 0 && disc.minor == 0)
 272                                         continue;
 273                                 sprintf(dvname,"%d:%d", disc.major, disc.minor);
 274                                 sfd = dev_open(dvname, O_RDONLY);
 275                                 if (sfd >= 0) {
 276                                         close(sfd);
 277                                         continue;
 278                                 }
 279                                 if (dv->disposition == 'f' &&
 280                                     (disc.state & 1) == 1) /* already faulty */
 281                                         continue;
 282                                 if (errno != ENXIO)
 283                                         continue;
 284                                 stb.st_rdev = makedev(disc.major, disc.minor);
 285                                 next = dv;
 286                                 jnext = j+1;
 287                                 dnprintable = dvname;
 288                                 break;
 289                         }
 290                         if (jnext == 0)
 291                                 continue;
 292                 } else {
 293                         j = 0;
 294
 295                         if (stat(dv->devname, &stb)) {
 296                                 fprintf(stderr, Name ": cannot find %s: %s\n",
 297                                         dv->devname, strerror(errno));
 298                                 return 1;
 299                         }
 300                         if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 301                                 fprintf(stderr, Name ": %s is not a "
 302                                         "block device.\n",
 303                                         dv->devname);
 304                                 return 1;
 305                         }
 306                 }
 307                 switch(dv->disposition){
 308                 default:
 309                         fprintf(stderr, Name ": internal error - devmode[%s]=%d\n",
 310                                 dv->devname, dv->disposition);
 311                         return 1;
 312                 case 'a':
 313                         /* add the device */
 314
 315                         /* Make sure it isn't in use (in 2.6 or later) */
 316                         tfd = open(dv->devname, O_RDONLY|O_EXCL);
 317                         if (tfd < 0) {
 318                                 fprintf(stderr, Name ": Cannot open %s: %s\n",
 319                                         dv->devname, strerror(errno));
 320                                 return 1;
 321                         }
 322                         remove_partitions(tfd);
 323
 324                         st = dup_super(tst);
 325
 326                         if (array.not_persistent==0)
 327                                 st->ss->load_super(st, tfd, NULL);
 328
 329                         if (!get_dev_size(tfd, dv->devname, &ldsize)) {
 330                                 close(tfd);
 331                                 return 1;
 332                         }
 333                         close(tfd);
 334
 335                         if (array.major_version == 0 &&
 336                             md_get_version(fd)%100 < 2) {
 337                                 if (ioctl(fd, HOT_ADD_DISK,
 338                                           (unsigned long)stb.st_rdev)==0) {
 339                                         if (verbose >= 0)
 340                                                 fprintf(stderr, Name ": hot added %s\n",
 341                                                         dv->devname);
 342                                         continue;
 343                                 }
 344
 345                                 fprintf(stderr, Name ": hot add failed for %s: %s\n",
 346                                         dv->devname, strerror(errno));
 347                                 return 1;
 348                         }
 349
 350                         if (array.not_persistent == 0) {
 351
 352                                 /* need to find a sample superblock to copy, and
 353                                  * a spare slot to use
 354                                  */
 355                                 for (j = 0; j < tst->max_devs; j++) {
 356                                         char *dev;
 357                                         int dfd;
 358                                         disc.number = j;
 359                                         if (ioctl(fd, GET_DISK_INFO, &disc))
 360                                                 continue;
 361                                         if (disc.major==0 && disc.minor==0)
 362                                                 continue;
 363                                         if ((disc.state & 4)==0) continue; /* sync */
 364                                         /* Looks like a good device to try */
 365                                         dev = map_dev(disc.major, disc.minor, 1);
 366                                         if (!dev) continue;
 367                                         dfd = dev_open(dev, O_RDONLY);
 368                                         if (dfd < 0) continue;
 369                                         if (tst->ss->load_super(tst, dfd,
 370                                                                 NULL)) {
 371                                                 close(dfd);
 372                                                 continue;
 373                                         }
 374                                         close(dfd);
 375                                         break;
 376                                 }
 377                                 if (!tst->sb) {
 378                                         fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n");
 379                                         return 1;
 380                                 }
 381
 382                                 /* Make sure device is large enough */
 383                                 if (tst->ss->avail_size(tst, ldsize/512) <
 384                                     array_size) {
 385                                         fprintf(stderr, Name ": %s not large enough to join array\n",
 386                                                 dv->devname);
 387                                         return 1;
 388                                 }
 389
 390                                 /* Possibly this device was recently part of the array
 391                                  * and was temporarily removed, and is now being re-added.
 392                                  * If so, we can simply re-add it.
 393                                  */
 394                                 tst->ss->uuid_from_super(tst, duuid);
 395
 396                                 /* re-add doesn't work for version-1 superblocks
 397                                  * before 2.6.18 :-(
 398                                  */
 399                                 if (array.major_version == 1 &&
 400                                     get_linux_version() <= 2006018)
 401                                         ;
 402                                 else if (st->sb) {
 403                                         st->ss->uuid_from_super(st, ouuid);
 404                                         if (memcmp(duuid, ouuid, sizeof(ouuid))==0) {
 405                                                 /* looks close enough for now.  Kernel
 406                                                  * will worry about whether a bitmap
 407                                                  * based reconstruction is possible.
 408                                                  */
 409                                                 struct mdinfo mdi;
 410                                                 st->ss->getinfo_super(st, &mdi);
 411                                                 disc.major = major(stb.st_rdev);
 412                                                 disc.minor = minor(stb.st_rdev);
 413                                                 disc.number = mdi.disk.number;
 414                                                 disc.raid_disk = mdi.disk.raid_disk;
 415                                                 disc.state = mdi.disk.state;
 416                                                 if (dv->writemostly == 1)
 417                                                         disc.state |= 1 << MD_DISK_WRITEMOSTLY;
 418                                                 if (dv->writemostly == 2)
 419                                                         disc.state &= ~(1 << MD_DISK_WRITEMOSTLY);
 420                                                 if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
 421                                                         if (verbose >= 0)
 422                                                                 fprintf(stderr, Name ": re-added %s\n", dv->devname);
 423                                                         continue;
 424                                                 }
 425                                                 if (errno == ENOMEM || errno == EROFS) {
 426                                                         fprintf(stderr, Name ": add new device failed for %s: %s\n",
 427                                                                 dv->devname, strerror(errno));
 428                                                         return 1;
 429                                                 }
 430                                                 /* fall back on normal-add */
 431                                         }
 432                                 }
 433                         } else {
 434                                 /* non-persistent. Must ensure that new drive
 435                                  * is at least array.size big.
 436                                  */
 437                                 if (ldsize/512 < array_size) {
 438                                         fprintf(stderr, Name ": %s not large enough to join array\n",
 439                                                 dv->devname);
 440                                         return 1;
 441                                 }
 442                         }
 443                         /* in 2.6.17 and earlier, version-1 superblocks won't
 444                          * use the number we write, but will choose a free number.
 445                          * we must choose the same free number, which requires
 446                          * starting at 'raid_disks' and counting up
 447                          */
 448                         for (j = array.raid_disks; j< tst->max_devs; j++) {
 449                                 disc.number = j;
 450                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 451                                         break;
 452                                 if (disc.major==0 && disc.minor==0)
 453                                         break;
 454                                 if (disc.state & 8) /* removed */
 455                                         break;
 456                         }
 457                         disc.major = major(stb.st_rdev);
 458                         disc.minor = minor(stb.st_rdev);
 459                         disc.number =j;
 460                         disc.state = 0;
 461                         if (array.not_persistent==0) {
 462                                 if (dv->writemostly == 1)
 463                                         disc.state |= 1 << MD_DISK_WRITEMOSTLY;
 464                                 tst->ss->add_to_super(tst, &disc);
 465                                 if (tst->ss->write_init_super(tst, &disc,
 466                                                               dv->devname))
 467                                         return 1;
 468                         } else if (dv->re_add) {
 469                                 /*  this had better be raid1.
 470                                  * As we are "--re-add"ing we must find a spare slot
 471                                  * to fill.
 472                                  */
 473                                 char *used = malloc(array.raid_disks);
 474                                 memset(used, 0, array.raid_disks);
 475                                 for (j=0; j< tst->max_devs; j++) {
 476                                         mdu_disk_info_t disc2;
 477                                         disc2.number = j;
 478                                         if (ioctl(fd, GET_DISK_INFO, &disc2))
 479                                                 continue;
 480                                         if (disc2.major==0 && disc2.minor==0)
 481                                                 continue;
 482                                         if (disc2.state & 8) /* removed */
 483                                                 continue;
 484                                         if (disc2.raid_disk < 0)
 485                                                 continue;
 486                                         if (disc2.raid_disk > array.raid_disks)
 487                                                 continue;
 488                                         used[disc2.raid_disk] = 1;
 489                                 }
 490                                 for (j=0 ; j<array.raid_disks; j++)
 491                                         if (!used[j]) {
 492                                                 disc.raid_disk = j;
 493                                                 disc.state |= (1<<MD_DISK_SYNC);
 494                                                 break;
 495                                         }
 496                         }
 497                         if (dv->writemostly == 1)
 498                                 disc.state |= (1 << MD_DISK_WRITEMOSTLY);
 499                         if (ioctl(fd,ADD_NEW_DISK, &disc)) {
 500                                 fprintf(stderr, Name ": add new device failed for %s as %d: %s\n",
 501                                         dv->devname, j, strerror(errno));
 502                                 return 1;
 503                         }
 504                         if (verbose >= 0)
 505                                 fprintf(stderr, Name ": added %s\n", dv->devname);
 506                         break;
 507
 508                 case 'r':
 509                         /* hot remove */
 510                         /* FIXME check that it is a current member */
 511                         if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
 512                                 fprintf(stderr, Name ": hot remove failed "
 513                                         "for %s: %s\n", dnprintable,
 514                                         strerror(errno));
 515                                 return 1;
 516                         }
 517                         if (verbose >= 0)
 518                                 fprintf(stderr, Name ": hot removed %s\n",
 519                                         dnprintable);
 520                         break;
 521
 522                 case 'f': /* set faulty */
 523                         /* FIXME check current member */
 524                         if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
 525                                 fprintf(stderr, Name ": set device faulty failed for %s:  %s\n",
 526                                         dnprintable, strerror(errno));
 527                                 return 1;
 528                         }
 529                         if (verbose >= 0)
 530                                 fprintf(stderr, Name ": set %s faulty in %s\n",
 531                                         dnprintable, devname);
 532                         break;
 533                 }
 534         }
 535         return 0;
 536
 537 }
 538
 539 int autodetect(void)
 540 {
 541         /* Open any md device, and issue the RAID_AUTORUN ioctl */
 542         int rv = 1;
 543         int fd = dev_open("9:0", O_RDONLY);
 544         if (fd >= 0) {
 545                 if (ioctl(fd, RAID_AUTORUN, 0) == 0)
 546                         rv = 0;
 547                 close(fd);
 548         }
 549         return rv;
 550 }
 551 #endif