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