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 static int
 175 add_remove_device_container(int fd, int add_remove, struct stat *stb)
 176 {
 177         int devnum = fd2devnum(fd);
 178         char *devname = devnum2devname(devnum);
 179         int sfd = devname ? connect_monitor(devname) : -1;
 180         struct md_message msg;
 181         int err = 0;
 182
 183         if (devname && sfd < 0) {
 184                 fprintf(stderr, Name ": Cannot connect to monitor for %s: %s\n",
 185                         devname, strerror(errno));
 186                 free(devname);
 187                 return 1;
 188         } else if (sfd < 0) {
 189                 fprintf(stderr, Name ": Cannot determine container name for"
 190                         " device number %d\n", devnum);
 191                 return 1;
 192         }
 193
 194         if (add_remove)
 195                 ack(sfd, 0, 0);
 196         else if (send_remove_device(sfd, stb->st_rdev, 0, 0) != 0) {
 197                 fprintf(stderr, Name ": Failed to send \'%s device\'"
 198                         " message to the container monitor\n",
 199                         add_remove ? "add" : "remove");
 200                 err = 1;
 201         }
 202
 203         /* check the reply */
 204         if (!err && receive_message(sfd, &msg, 0) != 0) {
 205                 fprintf(stderr, Name ": Failed to receive an acknowledgement"
 206                         " from the container monitor\n");
 207                 err = 1;
 208         }
 209
 210         if (!err && msg.seq != 0) {
 211                 fprintf(stderr, Name ": %s device failed error code %d\n",
 212                         add_remove ? "Add" : "Remove", msg.seq);
 213                 err = 1;
 214         }
 215
 216         free(devname);
 217         close(sfd);
 218
 219         return err;
 220 }
 221
 222 int Manage_subdevs(char *devname, int fd,
 223                    mddev_dev_t devlist, int verbose)
 224 {
 225         /* do something to each dev.
 226          * devmode can be
 227          *  'a' - add the device
 228          *         try HOT_ADD_DISK
 229          *         If that fails EINVAL, try ADD_NEW_DISK
 230          *  'r' - remove the device HOT_REMOVE_DISK
 231          *        device can be 'faulty' or 'detached' in which case all
 232          *        matching devices are removed.
 233          *  'f' - set the device faulty SET_DISK_FAULTY
 234          *        device can be 'detached' in which case any device that
 235          *        is inaccessible will be marked faulty.
 236          */
 237         mdu_array_info_t array;
 238         mdu_disk_info_t disc;
 239         unsigned long long array_size;
 240         mddev_dev_t dv, next = NULL;
 241         struct stat stb;
 242         int j, jnext = 0;
 243         int tfd;
 244         struct supertype *st, *tst;
 245         int duuid[4];
 246         int ouuid[4];
 247
 248         if (ioctl(fd, GET_ARRAY_INFO, &array)) {
 249                 fprintf(stderr, Name ": cannot get array info for %s\n",
 250                         devname);
 251                 return 1;
 252         }
 253
 254         /* array.size is only 32 bit and may be truncated.
 255          * So read from sysfs if possible, and record number of sectors
 256          */
 257
 258         array_size = get_component_size(fd);
 259         if (array_size <= 0)
 260                 array_size = array.size * 2;
 261
 262         tst = super_by_fd(fd);
 263         if (!tst) {
 264                 fprintf(stderr, Name ": unsupport array - version %d.%d\n",
 265                         array.major_version, array.minor_version);
 266                 return 1;
 267         }
 268
 269         for (dv = devlist, j=0 ; dv; dv = next, j = jnext) {
 270                 unsigned long long ldsize;
 271                 char dvname[20];
 272                 char *dnprintable = dv->devname;
 273
 274                 next = dv->next;
 275                 jnext = 0;
 276
 277                 if (strcmp(dv->devname, "failed")==0 ||
 278                     strcmp(dv->devname, "faulty")==0) {
 279                         if (dv->disposition != 'r') {
 280                                 fprintf(stderr, Name ": %s only meaningful "
 281                                         "with -r, not -%c\n",
 282                                         dv->devname, dv->disposition);
 283                                 return 1;
 284                         }
 285                         for (; j < array.raid_disks + array.nr_disks ; j++) {
 286                                 disc.number = j;
 287                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 288                                         continue;
 289                                 if (disc.major == 0 && disc.minor == 0)
 290                                         continue;
 291                                 if ((disc.state & 1) == 0) /* faulty */
 292                                         continue;
 293                                 stb.st_rdev = makedev(disc.major, disc.minor);
 294                                 next = dv;
 295                                 jnext = j+1;
 296                                 sprintf(dvname,"%d:%d", disc.major, disc.minor);
 297                                 dnprintable = dvname;
 298                                 break;
 299                         }
 300                         if (jnext == 0)
 301                                 continue;
 302                 } else if (strcmp(dv->devname, "detached") == 0) {
 303                         if (dv->disposition != 'r' && dv->disposition != 'f') {
 304                                 fprintf(stderr, Name ": %s only meaningful "
 305                                         "with -r of -f, not -%c\n",
 306                                         dv->devname, dv->disposition);
 307                                 return 1;
 308                         }
 309                         for (; j < array.raid_disks + array.nr_disks; j++) {
 310                                 int sfd;
 311                                 disc.number = j;
 312                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 313                                         continue;
 314                                 if (disc.major == 0 && disc.minor == 0)
 315                                         continue;
 316                                 sprintf(dvname,"%d:%d", disc.major, disc.minor);
 317                                 sfd = dev_open(dvname, O_RDONLY);
 318                                 if (sfd >= 0) {
 319                                         close(sfd);
 320                                         continue;
 321                                 }
 322                                 if (dv->disposition == 'f' &&
 323                                     (disc.state & 1) == 1) /* already faulty */
 324                                         continue;
 325                                 if (errno != ENXIO)
 326                                         continue;
 327                                 stb.st_rdev = makedev(disc.major, disc.minor);
 328                                 next = dv;
 329                                 jnext = j+1;
 330                                 dnprintable = dvname;
 331                                 break;
 332                         }
 333                         if (jnext == 0)
 334                                 continue;
 335                 } else {
 336                         j = 0;
 337
 338                         if (stat(dv->devname, &stb)) {
 339                                 fprintf(stderr, Name ": cannot find %s: %s\n",
 340                                         dv->devname, strerror(errno));
 341                                 return 1;
 342                         }
 343                         if ((stb.st_mode & S_IFMT) != S_IFBLK) {
 344                                 fprintf(stderr, Name ": %s is not a "
 345                                         "block device.\n",
 346                                         dv->devname);
 347                                 return 1;
 348                         }
 349                 }
 350                 switch(dv->disposition){
 351                 default:
 352                         fprintf(stderr, Name ": internal error - devmode[%s]=%d\n",
 353                                 dv->devname, dv->disposition);
 354                         return 1;
 355                 case 'a':
 356                         /* add the device */
 357                         if (tst->subarray[0]) {
 358                                 fprintf(stderr, Name ": Cannot add disks to a"
 359                                         " \'member\' array, perform this"
 360                                         " operation on the parent container\n");
 361                                 return 1;
 362                         } else if (tst->ss->external)
 363                                 return add_remove_device_container(fd, 1, &stb);
 364                         /* Make sure it isn't in use (in 2.6 or later) */
 365                         tfd = open(dv->devname, O_RDONLY|O_EXCL);
 366                         if (tfd < 0) {
 367                                 fprintf(stderr, Name ": Cannot open %s: %s\n",
 368                                         dv->devname, strerror(errno));
 369                                 return 1;
 370                         }
 371                         remove_partitions(tfd);
 372
 373                         st = dup_super(tst);
 374
 375                         if (array.not_persistent==0)
 376                                 st->ss->load_super(st, tfd, NULL);
 377
 378                         if (!get_dev_size(tfd, dv->devname, &ldsize)) {
 379                                 close(tfd);
 380                                 return 1;
 381                         }
 382                         close(tfd);
 383
 384                         if (array.major_version == 0 &&
 385                             md_get_version(fd)%100 < 2) {
 386                                 if (ioctl(fd, HOT_ADD_DISK,
 387                                           (unsigned long)stb.st_rdev)==0) {
 388                                         if (verbose >= 0)
 389                                                 fprintf(stderr, Name ": hot added %s\n",
 390                                                         dv->devname);
 391                                         continue;
 392                                 }
 393
 394                                 fprintf(stderr, Name ": hot add failed for %s: %s\n",
 395                                         dv->devname, strerror(errno));
 396                                 return 1;
 397                         }
 398
 399                         if (array.not_persistent == 0) {
 400
 401                                 /* Make sure device is large enough */
 402                                 if (tst->ss->avail_size(tst, ldsize/512) <
 403                                     array_size) {
 404                                         fprintf(stderr, Name ": %s not large enough to join array\n",
 405                                                 dv->devname);
 406                                         return 1;
 407                                 }
 408
 409                                 /* need to find a sample superblock to copy, and
 410                                  * a spare slot to use
 411                                  */
 412                                 for (j = 0; j < tst->max_devs; j++) {
 413                                         char *dev;
 414                                         int dfd;
 415                                         disc.number = j;
 416                                         if (ioctl(fd, GET_DISK_INFO, &disc))
 417                                                 continue;
 418                                         if (disc.major==0 && disc.minor==0)
 419                                                 continue;
 420                                         if ((disc.state & 4)==0) continue; /* sync */
 421                                         /* Looks like a good device to try */
 422                                         dev = map_dev(disc.major, disc.minor, 1);
 423                                         if (!dev) continue;
 424                                         dfd = dev_open(dev, O_RDONLY);
 425                                         if (dfd < 0) continue;
 426                                         if (tst->ss->load_super(tst, dfd,
 427                                                                 NULL)) {
 428                                                 close(dfd);
 429                                                 continue;
 430                                         }
 431                                         close(dfd);
 432                                         break;
 433                                 }
 434                                 if (!tst->sb) {
 435                                         fprintf(stderr, Name ": cannot find valid superblock in this array - HELP\n");
 436                                         return 1;
 437                                 }
 438                                 /* Possibly this device was recently part of the array
 439                                  * and was temporarily removed, and is now being re-added.
 440                                  * If so, we can simply re-add it.
 441                                  */
 442                                 tst->ss->uuid_from_super(tst, duuid);
 443
 444                                 /* re-add doesn't work for version-1 superblocks
 445                                  * before 2.6.18 :-(
 446                                  */
 447                                 if (array.major_version == 1 &&
 448                                     get_linux_version() <= 2006018)
 449                                         ;
 450                                 else if (st->sb) {
 451                                         st->ss->uuid_from_super(st, ouuid);
 452                                         if (memcmp(duuid, ouuid, sizeof(ouuid))==0) {
 453                                                 /* looks close enough for now.  Kernel
 454                                                  * will worry about whether a bitmap
 455                                                  * based reconstruction is possible.
 456                                                  */
 457                                                 struct mdinfo mdi;
 458                                                 st->ss->getinfo_super(st, &mdi);
 459                                                 disc.major = major(stb.st_rdev);
 460                                                 disc.minor = minor(stb.st_rdev);
 461                                                 disc.number = mdi.disk.number;
 462                                                 disc.raid_disk = mdi.disk.raid_disk;
 463                                                 disc.state = mdi.disk.state;
 464                                                 if (dv->writemostly)
 465                                                         disc.state |= 1 << MD_DISK_WRITEMOSTLY;
 466                                                 if (ioctl(fd, ADD_NEW_DISK, &disc) == 0) {
 467                                                         if (verbose >= 0)
 468                                                                 fprintf(stderr, Name ": re-added %s\n", dv->devname);
 469                                                         continue;
 470                                                 }
 471                                                 /* fall back on normal-add */
 472                                         }
 473                                 }
 474                         } else {
 475                                 /* non-persistent. Must ensure that new drive
 476                                  * is at least array.size big.
 477                                  */
 478                                 if (ldsize/512 < array_size) {
 479                                         fprintf(stderr, Name ": %s not large enough to join array\n",
 480                                                 dv->devname);
 481                                         return 1;
 482                                 }
 483                         }
 484                         /* in 2.6.17 and earlier, version-1 superblocks won't
 485                          * use the number we write, but will choose a free number.
 486                          * we must choose the same free number, which requires
 487                          * starting at 'raid_disks' and counting up
 488                          */
 489                         for (j = array.raid_disks; j< tst->max_devs; j++) {
 490                                 disc.number = j;
 491                                 if (ioctl(fd, GET_DISK_INFO, &disc))
 492                                         break;
 493                                 if (disc.major==0 && disc.minor==0)
 494                                         break;
 495                                 if (disc.state & 8) /* removed */
 496                                         break;
 497                         }
 498                         disc.major = major(stb.st_rdev);
 499                         disc.minor = minor(stb.st_rdev);
 500                         disc.number =j;
 501                         disc.state = 0;
 502                         if (array.not_persistent==0) {
 503                                 int dfd;
 504                                 if (dv->writemostly)
 505                                         disc.state |= 1 << MD_DISK_WRITEMOSTLY;
 506                                 dfd = open(dv->devname, O_RDWR | O_EXCL);
 507                                 tst->ss->add_to_super(tst, &disc, dfd,
 508                                                       dv->devname);
 509                                 /* write_init_super will close 'dfd' */
 510                                 if (tst->ss->write_init_super(tst))
 511                                         return 1;
 512                         } else if (dv->re_add) {
 513                                 /*  this had better be raid1.
 514                                  * As we are "--re-add"ing we must find a spare slot
 515                                  * to fill.
 516                                  */
 517                                 char *used = malloc(array.raid_disks);
 518                                 memset(used, 0, array.raid_disks);
 519                                 for (j=0; j< tst->max_devs; j++) {
 520                                         mdu_disk_info_t disc2;
 521                                         disc2.number = j;
 522                                         if (ioctl(fd, GET_DISK_INFO, &disc2))
 523                                                 continue;
 524                                         if (disc2.major==0 && disc2.minor==0)
 525                                                 continue;
 526                                         if (disc2.state & 8) /* removed */
 527                                                 continue;
 528                                         if (disc2.raid_disk < 0)
 529                                                 continue;
 530                                         if (disc2.raid_disk > array.raid_disks)
 531                                                 continue;
 532                                         used[disc2.raid_disk] = 1;
 533                                 }
 534                                 for (j=0 ; j<array.raid_disks; j++)
 535                                         if (!used[j]) {
 536                                                 disc.raid_disk = j;
 537                                                 disc.state |= (1<<MD_DISK_SYNC);
 538                                                 break;
 539                                         }
 540                         }
 541                         if (dv->writemostly)
 542                                 disc.state |= (1 << MD_DISK_WRITEMOSTLY);
 543                         if (ioctl(fd,ADD_NEW_DISK, &disc)) {
 544                                 fprintf(stderr, Name ": add new device failed for %s as %d: %s\n",
 545                                         dv->devname, j, strerror(errno));
 546                                 return 1;
 547                         }
 548                         if (verbose >= 0)
 549                                 fprintf(stderr, Name ": added %s\n", dv->devname);
 550                         break;
 551
 552                 case 'r':
 553                         /* hot remove */
 554                         if (tst->subarray[0]) {
 555                                 fprintf(stderr, Name ": Cannot remove disks from a"
 556                                         " \'member\' array, perform this"
 557                                         " operation on the parent container\n");
 558                                 return 1;
 559                         } else if (tst->ss->external)
 560                                 return add_remove_device_container(fd, 0, &stb);
 561                         /* FIXME check that it is a current member */
 562                         if (ioctl(fd, HOT_REMOVE_DISK, (unsigned long)stb.st_rdev)) {
 563                                 fprintf(stderr, Name ": hot remove failed "
 564                                         "for %s: %s\n", dnprintable,
 565                                         strerror(errno));
 566                                 return 1;
 567                         }
 568                         if (verbose >= 0)
 569                                 fprintf(stderr, Name ": hot removed %s\n",
 570                                         dnprintable);
 571                         break;
 572
 573                 case 'f': /* set faulty */
 574                         /* FIXME check current member */
 575                         if (ioctl(fd, SET_DISK_FAULTY, (unsigned long) stb.st_rdev)) {
 576                                 fprintf(stderr, Name ": set device faulty failed for %s:  %s\n",
 577                                         dnprintable, strerror(errno));
 578                                 return 1;
 579                         }
 580                         if (verbose >= 0)
 581                                 fprintf(stderr, Name ": set %s faulty in %s\n",
 582                                         dnprintable, devname);
 583                         break;
 584                 }
 585         }
 586         return 0;
 587
 588 }
 589
 590 int autodetect(void)
 591 {
 592         /* Open any md device, and issue the RAID_AUTORUN ioctl */
 593         int rv = 1;
 594         int fd = dev_open("9:0", O_RDONLY);
 595         if (fd >= 0) {
 596                 if (ioctl(fd, RAID_AUTORUN, 0) == 0)
 597                         rv = 0;
 598                 close(fd);
 599         }
 600         return rv;
 601 }
 602 #endif