super0.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 #define HAVE_STDINT_H 1
  26 #include "mdadm.h"
  27 #include "sha1.h"
  28 /*
  29  * All handling for the 0.90.0 version superblock is in
  30  * this file.
  31  * This includes:
  32  *   - finding, loading, and writing the superblock.
  33  *   - initialising a new superblock
  34  *   - printing the superblock for --examine
  35  *   - printing part of the superblock for --detail
  36  * .. other stuff
  37  */
  38
  39 static unsigned long calc_sb0_csum(mdp_super_t *super)
  40 {
  41         unsigned long csum = super->sb_csum;
  42         unsigned long newcsum;
  43         super->sb_csum= 0 ;
  44         newcsum = calc_csum(super, MD_SB_BYTES);
  45         super->sb_csum = csum;
  46         return newcsum;
  47 }
  48
  49 static void super0_swap_endian(struct mdp_superblock_s *sb)
  50 {
  51         /* as super0 superblocks are host-endian, it is sometimes
  52          * useful to be able to swap the endianness
  53          * as (almost) everything is u32's we byte-swap every 4byte
  54          * number.
  55          * We then also have to swap the events_hi and events_lo
  56          */
  57         char *sbc = (char *)sb;
  58         __u32 t32;
  59         int i;
  60
  61         for (i=0; i < MD_SB_BYTES ; i+=4) {
  62                 char t = sbc[i];
  63                 sbc[i] = sbc[i+3];
  64                 sbc[i+3] = t;
  65                 t=sbc[i+1];
  66                 sbc[i+1]=sbc[i+2];
  67                 sbc[i+2]=t;
  68         }
  69         t32 = sb->events_hi;
  70         sb->events_hi = sb->events_lo;
  71         sb->events_lo = t32;
  72
  73         t32 = sb->cp_events_hi;
  74         sb->cp_events_hi = sb->cp_events_lo;
  75         sb->cp_events_lo = t32;
  76
  77 }
  78
  79 #ifndef MDASSEMBLE
  80
  81 static void examine_super0(struct supertype *st, char *homehost)
  82 {
  83         mdp_super_t *sb = st->sb;
  84         time_t atime;
  85         int d;
  86         int delta_extra = 0;
  87         char *c;
  88
  89         printf("          Magic : %08x\n", sb->md_magic);
  90         printf("        Version : %d.%02d.%02d\n", sb->major_version, sb->minor_version,
  91                sb->patch_version);
  92         if (sb->minor_version >= 90) {
  93                 printf("           UUID : %08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
  94                        sb->set_uuid2, sb->set_uuid3);
  95                 if (homehost) {
  96                         char buf[20];
  97                         void *hash = sha1_buffer(homehost,
  98                                                  strlen(homehost),
  99                                                  buf);
 100                         if (memcmp(&sb->set_uuid2, hash, 8)==0)
 101                                 printf(" (local to host %s)", homehost);
 102                 }
 103                 printf("\n");
 104         } else
 105                 printf("           UUID : %08x\n", sb->set_uuid0);
 106
 107         if (sb->not_persistent)
 108                 printf("           Eedk : not persistent\n");
 109
 110         atime = sb->ctime;
 111         printf("  Creation Time : %.24s\n", ctime(&atime));
 112         c=map_num(pers, sb->level);
 113         printf("     Raid Level : %s\n", c?c:"-unknown-");
 114         if ((int)sb->level > 0) {
 115                 int ddsks = 0, ddsks_denom = 1;
 116                 printf("  Used Dev Size : %d%s\n", sb->size,
 117                        human_size((long long)sb->size<<10));
 118                 switch(sb->level) {
 119                 case 1: ddsks=1;break;
 120                 case 4:
 121                 case 5: ddsks = sb->raid_disks-1; break;
 122                 case 6: ddsks = sb->raid_disks-2; break;
 123                 case 10: ddsks = sb->raid_disks;
 124                         ddsks_denom =  (sb->layout&255) * ((sb->layout>>8)&255);
 125                 }
 126                 if (ddsks) {
 127                         long long asize = sb->size;
 128                         asize = (asize << 10) * ddsks / ddsks_denom;
 129                         printf("     Array Size : %llu%s\n",
 130                                asize >> 10,  human_size(asize));
 131                 }
 132         }
 133         printf("   Raid Devices : %d\n", sb->raid_disks);
 134         printf("  Total Devices : %d\n", sb->nr_disks);
 135         printf("Preferred Minor : %d\n", sb->md_minor);
 136         printf("\n");
 137         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 138                 printf("  Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
 139                 if (sb->delta_disks) {
 140                         printf("  Delta Devices : %d", sb->delta_disks);
 141                         printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
 142                         if (((int)sb->delta_disks) < 0)
 143                                 delta_extra = - sb->delta_disks;
 144                 }
 145                 if (sb->new_level != sb->level) {
 146                         c = map_num(pers, sb->new_level);
 147                         printf("      New Level : %s\n", c?c:"-unknown-");
 148                 }
 149                 if (sb->new_layout != sb->layout) {
 150                         if (sb->level == 5) {
 151                                 c = map_num(r5layout, sb->new_layout);
 152                                 printf("     New Layout : %s\n", c?c:"-unknown-");
 153                         }
 154                         if (sb->level == 6) {
 155                                 c = map_num(r6layout, sb->new_layout);
 156                                 printf("     New Layout : %s\n", c?c:"-unknown-");
 157                         }
 158                         if (sb->level == 10) {
 159                                 printf("     New Layout : near=%d, %s=%d\n",
 160                                        sb->new_layout&255,
 161                                        (sb->new_layout&0x10000)?"offset":"far",
 162                                        (sb->new_layout>>8)&255);
 163                         }
 164                 }
 165                 if (sb->new_chunk != sb->chunk_size)
 166                         printf("  New Chunksize : %d\n", sb->new_chunk);
 167                 printf("\n");
 168         }
 169         atime = sb->utime;
 170         printf("    Update Time : %.24s\n", ctime(&atime));
 171         printf("          State : %s\n",
 172                (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
 173         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
 174                 printf("Internal Bitmap : present\n");
 175         printf(" Active Devices : %d\n", sb->active_disks);
 176         printf("Working Devices : %d\n", sb->working_disks);
 177         printf(" Failed Devices : %d\n", sb->failed_disks);
 178         printf("  Spare Devices : %d\n", sb->spare_disks);
 179         if (calc_sb0_csum(sb) == sb->sb_csum)
 180                 printf("       Checksum : %x - correct\n", sb->sb_csum);
 181         else
 182                 printf("       Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
 183         printf("         Events : %llu\n",
 184                ((unsigned long long)sb->events_hi << 32)
 185                + sb->events_lo);
 186         printf("\n");
 187         if (sb->level == 5) {
 188                 c = map_num(r5layout, sb->layout);
 189                 printf("         Layout : %s\n", c?c:"-unknown-");
 190         }
 191         if (sb->level == 6) {
 192                 c = map_num(r6layout, sb->layout);
 193                 printf("         Layout : %s\n", c?c:"-unknown-");
 194         }
 195         if (sb->level == 10) {
 196                 printf("         Layout :");
 197                 print_r10_layout(sb->layout);
 198                 printf("\n");
 199         }
 200         switch(sb->level) {
 201         case 0:
 202         case 4:
 203         case 5:
 204         case 6:
 205         case 10:
 206                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 207                 break;
 208         case -1:
 209                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 210                 break;
 211         default: break;
 212         }
 213         printf("\n");
 214         printf("      Number   Major   Minor   RaidDevice State\n");
 215         for (d= -1; d<(signed int)(sb->raid_disks+delta_extra + sb->spare_disks); d++) {
 216                 mdp_disk_t *dp;
 217                 char *dv;
 218                 char nb[5];
 219                 int wonly;
 220                 if (d>=0) dp = &sb->disks[d];
 221                 else dp = &sb->this_disk;
 222                 snprintf(nb, sizeof(nb), "%4d", d);
 223                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 224                        dp->number, dp->major, dp->minor, dp->raid_disk);
 225                 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
 226                 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 227                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 228                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 229                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 230                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 231                 if (wonly) printf(" write-mostly");
 232                 if (dp->state == 0) printf(" spare");
 233                 if ((dv=map_dev(dp->major, dp->minor, 0)))
 234                         printf("   %s", dv);
 235                 printf("\n");
 236                 if (d == -1) printf("\n");
 237         }
 238 }
 239
 240 static void brief_examine_super0(struct supertype *st, int verbose)
 241 {
 242         mdp_super_t *sb = st->sb;
 243         char *c=map_num(pers, sb->level);
 244         char devname[20];
 245
 246         sprintf(devname, "/dev/md%d", sb->md_minor);
 247
 248         if (verbose) {
 249                 printf("ARRAY %s level=%s num-devices=%d",
 250                        devname,
 251                        c?c:"-unknown-", sb->raid_disks);
 252         } else
 253                 printf("ARRAY %s", devname);
 254
 255         if (sb->minor_version >= 90)
 256                 printf(" UUID=%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 257                        sb->set_uuid2, sb->set_uuid3);
 258         else
 259                 printf(" UUID=%08x", sb->set_uuid0);
 260         printf("\n");
 261 }
 262
 263 static void export_examine_super0(struct supertype *st)
 264 {
 265         mdp_super_t *sb = st->sb;
 266
 267         printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
 268         printf("MD_DEVICES=%d\n", sb->raid_disks);
 269         if (sb->minor_version >= 90)
 270                 printf("MD_UUID=%08x:%08x:%08x:%08x\n",
 271                        sb->set_uuid0, sb->set_uuid1,
 272                        sb->set_uuid2, sb->set_uuid3);
 273         else
 274                 printf("MD_UUID=%08x\n", sb->set_uuid0);
 275         printf("MD_UPDATE_TIME=%llu\n",
 276                __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
 277         printf("MD_EVENTS=%llu\n",
 278                ((unsigned long long)sb->events_hi << 32)
 279                + sb->events_lo);
 280 }
 281
 282 static int copy_metadata0(struct supertype *st, int from, int to)
 283 {
 284         /* Read 64K from the appropriate offset of 'from'
 285          * and if it looks a little like a 0.90 superblock,
 286          * write it to the same offset of 'to'
 287          */
 288         void *buf;
 289         unsigned long long dsize, offset;
 290         const int bufsize = 64*1024;
 291         mdp_super_t *super;
 292
 293         if (posix_memalign(&buf, 4096, bufsize) != 0)
 294                 return 1;
 295
 296         if (!get_dev_size(from, NULL, &dsize))
 297                 goto err;
 298
 299         if (dsize < MD_RESERVED_SECTORS*512)
 300                 goto err;
 301
 302         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 303
 304         offset *= 512;
 305
 306         if (lseek64(from, offset, 0) < 0LL)
 307                 goto err;
 308         if (read(from, buf, bufsize) != bufsize)
 309                 goto err;
 310
 311         if (lseek64(to, offset, 0) < 0LL)
 312                 goto err;
 313         super = buf;
 314         if (super->md_magic != MD_SB_MAGIC ||
 315             super->major_version != 0 ||
 316             calc_sb0_csum(super) != super->sb_csum)
 317                 goto err;
 318         if (write(to, buf, bufsize) != bufsize)
 319                 goto err;
 320         free(buf);
 321         return 0;
 322 err:
 323         free(buf);
 324         return 1;
 325 }
 326
 327 static void detail_super0(struct supertype *st, char *homehost)
 328 {
 329         mdp_super_t *sb = st->sb;
 330         printf("           UUID : ");
 331         if (sb->minor_version >= 90)
 332                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 333                        sb->set_uuid2, sb->set_uuid3);
 334         else
 335                 printf("%08x", sb->set_uuid0);
 336         if (homehost) {
 337                 char buf[20];
 338                 void *hash = sha1_buffer(homehost,
 339                                          strlen(homehost),
 340                                          buf);
 341                 if (memcmp(&sb->set_uuid2, hash, 8)==0)
 342                         printf(" (local to host %s)", homehost);
 343         }
 344         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 345 }
 346
 347 static void brief_detail_super0(struct supertype *st)
 348 {
 349         mdp_super_t *sb = st->sb;
 350         printf(" UUID=");
 351         if (sb->minor_version >= 90)
 352                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 353                        sb->set_uuid2, sb->set_uuid3);
 354         else
 355                 printf("%08x", sb->set_uuid0);
 356 }
 357 #endif
 358
 359 static int match_home0(struct supertype *st, char *homehost)
 360 {
 361         mdp_super_t *sb = st->sb;
 362         char buf[20];
 363         char *hash;
 364
 365         if (!homehost)
 366                 return 0;
 367         hash = sha1_buffer(homehost,
 368                            strlen(homehost),
 369                            buf);
 370
 371         return (memcmp(&sb->set_uuid2, hash, 8)==0);
 372 }
 373
 374 static void uuid_from_super0(struct supertype *st, int uuid[4])
 375 {
 376         mdp_super_t *super = st->sb;
 377         uuid[0] = super->set_uuid0;
 378         if (super->minor_version >= 90) {
 379                 uuid[1] = super->set_uuid1;
 380                 uuid[2] = super->set_uuid2;
 381                 uuid[3] = super->set_uuid3;
 382         } else {
 383                 uuid[1] = 0;
 384                 uuid[2] = 0;
 385                 uuid[3] = 0;
 386         }
 387 }
 388
 389 static void getinfo_super0(struct supertype *st, struct mdinfo *info, char *map)
 390 {
 391         mdp_super_t *sb = st->sb;
 392         int working = 0;
 393         int i;
 394         int map_disks = info->array.raid_disks;
 395
 396         memset(info, 0, sizeof(*info));
 397         info->array.major_version = sb->major_version;
 398         info->array.minor_version = sb->minor_version;
 399         info->array.patch_version = sb->patch_version;
 400         info->array.raid_disks = sb->raid_disks;
 401         info->array.level = sb->level;
 402         info->array.layout = sb->layout;
 403         info->array.md_minor = sb->md_minor;
 404         info->array.ctime = sb->ctime;
 405         info->array.utime = sb->utime;
 406         info->array.chunk_size = sb->chunk_size;
 407         info->array.state = sb->state;
 408         info->component_size = sb->size;
 409         info->component_size *= 2;
 410
 411         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
 412                 info->bitmap_offset = 8;
 413
 414         info->disk.state = sb->this_disk.state;
 415         info->disk.major = sb->this_disk.major;
 416         info->disk.minor = sb->this_disk.minor;
 417         info->disk.raid_disk = sb->this_disk.raid_disk;
 418         info->disk.number = sb->this_disk.number;
 419
 420         info->events = md_event(sb);
 421         info->data_offset = 0;
 422
 423         sprintf(info->text_version, "0.%d", sb->minor_version);
 424         info->safe_mode_delay = 200;
 425
 426         uuid_from_super0(st, info->uuid);
 427
 428         info->recovery_start = MaxSector;
 429         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 430                 info->reshape_active = 1;
 431                 info->reshape_progress = sb->reshape_position;
 432                 info->new_level = sb->new_level;
 433                 info->delta_disks = sb->delta_disks;
 434                 info->new_layout = sb->new_layout;
 435                 info->new_chunk = sb->new_chunk;
 436                 if (info->delta_disks < 0)
 437                         info->array.raid_disks -= info->delta_disks;
 438         } else
 439                 info->reshape_active = 0;
 440
 441         info->recovery_blocked = info->reshape_active;
 442
 443         sprintf(info->name, "%d", sb->md_minor);
 444         /* work_disks is calculated rather than read directly */
 445         for (i=0; i < MD_SB_DISKS; i++)
 446                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 447                     (sb->disks[i].raid_disk < (unsigned)info->array.raid_disks) &&
 448                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 449                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY))) {
 450                         working ++;
 451                         if (map && i < map_disks)
 452                                 map[i] = 1;
 453                 } else if (map && i < map_disks)
 454                         map[i] = 0;
 455         info->array.working_disks = working;
 456 }
 457
 458 static struct mdinfo *container_content0(struct supertype *st, char *subarray)
 459 {
 460         struct mdinfo *info;
 461
 462         if (subarray)
 463                 return NULL;
 464
 465         info = xmalloc(sizeof(*info));
 466         getinfo_super0(st, info, NULL);
 467         return info;
 468 }
 469
 470 static int update_super0(struct supertype *st, struct mdinfo *info,
 471                          char *update,
 472                          char *devname, int verbose,
 473                          int uuid_set, char *homehost)
 474 {
 475         /* NOTE: for 'assemble' and 'force' we need to return non-zero
 476          * if any change was made.  For others, the return value is
 477          * ignored.
 478          */
 479         int rv = 0;
 480         int uuid[4];
 481         mdp_super_t *sb = st->sb;
 482
 483         if (strcmp(update, "homehost") == 0 &&
 484             homehost) {
 485                 /* note that 'homehost' is special as it is really
 486                  * a "uuid" update.
 487                  */
 488                 uuid_set = 0;
 489                 update = "uuid";
 490                 info->uuid[0] = sb->set_uuid0;
 491                 info->uuid[1] = sb->set_uuid1;
 492         }
 493
 494         if (strcmp(update, "sparc2.2")==0 ) {
 495                 /* 2.2 sparc put the events in the wrong place
 496                  * So we copy the tail of the superblock
 497                  * up 4 bytes before continuing
 498                  */
 499                 __u32 *sb32 = (__u32*)sb;
 500                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 501                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 502                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 503                 if (verbose >= 0)
 504                         pr_err("adjusting superblock of %s for 2.2/sparc compatibility.\n",
 505                                devname);
 506         } else if (strcmp(update, "super-minor") ==0) {
 507                 sb->md_minor = info->array.md_minor;
 508                 if (verbose > 0)
 509                         pr_err("updating superblock of %s with minor number %d\n",
 510                                 devname, info->array.md_minor);
 511         } else if (strcmp(update, "summaries") == 0) {
 512                 unsigned int i;
 513                 /* set nr_disks, active_disks, working_disks,
 514                  * failed_disks, spare_disks based on disks[]
 515                  * array in superblock.
 516                  * Also make sure extra slots aren't 'failed'
 517                  */
 518                 sb->nr_disks = sb->active_disks =
 519                         sb->working_disks = sb->failed_disks =
 520                         sb->spare_disks = 0;
 521                 for (i=0; i < MD_SB_DISKS ; i++)
 522                         if (sb->disks[i].major ||
 523                             sb->disks[i].minor) {
 524                                 int state = sb->disks[i].state;
 525                                 if (state & (1<<MD_DISK_REMOVED))
 526                                         continue;
 527                                 sb->nr_disks++;
 528                                 if (state & (1<<MD_DISK_ACTIVE))
 529                                         sb->active_disks++;
 530                                 if (state & (1<<MD_DISK_FAULTY))
 531                                         sb->failed_disks++;
 532                                 else
 533                                         sb->working_disks++;
 534                                 if (state == 0)
 535                                         sb->spare_disks++;
 536                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 537                                 sb->disks[i].state = 0;
 538         } else if (strcmp(update, "force-one")==0) {
 539                 /* Not enough devices for a working array, so
 540                  * bring this one up-to-date.
 541                  */
 542                 __u32 ehi = sb->events_hi, elo = sb->events_lo;
 543                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 544                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 545                 if (sb->events_hi != ehi ||
 546                     sb->events_lo != elo)
 547                         rv = 1;
 548         } else if (strcmp(update, "force-array")==0) {
 549                 /* degraded array and 'force' requested, so
 550                  * maybe need to mark it 'clean'
 551                  */
 552                 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
 553                     (sb->state & (1 << MD_SB_CLEAN)) == 0) {
 554                         /* need to force clean */
 555                         sb->state |= (1 << MD_SB_CLEAN);
 556                         rv = 1;
 557                 }
 558         } else if (strcmp(update, "assemble")==0) {
 559                 int d = info->disk.number;
 560                 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
 561                 int mask = (1<<MD_DISK_WRITEMOSTLY);
 562                 int add = 0;
 563                 if (sb->minor_version >= 91)
 564                         /* During reshape we don't insist on everything
 565                          * being marked 'sync'
 566                          */
 567                         add = (1<<MD_DISK_SYNC);
 568                 if (((sb->disks[d].state & ~mask) | add)
 569                     != (unsigned)info->disk.state) {
 570                         sb->disks[d].state = info->disk.state | wonly;
 571                         rv = 1;
 572                 }
 573                 if (info->reshape_active &&
 574                     sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
 575                     info->delta_disks >= 0 &&
 576                     info->reshape_progress < sb->reshape_position) {
 577                         sb->reshape_position = info->reshape_progress;
 578                         rv = 1;
 579                 }
 580                 if (info->reshape_active &&
 581                     sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
 582                     info->delta_disks < 0 &&
 583                     info->reshape_progress > sb->reshape_position) {
 584                         sb->reshape_position = info->reshape_progress;
 585                         rv = 1;
 586                 }
 587         } else if (strcmp(update, "linear-grow-new") == 0) {
 588                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 589                 sb->disks[info->disk.number].number = info->disk.number;
 590                 sb->disks[info->disk.number].major = info->disk.major;
 591                 sb->disks[info->disk.number].minor = info->disk.minor;
 592                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 593                 sb->disks[info->disk.number].state = info->disk.state;
 594                 sb->this_disk = sb->disks[info->disk.number];
 595         } else if (strcmp(update, "linear-grow-update") == 0) {
 596                 sb->raid_disks = info->array.raid_disks;
 597                 sb->nr_disks = info->array.nr_disks;
 598                 sb->active_disks = info->array.active_disks;
 599                 sb->working_disks = info->array.working_disks;
 600                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 601                 sb->disks[info->disk.number].number = info->disk.number;
 602                 sb->disks[info->disk.number].major = info->disk.major;
 603                 sb->disks[info->disk.number].minor = info->disk.minor;
 604                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 605                 sb->disks[info->disk.number].state = info->disk.state;
 606         } else if (strcmp(update, "resync") == 0) {
 607                 /* make sure resync happens */
 608                 sb->state &= ~(1<<MD_SB_CLEAN);
 609                 sb->recovery_cp = 0;
 610         } else if (strcmp(update, "uuid") == 0) {
 611                 if (!uuid_set && homehost) {
 612                         char buf[20];
 613                         char *hash = sha1_buffer(homehost,
 614                                                  strlen(homehost),
 615                                                  buf);
 616                         memcpy(info->uuid+2, hash, 8);
 617                 }
 618                 sb->set_uuid0 = info->uuid[0];
 619                 sb->set_uuid1 = info->uuid[1];
 620                 sb->set_uuid2 = info->uuid[2];
 621                 sb->set_uuid3 = info->uuid[3];
 622                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
 623                         struct bitmap_super_s *bm;
 624                         bm = (struct bitmap_super_s*)(sb+1);
 625                         uuid_from_super0(st, uuid);
 626                         memcpy(bm->uuid, uuid, 16);
 627                 }
 628         } else if (strcmp(update, "metadata") == 0) {
 629                 /* Create some v1.0 metadata to match ours but make the
 630                  * ctime bigger.  Also update info->array.*_version.
 631                  * We need to arrange that store_super writes out
 632                  * the v1.0 metadata.
 633                  * Not permitted for unclean array, or array with
 634                  * bitmap.
 635                  */
 636                 if (info->bitmap_offset) {
 637                         pr_err("Cannot update metadata when bitmap is present\n");
 638                         rv = -2;
 639                 } else if (info->array.state != 1) {
 640                         pr_err("Cannot update metadata on unclean array\n");
 641                         rv = -2;
 642                 } else {
 643                         info->array.major_version = 1;
 644                         info->array.minor_version = 0;
 645                         uuid_from_super0(st, info->uuid);
 646                         st->other = super1_make_v0(st, info, st->sb);
 647                 }
 648         } else if (strcmp(update, "revert-reshape") == 0) {
 649                 rv = -2;
 650                 if (sb->minor_version <= 90)
 651                         pr_err("No active reshape to revert on %s\n",
 652                                devname);
 653                 else if (sb->delta_disks == 0)
 654                         pr_err("%s: Can only revert reshape which changes number of devices\n",
 655                                devname);
 656                 else {
 657                         int tmp;
 658                         int parity = sb->level == 6 ? 2 : 1;
 659                         rv = 0;
 660
 661                         if (sb->level >= 4 && sb->level <= 6 &&
 662                             sb->reshape_position % (
 663                                     sb->new_chunk/512 *
 664                                     (sb->raid_disks - sb->delta_disks - parity))) {
 665                                 pr_err("Reshape position is not suitably aligned.\n");
 666                                 pr_err("Try normal assembly and stop again\n");
 667                                 return -2;
 668                         }
 669                         sb->raid_disks -= sb->delta_disks;
 670                         sb->delta_disks = -sb->delta_disks;
 671
 672                         tmp = sb->new_layout;
 673                         sb->new_layout = sb->layout;
 674                         sb->layout = tmp;
 675
 676                         tmp = sb->new_chunk;
 677                         sb->new_chunk = sb->chunk_size;
 678                         sb->chunk_size = tmp;
 679                 }
 680         } else if (strcmp(update, "no-bitmap") == 0) {
 681                 sb->state &= ~(1<<MD_SB_BITMAP_PRESENT);
 682         } else if (strcmp(update, "_reshape_progress")==0)
 683                 sb->reshape_position = info->reshape_progress;
 684         else if (strcmp(update, "writemostly")==0)
 685                 sb->state |= (1<<MD_DISK_WRITEMOSTLY);
 686         else if (strcmp(update, "readwrite")==0)
 687                 sb->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 688         else
 689                 rv = -1;
 690
 691         sb->sb_csum = calc_sb0_csum(sb);
 692         return rv;
 693 }
 694
 695 /*
 696  * For verion-0 superblock, the homehost is 'stored' in the
 697  * uuid.  8 bytes for a hash of the host leaving 8 bytes
 698  * of random material.
 699  * We use the first 8 bytes (64bits) of the sha1 of the
 700  * host name
 701  */
 702
 703 static int init_super0(struct supertype *st, mdu_array_info_t *info,
 704                        unsigned long long size, char *ignored_name, char *homehost,
 705                        int *uuid, unsigned long long data_offset)
 706 {
 707         mdp_super_t *sb;
 708         int spares;
 709
 710         if (data_offset != INVALID_SECTORS) {
 711                 pr_err("data-offset not support for 0.90\n");
 712                 return 0;
 713         }
 714
 715         if (posix_memalign((void**)&sb, 4096,
 716                            MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
 717                 pr_err("could not allocate superblock\n");
 718                 return 0;
 719         }
 720         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 721
 722         st->sb = sb;
 723         if (info == NULL) {
 724                 /* zeroing the superblock */
 725                 return 0;
 726         }
 727
 728         spares = info->working_disks - info->active_disks;
 729         if (info->raid_disks + spares  > MD_SB_DISKS) {
 730                 pr_err("too many devices requested: %d+%d > %d\n",
 731                         info->raid_disks , spares, MD_SB_DISKS);
 732                 return 0;
 733         }
 734
 735         sb->md_magic = MD_SB_MAGIC;
 736         sb->major_version = 0;
 737         sb->minor_version = 90;
 738         sb->patch_version = 0;
 739         sb->gvalid_words = 0; /* ignored */
 740         sb->ctime = time(0);
 741         sb->level = info->level;
 742         sb->size = size;
 743         if (size != (unsigned long long)sb->size)
 744                 return 0;
 745         sb->nr_disks = info->nr_disks;
 746         sb->raid_disks = info->raid_disks;
 747         sb->md_minor = info->md_minor;
 748         sb->not_persistent = 0;
 749         if (uuid) {
 750                 sb->set_uuid0 = uuid[0];
 751                 sb->set_uuid1 = uuid[1];
 752                 sb->set_uuid2 = uuid[2];
 753                 sb->set_uuid3 = uuid[3];
 754         } else {
 755                 int rfd = open("/dev/urandom", O_RDONLY);
 756                 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 757                         sb->set_uuid0 = random();
 758                 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 759                         sb->set_uuid1 = random();
 760                         sb->set_uuid2 = random();
 761                         sb->set_uuid3 = random();
 762                 }
 763                 if (rfd >= 0)
 764                         close(rfd);
 765         }
 766         if (homehost && !uuid) {
 767                 char buf[20];
 768                 char *hash = sha1_buffer(homehost,
 769                                          strlen(homehost),
 770                                          buf);
 771                 memcpy(&sb->set_uuid2, hash, 8);
 772         }
 773
 774         sb->utime = sb->ctime;
 775         sb->state = info->state;
 776         sb->active_disks = info->active_disks;
 777         sb->working_disks = info->working_disks;
 778         sb->failed_disks = info->failed_disks;
 779         sb->spare_disks = info->spare_disks;
 780         sb->events_hi = 0;
 781         sb->events_lo = 1;
 782
 783         sb->layout = info->layout;
 784         sb->chunk_size = info->chunk_size;
 785
 786         return 1;
 787 }
 788
 789 struct devinfo {
 790         int fd;
 791         char *devname;
 792         mdu_disk_info_t disk;
 793         struct devinfo *next;
 794 };
 795
 796 #ifndef MDASSEMBLE
 797 /* Add a device to the superblock being created */
 798 static int add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
 799                          int fd, char *devname, unsigned long long data_offset)
 800 {
 801         mdp_super_t *sb = st->sb;
 802         mdp_disk_t *dk = &sb->disks[dinfo->number];
 803         struct devinfo *di, **dip;
 804
 805         dk->number = dinfo->number;
 806         dk->major = dinfo->major;
 807         dk->minor = dinfo->minor;
 808         dk->raid_disk = dinfo->raid_disk;
 809         dk->state = dinfo->state & ((1<<MD_DISK_ACTIVE) |
 810                                     (1<<MD_DISK_SYNC));
 811
 812         sb->this_disk = sb->disks[dinfo->number];
 813         sb->sb_csum = calc_sb0_csum(sb);
 814
 815         dip = (struct devinfo **)&st->info;
 816         while (*dip)
 817                 dip = &(*dip)->next;
 818         di = xmalloc(sizeof(struct devinfo));
 819         di->fd = fd;
 820         di->devname = devname;
 821         di->disk = *dinfo;
 822         di->next = NULL;
 823         *dip = di;
 824
 825         return 0;
 826 }
 827 #endif
 828
 829 static int store_super0(struct supertype *st, int fd)
 830 {
 831         unsigned long long dsize;
 832         unsigned long long offset;
 833         mdp_super_t *super = st->sb;
 834
 835         if (!get_dev_size(fd, NULL, &dsize))
 836                 return 1;
 837
 838         if (dsize < MD_RESERVED_SECTORS*512)
 839                 return 2;
 840
 841         if (st->other) {
 842                 /* Writing out v1.0 metadata for --update=metadata */
 843                 int ret = 0;
 844
 845                 offset = dsize/512 - 8*2;
 846                 offset &= ~(4*2-1);
 847                 offset *= 512;
 848                 if (lseek64(fd, offset, 0)< 0LL)
 849                         ret = 3;
 850                 else if (write(fd, st->other, 1024) != 1024)
 851                         ret = 4;
 852                 else
 853                         fsync(fd);
 854                 free(st->other);
 855                 st->other = NULL;
 856                 return ret;
 857         }
 858
 859         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 860
 861         offset *= 512;
 862
 863         if (lseek64(fd, offset, 0)< 0LL)
 864                 return 3;
 865
 866         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 867                 return 4;
 868
 869         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 870                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 871                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
 872                         if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
 873                             ROUND_UP(sizeof(*bm),4096))
 874                             return 5;
 875         }
 876
 877         fsync(fd);
 878         return 0;
 879 }
 880
 881 #ifndef MDASSEMBLE
 882 static int write_init_super0(struct supertype *st)
 883 {
 884         mdp_super_t *sb = st->sb;
 885         int rv = 0;
 886         struct devinfo *di;
 887
 888         for (di = st->info ; di && ! rv ; di = di->next) {
 889
 890                 if (di->disk.state & (1 << MD_DISK_FAULTY))
 891                         continue;
 892                 if (di->fd == -1)
 893                         continue;
 894                 while (Kill(di->devname, NULL, 0, -1, 1) == 0)
 895                         ;
 896
 897                 sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
 898
 899                 sb->this_disk = sb->disks[di->disk.number];
 900                 sb->sb_csum = calc_sb0_csum(sb);
 901                 rv = store_super0(st, di->fd);
 902
 903                 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 904                         rv = st->ss->write_bitmap(st, di->fd, NoUpdate);
 905
 906                 if (rv)
 907                         pr_err("failed to write superblock to %s\n",
 908                                di->devname);
 909         }
 910         return rv;
 911 }
 912 #endif
 913
 914 static int compare_super0(struct supertype *st, struct supertype *tst)
 915 {
 916         /*
 917          * return:
 918          *  0 same, or first was empty, and second was copied
 919          *  1 second had wrong number
 920          *  2 wrong uuid
 921          *  3 wrong other info
 922          */
 923         mdp_super_t *first = st->sb;
 924         mdp_super_t *second = tst->sb;
 925         int uuid1[4], uuid2[4];
 926
 927         if (second->md_magic != MD_SB_MAGIC)
 928                 return 1;
 929         if (!first) {
 930                 if (posix_memalign((void**)&first, 4096,
 931                              MD_SB_BYTES +
 932                              ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
 933                         pr_err("could not allocate superblock\n");
 934                         return 1;
 935                 }
 936                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 937                 st->sb = first;
 938                 return 0;
 939         }
 940
 941         uuid_from_super0(st, uuid1);
 942         uuid_from_super0(tst, uuid2);
 943         if (!same_uuid(uuid1, uuid2, 0))
 944                 return 2;
 945         if (first->major_version != second->major_version ||
 946             first->minor_version != second->minor_version ||
 947             first->patch_version != second->patch_version ||
 948             first->gvalid_words  != second->gvalid_words  ||
 949             first->ctime         != second->ctime         ||
 950             first->level         != second->level         ||
 951             first->size          != second->size          ||
 952             first->raid_disks    != second->raid_disks    )
 953                 return 3;
 954
 955         return 0;
 956 }
 957
 958 static void free_super0(struct supertype *st);
 959
 960 static int load_super0(struct supertype *st, int fd, char *devname)
 961 {
 962         /* try to read in the superblock
 963          * Return:
 964          *  0 on success
 965          *  1 on cannot get superblock
 966          *  2 on superblock meaningless
 967          */
 968         unsigned long long dsize;
 969         unsigned long long offset;
 970         mdp_super_t *super;
 971         int uuid[4];
 972         struct bitmap_super_s *bsb;
 973
 974         free_super0(st);
 975
 976         if (!get_dev_size(fd, devname, &dsize))
 977                 return 1;
 978
 979         if (dsize < MD_RESERVED_SECTORS*512) {
 980                 if (devname)
 981                         pr_err("%s is too small for md: size is %llu sectors.\n",
 982                                devname, dsize);
 983                 return 1;
 984         }
 985         st->devsize = dsize;
 986
 987         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 988
 989         offset *= 512;
 990
 991         if (lseek64(fd, offset, 0)< 0LL) {
 992                 if (devname)
 993                         pr_err("Cannot seek to superblock on %s: %s\n",
 994                                 devname, strerror(errno));
 995                 return 1;
 996         }
 997
 998         if (posix_memalign((void**)&super, 4096,
 999                            MD_SB_BYTES +
1000                            ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
1001                 pr_err("could not allocate superblock\n");
1002                 return 1;
1003         }
1004
1005         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
1006                 if (devname)
1007                         pr_err("Cannot read superblock on %s\n",
1008                                 devname);
1009                 free(super);
1010                 return 1;
1011         }
1012
1013         if (st->ss && st->minor_version == 9)
1014                 super0_swap_endian(super);
1015
1016         if (super->md_magic != MD_SB_MAGIC) {
1017                 if (devname)
1018                         pr_err("No super block found on %s (Expected magic %08x, got %08x)\n",
1019                                 devname, MD_SB_MAGIC, super->md_magic);
1020                 free(super);
1021                 return 2;
1022         }
1023
1024         if (super->major_version != 0) {
1025                 if (devname)
1026                         pr_err("Cannot interpret superblock on %s - version is %d\n",
1027                                 devname, super->major_version);
1028                 free(super);
1029                 return 2;
1030         }
1031         st->sb = super;
1032
1033         if (st->ss == NULL) {
1034                 st->ss = &super0;
1035                 st->minor_version = super->minor_version;
1036                 st->max_devs = MD_SB_DISKS;
1037                 st->info = NULL;
1038         }
1039
1040         /* Now check on the bitmap superblock */
1041         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
1042                 return 0;
1043         /* Read the bitmap superblock and make sure it looks
1044          * valid.  If it doesn't clear the bit.  An --assemble --force
1045          * should get that written out.
1046          */
1047         if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096))
1048             != ROUND_UP(sizeof(struct bitmap_super_s),4096))
1049                 goto no_bitmap;
1050
1051         uuid_from_super0(st, uuid);
1052         bsb = (struct bitmap_super_s *)(super+1);
1053         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1054             memcmp(bsb->uuid, uuid, 16) != 0)
1055                 goto no_bitmap;
1056         return 0;
1057
1058  no_bitmap:
1059         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
1060
1061         return 0;
1062 }
1063
1064 static struct supertype *match_metadata_desc0(char *arg)
1065 {
1066         struct supertype *st = xcalloc(1, sizeof(*st));
1067
1068         st->container_devnm[0] = 0;
1069         st->ss = &super0;
1070         st->info = NULL;
1071         st->minor_version = 90;
1072         st->max_devs = MD_SB_DISKS;
1073         st->sb = NULL;
1074         /* we sometimes get 00.90 */
1075         while (arg[0] == '0' && arg[1] == '0')
1076                 arg++;
1077         if (strcmp(arg, "0") == 0 ||
1078 #ifdef DEFAULT_OLD_METADATA /* ifndef in super1.c */
1079             strcmp(arg, "default") == 0 ||
1080 #endif /* DEFAULT_OLD_METADATA */
1081             strcmp(arg, "0.90") == 0 ||
1082             strcmp(arg, "") == 0 /* no metadata  - i.e. non_persistent */
1083                 )
1084                 return st;
1085
1086         st->minor_version = 91; /* reshape in progress */
1087         if (strcmp(arg, "0.91") == 0) /* For dup_super support */
1088                 return st;
1089
1090         st->minor_version = 9; /* flag for 'byte-swapped' */
1091         if (strcmp(arg, "0.swap")==0 ||
1092             strcmp(arg, "0.9") == 0) /* For dup_super support */
1093                 return st;
1094
1095         free(st);
1096         return NULL;
1097 }
1098
1099 static __u64 avail_size0(struct supertype *st, __u64 devsize,
1100                          unsigned long long data_offset)
1101 {
1102         if (data_offset != 0 && data_offset != INVALID_SECTORS)
1103                 return 0ULL;
1104         if (devsize < MD_RESERVED_SECTORS)
1105                 return 0ULL;
1106         return MD_NEW_SIZE_SECTORS(devsize);
1107 }
1108
1109 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
1110                                 int delay, int write_behind,
1111                                 unsigned long long size, int may_change,
1112                                 int major)
1113 {
1114         /*
1115          * The bitmap comes immediately after the superblock and must be 60K in size
1116          * at most.  The default size is between 30K and 60K
1117          *
1118          * size is in sectors,  chunk is in bytes !!!
1119          */
1120         unsigned long long bits;
1121         unsigned long long max_bits = (60*1024 - sizeof(bitmap_super_t))*8;
1122         unsigned long long min_chunk;
1123         int chunk = *chunkp;
1124         mdp_super_t *sb = st->sb;
1125         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
1126         int uuid[4];
1127
1128         min_chunk = 4096; /* sub-page chunks don't work yet.. */
1129         bits = (size * 512) / min_chunk + 1;
1130         while (bits > max_bits) {
1131                 min_chunk *= 2;
1132                 bits = (bits+1)/2;
1133         }
1134         if (chunk == UnSet) {
1135                 /* A chunk size less than a few Megabytes gives poor
1136                  * performance without increasing resync noticeably
1137                  */
1138                 chunk = min_chunk;
1139                 if (chunk < 64*1024*1024)
1140                         chunk = 64*1024*1024;
1141         } else if ((unsigned long long)chunk < min_chunk)
1142                 return -EINVAL; /* chunk size too small */
1143
1144         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1145
1146         memset(bms, 0, sizeof(*bms));
1147         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1148         bms->version = __cpu_to_le32(major);
1149         uuid_from_super0(st, uuid);
1150         memcpy(bms->uuid, uuid, 16);
1151         bms->chunksize = __cpu_to_le32(chunk);
1152         bms->daemon_sleep = __cpu_to_le32(delay);
1153         bms->sync_size = __cpu_to_le64(size);
1154         bms->write_behind = __cpu_to_le32(write_behind);
1155         *chunkp = chunk;
1156         return 0;
1157 }
1158
1159 static int locate_bitmap0(struct supertype *st, int fd, int node_num)
1160 {
1161         unsigned long long dsize;
1162         unsigned long long offset;
1163
1164         if (!get_dev_size(fd, NULL, &dsize))
1165                 return -1;
1166
1167         if (dsize < MD_RESERVED_SECTORS*512)
1168                 return -1;
1169
1170         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1171
1172         offset *= 512;
1173
1174         offset += MD_SB_BYTES;
1175
1176         lseek64(fd, offset, 0);
1177         return 0;
1178 }
1179
1180 static int write_bitmap0(struct supertype *st, int fd, enum bitmap_update update)
1181 {
1182         unsigned long long dsize;
1183         unsigned long long offset;
1184         mdp_super_t *sb = st->sb;
1185
1186         int rv = 0;
1187
1188         int towrite, n;
1189         void *buf;
1190
1191         if (!get_dev_size(fd, NULL, &dsize))
1192                 return 1;
1193
1194         if (dsize < MD_RESERVED_SECTORS*512)
1195                 return -1;
1196
1197         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1198
1199         offset *= 512;
1200
1201         if (lseek64(fd, offset + 4096, 0)< 0LL)
1202                 return 3;
1203
1204         if (posix_memalign(&buf, 4096, 4096))
1205                 return -ENOMEM;
1206
1207         memset(buf, 0xff, 4096);
1208         memcpy(buf,  ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
1209         towrite = 60*1024;
1210         while (towrite > 0) {
1211                 n = towrite;
1212                 if (n > 4096)
1213                         n = 4096;
1214                 n = write(fd, buf, n);
1215                 if (n > 0)
1216                         towrite -= n;
1217                 else
1218                         break;
1219                 memset(buf, 0xff, 4096);
1220         }
1221         fsync(fd);
1222         if (towrite)
1223                 rv = -2;
1224
1225         free(buf);
1226         return rv;
1227 }
1228
1229 static void free_super0(struct supertype *st)
1230 {
1231         if (st->sb)
1232                 free(st->sb);
1233         while (st->info) {
1234                 struct devinfo *di = st->info;
1235                 st->info = di->next;
1236                 if (di->fd >= 0)
1237                         close(di->fd);
1238                 free(di);
1239         }
1240         st->sb = NULL;
1241 }
1242
1243 #ifndef MDASSEMBLE
1244 static int validate_geometry0(struct supertype *st, int level,
1245                               int layout, int raiddisks,
1246                               int *chunk, unsigned long long size,
1247                               unsigned long long data_offset,
1248                               char *subdev, unsigned long long *freesize,
1249                               int verbose)
1250 {
1251         unsigned long long ldsize;
1252         int fd;
1253         unsigned int tbmax = 4;
1254
1255         /* prior to linux 3.1, a but limits usable device size to 2TB.
1256          * It was introduced in 2.6.29, but we won't worry about that detail
1257          */
1258         if (get_linux_version() < 3001000)
1259                 tbmax = 2;
1260
1261         if (level == LEVEL_CONTAINER) {
1262                 if (verbose)
1263                         pr_err("0.90 metadata does not support containers\n");
1264                 return 0;
1265         }
1266         if (raiddisks > MD_SB_DISKS) {
1267                 if (verbose)
1268                         pr_err("0.90 metadata supports at most %d devices per array\n",
1269                                 MD_SB_DISKS);
1270                 return 0;
1271         }
1272         if (size >= tbmax * 2ULL*1024*1024*1024) {
1273                 if (verbose)
1274                         pr_err("0.90 metadata supports at most %d terabytes per device\n", tbmax);
1275                 return 0;
1276         }
1277         if (*chunk == UnSet)
1278                 *chunk = DEFAULT_CHUNK;
1279
1280         if (!subdev)
1281                 return 1;
1282
1283         fd = open(subdev, O_RDONLY|O_EXCL, 0);
1284         if (fd < 0) {
1285                 if (verbose)
1286                         pr_err("super0.90 cannot open %s: %s\n",
1287                                 subdev, strerror(errno));
1288                 return 0;
1289         }
1290
1291         if (!get_dev_size(fd, subdev, &ldsize)) {
1292                 close(fd);
1293                 return 0;
1294         }
1295         close(fd);
1296
1297         if (ldsize < MD_RESERVED_SECTORS * 512)
1298                 return 0;
1299         *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
1300         return 1;
1301 }
1302 #endif /* MDASSEMBLE */
1303
1304 struct superswitch super0 = {
1305 #ifndef MDASSEMBLE
1306         .examine_super = examine_super0,
1307         .brief_examine_super = brief_examine_super0,
1308         .export_examine_super = export_examine_super0,
1309         .detail_super = detail_super0,
1310         .brief_detail_super = brief_detail_super0,
1311         .write_init_super = write_init_super0,
1312         .validate_geometry = validate_geometry0,
1313         .add_to_super = add_to_super0,
1314         .copy_metadata = copy_metadata0,
1315 #endif
1316         .match_home = match_home0,
1317         .uuid_from_super = uuid_from_super0,
1318         .getinfo_super = getinfo_super0,
1319         .container_content = container_content0,
1320         .update_super = update_super0,
1321         .init_super = init_super0,
1322         .store_super = store_super0,
1323         .compare_super = compare_super0,
1324         .load_super = load_super0,
1325         .match_metadata_desc = match_metadata_desc0,
1326         .avail_size = avail_size0,
1327         .add_internal_bitmap = add_internal_bitmap0,
1328         .locate_bitmap = locate_bitmap0,
1329         .write_bitmap = write_bitmap0,
1330         .free_super = free_super0,
1331         .name = "0.90",
1332 };