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",
  91                sb->major_version, sb->minor_version, sb->patch_version);
  92         if (sb->minor_version >= 90) {
  93                 printf("           UUID : %08x:%08x:%08x:%08x", sb->set_uuid0,
  94                        sb->set_uuid1, sb->set_uuid2, sb->set_uuid3);
  95                 if (homehost) {
  96                         char buf[20];
  97                         void *hash;
  98
  99                         hash = sha1_buffer(homehost, strlen(homehost), 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:
 120                         ddsks=1;
 121                         break;
 122                 case 4:
 123                 case 5:
 124                         ddsks = sb->raid_disks - 1;
 125                         break;
 126                 case 6:
 127                         ddsks = sb->raid_disks - 2;
 128                         break;
 129                 case 10:
 130                         ddsks = sb->raid_disks;
 131                         ddsks_denom =
 132                                 (sb->layout & 255) * ((sb->layout >> 8) & 255);
 133                 }
 134                 if (ddsks) {
 135                         long long asize = sb->size;
 136                         asize = (asize << 10) * ddsks / ddsks_denom;
 137                         printf("     Array Size : %llu%s\n",
 138                                asize >> 10,  human_size(asize));
 139                 }
 140         }
 141         printf("   Raid Devices : %d\n", sb->raid_disks);
 142         printf("  Total Devices : %d\n", sb->nr_disks);
 143         printf("Preferred Minor : %d\n", sb->md_minor);
 144         printf("\n");
 145         if (sb->minor_version > 90 && (sb->reshape_position + 1) != 0) {
 146                 printf("  Reshape pos'n : %llu%s\n",
 147                        (unsigned long long)sb->reshape_position / 2,
 148                        human_size((long long)sb->reshape_position << 9));
 149                 if (sb->delta_disks) {
 150                         printf("  Delta Devices : %d", sb->delta_disks);
 151                         printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks,
 152                                sb->raid_disks);
 153                         if (((int)sb->delta_disks) < 0)
 154                                 delta_extra = - sb->delta_disks;
 155                 }
 156                 if (sb->new_level != sb->level) {
 157                         c = map_num(pers, sb->new_level);
 158                         printf("      New Level : %s\n", c?c:"-unknown-");
 159                 }
 160                 if (sb->new_layout != sb->layout) {
 161                         if (sb->level == 5) {
 162                                 c = map_num(r5layout, sb->new_layout);
 163                                 printf("     New Layout : %s\n",
 164                                        c?c:"-unknown-");
 165                         }
 166                         if (sb->level == 6) {
 167                                 c = map_num(r6layout, sb->new_layout);
 168                                 printf("     New Layout : %s\n",
 169                                        c?c:"-unknown-");
 170                         }
 171                         if (sb->level == 10) {
 172                                 printf("     New Layout : near=%d, %s=%d\n",
 173                                        sb->new_layout&255,
 174                                        (sb->new_layout&0x10000)?"offset":"far",
 175                                        (sb->new_layout>>8)&255);
 176                         }
 177                 }
 178                 if (sb->new_chunk != sb->chunk_size)
 179                         printf("  New Chunksize : %d\n", sb->new_chunk);
 180                 printf("\n");
 181         }
 182         atime = sb->utime;
 183         printf("    Update Time : %.24s\n", ctime(&atime));
 184         printf("          State : %s\n",
 185                (sb->state&(1 << MD_SB_CLEAN)) ? "clean":"active");
 186         if (sb->state & (1 << MD_SB_BITMAP_PRESENT))
 187                 printf("Internal Bitmap : present\n");
 188         printf(" Active Devices : %d\n", sb->active_disks);
 189         printf("Working Devices : %d\n", sb->working_disks);
 190         printf(" Failed Devices : %d\n", sb->failed_disks);
 191         printf("  Spare Devices : %d\n", sb->spare_disks);
 192         if (calc_sb0_csum(sb) == sb->sb_csum)
 193                 printf("       Checksum : %x - correct\n", sb->sb_csum);
 194         else
 195                 printf("       Checksum : %x - expected %lx\n",
 196                        sb->sb_csum, calc_sb0_csum(sb));
 197         printf("         Events : %llu\n",
 198                ((unsigned long long)sb->events_hi << 32) + sb->events_lo);
 199         printf("\n");
 200         if (sb->level == 5) {
 201                 c = map_num(r5layout, sb->layout);
 202                 printf("         Layout : %s\n", c?c:"-unknown-");
 203         }
 204         if (sb->level == 6) {
 205                 c = map_num(r6layout, sb->layout);
 206                 printf("         Layout : %s\n", c?c:"-unknown-");
 207         }
 208         if (sb->level == 10) {
 209                 printf("         Layout :");
 210                 print_r10_layout(sb->layout);
 211                 printf("\n");
 212         }
 213         switch(sb->level) {
 214         case 0:
 215         case 4:
 216         case 5:
 217         case 6:
 218         case 10:
 219                 printf("     Chunk Size : %dK\n", sb->chunk_size / 1024);
 220                 break;
 221         case -1:
 222                 printf("       Rounding : %dK\n", sb->chunk_size / 1024);
 223                 break;
 224         default:
 225                 break;
 226         }
 227         printf("\n");
 228         printf("      Number   Major   Minor   RaidDevice State\n");
 229         for (d = -1;
 230              d < (signed int)(sb->raid_disks + delta_extra + sb->spare_disks);
 231              d++) {
 232                 mdp_disk_t *dp;
 233                 char *dv;
 234                 char nb[5];
 235                 int wonly, failfast;
 236                 if (d>=0) dp = &sb->disks[d];
 237                 else dp = &sb->this_disk;
 238                 snprintf(nb, sizeof(nb), "%4d", d);
 239                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" : nb,
 240                        dp->number, dp->major, dp->minor, dp->raid_disk);
 241                 wonly = dp->state & (1 << MD_DISK_WRITEMOSTLY);
 242                 failfast = dp->state & (1<<MD_DISK_FAILFAST);
 243                 dp->state &= ~(wonly | failfast);
 244                 if (dp->state & (1 << MD_DISK_FAULTY))
 245                         printf(" faulty");
 246                 if (dp->state & (1 << MD_DISK_ACTIVE))
 247                         printf(" active");
 248                 if (dp->state & (1 << MD_DISK_SYNC))
 249                         printf(" sync");
 250                 if (dp->state & (1 << MD_DISK_REMOVED))
 251                         printf(" removed");
 252                 if (wonly)
 253                         printf(" write-mostly");
 254                 if (failfast)
 255                         printf(" failfast");
 256                 if (dp->state == 0)
 257                         printf(" spare");
 258                 if ((dv = map_dev(dp->major, dp->minor, 0)))
 259                         printf("   %s", dv);
 260                 printf("\n");
 261                 if (d == -1)
 262                         printf("\n");
 263         }
 264 }
 265
 266 static void brief_examine_super0(struct supertype *st, int verbose)
 267 {
 268         mdp_super_t *sb = st->sb;
 269         char *c=map_num(pers, sb->level);
 270         char devname[20];
 271
 272         sprintf(devname, "/dev/md%d", sb->md_minor);
 273
 274         if (verbose) {
 275                 printf("ARRAY %s level=%s num-devices=%d",
 276                        devname,
 277                        c?c:"-unknown-", sb->raid_disks);
 278         } else
 279                 printf("ARRAY %s", devname);
 280
 281         if (sb->minor_version >= 90)
 282                 printf(" UUID=%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 283                        sb->set_uuid2, sb->set_uuid3);
 284         else
 285                 printf(" UUID=%08x", sb->set_uuid0);
 286         printf("\n");
 287 }
 288
 289 static void export_examine_super0(struct supertype *st)
 290 {
 291         mdp_super_t *sb = st->sb;
 292
 293         printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
 294         printf("MD_DEVICES=%d\n", sb->raid_disks);
 295         if (sb->minor_version >= 90)
 296                 printf("MD_UUID=%08x:%08x:%08x:%08x\n",
 297                        sb->set_uuid0, sb->set_uuid1,
 298                        sb->set_uuid2, sb->set_uuid3);
 299         else
 300                 printf("MD_UUID=%08x\n", sb->set_uuid0);
 301         printf("MD_UPDATE_TIME=%llu\n",
 302                __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
 303         printf("MD_EVENTS=%llu\n",
 304                ((unsigned long long)sb->events_hi << 32)
 305                + sb->events_lo);
 306 }
 307
 308 static int copy_metadata0(struct supertype *st, int from, int to)
 309 {
 310         /* Read 64K from the appropriate offset of 'from'
 311          * and if it looks a little like a 0.90 superblock,
 312          * write it to the same offset of 'to'
 313          */
 314         void *buf;
 315         unsigned long long dsize, offset;
 316         const int bufsize = 64*1024;
 317         mdp_super_t *super;
 318
 319         if (posix_memalign(&buf, 4096, bufsize) != 0)
 320                 return 1;
 321
 322         if (!get_dev_size(from, NULL, &dsize))
 323                 goto err;
 324
 325         if (dsize < MD_RESERVED_SECTORS*512)
 326                 goto err;
 327
 328         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 329
 330         offset *= 512;
 331
 332         if (lseek64(from, offset, 0) < 0LL)
 333                 goto err;
 334         if (read(from, buf, bufsize) != bufsize)
 335                 goto err;
 336
 337         if (lseek64(to, offset, 0) < 0LL)
 338                 goto err;
 339         super = buf;
 340         if (super->md_magic != MD_SB_MAGIC ||
 341             super->major_version != 0 ||
 342             calc_sb0_csum(super) != super->sb_csum)
 343                 goto err;
 344         if (write(to, buf, bufsize) != bufsize)
 345                 goto err;
 346         free(buf);
 347         return 0;
 348 err:
 349         free(buf);
 350         return 1;
 351 }
 352
 353 static void detail_super0(struct supertype *st, char *homehost)
 354 {
 355         mdp_super_t *sb = st->sb;
 356         printf("           UUID : ");
 357         if (sb->minor_version >= 90)
 358                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 359                        sb->set_uuid2, sb->set_uuid3);
 360         else
 361                 printf("%08x", sb->set_uuid0);
 362         if (homehost) {
 363                 char buf[20];
 364                 void *hash = sha1_buffer(homehost,
 365                                          strlen(homehost),
 366                                          buf);
 367                 if (memcmp(&sb->set_uuid2, hash, 8)==0)
 368                         printf(" (local to host %s)", homehost);
 369         }
 370         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 371 }
 372
 373 static void brief_detail_super0(struct supertype *st)
 374 {
 375         mdp_super_t *sb = st->sb;
 376         printf(" UUID=");
 377         if (sb->minor_version >= 90)
 378                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 379                        sb->set_uuid2, sb->set_uuid3);
 380         else
 381                 printf("%08x", sb->set_uuid0);
 382 }
 383 #endif
 384
 385 static int match_home0(struct supertype *st, char *homehost)
 386 {
 387         mdp_super_t *sb = st->sb;
 388         char buf[20];
 389         char *hash;
 390
 391         if (!homehost)
 392                 return 0;
 393         hash = sha1_buffer(homehost,
 394                            strlen(homehost),
 395                            buf);
 396
 397         return (memcmp(&sb->set_uuid2, hash, 8)==0);
 398 }
 399
 400 static void uuid_from_super0(struct supertype *st, int uuid[4])
 401 {
 402         mdp_super_t *super = st->sb;
 403         uuid[0] = super->set_uuid0;
 404         if (super->minor_version >= 90) {
 405                 uuid[1] = super->set_uuid1;
 406                 uuid[2] = super->set_uuid2;
 407                 uuid[3] = super->set_uuid3;
 408         } else {
 409                 uuid[1] = 0;
 410                 uuid[2] = 0;
 411                 uuid[3] = 0;
 412         }
 413 }
 414
 415 static void getinfo_super0(struct supertype *st, struct mdinfo *info, char *map)
 416 {
 417         mdp_super_t *sb = st->sb;
 418         int working = 0;
 419         int i;
 420         int map_disks = info->array.raid_disks;
 421
 422         memset(info, 0, sizeof(*info));
 423         info->array.major_version = sb->major_version;
 424         info->array.minor_version = sb->minor_version;
 425         info->array.patch_version = sb->patch_version;
 426         info->array.raid_disks = sb->raid_disks;
 427         info->array.level = sb->level;
 428         info->array.layout = sb->layout;
 429         info->array.md_minor = sb->md_minor;
 430         info->array.ctime = sb->ctime;
 431         info->array.utime = sb->utime;
 432         info->array.chunk_size = sb->chunk_size;
 433         info->array.state = sb->state;
 434         info->component_size = sb->size;
 435         info->component_size *= 2;
 436
 437         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
 438                 info->bitmap_offset = 8;
 439
 440         info->disk.state = sb->this_disk.state;
 441         info->disk.major = sb->this_disk.major;
 442         info->disk.minor = sb->this_disk.minor;
 443         info->disk.raid_disk = sb->this_disk.raid_disk;
 444         info->disk.number = sb->this_disk.number;
 445
 446         info->events = md_event(sb);
 447         info->data_offset = 0;
 448
 449         sprintf(info->text_version, "0.%d", sb->minor_version);
 450         info->safe_mode_delay = 200;
 451
 452         uuid_from_super0(st, info->uuid);
 453
 454         info->recovery_start = MaxSector;
 455         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 456                 info->reshape_active = 1;
 457                 info->reshape_progress = sb->reshape_position;
 458                 info->new_level = sb->new_level;
 459                 info->delta_disks = sb->delta_disks;
 460                 info->new_layout = sb->new_layout;
 461                 info->new_chunk = sb->new_chunk;
 462                 if (info->delta_disks < 0)
 463                         info->array.raid_disks -= info->delta_disks;
 464         } else
 465                 info->reshape_active = 0;
 466
 467         info->recovery_blocked = info->reshape_active;
 468
 469         sprintf(info->name, "%d", sb->md_minor);
 470         /* work_disks is calculated rather than read directly */
 471         for (i=0; i < MD_SB_DISKS; i++)
 472                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 473                     (sb->disks[i].raid_disk < (unsigned)info->array.raid_disks) &&
 474                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 475                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY))) {
 476                         working ++;
 477                         if (map && i < map_disks)
 478                                 map[i] = 1;
 479                 } else if (map && i < map_disks)
 480                         map[i] = 0;
 481         info->array.working_disks = working;
 482 }
 483
 484 static struct mdinfo *container_content0(struct supertype *st, char *subarray)
 485 {
 486         struct mdinfo *info;
 487
 488         if (subarray)
 489                 return NULL;
 490
 491         info = xmalloc(sizeof(*info));
 492         getinfo_super0(st, info, NULL);
 493         return info;
 494 }
 495
 496 static int update_super0(struct supertype *st, struct mdinfo *info,
 497                          char *update,
 498                          char *devname, int verbose,
 499                          int uuid_set, char *homehost)
 500 {
 501         /* NOTE: for 'assemble' and 'force' we need to return non-zero
 502          * if any change was made.  For others, the return value is
 503          * ignored.
 504          */
 505         int rv = 0;
 506         int uuid[4];
 507         mdp_super_t *sb = st->sb;
 508
 509         if (strcmp(update, "homehost") == 0 &&
 510             homehost) {
 511                 /* note that 'homehost' is special as it is really
 512                  * a "uuid" update.
 513                  */
 514                 uuid_set = 0;
 515                 update = "uuid";
 516                 info->uuid[0] = sb->set_uuid0;
 517                 info->uuid[1] = sb->set_uuid1;
 518         }
 519
 520         if (strcmp(update, "sparc2.2")==0 ) {
 521                 /* 2.2 sparc put the events in the wrong place
 522                  * So we copy the tail of the superblock
 523                  * up 4 bytes before continuing
 524                  */
 525                 __u32 *sb32 = (__u32*)sb;
 526                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 527                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 528                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 529                 if (verbose >= 0)
 530                         pr_err("adjusting superblock of %s for 2.2/sparc compatibility.\n",
 531                                devname);
 532         } else if (strcmp(update, "super-minor") ==0) {
 533                 sb->md_minor = info->array.md_minor;
 534                 if (verbose > 0)
 535                         pr_err("updating superblock of %s with minor number %d\n",
 536                                 devname, info->array.md_minor);
 537         } else if (strcmp(update, "summaries") == 0) {
 538                 unsigned int i;
 539                 /* set nr_disks, active_disks, working_disks,
 540                  * failed_disks, spare_disks based on disks[]
 541                  * array in superblock.
 542                  * Also make sure extra slots aren't 'failed'
 543                  */
 544                 sb->nr_disks = sb->active_disks =
 545                         sb->working_disks = sb->failed_disks =
 546                         sb->spare_disks = 0;
 547                 for (i=0; i < MD_SB_DISKS ; i++)
 548                         if (sb->disks[i].major ||
 549                             sb->disks[i].minor) {
 550                                 int state = sb->disks[i].state;
 551                                 if (state & (1<<MD_DISK_REMOVED))
 552                                         continue;
 553                                 sb->nr_disks++;
 554                                 if (state & (1<<MD_DISK_ACTIVE))
 555                                         sb->active_disks++;
 556                                 if (state & (1<<MD_DISK_FAULTY))
 557                                         sb->failed_disks++;
 558                                 else
 559                                         sb->working_disks++;
 560                                 if (state == 0)
 561                                         sb->spare_disks++;
 562                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 563                                 sb->disks[i].state = 0;
 564         } else if (strcmp(update, "force-one")==0) {
 565                 /* Not enough devices for a working array, so
 566                  * bring this one up-to-date.
 567                  */
 568                 __u32 ehi = sb->events_hi, elo = sb->events_lo;
 569                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 570                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 571                 if (sb->events_hi != ehi ||
 572                     sb->events_lo != elo)
 573                         rv = 1;
 574         } else if (strcmp(update, "force-array")==0) {
 575                 /* degraded array and 'force' requested, so
 576                  * maybe need to mark it 'clean'
 577                  */
 578                 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
 579                     (sb->state & (1 << MD_SB_CLEAN)) == 0) {
 580                         /* need to force clean */
 581                         sb->state |= (1 << MD_SB_CLEAN);
 582                         rv = 1;
 583                 }
 584         } else if (strcmp(update, "assemble")==0) {
 585                 int d = info->disk.number;
 586                 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
 587                 int failfast = sb->disks[d].state & (1<<MD_DISK_FAILFAST);
 588                 int mask = (1<<MD_DISK_WRITEMOSTLY)|(1<<MD_DISK_FAILFAST);
 589                 int add = 0;
 590                 if (sb->minor_version >= 91)
 591                         /* During reshape we don't insist on everything
 592                          * being marked 'sync'
 593                          */
 594                         add = (1<<MD_DISK_SYNC);
 595                 if (((sb->disks[d].state & ~mask) | add)
 596                     != (unsigned)info->disk.state) {
 597                         sb->disks[d].state = info->disk.state | wonly |failfast;
 598                         rv = 1;
 599                 }
 600                 if (info->reshape_active &&
 601                     sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
 602                     info->delta_disks >= 0 &&
 603                     info->reshape_progress < sb->reshape_position) {
 604                         sb->reshape_position = info->reshape_progress;
 605                         rv = 1;
 606                 }
 607                 if (info->reshape_active &&
 608                     sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
 609                     info->delta_disks < 0 &&
 610                     info->reshape_progress > sb->reshape_position) {
 611                         sb->reshape_position = info->reshape_progress;
 612                         rv = 1;
 613                 }
 614         } else if (strcmp(update, "linear-grow-new") == 0) {
 615                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 616                 sb->disks[info->disk.number].number = info->disk.number;
 617                 sb->disks[info->disk.number].major = info->disk.major;
 618                 sb->disks[info->disk.number].minor = info->disk.minor;
 619                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 620                 sb->disks[info->disk.number].state = info->disk.state;
 621                 sb->this_disk = sb->disks[info->disk.number];
 622         } else if (strcmp(update, "linear-grow-update") == 0) {
 623                 sb->raid_disks = info->array.raid_disks;
 624                 sb->nr_disks = info->array.nr_disks;
 625                 sb->active_disks = info->array.active_disks;
 626                 sb->working_disks = info->array.working_disks;
 627                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 628                 sb->disks[info->disk.number].number = info->disk.number;
 629                 sb->disks[info->disk.number].major = info->disk.major;
 630                 sb->disks[info->disk.number].minor = info->disk.minor;
 631                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 632                 sb->disks[info->disk.number].state = info->disk.state;
 633         } else if (strcmp(update, "resync") == 0) {
 634                 /* make sure resync happens */
 635                 sb->state &= ~(1<<MD_SB_CLEAN);
 636                 sb->recovery_cp = 0;
 637         } else if (strcmp(update, "uuid") == 0) {
 638                 if (!uuid_set && homehost) {
 639                         char buf[20];
 640                         char *hash = sha1_buffer(homehost,
 641                                                  strlen(homehost),
 642                                                  buf);
 643                         memcpy(info->uuid+2, hash, 8);
 644                 }
 645                 sb->set_uuid0 = info->uuid[0];
 646                 sb->set_uuid1 = info->uuid[1];
 647                 sb->set_uuid2 = info->uuid[2];
 648                 sb->set_uuid3 = info->uuid[3];
 649                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
 650                         struct bitmap_super_s *bm;
 651                         bm = (struct bitmap_super_s*)(sb+1);
 652                         uuid_from_super0(st, uuid);
 653                         memcpy(bm->uuid, uuid, 16);
 654                 }
 655         } else if (strcmp(update, "metadata") == 0) {
 656                 /* Create some v1.0 metadata to match ours but make the
 657                  * ctime bigger.  Also update info->array.*_version.
 658                  * We need to arrange that store_super writes out
 659                  * the v1.0 metadata.
 660                  * Not permitted for unclean array, or array with
 661                  * bitmap.
 662                  */
 663                 if (info->bitmap_offset) {
 664                         pr_err("Cannot update metadata when bitmap is present\n");
 665                         rv = -2;
 666                 } else if (info->array.state != 1) {
 667                         pr_err("Cannot update metadata on unclean array\n");
 668                         rv = -2;
 669                 } else {
 670                         info->array.major_version = 1;
 671                         info->array.minor_version = 0;
 672                         uuid_from_super0(st, info->uuid);
 673                         st->other = super1_make_v0(st, info, st->sb);
 674                 }
 675         } else if (strcmp(update, "revert-reshape") == 0) {
 676                 rv = -2;
 677                 if (sb->minor_version <= 90)
 678                         pr_err("No active reshape to revert on %s\n",
 679                                devname);
 680                 else if (sb->delta_disks == 0)
 681                         pr_err("%s: Can only revert reshape which changes number of devices\n",
 682                                devname);
 683                 else {
 684                         int tmp;
 685                         int parity = sb->level == 6 ? 2 : 1;
 686                         rv = 0;
 687
 688                         if (sb->level >= 4 && sb->level <= 6 &&
 689                             sb->reshape_position % (
 690                                     sb->new_chunk/512 *
 691                                     (sb->raid_disks - sb->delta_disks - parity))) {
 692                                 pr_err("Reshape position is not suitably aligned.\n");
 693                                 pr_err("Try normal assembly and stop again\n");
 694                                 return -2;
 695                         }
 696                         sb->raid_disks -= sb->delta_disks;
 697                         sb->delta_disks = -sb->delta_disks;
 698
 699                         tmp = sb->new_layout;
 700                         sb->new_layout = sb->layout;
 701                         sb->layout = tmp;
 702
 703                         tmp = sb->new_chunk;
 704                         sb->new_chunk = sb->chunk_size;
 705                         sb->chunk_size = tmp;
 706                 }
 707         } else if (strcmp(update, "no-bitmap") == 0) {
 708                 sb->state &= ~(1<<MD_SB_BITMAP_PRESENT);
 709         } else if (strcmp(update, "_reshape_progress")==0)
 710                 sb->reshape_position = info->reshape_progress;
 711         else if (strcmp(update, "writemostly")==0)
 712                 sb->state |= (1<<MD_DISK_WRITEMOSTLY);
 713         else if (strcmp(update, "readwrite")==0)
 714                 sb->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 715         else
 716                 rv = -1;
 717
 718         sb->sb_csum = calc_sb0_csum(sb);
 719         return rv;
 720 }
 721
 722 /*
 723  * For version-0 superblock, the homehost is 'stored' in the uuid.
 724  * 8 bytes for a hash of the host leaving 8 bytes of random material.
 725  * We use the first 8 bytes (64bits) of the sha1 of the host name
 726  */
 727 static int init_super0(struct supertype *st, mdu_array_info_t *info,
 728                        unsigned long long size, char *ignored_name,
 729                        char *homehost, int *uuid,
 730                        unsigned long long data_offset)
 731 {
 732         mdp_super_t *sb;
 733         int spares;
 734
 735         if (data_offset != INVALID_SECTORS) {
 736                 pr_err("data-offset not support for 0.90\n");
 737                 return 0;
 738         }
 739
 740         if (posix_memalign((void**)&sb, 4096,
 741                            MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
 742                 pr_err("could not allocate superblock\n");
 743                 return 0;
 744         }
 745         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 746
 747         st->sb = sb;
 748         if (info == NULL) {
 749                 /* zeroing the superblock */
 750                 return 0;
 751         }
 752
 753         spares = info->working_disks - info->active_disks;
 754         if (info->raid_disks + spares  > MD_SB_DISKS) {
 755                 pr_err("too many devices requested: %d+%d > %d\n",
 756                         info->raid_disks , spares, MD_SB_DISKS);
 757                 return 0;
 758         }
 759
 760         sb->md_magic = MD_SB_MAGIC;
 761         sb->major_version = 0;
 762         sb->minor_version = 90;
 763         sb->patch_version = 0;
 764         sb->gvalid_words = 0; /* ignored */
 765         sb->ctime = time(0);
 766         sb->level = info->level;
 767         sb->size = size;
 768         if (size != (unsigned long long)sb->size)
 769                 return 0;
 770         sb->nr_disks = info->nr_disks;
 771         sb->raid_disks = info->raid_disks;
 772         sb->md_minor = info->md_minor;
 773         sb->not_persistent = 0;
 774         if (uuid) {
 775                 sb->set_uuid0 = uuid[0];
 776                 sb->set_uuid1 = uuid[1];
 777                 sb->set_uuid2 = uuid[2];
 778                 sb->set_uuid3 = uuid[3];
 779         } else {
 780                 __u32 r[4];
 781                 random_uuid((__u8 *)r);
 782                 sb->set_uuid0 = r[0];
 783                 sb->set_uuid1 = r[1];
 784                 sb->set_uuid2 = r[2];
 785                 sb->set_uuid3 = r[3];
 786         }
 787         if (homehost && !uuid) {
 788                 char buf[20];
 789                 char *hash = sha1_buffer(homehost,
 790                                          strlen(homehost),
 791                                          buf);
 792                 memcpy(&sb->set_uuid2, hash, 8);
 793         }
 794
 795         sb->utime = sb->ctime;
 796         sb->state = info->state;
 797         sb->active_disks = info->active_disks;
 798         sb->working_disks = info->working_disks;
 799         sb->failed_disks = info->failed_disks;
 800         sb->spare_disks = info->spare_disks;
 801         sb->events_hi = 0;
 802         sb->events_lo = 1;
 803
 804         sb->layout = info->layout;
 805         sb->chunk_size = info->chunk_size;
 806
 807         return 1;
 808 }
 809
 810 struct devinfo {
 811         int fd;
 812         char *devname;
 813         mdu_disk_info_t disk;
 814         struct devinfo *next;
 815 };
 816
 817 #ifndef MDASSEMBLE
 818 /* Add a device to the superblock being created */
 819 static int add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
 820                          int fd, char *devname, unsigned long long data_offset)
 821 {
 822         mdp_super_t *sb = st->sb;
 823         mdp_disk_t *dk = &sb->disks[dinfo->number];
 824         struct devinfo *di, **dip;
 825
 826         dk->number = dinfo->number;
 827         dk->major = dinfo->major;
 828         dk->minor = dinfo->minor;
 829         dk->raid_disk = dinfo->raid_disk;
 830         dk->state = dinfo->state & ((1<<MD_DISK_ACTIVE) |
 831                                     (1<<MD_DISK_SYNC));
 832
 833         sb->this_disk = sb->disks[dinfo->number];
 834         sb->sb_csum = calc_sb0_csum(sb);
 835
 836         dip = (struct devinfo **)&st->info;
 837         while (*dip)
 838                 dip = &(*dip)->next;
 839         di = xmalloc(sizeof(struct devinfo));
 840         di->fd = fd;
 841         di->devname = devname;
 842         di->disk = *dinfo;
 843         di->next = NULL;
 844         *dip = di;
 845
 846         return 0;
 847 }
 848 #endif
 849
 850 static int store_super0(struct supertype *st, int fd)
 851 {
 852         unsigned long long dsize;
 853         unsigned long long offset;
 854         mdp_super_t *super = st->sb;
 855
 856         if (!get_dev_size(fd, NULL, &dsize))
 857                 return 1;
 858
 859         if (dsize < MD_RESERVED_SECTORS*512)
 860                 return 2;
 861
 862         if (st->other) {
 863                 /* Writing out v1.0 metadata for --update=metadata */
 864                 int ret = 0;
 865
 866                 offset = dsize/512 - 8*2;
 867                 offset &= ~(4*2-1);
 868                 offset *= 512;
 869                 if (lseek64(fd, offset, 0)< 0LL)
 870                         ret = 3;
 871                 else if (write(fd, st->other, 1024) != 1024)
 872                         ret = 4;
 873                 else
 874                         fsync(fd);
 875                 free(st->other);
 876                 st->other = NULL;
 877                 return ret;
 878         }
 879
 880         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 881
 882         offset *= 512;
 883
 884         if (lseek64(fd, offset, 0)< 0LL)
 885                 return 3;
 886
 887         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 888                 return 4;
 889
 890         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 891                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 892                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
 893                         if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
 894                             ROUND_UP(sizeof(*bm),4096))
 895                             return 5;
 896         }
 897
 898         fsync(fd);
 899         return 0;
 900 }
 901
 902 #ifndef MDASSEMBLE
 903 static int write_init_super0(struct supertype *st)
 904 {
 905         mdp_super_t *sb = st->sb;
 906         int rv = 0;
 907         struct devinfo *di;
 908
 909         for (di = st->info ; di && ! rv ; di = di->next) {
 910
 911                 if (di->disk.state & (1 << MD_DISK_FAULTY))
 912                         continue;
 913                 if (di->fd == -1)
 914                         continue;
 915                 while (Kill(di->devname, NULL, 0, -1, 1) == 0)
 916                         ;
 917
 918                 sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
 919
 920                 sb->this_disk = sb->disks[di->disk.number];
 921                 sb->sb_csum = calc_sb0_csum(sb);
 922                 rv = store_super0(st, di->fd);
 923
 924                 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 925                         rv = st->ss->write_bitmap(st, di->fd, NoUpdate);
 926
 927                 if (rv)
 928                         pr_err("failed to write superblock to %s\n",
 929                                di->devname);
 930         }
 931         return rv;
 932 }
 933 #endif
 934
 935 static int compare_super0(struct supertype *st, struct supertype *tst)
 936 {
 937         /*
 938          * return:
 939          *  0 same, or first was empty, and second was copied
 940          *  1 second had wrong number
 941          *  2 wrong uuid
 942          *  3 wrong other info
 943          */
 944         mdp_super_t *first = st->sb;
 945         mdp_super_t *second = tst->sb;
 946         int uuid1[4], uuid2[4];
 947
 948         if (second->md_magic != MD_SB_MAGIC)
 949                 return 1;
 950         if (!first) {
 951                 if (posix_memalign((void**)&first, 4096,
 952                              MD_SB_BYTES +
 953                              ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
 954                         pr_err("could not allocate superblock\n");
 955                         return 1;
 956                 }
 957                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 958                 st->sb = first;
 959                 return 0;
 960         }
 961
 962         uuid_from_super0(st, uuid1);
 963         uuid_from_super0(tst, uuid2);
 964         if (!same_uuid(uuid1, uuid2, 0))
 965                 return 2;
 966         if (first->major_version != second->major_version ||
 967             first->minor_version != second->minor_version ||
 968             first->patch_version != second->patch_version ||
 969             first->gvalid_words  != second->gvalid_words  ||
 970             first->ctime         != second->ctime         ||
 971             first->level         != second->level         ||
 972             first->size          != second->size          ||
 973             first->raid_disks    != second->raid_disks    )
 974                 return 3;
 975
 976         return 0;
 977 }
 978
 979 static void free_super0(struct supertype *st);
 980
 981 static int load_super0(struct supertype *st, int fd, char *devname)
 982 {
 983         /* try to read in the superblock
 984          * Return:
 985          *  0 on success
 986          *  1 on cannot get superblock
 987          *  2 on superblock meaningless
 988          */
 989         unsigned long long dsize;
 990         unsigned long long offset;
 991         mdp_super_t *super;
 992         int uuid[4];
 993         struct bitmap_super_s *bsb;
 994
 995         free_super0(st);
 996
 997         if (!get_dev_size(fd, devname, &dsize))
 998                 return 1;
 999
1000         if (dsize < MD_RESERVED_SECTORS*512) {
1001                 if (devname)
1002                         pr_err("%s is too small for md: size is %llu sectors.\n",
1003                                devname, dsize);
1004                 return 1;
1005         }
1006         st->devsize = dsize;
1007
1008         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1009
1010         offset *= 512;
1011
1012         if (lseek64(fd, offset, 0)< 0LL) {
1013                 if (devname)
1014                         pr_err("Cannot seek to superblock on %s: %s\n",
1015                                 devname, strerror(errno));
1016                 return 1;
1017         }
1018
1019         if (posix_memalign((void**)&super, 4096,
1020                            MD_SB_BYTES +
1021                            ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
1022                 pr_err("could not allocate superblock\n");
1023                 return 1;
1024         }
1025
1026         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
1027                 if (devname)
1028                         pr_err("Cannot read superblock on %s\n",
1029                                 devname);
1030                 free(super);
1031                 return 1;
1032         }
1033
1034         if (st->ss && st->minor_version == 9)
1035                 super0_swap_endian(super);
1036
1037         if (super->md_magic != MD_SB_MAGIC) {
1038                 if (devname)
1039                         pr_err("No super block found on %s (Expected magic %08x, got %08x)\n",
1040                                 devname, MD_SB_MAGIC, super->md_magic);
1041                 free(super);
1042                 return 2;
1043         }
1044
1045         if (super->major_version != 0) {
1046                 if (devname)
1047                         pr_err("Cannot interpret superblock on %s - version is %d\n",
1048                                 devname, super->major_version);
1049                 free(super);
1050                 return 2;
1051         }
1052         st->sb = super;
1053
1054         if (st->ss == NULL) {
1055                 st->ss = &super0;
1056                 st->minor_version = super->minor_version;
1057                 st->max_devs = MD_SB_DISKS;
1058                 st->info = NULL;
1059         }
1060
1061         /* Now check on the bitmap superblock */
1062         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
1063                 return 0;
1064         /* Read the bitmap superblock and make sure it looks
1065          * valid.  If it doesn't clear the bit.  An --assemble --force
1066          * should get that written out.
1067          */
1068         if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096))
1069             != ROUND_UP(sizeof(struct bitmap_super_s),4096))
1070                 goto no_bitmap;
1071
1072         uuid_from_super0(st, uuid);
1073         bsb = (struct bitmap_super_s *)(super+1);
1074         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1075             memcmp(bsb->uuid, uuid, 16) != 0)
1076                 goto no_bitmap;
1077         return 0;
1078
1079  no_bitmap:
1080         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
1081
1082         return 0;
1083 }
1084
1085 static struct supertype *match_metadata_desc0(char *arg)
1086 {
1087         struct supertype *st = xcalloc(1, sizeof(*st));
1088
1089         st->container_devnm[0] = 0;
1090         st->ss = &super0;
1091         st->info = NULL;
1092         st->minor_version = 90;
1093         st->max_devs = MD_SB_DISKS;
1094         st->sb = NULL;
1095         /* we sometimes get 00.90 */
1096         while (arg[0] == '0' && arg[1] == '0')
1097                 arg++;
1098         if (strcmp(arg, "0") == 0 ||
1099 #ifdef DEFAULT_OLD_METADATA /* ifndef in super1.c */
1100             strcmp(arg, "default") == 0 ||
1101 #endif /* DEFAULT_OLD_METADATA */
1102             strcmp(arg, "0.90") == 0 ||
1103             strcmp(arg, "") == 0 /* no metadata  - i.e. non_persistent */
1104                 )
1105                 return st;
1106
1107         st->minor_version = 91; /* reshape in progress */
1108         if (strcmp(arg, "0.91") == 0) /* For dup_super support */
1109                 return st;
1110
1111         st->minor_version = 9; /* flag for 'byte-swapped' */
1112         if (strcmp(arg, "0.swap")==0 ||
1113             strcmp(arg, "0.9") == 0) /* For dup_super support */
1114                 return st;
1115
1116         free(st);
1117         return NULL;
1118 }
1119
1120 static __u64 avail_size0(struct supertype *st, __u64 devsize,
1121                          unsigned long long data_offset)
1122 {
1123         if (data_offset != 0 && data_offset != INVALID_SECTORS)
1124                 return 0ULL;
1125         if (devsize < MD_RESERVED_SECTORS)
1126                 return 0ULL;
1127         return MD_NEW_SIZE_SECTORS(devsize);
1128 }
1129
1130 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
1131                                 int delay, int write_behind,
1132                                 unsigned long long size, int may_change,
1133                                 int major)
1134 {
1135         /*
1136          * The bitmap comes immediately after the superblock and must be 60K in size
1137          * at most.  The default size is between 30K and 60K
1138          *
1139          * size is in sectors,  chunk is in bytes !!!
1140          */
1141         unsigned long long bits;
1142         unsigned long long max_bits = (60*1024 - sizeof(bitmap_super_t))*8;
1143         unsigned long long min_chunk;
1144         int chunk = *chunkp;
1145         mdp_super_t *sb = st->sb;
1146         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
1147         int uuid[4];
1148
1149         min_chunk = 4096; /* sub-page chunks don't work yet.. */
1150         bits = (size * 512) / min_chunk + 1;
1151         while (bits > max_bits) {
1152                 min_chunk *= 2;
1153                 bits = (bits+1)/2;
1154         }
1155         if (chunk == UnSet) {
1156                 /* A chunk size less than a few Megabytes gives poor
1157                  * performance without increasing resync noticeably
1158                  */
1159                 chunk = min_chunk;
1160                 if (chunk < 64*1024*1024)
1161                         chunk = 64*1024*1024;
1162         } else if ((unsigned long long)chunk < min_chunk)
1163                 return -EINVAL; /* chunk size too small */
1164
1165         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1166
1167         memset(bms, 0, sizeof(*bms));
1168         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1169         bms->version = __cpu_to_le32(major);
1170         uuid_from_super0(st, uuid);
1171         memcpy(bms->uuid, uuid, 16);
1172         bms->chunksize = __cpu_to_le32(chunk);
1173         bms->daemon_sleep = __cpu_to_le32(delay);
1174         bms->sync_size = __cpu_to_le64(size);
1175         bms->write_behind = __cpu_to_le32(write_behind);
1176         *chunkp = chunk;
1177         return 0;
1178 }
1179
1180 static int locate_bitmap0(struct supertype *st, int fd, int node_num)
1181 {
1182         unsigned long long dsize;
1183         unsigned long long offset;
1184
1185         if (!get_dev_size(fd, NULL, &dsize))
1186                 return -1;
1187
1188         if (dsize < MD_RESERVED_SECTORS*512)
1189                 return -1;
1190
1191         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1192
1193         offset *= 512;
1194
1195         offset += MD_SB_BYTES;
1196
1197         lseek64(fd, offset, 0);
1198         return 0;
1199 }
1200
1201 static int write_bitmap0(struct supertype *st, int fd, enum bitmap_update update)
1202 {
1203         unsigned long long dsize;
1204         unsigned long long offset;
1205         mdp_super_t *sb = st->sb;
1206
1207         int rv = 0;
1208
1209         int towrite, n;
1210         void *buf;
1211
1212         if (!get_dev_size(fd, NULL, &dsize))
1213                 return 1;
1214
1215         if (dsize < MD_RESERVED_SECTORS*512)
1216                 return -1;
1217
1218         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1219
1220         offset *= 512;
1221
1222         if (lseek64(fd, offset + 4096, 0)< 0LL)
1223                 return 3;
1224
1225         if (posix_memalign(&buf, 4096, 4096))
1226                 return -ENOMEM;
1227
1228         memset(buf, 0xff, 4096);
1229         memcpy(buf,  ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
1230         towrite = 60*1024;
1231         while (towrite > 0) {
1232                 n = towrite;
1233                 if (n > 4096)
1234                         n = 4096;
1235                 n = write(fd, buf, n);
1236                 if (n > 0)
1237                         towrite -= n;
1238                 else
1239                         break;
1240                 memset(buf, 0xff, 4096);
1241         }
1242         fsync(fd);
1243         if (towrite)
1244                 rv = -2;
1245
1246         free(buf);
1247         return rv;
1248 }
1249
1250 static void free_super0(struct supertype *st)
1251 {
1252         if (st->sb)
1253                 free(st->sb);
1254         while (st->info) {
1255                 struct devinfo *di = st->info;
1256                 st->info = di->next;
1257                 if (di->fd >= 0)
1258                         close(di->fd);
1259                 free(di);
1260         }
1261         st->sb = NULL;
1262 }
1263
1264 #ifndef MDASSEMBLE
1265 static int validate_geometry0(struct supertype *st, int level,
1266                               int layout, int raiddisks,
1267                               int *chunk, unsigned long long size,
1268                               unsigned long long data_offset,
1269                               char *subdev, unsigned long long *freesize,
1270                               int verbose)
1271 {
1272         unsigned long long ldsize;
1273         int fd;
1274         unsigned int tbmax = 4;
1275
1276         /* prior to linux 3.1, a but limits usable device size to 2TB.
1277          * It was introduced in 2.6.29, but we won't worry about that detail
1278          */
1279         if (get_linux_version() < 3001000)
1280                 tbmax = 2;
1281
1282         if (level == LEVEL_CONTAINER) {
1283                 if (verbose)
1284                         pr_err("0.90 metadata does not support containers\n");
1285                 return 0;
1286         }
1287         if (raiddisks > MD_SB_DISKS) {
1288                 if (verbose)
1289                         pr_err("0.90 metadata supports at most %d devices per array\n",
1290                                 MD_SB_DISKS);
1291                 return 0;
1292         }
1293         if (size >= tbmax * 2ULL*1024*1024*1024) {
1294                 if (verbose)
1295                         pr_err("0.90 metadata supports at most %d terabytes per device\n", tbmax);
1296                 return 0;
1297         }
1298         if (*chunk == UnSet)
1299                 *chunk = DEFAULT_CHUNK;
1300
1301         if (!subdev)
1302                 return 1;
1303
1304         fd = open(subdev, O_RDONLY|O_EXCL, 0);
1305         if (fd < 0) {
1306                 if (verbose)
1307                         pr_err("super0.90 cannot open %s: %s\n",
1308                                 subdev, strerror(errno));
1309                 return 0;
1310         }
1311
1312         if (!get_dev_size(fd, subdev, &ldsize)) {
1313                 close(fd);
1314                 return 0;
1315         }
1316         close(fd);
1317
1318         if (ldsize < MD_RESERVED_SECTORS * 512)
1319                 return 0;
1320         *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
1321         return 1;
1322 }
1323 #endif /* MDASSEMBLE */
1324
1325 struct superswitch super0 = {
1326 #ifndef MDASSEMBLE
1327         .examine_super = examine_super0,
1328         .brief_examine_super = brief_examine_super0,
1329         .export_examine_super = export_examine_super0,
1330         .detail_super = detail_super0,
1331         .brief_detail_super = brief_detail_super0,
1332         .write_init_super = write_init_super0,
1333         .validate_geometry = validate_geometry0,
1334         .add_to_super = add_to_super0,
1335         .copy_metadata = copy_metadata0,
1336 #endif
1337         .match_home = match_home0,
1338         .uuid_from_super = uuid_from_super0,
1339         .getinfo_super = getinfo_super0,
1340         .container_content = container_content0,
1341         .update_super = update_super0,
1342         .init_super = init_super0,
1343         .store_super = store_super0,
1344         .compare_super = compare_super0,
1345         .load_super = load_super0,
1346         .match_metadata_desc = match_metadata_desc0,
1347         .avail_size = avail_size0,
1348         .add_internal_bitmap = add_internal_bitmap0,
1349         .locate_bitmap = locate_bitmap0,
1350         .write_bitmap = write_bitmap0,
1351         .free_super = free_super0,
1352         .name = "0.90",
1353 };