super1.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #include "mdadm.h"
  31
  32 #include "asm/byteorder.h"
  33 /*
  34  * The version-1 superblock :
  35  * All numeric fields are little-endian.
  36  *
  37  * total size: 256 bytes plus 2 per device.
  38  *  1K allows 384 devices.
  39  */
  40 struct mdp_superblock_1 {
  41         /* constant array information - 128 bytes */
  42         __u32   magic;          /* MD_SB_MAGIC: 0xa92b4efc - little endian */
  43         __u32   major_version;  /* 1 */
  44         __u32   feature_map;    /* 0 for now */
  45         __u32   pad0;           /* always set to 0 when writing */
  46
  47         __u8    set_uuid[16];   /* user-space generated. */
  48         char    set_name[32];   /* set and interpreted by user-space */
  49
  50         __u64   ctime;          /* lo 40 bits are seconds, top 24 are microseconds or 0*/
  51         __u32   level;          /* -4 (multipath), -1 (linear), 0,1,4,5 */
  52         __u32   layout;         /* only for raid5 currently */
  53         __u64   size;           /* used size of component devices, in 512byte sectors */
  54
  55         __u32   chunksize;      /* in 512byte sectors */
  56         __u32   raid_disks;
  57         __u8    pad1[128-96];   /* set to 0 when written */
  58
  59         /* constant this-device information - 64 bytes */
  60         __u64   data_offset;    /* sector start of data, often 0 */
  61         __u64   data_size;      /* sectors in this device that can be used for data */
  62         __u64   super_offset;   /* sector start of this superblock */
  63         __u64   recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
  64         __u32   dev_number;     /* permanent identifier of this  device - not role in raid */
  65         __u32   cnt_corrected_read; /* number of read errors that were corrected by re-writing */
  66         __u8    device_uuid[16]; /* user-space setable, ignored by kernel */
  67         __u8    pad2[64-56];    /* set to 0 when writing */
  68
  69         /* array state information - 64 bytes */
  70         __u64   utime;          /* 40 bits second, 24 btes microseconds */
  71         __u64   events;         /* incremented when superblock updated */
  72         __u64   resync_offset;  /* data before this offset (from data_offset) known to be in sync */
  73         __u32   sb_csum;        /* checksum upto devs[max_dev] */
  74         __u32   max_dev;        /* size of devs[] array to consider */
  75         __u8    pad3[64-32];    /* set to 0 when writing */
  76
  77         /* device state information. Indexed by dev_number.
  78          * 2 bytes per device
  79          * Note there are no per-device state flags. State information is rolled
  80          * into the 'roles' value.  If a device is spare or faulty, then it doesn't
  81          * have a meaningful role.
  82          */
  83         __u16   dev_roles[0];   /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
  84 };
  85
  86 #define offsetof(t,f) ((int)&(((t*)0)->f))
  87 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
  88 {
  89         unsigned int disk_csum, csum;
  90         unsigned long long newcsum;
  91         int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2;
  92         unsigned int *isuper = (unsigned int*)sb;
  93         int i;
  94
  95 /* make sure I can count... */
  96         if (offsetof(struct mdp_superblock_1,data_offset) != 128 ||
  97             offsetof(struct mdp_superblock_1, utime) != 192 ||
  98             sizeof(struct mdp_superblock_1) != 256) {
  99                 fprintf(stderr, "WARNING - superblock isn't sized correctly\n");
 100         }
 101
 102         disk_csum = sb->sb_csum;
 103         sb->sb_csum = 0;
 104         newcsum = 0;
 105         for (i=0; size>=4; size -= 4 )
 106                 newcsum += __le32_to_cpu(*isuper++);
 107
 108         if (size == 2)
 109                 newcsum += __le16_to_cpu(*(unsigned short*) isuper);
 110
 111         csum = (newcsum & 0xffffffff) + (newcsum >> 32);
 112         sb->sb_csum = disk_csum;
 113         return csum;
 114 }
 115
 116
 117 static void examine_super1(void *sbv)
 118 {
 119         struct mdp_superblock_1 *sb = sbv;
 120         time_t atime;
 121         int d;
 122         int spares, faulty;
 123         int i;
 124         char *c;
 125
 126         printf("          Magic : %08x\n", __le32_to_cpu(sb->magic));
 127         printf("        Version : %02d.%02d\n", 1, __le32_to_cpu(sb->feature_map));
 128         printf("     Array UUID : ");
 129         for (i=0; i<16; i++) {
 130                 printf("%02x", sb->set_uuid[i]);
 131                 if ((i&3)==0 && i != 0) printf(":");
 132         }
 133         printf("\n");
 134         printf("           Name : %.32s\n", sb->set_name);
 135
 136         atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
 137         printf("  Creation Time : %.24s\n", ctime(&atime));
 138         c=map_num(pers, __le32_to_cpu(sb->level));
 139         printf("     Raid Level : %s\n", c?c:"-unknown-");
 140         printf("   Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
 141         printf("\n");
 142         printf("    Device Size : %llu%s\n", sb->data_size, human_size(sb->data_size<<9));
 143         if (sb->data_offset)
 144                 printf("    Data Offset : %llu sectors\n", __le64_to_cpu(sb->data_offset));
 145         if (sb->super_offset)
 146                 printf("   Super Offset : %llu sectors\n", __le64_to_cpu(sb->super_offset));
 147         printf("    Device UUID : ");
 148         for (i=0; i<16; i++) {
 149                 printf("%02x", sb->set_uuid[i]);
 150                 if ((i&3)==0 && i != 0) printf(":");
 151         }
 152         printf("\n");
 153
 154         atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
 155         printf("    Update Time : %.24s\n", ctime(&atime));
 156
 157         if (calc_sb_1_csum(sb) == sb->sb_csum)
 158                 printf("       Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
 159         else
 160                 printf("       Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
 161                        __le32_to_cpu(calc_sb_1_csum(sb)));
 162         printf("         Events : %llu\n", __le64_to_cpu(sb->events));
 163         printf("\n");
 164         if (__le32_to_cpu(sb->level) == 5) {
 165                 c = map_num(r5layout, __le32_to_cpu(sb->layout));
 166                 printf("         Layout : %s\n", c?c:"-unknown-");
 167         }
 168         switch(__le32_to_cpu(sb->level)) {
 169         case 0:
 170         case 4:
 171         case 5:
 172                 printf("     Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize/2));
 173                 break;
 174         case -1:
 175                 printf("       Rounding : %dK\n", __le32_to_cpu(sb->chunksize/2));
 176                 break;
 177         default: break;
 178         }
 179         printf("\n");
 180         printf("   Array State : ");
 181         for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
 182                 int cnt = 0;
 183                 int me = 0;
 184                 int i;
 185                 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
 186                         int role = __le16_to_cpu(sb->dev_roles[i]);
 187                         if (role == d) {
 188                                 if (i == __le32_to_cpu(sb->dev_number))
 189                                         me = 1;
 190                                 cnt++;
 191                         }
 192                 }
 193                 if (cnt > 1) printf("?");
 194                 else if (cnt == 1 && me) printf("U");
 195                 else if (cnt == 1) printf("u");
 196                 else printf ("_");
 197         }
 198         spares = faulty = 0;
 199         for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
 200                 int role = __le16_to_cpu(sb->dev_roles[i]);
 201                 switch (role) {
 202                 case 0xFFFF: spares++; break;
 203                 case 0xFFFE: faulty++;
 204                 }
 205         }
 206         if (spares) printf(" %d spares", spares);
 207         if (faulty) printf(" %d failed", faulty);
 208         printf("\n");
 209 }
 210
 211
 212 static void brief_examine_super1(void *sbv)
 213 {
 214         struct mdp_superblock_1 *sb = sbv;
 215         int i;
 216
 217         char *c=map_num(pers, __le32_to_cpu(sb->level));
 218
 219         printf("ARRAY /dev/?? level=%s metadata=1 num-devices=%d UUID=",
 220                c?c:"-unknown-", sb->raid_disks);
 221         for (i=0; i<16; i++) {
 222                 printf("%02x", sb->set_uuid[i]);
 223                 if ((i&3)==0 && i != 0) printf(":");
 224         }
 225         printf("\n");
 226 }
 227
 228 static void detail_super1(void *sbv)
 229 {
 230         struct mdp_superblock_1 *sb = sbv;
 231         int i;
 232
 233         printf("           UUID : ");
 234         for (i=0; i<16; i++) {
 235                 printf("%02x", sb->set_uuid[i]);
 236                 if ((i&3)==0 && i != 0) printf(":");
 237         }
 238         printf("\n         Events : %llu\n\n", __le64_to_cpu(sb->events));
 239 }
 240
 241 static void brief_detail_super1(void *sbv)
 242 {
 243         struct mdp_superblock_1 *sb = sbv;
 244         int i;
 245
 246         printf(" UUID=");
 247         for (i=0; i<16; i++) {
 248                 printf("%02x", sb->set_uuid[i]);
 249                 if ((i&3)==0 && i != 0) printf(":");
 250         }
 251 }
 252
 253 static void uuid_from_super1(int uuid[4], void * sbv)
 254 {
 255         struct mdp_superblock_1 *super = sbv;
 256         char *cuuid = (char*)uuid;
 257         int i;
 258         for (i=0; i<16; i++)
 259                 cuuid[i] = super->set_uuid[i];
 260 }
 261
 262 static void getinfo_super1(struct mdinfo *info, void *sbv)
 263 {
 264         struct mdp_superblock_1 *sb = sbv;
 265         int working = 0;
 266         int i;
 267         int role;
 268
 269         info->array.major_version = 1;
 270         info->array.minor_version = __le32_to_cpu(sb->feature_map);
 271         info->array.patch_version = 0;
 272         info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
 273         info->array.level = __le32_to_cpu(sb->level);
 274         info->array.md_minor = -1;
 275         info->array.ctime = __le64_to_cpu(sb->ctime);
 276
 277         info->disk.major = 0;
 278         info->disk.minor = 0;
 279
 280         if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
 281             __le32_to_cpu(sb->max_dev) > 512)
 282                 role = 0xfffe;
 283         else
 284                 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
 285
 286         info->disk.raid_disk = -1;
 287         switch(role) {
 288         case 0xFFFF:
 289                 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
 290                 break;
 291         case 0xFFFE:
 292                 info->disk.state = 1; /* faulty */
 293                 break;
 294         default:
 295                 info->disk.state = 6; /* active and in sync */
 296                 info->disk.raid_disk = role;
 297         }
 298         info->events = __le64_to_cpu(sb->events);
 299
 300         memcpy(info->uuid, sb->set_uuid, 16);
 301
 302         for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
 303                 role = __le16_to_cpu(sb->dev_roles[i]);
 304                 if (role == 0xFFFF || role < info->array.raid_disks)
 305                         working++;
 306         }
 307
 308         info->array.working_disks = working;
 309 }
 310
 311 static int update_super1(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
 312 {
 313         int rv = 0;
 314         struct mdp_superblock_1 *sb = sbv;
 315
 316         if (strcmp(update, "force")==0) {
 317                 sb->events = __cpu_to_le32(info->events);
 318                 switch(__le32_to_cpu(sb->level)) {
 319                 case 5: case 4: case 6:
 320                         /* need to force clean */
 321                         sb->resync_offset = ~0ULL;
 322                 }
 323         }
 324         if (strcmp(update, "assemble")==0) {
 325                 int d = info->disk.number;
 326                 int want;
 327                 if (info->disk.state == 6)
 328                         want = __cpu_to_le32(info->disk.raid_disk);
 329                 else
 330                         want = 0xFFFF;
 331                 if (sb->dev_roles[d] != want) {
 332                         sb->dev_roles[d] = want;
 333                         rv = 1;
 334                 }
 335         }
 336 #if 0
 337         if (strcmp(update, "newdev") == 0) {
 338                 int d = info->disk.number;
 339                 memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
 340                 sb->disks[d].number = d;
 341                 sb->disks[d].major = info->disk.major;
 342                 sb->disks[d].minor = info->disk.minor;
 343                 sb->disks[d].raid_disk = info->disk.raid_disk;
 344                 sb->disks[d].state = info->disk.state;
 345                 sb->this_disk = sb->disks[d];
 346         }
 347 #endif
 348         if (strcmp(update, "grow") == 0) {
 349                 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
 350                 /* FIXME */
 351         }
 352         if (strcmp(update, "resync") == 0) {
 353                 /* make sure resync happens */
 354                 sb->resync_offset = ~0ULL;
 355         }
 356
 357         sb->sb_csum = calc_sb_1_csum(sb);
 358         return rv;
 359 }
 360
 361
 362 static __u64 event_super1(void *sbv)
 363 {
 364         struct mdp_superblock_1 *sb = sbv;
 365         return __le64_to_cpu(sb->events);
 366 }
 367
 368 static int init_super1(void **sbp, mdu_array_info_t *info)
 369 {
 370         struct mdp_superblock_1 *sb = malloc(1024);
 371         int spares;
 372         memset(sb, 0, 1024);
 373
 374         if (info->major_version == -1)
 375                 /* zeroing superblock */
 376                 return 0;
 377
 378         spares = info->working_disks - info->active_disks;
 379         if (info->raid_disks + spares  > 384) {
 380                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 381                         info->raid_disks , spares, 384);
 382                 return 0;
 383         }
 384
 385
 386         sb->magic = __cpu_to_le32(MD_SB_MAGIC);
 387         sb->major_version = __cpu_to_le32(1);
 388         sb->feature_map = 0;
 389         sb->pad0 = 0;
 390         *(__u32*)(sb->set_uuid) = random();
 391         *(__u32*)(sb->set_uuid+4) = random();
 392         *(__u32*)(sb->set_uuid+8) = random();
 393         *(__u32*)(sb->set_uuid+12) = random();
 394
 395         /* FIXME name */
 396
 397         sb->ctime = __cpu_to_le64((unsigned long long)time(0));
 398         sb->level = __cpu_to_le32(info->level);
 399         sb->layout = __cpu_to_le32(info->level);
 400         sb->size = __cpu_to_le64(info->size*2ULL);
 401         sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
 402         sb->raid_disks = __cpu_to_le32(info->raid_disks);
 403
 404         sb->data_offset = __cpu_to_le64(0);
 405         sb->data_size = __cpu_to_le64(0);
 406         sb->super_offset = __cpu_to_le64(0);
 407         sb->recovery_offset = __cpu_to_le64(0);
 408
 409         sb->utime = sb->ctime;
 410         sb->events = __cpu_to_le64(1);
 411         if (info->state & MD_SB_CLEAN)
 412                 sb->resync_offset = ~0ULL;
 413         else
 414                 sb->resync_offset = 0;
 415         sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
 416                                     sizeof(sb->dev_roles[0]));
 417         memset(sb->pad3, 0, sizeof(sb->pad3));
 418
 419         memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
 420
 421         *sbp = sb;
 422         return 1;
 423 }
 424
 425 /* Add a device to the superblock being created */
 426 static void add_to_super1(void *sbv, mdu_disk_info_t *dk)
 427 {
 428         struct mdp_superblock_1 *sb = sbv;
 429         __u16 *rp = sb->dev_roles + dk->number;
 430         if (dk->state == 6) /* active, sync */
 431                 *rp = __cpu_to_le16(dk->raid_disk);
 432         else if (dk->state == 2) /* active -> spare */
 433                 *rp = 0xffff;
 434         else
 435                 *rp = 0xfffe;
 436 }
 437
 438 static int store_super1(int fd, void *sbv)
 439 {
 440         struct mdp_superblock_1 *sb = sbv;
 441         long long sb_offset;
 442         int sbsize;
 443
 444
 445         sb_offset = __le64_to_cpu(sb->super_offset) << 9;
 446
 447         if (lseek64(fd, sb_offset, 0)< 0LL)
 448                 return 3;
 449
 450         sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
 451
 452         if (write(fd, sb, sbsize) != sbsize)
 453                 return 4;
 454
 455         return 0;
 456 }
 457
 458 static int write_init_super1(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
 459 {
 460         struct mdp_superblock_1 *sb = sbv;
 461         int fd = open(devname, O_RDWR, O_EXCL);
 462         int rv;
 463
 464         long size;
 465         long long sb_offset;
 466
 467
 468         if (fd < 0) {
 469                 fprintf(stderr, Name ": Failed to open %s to write superblock\n",
 470                         devname);
 471                 return -1;
 472         }
 473
 474         sb->dev_number = __cpu_to_le32(dinfo->number);
 475         *(__u32*)(sb->device_uuid) = random();
 476         *(__u32*)(sb->device_uuid+4) = random();
 477         *(__u32*)(sb->device_uuid+8) = random();
 478         *(__u32*)(sb->device_uuid+12) = random();
 479
 480
 481         if (ioctl(fd, BLKGETSIZE, &size))
 482                 return 1;
 483
 484         if (size < 24)
 485                 return 2;
 486
 487
 488         /*
 489          * Calculate the position of the superblock.
 490          * It is always aligned to a 4K boundary and
 491          * depending on minor_version, it can be:
 492          * 0: At least 8K, but less than 12K, from end of device
 493          * 1: At start of device
 494          * 2: 4K from start of device.
 495          */
 496         switch(st->minor_version) {
 497         case 0:
 498                 sb_offset = size;
 499                 sb_offset -= 8*2;
 500                 sb_offset &= ~(4*2-1);
 501                 sb->super_offset = __cpu_to_le64(sb_offset);
 502                 sb->data_offset = __cpu_to_le64(0);
 503                 sb->data_size = sb->super_offset;
 504                 break;
 505         case 1:
 506                 sb->super_offset = __cpu_to_le64(0);
 507                 sb->data_offset = __cpu_to_le64(2);
 508                 sb->data_size = __cpu_to_le64(size - 2);
 509                 break;
 510         case 2:
 511                 sb_offset = 4*2;
 512                 sb->super_offset = __cpu_to_le64(sb_offset);
 513                 sb->data_offset = __cpu_to_le64(sb_offset+2);
 514                 sb->data_size = __cpu_to_le64(size - 4*2 - 2);
 515                 break;
 516         default:
 517                 return -EINVAL;
 518         }
 519
 520
 521         sb->sb_csum = calc_sb_1_csum(sb);
 522         rv = store_super1(fd, sb);
 523         if (rv)
 524                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
 525         return rv;
 526 }
 527
 528 static int compare_super1(void **firstp, void *secondv)
 529 {
 530         /*
 531          * return:
 532          *  0 same, or first was empty, and second was copied
 533          *  1 second had wrong number
 534          *  2 wrong uuid
 535          *  3 wrong other info
 536          */
 537         struct mdp_superblock_1 *first = *firstp;
 538         struct mdp_superblock_1 *second = secondv;
 539
 540         if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
 541                 return 1;
 542         if (second->major_version != __cpu_to_le32(1))
 543                 return 1;
 544
 545         if (!first) {
 546                 first = malloc(1024);
 547                 memcpy(first, second, 1024);
 548                 *firstp = first;
 549                 return 0;
 550         }
 551         if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
 552                 return 2;
 553
 554         if (first->ctime      != second->ctime     ||
 555             first->level      != second->level     ||
 556             first->layout     != second->layout    ||
 557             first->size       != second->size      ||
 558             first->chunksize  != second->chunksize ||
 559             first->raid_disks != second->raid_disks)
 560                 return 3;
 561         return 0;
 562 }
 563
 564 static int load_super1(struct supertype *st, int fd, void **sbp, char *devname)
 565 {
 566         unsigned long size;
 567         unsigned long long sb_offset;
 568         struct mdp_superblock_1 *super;
 569
 570
 571
 572         if (st->ss == NULL) {
 573                 /* guess... */
 574                 st->ss = &super1;
 575                 for (st->minor_version = 0; st->minor_version <= 2 ; st->minor_version++) {
 576                         switch(load_super1(st, fd, sbp, devname)) {
 577                         case 0: return 0; /* good */
 578                         case 1: st->ss = NULL; return 1; /*bad device */
 579                         case 2: break; /* bad, try next */
 580                         }
 581                 }
 582                 st->ss = NULL;
 583                 return 2;
 584         }
 585         if (ioctl(fd, BLKGETSIZE, &size)) {
 586                 if (devname)
 587                         fprintf(stderr, Name ": cannot find device size for %s: %s\n",
 588                                 devname, strerror(errno));
 589                 return 1;
 590         }
 591
 592         if (size < 24) {
 593                 if (devname)
 594                         fprintf(stderr, Name ": %s is too small for md: size is %lu sectors.\n",
 595                                 devname, size);
 596                 return 1;
 597         }
 598
 599         /*
 600          * Calculate the position of the superblock.
 601          * It is always aligned to a 4K boundary and
 602          * depeding on minor_version, it can be:
 603          * 0: At least 8K, but less than 12K, from end of device
 604          * 1: At start of device
 605          * 2: 4K from start of device.
 606          */
 607         switch(st->minor_version) {
 608         case 0:
 609                 sb_offset = size;
 610                 sb_offset -= 8*2;
 611                 sb_offset &= ~(4*2-1);
 612                 break;
 613         case 1:
 614                 sb_offset = 0;
 615                 break;
 616         case 2:
 617                 sb_offset = 4*2;
 618                 break;
 619         default:
 620                 return -EINVAL;
 621         }
 622
 623         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 624
 625
 626         if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
 627                 if (devname)
 628                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 629                                 devname, strerror(errno));
 630                 return 1;
 631         }
 632
 633         super = malloc(1024);
 634
 635         if (read(fd, super, 1024) != 1024) {
 636                 if (devname)
 637                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 638                                 devname);
 639                 free(super);
 640                 return 1;
 641         }
 642
 643         if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
 644                 if (devname)
 645                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 646                                 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
 647                 free(super);
 648                 return 2;
 649         }
 650
 651         if (__le32_to_cpu(super->major_version) != 1) {
 652                 if (devname)
 653                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 654                                 devname, __le32_to_cpu(super->major_version));
 655                 free(super);
 656                 return 2;
 657         }
 658         if (__le64_to_cpu(super->super_offset) != sb_offset) {
 659                 if (devname)
 660                         fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
 661                                 devname);
 662                 free(super);
 663                 return 2;
 664         }
 665         *sbp = super;
 666         return 0;
 667 }
 668
 669
 670 static struct supertype *match_metadata_desc1(char *arg)
 671 {
 672         struct supertype *st = malloc(sizeof(*st));
 673         if (!st) return st;
 674
 675         st->ss = &super1;
 676         if (strcmp(arg, "1") == 0 ||
 677             strcmp(arg, "1.0") == 0) {
 678                 st->minor_version = 0;
 679                 return st;
 680         }
 681         if (strcmp(arg, "1.1") == 0) {
 682                 st->minor_version = 1;
 683                 return st;
 684         }
 685         if (strcmp(arg, "1.2") == 0) {
 686                 st->minor_version = 2;
 687                 return st;
 688         }
 689
 690         free(st);
 691         return NULL;
 692 }
 693
 694 static __u64 avail_size1(__u64 devsize)
 695 {
 696         if (devsize < 24)
 697                 return 0;
 698
 699         return (devsize - 8*2 ) & ~(4*2-1);
 700 }
 701
 702 struct superswitch super1 = {
 703         .examine_super = examine_super1,
 704         .brief_examine_super = brief_examine_super1,
 705         .detail_super = detail_super1,
 706         .brief_detail_super = brief_detail_super1,
 707         .uuid_from_super = uuid_from_super1,
 708         .getinfo_super = getinfo_super1,
 709         .update_super = update_super1,
 710         .event_super = event_super1,
 711         .init_super = init_super1,
 712         .add_to_super = add_to_super1,
 713         .store_super = store_super1,
 714         .write_init_super = write_init_super1,
 715         .compare_super = compare_super1,
 716         .load_super = load_super1,
 717         .match_metadata_desc = match_metadata_desc1,
 718         .avail_size = avail_size1,
 719         .major = 1,
 720 };