super0.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #define HAVE_STDINT_H 1
  31 #include "mdadm.h"
  32 #include "sha1.h"
  33 /*
  34  * All handling for the 0.90.0 version superblock is in
  35  * this file.
  36  * This includes:
  37  *   - finding, loading, and writing the superblock.
  38  *   - initialising a new superblock
  39  *   - printing the superblock for --examine
  40  *   - printing part of the superblock for --detail
  41  * .. other stuff
  42  */
  43
  44
  45 static unsigned long calc_sb0_csum(mdp_super_t *super)
  46 {
  47         unsigned long csum = super->sb_csum;
  48         unsigned long newcsum;
  49         super->sb_csum= 0 ;
  50         newcsum = calc_csum(super, MD_SB_BYTES);
  51         super->sb_csum = csum;
  52         return newcsum;
  53 }
  54
  55
  56 void super0_swap_endian(struct mdp_superblock_s *sb)
  57 {
  58         /* as super0 superblocks are host-endian, it is sometimes
  59          * useful to be able to swap the endianness
  60          * as (almost) everything is u32's we byte-swap every 4byte
  61          * number.
  62          * We then also have to swap the events_hi and events_lo
  63          */
  64         char *sbc = (char *)sb;
  65         __u32 t32;
  66         int i;
  67
  68         for (i=0; i < MD_SB_BYTES ; i+=4) {
  69                 char t = sbc[i];
  70                 sbc[i] = sbc[i+3];
  71                 sbc[i+3] = t;
  72                 t=sbc[i+1];
  73                 sbc[i+1]=sbc[i+2];
  74                 sbc[i+2]=t;
  75         }
  76         t32 = sb->events_hi;
  77         sb->events_hi = sb->events_lo;
  78         sb->events_lo = t32;
  79
  80         t32 = sb->cp_events_hi;
  81         sb->cp_events_hi = sb->cp_events_lo;
  82         sb->cp_events_lo = t32;
  83
  84 }
  85
  86 #ifndef MDASSEMBLE
  87
  88 static void examine_super0(struct supertype *st, void *sbv, char *homehost)
  89 {
  90         mdp_super_t *sb = sbv;
  91         time_t atime;
  92         int d;
  93         char *c;
  94
  95         printf("          Magic : %08x\n", sb->md_magic);
  96         printf("        Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
  97                sb->patch_version);
  98         if (sb->minor_version >= 90) {
  99                 printf("           UUID : %08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 100                        sb->set_uuid2, sb->set_uuid3);
 101                 if (homehost) {
 102                         char buf[20];
 103                         void *hash = sha1_buffer(homehost,
 104                                                  strlen(homehost),
 105                                                  buf);
 106                         if (memcmp(&sb->set_uuid2, hash, 8)==0)
 107                                 printf(" (local to host %s)", homehost);
 108                 }
 109                 printf("\n");
 110         } else
 111                 printf("           UUID : %08x\n", sb->set_uuid0);
 112
 113         if (sb->not_persistent)
 114                 printf("           Eedk : not persistent\n");
 115
 116         atime = sb->ctime;
 117         printf("  Creation Time : %.24s\n", ctime(&atime));
 118         c=map_num(pers, sb->level);
 119         printf("     Raid Level : %s\n", c?c:"-unknown-");
 120         if ((int)sb->level >= 0) {
 121                 int ddsks=0;
 122                 printf("  Used Dev Size : %d%s\n", sb->size,
 123                        human_size((long long)sb->size<<10));
 124                 switch(sb->level) {
 125                 case 1: ddsks=1;break;
 126                 case 4:
 127                 case 5: ddsks = sb->raid_disks-1; break;
 128                 case 6: ddsks = sb->raid_disks-2; break;
 129                 case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
 130                 }
 131                 if (ddsks)
 132                         printf("     Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
 133                                human_size(ddsks*(long long)sb->size<<10));
 134         }
 135         printf("   Raid Devices : %d\n", sb->raid_disks);
 136         printf("  Total Devices : %d\n", sb->nr_disks);
 137         printf("Preferred Minor : %d\n", sb->md_minor);
 138         printf("\n");
 139         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 140                 printf("  Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
 141                 if (sb->delta_disks) {
 142                         printf("  Delta Devices : %d", sb->delta_disks);
 143                         if (sb->delta_disks)
 144                                 printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
 145                         else
 146                                 printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
 147                 }
 148                 if (sb->new_level != sb->level) {
 149                         c = map_num(pers, sb->new_level);
 150                         printf("      New Level : %s\n", c?c:"-unknown-");
 151                 }
 152                 if (sb->new_layout != sb->layout) {
 153                         if (sb->level == 5) {
 154                                 c = map_num(r5layout, sb->new_layout);
 155                                 printf("     New Layout : %s\n", c?c:"-unknown-");
 156                         }
 157                         if (sb->level == 10) {
 158                                 printf("     New Layout : near=%d, %s=%d\n",
 159                                        sb->new_layout&255,
 160                                        (sb->new_layout&0x10000)?"offset":"far",
 161                                        (sb->new_layout>>8)&255);
 162                         }
 163                 }
 164                 if (sb->new_chunk != sb->chunk_size)
 165                         printf("  New Chunksize : %d\n", sb->new_chunk);
 166                 printf("\n");
 167         }
 168         atime = sb->utime;
 169         printf("    Update Time : %.24s\n", ctime(&atime));
 170         printf("          State : %s\n",
 171                (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
 172         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
 173                 printf("Internal Bitmap : present\n");
 174         printf(" Active Devices : %d\n", sb->active_disks);
 175         printf("Working Devices : %d\n", sb->working_disks);
 176         printf(" Failed Devices : %d\n", sb->failed_disks);
 177         printf("  Spare Devices : %d\n", sb->spare_disks);
 178         if (calc_sb0_csum(sb) == sb->sb_csum)
 179                 printf("       Checksum : %x - correct\n", sb->sb_csum);
 180         else
 181                 printf("       Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
 182         printf("         Events : %d.%d\n", sb->events_hi, sb->events_lo);
 183         printf("\n");
 184         if (sb->level == 5) {
 185                 c = map_num(r5layout, sb->layout);
 186                 printf("         Layout : %s\n", c?c:"-unknown-");
 187         }
 188         if (sb->level == 10) {
 189                 printf("         Layout : near=%d, %s=%d\n",
 190                        sb->layout&255,
 191                        (sb->layout&0x10000)?"offset":"far",
 192                        (sb->layout>>8)&255);
 193         }
 194         switch(sb->level) {
 195         case 0:
 196         case 4:
 197         case 5:
 198         case 6:
 199         case 10:
 200                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 201                 break;
 202         case -1:
 203                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 204                 break;
 205         default: break;
 206         }
 207         printf("\n");
 208         printf("      Number   Major   Minor   RaidDevice State\n");
 209         for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
 210                 mdp_disk_t *dp;
 211                 char *dv;
 212                 char nb[5];
 213                 int wonly;
 214                 if (d>=0) dp = &sb->disks[d];
 215                 else dp = &sb->this_disk;
 216                 snprintf(nb, sizeof(nb), "%4d", d);
 217                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 218                        dp->number, dp->major, dp->minor, dp->raid_disk);
 219                 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
 220                 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 221                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 222                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 223                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 224                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 225                 if (wonly) printf(" write-mostly");
 226                 if (dp->state == 0) printf(" spare");
 227                 if ((dv=map_dev(dp->major, dp->minor, 0)))
 228                         printf("   %s", dv);
 229                 printf("\n");
 230                 if (d == -1) printf("\n");
 231         }
 232 }
 233
 234 static void brief_examine_super0(struct supertype *st, void *sbv)
 235 {
 236         mdp_super_t *sb = sbv;
 237         char *c=map_num(pers, sb->level);
 238         char devname[20];
 239
 240         sprintf(devname, "/dev/md%d", sb->md_minor);
 241
 242         printf("ARRAY %s level=%s num-devices=%d UUID=",
 243                devname,
 244                c?c:"-unknown-", sb->raid_disks);
 245         if (sb->minor_version >= 90)
 246                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 247                        sb->set_uuid2, sb->set_uuid3);
 248         else
 249                 printf("%08x", sb->set_uuid0);
 250         printf("\n");
 251 }
 252
 253 static void detail_super0(struct supertype *st, void *sbv, char *homehost)
 254 {
 255         mdp_super_t *sb = sbv;
 256         printf("           UUID : ");
 257         if (sb->minor_version >= 90)
 258                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 259                        sb->set_uuid2, sb->set_uuid3);
 260         else
 261                 printf("%08x", sb->set_uuid0);
 262         if (homehost) {
 263                 char buf[20];
 264                 void *hash = sha1_buffer(homehost,
 265                                          strlen(homehost),
 266                                          buf);
 267                 if (memcmp(&sb->set_uuid2, hash, 8)==0)
 268                         printf(" (local to host %s)", homehost);
 269         }
 270         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 271 }
 272
 273 static void brief_detail_super0(struct supertype *st, void *sbv)
 274 {
 275         mdp_super_t *sb = sbv;
 276         printf(" UUID=");
 277         if (sb->minor_version >= 90)
 278                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 279                        sb->set_uuid2, sb->set_uuid3);
 280         else
 281                 printf("%08x", sb->set_uuid0);
 282 }
 283
 284 static void export_super0(struct supertype *st, void *sbv)
 285 {
 286         mdp_super_t *sb = sbv;
 287         printf("MD_UUID=");
 288         if (sb->minor_version >= 90)
 289                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 290                        sb->set_uuid2, sb->set_uuid3);
 291         else
 292                 printf("%08x", sb->set_uuid0);
 293         printf("\n");
 294 }
 295 #endif
 296
 297 static int match_home0(struct supertype *st, void *sbv, char *homehost)
 298 {
 299         mdp_super_t *sb = sbv;
 300         char buf[20];
 301         char *hash = sha1_buffer(homehost,
 302                                  strlen(homehost),
 303                                  buf);
 304
 305         return (memcmp(&sb->set_uuid2, hash, 8)==0);
 306 }
 307
 308 static void uuid_from_super0(struct supertype *st, int uuid[4], void * sbv)
 309 {
 310         mdp_super_t *super = sbv;
 311         uuid[0] = super->set_uuid0;
 312         if (super->minor_version >= 90) {
 313                 uuid[1] = super->set_uuid1;
 314                 uuid[2] = super->set_uuid2;
 315                 uuid[3] = super->set_uuid3;
 316         } else {
 317                 uuid[1] = 0;
 318                 uuid[2] = 0;
 319                 uuid[3] = 0;
 320         }
 321 }
 322
 323 static void getinfo_super0(struct supertype *st, struct mdinfo *info, void *sbv)
 324 {
 325         mdp_super_t *sb = sbv;
 326         int working = 0;
 327         int i;
 328
 329         info->array.major_version = sb->major_version;
 330         info->array.minor_version = sb->minor_version;
 331         info->array.patch_version = sb->patch_version;
 332         info->array.raid_disks = sb->raid_disks;
 333         info->array.level = sb->level;
 334         info->array.layout = sb->layout;
 335         info->array.md_minor = sb->md_minor;
 336         info->array.ctime = sb->ctime;
 337         info->array.utime = sb->utime;
 338         info->array.chunk_size = sb->chunk_size;
 339         info->array.state = sb->state;
 340         info->component_size = sb->size*2;
 341
 342         info->disk.state = sb->this_disk.state;
 343         info->disk.major = sb->this_disk.major;
 344         info->disk.minor = sb->this_disk.minor;
 345         info->disk.raid_disk = sb->this_disk.raid_disk;
 346         info->disk.number = sb->this_disk.number;
 347
 348         info->events = md_event(sb);
 349         info->data_offset = 0;
 350
 351         uuid_from_super0(st, info->uuid, sbv);
 352
 353         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 354                 info->reshape_active = 1;
 355                 info->reshape_progress = sb->reshape_position;
 356                 info->new_level = sb->new_level;
 357                 info->delta_disks = sb->delta_disks;
 358                 info->new_layout = sb->new_layout;
 359                 info->new_chunk = sb->new_chunk;
 360         } else
 361                 info->reshape_active = 0;
 362
 363         sprintf(info->name, "%d", sb->md_minor);
 364         /* work_disks is calculated rather than read directly */
 365         for (i=0; i < MD_SB_DISKS; i++)
 366                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 367                     (sb->disks[i].raid_disk < info->array.raid_disks) &&
 368                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 369                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
 370                         working ++;
 371         info->array.working_disks = working;
 372 }
 373
 374
 375 static int update_super0(struct supertype *st, struct mdinfo *info,
 376                          void *sbv, char *update,
 377                          char *devname, int verbose,
 378                          int uuid_set, char *homehost)
 379 {
 380         /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
 381          * For others, the return value is ignored.
 382          */
 383         int rv = 0;
 384         mdp_super_t *sb = sbv;
 385         if (strcmp(update, "sparc2.2")==0 ) {
 386                 /* 2.2 sparc put the events in the wrong place
 387                  * So we copy the tail of the superblock
 388                  * up 4 bytes before continuing
 389                  */
 390                 __u32 *sb32 = (__u32*)sb;
 391                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 392                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 393                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 394                 if (verbose >= 0)
 395                         fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 396                                  devname);
 397         }
 398         if (strcmp(update, "super-minor") ==0) {
 399                 sb->md_minor = info->array.md_minor;
 400                 if (verbose > 0)
 401                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 402                                 devname, info->array.md_minor);
 403         }
 404         if (strcmp(update, "summaries") == 0) {
 405                 int i;
 406                 /* set nr_disks, active_disks, working_disks,
 407                  * failed_disks, spare_disks based on disks[]
 408                  * array in superblock.
 409                  * Also make sure extra slots aren't 'failed'
 410                  */
 411                 sb->nr_disks = sb->active_disks =
 412                         sb->working_disks = sb->failed_disks =
 413                         sb->spare_disks = 0;
 414                 for (i=0; i < MD_SB_DISKS ; i++)
 415                         if (sb->disks[i].major ||
 416                             sb->disks[i].minor) {
 417                                 int state = sb->disks[i].state;
 418                                 if (state & (1<<MD_DISK_REMOVED))
 419                                         continue;
 420                                 sb->nr_disks++;
 421                                 if (state & (1<<MD_DISK_ACTIVE))
 422                                         sb->active_disks++;
 423                                 if (state & (1<<MD_DISK_FAULTY))
 424                                         sb->failed_disks++;
 425                                 else
 426                                         sb->working_disks++;
 427                                 if (state == 0)
 428                                         sb->spare_disks++;
 429                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 430                                 sb->disks[i].state = 0;
 431         }
 432         if (strcmp(update, "force-one")==0) {
 433                 /* Not enough devices for a working array, so
 434                  * bring this one up-to-date.
 435                  */
 436                 __u32 ehi = sb->events_hi, elo = sb->events_lo;
 437                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 438                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 439                 if (sb->events_hi != ehi ||
 440                     sb->events_lo != elo)
 441                         rv = 1;
 442         }
 443         if (strcmp(update, "force-array")==0) {
 444                 /* degraded array and 'force' requested, so
 445                  * maybe need to mark it 'clean'
 446                  */
 447                 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
 448                     (sb->state & (1 << MD_SB_CLEAN)) == 0) {
 449                         /* need to force clean */
 450                         sb->state |= (1 << MD_SB_CLEAN);
 451                         rv = 1;
 452                 }
 453         }
 454         if (strcmp(update, "assemble")==0) {
 455                 int d = info->disk.number;
 456                 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
 457                 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
 458                     != info->disk.state) {
 459                         sb->disks[d].state = info->disk.state | wonly;
 460                         rv = 1;
 461                 }
 462         }
 463         if (strcmp(update, "linear-grow-new") == 0) {
 464                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 465                 sb->disks[info->disk.number].number = info->disk.number;
 466                 sb->disks[info->disk.number].major = info->disk.major;
 467                 sb->disks[info->disk.number].minor = info->disk.minor;
 468                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 469                 sb->disks[info->disk.number].state = info->disk.state;
 470                 sb->this_disk = sb->disks[info->disk.number];
 471         }
 472         if (strcmp(update, "linear-grow-update") == 0) {
 473                 sb->raid_disks = info->array.raid_disks;
 474                 sb->nr_disks = info->array.nr_disks;
 475                 sb->active_disks = info->array.active_disks;
 476                 sb->working_disks = info->array.working_disks;
 477                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 478                 sb->disks[info->disk.number].number = info->disk.number;
 479                 sb->disks[info->disk.number].major = info->disk.major;
 480                 sb->disks[info->disk.number].minor = info->disk.minor;
 481                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 482                 sb->disks[info->disk.number].state = info->disk.state;
 483         }
 484         if (strcmp(update, "resync") == 0) {
 485                 /* make sure resync happens */
 486                 sb->state &= ~(1<<MD_SB_CLEAN);
 487                 sb->recovery_cp = 0;
 488         }
 489         if (strcmp(update, "homehost") == 0 &&
 490             homehost) {
 491                 uuid_set = 0;
 492                 update = "uuid";
 493                 info->uuid[0] = sb->set_uuid0;
 494                 info->uuid[1] = sb->set_uuid1;
 495         }
 496         if (strcmp(update, "uuid") == 0) {
 497                 if (!uuid_set && homehost) {
 498                         char buf[20];
 499                         char *hash = sha1_buffer(homehost,
 500                                                  strlen(homehost),
 501                                                  buf);
 502                         memcpy(info->uuid+2, hash, 8);
 503                 }
 504                 sb->set_uuid0 = info->uuid[0];
 505                 sb->set_uuid1 = info->uuid[1];
 506                 sb->set_uuid2 = info->uuid[2];
 507                 sb->set_uuid3 = info->uuid[3];
 508                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
 509                         struct bitmap_super_s *bm;
 510                         bm = (struct bitmap_super_s*)(sb+1);
 511                         uuid_from_super0(st, (int*)bm->uuid, sbv);
 512                 }
 513         }
 514         if (strcmp(update, "_reshape_progress")==0)
 515                 sb->reshape_position = info->reshape_progress;
 516
 517         sb->sb_csum = calc_sb0_csum(sb);
 518         return rv;
 519 }
 520
 521 /*
 522  * For verion-0 superblock, the homehost is 'stored' in the
 523  * uuid.  8 bytes for a hash of the host leaving 8 bytes
 524  * of random material.
 525  * We use the first 8 bytes (64bits) of the sha1 of the
 526  * host name
 527  */
 528
 529
 530 static int init_super0(struct supertype *st, void **sbp, mdu_array_info_t *info,
 531                        unsigned long long size, char *ignored_name, char *homehost,
 532                        int *uuid)
 533 {
 534         mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 535         int spares;
 536         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 537
 538         if (info->major_version == -1) {
 539                 /* zeroing the superblock */
 540                 *sbp = sb;
 541                 return 0;
 542         }
 543
 544         spares = info->working_disks - info->active_disks;
 545         if (info->raid_disks + spares  > MD_SB_DISKS) {
 546                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 547                         info->raid_disks , spares, MD_SB_DISKS);
 548                 return 0;
 549         }
 550
 551         sb->md_magic = MD_SB_MAGIC;
 552         sb->major_version = 0;
 553         sb->minor_version = 90;
 554         sb->patch_version = 0;
 555         sb->gvalid_words = 0; /* ignored */
 556         sb->ctime = time(0);
 557         sb->level = info->level;
 558         if (size != info->size)
 559                 return 0;
 560         sb->size = info->size;
 561         sb->nr_disks = info->nr_disks;
 562         sb->raid_disks = info->raid_disks;
 563         sb->md_minor = info->md_minor;
 564         sb->not_persistent = 0;
 565         if (uuid) {
 566                 sb->set_uuid0 = uuid[0];
 567                 sb->set_uuid1 = uuid[1];
 568                 sb->set_uuid2 = uuid[2];
 569                 sb->set_uuid3 = uuid[3];
 570         } else {
 571                 int rfd = open("/dev/urandom", O_RDONLY);
 572                 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 573                         sb->set_uuid0 = random();
 574                 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 575                         sb->set_uuid1 = random();
 576                         sb->set_uuid2 = random();
 577                         sb->set_uuid3 = random();
 578                 }
 579                 if (rfd >= 0)
 580                         close(rfd);
 581         }
 582         if (homehost) {
 583                 char buf[20];
 584                 char *hash = sha1_buffer(homehost,
 585                                          strlen(homehost),
 586                                          buf);
 587                 memcpy(&sb->set_uuid2, hash, 8);
 588         }
 589
 590         sb->utime = sb->ctime;
 591         sb->state = info->state;
 592         sb->active_disks = info->active_disks;
 593         sb->working_disks = info->working_disks;
 594         sb->failed_disks = info->failed_disks;
 595         sb->spare_disks = info->spare_disks;
 596         sb->events_hi = 0;
 597         sb->events_lo = 1;
 598
 599         sb->layout = info->layout;
 600         sb->chunk_size = info->chunk_size;
 601
 602         *sbp = sb;
 603         return 1;
 604 }
 605
 606 /* Add a device to the superblock being created */
 607 static void add_to_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo)
 608 {
 609         mdp_super_t *sb = sbv;
 610         mdp_disk_t *dk = &sb->disks[dinfo->number];
 611
 612         dk->number = dinfo->number;
 613         dk->major = dinfo->major;
 614         dk->minor = dinfo->minor;
 615         dk->raid_disk = dinfo->raid_disk;
 616         dk->state = dinfo->state;
 617 }
 618
 619 static int store_super0(struct supertype *st, int fd, void *sbv)
 620 {
 621         unsigned long long dsize;
 622         unsigned long long offset;
 623         mdp_super_t *super = sbv;
 624
 625         if (!get_dev_size(fd, NULL, &dsize))
 626                 return 1;
 627
 628         if (dsize < MD_RESERVED_SECTORS*512)
 629                 return 2;
 630
 631         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 632
 633         offset *= 512;
 634
 635         if (lseek64(fd, offset, 0)< 0LL)
 636                 return 3;
 637
 638         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 639                 return 4;
 640
 641         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 642                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 643                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
 644                         if (write(fd, bm, sizeof(*bm)) != sizeof(*bm))
 645                             return 5;
 646         }
 647
 648         fsync(fd);
 649         return 0;
 650 }
 651
 652 static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
 653 {
 654         mdp_super_t *sb = sbv;
 655         int fd = open(devname, O_RDWR|O_EXCL);
 656         int rv;
 657
 658         if (fd < 0) {
 659                 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
 660                 return -1;
 661         }
 662
 663         sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
 664
 665         sb->this_disk = sb->disks[dinfo->number];
 666         sb->sb_csum = calc_sb0_csum(sb);
 667         rv = store_super0(st, fd, sb);
 668
 669         if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 670                 rv = st->ss->write_bitmap(st, fd, sbv);
 671
 672         close(fd);
 673         if (rv)
 674                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
 675         return rv;
 676 }
 677
 678 static int compare_super0(void **firstp, void *secondv)
 679 {
 680         /*
 681          * return:
 682          *  0 same, or first was empty, and second was copied
 683          *  1 second had wrong number
 684          *  2 wrong uuid
 685          *  3 wrong other info
 686          */
 687         mdp_super_t *first = *firstp;
 688         mdp_super_t *second = secondv;
 689
 690         int uuid1[4], uuid2[4];
 691         if (second->md_magic != MD_SB_MAGIC)
 692                 return 1;
 693         if (!first) {
 694                 first = malloc(MD_SB_BYTES + sizeof(struct bitmap_super_s));
 695                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 696                 *firstp = first;
 697                 return 0;
 698         }
 699
 700         uuid_from_super0(NULL, uuid1, first);
 701         uuid_from_super0(NULL, uuid2, second);
 702         if (!same_uuid(uuid1, uuid2, 0))
 703                 return 2;
 704         if (first->major_version != second->major_version ||
 705             first->minor_version != second->minor_version ||
 706             first->patch_version != second->patch_version ||
 707             first->gvalid_words  != second->gvalid_words  ||
 708             first->ctime         != second->ctime         ||
 709             first->level         != second->level         ||
 710             first->size          != second->size          ||
 711             first->raid_disks    != second->raid_disks    )
 712                 return 3;
 713
 714         return 0;
 715 }
 716
 717
 718 static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
 719 {
 720         /* try to read in the superblock
 721          * Return:
 722          *  0 on success
 723          *  1 on cannot get superblock
 724          *  2 on superblock meaningless
 725          */
 726         unsigned long long dsize;
 727         unsigned long long offset;
 728         mdp_super_t *super;
 729         int uuid[4];
 730         struct bitmap_super_s *bsb;
 731
 732         if (!get_dev_size(fd, devname, &dsize))
 733                 return 1;
 734
 735         if (dsize < MD_RESERVED_SECTORS*512) {
 736                 if (devname)
 737                         fprintf(stderr, Name
 738                             ": %s is too small for md: size is %llu sectors.\n",
 739                                 devname, dsize);
 740                 return 1;
 741         }
 742
 743         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 744
 745         offset *= 512;
 746
 747         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 748
 749         if (lseek64(fd, offset, 0)< 0LL) {
 750                 if (devname)
 751                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 752                                 devname, strerror(errno));
 753                 return 1;
 754         }
 755
 756         super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 757
 758         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 759                 if (devname)
 760                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 761                                 devname);
 762                 free(super);
 763                 return 1;
 764         }
 765
 766         if (st->ss && st->minor_version == 9)
 767                 super0_swap_endian(super);
 768
 769         if (super->md_magic != MD_SB_MAGIC) {
 770                 if (devname)
 771                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 772                                 devname, MD_SB_MAGIC, super->md_magic);
 773                 free(super);
 774                 return 2;
 775         }
 776
 777         if (super->major_version != 0) {
 778                 if (devname)
 779                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 780                                 devname, super->major_version);
 781                 free(super);
 782                 return 2;
 783         }
 784         *sbp = super;
 785         if (st->ss == NULL) {
 786                 st->ss = &super0;
 787                 st->minor_version = 90;
 788                 st->max_devs = MD_SB_DISKS;
 789         }
 790
 791         /* Now check on the bitmap superblock */
 792         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
 793                 return 0;
 794         /* Read the bitmap superblock and make sure it looks
 795          * valid.  If it doesn't clear the bit.  An --assemble --force
 796          * should get that written out.
 797          */
 798         if (read(fd, super+1, sizeof(struct bitmap_super_s))
 799             != sizeof(struct bitmap_super_s))
 800                 goto no_bitmap;
 801
 802         uuid_from_super0(st, uuid, super);
 803         bsb = (struct bitmap_super_s *)(super+1);
 804         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
 805             memcmp(bsb->uuid, uuid, 16) != 0)
 806                 goto no_bitmap;
 807         return 0;
 808
 809  no_bitmap:
 810         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
 811
 812         return 0;
 813 }
 814
 815 static struct supertype *match_metadata_desc0(char *arg)
 816 {
 817         struct supertype *st = malloc(sizeof(*st));
 818         if (!st) return st;
 819
 820         st->ss = &super0;
 821         st->minor_version = 90;
 822         st->max_devs = MD_SB_DISKS;
 823         if (strcmp(arg, "0") == 0 ||
 824             strcmp(arg, "0.90") == 0 ||
 825             strcmp(arg, "default") == 0
 826                 )
 827                 return st;
 828
 829         st->minor_version = 9; /* flag for 'byte-swapped' */
 830         if (strcmp(arg, "0.swap")==0)
 831                 return st;
 832
 833         free(st);
 834         return NULL;
 835 }
 836
 837 static __u64 avail_size0(struct supertype *st, __u64 devsize)
 838 {
 839         if (devsize < MD_RESERVED_SECTORS)
 840                 return 0ULL;
 841         return MD_NEW_SIZE_SECTORS(devsize);
 842 }
 843
 844 static int add_internal_bitmap0(struct supertype *st, void *sbv, int *chunkp,
 845                                 int delay, int write_behind,
 846                                 unsigned long long size, int may_change,
 847                                 int major)
 848 {
 849         /*
 850          * The bitmap comes immediately after the superblock and must be 60K in size
 851          * at most.  The default size is between 30K and 60K
 852          *
 853          * size is in sectors,  chunk is in bytes !!!
 854          */
 855         unsigned long long bits;
 856         unsigned long long max_bits = 60*1024*8;
 857         unsigned long long min_chunk;
 858         int chunk = *chunkp;
 859         mdp_super_t *sb = sbv;
 860         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
 861
 862
 863         min_chunk = 4096; /* sub-page chunks don't work yet.. */
 864         bits = (size * 512) / min_chunk + 1;
 865         while (bits > max_bits) {
 866                 min_chunk *= 2;
 867                 bits = (bits+1)/2;
 868         }
 869         if (chunk == UnSet)
 870                 chunk = min_chunk;
 871         else if (chunk < min_chunk)
 872                 return 0; /* chunk size too small */
 873
 874         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 875
 876         memset(bms, 0, sizeof(*bms));
 877         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
 878         bms->version = __cpu_to_le32(major);
 879         uuid_from_super0(st, (int*)bms->uuid, sb);
 880         bms->chunksize = __cpu_to_le32(chunk);
 881         bms->daemon_sleep = __cpu_to_le32(delay);
 882         bms->sync_size = __cpu_to_le64(size);
 883         bms->write_behind = __cpu_to_le32(write_behind);
 884         *chunkp = chunk;
 885         return 1;
 886 }
 887
 888
 889 void locate_bitmap0(struct supertype *st, int fd, void *sbv)
 890 {
 891         unsigned long long dsize;
 892         unsigned long long offset;
 893
 894         if (!get_dev_size(fd, NULL, &dsize))
 895                 return;
 896
 897         if (dsize < MD_RESERVED_SECTORS*512)
 898                 return;
 899
 900         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 901
 902         offset *= 512;
 903
 904         offset += MD_SB_BYTES;
 905
 906         lseek64(fd, offset, 0);
 907 }
 908
 909 int write_bitmap0(struct supertype *st, int fd, void *sbv)
 910 {
 911         unsigned long long dsize;
 912         unsigned long long offset;
 913         mdp_super_t *sb = sbv;
 914
 915         int rv = 0;
 916
 917         int towrite, n;
 918         char buf[4096];
 919
 920         if (!get_dev_size(fd, NULL, &dsize))
 921                 return 1;
 922
 923
 924         if (dsize < MD_RESERVED_SECTORS*512)
 925                 return -1;
 926
 927         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 928
 929         offset *= 512;
 930
 931         if (lseek64(fd, offset + 4096, 0)< 0LL)
 932                 return 3;
 933
 934
 935         if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
 936             sizeof(bitmap_super_t))
 937                 return -2;
 938         towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
 939         memset(buf, 0xff, sizeof(buf));
 940         while (towrite > 0) {
 941                 n = towrite;
 942                 if (n > sizeof(buf))
 943                         n = sizeof(buf);
 944                 n = write(fd, buf, n);
 945                 if (n > 0)
 946                         towrite -= n;
 947                 else
 948                         break;
 949         }
 950         fsync(fd);
 951         if (towrite)
 952                 rv = -2;
 953
 954         return rv;
 955 }
 956
 957 static void free_super0(struct supertype *st, void *super)
 958 {
 959         if (super)
 960                 free(super);
 961 }
 962
 963 struct superswitch super0 = {
 964 #ifndef MDASSEMBLE
 965         .examine_super = examine_super0,
 966         .brief_examine_super = brief_examine_super0,
 967         .detail_super = detail_super0,
 968         .brief_detail_super = brief_detail_super0,
 969         .export_super = export_super0,
 970 #endif
 971         .match_home = match_home0,
 972         .uuid_from_super = uuid_from_super0,
 973         .getinfo_super = getinfo_super0,
 974         .update_super = update_super0,
 975         .init_super = init_super0,
 976         .add_to_super = add_to_super0,
 977         .store_super = store_super0,
 978         .write_init_super = write_init_super0,
 979         .compare_super = compare_super0,
 980         .load_super = load_super0,
 981         .match_metadata_desc = match_metadata_desc0,
 982         .avail_size = avail_size0,
 983         .add_internal_bitmap = add_internal_bitmap0,
 984         .locate_bitmap = locate_bitmap0,
 985         .write_bitmap = write_bitmap0,
 986         .free_super = free_super0,
 987         .major = 0,
 988         .swapuuid = 0,
 989 };