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 static 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, char *homehost)
  89 {
  90         mdp_super_t *sb = st->sb;
  91         time_t atime;
  92         int d;
  93         char *c;
  94
  95         printf("          Magic : %08x\n", sb->md_magic);
  96         printf("        Version : %d.%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 : %llu\n",
 183                ((unsigned long long)sb->events_hi << 32)
 184                + sb->events_lo);
 185         printf("\n");
 186         if (sb->level == 5) {
 187                 c = map_num(r5layout, sb->layout);
 188                 printf("         Layout : %s\n", c?c:"-unknown-");
 189         }
 190         if (sb->level == 10) {
 191                 printf("         Layout :");
 192                 print_r10_layout(sb->layout);
 193                 printf("\n");
 194         }
 195         switch(sb->level) {
 196         case 0:
 197         case 4:
 198         case 5:
 199         case 6:
 200         case 10:
 201                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 202                 break;
 203         case -1:
 204                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 205                 break;
 206         default: break;
 207         }
 208         printf("\n");
 209         printf("      Number   Major   Minor   RaidDevice State\n");
 210         for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
 211                 mdp_disk_t *dp;
 212                 char *dv;
 213                 char nb[5];
 214                 int wonly;
 215                 if (d>=0) dp = &sb->disks[d];
 216                 else dp = &sb->this_disk;
 217                 snprintf(nb, sizeof(nb), "%4d", d);
 218                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 219                        dp->number, dp->major, dp->minor, dp->raid_disk);
 220                 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
 221                 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 222                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 223                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 224                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 225                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 226                 if (wonly) printf(" write-mostly");
 227                 if (dp->state == 0) printf(" spare");
 228                 if ((dv=map_dev(dp->major, dp->minor, 0)))
 229                         printf("   %s", dv);
 230                 printf("\n");
 231                 if (d == -1) printf("\n");
 232         }
 233 }
 234
 235 static void brief_examine_super0(struct supertype *st)
 236 {
 237         mdp_super_t *sb = st->sb;
 238         char *c=map_num(pers, sb->level);
 239         char devname[20];
 240
 241         sprintf(devname, "/dev/md%d", sb->md_minor);
 242
 243         printf("ARRAY %s level=%s num-devices=%d UUID=",
 244                devname,
 245                c?c:"-unknown-", sb->raid_disks);
 246         if (sb->minor_version >= 90)
 247                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 248                        sb->set_uuid2, sb->set_uuid3);
 249         else
 250                 printf("%08x", sb->set_uuid0);
 251         printf("\n");
 252 }
 253
 254 static void export_examine_super0(struct supertype *st)
 255 {
 256         mdp_super_t *sb = st->sb;
 257
 258         printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
 259         printf("MD_DEVICES=%d\n", sb->raid_disks);
 260         if (sb->minor_version >= 90)
 261                 printf("MD_UUID=%08x:%08x:%08x:%08x\n",
 262                        sb->set_uuid0, sb->set_uuid1,
 263                        sb->set_uuid2, sb->set_uuid3);
 264         else
 265                 printf("MD_UUID=%08x\n", sb->set_uuid0);
 266         printf("MD_UPDATE_TIME=%llu\n",
 267                __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
 268         printf("MD_EVENTS=%llu\n",
 269                ((unsigned long long)sb->events_hi << 32)
 270                + sb->events_lo);
 271 }
 272
 273 static void detail_super0(struct supertype *st, char *homehost)
 274 {
 275         mdp_super_t *sb = st->sb;
 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         if (homehost) {
 283                 char buf[20];
 284                 void *hash = sha1_buffer(homehost,
 285                                          strlen(homehost),
 286                                          buf);
 287                 if (memcmp(&sb->set_uuid2, hash, 8)==0)
 288                         printf(" (local to host %s)", homehost);
 289         }
 290         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 291 }
 292
 293 static void brief_detail_super0(struct supertype *st)
 294 {
 295         mdp_super_t *sb = st->sb;
 296         printf(" UUID=");
 297         if (sb->minor_version >= 90)
 298                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 299                        sb->set_uuid2, sb->set_uuid3);
 300         else
 301                 printf("%08x", sb->set_uuid0);
 302 }
 303 #endif
 304
 305 static int match_home0(struct supertype *st, char *homehost)
 306 {
 307         mdp_super_t *sb = st->sb;
 308         char buf[20];
 309         char *hash = sha1_buffer(homehost,
 310                                  strlen(homehost),
 311                                  buf);
 312
 313         return (memcmp(&sb->set_uuid2, hash, 8)==0);
 314 }
 315
 316 static void uuid_from_super0(struct supertype *st, int uuid[4])
 317 {
 318         mdp_super_t *super = st->sb;
 319         uuid[0] = super->set_uuid0;
 320         if (super->minor_version >= 90) {
 321                 uuid[1] = super->set_uuid1;
 322                 uuid[2] = super->set_uuid2;
 323                 uuid[3] = super->set_uuid3;
 324         } else {
 325                 uuid[1] = 0;
 326                 uuid[2] = 0;
 327                 uuid[3] = 0;
 328         }
 329 }
 330
 331 static void getinfo_super0(struct supertype *st, struct mdinfo *info)
 332 {
 333         mdp_super_t *sb = st->sb;
 334         int working = 0;
 335         int i;
 336
 337         info->array.major_version = sb->major_version;
 338         info->array.minor_version = sb->minor_version;
 339         info->array.patch_version = sb->patch_version;
 340         info->array.raid_disks = sb->raid_disks;
 341         info->array.level = sb->level;
 342         info->array.layout = sb->layout;
 343         info->array.md_minor = sb->md_minor;
 344         info->array.ctime = sb->ctime;
 345         info->array.utime = sb->utime;
 346         info->array.chunk_size = sb->chunk_size;
 347         info->array.state = sb->state;
 348         info->component_size = sb->size*2;
 349
 350         info->disk.state = sb->this_disk.state;
 351         info->disk.major = sb->this_disk.major;
 352         info->disk.minor = sb->this_disk.minor;
 353         info->disk.raid_disk = sb->this_disk.raid_disk;
 354         info->disk.number = sb->this_disk.number;
 355
 356         info->events = md_event(sb);
 357         info->data_offset = 0;
 358
 359         sprintf(info->text_version, "0.%d", sb->minor_version);
 360         info->safe_mode_delay = 200;
 361
 362         uuid_from_super0(st, info->uuid);
 363
 364         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 365                 info->reshape_active = 1;
 366                 info->reshape_progress = sb->reshape_position;
 367                 info->new_level = sb->new_level;
 368                 info->delta_disks = sb->delta_disks;
 369                 info->new_layout = sb->new_layout;
 370                 info->new_chunk = sb->new_chunk;
 371         } else
 372                 info->reshape_active = 0;
 373
 374         sprintf(info->name, "%d", sb->md_minor);
 375         /* work_disks is calculated rather than read directly */
 376         for (i=0; i < MD_SB_DISKS; i++)
 377                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 378                     (sb->disks[i].raid_disk < info->array.raid_disks) &&
 379                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 380                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
 381                         working ++;
 382         info->array.working_disks = working;
 383 }
 384
 385
 386 static int update_super0(struct supertype *st, struct mdinfo *info,
 387                          char *update,
 388                          char *devname, int verbose,
 389                          int uuid_set, char *homehost)
 390 {
 391         /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
 392          * For others, the return value is ignored.
 393          */
 394         int rv = 0;
 395         mdp_super_t *sb = st->sb;
 396         if (strcmp(update, "sparc2.2")==0 ) {
 397                 /* 2.2 sparc put the events in the wrong place
 398                  * So we copy the tail of the superblock
 399                  * up 4 bytes before continuing
 400                  */
 401                 __u32 *sb32 = (__u32*)sb;
 402                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 403                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 404                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 405                 if (verbose >= 0)
 406                         fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 407                                  devname);
 408         }
 409         if (strcmp(update, "super-minor") ==0) {
 410                 sb->md_minor = info->array.md_minor;
 411                 if (verbose > 0)
 412                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 413                                 devname, info->array.md_minor);
 414         }
 415         if (strcmp(update, "summaries") == 0) {
 416                 int i;
 417                 /* set nr_disks, active_disks, working_disks,
 418                  * failed_disks, spare_disks based on disks[]
 419                  * array in superblock.
 420                  * Also make sure extra slots aren't 'failed'
 421                  */
 422                 sb->nr_disks = sb->active_disks =
 423                         sb->working_disks = sb->failed_disks =
 424                         sb->spare_disks = 0;
 425                 for (i=0; i < MD_SB_DISKS ; i++)
 426                         if (sb->disks[i].major ||
 427                             sb->disks[i].minor) {
 428                                 int state = sb->disks[i].state;
 429                                 if (state & (1<<MD_DISK_REMOVED))
 430                                         continue;
 431                                 sb->nr_disks++;
 432                                 if (state & (1<<MD_DISK_ACTIVE))
 433                                         sb->active_disks++;
 434                                 if (state & (1<<MD_DISK_FAULTY))
 435                                         sb->failed_disks++;
 436                                 else
 437                                         sb->working_disks++;
 438                                 if (state == 0)
 439                                         sb->spare_disks++;
 440                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 441                                 sb->disks[i].state = 0;
 442         }
 443         if (strcmp(update, "force-one")==0) {
 444                 /* Not enough devices for a working array, so
 445                  * bring this one up-to-date.
 446                  */
 447                 __u32 ehi = sb->events_hi, elo = sb->events_lo;
 448                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 449                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 450                 if (sb->events_hi != ehi ||
 451                     sb->events_lo != elo)
 452                         rv = 1;
 453         }
 454         if (strcmp(update, "force-array")==0) {
 455                 /* degraded array and 'force' requested, so
 456                  * maybe need to mark it 'clean'
 457                  */
 458                 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
 459                     (sb->state & (1 << MD_SB_CLEAN)) == 0) {
 460                         /* need to force clean */
 461                         sb->state |= (1 << MD_SB_CLEAN);
 462                         rv = 1;
 463                 }
 464         }
 465         if (strcmp(update, "assemble")==0) {
 466                 int d = info->disk.number;
 467                 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
 468                 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
 469                     != info->disk.state) {
 470                         sb->disks[d].state = info->disk.state | wonly;
 471                         rv = 1;
 472                 }
 473         }
 474         if (strcmp(update, "linear-grow-new") == 0) {
 475                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 476                 sb->disks[info->disk.number].number = info->disk.number;
 477                 sb->disks[info->disk.number].major = info->disk.major;
 478                 sb->disks[info->disk.number].minor = info->disk.minor;
 479                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 480                 sb->disks[info->disk.number].state = info->disk.state;
 481                 sb->this_disk = sb->disks[info->disk.number];
 482         }
 483         if (strcmp(update, "linear-grow-update") == 0) {
 484                 sb->raid_disks = info->array.raid_disks;
 485                 sb->nr_disks = info->array.nr_disks;
 486                 sb->active_disks = info->array.active_disks;
 487                 sb->working_disks = info->array.working_disks;
 488                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 489                 sb->disks[info->disk.number].number = info->disk.number;
 490                 sb->disks[info->disk.number].major = info->disk.major;
 491                 sb->disks[info->disk.number].minor = info->disk.minor;
 492                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 493                 sb->disks[info->disk.number].state = info->disk.state;
 494         }
 495         if (strcmp(update, "resync") == 0) {
 496                 /* make sure resync happens */
 497                 sb->state &= ~(1<<MD_SB_CLEAN);
 498                 sb->recovery_cp = 0;
 499         }
 500         if (strcmp(update, "homehost") == 0 &&
 501             homehost) {
 502                 uuid_set = 0;
 503                 update = "uuid";
 504                 info->uuid[0] = sb->set_uuid0;
 505                 info->uuid[1] = sb->set_uuid1;
 506         }
 507         if (strcmp(update, "uuid") == 0) {
 508                 if (!uuid_set && homehost) {
 509                         char buf[20];
 510                         char *hash = sha1_buffer(homehost,
 511                                                  strlen(homehost),
 512                                                  buf);
 513                         memcpy(info->uuid+2, hash, 8);
 514                 }
 515                 sb->set_uuid0 = info->uuid[0];
 516                 sb->set_uuid1 = info->uuid[1];
 517                 sb->set_uuid2 = info->uuid[2];
 518                 sb->set_uuid3 = info->uuid[3];
 519                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
 520                         struct bitmap_super_s *bm;
 521                         bm = (struct bitmap_super_s*)(sb+1);
 522                         uuid_from_super0(st, (int*)bm->uuid);
 523                 }
 524         }
 525         if (strcmp(update, "_reshape_progress")==0)
 526                 sb->reshape_position = info->reshape_progress;
 527
 528         sb->sb_csum = calc_sb0_csum(sb);
 529         return rv;
 530 }
 531
 532 /*
 533  * For verion-0 superblock, the homehost is 'stored' in the
 534  * uuid.  8 bytes for a hash of the host leaving 8 bytes
 535  * of random material.
 536  * We use the first 8 bytes (64bits) of the sha1 of the
 537  * host name
 538  */
 539
 540
 541 static int init_super0(struct supertype *st, mdu_array_info_t *info,
 542                        unsigned long long size, char *ignored_name, char *homehost,
 543                        int *uuid)
 544 {
 545         mdp_super_t *sb;
 546         int spares;
 547
 548         if (posix_memalign((void**)&sb, 512, MD_SB_BYTES + sizeof(bitmap_super_t)) != 0) {
 549                 fprintf(stderr, Name ": %s could not allocate superblock\n", __func__);
 550                 return 0;
 551         }
 552         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 553
 554         st->sb = sb;
 555         if (info == NULL) {
 556                 /* zeroing the superblock */
 557                 return 0;
 558         }
 559
 560         spares = info->working_disks - info->active_disks;
 561         if (info->raid_disks + spares  > MD_SB_DISKS) {
 562                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 563                         info->raid_disks , spares, MD_SB_DISKS);
 564                 return 0;
 565         }
 566
 567         sb->md_magic = MD_SB_MAGIC;
 568         sb->major_version = 0;
 569         sb->minor_version = 90;
 570         sb->patch_version = 0;
 571         sb->gvalid_words = 0; /* ignored */
 572         sb->ctime = time(0);
 573         sb->level = info->level;
 574         if (size != info->size)
 575                 return 0;
 576         sb->size = info->size;
 577         sb->nr_disks = info->nr_disks;
 578         sb->raid_disks = info->raid_disks;
 579         sb->md_minor = info->md_minor;
 580         sb->not_persistent = 0;
 581         if (uuid) {
 582                 sb->set_uuid0 = uuid[0];
 583                 sb->set_uuid1 = uuid[1];
 584                 sb->set_uuid2 = uuid[2];
 585                 sb->set_uuid3 = uuid[3];
 586         } else {
 587                 int rfd = open("/dev/urandom", O_RDONLY);
 588                 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 589                         sb->set_uuid0 = random();
 590                 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 591                         sb->set_uuid1 = random();
 592                         sb->set_uuid2 = random();
 593                         sb->set_uuid3 = random();
 594                 }
 595                 if (rfd >= 0)
 596                         close(rfd);
 597         }
 598         if (homehost) {
 599                 char buf[20];
 600                 char *hash = sha1_buffer(homehost,
 601                                          strlen(homehost),
 602                                          buf);
 603                 memcpy(&sb->set_uuid2, hash, 8);
 604         }
 605
 606         sb->utime = sb->ctime;
 607         sb->state = info->state;
 608         sb->active_disks = info->active_disks;
 609         sb->working_disks = info->working_disks;
 610         sb->failed_disks = info->failed_disks;
 611         sb->spare_disks = info->spare_disks;
 612         sb->events_hi = 0;
 613         sb->events_lo = 1;
 614
 615         sb->layout = info->layout;
 616         sb->chunk_size = info->chunk_size;
 617
 618         return 1;
 619 }
 620
 621 struct devinfo {
 622         int fd;
 623         char *devname;
 624         mdu_disk_info_t disk;
 625         struct devinfo *next;
 626 };
 627
 628 #ifndef MDASSEMBLE
 629 /* Add a device to the superblock being created */
 630 static void add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
 631                           int fd, char *devname)
 632 {
 633         mdp_super_t *sb = st->sb;
 634         mdp_disk_t *dk = &sb->disks[dinfo->number];
 635         struct devinfo *di, **dip;
 636
 637         dk->number = dinfo->number;
 638         dk->major = dinfo->major;
 639         dk->minor = dinfo->minor;
 640         dk->raid_disk = dinfo->raid_disk;
 641         dk->state = dinfo->state;
 642
 643         sb->this_disk = sb->disks[dinfo->number];
 644         sb->sb_csum = calc_sb0_csum(sb);
 645
 646         dip = (struct devinfo **)&st->info;
 647         while (*dip)
 648                 dip = &(*dip)->next;
 649         di = malloc(sizeof(struct devinfo));
 650         di->fd = fd;
 651         di->devname = devname;
 652         di->disk = *dinfo;
 653         di->next = NULL;
 654         *dip = di;
 655 }
 656 #endif
 657
 658 static int store_super0(struct supertype *st, int fd)
 659 {
 660         unsigned long long dsize;
 661         unsigned long long offset;
 662         mdp_super_t *super = st->sb;
 663
 664         if (!get_dev_size(fd, NULL, &dsize))
 665                 return 1;
 666
 667         if (dsize < MD_RESERVED_SECTORS*512)
 668                 return 2;
 669
 670         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 671
 672         offset *= 512;
 673
 674         if (lseek64(fd, offset, 0)< 0LL)
 675                 return 3;
 676
 677         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 678                 return 4;
 679
 680         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 681                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 682                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
 683                         if (write(fd, bm, ROUND_UP(sizeof(*bm),512)) !=
 684                             ROUND_UP(sizeof(*bm),512))
 685                             return 5;
 686         }
 687
 688         fsync(fd);
 689         return 0;
 690 }
 691
 692 #ifndef MDASSEMBLE
 693 static int write_init_super0(struct supertype *st)
 694 {
 695         mdp_super_t *sb = st->sb;
 696         int rv = 0;
 697         struct devinfo *di;
 698
 699         for (di = st->info ; di && ! rv ; di = di->next) {
 700
 701                 if (di->disk.state == 1)
 702                         continue;
 703                 if (di->fd == -1)
 704                         continue;
 705                 Kill(di->devname, 0, 1, 1);
 706                 Kill(di->devname, 0, 1, 1);
 707
 708                 sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
 709
 710                 sb->this_disk = sb->disks[di->disk.number];
 711                 sb->sb_csum = calc_sb0_csum(sb);
 712                 rv = store_super0(st, di->fd);
 713
 714                 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 715                         rv = st->ss->write_bitmap(st, di->fd);
 716
 717                 if (rv)
 718                         fprintf(stderr,
 719                                 Name ": failed to write superblock to %s\n",
 720                                 di->devname);
 721                 close(di->fd);
 722                 di->fd = -1;
 723         }
 724         return rv;
 725 }
 726 #endif
 727
 728 static int compare_super0(struct supertype *st, struct supertype *tst)
 729 {
 730         /*
 731          * return:
 732          *  0 same, or first was empty, and second was copied
 733          *  1 second had wrong number
 734          *  2 wrong uuid
 735          *  3 wrong other info
 736          */
 737         mdp_super_t *first = st->sb;
 738         mdp_super_t *second = tst->sb;
 739         int uuid1[4], uuid2[4];
 740
 741         if (second->md_magic != MD_SB_MAGIC)
 742                 return 1;
 743         if (!first) {
 744                 if (posix_memalign((void**)&first, 512,
 745                                MD_SB_BYTES + sizeof(struct bitmap_super_s)) != 0) {
 746                         fprintf(stderr, Name
 747                                 ": %s could not allocate superblock\n", __func__);
 748                         return 1;
 749                 }
 750                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 751                 st->sb = first;
 752                 return 0;
 753         }
 754
 755         uuid_from_super0(st, uuid1);
 756         uuid_from_super0(tst, uuid2);
 757         if (!same_uuid(uuid1, uuid2, 0))
 758                 return 2;
 759         if (first->major_version != second->major_version ||
 760             first->minor_version != second->minor_version ||
 761             first->patch_version != second->patch_version ||
 762             first->gvalid_words  != second->gvalid_words  ||
 763             first->ctime         != second->ctime         ||
 764             first->level         != second->level         ||
 765             first->size          != second->size          ||
 766             first->raid_disks    != second->raid_disks    )
 767                 return 3;
 768
 769         return 0;
 770 }
 771
 772
 773 static void free_super0(struct supertype *st);
 774
 775 static int load_super0(struct supertype *st, int fd, char *devname)
 776 {
 777         /* try to read in the superblock
 778          * Return:
 779          *  0 on success
 780          *  1 on cannot get superblock
 781          *  2 on superblock meaningless
 782          */
 783         unsigned long long dsize;
 784         unsigned long long offset;
 785         mdp_super_t *super;
 786         int uuid[4];
 787         struct bitmap_super_s *bsb;
 788
 789         free_super0(st);
 790
 791         if (st->subarray[0])
 792                 return 1;
 793
 794         if (!get_dev_size(fd, devname, &dsize))
 795                 return 1;
 796
 797         if (dsize < MD_RESERVED_SECTORS*512) {
 798                 if (devname)
 799                         fprintf(stderr, Name
 800                             ": %s is too small for md: size is %llu sectors.\n",
 801                                 devname, dsize);
 802                 return 1;
 803         }
 804
 805         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 806
 807         offset *= 512;
 808
 809         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 810
 811         if (lseek64(fd, offset, 0)< 0LL) {
 812                 if (devname)
 813                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 814                                 devname, strerror(errno));
 815                 return 1;
 816         }
 817
 818         if (posix_memalign((void**)&super, 512,
 819                            MD_SB_BYTES + sizeof(bitmap_super_t)+512) != 0) {
 820                 fprintf(stderr, Name
 821                         ": %s could not allocate superblock\n", __func__);
 822                 return 1;
 823         }
 824
 825         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 826                 if (devname)
 827                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 828                                 devname);
 829                 free(super);
 830                 return 1;
 831         }
 832
 833         if (st->ss && st->minor_version == 9)
 834                 super0_swap_endian(super);
 835
 836         if (super->md_magic != MD_SB_MAGIC) {
 837                 if (devname)
 838                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 839                                 devname, MD_SB_MAGIC, super->md_magic);
 840                 free(super);
 841                 return 2;
 842         }
 843
 844         if (super->major_version != 0) {
 845                 if (devname)
 846                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 847                                 devname, super->major_version);
 848                 free(super);
 849                 return 2;
 850         }
 851         st->sb = super;
 852
 853         if (st->ss == NULL) {
 854                 st->ss = &super0;
 855                 st->minor_version = super->minor_version;
 856                 st->max_devs = MD_SB_DISKS;
 857                 st->info = NULL;
 858         }
 859
 860         /* Now check on the bitmap superblock */
 861         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
 862                 return 0;
 863         /* Read the bitmap superblock and make sure it looks
 864          * valid.  If it doesn't clear the bit.  An --assemble --force
 865          * should get that written out.
 866          */
 867         if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),512))
 868             != ROUND_UP(sizeof(struct bitmap_super_s),512))
 869                 goto no_bitmap;
 870
 871         uuid_from_super0(st, uuid);
 872         bsb = (struct bitmap_super_s *)(super+1);
 873         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
 874             memcmp(bsb->uuid, uuid, 16) != 0)
 875                 goto no_bitmap;
 876         return 0;
 877
 878  no_bitmap:
 879         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
 880
 881         return 0;
 882 }
 883
 884 static struct supertype *match_metadata_desc0(char *arg)
 885 {
 886         struct supertype *st = malloc(sizeof(*st));
 887         if (!st) return st;
 888
 889         memset(st, 0, sizeof(*st));
 890         st->ss = &super0;
 891         st->info = NULL;
 892         st->minor_version = 90;
 893         st->max_devs = MD_SB_DISKS;
 894         st->sb = NULL;
 895         /* we sometimes get 00.90 */
 896         while (arg[0] == '0' && arg[1] == '0')
 897                 arg++;
 898         if (strcmp(arg, "0") == 0 ||
 899             strcmp(arg, "0.90") == 0 ||
 900             strcmp(arg, "default") == 0 ||
 901             strcmp(arg, "") == 0 /* no metadata */
 902                 )
 903                 return st;
 904
 905         st->minor_version = 91; /* reshape in progress */
 906         if (strcmp(arg, "0.91") == 0) /* For dup_super support */
 907                 return st;
 908
 909         st->minor_version = 9; /* flag for 'byte-swapped' */
 910         if (strcmp(arg, "0.swap")==0 ||
 911             strcmp(arg, "0.9") == 0) /* For dup_super support */
 912                 return st;
 913
 914         free(st);
 915         return NULL;
 916 }
 917
 918 static __u64 avail_size0(struct supertype *st, __u64 devsize)
 919 {
 920         if (devsize < MD_RESERVED_SECTORS)
 921                 return 0ULL;
 922         return MD_NEW_SIZE_SECTORS(devsize);
 923 }
 924
 925 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
 926                                 int delay, int write_behind,
 927                                 unsigned long long size, int may_change,
 928                                 int major)
 929 {
 930         /*
 931          * The bitmap comes immediately after the superblock and must be 60K in size
 932          * at most.  The default size is between 30K and 60K
 933          *
 934          * size is in sectors,  chunk is in bytes !!!
 935          */
 936         unsigned long long bits;
 937         unsigned long long max_bits = 60*1024*8;
 938         unsigned long long min_chunk;
 939         int chunk = *chunkp;
 940         mdp_super_t *sb = st->sb;
 941         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
 942
 943
 944         min_chunk = 4096; /* sub-page chunks don't work yet.. */
 945         bits = (size * 512) / min_chunk + 1;
 946         while (bits > max_bits) {
 947                 min_chunk *= 2;
 948                 bits = (bits+1)/2;
 949         }
 950         if (chunk == UnSet)
 951                 chunk = min_chunk;
 952         else if (chunk < min_chunk)
 953                 return 0; /* chunk size too small */
 954
 955         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 956
 957         memset(bms, 0, sizeof(*bms));
 958         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
 959         bms->version = __cpu_to_le32(major);
 960         uuid_from_super0(st, (int*)bms->uuid);
 961         bms->chunksize = __cpu_to_le32(chunk);
 962         bms->daemon_sleep = __cpu_to_le32(delay);
 963         bms->sync_size = __cpu_to_le64(size);
 964         bms->write_behind = __cpu_to_le32(write_behind);
 965         *chunkp = chunk;
 966         return 1;
 967 }
 968
 969
 970 static void locate_bitmap0(struct supertype *st, int fd)
 971 {
 972         unsigned long long dsize;
 973         unsigned long long offset;
 974
 975         if (!get_dev_size(fd, NULL, &dsize))
 976                 return;
 977
 978         if (dsize < MD_RESERVED_SECTORS*512)
 979                 return;
 980
 981         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 982
 983         offset *= 512;
 984
 985         offset += MD_SB_BYTES;
 986
 987         lseek64(fd, offset, 0);
 988 }
 989
 990 static int write_bitmap0(struct supertype *st, int fd)
 991 {
 992         unsigned long long dsize;
 993         unsigned long long offset;
 994         mdp_super_t *sb = st->sb;
 995
 996         int rv = 0;
 997
 998         int towrite, n;
 999         char abuf[4096+512];
1000         char *buf = (char*)(((long)(abuf+512))&~511UL);
1001
1002         if (!get_dev_size(fd, NULL, &dsize))
1003                 return 1;
1004
1005
1006         if (dsize < MD_RESERVED_SECTORS*512)
1007                 return -1;
1008
1009         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1010
1011         offset *= 512;
1012
1013         if (lseek64(fd, offset + 4096, 0)< 0LL)
1014                 return 3;
1015
1016         memset(buf, 0xff, 4096);
1017         memcpy(buf,  ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
1018         towrite = 64*1024;
1019         while (towrite > 0) {
1020                 n = towrite;
1021                 if (n > 4096)
1022                         n = 4096;
1023                 n = write(fd, buf, n);
1024                 if (n > 0)
1025                         towrite -= n;
1026                 else
1027                         break;
1028                 memset(buf, 0xff, 4096);
1029         }
1030         fsync(fd);
1031         if (towrite)
1032                 rv = -2;
1033
1034         return rv;
1035 }
1036
1037 static void free_super0(struct supertype *st)
1038 {
1039         if (st->sb)
1040                 free(st->sb);
1041         st->sb = NULL;
1042 }
1043
1044 #ifndef MDASSEMBLE
1045 static int validate_geometry0(struct supertype *st, int level,
1046                               int layout, int raiddisks,
1047                               int chunk, unsigned long long size,
1048                               char *subdev, unsigned long long *freesize,
1049                               int verbose)
1050 {
1051         unsigned long long ldsize;
1052         int fd;
1053
1054         if (level == LEVEL_CONTAINER)
1055                 return 0;
1056         if (raiddisks > MD_SB_DISKS)
1057                 return 0;
1058         if (size > (0x7fffffffULL<<10))
1059                 return 0;
1060         if (!subdev)
1061                 return 1;
1062
1063         fd = open(subdev, O_RDONLY|O_EXCL, 0);
1064         if (fd < 0) {
1065                 if (verbose)
1066                         fprintf(stderr, Name ": super0.90 cannot open %s: %s\n",
1067                                 subdev, strerror(errno));
1068                 return 0;
1069         }
1070
1071         if (!get_dev_size(fd, subdev, &ldsize)) {
1072                 close(fd);
1073                 return 0;
1074         }
1075         close(fd);
1076
1077         if (ldsize < MD_RESERVED_SECTORS * 512)
1078                 return 0;
1079         if (size > (0x7fffffffULL<<10))
1080                 return 0;
1081         *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
1082         return 1;
1083 }
1084 #endif /* MDASSEMBLE */
1085
1086 struct superswitch super0 = {
1087 #ifndef MDASSEMBLE
1088         .examine_super = examine_super0,
1089         .brief_examine_super = brief_examine_super0,
1090         .export_examine_super = export_examine_super0,
1091         .detail_super = detail_super0,
1092         .brief_detail_super = brief_detail_super0,
1093         .write_init_super = write_init_super0,
1094         .validate_geometry = validate_geometry0,
1095         .add_to_super = add_to_super0,
1096 #endif
1097         .match_home = match_home0,
1098         .uuid_from_super = uuid_from_super0,
1099         .getinfo_super = getinfo_super0,
1100         .update_super = update_super0,
1101         .init_super = init_super0,
1102         .store_super = store_super0,
1103         .compare_super = compare_super0,
1104         .load_super = load_super0,
1105         .match_metadata_desc = match_metadata_desc0,
1106         .avail_size = avail_size0,
1107         .add_internal_bitmap = add_internal_bitmap0,
1108         .locate_bitmap = locate_bitmap0,
1109         .write_bitmap = write_bitmap0,
1110         .free_super = free_super0,
1111 };