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, 4096,
 549                            MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
 550                 fprintf(stderr, Name ": %s could not allocate superblock\n", __func__);
 551                 return 0;
 552         }
 553         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 554
 555         st->sb = sb;
 556         if (info == NULL) {
 557                 /* zeroing the superblock */
 558                 return 0;
 559         }
 560
 561         spares = info->working_disks - info->active_disks;
 562         if (info->raid_disks + spares  > MD_SB_DISKS) {
 563                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 564                         info->raid_disks , spares, MD_SB_DISKS);
 565                 return 0;
 566         }
 567
 568         sb->md_magic = MD_SB_MAGIC;
 569         sb->major_version = 0;
 570         sb->minor_version = 90;
 571         sb->patch_version = 0;
 572         sb->gvalid_words = 0; /* ignored */
 573         sb->ctime = time(0);
 574         sb->level = info->level;
 575         if (size != info->size)
 576                 return 0;
 577         sb->size = info->size;
 578         sb->nr_disks = info->nr_disks;
 579         sb->raid_disks = info->raid_disks;
 580         sb->md_minor = info->md_minor;
 581         sb->not_persistent = 0;
 582         if (uuid) {
 583                 sb->set_uuid0 = uuid[0];
 584                 sb->set_uuid1 = uuid[1];
 585                 sb->set_uuid2 = uuid[2];
 586                 sb->set_uuid3 = uuid[3];
 587         } else {
 588                 int rfd = open("/dev/urandom", O_RDONLY);
 589                 if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 590                         sb->set_uuid0 = random();
 591                 if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 592                         sb->set_uuid1 = random();
 593                         sb->set_uuid2 = random();
 594                         sb->set_uuid3 = random();
 595                 }
 596                 if (rfd >= 0)
 597                         close(rfd);
 598         }
 599         if (homehost) {
 600                 char buf[20];
 601                 char *hash = sha1_buffer(homehost,
 602                                          strlen(homehost),
 603                                          buf);
 604                 memcpy(&sb->set_uuid2, hash, 8);
 605         }
 606
 607         sb->utime = sb->ctime;
 608         sb->state = info->state;
 609         sb->active_disks = info->active_disks;
 610         sb->working_disks = info->working_disks;
 611         sb->failed_disks = info->failed_disks;
 612         sb->spare_disks = info->spare_disks;
 613         sb->events_hi = 0;
 614         sb->events_lo = 1;
 615
 616         sb->layout = info->layout;
 617         sb->chunk_size = info->chunk_size;
 618
 619         return 1;
 620 }
 621
 622 struct devinfo {
 623         int fd;
 624         char *devname;
 625         mdu_disk_info_t disk;
 626         struct devinfo *next;
 627 };
 628
 629 #ifndef MDASSEMBLE
 630 /* Add a device to the superblock being created */
 631 static int add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
 632                           int fd, char *devname)
 633 {
 634         mdp_super_t *sb = st->sb;
 635         mdp_disk_t *dk = &sb->disks[dinfo->number];
 636         struct devinfo *di, **dip;
 637
 638         dk->number = dinfo->number;
 639         dk->major = dinfo->major;
 640         dk->minor = dinfo->minor;
 641         dk->raid_disk = dinfo->raid_disk;
 642         dk->state = dinfo->state;
 643
 644         sb->this_disk = sb->disks[dinfo->number];
 645         sb->sb_csum = calc_sb0_csum(sb);
 646
 647         dip = (struct devinfo **)&st->info;
 648         while (*dip)
 649                 dip = &(*dip)->next;
 650         di = malloc(sizeof(struct devinfo));
 651         di->fd = fd;
 652         di->devname = devname;
 653         di->disk = *dinfo;
 654         di->next = NULL;
 655         *dip = di;
 656
 657         return 0;
 658 }
 659 #endif
 660
 661 static int store_super0(struct supertype *st, int fd)
 662 {
 663         unsigned long long dsize;
 664         unsigned long long offset;
 665         mdp_super_t *super = st->sb;
 666
 667         if (!get_dev_size(fd, NULL, &dsize))
 668                 return 1;
 669
 670         if (dsize < MD_RESERVED_SECTORS*512)
 671                 return 2;
 672
 673         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 674
 675         offset *= 512;
 676
 677         if (lseek64(fd, offset, 0)< 0LL)
 678                 return 3;
 679
 680         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 681                 return 4;
 682
 683         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 684                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 685                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
 686                         if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
 687                             ROUND_UP(sizeof(*bm),4096))
 688                             return 5;
 689         }
 690
 691         fsync(fd);
 692         return 0;
 693 }
 694
 695 #ifndef MDASSEMBLE
 696 static int write_init_super0(struct supertype *st)
 697 {
 698         mdp_super_t *sb = st->sb;
 699         int rv = 0;
 700         struct devinfo *di;
 701
 702         for (di = st->info ; di && ! rv ; di = di->next) {
 703
 704                 if (di->disk.state == 1)
 705                         continue;
 706                 if (di->fd == -1)
 707                         continue;
 708                 Kill(di->devname, 0, 1, 1);
 709                 Kill(di->devname, 0, 1, 1);
 710
 711                 sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
 712
 713                 sb->this_disk = sb->disks[di->disk.number];
 714                 sb->sb_csum = calc_sb0_csum(sb);
 715                 rv = store_super0(st, di->fd);
 716
 717                 if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 718                         rv = st->ss->write_bitmap(st, di->fd);
 719
 720                 if (rv)
 721                         fprintf(stderr,
 722                                 Name ": failed to write superblock to %s\n",
 723                                 di->devname);
 724                 close(di->fd);
 725                 di->fd = -1;
 726         }
 727         return rv;
 728 }
 729 #endif
 730
 731 static int compare_super0(struct supertype *st, struct supertype *tst)
 732 {
 733         /*
 734          * return:
 735          *  0 same, or first was empty, and second was copied
 736          *  1 second had wrong number
 737          *  2 wrong uuid
 738          *  3 wrong other info
 739          */
 740         mdp_super_t *first = st->sb;
 741         mdp_super_t *second = tst->sb;
 742         int uuid1[4], uuid2[4];
 743
 744         if (second->md_magic != MD_SB_MAGIC)
 745                 return 1;
 746         if (!first) {
 747                 if (posix_memalign((void**)&first, 4096,
 748                              MD_SB_BYTES +
 749                              ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
 750                         fprintf(stderr, Name
 751                                 ": %s could not allocate superblock\n", __func__);
 752                         return 1;
 753                 }
 754                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 755                 st->sb = first;
 756                 return 0;
 757         }
 758
 759         uuid_from_super0(st, uuid1);
 760         uuid_from_super0(tst, uuid2);
 761         if (!same_uuid(uuid1, uuid2, 0))
 762                 return 2;
 763         if (first->major_version != second->major_version ||
 764             first->minor_version != second->minor_version ||
 765             first->patch_version != second->patch_version ||
 766             first->gvalid_words  != second->gvalid_words  ||
 767             first->ctime         != second->ctime         ||
 768             first->level         != second->level         ||
 769             first->size          != second->size          ||
 770             first->raid_disks    != second->raid_disks    )
 771                 return 3;
 772
 773         return 0;
 774 }
 775
 776
 777 static void free_super0(struct supertype *st);
 778
 779 static int load_super0(struct supertype *st, int fd, char *devname)
 780 {
 781         /* try to read in the superblock
 782          * Return:
 783          *  0 on success
 784          *  1 on cannot get superblock
 785          *  2 on superblock meaningless
 786          */
 787         unsigned long long dsize;
 788         unsigned long long offset;
 789         mdp_super_t *super;
 790         int uuid[4];
 791         struct bitmap_super_s *bsb;
 792
 793         free_super0(st);
 794
 795         if (st->subarray[0])
 796                 return 1;
 797
 798         if (!get_dev_size(fd, devname, &dsize))
 799                 return 1;
 800
 801         if (dsize < MD_RESERVED_SECTORS*512) {
 802                 if (devname)
 803                         fprintf(stderr, Name
 804                             ": %s is too small for md: size is %llu sectors.\n",
 805                                 devname, dsize);
 806                 return 1;
 807         }
 808
 809         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 810
 811         offset *= 512;
 812
 813         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 814
 815         if (lseek64(fd, offset, 0)< 0LL) {
 816                 if (devname)
 817                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 818                                 devname, strerror(errno));
 819                 return 1;
 820         }
 821
 822         if (posix_memalign((void**)&super, 4096,
 823                            MD_SB_BYTES +
 824                            ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
 825                 fprintf(stderr, Name
 826                         ": %s could not allocate superblock\n", __func__);
 827                 return 1;
 828         }
 829
 830         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 831                 if (devname)
 832                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 833                                 devname);
 834                 free(super);
 835                 return 1;
 836         }
 837
 838         if (st->ss && st->minor_version == 9)
 839                 super0_swap_endian(super);
 840
 841         if (super->md_magic != MD_SB_MAGIC) {
 842                 if (devname)
 843                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 844                                 devname, MD_SB_MAGIC, super->md_magic);
 845                 free(super);
 846                 return 2;
 847         }
 848
 849         if (super->major_version != 0) {
 850                 if (devname)
 851                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 852                                 devname, super->major_version);
 853                 free(super);
 854                 return 2;
 855         }
 856         st->sb = super;
 857
 858         if (st->ss == NULL) {
 859                 st->ss = &super0;
 860                 st->minor_version = super->minor_version;
 861                 st->max_devs = MD_SB_DISKS;
 862                 st->info = NULL;
 863         }
 864
 865         /* Now check on the bitmap superblock */
 866         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
 867                 return 0;
 868         /* Read the bitmap superblock and make sure it looks
 869          * valid.  If it doesn't clear the bit.  An --assemble --force
 870          * should get that written out.
 871          */
 872         if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096))
 873             != ROUND_UP(sizeof(struct bitmap_super_s),4096))
 874                 goto no_bitmap;
 875
 876         uuid_from_super0(st, uuid);
 877         bsb = (struct bitmap_super_s *)(super+1);
 878         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
 879             memcmp(bsb->uuid, uuid, 16) != 0)
 880                 goto no_bitmap;
 881         return 0;
 882
 883  no_bitmap:
 884         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
 885
 886         return 0;
 887 }
 888
 889 static struct supertype *match_metadata_desc0(char *arg)
 890 {
 891         struct supertype *st = malloc(sizeof(*st));
 892         if (!st) return st;
 893
 894         memset(st, 0, sizeof(*st));
 895         st->ss = &super0;
 896         st->info = NULL;
 897         st->minor_version = 90;
 898         st->max_devs = MD_SB_DISKS;
 899         st->sb = NULL;
 900         /* we sometimes get 00.90 */
 901         while (arg[0] == '0' && arg[1] == '0')
 902                 arg++;
 903         if (strcmp(arg, "0") == 0 ||
 904             strcmp(arg, "0.90") == 0 ||
 905             strcmp(arg, "default") == 0 ||
 906             strcmp(arg, "") == 0 /* no metadata */
 907                 )
 908                 return st;
 909
 910         st->minor_version = 91; /* reshape in progress */
 911         if (strcmp(arg, "0.91") == 0) /* For dup_super support */
 912                 return st;
 913
 914         st->minor_version = 9; /* flag for 'byte-swapped' */
 915         if (strcmp(arg, "0.swap")==0 ||
 916             strcmp(arg, "0.9") == 0) /* For dup_super support */
 917                 return st;
 918
 919         free(st);
 920         return NULL;
 921 }
 922
 923 static __u64 avail_size0(struct supertype *st, __u64 devsize)
 924 {
 925         if (devsize < MD_RESERVED_SECTORS)
 926                 return 0ULL;
 927         return MD_NEW_SIZE_SECTORS(devsize);
 928 }
 929
 930 static int add_internal_bitmap0(struct supertype *st, int *chunkp,
 931                                 int delay, int write_behind,
 932                                 unsigned long long size, int may_change,
 933                                 int major)
 934 {
 935         /*
 936          * The bitmap comes immediately after the superblock and must be 60K in size
 937          * at most.  The default size is between 30K and 60K
 938          *
 939          * size is in sectors,  chunk is in bytes !!!
 940          */
 941         unsigned long long bits;
 942         unsigned long long max_bits = 60*1024*8;
 943         unsigned long long min_chunk;
 944         int chunk = *chunkp;
 945         mdp_super_t *sb = st->sb;
 946         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
 947
 948
 949         min_chunk = 4096; /* sub-page chunks don't work yet.. */
 950         bits = (size * 512) / min_chunk + 1;
 951         while (bits > max_bits) {
 952                 min_chunk *= 2;
 953                 bits = (bits+1)/2;
 954         }
 955         if (chunk == UnSet)
 956                 chunk = min_chunk;
 957         else if (chunk < min_chunk)
 958                 return 0; /* chunk size too small */
 959
 960         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 961
 962         memset(bms, 0, sizeof(*bms));
 963         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
 964         bms->version = __cpu_to_le32(major);
 965         uuid_from_super0(st, (int*)bms->uuid);
 966         bms->chunksize = __cpu_to_le32(chunk);
 967         bms->daemon_sleep = __cpu_to_le32(delay);
 968         bms->sync_size = __cpu_to_le64(size);
 969         bms->write_behind = __cpu_to_le32(write_behind);
 970         *chunkp = chunk;
 971         return 1;
 972 }
 973
 974
 975 static void locate_bitmap0(struct supertype *st, int fd)
 976 {
 977         unsigned long long dsize;
 978         unsigned long long offset;
 979
 980         if (!get_dev_size(fd, NULL, &dsize))
 981                 return;
 982
 983         if (dsize < MD_RESERVED_SECTORS*512)
 984                 return;
 985
 986         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 987
 988         offset *= 512;
 989
 990         offset += MD_SB_BYTES;
 991
 992         lseek64(fd, offset, 0);
 993 }
 994
 995 static int write_bitmap0(struct supertype *st, int fd)
 996 {
 997         unsigned long long dsize;
 998         unsigned long long offset;
 999         mdp_super_t *sb = st->sb;
1000
1001         int rv = 0;
1002
1003         int towrite, n;
1004         char abuf[4096+4096];
1005         char *buf = (char*)(((long)(abuf+4096))&~4095L);
1006
1007         if (!get_dev_size(fd, NULL, &dsize))
1008                 return 1;
1009
1010
1011         if (dsize < MD_RESERVED_SECTORS*512)
1012                 return -1;
1013
1014         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
1015
1016         offset *= 512;
1017
1018         if (lseek64(fd, offset + 4096, 0)< 0LL)
1019                 return 3;
1020
1021         memset(buf, 0xff, 4096);
1022         memcpy(buf,  ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
1023         towrite = 64*1024;
1024         while (towrite > 0) {
1025                 n = towrite;
1026                 if (n > 4096)
1027                         n = 4096;
1028                 n = write(fd, buf, n);
1029                 if (n > 0)
1030                         towrite -= n;
1031                 else
1032                         break;
1033                 memset(buf, 0xff, 4096);
1034         }
1035         fsync(fd);
1036         if (towrite)
1037                 rv = -2;
1038
1039         return rv;
1040 }
1041
1042 static void free_super0(struct supertype *st)
1043 {
1044         if (st->sb)
1045                 free(st->sb);
1046         st->sb = NULL;
1047 }
1048
1049 #ifndef MDASSEMBLE
1050 static int validate_geometry0(struct supertype *st, int level,
1051                               int layout, int raiddisks,
1052                               int chunk, unsigned long long size,
1053                               char *subdev, unsigned long long *freesize,
1054                               int verbose)
1055 {
1056         unsigned long long ldsize;
1057         int fd;
1058
1059         if (level == LEVEL_CONTAINER)
1060                 return 0;
1061         if (raiddisks > MD_SB_DISKS)
1062                 return 0;
1063         if (size > (0x7fffffffULL<<9))
1064                 return 0;
1065         if (!subdev)
1066                 return 1;
1067
1068         fd = open(subdev, O_RDONLY|O_EXCL, 0);
1069         if (fd < 0) {
1070                 if (verbose)
1071                         fprintf(stderr, Name ": super0.90 cannot open %s: %s\n",
1072                                 subdev, strerror(errno));
1073                 return 0;
1074         }
1075
1076         if (!get_dev_size(fd, subdev, &ldsize)) {
1077                 close(fd);
1078                 return 0;
1079         }
1080         close(fd);
1081
1082         if (ldsize < MD_RESERVED_SECTORS * 512)
1083                 return 0;
1084         if (size > (0x7fffffffULL<<9))
1085                 return 0;
1086         *freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
1087         return 1;
1088 }
1089 #endif /* MDASSEMBLE */
1090
1091 struct superswitch super0 = {
1092 #ifndef MDASSEMBLE
1093         .examine_super = examine_super0,
1094         .brief_examine_super = brief_examine_super0,
1095         .export_examine_super = export_examine_super0,
1096         .detail_super = detail_super0,
1097         .brief_detail_super = brief_detail_super0,
1098         .write_init_super = write_init_super0,
1099         .validate_geometry = validate_geometry0,
1100         .add_to_super = add_to_super0,
1101 #endif
1102         .match_home = match_home0,
1103         .uuid_from_super = uuid_from_super0,
1104         .getinfo_super = getinfo_super0,
1105         .update_super = update_super0,
1106         .init_super = init_super0,
1107         .store_super = store_super0,
1108         .compare_super = compare_super0,
1109         .load_super = load_super0,
1110         .match_metadata_desc = match_metadata_desc0,
1111         .avail_size = avail_size0,
1112         .add_internal_bitmap = add_internal_bitmap0,
1113         .locate_bitmap = locate_bitmap0,
1114         .write_bitmap = write_bitmap0,
1115         .free_super = free_super0,
1116         .name = "0.90",
1117 };