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