super0.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #include "mdadm.h"
  31
  32 /*
  33  * All handling for the 0.90.0 version superblock is in
  34  * this file.
  35  * This includes:
  36  *   - finding, loading, and writing the superblock.
  37  *   - initialising a new superblock
  38  *   - printing the superblock for --examine
  39  *   - printing part of the superblock for --detail
  40  * .. other stuff
  41  */
  42
  43
  44 static unsigned long calc_sb0_csum(mdp_super_t *super)
  45 {
  46         unsigned long csum = super->sb_csum;
  47         unsigned long newcsum;
  48         super->sb_csum= 0 ;
  49         newcsum = calc_csum(super, MD_SB_BYTES);
  50         super->sb_csum = csum;
  51         return newcsum;
  52 }
  53
  54
  55 void super0_swap_endian(struct mdp_superblock_s *sb)
  56 {
  57         /* as super0 superblocks are host-endian, it is sometimes
  58          * useful to be able to swap the endianness
  59          * as (almost) everything is u32's we byte-swap every 4byte
  60          * number.
  61          * We then also have to swap the events_hi and events_lo
  62          */
  63         char *sbc = (char *)sb;
  64         __u32 t32;
  65         int i;
  66
  67         for (i=0; i < MD_SB_BYTES ; i+=4) {
  68                 char t = sbc[i];
  69                 sbc[i] = sbc[i+3];
  70                 sbc[i+3] = t;
  71                 t=sbc[i+1];
  72                 sbc[i+1]=sbc[i+2];
  73                 sbc[i+2]=t;
  74         }
  75         t32 = sb->events_hi;
  76         sb->events_hi = sb->events_lo;
  77         sb->events_lo = t32;
  78
  79         t32 = sb->cp_events_hi;
  80         sb->cp_events_hi = sb->cp_events_lo;
  81         sb->cp_events_lo = t32;
  82
  83 }
  84
  85 #ifndef MDASSEMBLE
  86
  87 static void examine_super0(void *sbv)
  88 {
  89         mdp_super_t *sb = sbv;
  90         time_t atime;
  91         int d;
  92         char *c;
  93
  94         printf("          Magic : %08x\n", sb->md_magic);
  95         printf("        Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
  96                sb->patch_version);
  97         if (sb->minor_version >= 90)
  98                 printf("           UUID : %08x:%08x:%08x:%08x\n", sb->set_uuid0, sb->set_uuid1,
  99                        sb->set_uuid2, sb->set_uuid3);
 100         else
 101                 printf("           UUID : %08x\n", sb->set_uuid0);
 102
 103         atime = sb->ctime;
 104         printf("  Creation Time : %.24s\n", ctime(&atime));
 105         c=map_num(pers, sb->level);
 106         printf("     Raid Level : %s\n", c?c:"-unknown-");
 107         if ((int)sb->level >= 0) {
 108                 int ddsks=0;
 109                 printf("    Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
 110                 switch(sb->level) {
 111                 case 1: ddsks=1;break;
 112                 case 4:
 113                 case 5: ddsks = sb->raid_disks-1; break;
 114                 case 6: ddsks = sb->raid_disks-2; break;
 115                 case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
 116                 }
 117                 if (ddsks)
 118                         printf("     Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
 119                                human_size(ddsks*(long long)sb->size<<10));
 120         }
 121         printf("   Raid Devices : %d\n", sb->raid_disks);
 122         printf("  Total Devices : %d\n", sb->nr_disks);
 123         printf("Preferred Minor : %d\n", sb->md_minor);
 124         printf("\n");
 125         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 126                 printf("  Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
 127                 if (sb->delta_disks) {
 128                         printf("  Delta Devices : %d", sb->delta_disks);
 129                         if (sb->delta_disks)
 130                                 printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
 131                         else
 132                                 printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
 133                 }
 134                 if (sb->new_level != sb->level) {
 135                         c = map_num(pers, sb->new_level);
 136                         printf("      New Level : %s\n", c?c:"-unknown-");
 137                 }
 138                 if (sb->new_layout != sb->layout) {
 139                         if (sb->level == 5) {
 140                                 c = map_num(r5layout, sb->new_layout);
 141                                 printf("     New Layout : %s\n", c?c:"-unknown-");
 142                         }
 143                         if (sb->level == 10) {
 144                                 printf("     New Layout : near=%d, far=%d\n",
 145                                        sb->new_layout&255, (sb->new_layout>>8)&255);
 146                         }
 147                 }
 148                 if (sb->new_chunk != sb->chunk_size)
 149                         printf("  New Chunksize : %d\n", sb->new_chunk);
 150                 printf("\n");
 151         }
 152         atime = sb->utime;
 153         printf("    Update Time : %.24s\n", ctime(&atime));
 154         printf("          State : %s\n",
 155                (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
 156         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
 157                 printf("Internal Bitmap : present\n");
 158         printf(" Active Devices : %d\n", sb->active_disks);
 159         printf("Working Devices : %d\n", sb->working_disks);
 160         printf(" Failed Devices : %d\n", sb->failed_disks);
 161         printf("  Spare Devices : %d\n", sb->spare_disks);
 162         if (calc_sb0_csum(sb) == sb->sb_csum)
 163                 printf("       Checksum : %x - correct\n", sb->sb_csum);
 164         else
 165                 printf("       Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
 166         printf("         Events : %d.%d\n", sb->events_hi, sb->events_lo);
 167         printf("\n");
 168         if (sb->level == 5) {
 169                 c = map_num(r5layout, sb->layout);
 170                 printf("         Layout : %s\n", c?c:"-unknown-");
 171         }
 172         if (sb->level == 10) {
 173                 printf("         Layout : near=%d, far=%d\n",
 174                        sb->layout&255, (sb->layout>>8)&255);
 175         }
 176         switch(sb->level) {
 177         case 0:
 178         case 4:
 179         case 5:
 180                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 181                 break;
 182         case -1:
 183                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 184                 break;
 185         default: break;
 186         }
 187         printf("\n");
 188         printf("      Number   Major   Minor   RaidDevice State\n");
 189         for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
 190                 mdp_disk_t *dp;
 191                 char *dv;
 192                 char nb[5];
 193                 int wonly;
 194                 if (d>=0) dp = &sb->disks[d];
 195                 else dp = &sb->this_disk;
 196                 snprintf(nb, sizeof(nb), "%4d", d);
 197                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 198                        dp->number, dp->major, dp->minor, dp->raid_disk);
 199                 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
 200                 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 201                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 202                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 203                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 204                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 205                 if (wonly) printf(" write-mostly");
 206                 if (dp->state == 0) printf(" spare");
 207                 if ((dv=map_dev(dp->major, dp->minor)))
 208                         printf("   %s", dv);
 209                 printf("\n");
 210                 if (d == -1) printf("\n");
 211         }
 212 }
 213
 214 static void brief_examine_super0(void *sbv)
 215 {
 216         mdp_super_t *sb = sbv;
 217         char *c=map_num(pers, sb->level);
 218
 219         printf("ARRAY %s level=%s num-devices=%d UUID=",
 220                get_md_name(sb->md_minor),
 221                c?c:"-unknown-", sb->raid_disks);
 222         if (sb->minor_version >= 90)
 223                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 224                        sb->set_uuid2, sb->set_uuid3);
 225         else
 226                 printf("%08x", sb->set_uuid0);
 227         printf("\n");
 228 }
 229
 230 static void detail_super0(void *sbv)
 231 {
 232         mdp_super_t *sb = sbv;
 233         printf("           UUID : ");
 234         if (sb->minor_version >= 90)
 235                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 236                        sb->set_uuid2, sb->set_uuid3);
 237         else
 238                 printf("%08x", sb->set_uuid0);
 239         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 240 }
 241
 242 static void brief_detail_super0(void *sbv)
 243 {
 244         mdp_super_t *sb = sbv;
 245         printf(" UUID=");
 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 }
 252 #endif
 253 static void uuid_from_super0(int uuid[4], void * sbv)
 254 {
 255         mdp_super_t *super = sbv;
 256         uuid[0] = super->set_uuid0;
 257         if (super->minor_version >= 90) {
 258                 uuid[1] = super->set_uuid1;
 259                 uuid[2] = super->set_uuid2;
 260                 uuid[3] = super->set_uuid3;
 261         } else {
 262                 uuid[1] = 0;
 263                 uuid[2] = 0;
 264                 uuid[3] = 0;
 265         }
 266 }
 267
 268 static void getinfo_super0(struct mdinfo *info, mddev_ident_t ident, void *sbv)
 269 {
 270         mdp_super_t *sb = sbv;
 271         int working = 0;
 272         int i;
 273
 274         info->array.major_version = sb->major_version;
 275         info->array.minor_version = sb->minor_version;
 276         info->array.patch_version = sb->patch_version;
 277         info->array.raid_disks = sb->raid_disks;
 278         info->array.level = sb->level;
 279         info->array.layout = sb->layout;
 280         info->array.md_minor = sb->md_minor;
 281         info->array.ctime = sb->ctime;
 282         info->array.utime = sb->utime;
 283         info->array.chunk_size = sb->chunk_size;
 284         info->component_size = sb->size*2;
 285
 286         info->disk.state = sb->this_disk.state;
 287         info->disk.major = sb->this_disk.major;
 288         info->disk.minor = sb->this_disk.minor;
 289         info->disk.raid_disk = sb->this_disk.raid_disk;
 290         info->disk.number = sb->this_disk.number;
 291
 292         info->events = md_event(sb);
 293         info->data_offset = 0;
 294
 295         uuid_from_super0(info->uuid, sbv);
 296
 297         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 298                 info->reshape_active = 1;
 299                 info->reshape_progress = sb->reshape_position;
 300                 info->new_level = sb->new_level;
 301                 info->delta_disks = sb->delta_disks;
 302                 info->new_layout = sb->new_layout;
 303                 info->new_chunk = sb->new_chunk;
 304         } else
 305                 info->reshape_active = 0;
 306
 307         ident->name[0] = 0;
 308         /* work_disks is calculated rather than read directly */
 309         for (i=0; i < MD_SB_DISKS; i++)
 310                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 311                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 312                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
 313                         working ++;
 314         info->array.working_disks = working;
 315 }
 316
 317
 318 static int update_super0(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
 319 {
 320         int rv = 0;
 321         mdp_super_t *sb = sbv;
 322         if (strcmp(update, "sparc2.2")==0 ) {
 323                 /* 2.2 sparc put the events in the wrong place
 324                  * So we copy the tail of the superblock
 325                  * up 4 bytes before continuing
 326                  */
 327                 __u32 *sb32 = (__u32*)sb;
 328                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 329                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 330                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 331                 if (verbose >= 0)
 332                         fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 333                                  devname);
 334         }
 335         if (strcmp(update, "super-minor") ==0) {
 336                 sb->md_minor = info->array.md_minor;
 337                 if (verbose > 0)
 338                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 339                                 devname, info->array.md_minor);
 340         }
 341         if (strcmp(update, "summaries") == 0) {
 342                 int i;
 343                 /* set nr_disks, active_disks, working_disks,
 344                  * failed_disks, spare_disks based on disks[]
 345                  * array in superblock.
 346                  * Also make sure extra slots aren't 'failed'
 347                  */
 348                 sb->nr_disks = sb->active_disks =
 349                         sb->working_disks = sb->failed_disks =
 350                         sb->spare_disks = 0;
 351                 for (i=0; i < MD_SB_DISKS ; i++)
 352                         if (sb->disks[i].major ||
 353                             sb->disks[i].minor) {
 354                                 int state = sb->disks[i].state;
 355                                 if (state & (1<<MD_DISK_REMOVED))
 356                                         continue;
 357                                 sb->nr_disks++;
 358                                 if (state & (1<<MD_DISK_ACTIVE))
 359                                         sb->active_disks++;
 360                                 if (state & (1<<MD_DISK_FAULTY))
 361                                         sb->failed_disks++;
 362                                 else
 363                                         sb->working_disks++;
 364                                 if (state == 0)
 365                                         sb->spare_disks++;
 366                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 367                                 sb->disks[i].state = 0;
 368         }
 369         if (strcmp(update, "force")==0) {
 370                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 371                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 372                 if (sb->level == 5 || sb->level == 4 || sb->level == 6)
 373                         /* need to force clean */
 374                         sb->state |= (1 << MD_SB_CLEAN);
 375         }
 376         if (strcmp(update, "assemble")==0) {
 377                 int d = info->disk.number;
 378                 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
 379                 sb->disks[d].state &= ~(1<<MD_DISK_WRITEMOSTLY);
 380                 if (sb->disks[d].state != info->disk.state) {
 381                         sb->disks[d].state = info->disk.state & wonly;
 382                         rv = 1;
 383                 }
 384         }
 385         if (strcmp(update, "newdev") == 0) {
 386                 int d = info->disk.number;
 387                 memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
 388                 sb->disks[d].number = d;
 389                 sb->disks[d].major = info->disk.major;
 390                 sb->disks[d].minor = info->disk.minor;
 391                 sb->disks[d].raid_disk = info->disk.raid_disk;
 392                 sb->disks[d].state = info->disk.state;
 393                 sb->this_disk = sb->disks[d];
 394         }
 395         if (strcmp(update, "grow") == 0) {
 396                 sb->raid_disks = info->array.raid_disks;
 397                 sb->nr_disks = info->array.nr_disks;
 398                 sb->active_disks = info->array.active_disks;
 399                 sb->working_disks = info->array.working_disks;
 400                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 401                 sb->disks[info->disk.number].number = info->disk.number;
 402                 sb->disks[info->disk.number].major = info->disk.major;
 403                 sb->disks[info->disk.number].minor = info->disk.minor;
 404                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 405                 sb->disks[info->disk.number].state = info->disk.state;
 406                 if (sb->this_disk.number == info->disk.number)
 407                         sb->this_disk = sb->disks[info->disk.number];
 408         }
 409         if (strcmp(update, "resync") == 0) {
 410                 /* make sure resync happens */
 411                 sb->state &= ~(1<<MD_SB_CLEAN);
 412                 sb->recovery_cp = 0;
 413         }
 414         if (strcmp(update, "uuid") == 0) {
 415                 sb->set_uuid0 = info->uuid[0];
 416                 sb->set_uuid1 = info->uuid[1];
 417                 sb->set_uuid2 = info->uuid[2];
 418                 sb->set_uuid3 = info->uuid[3];
 419         }
 420         if (strcmp(update, "_reshape_progress")==0)
 421                 sb->reshape_position = info->reshape_progress;
 422
 423         sb->sb_csum = calc_sb0_csum(sb);
 424         return rv;
 425 }
 426
 427 static __u64 event_super0(void *sbv)
 428 {
 429         mdp_super_t *sb = sbv;
 430         return md_event(sb);
 431 }
 432
 433
 434
 435 static int init_super0(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *ignored_name)
 436 {
 437         mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 438         int spares;
 439         int rfd;
 440         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 441
 442         if (info->major_version == -1) {
 443                 /* zeroing the superblock */
 444                 return 0;
 445         }
 446
 447         spares = info->working_disks - info->active_disks;
 448         if (info->raid_disks + spares  > MD_SB_DISKS) {
 449                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 450                         info->raid_disks , spares, MD_SB_DISKS);
 451                 return 0;
 452         }
 453
 454         rfd = open("/dev/urandom", O_RDONLY);
 455         sb->md_magic = MD_SB_MAGIC;
 456         sb->major_version = 0;
 457         sb->minor_version = 90;
 458         sb->patch_version = 0;
 459         sb->gvalid_words = 0; /* ignored */
 460         if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 461                 sb->set_uuid0 = random();
 462         sb->ctime = time(0);
 463         sb->level = info->level;
 464         if (size != info->size)
 465                 return 0;
 466         sb->size = info->size;
 467         sb->nr_disks = info->nr_disks;
 468         sb->raid_disks = info->raid_disks;
 469         sb->md_minor = info->md_minor;
 470         sb->not_persistent = 0;
 471         if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 472                 sb->set_uuid1 = random();
 473                 sb->set_uuid2 = random();
 474                 sb->set_uuid3 = random();
 475         }
 476         if (rfd >= 0)
 477                 close(rfd);
 478
 479         sb->utime = sb->ctime;
 480         sb->state = info->state;
 481         sb->active_disks = info->active_disks;
 482         sb->working_disks = info->working_disks;
 483         sb->failed_disks = info->failed_disks;
 484         sb->spare_disks = info->spare_disks;
 485         sb->events_hi = 0;
 486         sb->events_lo = 1;
 487
 488         sb->layout = info->layout;
 489         sb->chunk_size = info->chunk_size;
 490
 491         *sbp = sb;
 492         return 1;
 493 }
 494
 495 /* Add a device to the superblock being created */
 496 static void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
 497 {
 498         mdp_super_t *sb = sbv;
 499         mdp_disk_t *dk = &sb->disks[dinfo->number];
 500
 501         dk->number = dinfo->number;
 502         dk->major = dinfo->major;
 503         dk->minor = dinfo->minor;
 504         dk->raid_disk = dinfo->raid_disk;
 505         dk->state = dinfo->state;
 506 }
 507
 508 static int store_super0(struct supertype *st, int fd, void *sbv)
 509 {
 510         unsigned long size;
 511         unsigned long long dsize;
 512         unsigned long long offset;
 513         mdp_super_t *super = sbv;
 514
 515 #ifdef BLKGETSIZE64
 516         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 517 #endif
 518         {
 519                 if (ioctl(fd, BLKGETSIZE, &size))
 520                         return 1;
 521                 else
 522                         dsize = ((unsigned long long)size)<<9;
 523         }
 524
 525         if (dsize < MD_RESERVED_SECTORS*2*512)
 526                 return 2;
 527
 528         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 529
 530         offset *= 512;
 531
 532         if (lseek64(fd, offset, 0)< 0LL)
 533                 return 3;
 534
 535         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 536                 return 4;
 537
 538         fsync(fd);
 539         return 0;
 540 }
 541
 542 static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
 543 {
 544         mdp_super_t *sb = sbv;
 545         int fd = open(devname, O_RDWR|O_EXCL);
 546         int rv;
 547
 548         if (fd < 0) {
 549                 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
 550                 return -1;
 551         }
 552
 553         sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
 554         sb->disks[dinfo->number].state |= (1<<MD_DISK_SYNC);
 555
 556         sb->this_disk = sb->disks[dinfo->number];
 557         sb->sb_csum = calc_sb0_csum(sb);
 558         rv = store_super0(st, fd, sb);
 559
 560         if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 561                 rv = st->ss->write_bitmap(st, fd, sbv);
 562
 563         close(fd);
 564         if (rv)
 565                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
 566         return rv;
 567 }
 568
 569 static int compare_super0(void **firstp, void *secondv)
 570 {
 571         /*
 572          * return:
 573          *  0 same, or first was empty, and second was copied
 574          *  1 second had wrong number
 575          *  2 wrong uuid
 576          *  3 wrong other info
 577          */
 578         mdp_super_t *first = *firstp;
 579         mdp_super_t *second = secondv;
 580
 581         int uuid1[4], uuid2[4];
 582         if (second->md_magic != MD_SB_MAGIC)
 583                 return 1;
 584         if (!first) {
 585                 first = malloc(MD_SB_BYTES);
 586                 memcpy(first, second, MD_SB_BYTES);
 587                 *firstp = first;
 588                 return 0;
 589         }
 590
 591         uuid_from_super0(uuid1, first);
 592         uuid_from_super0(uuid2, second);
 593         if (!same_uuid(uuid1, uuid2, 0))
 594                 return 2;
 595         if (first->major_version != second->major_version ||
 596             first->minor_version != second->minor_version ||
 597             first->patch_version != second->patch_version ||
 598             first->gvalid_words  != second->gvalid_words  ||
 599             first->ctime         != second->ctime         ||
 600             first->level         != second->level         ||
 601             first->size          != second->size          ||
 602             first->raid_disks    != second->raid_disks    )
 603                 return 3;
 604
 605         return 0;
 606 }
 607
 608
 609 static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
 610 {
 611         /* try to read in the superblock
 612          * Return:
 613          *  0 on success
 614          *  1 on cannot get superblock
 615          *  2 on superblock meaningless
 616          */
 617         unsigned long size;
 618         unsigned long long dsize;
 619         unsigned long long offset;
 620         mdp_super_t *super;
 621
 622 #ifdef BLKGETSIZE64
 623         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 624 #endif
 625         {
 626                 if (ioctl(fd, BLKGETSIZE, &size)) {
 627                         if (devname)
 628                                 fprintf(stderr, Name ": cannot find device size for %s: %s\n",
 629                                         devname, strerror(errno));
 630                         return 1;
 631                 } else
 632                         dsize = size << 9;
 633         }
 634
 635         if (dsize < MD_RESERVED_SECTORS*2) {
 636                 if (devname)
 637                         fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
 638                                 devname, size);
 639                 return 1;
 640         }
 641
 642         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 643
 644         offset *= 512;
 645
 646         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 647
 648         if (lseek64(fd, offset, 0)< 0LL) {
 649                 if (devname)
 650                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 651                                 devname, strerror(errno));
 652                 return 1;
 653         }
 654
 655         super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 656
 657         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 658                 if (devname)
 659                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 660                                 devname);
 661                 free(super);
 662                 return 1;
 663         }
 664
 665         if (st->ss && st->minor_version == 9)
 666                 super0_swap_endian(super);
 667
 668         if (super->md_magic != MD_SB_MAGIC) {
 669                 if (devname)
 670                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 671                                 devname, MD_SB_MAGIC, super->md_magic);
 672                 free(super);
 673                 return 2;
 674         }
 675
 676         if (super->major_version != 0) {
 677                 if (devname)
 678                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 679                                 devname, super->major_version);
 680                 free(super);
 681                 return 2;
 682         }
 683         *sbp = super;
 684         if (st->ss == NULL) {
 685                 st->ss = &super0;
 686                 st->minor_version = 90;
 687                 st->max_devs = MD_SB_DISKS;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static struct supertype *match_metadata_desc0(char *arg)
 694 {
 695         struct supertype *st = malloc(sizeof(*st));
 696         if (!st) return st;
 697
 698         st->ss = &super0;
 699         st->minor_version = 90;
 700         st->max_devs = MD_SB_DISKS;
 701         if (strcmp(arg, "0") == 0 ||
 702             strcmp(arg, "0.90") == 0 ||
 703             strcmp(arg, "default") == 0
 704                 )
 705                 return st;
 706
 707         st->minor_version = 9; /* flag for 'byte-swapped' */
 708         if (strcmp(arg, "0.swap")==0)
 709                 return st;
 710
 711         free(st);
 712         return NULL;
 713 }
 714
 715 static __u64 avail_size0(struct supertype *st, __u64 devsize)
 716 {
 717         if (devsize < MD_RESERVED_SECTORS*2)
 718                 return 0ULL;
 719         return MD_NEW_SIZE_SECTORS(devsize);
 720 }
 721
 722 static int add_internal_bitmap0(struct supertype *st, void *sbv, int chunk, int delay, int write_behind, unsigned long long size, int may_change, int major)
 723 {
 724         /*
 725          * The bitmap comes immediately after the superblock and must be 60K in size
 726          * at most.  The default size is between 30K and 60K
 727          *
 728          * size is in K,  chunk is in bytes !!!
 729          */
 730         unsigned long long bits;
 731         unsigned long long max_bits = 60*1024*8;
 732         unsigned long long min_chunk;
 733         mdp_super_t *sb = sbv;
 734         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
 735
 736
 737         min_chunk = 4096; /* sub-page chunks don't work yet.. */
 738         bits = (size * 512)/ min_chunk +1;
 739         while (bits > max_bits) {
 740                 min_chunk *= 2;
 741                 bits = (bits+1)/2;
 742         }
 743         if (chunk == UnSet)
 744                 chunk = min_chunk;
 745         else if (chunk < min_chunk)
 746                 return 0; /* chunk size too small */
 747
 748         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 749
 750         memset(bms, 0, sizeof(*bms));
 751         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
 752         bms->version = __cpu_to_le32(major);
 753         uuid_from_super0((int*)bms->uuid, sb);
 754         bms->chunksize = __cpu_to_le32(chunk);
 755         bms->daemon_sleep = __cpu_to_le32(delay);
 756         bms->sync_size = __cpu_to_le64(size);
 757         bms->write_behind = __cpu_to_le32(write_behind);
 758
 759
 760
 761         return 1;
 762 }
 763
 764
 765 void locate_bitmap0(struct supertype *st, int fd, void *sbv)
 766 {
 767         unsigned long long dsize;
 768         unsigned long size;
 769         unsigned long long offset;
 770 #ifdef BLKGETSIZE64
 771         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 772 #endif
 773         {
 774                 if (ioctl(fd, BLKGETSIZE, &size))
 775                         return;
 776                 else
 777                         dsize = ((unsigned long long)size)<<9;
 778         }
 779
 780         if (dsize < MD_RESERVED_SECTORS*2)
 781                 return;
 782
 783         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 784
 785         offset *= 512;
 786
 787         offset += MD_SB_BYTES;
 788
 789         lseek64(fd, offset, 0);
 790 }
 791
 792 int write_bitmap0(struct supertype *st, int fd, void *sbv)
 793 {
 794         unsigned long size;
 795         unsigned long long dsize;
 796         unsigned long long offset;
 797         mdp_super_t *sb = sbv;
 798
 799         int rv = 0;
 800
 801         int towrite, n;
 802         char buf[4096];
 803
 804 #ifdef BLKGETSIZE64
 805         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 806 #endif
 807         {
 808                 if (ioctl(fd, BLKGETSIZE, &size))
 809                         return 1;
 810                 else
 811                         dsize = ((unsigned long long)size)<<9;
 812         }
 813
 814         if (dsize < MD_RESERVED_SECTORS*2)
 815         return -1;
 816
 817         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 818
 819         offset *= 512;
 820
 821         if (lseek64(fd, offset + 4096, 0)< 0LL)
 822                 return 3;
 823
 824
 825         if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
 826             sizeof(bitmap_super_t))
 827                 return -2;
 828         towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
 829         memset(buf, 0xff, sizeof(buf));
 830         while (towrite > 0) {
 831                 n = towrite;
 832                 if (n > sizeof(buf))
 833                         n = sizeof(buf);
 834                 n = write(fd, buf, n);
 835                 if (n > 0)
 836                         towrite -= n;
 837                 else
 838                         break;
 839         }
 840         fsync(fd);
 841         if (towrite)
 842                 rv = -2;
 843
 844         return rv;
 845 }
 846
 847 struct superswitch super0 = {
 848 #ifndef MDASSEMBLE
 849         .examine_super = examine_super0,
 850         .brief_examine_super = brief_examine_super0,
 851         .detail_super = detail_super0,
 852         .brief_detail_super = brief_detail_super0,
 853 #endif
 854         .uuid_from_super = uuid_from_super0,
 855         .getinfo_super = getinfo_super0,
 856         .update_super = update_super0,
 857         .event_super = event_super0,
 858         .init_super = init_super0,
 859         .add_to_super = add_to_super0,
 860         .store_super = store_super0,
 861         .write_init_super = write_init_super0,
 862         .compare_super = compare_super0,
 863         .load_super = load_super0,
 864         .match_metadata_desc = match_metadata_desc0,
 865         .avail_size = avail_size0,
 866         .add_internal_bitmap = add_internal_bitmap0,
 867         .locate_bitmap = locate_bitmap0,
 868         .write_bitmap = write_bitmap0,
 869         .major = 0,
 870         .swapuuid = 0,
 871 };