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 #include <asm/byteorder.h>
  32
  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 #ifndef MDASSEMBLE
  56 static void examine_super0(void *sbv)
  57 {
  58         mdp_super_t *sb = sbv;
  59         time_t atime;
  60         int d;
  61         char *c;
  62
  63         printf("          Magic : %08x\n", sb->md_magic);
  64         printf("        Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
  65                sb->patch_version);
  66         if (sb->minor_version >= 90)
  67                 printf("           UUID : %08x:%08x:%08x:%08x\n", sb->set_uuid0, sb->set_uuid1,
  68                        sb->set_uuid2, sb->set_uuid3);
  69         else
  70                 printf("           UUID : %08x\n", sb->set_uuid0);
  71
  72         atime = sb->ctime;
  73         printf("  Creation Time : %.24s\n", ctime(&atime));
  74         c=map_num(pers, sb->level);
  75         printf("     Raid Level : %s\n", c?c:"-unknown-");
  76         if ((int)sb->level >= 0)
  77                 printf("    Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
  78         printf("   Raid Devices : %d\n", sb->raid_disks);
  79         printf("  Total Devices : %d\n", sb->nr_disks);
  80         printf("Preferred Minor : %d\n", sb->md_minor);
  81         printf("\n");
  82         atime = sb->utime;
  83         printf("    Update Time : %.24s\n", ctime(&atime));
  84         printf("          State : %s\n",
  85                (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
  86         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
  87                 printf("Internal Bitmap : present\n");
  88         printf(" Active Devices : %d\n", sb->active_disks);
  89         printf("Working Devices : %d\n", sb->working_disks);
  90         printf(" Failed Devices : %d\n", sb->failed_disks);
  91         printf("  Spare Devices : %d\n", sb->spare_disks);
  92         if (calc_sb0_csum(sb) == sb->sb_csum)
  93                 printf("       Checksum : %x - correct\n", sb->sb_csum);
  94         else
  95                 printf("       Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
  96         printf("         Events : %d.%d\n", sb->events_hi, sb->events_lo);
  97         printf("\n");
  98         if (sb->level == 5) {
  99                 c = map_num(r5layout, sb->layout);
 100                 printf("         Layout : %s\n", c?c:"-unknown-");
 101         }
 102         switch(sb->level) {
 103         case 0:
 104         case 4:
 105         case 5:
 106                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 107                 break;
 108         case -1:
 109                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 110                 break;
 111         default: break;
 112         }
 113         printf("\n");
 114         printf("      Number   Major   Minor   RaidDevice State\n");
 115         for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
 116                 mdp_disk_t *dp;
 117                 char *dv;
 118                 char nb[5];
 119                 if (d>=0) dp = &sb->disks[d];
 120                 else dp = &sb->this_disk;
 121                 snprintf(nb, sizeof(nb), "%4d", d);
 122                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 123                        dp->number, dp->major, dp->minor, dp->raid_disk);
 124                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 125                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 126                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 127                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 128                 if (dp->state == 0) printf(" spare");
 129                 if ((dv=map_dev(dp->major, dp->minor)))
 130                         printf("   %s", dv);
 131                 printf("\n");
 132                 if (d == -1) printf("\n");
 133         }
 134 }
 135
 136 static void brief_examine_super0(void *sbv)
 137 {
 138         mdp_super_t *sb = sbv;
 139         char *c=map_num(pers, sb->level);
 140
 141         printf("ARRAY %s level=%s num-devices=%d UUID=",
 142                get_md_name(sb->md_minor),
 143                c?c:"-unknown-", sb->raid_disks);
 144         if (sb->minor_version >= 90)
 145                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 146                        sb->set_uuid2, sb->set_uuid3);
 147         else
 148                 printf("%08x", sb->set_uuid0);
 149         printf("\n");
 150 }
 151
 152 static void detail_super0(void *sbv)
 153 {
 154         mdp_super_t *sb = sbv;
 155         printf("           UUID : ");
 156         if (sb->minor_version >= 90)
 157                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 158                        sb->set_uuid2, sb->set_uuid3);
 159         else
 160                 printf("%08x", sb->set_uuid0);
 161         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 162 }
 163
 164 static void brief_detail_super0(void *sbv)
 165 {
 166         mdp_super_t *sb = sbv;
 167         printf(" UUID=");
 168         if (sb->minor_version >= 90)
 169                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 170                        sb->set_uuid2, sb->set_uuid3);
 171         else
 172                 printf("%08x", sb->set_uuid0);
 173 }
 174 #endif
 175 static void uuid_from_super0(int uuid[4], void * sbv)
 176 {
 177         mdp_super_t *super = sbv;
 178         uuid[0] = super->set_uuid0;
 179         if (super->minor_version >= 90) {
 180                 uuid[1] = super->set_uuid1;
 181                 uuid[2] = super->set_uuid2;
 182                 uuid[3] = super->set_uuid3;
 183         } else {
 184                 uuid[1] = 0;
 185                 uuid[2] = 0;
 186                 uuid[3] = 0;
 187         }
 188 }
 189
 190 static void getinfo_super0(struct mdinfo *info, void *sbv)
 191 {
 192         mdp_super_t *sb = sbv;
 193         int working = 0;
 194         int i;
 195
 196         info->array.major_version = sb->major_version;
 197         info->array.minor_version = sb->minor_version;
 198         info->array.patch_version = sb->patch_version;
 199         info->array.raid_disks = sb->raid_disks;
 200         info->array.level = sb->level;
 201         info->array.md_minor = sb->md_minor;
 202         info->array.ctime = sb->ctime;
 203
 204         info->disk.state = sb->this_disk.state;
 205         info->disk.major = sb->this_disk.major;
 206         info->disk.minor = sb->this_disk.minor;
 207         info->disk.raid_disk = sb->this_disk.raid_disk;
 208
 209         info->events = md_event(sb);
 210
 211         uuid_from_super0(info->uuid, sbv);
 212
 213         /* work_disks is calculated rather than read directly */
 214         for (i=0; i < MD_SB_DISKS; i++)
 215                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 216                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 217                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
 218                         working ++;
 219         info->array.working_disks = working;
 220 }
 221
 222
 223 static int update_super0(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
 224 {
 225         int rv = 0;
 226         mdp_super_t *sb = sbv;
 227         if (strcmp(update, "sparc2.2")==0 ) {
 228                 /* 2.2 sparc put the events in the wrong place
 229                  * So we copy the tail of the superblock
 230                  * up 4 bytes before continuing
 231                  */
 232                 __u32 *sb32 = (__u32*)sb;
 233                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 234                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 235                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 236                 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 237                          devname);
 238         }
 239         if (strcmp(update, "super-minor") ==0) {
 240                 sb->md_minor = info->array.md_minor;
 241                 if (verbose)
 242                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 243                                 devname, info->array.md_minor);
 244         }
 245         if (strcmp(update, "summaries") == 0) {
 246                 int i;
 247                 /* set nr_disks, active_disks, working_disks,
 248                  * failed_disks, spare_disks based on disks[]
 249                  * array in superblock.
 250                  * Also make sure extra slots aren't 'failed'
 251                  */
 252                 sb->nr_disks = sb->active_disks =
 253                         sb->working_disks = sb->failed_disks =
 254                         sb->spare_disks = 0;
 255                 for (i=0; i < MD_SB_DISKS ; i++)
 256                         if (sb->disks[i].major ||
 257                             sb->disks[i].minor) {
 258                                 int state = sb->disks[i].state;
 259                                 if (state & (1<<MD_DISK_REMOVED))
 260                                         continue;
 261                                 sb->nr_disks++;
 262                                 if (state & (1<<MD_DISK_ACTIVE))
 263                                         sb->active_disks++;
 264                                 if (state & (1<<MD_DISK_FAULTY))
 265                                         sb->failed_disks++;
 266                                 else
 267                                         sb->working_disks++;
 268                                 if (state == 0)
 269                                         sb->spare_disks++;
 270                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 271                                 sb->disks[i].state = 0;
 272         }
 273         if (strcmp(update, "force")==0) {
 274                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 275                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 276                 if (sb->level == 5 || sb->level == 4 || sb->level == 6)
 277                         /* need to force clean */
 278                         sb->state |= (1 << MD_SB_CLEAN);
 279         }
 280         if (strcmp(update, "assemble")==0) {
 281                 int d = info->disk.number;
 282                 if (sb->disks[d].state != info->disk.state) {
 283                         sb->disks[d].state = info->disk.state;
 284                         rv = 1;
 285                 }
 286         }
 287         if (strcmp(update, "newdev") == 0) {
 288                 int d = info->disk.number;
 289                 memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
 290                 sb->disks[d].number = d;
 291                 sb->disks[d].major = info->disk.major;
 292                 sb->disks[d].minor = info->disk.minor;
 293                 sb->disks[d].raid_disk = info->disk.raid_disk;
 294                 sb->disks[d].state = info->disk.state;
 295                 sb->this_disk = sb->disks[d];
 296         }
 297         if (strcmp(update, "grow") == 0) {
 298                 sb->raid_disks = info->array.raid_disks;
 299                 sb->nr_disks = info->array.nr_disks;
 300                 sb->active_disks = info->array.active_disks;
 301                 sb->working_disks = info->array.working_disks;
 302                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 303                 sb->disks[info->disk.number].number = info->disk.number;
 304                 sb->disks[info->disk.number].major = info->disk.major;
 305                 sb->disks[info->disk.number].minor = info->disk.minor;
 306                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 307                 sb->disks[info->disk.number].state = info->disk.state;
 308                 if (sb->this_disk.number == info->disk.number)
 309                         sb->this_disk = sb->disks[info->disk.number];
 310         }
 311         if (strcmp(update, "resync") == 0) {
 312                 /* make sure resync happens */
 313                 sb->state &= ~(1<<MD_SB_CLEAN);
 314                 sb->recovery_cp = 0;
 315         }
 316
 317         sb->sb_csum = calc_sb0_csum(sb);
 318         return rv;
 319 }
 320
 321 static __u64 event_super0(void *sbv)
 322 {
 323         mdp_super_t *sb = sbv;
 324         return md_event(sb);
 325 }
 326
 327
 328
 329 static int init_super0(struct supertype *st, void **sbp, mdu_array_info_t *info)
 330 {
 331         mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 332         int spares;
 333         int rfd;
 334         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 335
 336         if (info->major_version == -1) {
 337                 /* zeroing the superblock */
 338                 return 0;
 339         }
 340
 341         spares = info->working_disks - info->active_disks;
 342         if (info->raid_disks + spares  > MD_SB_DISKS) {
 343                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 344                         info->raid_disks , spares, MD_SB_DISKS);
 345                 return 0;
 346         }
 347
 348         rfd = open("/dev/urandom", O_RDONLY);
 349         sb->md_magic = MD_SB_MAGIC;
 350         sb->major_version = 0;
 351         sb->minor_version = 90;
 352         sb->patch_version = 0;
 353         sb->gvalid_words = 0; /* ignored */
 354         if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 355                 sb->set_uuid0 = random();
 356         sb->ctime = time(0);
 357         sb->level = info->level;
 358         sb->size = info->size;
 359         sb->nr_disks = info->nr_disks;
 360         sb->raid_disks = info->raid_disks;
 361         sb->md_minor = info->md_minor;
 362         sb->not_persistent = 0;
 363         if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 364                 sb->set_uuid1 = random();
 365                 sb->set_uuid2 = random();
 366                 sb->set_uuid3 = random();
 367         }
 368         if (rfd >= 0)
 369                 close(rfd);
 370
 371         sb->utime = sb->ctime;
 372         sb->state = info->state;
 373         sb->active_disks = info->active_disks;
 374         sb->working_disks = info->working_disks;
 375         sb->failed_disks = info->failed_disks;
 376         sb->spare_disks = info->spare_disks;
 377         sb->events_hi = 0;
 378         sb->events_lo = 1;
 379
 380         sb->layout = info->layout;
 381         sb->chunk_size = info->chunk_size;
 382
 383         *sbp = sb;
 384         return 1;
 385 }
 386
 387 /* Add a device to the superblock being created */
 388 static void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
 389 {
 390         mdp_super_t *sb = sbv;
 391         mdp_disk_t *dk = &sb->disks[dinfo->number];
 392
 393         dk->number = dinfo->number;
 394         dk->major = dinfo->major;
 395         dk->minor = dinfo->minor;
 396         dk->raid_disk = dinfo->raid_disk;
 397         dk->state = dinfo->state;
 398 }
 399
 400 static int store_super0(struct supertype *st, int fd, void *sbv)
 401 {
 402         unsigned long size;
 403         unsigned long long dsize;
 404         unsigned long long offset;
 405         mdp_super_t *super = sbv;
 406
 407 #ifdef BLKGETSIZE64
 408         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 409 #endif
 410         {
 411                 if (ioctl(fd, BLKGETSIZE, &size))
 412                         return 1;
 413                 else
 414                         dsize = ((unsigned long long)size)<<9;
 415         }
 416
 417         if (dsize < MD_RESERVED_SECTORS*2)
 418                 return 2;
 419
 420         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 421
 422         offset *= 512;
 423
 424         if (lseek64(fd, offset, 0)< 0LL)
 425                 return 3;
 426
 427         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 428                 return 4;
 429
 430         fsync(fd);
 431         return 0;
 432 }
 433
 434 static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
 435 {
 436         mdp_super_t *sb = sbv;
 437         int fd = open(devname, O_RDWR, O_EXCL);
 438         int rv;
 439
 440         if (fd < 0) {
 441                 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
 442                 return -1;
 443         }
 444
 445         sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
 446         sb->disks[dinfo->number].state |= (1<<MD_DISK_SYNC);
 447
 448         sb->this_disk = sb->disks[dinfo->number];
 449         sb->sb_csum = calc_sb0_csum(sb);
 450         rv = store_super0(st, fd, sb);
 451
 452         if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
 453                 int towrite, n;
 454                 char buf[4096];
 455                 write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
 456                 towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
 457                 memset(buf, 0xff, sizeof(buf));
 458                 while (towrite > 0) {
 459                         n = towrite;
 460                         if (n > sizeof(buf))
 461                                 n = sizeof(buf);
 462                         n = write(fd, buf, n);
 463                         if (n > 0)
 464                                 towrite -= n;
 465                         else
 466                                 break;
 467                 }
 468                 if (towrite)
 469                         rv = -2;
 470         }
 471
 472         close(fd);
 473         if (rv)
 474                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
 475         return rv;
 476 }
 477
 478 static int compare_super0(void **firstp, void *secondv)
 479 {
 480         /*
 481          * return:
 482          *  0 same, or first was empty, and second was copied
 483          *  1 second had wrong number
 484          *  2 wrong uuid
 485          *  3 wrong other info
 486          */
 487         mdp_super_t *first = *firstp;
 488         mdp_super_t *second = secondv;
 489
 490         int uuid1[4], uuid2[4];
 491         if (second->md_magic != MD_SB_MAGIC)
 492                 return 1;
 493         if (!first) {
 494                 first = malloc(MD_SB_BYTES);
 495                 memcpy(first, second, MD_SB_BYTES);
 496                 *firstp = first;
 497                 return 0;
 498         }
 499
 500         uuid_from_super0(uuid1, first);
 501         uuid_from_super0(uuid2, second);
 502         if (!same_uuid(uuid1, uuid2))
 503                 return 2;
 504         if (first->major_version != second->major_version ||
 505             first->minor_version != second->minor_version ||
 506             first->patch_version != second->patch_version ||
 507             first->gvalid_words  != second->gvalid_words  ||
 508             first->ctime         != second->ctime         ||
 509             first->level         != second->level         ||
 510             first->size          != second->size          ||
 511             first->raid_disks    != second->raid_disks    )
 512                 return 3;
 513
 514         return 0;
 515 }
 516
 517
 518 static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
 519 {
 520         /* try to read in the superblock
 521          * Return:
 522          *  0 on success
 523          *  1 on cannot get superblock
 524          *  2 on superblock meaningless
 525          */
 526         unsigned long size;
 527         unsigned long long dsize;
 528         unsigned long long offset;
 529         mdp_super_t *super;
 530
 531 #ifdef BLKGETSIZE64
 532         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 533 #endif
 534         {
 535                 if (ioctl(fd, BLKGETSIZE, &size)) {
 536                         if (devname)
 537                                 fprintf(stderr, Name ": cannot find device size for %s: %s\n",
 538                                         devname, strerror(errno));
 539                         return 1;
 540                 } else
 541                         dsize = size << 9;
 542         }
 543
 544         if (dsize < MD_RESERVED_SECTORS*2) {
 545                 if (devname)
 546                         fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
 547                                 devname, size);
 548                 return 1;
 549         }
 550
 551         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 552
 553         offset *= 512;
 554
 555         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 556
 557         if (lseek64(fd, offset, 0)< 0LL) {
 558                 if (devname)
 559                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 560                                 devname, strerror(errno));
 561                 return 1;
 562         }
 563
 564         super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 565
 566         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 567                 if (devname)
 568                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 569                                 devname);
 570                 free(super);
 571                 return 1;
 572         }
 573
 574         if (super->md_magic != MD_SB_MAGIC) {
 575                 if (devname)
 576                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 577                                 devname, MD_SB_MAGIC, super->md_magic);
 578                 free(super);
 579                 return 2;
 580         }
 581
 582         if (super->major_version != 0) {
 583                 if (devname)
 584                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 585                                 devname, super->major_version);
 586                 free(super);
 587                 return 2;
 588         }
 589         *sbp = super;
 590         if (st->ss == NULL) {
 591                 st->ss = &super0;
 592                 st->minor_version = 90;
 593                 st->max_devs = MD_SB_DISKS;
 594         }
 595
 596         return 0;
 597 }
 598
 599 static struct supertype *match_metadata_desc0(char *arg)
 600 {
 601         struct supertype *st = malloc(sizeof(*st));
 602         if (!st) return st;
 603
 604         st->ss = &super0;
 605         st->minor_version = 90;
 606         st->max_devs = MD_SB_DISKS;
 607         if (strcmp(arg, "0") == 0 ||
 608             strcmp(arg, "0.90") == 0 ||
 609             strcmp(arg, "default") == 0
 610                 )
 611                 return st;
 612
 613         free(st);
 614         return NULL;
 615 }
 616
 617 static __u64 avail_size0(__u64 devsize)
 618 {
 619         if (devsize < MD_RESERVED_SECTORS*2)
 620                 return 0ULL;
 621         return MD_NEW_SIZE_SECTORS(devsize);
 622 }
 623
 624 static int add_internal_bitmap0(void *sbv, int chunk, int delay, unsigned long long size)
 625 {
 626         /*
 627          * The bitmap comes immediately after the superblock and must be 60K in size
 628          * at most.  The default size is between 30K and 60K
 629          *
 630          * size is in K,  chunk is in bytes !!!
 631          */
 632
 633         unsigned long long bits = size;
 634         unsigned long long max_bits = 60*1024*8;
 635         unsigned long long min_chunk;
 636         mdp_super_t *sb = sbv;
 637         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
 638
 639
 640         min_chunk = 1024;
 641         while (bits > max_bits) {
 642                 min_chunk *= 2;
 643                 bits = (bits+1)/2;
 644         }
 645         if (chunk == UnSet)
 646                 chunk = min_chunk;
 647         else if (chunk < min_chunk)
 648                 return 0; /* chunk size too small */
 649
 650         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 651
 652         memset(bms, sizeof(*bms), 0);
 653         bms->magic = __le32_to_cpu(BITMAP_MAGIC);
 654         bms->version = __le32_to_cpu(BITMAP_MAJOR);
 655         uuid_from_super0((int*)bms->uuid, sb);
 656         bms->chunksize = __le32_to_cpu(chunk);
 657         bms->daemon_sleep = __le32_to_cpu(delay);
 658         bms->sync_size = __le64_to_cpu(size);
 659
 660
 661
 662         return 1;
 663 }
 664
 665
 666 void locate_bitmap0(struct supertype *st, int fd)
 667 {
 668         unsigned long long dsize;
 669         unsigned long size;
 670         unsigned long long offset;
 671 #ifdef BLKGETSIZE64
 672         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 673 #endif
 674         {
 675                 if (ioctl(fd, BLKGETSIZE, &size))
 676                         return;
 677                 else
 678                         dsize = ((unsigned long long)size)<<9;
 679         }
 680
 681         if (dsize < MD_RESERVED_SECTORS*2)
 682                 return;
 683
 684         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 685
 686         offset *= 512;
 687
 688         offset += MD_SB_BYTES;
 689
 690         lseek64(fd, offset, 0);
 691 }
 692
 693 int write_bitmap0(struct supertype *st, int fd, void *sbv)
 694 {
 695         unsigned long size;
 696         unsigned long long dsize;
 697         unsigned long long offset;
 698         mdp_super_t *sb = sbv;
 699
 700         int rv = 0;
 701
 702         int towrite, n;
 703         char buf[4096];
 704
 705 #ifdef BLKGETSIZE64
 706         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 707 #endif
 708         {
 709                 if (ioctl(fd, BLKGETSIZE, &size))
 710                         return 1;
 711                 else
 712                         dsize = ((unsigned long long)size)<<9;
 713         }
 714
 715         if (dsize < MD_RESERVED_SECTORS*2)
 716                 return -1;
 717
 718         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 719
 720         offset *= 512;
 721
 722         if (lseek64(fd, offset + 4096, 0)< 0LL)
 723                 return 3;
 724
 725
 726         write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
 727         towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
 728         memset(buf, 0xff, sizeof(buf));
 729         while (towrite > 0) {
 730                 n = towrite;
 731                 if (n > sizeof(buf))
 732                         n = sizeof(buf);
 733                 n = write(fd, buf, n);
 734                 if (n > 0)
 735                         towrite -= n;
 736                 else
 737                         break;
 738         }
 739         if (towrite)
 740                 rv = -2;
 741
 742         return rv;
 743 }
 744
 745
 746 struct superswitch super0 = {
 747 #ifndef MDASSEMBLE
 748         .examine_super = examine_super0,
 749         .brief_examine_super = brief_examine_super0,
 750         .detail_super = detail_super0,
 751         .brief_detail_super = brief_detail_super0,
 752 #endif
 753         .uuid_from_super = uuid_from_super0,
 754         .getinfo_super = getinfo_super0,
 755         .update_super = update_super0,
 756         .event_super = event_super0,
 757         .init_super = init_super0,
 758         .add_to_super = add_to_super0,
 759         .store_super = store_super0,
 760         .write_init_super = write_init_super0,
 761         .compare_super = compare_super0,
 762         .load_super = load_super0,
 763         .match_metadata_desc = match_metadata_desc0,
 764         .avail_size = avail_size0,
 765         .add_internal_bitmap = add_internal_bitmap0,
 766         .locate_bitmap = locate_bitmap0,
 767         .write_bitmap = write_bitmap0,
 768         .major = 0,
 769 };