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 static void examine_super0(void *sbv)
  55 {
  56         mdp_super_t *sb = sbv;
  57         time_t atime;
  58         int d;
  59         char *c;
  60
  61         printf("          Magic : %08x\n", sb->md_magic);
  62         printf("        Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
  63                sb->patch_version);
  64         if (sb->minor_version >= 90)
  65                 printf("           UUID : %08x:%08x:%08x:%08x\n", sb->set_uuid0, sb->set_uuid1,
  66                        sb->set_uuid2, sb->set_uuid3);
  67         else
  68                 printf("           UUID : %08x\n", sb->set_uuid0);
  69
  70         atime = sb->ctime;
  71         printf("  Creation Time : %.24s\n", ctime(&atime));
  72         c=map_num(pers, sb->level);
  73         printf("     Raid Level : %s\n", c?c:"-unknown-");
  74         if ((int)sb->level >= 0)
  75                 printf("    Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
  76         printf("   Raid Devices : %d\n", sb->raid_disks);
  77         printf("  Total Devices : %d\n", sb->nr_disks);
  78         printf("Preferred Minor : %d\n", sb->md_minor);
  79         printf("\n");
  80         atime = sb->utime;
  81         printf("    Update Time : %.24s\n", ctime(&atime));
  82         printf("          State : %s\n",
  83                (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
  84         printf(" Active Devices : %d\n", sb->active_disks);
  85         printf("Working Devices : %d\n", sb->working_disks);
  86         printf(" Failed Devices : %d\n", sb->failed_disks);
  87         printf("  Spare Devices : %d\n", sb->spare_disks);
  88         if (calc_sb0_csum(sb) == sb->sb_csum)
  89                 printf("       Checksum : %x - correct\n", sb->sb_csum);
  90         else
  91                 printf("       Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
  92         printf("         Events : %d.%d\n", sb->events_hi, sb->events_lo);
  93         printf("\n");
  94         if (sb->level == 5) {
  95                 c = map_num(r5layout, sb->layout);
  96                 printf("         Layout : %s\n", c?c:"-unknown-");
  97         }
  98         switch(sb->level) {
  99         case 0:
 100         case 4:
 101         case 5:
 102                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 103                 break;
 104         case -1:
 105                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 106                 break;
 107         default: break;
 108         }
 109         printf("\n");
 110         printf("      Number   Major   Minor   RaidDevice State\n");
 111         for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
 112                 mdp_disk_t *dp;
 113                 char *dv;
 114                 char nb[5];
 115                 if (d>=0) dp = &sb->disks[d];
 116                 else dp = &sb->this_disk;
 117                 sprintf(nb, "%4d", d);
 118                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 119                        dp->number, dp->major, dp->minor, dp->raid_disk);
 120                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 121                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 122                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 123                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 124                 if (dp->state == 0) printf(" spare");
 125                 if ((dv=map_dev(dp->major, dp->minor)))
 126                         printf("   %s", dv);
 127                 printf("\n");
 128                 if (d == -1) printf("\n");
 129         }
 130 }
 131
 132 static void brief_examine_super0(void *sbv)
 133 {
 134         mdp_super_t *sb = sbv;
 135         char *c=map_num(pers, sb->level);
 136
 137         printf("ARRAY %s level=%s num-devices=%d UUID=",
 138                get_md_name(sb->md_minor),
 139                c?c:"-unknown-", sb->raid_disks);
 140         if (sb->minor_version >= 90)
 141                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 142                        sb->set_uuid2, sb->set_uuid3);
 143         else
 144                 printf("%08x", sb->set_uuid0);
 145         printf("\n");
 146 }
 147
 148 static void detail_super0(void *sbv)
 149 {
 150         mdp_super_t *sb = sbv;
 151         printf("           UUID : ");
 152         if (sb->minor_version >= 90)
 153                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 154                        sb->set_uuid2, sb->set_uuid3);
 155         else
 156                 printf("%08x", sb->set_uuid0);
 157         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 158 }
 159
 160 static void brief_detail_super0(void *sbv)
 161 {
 162         mdp_super_t *sb = sbv;
 163         printf(" UUID=");
 164         if (sb->minor_version >= 90)
 165                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 166                        sb->set_uuid2, sb->set_uuid3);
 167         else
 168                 printf("%08x", sb->set_uuid0);
 169 }
 170
 171 static void uuid_from_super0(int uuid[4], void * sbv)
 172 {
 173         mdp_super_t *super = sbv;
 174         uuid[0] = super->set_uuid0;
 175         if (super->minor_version >= 90) {
 176                 uuid[1] = super->set_uuid1;
 177                 uuid[2] = super->set_uuid2;
 178                 uuid[3] = super->set_uuid3;
 179         } else {
 180                 uuid[1] = 0;
 181                 uuid[2] = 0;
 182                 uuid[3] = 0;
 183         }
 184 }
 185
 186 static void getinfo_super0(struct mdinfo *info, void *sbv)
 187 {
 188         mdp_super_t *sb = sbv;
 189         int working = 0;
 190         int i;
 191
 192         info->array.major_version = sb->major_version;
 193         info->array.minor_version = sb->minor_version;
 194         info->array.patch_version = sb->patch_version;
 195         info->array.raid_disks = sb->raid_disks;
 196         info->array.level = sb->level;
 197         info->array.md_minor = sb->md_minor;
 198         info->array.ctime = sb->ctime;
 199
 200         info->disk.state = sb->this_disk.state;
 201         info->disk.major = sb->this_disk.major;
 202         info->disk.minor = sb->this_disk.minor;
 203         info->disk.raid_disk = sb->this_disk.raid_disk;
 204
 205         info->events = md_event(sb);
 206
 207         uuid_from_super0(info->uuid, sbv);
 208
 209         /* work_disks is calculated rather than read directly */
 210         for (i=0; i < MD_SB_DISKS; i++)
 211                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 212                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 213                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
 214                         working ++;
 215         info->array.working_disks = working;
 216 }
 217
 218
 219 static int update_super0(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
 220 {
 221         int rv = 0;
 222         mdp_super_t *sb = sbv;
 223         if (strcmp(update, "sparc2.2")==0 ) {
 224                 /* 2.2 sparc put the events in the wrong place
 225                  * So we copy the tail of the superblock
 226                  * up 4 bytes before continuing
 227                  */
 228                 __u32 *sb32 = (__u32*)sb;
 229                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 230                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 231                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 232                 fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 233                          devname);
 234         }
 235         if (strcmp(update, "super-minor") ==0) {
 236                 sb->md_minor = info->array.md_minor;
 237                 if (verbose)
 238                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 239                                 devname, info->array.md_minor);
 240         }
 241         if (strcmp(update, "summaries") == 0) {
 242                 int i;
 243                 /* set nr_disks, active_disks, working_disks,
 244                  * failed_disks, spare_disks based on disks[]
 245                  * array in superblock.
 246                  * Also make sure extra slots aren't 'failed'
 247                  */
 248                 sb->nr_disks = sb->active_disks =
 249                         sb->working_disks = sb->failed_disks =
 250                         sb->spare_disks = 0;
 251                 for (i=0; i < MD_SB_DISKS ; i++)
 252                         if (sb->disks[i].major ||
 253                             sb->disks[i].minor) {
 254                                 int state = sb->disks[i].state;
 255                                 if (state & (1<<MD_DISK_REMOVED))
 256                                         continue;
 257                                 sb->nr_disks++;
 258                                 if (state & (1<<MD_DISK_ACTIVE))
 259                                         sb->active_disks++;
 260                                 if (state & (1<<MD_DISK_FAULTY))
 261                                         sb->failed_disks++;
 262                                 else
 263                                         sb->working_disks++;
 264                                 if (state == 0)
 265                                         sb->spare_disks++;
 266                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 267                                 sb->disks[i].state = 0;
 268         }
 269         if (strcmp(update, "force")==0) {
 270                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 271                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 272                 if (sb->level == 5 || sb->level == 4 || sb->level == 6)
 273                         /* need to force clean */
 274                         sb->state |= (1 << MD_SB_CLEAN);
 275         }
 276         if (strcmp(update, "assemble")==0) {
 277                 int d = info->disk.number;
 278                 if (sb->disks[d].state != info->disk.state) {
 279                         sb->disks[d].state = info->disk.state;
 280                         rv = 1;
 281                 }
 282         }
 283         if (strcmp(update, "newdev") == 0) {
 284                 int d = info->disk.number;
 285                 memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
 286                 sb->disks[d].number = d;
 287                 sb->disks[d].major = info->disk.major;
 288                 sb->disks[d].minor = info->disk.minor;
 289                 sb->disks[d].raid_disk = info->disk.raid_disk;
 290                 sb->disks[d].state = info->disk.state;
 291                 sb->this_disk = sb->disks[d];
 292         }
 293         if (strcmp(update, "grow") == 0) {
 294                 sb->raid_disks = info->array.raid_disks;
 295                 sb->nr_disks = info->array.nr_disks;
 296                 sb->active_disks = info->array.active_disks;
 297                 sb->working_disks = info->array.working_disks;
 298                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 299                 sb->disks[info->disk.number].number = info->disk.number;
 300                 sb->disks[info->disk.number].major = info->disk.major;
 301                 sb->disks[info->disk.number].minor = info->disk.minor;
 302                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 303                 sb->disks[info->disk.number].state = info->disk.state;
 304                 if (sb->this_disk.number == info->disk.number)
 305                         sb->this_disk = sb->disks[info->disk.number];
 306         }
 307         if (strcmp(update, "resync") == 0) {
 308                 /* make sure resync happens */
 309                 sb->state &= ~(1<<MD_SB_CLEAN);
 310                 sb->recovery_cp = 0;
 311         }
 312
 313         sb->sb_csum = calc_sb0_csum(sb);
 314         return rv;
 315 }
 316
 317 static __u64 event_super0(void *sbv)
 318 {
 319         mdp_super_t *sb = sbv;
 320         return md_event(sb);
 321 }
 322
 323
 324
 325 static void init_super0(void **sbp, mdu_array_info_t *info)
 326 {
 327         mdp_super_t *sb = malloc(MD_SB_BYTES);
 328         memset(sb, 0, MD_SB_BYTES);
 329
 330         if (info->major_version == -1) {
 331                 /* zeroing the superblock */
 332                 return;
 333         }
 334
 335         sb->md_magic = MD_SB_MAGIC;
 336         sb->major_version = 0;
 337         sb->minor_version = 90;
 338         sb->patch_version = 0;
 339         sb->gvalid_words = 0; /* ignored */
 340         sb->set_uuid0 = random();
 341         sb->ctime = time(0);
 342         sb->level = info->level;
 343         sb->size = info->size;
 344         sb->nr_disks = info->nr_disks;
 345         sb->raid_disks = info->raid_disks;
 346         sb->md_minor = info->md_minor;
 347         sb->not_persistent = 0;
 348         sb->set_uuid1 = random();
 349         sb->set_uuid2 = random();
 350         sb->set_uuid3 = random();
 351
 352         sb->utime = sb->ctime;
 353         sb->state = info->state;
 354         sb->active_disks = info->active_disks;
 355         sb->working_disks = info->working_disks;
 356         sb->failed_disks = info->failed_disks;
 357         sb->events_hi = 0;
 358         sb->events_lo = 1;
 359
 360         sb->layout = info->layout;
 361         sb->chunk_size = info->chunk_size;
 362
 363         *sbp = sb;
 364 }
 365
 366 /* Add a device to the superblock being created */
 367 static void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
 368 {
 369         mdp_super_t *sb = sbv;
 370         mdp_disk_t *dk = &sb->disks[dinfo->number];
 371
 372         dk->number = dinfo->number;
 373         dk->major = dinfo->major;
 374         dk->minor = dinfo->minor;
 375         dk->raid_disk = dinfo->raid_disk;
 376         dk->state = dinfo->state;
 377 }
 378
 379 static int store_super0(int fd, void *sbv)
 380 {
 381         unsigned long size;
 382         unsigned long long dsize;
 383         unsigned long long offset;
 384         mdp_super_t *super = sbv;
 385
 386 #ifdef BLKGETSIZE64
 387         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 388 #endif
 389         {
 390                 if (ioctl(fd, BLKGETSIZE, &size))
 391                         return 1;
 392                 else
 393                         dsize = ((unsigned long long)size)<<9;
 394         }
 395
 396         if (dsize < MD_RESERVED_SECTORS*2)
 397                 return 2;
 398
 399         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 400
 401         offset *= 512;
 402
 403         if (lseek64(fd, offset, 0)< 0LL)
 404                 return 3;
 405
 406         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 407                 return 4;
 408
 409         return 0;
 410 }
 411
 412 static int write_init_super0(void *sbv, mdu_disk_info_t *dinfo, char *devname)
 413 {
 414         mdp_super_t *sb = sbv;
 415         int fd = open(devname, O_RDWR, O_EXCL);
 416         int rv;
 417
 418         if (fd < 0) {
 419                 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
 420                 return -1;
 421         }
 422
 423         sb->this_disk = sb->disks[dinfo->number];
 424         sb->sb_csum = calc_sb0_csum(sb);
 425         rv = store_super0(fd, sb);
 426         close(fd);
 427         if (rv)
 428                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
 429         return rv;
 430 }
 431
 432 static int compare_super0(void **firstp, void *secondv)
 433 {
 434         /*
 435          * return:
 436          *  0 same, or first was empty, and second was copied
 437          *  1 second had wrong number
 438          *  2 wrong uuid
 439          *  3 wrong other info
 440          */
 441         mdp_super_t *first = *firstp;
 442         mdp_super_t *second = secondv;
 443
 444         int uuid1[4], uuid2[4];
 445         if (second->md_magic != MD_SB_MAGIC)
 446                 return 1;
 447         if (!first) {
 448                 first = malloc(MD_SB_BYTES);
 449                 memcpy(first, second, MD_SB_BYTES);
 450                 *firstp = first;
 451                 return 0;
 452         }
 453
 454         uuid_from_super0(uuid1, first);
 455         uuid_from_super0(uuid2, second);
 456         if (!same_uuid(uuid1, uuid2))
 457                 return 2;
 458         if (first->major_version != second->major_version ||
 459             first->minor_version != second->minor_version ||
 460             first->patch_version != second->patch_version ||
 461             first->gvalid_words  != second->gvalid_words  ||
 462             first->ctime         != second->ctime         ||
 463             first->level         != second->level         ||
 464             first->size          != second->size          ||
 465             first->raid_disks    != second->raid_disks    )
 466                 return 3;
 467
 468         return 0;
 469 }
 470
 471
 472 static int load_super0(int fd, void **sbp, char *devname)
 473 {
 474         /* try to read in the superblock
 475          * Return:
 476          *  0 on success
 477          *  1 on cannot get superblock
 478          *  2 on superblock meaningless
 479          */
 480         unsigned long size;
 481         unsigned long long dsize;
 482         unsigned long long offset;
 483         mdp_super_t *super;
 484
 485 #ifdef BLKGETSIZE64
 486         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 487 #endif
 488         {
 489                 if (ioctl(fd, BLKGETSIZE, &size)) {
 490                         if (devname)
 491                                 fprintf(stderr, Name ": cannot find device size for %s: %s\n",
 492                                         devname, strerror(errno));
 493                         return 1;
 494                 } else
 495                         dsize = size << 9;
 496         }
 497
 498         if (dsize < MD_RESERVED_SECTORS*2) {
 499                 if (devname)
 500                         fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
 501                                 devname, size);
 502                 return 1;
 503         }
 504
 505         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 506
 507         offset *= 512;
 508
 509         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 510
 511         if (lseek64(fd, offset, 0)< 0LL) {
 512                 if (devname)
 513                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 514                                 devname, strerror(errno));
 515                 return 1;
 516         }
 517
 518         super = malloc(MD_SB_BYTES);
 519
 520         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 521                 if (devname)
 522                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 523                                 devname);
 524                 free(super);
 525                 return 1;
 526         }
 527
 528         if (super->md_magic != MD_SB_MAGIC) {
 529                 if (devname)
 530                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 531                                 devname, MD_SB_MAGIC, super->md_magic);
 532                 free(super);
 533                 return 2;
 534         }
 535
 536         if (super->major_version != 0) {
 537                 if (devname)
 538                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 539                                 devname, super->major_version);
 540                 free(super);
 541                 return 2;
 542         }
 543         *sbp = super;
 544         return 0;
 545 }
 546
 547 static int match_metadata_desc0(char *arg)
 548 {
 549         if (strcmp(arg, "0") == 0 ||
 550             strcmp(arg, "0.90") == 0 ||
 551             strcmp(arg, "default") == 0
 552                 )
 553                 return 1;
 554         return 0;
 555 }
 556
 557 struct superswitch super0 = {
 558         .examine_super = examine_super0,
 559         .brief_examine_super = brief_examine_super0,
 560         .detail_super = detail_super0,
 561         .brief_detail_super = brief_detail_super0,
 562         .uuid_from_super = uuid_from_super0,
 563         .getinfo_super = getinfo_super0,
 564         .update_super = update_super0,
 565         .event_super = event_super0,
 566         .init_super = init_super0,
 567         .add_to_super = add_to_super0,
 568         .store_super = store_super0,
 569         .write_init_super = write_init_super0,
 570         .compare_super = compare_super0,
 571         .load_super = load_super0,
 572         .match_metadata_desc = match_metadata_desc0,
 573 };