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 #include "mdadm.h"
  31 #include <openssl/sha.h> /* for SHA1 */
  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, char *homehost)
  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", sb->set_uuid0, sb->set_uuid1,
  99                        sb->set_uuid2, sb->set_uuid3);
 100                 if (homehost) {
 101                         unsigned char *hash = SHA1((unsigned char *)homehost,
 102                                                    strlen(homehost),
 103                                                    NULL);
 104                         if (memcmp(&sb->set_uuid2, hash, 8)==0)
 105                                 printf(" (local to host %s)", homehost);
 106                 }
 107                 printf("\n");
 108         } else
 109                 printf("           UUID : %08x\n", sb->set_uuid0);
 110
 111         atime = sb->ctime;
 112         printf("  Creation Time : %.24s\n", ctime(&atime));
 113         c=map_num(pers, sb->level);
 114         printf("     Raid Level : %s\n", c?c:"-unknown-");
 115         if ((int)sb->level >= 0) {
 116                 int ddsks=0;
 117                 printf("    Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
 118                 switch(sb->level) {
 119                 case 1: ddsks=1;break;
 120                 case 4:
 121                 case 5: ddsks = sb->raid_disks-1; break;
 122                 case 6: ddsks = sb->raid_disks-2; break;
 123                 case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
 124                 }
 125                 if (ddsks)
 126                         printf("     Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
 127                                human_size(ddsks*(long long)sb->size<<10));
 128         }
 129         printf("   Raid Devices : %d\n", sb->raid_disks);
 130         printf("  Total Devices : %d\n", sb->nr_disks);
 131         printf("Preferred Minor : %d\n", sb->md_minor);
 132         printf("\n");
 133         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 134                 printf("  Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
 135                 if (sb->delta_disks) {
 136                         printf("  Delta Devices : %d", sb->delta_disks);
 137                         if (sb->delta_disks)
 138                                 printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
 139                         else
 140                                 printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
 141                 }
 142                 if (sb->new_level != sb->level) {
 143                         c = map_num(pers, sb->new_level);
 144                         printf("      New Level : %s\n", c?c:"-unknown-");
 145                 }
 146                 if (sb->new_layout != sb->layout) {
 147                         if (sb->level == 5) {
 148                                 c = map_num(r5layout, sb->new_layout);
 149                                 printf("     New Layout : %s\n", c?c:"-unknown-");
 150                         }
 151                         if (sb->level == 10) {
 152                                 printf("     New Layout : near=%d, %s=%d\n",
 153                                        sb->new_layout&255,
 154                                        (sb->new_layout&0x10000)?"offset":"far",
 155                                        (sb->new_layout>>8)&255);
 156                         }
 157                 }
 158                 if (sb->new_chunk != sb->chunk_size)
 159                         printf("  New Chunksize : %d\n", sb->new_chunk);
 160                 printf("\n");
 161         }
 162         atime = sb->utime;
 163         printf("    Update Time : %.24s\n", ctime(&atime));
 164         printf("          State : %s\n",
 165                (sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
 166         if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
 167                 printf("Internal Bitmap : present\n");
 168         printf(" Active Devices : %d\n", sb->active_disks);
 169         printf("Working Devices : %d\n", sb->working_disks);
 170         printf(" Failed Devices : %d\n", sb->failed_disks);
 171         printf("  Spare Devices : %d\n", sb->spare_disks);
 172         if (calc_sb0_csum(sb) == sb->sb_csum)
 173                 printf("       Checksum : %x - correct\n", sb->sb_csum);
 174         else
 175                 printf("       Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
 176         printf("         Events : %d.%d\n", sb->events_hi, sb->events_lo);
 177         printf("\n");
 178         if (sb->level == 5) {
 179                 c = map_num(r5layout, sb->layout);
 180                 printf("         Layout : %s\n", c?c:"-unknown-");
 181         }
 182         if (sb->level == 10) {
 183                 printf("         Layout : near=%d, %s=%d\n",
 184                        sb->layout&255,
 185                        (sb->layout&0x10000)?"offset":"far",
 186                        (sb->layout>>8)&255);
 187         }
 188         switch(sb->level) {
 189         case 0:
 190         case 4:
 191         case 5:
 192                 printf("     Chunk Size : %dK\n", sb->chunk_size/1024);
 193                 break;
 194         case -1:
 195                 printf("       Rounding : %dK\n", sb->chunk_size/1024);
 196                 break;
 197         default: break;
 198         }
 199         printf("\n");
 200         printf("      Number   Major   Minor   RaidDevice State\n");
 201         for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
 202                 mdp_disk_t *dp;
 203                 char *dv;
 204                 char nb[5];
 205                 int wonly;
 206                 if (d>=0) dp = &sb->disks[d];
 207                 else dp = &sb->this_disk;
 208                 snprintf(nb, sizeof(nb), "%4d", d);
 209                 printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" :  nb,
 210                        dp->number, dp->major, dp->minor, dp->raid_disk);
 211                 wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
 212                 dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
 213                 if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
 214                 if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
 215                 if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
 216                 if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
 217                 if (wonly) printf(" write-mostly");
 218                 if (dp->state == 0) printf(" spare");
 219                 if ((dv=map_dev(dp->major, dp->minor, 0)))
 220                         printf("   %s", dv);
 221                 printf("\n");
 222                 if (d == -1) printf("\n");
 223         }
 224 }
 225
 226 static void brief_examine_super0(void *sbv)
 227 {
 228         mdp_super_t *sb = sbv;
 229         char *c=map_num(pers, sb->level);
 230
 231         printf("ARRAY %s level=%s num-devices=%d UUID=",
 232                get_md_name(sb->md_minor),
 233                c?c:"-unknown-", sb->raid_disks);
 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");
 240 }
 241
 242 static void detail_super0(void *sbv, char *homehost)
 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         if (homehost) {
 252                 unsigned char *hash = SHA1((unsigned char *)homehost,
 253                                            strlen(homehost),
 254                                            NULL);
 255                 if (memcmp(&sb->set_uuid2, hash, 8)==0)
 256                         printf(" (local to host %s)", homehost);
 257         }
 258         printf("\n         Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
 259 }
 260
 261 static void brief_detail_super0(void *sbv)
 262 {
 263         mdp_super_t *sb = sbv;
 264         printf(" UUID=");
 265         if (sb->minor_version >= 90)
 266                 printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
 267                        sb->set_uuid2, sb->set_uuid3);
 268         else
 269                 printf("%08x", sb->set_uuid0);
 270 }
 271 #endif
 272 static void uuid_from_super0(int uuid[4], void * sbv)
 273 {
 274         mdp_super_t *super = sbv;
 275         uuid[0] = super->set_uuid0;
 276         if (super->minor_version >= 90) {
 277                 uuid[1] = super->set_uuid1;
 278                 uuid[2] = super->set_uuid2;
 279                 uuid[3] = super->set_uuid3;
 280         } else {
 281                 uuid[1] = 0;
 282                 uuid[2] = 0;
 283                 uuid[3] = 0;
 284         }
 285 }
 286
 287 static void getinfo_super0(struct mdinfo *info, void *sbv)
 288 {
 289         mdp_super_t *sb = sbv;
 290         int working = 0;
 291         int i;
 292
 293         info->array.major_version = sb->major_version;
 294         info->array.minor_version = sb->minor_version;
 295         info->array.patch_version = sb->patch_version;
 296         info->array.raid_disks = sb->raid_disks;
 297         info->array.level = sb->level;
 298         info->array.layout = sb->layout;
 299         info->array.md_minor = sb->md_minor;
 300         info->array.ctime = sb->ctime;
 301         info->array.utime = sb->utime;
 302         info->array.chunk_size = sb->chunk_size;
 303         info->component_size = sb->size*2;
 304
 305         info->disk.state = sb->this_disk.state;
 306         info->disk.major = sb->this_disk.major;
 307         info->disk.minor = sb->this_disk.minor;
 308         info->disk.raid_disk = sb->this_disk.raid_disk;
 309         info->disk.number = sb->this_disk.number;
 310
 311         info->events = md_event(sb);
 312         info->data_offset = 0;
 313
 314         uuid_from_super0(info->uuid, sbv);
 315
 316         if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
 317                 info->reshape_active = 1;
 318                 info->reshape_progress = sb->reshape_position;
 319                 info->new_level = sb->new_level;
 320                 info->delta_disks = sb->delta_disks;
 321                 info->new_layout = sb->new_layout;
 322                 info->new_chunk = sb->new_chunk;
 323         } else
 324                 info->reshape_active = 0;
 325
 326         info->name[0] = 0;
 327         /* work_disks is calculated rather than read directly */
 328         for (i=0; i < MD_SB_DISKS; i++)
 329                 if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
 330                     (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
 331                     !(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
 332                         working ++;
 333         info->array.working_disks = working;
 334 }
 335
 336
 337 static int update_super0(struct mdinfo *info, void *sbv, char *update,
 338                          char *devname, int verbose,
 339                          int uuid_set, char *homehost)
 340 {
 341         /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
 342          * For others, the return value is ignored.
 343          */
 344         int rv = 0;
 345         mdp_super_t *sb = sbv;
 346         if (strcmp(update, "sparc2.2")==0 ) {
 347                 /* 2.2 sparc put the events in the wrong place
 348                  * So we copy the tail of the superblock
 349                  * up 4 bytes before continuing
 350                  */
 351                 __u32 *sb32 = (__u32*)sb;
 352                 memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
 353                        sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
 354                        (MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
 355                 if (verbose >= 0)
 356                         fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
 357                                  devname);
 358         }
 359         if (strcmp(update, "super-minor") ==0) {
 360                 sb->md_minor = info->array.md_minor;
 361                 if (verbose > 0)
 362                         fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
 363                                 devname, info->array.md_minor);
 364         }
 365         if (strcmp(update, "summaries") == 0) {
 366                 int i;
 367                 /* set nr_disks, active_disks, working_disks,
 368                  * failed_disks, spare_disks based on disks[]
 369                  * array in superblock.
 370                  * Also make sure extra slots aren't 'failed'
 371                  */
 372                 sb->nr_disks = sb->active_disks =
 373                         sb->working_disks = sb->failed_disks =
 374                         sb->spare_disks = 0;
 375                 for (i=0; i < MD_SB_DISKS ; i++)
 376                         if (sb->disks[i].major ||
 377                             sb->disks[i].minor) {
 378                                 int state = sb->disks[i].state;
 379                                 if (state & (1<<MD_DISK_REMOVED))
 380                                         continue;
 381                                 sb->nr_disks++;
 382                                 if (state & (1<<MD_DISK_ACTIVE))
 383                                         sb->active_disks++;
 384                                 if (state & (1<<MD_DISK_FAULTY))
 385                                         sb->failed_disks++;
 386                                 else
 387                                         sb->working_disks++;
 388                                 if (state == 0)
 389                                         sb->spare_disks++;
 390                         } else if (i >= sb->raid_disks && sb->disks[i].number == 0)
 391                                 sb->disks[i].state = 0;
 392         }
 393         if (strcmp(update, "force")==0) {
 394                 __u32 ehi = sb->events_hi, elo = sb->events_lo;
 395                 sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
 396                 sb->events_lo = (info->events) & 0xFFFFFFFF;
 397                 if (sb->events_hi != ehi ||
 398                     sb->events_lo != elo)
 399                         rv = 1;
 400                 if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
 401                     (sb->state & (1 << MD_SB_CLEAN)) == 0) {
 402                         /* need to force clean */
 403                         sb->state |= (1 << MD_SB_CLEAN);
 404                         rv = 1;
 405                 }
 406         }
 407         if (strcmp(update, "assemble")==0) {
 408                 int d = info->disk.number;
 409                 int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
 410                 if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
 411                     != info->disk.state) {
 412                         sb->disks[d].state = info->disk.state | wonly;
 413                         rv = 1;
 414                 }
 415         }
 416         if (strcmp(update, "newdev") == 0) {
 417                 int d = info->disk.number;
 418                 memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
 419                 sb->disks[d].number = d;
 420                 sb->disks[d].major = info->disk.major;
 421                 sb->disks[d].minor = info->disk.minor;
 422                 sb->disks[d].raid_disk = info->disk.raid_disk;
 423                 sb->disks[d].state = info->disk.state;
 424                 sb->this_disk = sb->disks[d];
 425         }
 426         if (strcmp(update, "grow") == 0) {
 427                 sb->raid_disks = info->array.raid_disks;
 428                 sb->nr_disks = info->array.nr_disks;
 429                 sb->active_disks = info->array.active_disks;
 430                 sb->working_disks = info->array.working_disks;
 431                 memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
 432                 sb->disks[info->disk.number].number = info->disk.number;
 433                 sb->disks[info->disk.number].major = info->disk.major;
 434                 sb->disks[info->disk.number].minor = info->disk.minor;
 435                 sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
 436                 sb->disks[info->disk.number].state = info->disk.state;
 437                 if (sb->this_disk.number == info->disk.number)
 438                         sb->this_disk = sb->disks[info->disk.number];
 439         }
 440         if (strcmp(update, "resync") == 0) {
 441                 /* make sure resync happens */
 442                 sb->state &= ~(1<<MD_SB_CLEAN);
 443                 sb->recovery_cp = 0;
 444         }
 445         if (strcmp(update, "uuid") == 0) {
 446                 if (!uuid_set && homehost) {
 447                         unsigned char *hash = SHA1((unsigned char*)homehost,
 448                                                    strlen(homehost),
 449                                                    NULL);
 450                         memcpy(info->uuid+2, hash, 8);
 451                 }
 452                 sb->set_uuid0 = info->uuid[0];
 453                 sb->set_uuid1 = info->uuid[1];
 454                 sb->set_uuid2 = info->uuid[2];
 455                 sb->set_uuid3 = info->uuid[3];
 456                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
 457                         struct bitmap_super_s *bm;
 458                         bm = (struct bitmap_super_s*)(sb+1);
 459                         uuid_from_super0((int*)bm->uuid, sbv);
 460                 }
 461         }
 462         if (strcmp(update, "_reshape_progress")==0)
 463                 sb->reshape_position = info->reshape_progress;
 464
 465         sb->sb_csum = calc_sb0_csum(sb);
 466         return rv;
 467 }
 468
 469 static __u64 event_super0(void *sbv)
 470 {
 471         mdp_super_t *sb = sbv;
 472         return md_event(sb);
 473 }
 474
 475 /*
 476  * For verion-0 superblock, the homehost is 'stored' in the
 477  * uuid.  8 bytes for a hash of the host leaving 8 bytes
 478  * of random material.
 479  * We use the first 8 bytes (64bits) of the sha1 of the
 480  * host name
 481  */
 482
 483
 484 static int init_super0(struct supertype *st, void **sbp, mdu_array_info_t *info,
 485                        unsigned long long size, char *ignored_name, char *homehost)
 486 {
 487         mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 488         int spares;
 489         int rfd;
 490         memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 491
 492         if (info->major_version == -1) {
 493                 /* zeroing the superblock */
 494                 *sbp = sb;
 495                 return 0;
 496         }
 497
 498         spares = info->working_disks - info->active_disks;
 499         if (info->raid_disks + spares  > MD_SB_DISKS) {
 500                 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
 501                         info->raid_disks , spares, MD_SB_DISKS);
 502                 return 0;
 503         }
 504
 505         rfd = open("/dev/urandom", O_RDONLY);
 506         sb->md_magic = MD_SB_MAGIC;
 507         sb->major_version = 0;
 508         sb->minor_version = 90;
 509         sb->patch_version = 0;
 510         sb->gvalid_words = 0; /* ignored */
 511         if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
 512                 sb->set_uuid0 = random();
 513         sb->ctime = time(0);
 514         sb->level = info->level;
 515         if (size != info->size)
 516                 return 0;
 517         sb->size = info->size;
 518         sb->nr_disks = info->nr_disks;
 519         sb->raid_disks = info->raid_disks;
 520         sb->md_minor = info->md_minor;
 521         sb->not_persistent = 0;
 522         if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
 523                 sb->set_uuid1 = random();
 524                 sb->set_uuid2 = random();
 525                 sb->set_uuid3 = random();
 526         }
 527         if (rfd >= 0)
 528                 close(rfd);
 529         if (homehost) {
 530                 unsigned char *hash = SHA1((unsigned char*)homehost,
 531                                            strlen(homehost),
 532                                            NULL);
 533                 memcpy(&sb->set_uuid2, hash, 8);
 534         }
 535
 536         sb->utime = sb->ctime;
 537         sb->state = info->state;
 538         sb->active_disks = info->active_disks;
 539         sb->working_disks = info->working_disks;
 540         sb->failed_disks = info->failed_disks;
 541         sb->spare_disks = info->spare_disks;
 542         sb->events_hi = 0;
 543         sb->events_lo = 1;
 544
 545         sb->layout = info->layout;
 546         sb->chunk_size = info->chunk_size;
 547
 548         *sbp = sb;
 549         return 1;
 550 }
 551
 552 /* Add a device to the superblock being created */
 553 static void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
 554 {
 555         mdp_super_t *sb = sbv;
 556         mdp_disk_t *dk = &sb->disks[dinfo->number];
 557
 558         dk->number = dinfo->number;
 559         dk->major = dinfo->major;
 560         dk->minor = dinfo->minor;
 561         dk->raid_disk = dinfo->raid_disk;
 562         dk->state = dinfo->state;
 563 }
 564
 565 static int store_super0(struct supertype *st, int fd, void *sbv)
 566 {
 567         unsigned long size;
 568         unsigned long long dsize;
 569         unsigned long long offset;
 570         mdp_super_t *super = sbv;
 571
 572 #ifdef BLKGETSIZE64
 573         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 574 #endif
 575         {
 576                 if (ioctl(fd, BLKGETSIZE, &size))
 577                         return 1;
 578                 else
 579                         dsize = ((unsigned long long)size)<<9;
 580         }
 581
 582         if (dsize < MD_RESERVED_SECTORS*2*512)
 583                 return 2;
 584
 585         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 586
 587         offset *= 512;
 588
 589         if (lseek64(fd, offset, 0)< 0LL)
 590                 return 3;
 591
 592         if (write(fd, super, sizeof(*super)) != sizeof(*super))
 593                 return 4;
 594
 595         if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
 596                 struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
 597                 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
 598                         write(fd, bm, sizeof(*bm));
 599         }
 600
 601         fsync(fd);
 602         return 0;
 603 }
 604
 605 static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
 606 {
 607         mdp_super_t *sb = sbv;
 608         int fd = open(devname, O_RDWR|O_EXCL);
 609         int rv;
 610
 611         if (fd < 0) {
 612                 fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
 613                 return -1;
 614         }
 615
 616         sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
 617         sb->disks[dinfo->number].state |= (1<<MD_DISK_SYNC);
 618
 619         sb->this_disk = sb->disks[dinfo->number];
 620         sb->sb_csum = calc_sb0_csum(sb);
 621         rv = store_super0(st, fd, sb);
 622
 623         if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
 624                 rv = st->ss->write_bitmap(st, fd, sbv);
 625
 626         close(fd);
 627         if (rv)
 628                 fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
 629         return rv;
 630 }
 631
 632 static int compare_super0(void **firstp, void *secondv)
 633 {
 634         /*
 635          * return:
 636          *  0 same, or first was empty, and second was copied
 637          *  1 second had wrong number
 638          *  2 wrong uuid
 639          *  3 wrong other info
 640          */
 641         mdp_super_t *first = *firstp;
 642         mdp_super_t *second = secondv;
 643
 644         int uuid1[4], uuid2[4];
 645         if (second->md_magic != MD_SB_MAGIC)
 646                 return 1;
 647         if (!first) {
 648                 first = malloc(MD_SB_BYTES + sizeof(struct bitmap_super_s));
 649                 memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 650                 *firstp = first;
 651                 return 0;
 652         }
 653
 654         uuid_from_super0(uuid1, first);
 655         uuid_from_super0(uuid2, second);
 656         if (!same_uuid(uuid1, uuid2, 0))
 657                 return 2;
 658         if (first->major_version != second->major_version ||
 659             first->minor_version != second->minor_version ||
 660             first->patch_version != second->patch_version ||
 661             first->gvalid_words  != second->gvalid_words  ||
 662             first->ctime         != second->ctime         ||
 663             first->level         != second->level         ||
 664             first->size          != second->size          ||
 665             first->raid_disks    != second->raid_disks    )
 666                 return 3;
 667
 668         return 0;
 669 }
 670
 671
 672 static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
 673 {
 674         /* try to read in the superblock
 675          * Return:
 676          *  0 on success
 677          *  1 on cannot get superblock
 678          *  2 on superblock meaningless
 679          */
 680         unsigned long size;
 681         unsigned long long dsize;
 682         unsigned long long offset;
 683         mdp_super_t *super;
 684         int uuid[4];
 685         struct bitmap_super_s *bsb;
 686
 687 #ifdef BLKGETSIZE64
 688         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 689 #endif
 690         {
 691                 if (ioctl(fd, BLKGETSIZE, &size)) {
 692                         if (devname)
 693                                 fprintf(stderr, Name ": cannot find device size for %s: %s\n",
 694                                         devname, strerror(errno));
 695                         return 1;
 696                 } else
 697                         dsize = size << 9;
 698         }
 699
 700         if (dsize < MD_RESERVED_SECTORS*2) {
 701                 if (devname)
 702                         fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
 703                                 devname, size);
 704                 return 1;
 705         }
 706
 707         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 708
 709         offset *= 512;
 710
 711         ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
 712
 713         if (lseek64(fd, offset, 0)< 0LL) {
 714                 if (devname)
 715                         fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
 716                                 devname, strerror(errno));
 717                 return 1;
 718         }
 719
 720         super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
 721
 722         if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 723                 if (devname)
 724                         fprintf(stderr, Name ": Cannot read superblock on %s\n",
 725                                 devname);
 726                 free(super);
 727                 return 1;
 728         }
 729
 730         if (st->ss && st->minor_version == 9)
 731                 super0_swap_endian(super);
 732
 733         if (super->md_magic != MD_SB_MAGIC) {
 734                 if (devname)
 735                         fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
 736                                 devname, MD_SB_MAGIC, super->md_magic);
 737                 free(super);
 738                 return 2;
 739         }
 740
 741         if (super->major_version != 0) {
 742                 if (devname)
 743                         fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
 744                                 devname, super->major_version);
 745                 free(super);
 746                 return 2;
 747         }
 748         *sbp = super;
 749         if (st->ss == NULL) {
 750                 st->ss = &super0;
 751                 st->minor_version = 90;
 752                 st->max_devs = MD_SB_DISKS;
 753         }
 754
 755         /* Now check on the bitmap superblock */
 756         if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
 757                 return 0;
 758         /* Read the bitmap superblock and make sure it looks
 759          * valid.  If it doesn't clear the bit.  An --assemble --force
 760          * should get that written out.
 761          */
 762         if (read(fd, super+1, sizeof(struct bitmap_super_s))
 763             != sizeof(struct bitmap_super_s))
 764                 goto no_bitmap;
 765
 766         uuid_from_super0(uuid, super);
 767         bsb = (struct bitmap_super_s *)(super+1);
 768         if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
 769             memcmp(bsb->uuid, uuid, 16) != 0)
 770                 goto no_bitmap;
 771         return 0;
 772
 773  no_bitmap:
 774         super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
 775
 776         return 0;
 777 }
 778
 779 static struct supertype *match_metadata_desc0(char *arg)
 780 {
 781         struct supertype *st = malloc(sizeof(*st));
 782         if (!st) return st;
 783
 784         st->ss = &super0;
 785         st->minor_version = 90;
 786         st->max_devs = MD_SB_DISKS;
 787         if (strcmp(arg, "0") == 0 ||
 788             strcmp(arg, "0.90") == 0 ||
 789             strcmp(arg, "default") == 0
 790                 )
 791                 return st;
 792
 793         st->minor_version = 9; /* flag for 'byte-swapped' */
 794         if (strcmp(arg, "0.swap")==0)
 795                 return st;
 796
 797         free(st);
 798         return NULL;
 799 }
 800
 801 static __u64 avail_size0(struct supertype *st, __u64 devsize)
 802 {
 803         if (devsize < MD_RESERVED_SECTORS*2)
 804                 return 0ULL;
 805         return MD_NEW_SIZE_SECTORS(devsize);
 806 }
 807
 808 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)
 809 {
 810         /*
 811          * The bitmap comes immediately after the superblock and must be 60K in size
 812          * at most.  The default size is between 30K and 60K
 813          *
 814          * size is in sectors,  chunk is in bytes !!!
 815          */
 816         unsigned long long bits;
 817         unsigned long long max_bits = 60*1024*8;
 818         unsigned long long min_chunk;
 819         mdp_super_t *sb = sbv;
 820         bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
 821
 822
 823         min_chunk = 4096; /* sub-page chunks don't work yet.. */
 824         bits = (size * 512) / min_chunk + 1;
 825         while (bits > max_bits) {
 826                 min_chunk *= 2;
 827                 bits = (bits+1)/2;
 828         }
 829         if (chunk == UnSet)
 830                 chunk = min_chunk;
 831         else if (chunk < min_chunk)
 832                 return 0; /* chunk size too small */
 833
 834         sb->state |= (1<<MD_SB_BITMAP_PRESENT);
 835
 836         memset(bms, 0, sizeof(*bms));
 837         bms->magic = __cpu_to_le32(BITMAP_MAGIC);
 838         bms->version = __cpu_to_le32(major);
 839         uuid_from_super0((int*)bms->uuid, sb);
 840         bms->chunksize = __cpu_to_le32(chunk);
 841         bms->daemon_sleep = __cpu_to_le32(delay);
 842         bms->sync_size = __cpu_to_le64(size);
 843         bms->write_behind = __cpu_to_le32(write_behind);
 844
 845         return 1;
 846 }
 847
 848
 849 void locate_bitmap0(struct supertype *st, int fd, void *sbv)
 850 {
 851         unsigned long long dsize;
 852         unsigned long size;
 853         unsigned long long offset;
 854 #ifdef BLKGETSIZE64
 855         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 856 #endif
 857         {
 858                 if (ioctl(fd, BLKGETSIZE, &size))
 859                         return;
 860                 else
 861                         dsize = ((unsigned long long)size)<<9;
 862         }
 863
 864         if (dsize < MD_RESERVED_SECTORS*2)
 865                 return;
 866
 867         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 868
 869         offset *= 512;
 870
 871         offset += MD_SB_BYTES;
 872
 873         lseek64(fd, offset, 0);
 874 }
 875
 876 int write_bitmap0(struct supertype *st, int fd, void *sbv)
 877 {
 878         unsigned long size;
 879         unsigned long long dsize;
 880         unsigned long long offset;
 881         mdp_super_t *sb = sbv;
 882
 883         int rv = 0;
 884
 885         int towrite, n;
 886         char buf[4096];
 887
 888 #ifdef BLKGETSIZE64
 889         if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
 890 #endif
 891         {
 892                 if (ioctl(fd, BLKGETSIZE, &size))
 893                         return 1;
 894                 else
 895                         dsize = ((unsigned long long)size)<<9;
 896         }
 897
 898         if (dsize < MD_RESERVED_SECTORS*2)
 899         return -1;
 900
 901         offset = MD_NEW_SIZE_SECTORS(dsize>>9);
 902
 903         offset *= 512;
 904
 905         if (lseek64(fd, offset + 4096, 0)< 0LL)
 906                 return 3;
 907
 908
 909         if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
 910             sizeof(bitmap_super_t))
 911                 return -2;
 912         towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
 913         memset(buf, 0xff, sizeof(buf));
 914         while (towrite > 0) {
 915                 n = towrite;
 916                 if (n > sizeof(buf))
 917                         n = sizeof(buf);
 918                 n = write(fd, buf, n);
 919                 if (n > 0)
 920                         towrite -= n;
 921                 else
 922                         break;
 923         }
 924         fsync(fd);
 925         if (towrite)
 926                 rv = -2;
 927
 928         return rv;
 929 }
 930
 931 struct superswitch super0 = {
 932 #ifndef MDASSEMBLE
 933         .examine_super = examine_super0,
 934         .brief_examine_super = brief_examine_super0,
 935         .detail_super = detail_super0,
 936         .brief_detail_super = brief_detail_super0,
 937 #endif
 938         .uuid_from_super = uuid_from_super0,
 939         .getinfo_super = getinfo_super0,
 940         .update_super = update_super0,
 941         .event_super = event_super0,
 942         .init_super = init_super0,
 943         .add_to_super = add_to_super0,
 944         .store_super = store_super0,
 945         .write_init_super = write_init_super0,
 946         .compare_super = compare_super0,
 947         .load_super = load_super0,
 948         .match_metadata_desc = match_metadata_desc0,
 949         .avail_size = avail_size0,
 950         .add_internal_bitmap = add_internal_bitmap0,
 951         .locate_bitmap = locate_bitmap0,
 952         .write_bitmap = write_bitmap0,
 953         .major = 0,
 954         .swapuuid = 0,
 955 };