release/src/router/mdadm/Create.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        "md_u.h"
  32 #include        "md_p.h"
  33 #include        <ctype.h>
  34
  35 int Create(struct supertype *st, char *mddev, int mdfd,
  36            int chunk, int level, int layout, unsigned long long size, int raiddisks, int sparedisks,
  37            char *name, char *homehost, int *uuid,
  38            int subdevs, mddev_dev_t devlist,
  39            int runstop, int verbose, int force, int assume_clean,
  40            char *bitmap_file, int bitmap_chunk, int write_behind, int delay)
  41 {
  42         /*
  43          * Create a new raid array.
  44          *
  45          * First check that necessary details are available
  46          * (i.e. level, raid-disks)
  47          *
  48          * Then check each disk to see what might be on it
  49          * and report anything interesting.
  50          *
  51          * If anything looks odd, and runstop not set,
  52          * abort.
  53          *
  54          * SET_ARRAY_INFO and ADD_NEW_DISK, and
  55          * if runstop==run, or raiddisks disks were used,
  56          * RUN_ARRAY
  57          */
  58         unsigned long long minsize=0, maxsize=0;
  59         char *mindisc = NULL;
  60         char *maxdisc = NULL;
  61         int dnum;
  62         mddev_dev_t dv;
  63         int fail=0, warn=0;
  64         struct stat stb;
  65         int first_missing = subdevs * 2;
  66         int missing_disks = 0;
  67         int insert_point = subdevs * 2; /* where to insert a missing drive */
  68         void *super;
  69         int pass;
  70         int vers;
  71         int rv;
  72         int bitmap_fd;
  73         unsigned long long bitmapsize;
  74
  75         mdu_array_info_t array;
  76         int major = BITMAP_MAJOR_HI;
  77
  78         memset(&array, 0, sizeof(array));
  79
  80         vers = md_get_version(mdfd);
  81         if (vers < 9000) {
  82                 fprintf(stderr, Name ": Create requires md driver version 0.90.0 or later\n");
  83                 return 1;
  84         }
  85         if (level == UnSet) {
  86                 fprintf(stderr,
  87                         Name ": a RAID level is needed to create an array.\n");
  88                 return 1;
  89         }
  90         if (raiddisks < 1) {
  91                 fprintf(stderr,
  92                         Name ": a number of --raid-devices must be given to create an array\n");
  93                 return 1;
  94         }
  95         if (raiddisks < 4 && level == 6) {
  96                 fprintf(stderr,
  97                         Name ": at least 4 raid-devices needed for level 6\n");
  98                 return 1;
  99         }
 100         if (raiddisks > 256 && level == 6) {
 101                 fprintf(stderr,
 102                         Name ": no more than 256 raid-devices supported for level 6\n");
 103                 return 1;
 104         }
 105         if (raiddisks < 2 && level >= 4) {
 106                 fprintf(stderr,
 107                         Name ": at least 2 raid-devices needed for level 4 or 5\n");
 108                 return 1;
 109         }
 110         if (subdevs > raiddisks+sparedisks) {
 111                 fprintf(stderr, Name ": You have listed more devices (%d) than are in the array(%d)!\n", subdevs, raiddisks+sparedisks);
 112                 return 1;
 113         }
 114         if (subdevs < raiddisks+sparedisks) {
 115                 fprintf(stderr, Name ": You haven't given enough devices (real or missing) to create this array\n");
 116                 return 1;
 117         }
 118
 119         /* now set some defaults */
 120         if (layout == UnSet)
 121                 switch(level) {
 122                 default: /* no layout */
 123                         layout = 0;
 124                         break;
 125                 case 10:
 126                         layout = 0x102; /* near=2, far=1 */
 127                         if (verbose > 0)
 128                                 fprintf(stderr,
 129                                         Name ": layout defaults to n1\n");
 130                         break;
 131                 case 5:
 132                 case 6:
 133                         layout = map_name(r5layout, "default");
 134                         if (verbose > 0)
 135                                 fprintf(stderr,
 136                                         Name ": layout defaults to %s\n", map_num(r5layout, layout));
 137                         break;
 138                 case LEVEL_FAULTY:
 139                         layout = map_name(faultylayout, "default");
 140
 141                         if (verbose > 0)
 142                                 fprintf(stderr,
 143                                         Name ": layout defaults to %s\n", map_num(faultylayout, layout));
 144                         break;
 145                 }
 146
 147         if (level == 10)
 148                 /* check layout fits in array*/
 149                 if ((layout&255) * ((layout>>8)&255) > raiddisks) {
 150                         fprintf(stderr, Name ": that layout requires at least %d devices\n",
 151                                 (layout&255) * ((layout>>8)&255));
 152                         return 1;
 153                 }
 154
 155         switch(level) {
 156         case 4:
 157         case 5:
 158         case 10:
 159         case 6:
 160         case 0:
 161         case -1: /* linear */
 162                 if (chunk == 0) {
 163                         chunk = 64;
 164                         if (verbose > 0)
 165                                 fprintf(stderr, Name ": chunk size defaults to 64K\n");
 166                 }
 167                 break;
 168         default: /* raid1, multipath */
 169                 if (chunk) {
 170                         chunk = 0;
 171                         if (verbose > 0)
 172                                 fprintf(stderr, Name ": chunk size ignored for this level\n");
 173                 }
 174                 break;
 175         }
 176
 177         /* now look at the subdevs */
 178         array.active_disks = 0;
 179         array.working_disks = 0;
 180         dnum = 0;
 181         for (dv=devlist; dv; dv=dv->next, dnum++) {
 182                 char *dname = dv->devname;
 183                 unsigned long long ldsize, freesize;
 184                 int fd;
 185                 if (strcasecmp(dname, "missing")==0) {
 186                         if (first_missing > dnum)
 187                                 first_missing = dnum;
 188                         missing_disks ++;
 189                         continue;
 190                 }
 191                 array.working_disks++;
 192                 if (dnum < raiddisks)
 193                         array.active_disks++;
 194                 fd = open(dname, O_RDONLY|O_EXCL, 0);
 195                 if (fd <0 ) {
 196                         fprintf(stderr, Name ": Cannot open %s: %s\n",
 197                                 dname, strerror(errno));
 198                         fail=1;
 199                         continue;
 200                 }
 201                 if (!get_dev_size(fd, dname, &ldsize)) {
 202                         fail = 1;
 203                         close(fd);
 204                         continue;
 205                 }
 206                 if (st == NULL) {
 207                         struct createinfo *ci = conf_get_create_info();
 208                         if (ci)
 209                                 st = ci->supertype;
 210                 }
 211                 if (st == NULL) {
 212                         /* Need to choose a default metadata, which is different
 213                          * depending on the sizes of devices
 214                          */
 215                         int i;
 216                         char *name = "default";
 217                         if (level >= 1 && ldsize > (0x7fffffffULL<<10))
 218                                 name = "default/large";
 219                         for(i=0; !st && superlist[i]; i++)
 220                                 st = superlist[i]->match_metadata_desc(name);
 221
 222                         if (!st) {
 223                                 fprintf(stderr, Name ": internal error - no default metadata style\n");
 224                                 exit(2);
 225                         }
 226                         if (st->ss->major != 0 ||
 227                             st->minor_version != 90)
 228                                 fprintf(stderr, Name ": Defaulting to verion %d.%d metadata\n",
 229                                         st->ss->major,
 230                                         st->minor_version);
 231                 }
 232                 freesize = st->ss->avail_size(st, ldsize >> 9);
 233                 if (freesize == 0) {
 234                         fprintf(stderr, Name ": %s is too small: %luK\n",
 235                                 dname, (unsigned long)(ldsize>>10));
 236                         fail = 1;
 237                         close(fd);
 238                         continue;
 239                 }
 240
 241                 freesize /= 2; /* convert to K */
 242                 if (chunk) {
 243                         /* round to chunk size */
 244                         freesize = freesize & ~(chunk-1);
 245                 }
 246
 247                 if (size && freesize < size) {
 248                         fprintf(stderr, Name ": %s is smaller that given size."
 249                                 " %lluK < %lluK + superblock\n", dname, freesize, size);
 250                         fail = 1;
 251                         close(fd);
 252                         continue;
 253                 }
 254                 if (maxdisc == NULL || (maxdisc && freesize > maxsize)) {
 255                         maxdisc = dname;
 256                         maxsize = freesize;
 257                 }
 258                 if (mindisc ==NULL || (mindisc && freesize < minsize)) {
 259                         mindisc = dname;
 260                         minsize = freesize;
 261                 }
 262                 if (runstop != 1 || verbose >= 0) {
 263                         warn |= check_ext2(fd, dname);
 264                         warn |= check_reiser(fd, dname);
 265                         warn |= check_raid(fd, dname);
 266                 }
 267                 close(fd);
 268         }
 269         if (fail) {
 270                 fprintf(stderr, Name ": create aborted\n");
 271                 return 1;
 272         }
 273         if (size == 0) {
 274                 if (mindisc == NULL) {
 275                         fprintf(stderr, Name ": no size and no drives given - aborting create.\n");
 276                         return 1;
 277                 }
 278                 if (level > 0 || level == LEVEL_MULTIPATH || level == LEVEL_FAULTY) {
 279                         /* size is meaningful */
 280                         if (minsize > 0x100000000ULL && st->ss->major == 0) {
 281                                 fprintf(stderr, Name ": devices too large for RAID level %d\n", level);
 282                                 return 1;
 283                         }
 284                         size = minsize;
 285                         if (verbose > 0)
 286                                 fprintf(stderr, Name ": size set to %lluK\n", size);
 287                 }
 288         }
 289         if (level > 0 && ((maxsize-size)*100 > maxsize)) {
 290                 if (runstop != 1 || verbose >= 0)
 291                         fprintf(stderr, Name ": largest drive (%s) exceed size (%lluK) by more than 1%%\n",
 292                                 maxdisc, size);
 293                 warn = 1;
 294         }
 295
 296         if (warn) {
 297                 if (runstop!= 1) {
 298                         if (!ask("Continue creating array? ")) {
 299                                 fprintf(stderr, Name ": create aborted.\n");
 300                                 return 1;
 301                         }
 302                 } else {
 303                         if (verbose > 0)
 304                                 fprintf(stderr, Name ": creation continuing despite oddities due to --run\n");
 305                 }
 306         }
 307
 308         /* If this is  raid5, we want to configure the last active slot
 309          * as missing, so that a reconstruct happens (faster than re-parity)
 310          * FIX: Can we do this for raid6 as well?
 311          */
 312         if (assume_clean==0 && force == 0 && first_missing >= raiddisks) {
 313                 switch ( level ) {
 314                 case 5:
 315                         insert_point = raiddisks-1;
 316                         sparedisks++;
 317                         array.active_disks--;
 318                         missing_disks++;
 319                         break;
 320                 default:
 321                         break;
 322                 }
 323         }
 324
 325         /* Ok, lets try some ioctls */
 326
 327         array.level = level;
 328         array.size = size;
 329         array.raid_disks = raiddisks;
 330         /* The kernel should *know* what md_minor we are dealing
 331          * with, but it chooses to trust me instead. Sigh
 332          */
 333         array.md_minor = 0;
 334         if (fstat(mdfd, &stb)==0)
 335                 array.md_minor = minor(stb.st_rdev);
 336         array.not_persistent = 0;
 337         /*** FIX: Need to do something about RAID-6 here ***/
 338         if ( ( (level == 5) &&
 339                (insert_point < raiddisks || first_missing < raiddisks) )
 340              ||
 341              ( level == 6 && missing_disks == 2)
 342              ||
 343              assume_clean
 344                 )
 345                 array.state = 1; /* clean, but one+ drive will be missing */
 346         else
 347                 array.state = 0; /* not clean, but no errors */
 348
 349         if (level == 10) {
 350                 /* for raid10, the bitmap size is the capacity of the array,
 351                  * which is array.size * raid_disks / ncopies;
 352                  * .. but convert to sectors.
 353                  */
 354                 int ncopies = ((layout>>8) & 255) * (layout & 255);
 355                 bitmapsize = (unsigned long long)size * raiddisks / ncopies * 2;
 356 /*              printf("bms=%llu as=%d rd=%d nc=%d\n", bitmapsize, size, raiddisks, ncopies);*/
 357         } else
 358                 bitmapsize = (unsigned long long)size * 2;
 359
 360         /* There is lots of redundancy in these disk counts,
 361          * raid_disks is the most meaningful value
 362          *          it describes the geometry of the array
 363          *          it is constant
 364          * nr_disks is total number of used slots.
 365          *          it should be raid_disks+spare_disks
 366          * spare_disks is the number of extra disks present
 367          *          see above
 368          * active_disks is the number of working disks in
 369          *          active slots. (With raid_disks)
 370          * working_disks is the total number of working disks,
 371          *          including spares
 372          * failed_disks is the number of disks marked failed
 373          *
 374          * Ideally, the kernel would keep these (except raid_disks)
 375          * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
 376          * So for now, we assume that all raid and spare
 377          * devices will be given.
 378          */
 379         array.spare_disks=sparedisks;
 380         array.failed_disks=missing_disks;
 381         array.nr_disks = array.working_disks + array.failed_disks;
 382         array.layout = layout;
 383         array.chunk_size = chunk*1024;
 384         array.major_version = st->ss->major;
 385
 386         if (name == NULL || *name == 0) {
 387                 /* base name on mddev */
 388                 /*  /dev/md0 -> 0
 389                  *  /dev/md_d0 -> d0
 390                  *  /dev/md/1 -> 1
 391                  *  /dev/md/d1 -> d1
 392                  *  /dev/md/home -> home
 393                  *  /dev/mdhome -> home
 394                  */
 395                 name = strrchr(mddev, '/');
 396                 if (name) {
 397                         name++;
 398                         if (strncmp(name, "md_d", 4)==0 &&
 399                             strlen(name) > 4 &&
 400                             isdigit(name[4]) &&
 401                             (name-mddev) == 5 /* /dev/ */)
 402                                 name += 3;
 403                         else if (strncmp(name, "md", 2)==0 &&
 404                                  strlen(name) > 2 &&
 405                                  isdigit(name[2]) &&
 406                                  (name-mddev) == 5 /* /dev/ */)
 407                                 name += 2;
 408                 }
 409         }
 410         if (!st->ss->init_super(st, &super, &array, size, name, homehost, uuid))
 411                 return 1;
 412
 413         if (bitmap_file && vers < 9003) {
 414                 major = BITMAP_MAJOR_HOSTENDIAN;
 415 #ifdef __BIG_ENDIAN
 416                 fprintf(stderr, Name ": Warning - bitmaps created on this kernel are not portable\n"
 417                         "  between different architectured.  Consider upgrading the Linux kernel.\n");
 418 #endif
 419         }
 420
 421         if (bitmap_file && strcmp(bitmap_file, "internal")==0) {
 422                 if ((vers%100) < 2) {
 423                         fprintf(stderr, Name ": internal bitmaps not supported by this kernel.\n");
 424                         return 1;
 425                 }
 426                 if (!st->ss->add_internal_bitmap(st, super, &bitmap_chunk,
 427                                                  delay, write_behind,
 428                                                  bitmapsize, 1, major)) {
 429                         fprintf(stderr, Name ": Given bitmap chunk size not supported.\n");
 430                         return 1;
 431                 }
 432                 bitmap_file = NULL;
 433         }
 434
 435
 436
 437         if ((vers % 100) >= 1) { /* can use different versions */
 438                 mdu_array_info_t inf;
 439                 memset(&inf, 0, sizeof(inf));
 440                 inf.major_version = st->ss->major;
 441                 inf.minor_version = st->minor_version;
 442                 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
 443         } else
 444                 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
 445         if (rv) {
 446                 fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
 447                         mddev, strerror(errno));
 448                 return 1;
 449         }
 450
 451         if (bitmap_file) {
 452                 int uuid[4];
 453
 454                 st->ss->uuid_from_super(uuid, super);
 455                 if (CreateBitmap(bitmap_file, force, (char*)uuid, bitmap_chunk,
 456                                  delay, write_behind,
 457                                  bitmapsize,
 458                                  major)) {
 459                         return 1;
 460                 }
 461                 bitmap_fd = open(bitmap_file, O_RDWR);
 462                 if (bitmap_fd < 0) {
 463                         fprintf(stderr, Name ": weird: %s cannot be openned\n",
 464                                 bitmap_file);
 465                         return 1;
 466                 }
 467                 if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
 468                         fprintf(stderr, Name ": Cannot set bitmap file for %s: %s\n",
 469                                 mddev, strerror(errno));
 470                         return 1;
 471                 }
 472         }
 473
 474
 475
 476         for (pass=1; pass <=2 ; pass++) {
 477                 mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
 478
 479                 for (dnum=0, dv = devlist ; dv ;
 480                      dv=(dv->next)?(dv->next):moved_disk, dnum++) {
 481                         int fd;
 482                         struct stat stb;
 483                         mdu_disk_info_t disk;
 484
 485                         disk.number = dnum;
 486                         if (dnum == insert_point) {
 487                                 moved_disk = dv;
 488                         }
 489                         disk.raid_disk = disk.number;
 490                         if (disk.raid_disk < raiddisks)
 491                                 disk.state = (1<<MD_DISK_ACTIVE) |
 492                                                 (1<<MD_DISK_SYNC);
 493                         else
 494                                 disk.state = 0;
 495                         if (dv->writemostly)
 496                                 disk.state |= (1<<MD_DISK_WRITEMOSTLY);
 497
 498                         if (dnum == insert_point ||
 499                             strcasecmp(dv->devname, "missing")==0) {
 500                                 disk.major = 0;
 501                                 disk.minor = 0;
 502                                 disk.state = (1<<MD_DISK_FAULTY);
 503                         } else {
 504                                 fd = open(dv->devname, O_RDONLY|O_EXCL, 0);
 505                                 if (fd < 0) {
 506                                         fprintf(stderr, Name ": failed to open %s after earlier success - aborting\n",
 507                                                 dv->devname);
 508                                         return 1;
 509                                 }
 510                                 fstat(fd, &stb);
 511                                 disk.major = major(stb.st_rdev);
 512                                 disk.minor = minor(stb.st_rdev);
 513                                 remove_partitions(fd);
 514                                 close(fd);
 515                         }
 516                         switch(pass){
 517                         case 1:
 518                                 st->ss->add_to_super(super, &disk);
 519                                 break;
 520                         case 2:
 521                                 if (disk.state == 1) break;
 522                                 Kill(dv->devname, 0, 1); /* Just be sure it is clean */
 523                                 Kill(dv->devname, 0, 1); /* and again, there could be two superblocks */
 524                                 st->ss->write_init_super(st, super, &disk, dv->devname);
 525
 526                                 if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
 527                                         fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
 528                                                 dv->devname, strerror(errno));
 529                                         free(super);
 530                                         return 1;
 531                                 }
 532
 533                                 break;
 534                         }
 535                         if (dv == moved_disk && dnum != insert_point) break;
 536                 }
 537         }
 538         free(super);
 539
 540         /* param is not actually used */
 541         if (runstop == 1 || subdevs >= raiddisks) {
 542                 mdu_param_t param;
 543                 if (ioctl(mdfd, RUN_ARRAY, &param)) {
 544                         fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
 545                                 strerror(errno));
 546                         Manage_runstop(mddev, mdfd, -1, 0);
 547                         return 1;
 548                 }
 549                 if (verbose >= 0)
 550                         fprintf(stderr, Name ": array %s started.\n", mddev);
 551         } else {
 552                 fprintf(stderr, Name ": not starting array - not enough devices.\n");
 553         }
 554         return 0;
 555 }