Detail.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2012 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@suse.de>
  23  */
  24
  25 #include        "mdadm.h"
  26 #include        "md_p.h"
  27 #include        "md_u.h"
  28 #include        <dirent.h>
  29
  30 int Detail(char *dev, struct context *c)
  31 {
  32         /*
  33          * Print out details for an md array by using
  34          * GET_ARRAY_INFO and GET_DISK_INFO ioctl calls
  35          */
  36
  37         int fd = open(dev, O_RDONLY);
  38         int vers;
  39         mdu_array_info_t array;
  40         mdu_disk_info_t *disks;
  41         int next;
  42         int d;
  43         time_t atime;
  44         char *str;
  45         char *devices = NULL;
  46         int spares = 0;
  47         struct stat stb;
  48         int is_26 = get_linux_version() >= 2006000;
  49         int is_rebuilding = 0;
  50         int failed = 0;
  51         struct supertype *st;
  52         char *subarray = NULL;
  53         int max_disks = MD_SB_DISKS; /* just a default */
  54         struct mdinfo *info = NULL;
  55         struct mdinfo *sra;
  56         char *member = NULL;
  57         char *container = NULL;
  58
  59         int rv = c->test ? 4 : 1;
  60         int avail_disks = 0;
  61         char *avail = NULL;
  62
  63         if (fd < 0) {
  64                 pr_err("cannot open %s: %s\n",
  65                         dev, strerror(errno));
  66                 return rv;
  67         }
  68         vers = md_get_version(fd);
  69         if (vers < 0) {
  70                 pr_err("%s does not appear to be an md device\n",
  71                         dev);
  72                 close(fd);
  73                 return rv;
  74         }
  75         if (vers < 9000) {
  76                 pr_err("cannot get detail for md device %s: driver version too old.\n",
  77                         dev);
  78                 close(fd);
  79                 return rv;
  80         }
  81         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
  82                 if (errno == ENODEV)
  83                         pr_err("md device %s does not appear to be active.\n",
  84                                 dev);
  85                 else
  86                         pr_err("cannot get array detail for %s: %s\n",
  87                                 dev, strerror(errno));
  88                 close(fd);
  89                 return rv;
  90         }
  91         sra = sysfs_read(fd, 0, GET_VERSION);
  92         st = super_by_fd(fd, &subarray);
  93
  94         if (fstat(fd, &stb) != 0 && !S_ISBLK(stb.st_mode))
  95                 stb.st_rdev = 0;
  96         rv = 0;
  97
  98         if (st)
  99                 max_disks = st->max_devs;
 100
 101         if (subarray) {
 102                 /* This is a subarray of some container.
 103                  * We want the name of the container, and the member
 104                  */
 105                 int dn = st->container_dev;
 106
 107                 member = subarray;
 108                 container = map_dev_preferred(dev2major(dn), dev2minor(dn), 1, c->prefer);
 109         }
 110
 111         /* try to load a superblock */
 112         if (st) for (d = 0; d < max_disks; d++) {
 113                 mdu_disk_info_t disk;
 114                 char *dv;
 115                 int fd2;
 116                 int err;
 117                 disk.number = d;
 118                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
 119                         continue;
 120                 if (d >= array.raid_disks &&
 121                     disk.major == 0 &&
 122                     disk.minor == 0)
 123                         continue;
 124
 125                 if (array.raid_disks > 0 &&
 126                     (disk.state & (1 << MD_DISK_ACTIVE)) == 0)
 127                         continue;
 128
 129                 dv = map_dev(disk.major, disk.minor, 1);
 130                 if (!dv)
 131                         continue;
 132
 133                 fd2 = dev_open(dv, O_RDONLY);
 134                 if (fd2 < 0)
 135                         continue;
 136
 137                 if (st->sb)
 138                         st->ss->free_super(st);
 139
 140                 err = st->ss->load_super(st, fd2, NULL);
 141                 close(fd2);
 142                 if (err)
 143                         continue;
 144                 if (info)
 145                         free(info);
 146                 if (subarray)
 147                         info = st->ss->container_content(st, subarray);
 148                 else {
 149                         info = xmalloc(sizeof(*info));
 150                         st->ss->getinfo_super(st, info, NULL);
 151                 }
 152                 if (!info)
 153                         continue;
 154
 155                 if (array.raid_disks != 0 && /* container */
 156                     (info->array.ctime != array.ctime ||
 157                      info->array.level != array.level)) {
 158                         st->ss->free_super(st);
 159                         continue;
 160                 }
 161                 /* some formats (imsm) have free-floating-spares
 162                  * with a uuid of uuid_zero, they don't
 163                  * have very good info about the rest of the
 164                  * container, so keep searching when
 165                  * encountering such a device.  Otherwise, stop
 166                  * after the first successful call to
 167                  * ->load_super.
 168                  */
 169                 if (memcmp(uuid_zero,
 170                            info->uuid,
 171                            sizeof(uuid_zero)) == 0) {
 172                         st->ss->free_super(st);
 173                         continue;
 174                 }
 175                 break;
 176         }
 177
 178         /* Ok, we have some info to print... */
 179         str = map_num(pers, array.level);
 180
 181         if (c->export) {
 182                 if (array.raid_disks) {
 183                         if (str)
 184                                 printf("MD_LEVEL=%s\n", str);
 185                         printf("MD_DEVICES=%d\n", array.raid_disks);
 186                 } else {
 187                         printf("MD_LEVEL=container\n");
 188                         printf("MD_DEVICES=%d\n", array.nr_disks);
 189                 }
 190                 if (container) {
 191                         printf("MD_CONTAINER=%s\n", container);
 192                         printf("MD_MEMBER=%s\n", member);
 193                 } else {
 194                         if (sra && sra->array.major_version < 0)
 195                                 printf("MD_METADATA=%s\n", sra->text_version);
 196                         else
 197                                 printf("MD_METADATA=%d.%d\n",
 198                                        array.major_version, array.minor_version);
 199                 }
 200
 201                 if (st && st->sb && info) {
 202                         char nbuf[64];
 203                         struct map_ent *mp, *map = NULL;
 204
 205                         fname_from_uuid(st, info, nbuf, ':');
 206                         printf("MD_UUID=%s\n", nbuf+5);
 207                         mp = map_by_uuid(&map, info->uuid);
 208                         if (mp && mp->path &&
 209                             strncmp(mp->path, "/dev/md/", 8) == 0) {
 210                                 printf("MD_DEVNAME=");
 211                                 print_escape(mp->path+8);
 212                                 putchar('\n');
 213                         }
 214
 215                         if (st->ss->export_detail_super)
 216                                 st->ss->export_detail_super(st);
 217                 } else {
 218                         struct map_ent *mp, *map = NULL;
 219                         char nbuf[64];
 220                         mp = map_by_devnum(&map, fd2devnum(fd));
 221                         if (mp) {
 222                                 __fname_from_uuid(mp->uuid, 0, nbuf, ':');
 223                                 printf("MD_UUID=%s\n", nbuf+5);
 224                         }
 225                         if (mp && mp->path &&
 226                             strncmp(mp->path, "/dev/md/", 8) == 0) {
 227                                 printf("MD_DEVNAME=");
 228                                 print_escape(mp->path+8);
 229                                 putchar('\n');
 230                         }
 231                 }
 232                 goto out;
 233         }
 234
 235         disks = xmalloc(max_disks * sizeof(mdu_disk_info_t));
 236         for (d = 0; d < max_disks; d++) {
 237                 disks[d].state = (1<<MD_DISK_REMOVED);
 238                 disks[d].major = disks[d].minor = 0;
 239                 disks[d].number = disks[d].raid_disk = d;
 240         }
 241
 242         next = array.raid_disks;
 243         for (d = 0; d < max_disks; d++) {
 244                 mdu_disk_info_t disk;
 245                 disk.number = d;
 246                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
 247                         if (d < array.raid_disks)
 248                                 pr_err("cannot get device detail for device %d: %s\n",
 249                                         d, strerror(errno));
 250                         continue;
 251                 }
 252                 if (disk.major == 0 && disk.minor == 0)
 253                         continue;
 254                 if (disk.raid_disk >= 0 && disk.raid_disk < array.raid_disks)
 255                         disks[disk.raid_disk] = disk;
 256                 else if (next < max_disks)
 257                         disks[next++] = disk;
 258         }
 259
 260         avail = xcalloc(array.raid_disks, 1);
 261
 262         for (d= 0; d < array.raid_disks; d++) {
 263                 mdu_disk_info_t disk = disks[d];
 264
 265                 if ((disk.state & (1<<MD_DISK_SYNC))) {
 266                         avail_disks ++;
 267                         avail[d] = 1;
 268                 }
 269         }
 270
 271         if (c->brief) {
 272                 mdu_bitmap_file_t bmf;
 273                 printf("ARRAY %s", dev);
 274                 if (c->brief > 1) {
 275                         if (array.raid_disks)
 276                                 printf(" level=%s num-devices=%d",
 277                                        str?str:"-unknown-",
 278                                        array.raid_disks );
 279                         else
 280                                 printf(" level=container num-devices=%d",
 281                                        array.nr_disks);
 282                 }
 283                 if (container) {
 284                         printf(" container=%s", container);
 285                         printf(" member=%s", member);
 286                 } else {
 287                         if (sra && sra->array.major_version < 0)
 288                                 printf(" metadata=%s", sra->text_version);
 289                         else
 290                                 printf(" metadata=%d.%d",
 291                                        array.major_version, array.minor_version);
 292                 }
 293
 294                 /* Only try GET_BITMAP_FILE for 0.90.01 and later */
 295                 if (vers >= 9001 &&
 296                     ioctl(fd, GET_BITMAP_FILE, &bmf) == 0 &&
 297                     bmf.pathname[0]) {
 298                         printf(" bitmap=%s", bmf.pathname);
 299                 }
 300         } else {
 301                 mdu_bitmap_file_t bmf;
 302                 unsigned long long larray_size;
 303                 struct mdstat_ent *ms = mdstat_read(0, 0);
 304                 struct mdstat_ent *e;
 305                 int devnum = array.md_minor;
 306                 if (major(stb.st_rdev) == (unsigned)get_mdp_major())
 307                         devnum = -1 - devnum;
 308
 309                 for (e=ms; e; e=e->next)
 310                         if (e->devnum == devnum)
 311                                 break;
 312                 if (!get_dev_size(fd, NULL, &larray_size))
 313                         larray_size = 0;
 314
 315                 printf("%s:\n", dev);
 316
 317                 if (container)
 318                         printf("      Container : %s, member %s\n", container, member);
 319                 else {
 320                 if (sra && sra->array.major_version < 0)
 321                         printf("        Version : %s\n", sra->text_version);
 322                 else
 323                         printf("        Version : %d.%d\n",
 324                                array.major_version, array.minor_version);
 325                 }
 326
 327                 atime = array.ctime;
 328                 if (atime)
 329                         printf("  Creation Time : %.24s\n", ctime(&atime));
 330                 if (array.raid_disks == 0)
 331                         str = "container";
 332                 printf("     Raid Level : %s\n", str?str:"-unknown-");
 333                 if (larray_size)
 334                         printf("     Array Size : %llu%s\n", (larray_size>>10),
 335                                human_size(larray_size));
 336                 if (array.level >= 1) {
 337                         if (array.major_version != 0 &&
 338                             (larray_size >= 0xFFFFFFFFULL|| array.size == 0)) {
 339                                 unsigned long long dsize = get_component_size(fd);
 340                                 if (dsize > 0)
 341                                         printf("  Used Dev Size : %llu%s\n",
 342                                                dsize/2,
 343                                          human_size((long long)dsize<<9));
 344                                 else
 345                                         printf("  Used Dev Size : unknown\n");
 346                         } else
 347                                 printf("  Used Dev Size : %d%s\n", array.size,
 348                                        human_size((long long)array.size<<10));
 349                 }
 350                 if (array.raid_disks)
 351                         printf("   Raid Devices : %d\n", array.raid_disks);
 352                 printf("  Total Devices : %d\n", array.nr_disks);
 353                 if (!container &&
 354                     ((sra == NULL && array.major_version == 0) ||
 355                      (sra && sra->array.major_version == 0)))
 356                         printf("Preferred Minor : %d\n", array.md_minor);
 357                 if (sra == NULL || sra->array.major_version >= 0)
 358                         printf("    Persistence : Superblock is %spersistent\n",
 359                                array.not_persistent?"not ":"");
 360                 printf("\n");
 361                 /* Only try GET_BITMAP_FILE for 0.90.01 and later */
 362                 if (vers >= 9001 &&
 363                     ioctl(fd, GET_BITMAP_FILE, &bmf) == 0 &&
 364                     bmf.pathname[0]) {
 365                         printf("  Intent Bitmap : %s\n", bmf.pathname);
 366                         printf("\n");
 367                 } else if (array.state & (1<<MD_SB_BITMAP_PRESENT))
 368                         printf("  Intent Bitmap : Internal\n\n");
 369                 atime = array.utime;
 370                 if (atime)
 371                         printf("    Update Time : %.24s\n", ctime(&atime));
 372                 if (array.raid_disks) {
 373                         static char *sync_action[] = {
 374                                 ", recovering",  ", resyncing",
 375                                 ", reshaping",   ", checking"  };
 376                         char *st;
 377                         if (avail_disks == array.raid_disks)
 378                                 st = "";
 379                         else if (!enough(array.level, array.raid_disks,
 380                                          array.layout, 1, avail))
 381                                 st = ", FAILED";
 382                         else
 383                                 st = ", degraded";
 384
 385                         printf("          State : %s%s%s%s%s%s \n",
 386                                (array.state&(1<<MD_SB_CLEAN))?"clean":"active", st,
 387                                (!e || (e->percent < 0 && e->percent != RESYNC_PENDING &&
 388                                e->percent != RESYNC_DELAYED)) ? "" : sync_action[e->resync],
 389                                larray_size ? "": ", Not Started",
 390                                e->percent == RESYNC_DELAYED ? " (DELAYED)": "",
 391                                e->percent == RESYNC_PENDING ? " (PENDING)": "");
 392                 }
 393                 if (array.raid_disks)
 394                         printf(" Active Devices : %d\n", array.active_disks);
 395                 printf("Working Devices : %d\n", array.working_disks);
 396                 if (array.raid_disks) {
 397                         printf(" Failed Devices : %d\n", array.failed_disks);
 398                         printf("  Spare Devices : %d\n", array.spare_disks);
 399                 }
 400                 printf("\n");
 401                 if (array.level == 5) {
 402                         str = map_num(r5layout, array.layout);
 403                         printf("         Layout : %s\n", str?str:"-unknown-");
 404                 }
 405                 if (array.level == 6) {
 406                         str = map_num(r6layout, array.layout);
 407                         printf("         Layout : %s\n", str?str:"-unknown-");
 408                 }
 409                 if (array.level == 10) {
 410                         printf("         Layout :");
 411                         print_r10_layout(array.layout);
 412                         printf("\n");
 413                 }
 414                 switch (array.level) {
 415                 case 0:
 416                 case 4:
 417                 case 5:
 418                 case 10:
 419                 case 6:
 420                         if (array.chunk_size)
 421                                 printf("     Chunk Size : %dK\n\n",
 422                                        array.chunk_size/1024);
 423                         break;
 424                 case -1:
 425                         printf("       Rounding : %dK\n\n", array.chunk_size/1024);
 426                         break;
 427                 default: break;
 428                 }
 429
 430                 if (e && e->percent >= 0) {
 431                         static char *sync_action[] = {
 432                                 "Rebuild", "Resync",
 433                                 "Reshape", "Check"};
 434                         printf(" %7s Status : %d%% complete\n", sync_action[e->resync], e->percent);
 435                         is_rebuilding = 1;
 436                 }
 437                 free_mdstat(ms);
 438
 439                 if ((st && st->sb) && (info && info->reshape_active)) {
 440 #if 0
 441 This is pretty boring
 442                         printf("  Reshape pos'n : %llu%s\n", (unsigned long long) info->reshape_progress<<9,
 443                                human_size((unsigned long long)info->reshape_progress<<9));
 444 #endif
 445                         if (info->delta_disks != 0)
 446                                 printf("  Delta Devices : %d, (%d->%d)\n",
 447                                        info->delta_disks,
 448                                        array.raid_disks - info->delta_disks,
 449                                        array.raid_disks);
 450                         if (info->new_level != array.level) {
 451                                 str = map_num(pers, info->new_level);
 452                                 printf("      New Level : %s\n", str?str:"-unknown-");
 453                         }
 454                         if (info->new_level != array.level ||
 455                             info->new_layout != array.layout) {
 456                                 if (info->new_level == 5) {
 457                                         str = map_num(r5layout, info->new_layout);
 458                                         printf("     New Layout : %s\n",
 459                                                str?str:"-unknown-");
 460                                 }
 461                                 if (info->new_level == 6) {
 462                                         str = map_num(r6layout, info->new_layout);
 463                                         printf("     New Layout : %s\n",
 464                                                str?str:"-unknown-");
 465                                 }
 466                                 if (info->new_level == 10) {
 467                                         printf("     New Layout : near=%d, %s=%d\n",
 468                                                info->new_layout&255,
 469                                                (info->new_layout&0x10000)?"offset":"far",
 470                                                (info->new_layout>>8)&255);
 471                                 }
 472                         }
 473                         if (info->new_chunk != array.chunk_size)
 474                                 printf("  New Chunksize : %dK\n", info->new_chunk/1024);
 475                         printf("\n");
 476                 } else if (e && e->percent >= 0)
 477                         printf("\n");
 478                 if (st && st->sb)
 479                         st->ss->detail_super(st, c->homehost);
 480
 481                 if (array.raid_disks == 0 && sra && sra->array.major_version == -1
 482                     && sra->array.minor_version == -2 && sra->text_version[0] != '/') {
 483                         /* This looks like a container.  Find any active arrays
 484                          * That claim to be a member.
 485                          */
 486                         DIR *dir = opendir("/sys/block");
 487                         struct dirent *de;
 488
 489                         printf("  Member Arrays :");
 490
 491                         while (dir && (de = readdir(dir)) != NULL) {
 492                                 char path[200];
 493                                 char vbuf[1024];
 494                                 int nlen = strlen(sra->sys_name);
 495                                 int dn;
 496                                 if (de->d_name[0] == '.')
 497                                         continue;
 498                                 sprintf(path, "/sys/block/%s/md/metadata_version",
 499                                         de->d_name);
 500                                 if (load_sys(path, vbuf) < 0)
 501                                         continue;
 502                                 if (strncmp(vbuf, "external:", 9) != 0 ||
 503                                     !is_subarray(vbuf+9) ||
 504                                     strncmp(vbuf+10, sra->sys_name, nlen) != 0 ||
 505                                     vbuf[10+nlen] != '/')
 506                                         continue;
 507                                 dn = devname2devnum(de->d_name);
 508                                 printf(" %s", map_dev_preferred(
 509                                                dev2major(dn),
 510                                                dev2minor(dn), 1, c->prefer));
 511                         }
 512                         if (dir)
 513                                 closedir(dir);
 514                         printf("\n\n");
 515                 }
 516
 517                 if (array.raid_disks)
 518                         printf("    Number   Major   Minor   RaidDevice State\n");
 519                 else
 520                         printf("    Number   Major   Minor   RaidDevice\n");
 521         }
 522         free(info);
 523
 524         for (d= 0; d < max_disks; d++) {
 525                 char *dv;
 526                 mdu_disk_info_t disk = disks[d];
 527
 528                 if (d >= array.raid_disks &&
 529                     disk.major == 0 &&
 530                     disk.minor == 0)
 531                         continue;
 532                 if (!c->brief) {
 533                         if (d == array.raid_disks) printf("\n");
 534                         if (disk.raid_disk < 0)
 535                                 printf("   %5d   %5d    %5d        -     ",
 536                                        disk.number, disk.major, disk.minor);
 537                         else
 538                                 printf("   %5d   %5d    %5d    %5d     ",
 539                                        disk.number, disk.major, disk.minor, disk.raid_disk);
 540                 }
 541                 if (!c->brief && array.raid_disks) {
 542
 543                         if (disk.state & (1<<MD_DISK_FAULTY)) {
 544                                 printf(" faulty");
 545                                 if (disk.raid_disk < array.raid_disks &&
 546                                     disk.raid_disk >= 0)
 547                                         failed++;
 548                         }
 549                         if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
 550                         if (disk.state & (1<<MD_DISK_SYNC)) {
 551                                 printf(" sync");
 552                                 if (array.level == 10 && (array.layout & ~0x1FFFF) == 0) {
 553                                         int nc = array.layout & 0xff;
 554                                         int fc = (array.layout >> 8) & 0xff;
 555                                         int copies = nc*fc;
 556                                         if (fc == 1 && array.raid_disks % copies == 0 && copies <= 26) {
 557                                                 /* We can divide the devices into 'sets' */
 558                                                 int set = disk.raid_disk % copies;
 559                                                 printf(" set-%c", set + 'A');
 560                                         }
 561                                 }
 562                         }
 563                         if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
 564                         if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
 565                         if ((disk.state &
 566                              ((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)|(1<<MD_DISK_REMOVED)))
 567                             == 0) {
 568                                 printf(" spare");
 569                                 if (is_26) {
 570                                         if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
 571                                                 printf(" rebuilding");
 572                                 } else if (is_rebuilding && failed) {
 573                                         /* Taking a bit of a risk here, we remove the
 574                                          * device from the array, and then put it back.
 575                                          * If this fails, we are rebuilding
 576                                          */
 577                                         int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
 578                                         if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
 579                                         if (err && errno ==  EBUSY)
 580                                                 printf(" rebuilding");
 581                                 }
 582                         }
 583                 }
 584                 if (disk.state == 0) spares++;
 585                 if (c->test && d < array.raid_disks
 586                     && !(disk.state & (1<<MD_DISK_SYNC)))
 587                         rv |= 1;
 588                 dv=map_dev_preferred(disk.major, disk.minor, 0, c->prefer);
 589                 if (dv != NULL) {
 590                         if (c->brief) {
 591                                 if (devices) {
 592                                         devices = xrealloc(devices,
 593                                                           strlen(devices)+1+strlen(dv)+1);
 594                                         strcat(strcat(devices,","),dv);
 595                                 } else
 596                                         devices = xstrdup(dv);
 597                         } else
 598                                 printf("   %s", dv);
 599                 }
 600                 if (!c->brief) printf("\n");
 601         }
 602         if (spares && c->brief && array.raid_disks) printf(" spares=%d", spares);
 603         if (c->brief && st && st->sb)
 604                 st->ss->brief_detail_super(st);
 605         if (st)
 606                 st->ss->free_super(st);
 607
 608         if (c->brief > 1 && devices) printf("\n   devices=%s", devices);
 609         if (c->brief)
 610                 printf("\n");
 611         if (c->test &&
 612             !enough(array.level, array.raid_disks, array.layout,
 613                     1, avail))
 614                 rv = 2;
 615
 616         free(disks);
 617 out:
 618         close(fd);
 619         free(subarray);
 620         free(avail);
 621         sysfs_free(sra);
 622         return rv;
 623 }
 624
 625 int Detail_Platform(struct superswitch *ss, int scan, int verbose, int export, char *controller_path)
 626 {
 627         /* display platform capabilities for the given metadata format
 628          * 'scan' in this context means iterate over all metadata types
 629          */
 630         int i;
 631         int err = 1;
 632
 633         if (ss && export && ss->export_detail_platform)
 634                 err = ss->export_detail_platform(verbose, controller_path);
 635         else if (ss && ss->detail_platform)
 636                 err = ss->detail_platform(verbose, 0, controller_path);
 637         else if (ss) {
 638                 if (verbose > 0)
 639                         pr_err("%s metadata is platform independent\n",
 640                                 ss->name ? : "[no name]");
 641         } else if (!scan) {
 642                 if (verbose > 0)
 643                         pr_err("specify a metadata type or --scan\n");
 644         }
 645
 646         if (!scan)
 647                 return err;
 648
 649         err = 0;
 650         for (i = 0; superlist[i]; i++) {
 651                 struct superswitch *meta = superlist[i];
 652
 653                 if (meta == ss)
 654                         continue;
 655                 if (verbose > 0)
 656                         pr_err("checking metadata %s\n",
 657                                 meta->name ? : "[no name]");
 658                 if (!meta->detail_platform) {
 659                         if (verbose > 0)
 660                                 pr_err("%s metadata is platform independent\n",
 661                                         meta->name ? : "[no name]");
 662                 } else if (export && meta->export_detail_platform) {
 663                         err |= meta->export_detail_platform(verbose, controller_path);
 664                 } else
 665                         err |= meta->detail_platform(verbose, 0, controller_path);
 666         }
 667
 668         return err;
 669 }