Detail.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_p.h"
  32 #include        "md_u.h"
  33
  34 int Detail(char *dev, int brief, int export, int test, char *homehost)
  35 {
  36         /*
  37          * Print out details for an md array by using
  38          * GET_ARRAY_INFO and GET_DISK_INFO ioctl calls
  39          */
  40
  41         int fd = open(dev, O_RDONLY, 0);
  42         int vers;
  43         mdu_array_info_t array;
  44         mdu_disk_info_t *disks;
  45         int next;
  46         int d;
  47         time_t atime;
  48         char *c;
  49         char *devices = NULL;
  50         int spares = 0;
  51         struct stat stb;
  52         int is_26 = get_linux_version() >= 2006000;
  53         int is_rebuilding = 0;
  54         int failed = 0;
  55         struct supertype *st = NULL;
  56         int max_disks = MD_SB_DISKS; /* just a default */
  57         struct mdinfo info;
  58
  59         int rv = test ? 4 : 1;
  60         int avail_disks = 0;
  61         char *avail;
  62
  63         if (fd < 0) {
  64                 fprintf(stderr, Name ": cannot open %s: %s\n",
  65                         dev, strerror(errno));
  66                 return rv;
  67         }
  68         vers = md_get_version(fd);
  69         if (vers < 0) {
  70                 fprintf(stderr, Name ": %s does not appear to be an md device\n",
  71                         dev);
  72                 close(fd);
  73                 return rv;
  74         }
  75         if (vers < 9000) {
  76                 fprintf(stderr, Name ": 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                         fprintf(stderr, Name ": md device %s does not appear to be active.\n",
  84                                 dev);
  85                 else
  86                         fprintf(stderr, Name ": cannot get array detail for %s: %s\n",
  87                                 dev, strerror(errno));
  88                 close(fd);
  89                 return rv;
  90         }
  91         st = super_by_version(array.major_version, array.minor_version);
  92
  93         if (fstat(fd, &stb) != 0 && !S_ISBLK(stb.st_mode))
  94                 stb.st_rdev = 0;
  95         rv = 0;
  96
  97         if (st) max_disks = st->max_devs;
  98
  99         /* try to load a superblock */
 100         for (d= 0; d<max_disks; d++) {
 101                 mdu_disk_info_t disk;
 102                 char *dv;
 103                 disk.number = d;
 104                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
 105                         continue;
 106                 if (d >= array.raid_disks &&
 107                     disk.major == 0 &&
 108                     disk.minor == 0)
 109                         continue;
 110                 if ((dv=map_dev(disk.major, disk.minor, 1))) {
 111                         if ((!st || !st->sb) &&
 112                             (disk.state & (1<<MD_DISK_ACTIVE))) {
 113                                 /* try to read the superblock from this device
 114                                  * to get more info
 115                                  */
 116                                 int fd2 = dev_open(dv, O_RDONLY);
 117                                 if (fd2 >=0 && st &&
 118                                     st->ss->load_super(st, fd2, NULL) == 0) {
 119                                         st->ss->getinfo_super(st, &info);
 120                                         if (info.array.ctime != array.ctime ||
 121                                             info.array.level != array.level)
 122                                                 st->ss->free_super(st);
 123                                 }
 124                                 if (fd2 >= 0) close(fd2);
 125                         }
 126                 }
 127         }
 128
 129         /* Ok, we have some info to print... */
 130         c = map_num(pers, array.level);
 131
 132         if (export) {
 133                 if (c)
 134                         printf("MD_LEVEL=%s\n", c);
 135                 printf("MD_DEVICES=%d\n", array.raid_disks);
 136                 printf("MD_METADATA=%d.%d\n", array.major_version,
 137                        array.minor_version);
 138                 if (st && st->sb)
 139                         st->ss->export_super(st);
 140                 goto out;
 141         }
 142
 143         if (brief)
 144                 printf("ARRAY %s level=%s metadata=%d.%d num-devices=%d", dev,
 145                        c?c:"-unknown-",
 146                        array.major_version, array.minor_version,
 147                        array.raid_disks );
 148         else {
 149                 mdu_bitmap_file_t bmf;
 150                 unsigned long long larray_size;
 151                 struct mdstat_ent *ms = mdstat_read(0, 0);
 152                 struct mdstat_ent *e;
 153                 int devnum = array.md_minor;
 154                 if (major(stb.st_rdev) != MD_MAJOR)
 155                         devnum = -1 - devnum;
 156
 157                 for (e=ms; e; e=e->next)
 158                         if (e->devnum == devnum)
 159                                 break;
 160                 if (!get_dev_size(fd, NULL, &larray_size))
 161                         larray_size = 0;
 162
 163                 printf("%s:\n", dev);
 164                 printf("        Version : %02d.%02d.%02d\n",
 165                        array.major_version, array.minor_version, array.patch_version);
 166                 atime = array.ctime;
 167                 printf("  Creation Time : %.24s\n", ctime(&atime));
 168                 printf("     Raid Level : %s\n", c?c:"-unknown-");
 169                 if (larray_size)
 170                         printf("     Array Size : %llu%s\n", (larray_size>>10), human_size(larray_size));
 171                 if (array.level >= 1) {
 172                         if (array.major_version != 0 &&
 173                             (larray_size >= 0xFFFFFFFFULL|| array.size == 0)) {
 174                                 unsigned long long dsize = get_component_size(fd);
 175                                 if (dsize > 0)
 176                                         printf("  Used Dev Size : %llu%s\n",
 177                                                dsize,
 178                                          human_size((long long)array.size<<10));
 179                                 else
 180                                         printf("  Used Dev Size : unknown\n");
 181                         } else
 182                                 printf("  Used Dev Size : %d%s\n", array.size,
 183                                        human_size((long long)array.size<<10));
 184                 }
 185                 printf("   Raid Devices : %d\n", array.raid_disks);
 186                 printf("  Total Devices : %d\n", array.nr_disks);
 187                 printf("Preferred Minor : %d\n", array.md_minor);
 188                 printf("    Persistence : Superblock is %spersistent\n",
 189                        array.not_persistent?"not ":"");
 190                 printf("\n");
 191                 /* Only try GET_BITMAP_FILE for 0.90.01 and later */
 192                 if (vers >= 9001 &&
 193                     ioctl(fd, GET_BITMAP_FILE, &bmf) == 0 &&
 194                     bmf.pathname[0]) {
 195                         printf("  Intent Bitmap : %s\n", bmf.pathname);
 196                         printf("\n");
 197                 } else if (array.state & (1<<MD_SB_BITMAP_PRESENT))
 198                         printf("  Intent Bitmap : Internal\n\n");
 199                 atime = array.utime;
 200                 printf("    Update Time : %.24s\n", ctime(&atime));
 201                 printf("          State : %s%s%s%s\n",
 202                        (array.state&(1<<MD_SB_CLEAN))?"clean":"active",
 203                        array.active_disks < array.raid_disks? ", degraded":"",
 204                        (!e || e->percent < 0) ? "" :
 205                         (e->resync) ? ", resyncing": ", recovering",
 206                        larray_size ? "": ", Not Started");
 207                 printf(" Active Devices : %d\n", array.active_disks);
 208                 printf("Working Devices : %d\n", array.working_disks);
 209                 printf(" Failed Devices : %d\n", array.failed_disks);
 210                 printf("  Spare Devices : %d\n", array.spare_disks);
 211                 printf("\n");
 212                 if (array.level == 5) {
 213                         c = map_num(r5layout, array.layout);
 214                         printf("         Layout : %s\n", c?c:"-unknown-");
 215                 }
 216                 if (array.level == 10) {
 217                         printf("         Layout : near=%d, %s=%d\n",
 218                                array.layout&255, (array.layout&0x10000)?"offset":"far",
 219                                (array.layout>>8)&255);
 220                 }
 221                 switch (array.level) {
 222                 case 0:
 223                 case 4:
 224                 case 5:
 225                 case 10:
 226                 case 6:
 227                         printf("     Chunk Size : %dK\n\n", array.chunk_size/1024);
 228                         break;
 229                 case -1:
 230                         printf("       Rounding : %dK\n\n", array.chunk_size/1024);
 231                         break;
 232                 default: break;
 233                 }
 234
 235                 if (e && e->percent >= 0) {
 236                         printf(" Re%s Status : %d%% complete\n",
 237                                (st && st->sb && info.reshape_active)?
 238                                   "shape":"build",
 239                                e->percent);
 240                         is_rebuilding = 1;
 241                 }
 242                 free_mdstat(ms);
 243
 244                 if (st->sb && info.reshape_active) {
 245 #if 0
 246 This is pretty boring
 247                         printf("  Reshape pos'n : %llu%s\n", (unsigned long long) info.reshape_progress<<9,
 248                                human_size(info.reshape_progress<<9));
 249 #endif
 250                         if (info.delta_disks > 0)
 251                                 printf("  Delta Devices : %d, (%d->%d)\n",
 252                                        info.delta_disks, array.raid_disks - info.delta_disks, array.raid_disks);
 253                         if (info.delta_disks < 0)
 254                                 printf("  Delta Devices : %d, (%d->%d)\n",
 255                                        info.delta_disks, array.raid_disks, array.raid_disks + info.delta_disks);
 256                         if (info.new_level != array.level) {
 257                                 char *c = map_num(pers, info.new_level);
 258                                 printf("      New Level : %s\n", c?c:"-unknown-");
 259                         }
 260                         if (info.new_level != array.level ||
 261                             info.new_layout != array.layout) {
 262                                 if (info.new_level == 5) {
 263                                         char *c = map_num(r5layout, info.new_layout);
 264                                         printf("     New Layout : %s\n",
 265                                                c?c:"-unknown-");
 266                                 }
 267                                 if (info.new_level == 10) {
 268                                         printf("     New Layout : near=%d, %s=%d\n",
 269                                                info.new_layout&255,
 270                                                (info.new_layout&0x10000)?"offset":"far",
 271                                                (info.new_layout>>8)&255);
 272                                 }
 273                         }
 274                         if (info.new_chunk != array.chunk_size)
 275                                 printf("  New Chunksize : %dK\n", info.new_chunk/1024);
 276                         printf("\n");
 277                 } else if (e && e->percent >= 0)
 278                         printf("\n");
 279                 if (st && st->sb)
 280                         st->ss->detail_super(st, homehost);
 281
 282                 printf("    Number   Major   Minor   RaidDevice State\n");
 283         }
 284         disks = malloc(max_disks * sizeof(mdu_disk_info_t));
 285         for (d=0; d<max_disks; d++) {
 286                 disks[d].state = (1<<MD_DISK_REMOVED);
 287                 disks[d].major = disks[d].minor = 0;
 288                 disks[d].number = disks[d].raid_disk = d;
 289         }
 290
 291         next = array.raid_disks;
 292         for (d=0; d < max_disks; d++) {
 293                 mdu_disk_info_t disk;
 294                 disk.number = d;
 295                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
 296                         if (d < array.raid_disks)
 297                                 fprintf(stderr, Name ": cannot get device detail for device %d: %s\n",
 298                                         d, strerror(errno));
 299                         continue;
 300                 }
 301                 if (disk.major == 0 && disk.minor == 0)
 302                         continue;
 303                 if (disk.raid_disk >= 0 && disk.raid_disk < array.raid_disks)
 304                         disks[disk.raid_disk] = disk;
 305                 else if (next < max_disks)
 306                         disks[next++] = disk;
 307         }
 308
 309         avail = calloc(array.raid_disks, 1);
 310         for (d= 0; d < max_disks; d++) {
 311                 char *dv;
 312                 mdu_disk_info_t disk = disks[d];
 313
 314                 if (d >= array.raid_disks &&
 315                     disk.major == 0 &&
 316                     disk.minor == 0)
 317                         continue;
 318                 if (!brief) {
 319                         if (d == array.raid_disks) printf("\n");
 320                         if (disk.raid_disk < 0)
 321                                 printf("   %5d   %5d    %5d        -     ",
 322                                        disk.number, disk.major, disk.minor);
 323                         else
 324                                 printf("   %5d   %5d    %5d    %5d     ",
 325                                        disk.number, disk.major, disk.minor, disk.raid_disk);
 326                         if (disk.state & (1<<MD_DISK_FAULTY)) {
 327                                 printf(" faulty");
 328                                 if (disk.raid_disk < array.raid_disks &&
 329                                     disk.raid_disk >= 0)
 330                                         failed++;
 331                         }
 332                         if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
 333                         if (disk.state & (1<<MD_DISK_SYNC)) printf(" sync");
 334                         if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
 335                         if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
 336                         if ((disk.state &
 337                              ((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)|(1<<MD_DISK_REMOVED)))
 338                             == 0) {
 339                                 printf(" spare");
 340                                 if (is_26) {
 341                                         if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
 342                                                 printf(" rebuilding");
 343                                 } else if (is_rebuilding && failed) {
 344                                         /* Taking a bit of a risk here, we remove the
 345                                          * device from the array, and then put it back.
 346                                          * If this fails, we are rebuilding
 347                                          */
 348                                         int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
 349                                         if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
 350                                         if (err && errno ==  EBUSY)
 351                                                 printf(" rebuilding");
 352                                 }
 353                         }
 354                 }
 355                 if (disk.state == 0) spares++;
 356                 if (test && d < array.raid_disks
 357                     && !(disk.state & (1<<MD_DISK_SYNC)))
 358                         rv |= 1;
 359                 if (d < array.raid_disks
 360                     && (disk.state & (1<<MD_DISK_SYNC))) {
 361                         avail_disks ++;
 362                         avail[d] = 1;
 363                 }
 364                 if ((dv=map_dev(disk.major, disk.minor, 0))) {
 365                         if (brief) {
 366                                 if (devices) {
 367                                         devices = realloc(devices,
 368                                                           strlen(devices)+1+strlen(dv)+1);
 369                                         strcat(strcat(devices,","),dv);
 370                                 } else
 371                                         devices = strdup(dv);
 372                         } else
 373                                 printf("   %s", dv);
 374                 }
 375                 if (!brief) printf("\n");
 376         }
 377         if (spares && brief) printf(" spares=%d", spares);
 378         if (brief && st && st->sb)
 379                 st->ss->brief_detail_super(st);
 380         st->ss->free_super(st);
 381
 382         if (brief > 1 && devices) printf("\n   devices=%s", devices);
 383         if (brief) printf("\n");
 384         if (test &&
 385             !enough(array.level, array.raid_disks, array.layout,
 386                     1, avail, avail_disks))
 387                 rv = 2;
 388
 389 out:
 390         close(fd);
 391         return rv;
 392 }