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         void *super = NULL;
  60         int rv = test ? 4 : 1;
  61         int avail_disks = 0;
  62         char *avail;
  63
  64         if (fd < 0) {
  65                 fprintf(stderr, Name ": cannot open %s: %s\n",
  66                         dev, strerror(errno));
  67                 return rv;
  68         }
  69         vers = md_get_version(fd);
  70         if (vers < 0) {
  71                 fprintf(stderr, Name ": %s does not appear to be an md device\n",
  72                         dev);
  73                 close(fd);
  74                 return rv;
  75         }
  76         if (vers < 9000) {
  77                 fprintf(stderr, Name ": cannot get detail for md device %s: driver version too old.\n",
  78                         dev);
  79                 close(fd);
  80                 return rv;
  81         }
  82         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
  83                 if (errno == ENODEV)
  84                         fprintf(stderr, Name ": md device %s does not appear to be active.\n",
  85                                 dev);
  86                 else
  87                         fprintf(stderr, Name ": cannot get array detail for %s: %s\n",
  88                                 dev, strerror(errno));
  89                 close(fd);
  90                 return rv;
  91         }
  92         st = super_by_version(array.major_version, array.minor_version);
  93
  94         if (fstat(fd, &stb) != 0 && !S_ISBLK(stb.st_mode))
  95                 stb.st_rdev = 0;
  96         rv = 0;
  97
  98         if (st) max_disks = st->max_devs;
  99
 100         /* try to load a superblock */
 101         for (d= 0; d<max_disks; d++) {
 102                 mdu_disk_info_t disk;
 103                 char *dv;
 104                 disk.number = d;
 105                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
 106                         continue;
 107                 if (d >= array.raid_disks &&
 108                     disk.major == 0 &&
 109                     disk.minor == 0)
 110                         continue;
 111                 if ((dv=map_dev(disk.major, disk.minor, 1))) {
 112                         if (!super && (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, &super, NULL) == 0) {
 119                                         st->ss->getinfo_super(&info, super);
 120                                         if (info.array.ctime != array.ctime ||
 121                                             info.array.level != array.level) {
 122                                                 free(super);
 123                                                 super = NULL;
 124                                         }
 125                                 }
 126                                 if (fd2 >= 0) close(fd2);
 127                         }
 128                 }
 129         }
 130
 131         /* Ok, we have some info to print... */
 132         c = map_num(pers, array.level);
 133
 134         if (export) {
 135                 if (c)
 136                         printf("MD_LEVEL=%s\n", c);
 137                 printf("MD_DEVICES=%d\n", array.raid_disks);
 138                 printf("MD_METADATA=%d.%d\n", array.major_version,
 139                        array.minor_version);
 140                 st->ss->export_super(super);
 141                 goto out;
 142         }
 143
 144         if (brief)
 145                 printf("ARRAY %s level=%s num-devices=%d", dev, c?c:"-unknown-",array.raid_disks );
 146         else {
 147                 mdu_bitmap_file_t bmf;
 148                 unsigned long long larray_size;
 149                 struct mdstat_ent *ms = mdstat_read(0, 0);
 150                 struct mdstat_ent *e;
 151                 int devnum = array.md_minor;
 152                 if (major(stb.st_rdev) != MD_MAJOR)
 153                         devnum = -1 - devnum;
 154
 155                 for (e=ms; e; e=e->next)
 156                         if (e->devnum == devnum)
 157                                 break;
 158                 if (!get_dev_size(fd, NULL, &larray_size))
 159                         larray_size = 0;
 160
 161                 printf("%s:\n", dev);
 162                 printf("        Version : %02d.%02d.%02d\n",
 163                        array.major_version, array.minor_version, array.patch_version);
 164                 atime = array.ctime;
 165                 printf("  Creation Time : %.24s\n", ctime(&atime));
 166                 printf("     Raid Level : %s\n", c?c:"-unknown-");
 167                 if (larray_size)
 168                         printf("     Array Size : %llu%s\n", (larray_size>>10), human_size(larray_size));
 169                 if (array.level >= 1) {
 170                         if (array.major_version != 0 &&
 171                             (larray_size >= 0xFFFFFFFFULL|| array.size == 0)) {
 172                                 unsigned long long dsize = get_component_size(fd);
 173                                 if (dsize > 0)
 174                                         printf("  Used Dev Size : %llu%s\n",
 175                                                dsize,
 176                                          human_size((long long)array.size<<10));
 177                                 else
 178                                         printf("  Used Dev Size : unknown\n");
 179                         } else
 180                                 printf("  Used Dev Size : %d%s\n", array.size,
 181                                        human_size((long long)array.size<<10));
 182                 }
 183                 printf("   Raid Devices : %d\n", array.raid_disks);
 184                 printf("  Total Devices : %d\n", array.nr_disks);
 185                 printf("Preferred Minor : %d\n", array.md_minor);
 186                 printf("    Persistence : Superblock is %spersistent\n",
 187                        array.not_persistent?"not ":"");
 188                 printf("\n");
 189                 /* Only try GET_BITMAP_FILE for 0.90.01 and later */
 190                 if (vers >= 9001 &&
 191                     ioctl(fd, GET_BITMAP_FILE, &bmf) == 0 &&
 192                     bmf.pathname[0]) {
 193                         printf("  Intent Bitmap : %s\n", bmf.pathname);
 194                         printf("\n");
 195                 } else if (array.state & (1<<MD_SB_BITMAP_PRESENT))
 196                         printf("  Intent Bitmap : Internal\n\n");
 197                 atime = array.utime;
 198                 printf("    Update Time : %.24s\n", ctime(&atime));
 199                 printf("          State : %s%s%s%s\n",
 200                        (array.state&(1<<MD_SB_CLEAN))?"clean":"active",
 201                        array.active_disks < array.raid_disks? ", degraded":"",
 202                        (!e || e->percent < 0) ? "" :
 203                         (e->resync) ? ", resyncing": ", recovering",
 204                        larray_size ? "": ", Not Started");
 205                 printf(" Active Devices : %d\n", array.active_disks);
 206                 printf("Working Devices : %d\n", array.working_disks);
 207                 printf(" Failed Devices : %d\n", array.failed_disks);
 208                 printf("  Spare Devices : %d\n", array.spare_disks);
 209                 printf("\n");
 210                 if (array.level == 5) {
 211                         c = map_num(r5layout, array.layout);
 212                         printf("         Layout : %s\n", c?c:"-unknown-");
 213                 }
 214                 if (array.level == 10) {
 215                         printf("         Layout : near=%d, %s=%d\n",
 216                                array.layout&255, (array.layout&0x10000)?"offset":"far",
 217                                (array.layout>>8)&255);
 218                 }
 219                 switch (array.level) {
 220                 case 0:
 221                 case 4:
 222                 case 5:
 223                 case 10:
 224                 case 6:
 225                         printf("     Chunk Size : %dK\n\n", array.chunk_size/1024);
 226                         break;
 227                 case -1:
 228                         printf("       Rounding : %dK\n\n", array.chunk_size/1024);
 229                         break;
 230                 default: break;
 231                 }
 232
 233                 if (e && e->percent >= 0) {
 234                         printf(" Re%s Status : %d%% complete\n",
 235                                (super && info.reshape_active)? "shape":"build",
 236                                e->percent);
 237                         is_rebuilding = 1;
 238                 }
 239                 free_mdstat(ms);
 240
 241                 if (super && info.reshape_active) {
 242 #if 0
 243 This is pretty boring
 244                         printf("  Reshape pos'n : %llu%s\n", (unsigned long long) info.reshape_progress<<9,
 245                                human_size(info.reshape_progress<<9));
 246 #endif
 247                         if (info.delta_disks > 0)
 248                                 printf("  Delta Devices : %d, (%d->%d)\n",
 249                                        info.delta_disks, array.raid_disks - info.delta_disks, array.raid_disks);
 250                         if (info.delta_disks < 0)
 251                                 printf("  Delta Devices : %d, (%d->%d)\n",
 252                                        info.delta_disks, array.raid_disks, array.raid_disks + info.delta_disks);
 253                         if (info.new_level != array.level) {
 254                                 char *c = map_num(pers, info.new_level);
 255                                 printf("      New Level : %s\n", c?c:"-unknown-");
 256                         }
 257                         if (info.new_level != array.level ||
 258                             info.new_layout != array.layout) {
 259                                 if (info.new_level == 5) {
 260                                         char *c = map_num(r5layout, info.new_layout);
 261                                         printf("     New Layout : %s\n",
 262                                                c?c:"-unknown-");
 263                                 }
 264                                 if (info.new_level == 10) {
 265                                         printf("     New Layout : near=%d, %s=%d\n",
 266                                                info.new_layout&255,
 267                                                (info.new_layout&0x10000)?"offset":"far",
 268                                                (info.new_layout>>8)&255);
 269                                 }
 270                         }
 271                         if (info.new_chunk != array.chunk_size)
 272                                 printf("  New Chunksize : %dK\n", info.new_chunk/1024);
 273                         printf("\n");
 274                 } else if (e && e->percent >= 0)
 275                         printf("\n");
 276                 if (super && st)
 277                         st->ss->detail_super(super, homehost);
 278
 279                 printf("    Number   Major   Minor   RaidDevice State\n");
 280         }
 281         disks = malloc(max_disks * sizeof(mdu_disk_info_t));
 282         for (d=0; d<max_disks; d++) {
 283                 disks[d].state = (1<<MD_DISK_REMOVED);
 284                 disks[d].major = disks[d].minor = 0;
 285                 disks[d].number = disks[d].raid_disk = d;
 286         }
 287
 288         next = array.raid_disks;
 289         for (d=0; d < max_disks; d++) {
 290                 mdu_disk_info_t disk;
 291                 disk.number = d;
 292                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
 293                         if (d < array.raid_disks)
 294                                 fprintf(stderr, Name ": cannot get device detail for device %d: %s\n",
 295                                         d, strerror(errno));
 296                         continue;
 297                 }
 298                 if (disk.major == 0 && disk.minor == 0)
 299                         continue;
 300                 if (disk.raid_disk >= 0 && disk.raid_disk < array.raid_disks)
 301                         disks[disk.raid_disk] = disk;
 302                 else if (next < max_disks)
 303                         disks[next++] = disk;
 304         }
 305
 306         avail = calloc(array.raid_disks, 1);
 307         for (d= 0; d < max_disks; d++) {
 308                 char *dv;
 309                 mdu_disk_info_t disk = disks[d];
 310
 311                 if (d >= array.raid_disks &&
 312                     disk.major == 0 &&
 313                     disk.minor == 0)
 314                         continue;
 315                 if (!brief) {
 316                         if (d == array.raid_disks) printf("\n");
 317                         if (disk.raid_disk < 0)
 318                                 printf("   %5d   %5d    %5d        -     ",
 319                                        disk.number, disk.major, disk.minor);
 320                         else
 321                                 printf("   %5d   %5d    %5d    %5d     ",
 322                                        disk.number, disk.major, disk.minor, disk.raid_disk);
 323                         if (disk.state & (1<<MD_DISK_FAULTY)) {
 324                                 printf(" faulty");
 325                                 if (disk.raid_disk < array.raid_disks &&
 326                                     disk.raid_disk >= 0)
 327                                         failed++;
 328                         }
 329                         if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
 330                         if (disk.state & (1<<MD_DISK_SYNC)) printf(" sync");
 331                         if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
 332                         if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
 333                         if ((disk.state &
 334                              ((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)|(1<<MD_DISK_REMOVED)))
 335                             == 0) {
 336                                 printf(" spare");
 337                                 if (is_26) {
 338                                         if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
 339                                                 printf(" rebuilding");
 340                                 } else if (is_rebuilding && failed) {
 341                                         /* Taking a bit of a risk here, we remove the
 342                                          * device from the array, and then put it back.
 343                                          * If this fails, we are rebuilding
 344                                          */
 345                                         int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
 346                                         if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
 347                                         if (err && errno ==  EBUSY)
 348                                                 printf(" rebuilding");
 349                                 }
 350                         }
 351                 }
 352                 if (disk.state == 0) spares++;
 353                 if (test && d < array.raid_disks
 354                     && !(disk.state & (1<<MD_DISK_SYNC)))
 355                         rv |= 1;
 356                 if (d < array.raid_disks
 357                     && (disk.state & (1<<MD_DISK_SYNC))) {
 358                         avail_disks ++;
 359                         avail[d] = 1;
 360                 }
 361                 if ((dv=map_dev(disk.major, disk.minor, 0))) {
 362                         if (brief) {
 363                                 if (devices) {
 364                                         devices = realloc(devices,
 365                                                           strlen(devices)+1+strlen(dv)+1);
 366                                         strcat(strcat(devices,","),dv);
 367                                 } else
 368                                         devices = strdup(dv);
 369                         } else
 370                                 printf("   %s", dv);
 371                 }
 372                 if (!brief) printf("\n");
 373         }
 374         if (spares && brief) printf(" spares=%d", spares);
 375         if (super && brief && st)
 376                 st->ss->brief_detail_super(super);
 377
 378         if (brief > 1 && devices) printf("\n   devices=%s", devices);
 379         if (brief) printf("\n");
 380         if (test &&
 381             !enough(array.level, array.raid_disks, array.layout,
 382                     1, avail, avail_disks))
 383                 rv = 2;
 384
 385 out:
 386         close(fd);
 387         return rv;
 388 }