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
  62         if (fd < 0) {
  63                 fprintf(stderr, Name ": cannot open %s: %s\n",
  64                         dev, strerror(errno));
  65                 return rv;
  66         }
  67         vers = md_get_version(fd);
  68         if (vers < 0) {
  69                 fprintf(stderr, Name ": %s does not appear to be an md device\n",
  70                         dev);
  71                 close(fd);
  72                 return rv;
  73         }
  74         if (vers < 9000) {
  75                 fprintf(stderr, Name ": cannot get detail for md device %s: driver version too old.\n",
  76                         dev);
  77                 close(fd);
  78                 return rv;
  79         }
  80         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
  81                 if (errno == ENODEV)
  82                         fprintf(stderr, Name ": md device %s does not appear to be active.\n",
  83                                 dev);
  84                 else
  85                         fprintf(stderr, Name ": cannot get array detail for %s: %s\n",
  86                                 dev, strerror(errno));
  87                 close(fd);
  88                 return rv;
  89         }
  90         st = super_by_version(array.major_version, array.minor_version);
  91
  92         if (fstat(fd, &stb) != 0 && !S_ISBLK(stb.st_mode))
  93                 stb.st_rdev = 0;
  94         rv = 0;
  95
  96         if (st) max_disks = st->max_devs;
  97
  98         /* try to load a superblock */
  99         for (d= 0; d<max_disks; d++) {
 100                 mdu_disk_info_t disk;
 101                 char *dv;
 102                 disk.number = d;
 103                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
 104                         continue;
 105                 if (d >= array.raid_disks &&
 106                     disk.major == 0 &&
 107                     disk.minor == 0)
 108                         continue;
 109                 if ((dv=map_dev(disk.major, disk.minor, 1))) {
 110                         if (!super && (disk.state & (1<<MD_DISK_ACTIVE))) {
 111                                 /* try to read the superblock from this device
 112                                  * to get more info
 113                                  */
 114                                 int fd2 = dev_open(dv, O_RDONLY);
 115                                 if (fd2 >=0 && st &&
 116                                     st->ss->load_super(st, fd2, &super, NULL) == 0) {
 117                                         st->ss->getinfo_super(&info, super);
 118                                         if (info.array.ctime != array.ctime ||
 119                                             info.array.level != array.level) {
 120                                                 free(super);
 121                                                 super = NULL;
 122                                         }
 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                 st->ss->export_super(super);
 139                 goto out;
 140         }
 141
 142         if (brief)
 143                 printf("ARRAY %s level=%s num-devices=%d", dev, c?c:"-unknown-",array.raid_disks );
 144         else {
 145                 mdu_bitmap_file_t bmf;
 146                 unsigned long long larray_size;
 147                 struct mdstat_ent *ms = mdstat_read(0, 0);
 148                 struct mdstat_ent *e;
 149                 int devnum = array.md_minor;
 150                 if (major(stb.st_rdev) != MD_MAJOR)
 151                         devnum = -1 - devnum;
 152
 153                 for (e=ms; e; e=e->next)
 154                         if (e->devnum == devnum)
 155                                 break;
 156                 if (!get_dev_size(fd, NULL, &larray_size))
 157                         larray_size = 0;
 158
 159                 printf("%s:\n", dev);
 160                 printf("        Version : %02d.%02d.%02d\n",
 161                        array.major_version, array.minor_version, array.patch_version);
 162                 atime = array.ctime;
 163                 printf("  Creation Time : %.24s\n", ctime(&atime));
 164                 printf("     Raid Level : %s\n", c?c:"-unknown-");
 165                 if (larray_size)
 166                         printf("     Array Size : %llu%s\n", (larray_size>>10), human_size(larray_size));
 167                 if (array.level >= 1) {
 168                         if (array.major_version != 0 &&
 169                             (larray_size >= 0xFFFFFFFFULL|| array.size == 0)) {
 170                                 unsigned long long dsize = get_component_size(fd);
 171                                 if (dsize > 0)
 172                                         printf("  Used Dev Size : %llu%s\n",
 173                                                dsize,
 174                                          human_size((long long)array.size<<10));
 175                                 else
 176                                         printf("  Used Dev Size : unknown\n");
 177                         } else
 178                                 printf("  Used Dev Size : %d%s\n", array.size,
 179                                        human_size((long long)array.size<<10));
 180                 }
 181                 printf("   Raid Devices : %d\n", array.raid_disks);
 182                 printf("  Total Devices : %d\n", array.nr_disks);
 183                 printf("Preferred Minor : %d\n", array.md_minor);
 184                 printf("    Persistence : Superblock is %spersistent\n",
 185                        array.not_persistent?"not ":"");
 186                 printf("\n");
 187                 /* Only try GET_BITMAP_FILE for 0.90.01 and later */
 188                 if (vers >= 9001 &&
 189                     ioctl(fd, GET_BITMAP_FILE, &bmf) == 0 &&
 190                     bmf.pathname[0]) {
 191                         printf("  Intent Bitmap : %s\n", bmf.pathname);
 192                         printf("\n");
 193                 } else if (array.state & (1<<MD_SB_BITMAP_PRESENT))
 194                         printf("  Intent Bitmap : Internal\n\n");
 195                 atime = array.utime;
 196                 printf("    Update Time : %.24s\n", ctime(&atime));
 197                 printf("          State : %s%s%s%s\n",
 198                        (array.state&(1<<MD_SB_CLEAN))?"clean":"active",
 199                        array.active_disks < array.raid_disks? ", degraded":"",
 200                        (!e || e->percent < 0) ? "" :
 201                         (e->resync) ? ", resyncing": ", recovering",
 202                        larray_size ? "": ", Not Started");
 203                 printf(" Active Devices : %d\n", array.active_disks);
 204                 printf("Working Devices : %d\n", array.working_disks);
 205                 printf(" Failed Devices : %d\n", array.failed_disks);
 206                 printf("  Spare Devices : %d\n", array.spare_disks);
 207                 printf("\n");
 208                 if (array.level == 5) {
 209                         c = map_num(r5layout, array.layout);
 210                         printf("         Layout : %s\n", c?c:"-unknown-");
 211                 }
 212                 if (array.level == 10) {
 213                         printf("         Layout : near=%d, %s=%d\n",
 214                                array.layout&255, (array.layout&0x10000)?"offset":"far",
 215                                (array.layout>>8)&255);
 216                 }
 217                 switch (array.level) {
 218                 case 0:
 219                 case 4:
 220                 case 5:
 221                 case 10:
 222                 case 6:
 223                         printf("     Chunk Size : %dK\n\n", array.chunk_size/1024);
 224                         break;
 225                 case -1:
 226                         printf("       Rounding : %dK\n\n", array.chunk_size/1024);
 227                         break;
 228                 default: break;
 229                 }
 230
 231                 if (e && e->percent >= 0) {
 232                         printf(" Re%s Status : %d%% complete\n",
 233                                (super && info.reshape_active)? "shape":"build",
 234                                e->percent);
 235                         is_rebuilding = 1;
 236                 }
 237                 free_mdstat(ms);
 238
 239                 if (super && info.reshape_active) {
 240 #if 0
 241 This is pretty boring
 242                         printf("  Reshape pos'n : %llu%s\n", (unsigned long long) info.reshape_progress<<9,
 243                                human_size(info.reshape_progress<<9));
 244 #endif
 245                         if (info.delta_disks > 0)
 246                                 printf("  Delta Devices : %d, (%d->%d)\n",
 247                                        info.delta_disks, array.raid_disks - info.delta_disks, array.raid_disks);
 248                         if (info.delta_disks < 0)
 249                                 printf("  Delta Devices : %d, (%d->%d)\n",
 250                                        info.delta_disks, array.raid_disks, array.raid_disks + info.delta_disks);
 251                         if (info.new_level != array.level) {
 252                                 char *c = map_num(pers, info.new_level);
 253                                 printf("      New Level : %s\n", c?c:"-unknown-");
 254                         }
 255                         if (info.new_level != array.level ||
 256                             info.new_layout != array.layout) {
 257                                 if (info.new_level == 5) {
 258                                         char *c = map_num(r5layout, info.new_layout);
 259                                         printf("     New Layout : %s\n",
 260                                                c?c:"-unknown-");
 261                                 }
 262                                 if (info.new_level == 10) {
 263                                         printf("     New Layout : near=%d, %s=%d\n",
 264                                                info.new_layout&255,
 265                                                (info.new_layout&0x10000)?"offset":"far",
 266                                                (info.new_layout>>8)&255);
 267                                 }
 268                         }
 269                         if (info.new_chunk != array.chunk_size)
 270                                 printf("  New Chunksize : %dK\n", info.new_chunk/1024);
 271                         printf("\n");
 272                 } else if (e && e->percent >= 0)
 273                         printf("\n");
 274                 if (super && st)
 275                         st->ss->detail_super(super, homehost);
 276
 277                 printf("    Number   Major   Minor   RaidDevice State\n");
 278         }
 279         disks = malloc(max_disks * sizeof(mdu_disk_info_t));
 280         for (d=0; d<max_disks; d++) {
 281                 disks[d].state = (1<<MD_DISK_REMOVED);
 282                 disks[d].major = disks[d].minor = 0;
 283                 disks[d].number = disks[d].raid_disk = d;
 284         }
 285
 286         next = array.raid_disks;
 287         for (d=0; d < max_disks; d++) {
 288                 mdu_disk_info_t disk;
 289                 disk.number = d;
 290                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
 291                         if (d < array.raid_disks)
 292                                 fprintf(stderr, Name ": cannot get device detail for device %d: %s\n",
 293                                         d, strerror(errno));
 294                         continue;
 295                 }
 296                 if (disk.major == 0 && disk.minor == 0)
 297                         continue;
 298                 if (disk.raid_disk >= 0 && disk.raid_disk < array.raid_disks)
 299                         disks[disk.raid_disk] = disk;
 300                 else if (next < max_disks)
 301                         disks[next++] = disk;
 302         }
 303
 304         for (d= 0; d < max_disks; d++) {
 305                 char *dv;
 306                 mdu_disk_info_t disk = disks[d];
 307
 308                 if (d >= array.raid_disks &&
 309                     disk.major == 0 &&
 310                     disk.minor == 0)
 311                         continue;
 312                 if (!brief) {
 313                         if (d == array.raid_disks) printf("\n");
 314                         if (disk.raid_disk < 0)
 315                                 printf("   %5d   %5d    %5d        -     ",
 316                                        disk.number, disk.major, disk.minor);
 317                         else
 318                                 printf("   %5d   %5d    %5d    %5d     ",
 319                                        disk.number, disk.major, disk.minor, disk.raid_disk);
 320                         if (disk.state & (1<<MD_DISK_FAULTY)) {
 321                                 printf(" faulty");
 322                                 if (disk.raid_disk < array.raid_disks &&
 323                                     disk.raid_disk >= 0)
 324                                         failed++;
 325                         }
 326                         if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
 327                         if (disk.state & (1<<MD_DISK_SYNC)) printf(" sync");
 328                         if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
 329                         if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
 330                         if ((disk.state &
 331                              ((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)|(1<<MD_DISK_REMOVED)))
 332                             == 0) {
 333                                 printf(" spare");
 334                                 if (is_26) {
 335                                         if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
 336                                                 printf(" rebuilding");
 337                                 } else if (is_rebuilding && failed) {
 338                                         /* Taking a bit of a risk here, we remove the
 339                                          * device from the array, and then put it back.
 340                                          * If this fails, we are rebuilding
 341                                          */
 342                                         int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
 343                                         if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
 344                                         if (err && errno ==  EBUSY)
 345                                                 printf(" rebuilding");
 346                                 }
 347                         }
 348                 }
 349                 if (disk.state == 0) spares++;
 350                 if (test && d < array.raid_disks && disk.state & (1<<MD_DISK_FAULTY)) {
 351                         if ((rv & 1) && (array.level ==4 || array.level == 5))
 352                                 rv |= 2;
 353                         rv |= 1;
 354                 }
 355                 if ((dv=map_dev(disk.major, disk.minor, 0))) {
 356                         if (brief) {
 357                                 if (devices) {
 358                                         devices = realloc(devices,
 359                                                           strlen(devices)+1+strlen(dv)+1);
 360                                         strcat(strcat(devices,","),dv);
 361                                 } else
 362                                         devices = strdup(dv);
 363                         } else
 364                                 printf("   %s", dv);
 365                 }
 366                 if (!brief) printf("\n");
 367         }
 368         if (spares && brief) printf(" spares=%d", spares);
 369         if (super && brief && st)
 370                 st->ss->brief_detail_super(super);
 371
 372         if (brief > 1 && devices) printf("\n   devices=%s", devices);
 373         if (brief) printf("\n");
 374 out:
 375         if (test && (rv&2)) rv &= ~1;
 376         close(fd);
 377         return rv;
 378 }