Detail.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   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 test)
  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;
  57
  58         void *super = NULL;
  59         int rv = test ? 4 : 1;
  60
  61         if (fd < 0) {
  62                 fprintf(stderr, Name ": cannot open %s: %s\n",
  63                         dev, strerror(errno));
  64                 return rv;
  65         }
  66         vers = md_get_version(fd);
  67         if (vers < 0) {
  68                 fprintf(stderr, Name ": %s does not appear to be an md device\n",
  69                         dev);
  70                 close(fd);
  71                 return rv;
  72         }
  73         if (vers < 9000) {
  74                 fprintf(stderr, Name ": cannot get detail for md device %s: driver version too old.\n",
  75                         dev);
  76                 close(fd);
  77                 return rv;
  78         }
  79         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
  80                 if (errno == ENODEV)
  81                         fprintf(stderr, Name ": md device %s does not appear to be active.\n",
  82                                 dev);
  83                 else
  84                         fprintf(stderr, Name ": cannot get array detail for %s: %s\n",
  85                                 dev, strerror(errno));
  86                 close(fd);
  87                 return rv;
  88         }
  89         st = super_by_version(array.major_version, array.minor_version);
  90
  91         if (fstat(fd, &stb) != 0 && !S_ISBLK(stb.st_mode))
  92                 stb.st_rdev = 0;
  93         rv = 0;
  94
  95         if (st) max_disks = st->max_devs;
  96
  97         /* try to load a superblock */
  98         for (d= 0; d<max_disks; d++) {
  99                 mdu_disk_info_t disk;
 100                 char *dv;
 101                 disk.number = d;
 102                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
 103                         continue;
 104                 if (d >= array.raid_disks &&
 105                     disk.major == 0 &&
 106                     disk.minor == 0)
 107                         continue;
 108                 if ((dv=map_dev(disk.major, disk.minor))) {
 109                         if (!super && (disk.state & (1<<MD_DISK_ACTIVE))) {
 110                                 /* try to read the superblock from this device
 111                                  * to get more info
 112                                  */
 113                                 int fd2 = open(dv, O_RDONLY);
 114                                 if (fd2 >=0 && st &&
 115                                     st->ss->load_super(st, fd2, &super, NULL) == 0) {
 116                                         struct mdinfo info;
 117                                         struct mddev_ident_s ident;
 118                                         st->ss->getinfo_super(&info, &ident, super);
 119                                         if (info.array.ctime != array.ctime ||
 120                                             info.array.level != array.level) {
 121                                                 free(super);
 122                                                 super = NULL;
 123                                         }
 124                                 }
 125                                 if (fd2 >= 0) close(fd2);
 126                         }
 127                 }
 128         }
 129
 130         /* Ok, we have some info to print... */
 131         c = map_num(pers, array.level);
 132         if (brief)
 133                 printf("ARRAY %s level=%s num-devices=%d", dev, c?c:"-unknown-",array.raid_disks );
 134         else {
 135                 unsigned long array_size;
 136                 unsigned long long larray_size;
 137                 struct mdstat_ent *ms = mdstat_read(0);
 138                 struct mdstat_ent *e;
 139                 int devnum = array.md_minor;
 140                 if (major(stb.st_rdev) != MD_MAJOR)
 141                         devnum = -1 - devnum;
 142
 143                 for (e=ms; e; e=e->next)
 144                         if (e->devnum == devnum)
 145                                 break;
 146 #ifdef BLKGETSIZE64
 147                 if (ioctl(fd, BLKGETSIZE64, &larray_size)==0)
 148                         ;
 149                 else
 150 #endif
 151                         if (ioctl(fd, BLKGETSIZE, &array_size)==0) {
 152                                 larray_size = array_size;
 153                                 larray_size <<= 9;
 154                         }
 155
 156                 else larray_size = 0;
 157
 158                 printf("%s:\n", dev);
 159                 printf("        Version : %02d.%02d.%02d\n",
 160                        array.major_version, array.minor_version, array.patch_version);
 161                 atime = array.ctime;
 162                 printf("  Creation Time : %.24s\n", ctime(&atime));
 163                 printf("     Raid Level : %s\n", c?c:"-unknown-");
 164                 if (larray_size)
 165                         printf("     Array Size : %llu%s\n", (larray_size>>10), human_size(larray_size));
 166                 if (array.level >= 1) {
 167                         if (array.major_version != 0 &&
 168                             larray_size >= 0xFFFFFFFFULL)
 169                                 printf("    Device Size : unknown\n");
 170                         else
 171                                 printf("    Device Size : %d%s\n", array.size, human_size((long long)array.size<<10));
 172                 }
 173                 printf("   Raid Devices : %d\n", array.raid_disks);
 174                 printf("  Total Devices : %d\n", array.nr_disks);
 175                 printf("Preferred Minor : %d\n", array.md_minor);
 176                 printf("    Persistence : Superblock is %spersistent\n",
 177                        array.not_persistent?"not ":"");
 178                 printf("\n");
 179                 atime = array.utime;
 180                 printf("    Update Time : %.24s\n", ctime(&atime));
 181                 printf("          State : %s%s%s\n",
 182                        (array.state&(1<<MD_SB_CLEAN))?"clean":"active",
 183                        array.active_disks < array.raid_disks? ", degraded":"",
 184                        (!e || e->percent < 0) ? "" :
 185                         (e->resync) ? ", resyncing": ", recovering");
 186                 printf(" Active Devices : %d\n", array.active_disks);
 187                 printf("Working Devices : %d\n", array.working_disks);
 188                 printf(" Failed Devices : %d\n", array.failed_disks);
 189                 printf("  Spare Devices : %d\n", array.spare_disks);
 190                 printf("\n");
 191                 if (array.level == 5) {
 192                         c = map_num(r5layout, array.layout);
 193                         printf("         Layout : %s\n", c?c:"-unknown-");
 194                 }
 195                 if (array.level == 10) {
 196                         printf("         Layout : near=%d, far=%d\n",
 197                                array.layout&255, (array.layout>>8)&255);
 198                 }
 199                 switch (array.level) {
 200                 case 0:
 201                 case 4:
 202                 case 5:
 203                 case 10:
 204                 case 6:
 205                         printf("     Chunk Size : %dK\n\n", array.chunk_size/1024);
 206                         break;
 207                 case -1:
 208                         printf("       Rounding : %dK\n\n", array.chunk_size/1024);
 209                         break;
 210                 default: break;
 211                 }
 212
 213                 if (e && e->percent >= 0) {
 214                         printf(" Rebuild Status : %d%% complete\n\n", e->percent);
 215                         is_rebuilding = 1;
 216                 }
 217                 free_mdstat(ms);
 218
 219                 if (super && st)
 220                         st->ss->detail_super(super);
 221
 222                 printf("    Number   Major   Minor   RaidDevice State\n");
 223         }
 224         disks = malloc(max_disks * sizeof(mdu_disk_info_t));
 225         for (d=0; d<max_disks; d++) {
 226                 disks[d].state = (1<<MD_DISK_REMOVED);
 227                 disks[d].major = disks[d].minor = 0;
 228         }
 229
 230         next = array.raid_disks;
 231         for (d=0; d < max_disks; d++) {
 232                 mdu_disk_info_t disk;
 233                 disk.number = d;
 234                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
 235                         if (d < array.raid_disks)
 236                                 fprintf(stderr, Name ": cannot get device detail for device %d: %s\n",
 237                                         d, strerror(errno));
 238                         continue;
 239                 }
 240                 if (disk.major == 0 && disk.minor == 0)
 241                         continue;
 242                 if (disk.raid_disk >= 0 && disk.raid_disk < array.raid_disks)
 243                         disks[disk.raid_disk] = disk;
 244                 else if (next < max_disks)
 245                         disks[next++] = disk;
 246         }
 247
 248         for (d= 0; d < max_disks; d++) {
 249                 char *dv;
 250                 mdu_disk_info_t disk = disks[d];
 251
 252                 if (d >= array.raid_disks &&
 253                     disk.major == 0 &&
 254                     disk.minor == 0)
 255                         continue;
 256                 if (!brief) {
 257                         if (d == array.raid_disks) printf("\n");
 258                         if (disk.raid_disk < 0)
 259                                 printf("   %5d   %5d    %5d        -     ",
 260                                        disk.number, disk.major, disk.minor);
 261                         else
 262                                 printf("   %5d   %5d    %5d    %5d     ",
 263                                        disk.number, disk.major, disk.minor, disk.raid_disk);
 264                         if (disk.state & (1<<MD_DISK_FAULTY)) {
 265                                 printf(" faulty");
 266                                 if (disk.raid_disk < array.raid_disks &&
 267                                     disk.raid_disk >= 0)
 268                                         failed++;
 269                         }
 270                         if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
 271                         if (disk.state & (1<<MD_DISK_SYNC)) printf(" sync");
 272                         if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
 273                         if (disk.state & (1<<MD_DISK_WRITEMOSTLY)) printf(" writemostly");
 274                         if ((disk.state &
 275                              ((1<<MD_DISK_ACTIVE)|(1<<MD_DISK_SYNC)|(1<<MD_DISK_REMOVED)))
 276                             == 0) {
 277                                 printf(" spare");
 278                                 if (is_26) {
 279                                         if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
 280                                                 printf(" rebuilding");
 281                                 } else if (is_rebuilding && failed) {
 282                                         /* Taking a bit of a risk here, we remove the
 283                                          * device from the array, and then put it back.
 284                                          * If this fails, we are rebuilding
 285                                          */
 286                                         int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
 287                                         if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
 288                                         if (err && errno ==  EBUSY)
 289                                                 printf(" rebuilding");
 290                                 }
 291                         }
 292                 }
 293                 if (disk.state == 0) spares++;
 294                 if (test && d < array.raid_disks && disk.state & (1<<MD_DISK_FAULTY)) {
 295                         if ((rv & 1) && (array.level ==4 || array.level == 5))
 296                                 rv |= 2;
 297                         rv |= 1;
 298                 }
 299                 if ((dv=map_dev(disk.major, disk.minor))) {
 300                         if (brief) {
 301                                 if (devices) {
 302                                         devices = realloc(devices,
 303                                                           strlen(devices)+1+strlen(dv)+1);
 304                                         strcat(strcat(devices,","),dv);
 305                                 } else
 306                                         devices = strdup(dv);
 307                         } else
 308                                 printf("   %s", dv);
 309                 }
 310                 if (!brief) printf("\n");
 311         }
 312         if (spares && brief) printf(" spares=%d", spares);
 313         if (super && brief && st)
 314                 st->ss->brief_detail_super(super);
 315
 316         if (brief > 1 && devices) printf("\n   devices=%s", devices);
 317         if (brief) printf("\n");
 318         if (test && (rv&2)) rv &= ~1;
 319         close(fd);
 320         return rv;
 321 }