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         int d;
  45         time_t atime;
  46         char *c;
  47         char *devices = NULL;
  48         int spares = 0;
  49         struct stat stb;
  50         int is_26 = get_linux_version() >= 2006000;
  51         int is_rebuilding = 0;
  52         int failed = 0;
  53
  54         mdp_super_t super;
  55         int have_super = 0;
  56         int rv = test ? 4 : 1;
  57
  58         if (fd < 0) {
  59                 fprintf(stderr, Name ": cannot open %s: %s\n",
  60                         dev, strerror(errno));
  61                 return rv;
  62         }
  63         vers = md_get_version(fd);
  64         if (vers < 0) {
  65                 fprintf(stderr, Name ": %s does not appear to be an md device\n",
  66                         dev);
  67                 close(fd);
  68                 return rv;
  69         }
  70         if (vers < 9000) {
  71                 fprintf(stderr, Name ": cannot get detail for md device %s: driver version too old.\n",
  72                         dev);
  73                 close(fd);
  74                 return rv;
  75         }
  76         if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
  77                 if (errno == ENODEV)
  78                         fprintf(stderr, Name ": md device %s does not appear to be active.\n",
  79                                 dev);
  80                 else
  81                         fprintf(stderr, Name ": cannot get array detail for %s: %s\n",
  82                                 dev, strerror(errno));
  83                 close(fd);
  84                 return rv;
  85         }
  86         if (fstat(fd, &stb) != 0 && !S_ISBLK(stb.st_mode))
  87                 stb.st_rdev = 0;
  88         rv = 0;
  89
  90         /* try to load a superblock */
  91         for (d= 0; d<MD_SB_DISKS; d++) {
  92                 mdu_disk_info_t disk;
  93                 char *dv;
  94                 disk.number = d;
  95                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0)
  96                         continue;
  97                 if (d >= array.raid_disks &&
  98                     disk.major == 0 &&
  99                     disk.minor == 0)
 100                         continue;
 101                 if ((dv=map_dev(disk.major, disk.minor))) {
 102                         if (!have_super && (disk.state & (1<<MD_DISK_ACTIVE))) {
 103                                 /* try to read the superblock from this device
 104                                  * to get more info
 105                                  */
 106                                 int fd2 = open(dv, O_RDONLY);
 107                                 if (fd2 >=0 &&
 108                                     load_super(fd2, &super) ==0 &&
 109                                     (unsigned long)super.ctime == (unsigned long)array.ctime &&
 110                                     (unsigned int)super.level == (unsigned int)array.level)
 111                                         have_super = 1;
 112                                 if (fd2 >= 0) close(fd2);
 113                         }
 114                 }
 115         }
 116
 117         /* Ok, we have some info to print... */
 118         c = map_num(pers, array.level);
 119         if (brief)
 120                 printf("ARRAY %s level=%s num-devices=%d", dev, c?c:"-unknown-",array.raid_disks );
 121         else {
 122                 unsigned long array_size;
 123                 unsigned long long larray_size;
 124                 struct mdstat_ent *ms = mdstat_read(0);
 125                 struct mdstat_ent *e;
 126                 int devnum = array.md_minor;
 127                 if (major(stb.st_rdev) != MD_MAJOR)
 128                         devnum = -1 - devnum;
 129
 130                 for (e=ms; e; e=e->next)
 131                         if (e->devnum == devnum)
 132                                 break;
 133 #ifdef BLKGETSIZE64
 134                 if (ioctl(fd, BLKGETSIZE64, &larray_size)==0)
 135                         ;
 136                 else
 137 #endif
 138                         if (ioctl(fd, BLKGETSIZE, &array_size)==0) {
 139                                 larray_size = array_size;
 140                                 larray_size <<= 9;
 141                         }
 142
 143                 else larray_size = 0;
 144
 145                 printf("%s:\n", dev);
 146                 printf("        Version : %02d.%02d.%02d\n",
 147                        array.major_version, array.minor_version, array.patch_version);
 148                 atime = array.ctime;
 149                 printf("  Creation Time : %.24s\n", ctime(&atime));
 150                 printf("     Raid Level : %s\n", c?c:"-unknown-");
 151                 if (larray_size)
 152                         printf("     Array Size : %llu%s\n", (larray_size>>10), human_size(larray_size));
 153                 if (array.level >= 1)
 154                         printf("    Device Size : %d%s\n", array.size, human_size((long long)array.size<<10));
 155                 printf("   Raid Devices : %d\n", array.raid_disks);
 156                 printf("  Total Devices : %d\n", array.nr_disks);
 157                 printf("Preferred Minor : %d\n", array.md_minor);
 158                 printf("    Persistence : Superblock is %spersistent\n",
 159                        array.not_persistent?"not ":"");
 160                 printf("\n");
 161                 atime = array.utime;
 162                 printf("    Update Time : %.24s\n", ctime(&atime));
 163                 printf("          State : %s%s%s\n",
 164                        (array.state&(1<<MD_SB_CLEAN))?"clean":"active",
 165                        array.active_disks < array.raid_disks? ", degraded":"",
 166                        (!e || e->percent < 0) ? "" :
 167                         (e->resync) ? ", resyncing": ", recovering");
 168                 printf(" Active Devices : %d\n", array.active_disks);
 169                 printf("Working Devices : %d\n", array.working_disks);
 170                 printf(" Failed Devices : %d\n", array.failed_disks);
 171                 printf("  Spare Devices : %d\n", array.spare_disks);
 172                 printf("\n");
 173                 if (array.level == 5) {
 174                         c = map_num(r5layout, array.layout);
 175                         printf("         Layout : %s\n", c?c:"-unknown-");
 176                 }
 177                 if (array.level == 10) {
 178                         printf("         Layout : near=%d, far=%d\n",
 179                                array.layout&255, (array.layout>>8)&255);
 180                 }
 181                 switch (array.level) {
 182                 case 0:
 183                 case 4:
 184                 case 5:
 185                 case 10:
 186                 case 6:
 187                         printf("     Chunk Size : %dK\n\n", array.chunk_size/1024);
 188                         break;
 189                 case -1:
 190                         printf("       Rounding : %dK\n\n", array.chunk_size/1024);
 191                         break;
 192                 default: break;
 193                 }
 194
 195                 if (e && e->percent >= 0) {
 196                         printf(" Rebuild Status : %d%% complete\n\n", e->percent);
 197                         is_rebuilding = 1;
 198                 }
 199                 free_mdstat(ms);
 200
 201                 if (have_super) {
 202                         printf("           UUID : ");
 203                         if (super.minor_version >= 90)
 204                                 printf("%08x:%08x:%08x:%08x", super.set_uuid0, super.set_uuid1,
 205                                        super.set_uuid2, super.set_uuid3);
 206                         else
 207                                 printf("%08x", super.set_uuid0);
 208                         printf("\n         Events : %d.%d\n\n", super.events_hi, super.events_lo);
 209                 }
 210
 211                 printf("    Number   Major   Minor   RaidDevice State\n");
 212         }
 213         for (d= 0; d<MD_SB_DISKS; d++) {
 214                 mdu_disk_info_t disk;
 215                 char *dv;
 216                 disk.number = d;
 217                 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
 218                         if (d < array.raid_disks)
 219                                 fprintf(stderr, Name ": cannot get device detail for device %d: %s\n",
 220                                         d, strerror(errno));
 221                         continue;
 222                 }
 223                 if (d >= array.raid_disks &&
 224                     disk.major == 0 &&
 225                     disk.minor == 0)
 226                         continue;
 227                 if (!brief) {
 228                         if (disk.number == array.raid_disks) printf("\n");
 229                         if (disk.raid_disk < 0)
 230                                 printf("   %5d   %5d    %5d        -     ",
 231                                        disk.number, disk.major, disk.minor);
 232                         else
 233                                 printf("   %5d   %5d    %5d    %5d     ",
 234                                        disk.number, disk.major, disk.minor, disk.raid_disk);
 235                         if (disk.state & (1<<MD_DISK_FAULTY)) {
 236                                 printf(" faulty");
 237                                 if (disk.raid_disk < array.raid_disks &&
 238                                     disk.raid_disk >= 0)
 239                                         failed++;
 240                         }
 241                         if (disk.state & (1<<MD_DISK_ACTIVE)) printf(" active");
 242                         if (disk.state & (1<<MD_DISK_SYNC)) printf(" sync");
 243                         if (disk.state & (1<<MD_DISK_REMOVED)) printf(" removed");
 244                         if (disk.state == 0) printf(" spare");
 245                         if (disk.state == 0) {
 246                                 if (is_26) {
 247                                         if (disk.raid_disk < array.raid_disks && disk.raid_disk >= 0)
 248                                                 printf(" rebuilding");
 249                                 } else if (is_rebuilding && failed) {
 250                                         /* Taking a bit of a risk here, we remove the
 251                                          * device from the array, and then put it back.
 252                                          * If this fails, we are rebuilding
 253                                          */
 254                                         int err = ioctl(fd, HOT_REMOVE_DISK, makedev(disk.major, disk.minor));
 255                                         if (err == 0) ioctl(fd, HOT_ADD_DISK, makedev(disk.major, disk.minor));
 256                                         if (err && errno ==  EBUSY)
 257                                                 printf(" rebuilding");
 258                                 }
 259                         }
 260                 }
 261                 if (disk.state == 0) spares++;
 262                 if (test && d < array.raid_disks && disk.state & (1<<MD_DISK_FAULTY)) {
 263                         if ((rv & 1) && (array.level ==4 || array.level == 5))
 264                                 rv |= 2;
 265                         rv |= 1;
 266                 }
 267                 if ((dv=map_dev(disk.major, disk.minor))) {
 268                         if (brief) {
 269                                 if (devices) {
 270                                         devices = realloc(devices,
 271                                                           strlen(devices)+1+strlen(dv)+1);
 272                                         strcat(strcat(devices,","),dv);
 273                                 } else
 274                                         devices = strdup(dv);
 275                         } else
 276                                 printf("   %s", dv);
 277                 }
 278                 if (!brief) printf("\n");
 279         }
 280         if (spares && brief) printf(" spares=%d", spares);
 281         if (have_super && brief) {
 282                 printf(" UUID=");
 283                 if (super.minor_version >= 90)
 284                         printf("%08x:%08x:%08x:%08x", super.set_uuid0, super.set_uuid1,
 285                                super.set_uuid2, super.set_uuid3);
 286                 else
 287                         printf("%08x", super.set_uuid0);
 288         }
 289         if (brief && devices) printf("\n   devices=%s", devices);
 290         if (brief) printf("\n");
 291         if (test && (rv&2)) rv &= ~1;
 292         close(fd);
 293         return rv;
 294 }