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