Query.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2002-2009 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@suse.de>
  23  */
  24
  25 #include        "mdadm.h"
  26 #include        "md_p.h"
  27 #include        "md_u.h"
  28
  29 int Query(char *dev)
  30 {
  31         /* Give a brief description of the device,
  32          * whether it is an md device and whether it has
  33          * a superblock
  34          */
  35         int fd;
  36         int ioctlerr, staterr;
  37         int superror;
  38         int level, raid_disks, spare_disks;
  39         struct mdinfo info;
  40         struct mdinfo *sra;
  41         mdu_array_info_t array;
  42         struct supertype *st = NULL;
  43         unsigned long long larray_size;
  44         struct stat stb;
  45         char *mddev;
  46         mdu_disk_info_t disc;
  47         char *activity;
  48
  49         fd = open(dev, O_RDONLY);
  50         if (fd < 0){
  51                 pr_err("cannot open %s: %s\n", dev, strerror(errno));
  52                 return 1;
  53         }
  54
  55         if (fstat(fd, &stb) < 0)
  56                 staterr = errno;
  57         else
  58                 staterr = 0;
  59
  60         ioctlerr = 0;
  61
  62         sra = sysfs_read(fd, dev, GET_DISKS | GET_LEVEL | GET_DEVS | GET_STATE);
  63         if (sra) {
  64                 level = sra->array.level;
  65                 raid_disks = sra->array.raid_disks;
  66                 spare_disks = sra->array.spare_disks;
  67         } else {
  68                 if (md_get_array_info(fd, &array) < 0) {
  69                         ioctlerr = errno;
  70                 } else {
  71                         level = array.level;
  72                         raid_disks = array.raid_disks;
  73                         spare_disks = array.spare_disks;
  74                 }
  75         }
  76
  77         if (!ioctlerr && !staterr) {
  78                 if (!get_dev_size(fd, NULL, &larray_size))
  79                         larray_size = 0;
  80         }
  81
  82         if (ioctlerr == ENODEV)
  83                 printf("%s: is an md device which is not active\n", dev);
  84         else if (ioctlerr)
  85                 printf("%s: is an md device, but gives \"%s\" when queried\n",
  86                        dev, strerror(ioctlerr));
  87         else if (staterr)
  88                 printf("%s: is not a valid md device, returning %s\n",
  89                        dev, strerror(ioctlerr));
  90         else {
  91                 printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
  92                        dev, human_size_brief(larray_size,IEC),
  93                        map_num(pers, level), raid_disks,
  94                        spare_disks, spare_disks == 1 ? "" : "s");
  95         }
  96         st = guess_super(fd);
  97         if (st && st->ss->compare_super != NULL)
  98                 superror = st->ss->load_super(st, fd, dev);
  99         else
 100                 superror = -1;
 101         close(fd);
 102         if (superror == 0) {
 103                 /* array might be active... */
 104                 int uuid[4];
 105                 struct map_ent *me, *map = NULL;
 106                 st->ss->getinfo_super(st, &info, NULL);
 107                 st->ss->uuid_from_super(st, uuid);
 108                 me = map_by_uuid(&map, uuid);
 109                 if (me) {
 110                         mddev = me->path;
 111                         disc.number = info.disk.number;
 112                         activity = "undetected";
 113                         if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
 114                                 if (md_get_array_info(fd, &array) >= 0) {
 115                                         if (md_get_disk_info(fd, &disc) >= 0 &&
 116                                             makedev((unsigned)disc.major,(unsigned)disc.minor) == stb.st_rdev)
 117                                                 activity = "active";
 118                                         else
 119                                                 activity = "mismatch";
 120                                 }
 121                                 close(fd);
 122                         }
 123                 } else {
 124                         activity = "inactive";
 125                         mddev = "array";
 126                 }
 127                 printf("%s: device %d in %d device %s %s %s.  Use mdadm --examine for more detail.\n",
 128                        dev,
 129                        info.disk.number, info.array.raid_disks,
 130                        activity,
 131                        map_num(pers, info.array.level),
 132                        mddev);
 133                 if (st->ss == &super0)
 134                         put_md_name(mddev);
 135         }
 136         return 0;
 137 }