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         struct mdinfo info;
  39         mdu_array_info_t array;
  40         struct supertype *st = NULL;
  41         unsigned long long larray_size;
  42         struct stat stb;
  43         char *mddev;
  44         mdu_disk_info_t disc;
  45         char *activity;
  46
  47         fd = open(dev, O_RDONLY);
  48         if (fd < 0){
  49                 pr_err("cannot open %s: %s\n", dev, strerror(errno));
  50                 return 1;
  51         }
  52
  53         if (md_get_array_info(fd, &array) < 0)
  54                 ioctlerr = errno;
  55         else
  56                 ioctlerr = 0;
  57
  58         if (fstat(fd, &stb) < 0)
  59                 staterr = errno;
  60         else
  61                 staterr = 0;
  62
  63         if (!ioctlerr && !staterr) {
  64                 if (!get_dev_size(fd, NULL, &larray_size))
  65                         larray_size = 0;
  66         }
  67
  68         if (ioctlerr == ENODEV)
  69                 printf("%s: is an md device which is not active\n", dev);
  70         else if (ioctlerr)
  71                 printf("%s: is an md device, but gives \"%s\" when queried\n",
  72                        dev, strerror(ioctlerr));
  73         else if (staterr)
  74                 printf("%s: is not a valid md device, returning %s\n",
  75                        dev, strerror(ioctlerr));
  76         else {
  77                 printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
  78                        dev,
  79                        human_size_brief(larray_size,IEC),
  80                        map_num(pers, array.level),
  81                        array.raid_disks,
  82                        array.spare_disks, array.spare_disks==1?"":"s");
  83         }
  84         st = guess_super(fd);
  85         if (st && st->ss->compare_super != NULL)
  86                 superror = st->ss->load_super(st, fd, dev);
  87         else
  88                 superror = -1;
  89         close(fd);
  90         if (superror == 0) {
  91                 /* array might be active... */
  92                 int uuid[4];
  93                 struct map_ent *me, *map = NULL;
  94                 st->ss->getinfo_super(st, &info, NULL);
  95                 st->ss->uuid_from_super(st, uuid);
  96                 me = map_by_uuid(&map, uuid);
  97                 if (me) {
  98                         mddev = me->path;
  99                         disc.number = info.disk.number;
 100                         activity = "undetected";
 101                         if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
 102                                 if (md_get_array_info(fd, &array) >= 0) {
 103                                         if (md_get_disk_info(fd, &disc) >= 0 &&
 104                                             makedev((unsigned)disc.major,(unsigned)disc.minor) == stb.st_rdev)
 105                                                 activity = "active";
 106                                         else
 107                                                 activity = "mismatch";
 108                                 }
 109                                 close(fd);
 110                         }
 111                 } else {
 112                         activity = "inactive";
 113                         mddev = "array";
 114                 }
 115                 printf("%s: device %d in %d device %s %s %s.  Use mdadm --examine for more detail.\n",
 116                        dev,
 117                        info.disk.number, info.array.raid_disks,
 118                        activity,
 119                        map_num(pers, info.array.level),
 120                        mddev);
 121                 if (st->ss == &super0)
 122                         put_md_name(mddev);
 123         }
 124         return 0;
 125 }