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 = open(dev, O_RDONLY);
  36         int vers;
  37         int ioctlerr;
  38         int superror;
  39         struct mdinfo info;
  40         mdu_array_info_t array;
  41         struct supertype *st = NULL;
  42
  43         unsigned long long larray_size;
  44         struct stat stb;
  45         char *mddev;
  46         mdu_disk_info_t disc;
  47         char *activity;
  48
  49         if (fd < 0){
  50                 pr_err("cannot open %s: %s\n",
  51                         dev, strerror(errno));
  52                 return 1;
  53         }
  54
  55         vers = md_get_version(fd);
  56         if (ioctl(fd, GET_ARRAY_INFO, &array)<0)
  57                 ioctlerr = errno;
  58         else ioctlerr = 0;
  59
  60         fstat(fd, &stb);
  61
  62         if (vers>=9000 && !ioctlerr) {
  63                 if (!get_dev_size(fd, NULL, &larray_size))
  64                         larray_size = 0;
  65         }
  66
  67         if (vers < 0)
  68                 printf("%s: is not an md array\n", dev);
  69         else if (vers < 9000)
  70                 printf("%s: is an md device, but kernel cannot provide details\n", dev);
  71         else if (ioctlerr == ENODEV)
  72                 printf("%s: is an md device which is not active\n", dev);
  73         else if (ioctlerr)
  74                 printf("%s: is an md device, but gives \"%s\" when queried\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_version(fd) >= 9000 &&
 103                                     ioctl(fd, GET_ARRAY_INFO, &array)>= 0) {
 104                                         if (ioctl(fd, GET_DISK_INFO, &disc) >= 0 &&
 105                                             makedev((unsigned)disc.major,(unsigned)disc.minor) == stb.st_rdev)
 106                                                 activity = "active";
 107                                         else
 108                                                 activity = "mismatch";
 109                                 }
 110                                 close(fd);
 111                         }
 112                 } else {
 113                         activity = "inactive";
 114                         mddev = "array";
 115                 }
 116                 printf("%s: device %d in %d device %s %s %s.  Use mdadm --examine for more detail.\n",
 117                        dev,
 118                        info.disk.number, info.array.raid_disks,
 119                        activity,
 120                        map_num(pers, info.array.level),
 121                        mddev);
 122                 if (st->ss == &super0)
 123                         put_md_name(mddev);
 124         }
 125         return 0;
 126 }