Query.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2002-2006 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@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 Query(char *dev)
  35 {
  36         /* Give a brief description of the device,
  37          * whether it is an md device and whether it has
  38          * a superblock
  39          */
  40         int fd = open(dev, O_RDONLY, 0);
  41         int vers;
  42         int ioctlerr;
  43         int superror, superrno;
  44         struct mdinfo info;
  45         mdu_array_info_t array;
  46         struct supertype *st = NULL;
  47
  48         unsigned long long larray_size;
  49         struct stat stb;
  50         char *mddev;
  51         mdu_disk_info_t disc;
  52         char *activity;
  53
  54         if (fd < 0){
  55                 fprintf(stderr, Name ": cannot open %s: %s\n",
  56                         dev, strerror(errno));
  57                 return 1;
  58         }
  59
  60         vers = md_get_version(fd);
  61         if (ioctl(fd, GET_ARRAY_INFO, &array)<0)
  62                 ioctlerr = errno;
  63         else ioctlerr = 0;
  64
  65         fstat(fd, &stb);
  66
  67         if (vers>=9000 && !ioctlerr) {
  68                 if (!get_dev_size(fd, NULL, &larray_size))
  69                         larray_size = 0;
  70         }
  71
  72         if (vers < 0)
  73                 printf("%s: is not an md array\n", dev);
  74         else if (vers < 9000)
  75                 printf("%s: is an md device, but kernel cannot provide details\n", dev);
  76         else if (ioctlerr == ENODEV)
  77                 printf("%s: is an md device which is not active\n", dev);
  78         else if (ioctlerr)
  79                 printf("%s: is an md device, but gives \"%s\" when queried\n",
  80                        dev, strerror(ioctlerr));
  81         else {
  82                 printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
  83                        dev,
  84                        human_size_brief(larray_size),
  85                        map_num(pers, array.level),
  86                        array.raid_disks,
  87                        array.spare_disks, array.spare_disks==1?"":"s");
  88         }
  89         st = guess_super(fd);
  90         if (st) {
  91                 superror = st->ss->load_super(st, fd, dev);
  92                 superrno = errno;
  93         } else
  94                 superror = -1;
  95         close(fd);
  96         if (superror == 0) {
  97                 /* array might be active... */
  98                 st->ss->getinfo_super(st, &info);
  99                 if (st->ss->major == 0) {
 100                         mddev = get_md_name(info.array.md_minor);
 101                         disc.number = info.disk.number;
 102                         activity = "undetected";
 103                         if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
 104                                 if (md_get_version(fd) >= 9000 &&
 105                                     ioctl(fd, GET_ARRAY_INFO, &array)>= 0) {
 106                                         if (ioctl(fd, GET_DISK_INFO, &disc) >= 0 &&
 107                                             makedev((unsigned)disc.major,(unsigned)disc.minor) == stb.st_rdev)
 108                                                 activity = "active";
 109                                         else
 110                                                 activity = "mismatch";
 111                                 }
 112                                 close(fd);
 113                         }
 114                 } else {
 115                         activity = "unknown";
 116                         mddev = "array";
 117                 }
 118                 printf("%s: device %d in %d device %s %s %s.  Use mdadm --examine for more detail.\n",
 119                        dev,
 120                        info.disk.number, info.array.raid_disks,
 121                        activity,
 122                        map_num(pers, info.array.level),
 123                        mddev);
 124                 if (st->ss->major == 0)
 125                         put_md_name(mddev);
 126         }
 127         return 0;
 128 }
 129