Query.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 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 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         mdp_super_t super;
  45         mdu_array_info_t array;
  46         unsigned long long larray_size;
  47         unsigned long array_size;
  48         struct stat stb;
  49         char *mddev;
  50         mdu_disk_info_t disc;
  51         char *activity;
  52
  53         if (fd < 0){
  54                 fprintf(stderr, Name ": cannot open %s: %s\n",
  55                         dev, strerror(errno));
  56                 return 1;
  57         }
  58
  59         vers = md_get_version(fd);
  60         if (ioctl(fd, GET_ARRAY_INFO, &array)<0)
  61                 ioctlerr = errno;
  62         else ioctlerr = 0;
  63         superror = load_super(fd, &super);
  64         superrno = errno;
  65
  66         fstat(fd, &stb);
  67
  68         if (vers>=9000 && !ioctlerr) {
  69 #ifdef BLKGETSIZE64
  70                 if (ioctl(fd, BLKGETSIZE64, &larray_size)==0)
  71                         ;
  72                 else
  73 #endif
  74                         if (ioctl(fd, BLKGETSIZE, &array_size)==0)
  75                                 larray_size = array_size<<9;
  76                         else larray_size = 0;
  77         }
  78         close(fd);
  79
  80         if (vers < 0)
  81                 printf("%s: is not an md array\n", dev);
  82         else if (vers < 9000)
  83                 printf("%s: is an md device, but kernel cannot provide details\n", dev);
  84         else if (ioctlerr == ENODEV)
  85                 printf("%s: is an md device which is not active\n", dev);
  86         else if (ioctlerr)
  87                 printf("%s: is an md device, but gives \"%s\" when queried\n",
  88                        dev, strerror(ioctlerr));
  89         else {
  90                 printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
  91                        dev,
  92                        human_size_brief(larray_size),
  93                        map_num(pers, array.level),
  94                        array.raid_disks,
  95                        array.spare_disks, array.spare_disks==1?"":"s");
  96         }
  97         switch(superror) {
  98         case 1:
  99                 printf("%s: cannot find device size: %s\n",
 100                        dev, strerror(superrno));
 101                 break;
 102         case 2:
 103                 printf("%s: is too small to be an md componenet.\n",
 104                        dev);
 105                 break;
 106         case 3:
 107                 printf("%s: Cannot seek to superblock: %s\n",
 108                        dev, strerror(superrno));
 109                 break;
 110         case 4:
 111                 printf("%s: Cannot read md superblock.\n",
 112                        dev);
 113                 break;
 114         case 5:
 115                 printf("%s: No md super block found, not an md component.\n",
 116                        dev);
 117                 break;
 118         case 6:
 119                 printf("%s: md superblock present with wrong version: %d\n",
 120                        dev, super.major_version);
 121                 break;
 122         default:
 123                 /* array might be active... */
 124                 mddev = get_md_name(super.md_minor);
 125                 disc.number = super.this_disk.number;
 126                 activity = "inactive";
 127                 if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
 128                         if (md_get_version(fd) >= 9000 &&
 129                             ioctl(fd, GET_ARRAY_INFO, &array)>= 0) {
 130                                 if (ioctl(fd, GET_DISK_INFO, &disc) >= 0 &&
 131                                     MKDEV(disc.major,disc.minor) == stb.st_rdev)
 132                                         activity = "active";
 133                                 else
 134                                         activity = "mismatch";
 135                         }
 136                         close(fd);
 137                 }
 138                 printf("%s: device %d in %d device %s %s md%d.  Use mdadm --examine for more detail.\n",
 139                        dev,
 140                        super.this_disk.number, super.raid_disks,
 141                        activity,
 142                        map_num(pers, super.level),
 143                        super.md_minor);
 144                 break;
 145         }
 146         return 0;
 147 }
 148
 149