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         struct mdinfo info;
  45         struct mddev_ident_s ident;
  46         mdu_array_info_t array;
  47         void *super;
  48         struct supertype *st = NULL;
  49
  50         unsigned long long larray_size;
  51         unsigned long array_size;
  52         struct stat stb;
  53         char *mddev;
  54         mdu_disk_info_t disc;
  55         char *activity;
  56
  57         if (fd < 0){
  58                 fprintf(stderr, Name ": cannot open %s: %s\n",
  59                         dev, strerror(errno));
  60                 return 1;
  61         }
  62
  63         vers = md_get_version(fd);
  64         if (ioctl(fd, GET_ARRAY_INFO, &array)<0)
  65                 ioctlerr = errno;
  66         else ioctlerr = 0;
  67
  68         fstat(fd, &stb);
  69
  70         if (vers>=9000 && !ioctlerr) {
  71 #ifdef BLKGETSIZE64
  72                 if (ioctl(fd, BLKGETSIZE64, &larray_size)==0)
  73                         ;
  74                 else
  75 #endif
  76                         if (ioctl(fd, BLKGETSIZE, &array_size)==0) {
  77                                 larray_size = array_size;
  78                                 larray_size <<= 9;
  79                         } else larray_size = 0;
  80         }
  81
  82         if (vers < 0)
  83                 printf("%s: is not an md array\n", dev);
  84         else if (vers < 9000)
  85                 printf("%s: is an md device, but kernel cannot provide details\n", dev);
  86         else if (ioctlerr == ENODEV)
  87                 printf("%s: is an md device which is not active\n", dev);
  88         else if (ioctlerr)
  89                 printf("%s: is an md device, but gives \"%s\" when queried\n",
  90                        dev, strerror(ioctlerr));
  91         else {
  92                 printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
  93                        dev,
  94                        human_size_brief(larray_size),
  95                        map_num(pers, array.level),
  96                        array.raid_disks,
  97                        array.spare_disks, array.spare_disks==1?"":"s");
  98         }
  99         st = guess_super(fd);
 100         if (st) {
 101                 superror = st->ss->load_super(st, fd, &super, dev);
 102                 superrno = errno;
 103         } else
 104                 superror = -1;
 105         close(fd);
 106         if (superror == 0) {
 107                 /* array might be active... */
 108                 st->ss->getinfo_super(&info, &ident, super);
 109                 if (st->ss->major == 0) {
 110                         mddev = get_md_name(info.array.md_minor);
 111                         disc.number = info.disk.number;
 112                         activity = "undetected";
 113                         if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
 114                                 if (md_get_version(fd) >= 9000 &&
 115                                     ioctl(fd, GET_ARRAY_INFO, &array)>= 0) {
 116                                         if (ioctl(fd, GET_DISK_INFO, &disc) >= 0 &&
 117                                             makedev((unsigned)disc.major,(unsigned)disc.minor) == stb.st_rdev)
 118                                                 activity = "active";
 119                                         else
 120                                                 activity = "mismatch";
 121                                 }
 122                                 close(fd);
 123                         }
 124                 } else {
 125                         activity = "unknown";
 126                         mddev = "array";
 127                 }
 128                 printf("%s: device %d in %d device %s %s %s.  Use mdadm --examine for more detail.\n",
 129                        dev,
 130                        info.disk.number, info.array.raid_disks,
 131                        activity,
 132                        map_num(pers, info.array.level),
 133                        mddev);
 134         }
 135         return 0;
 136 }
 137
 138