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         int level, raid_disks, spare_disks;
  39         struct mdinfo info;
  40         struct mdinfo *sra;
  41         struct supertype *st = NULL;
  42         unsigned long long larray_size;
  43         struct stat stb;
  44         char *mddev;
  45         mdu_disk_info_t disc;
  46         char *activity;
  47
  48         fd = open(dev, O_RDONLY);
  49         if (fd < 0){
  50                 pr_err("cannot open %s: %s\n", dev, strerror(errno));
  51                 return 1;
  52         }
  53
  54         if (fstat(fd, &stb) < 0)
  55                 staterr = errno;
  56         else
  57                 staterr = 0;
  58
  59         ioctlerr = 0;
  60
  61         sra = sysfs_read(fd, dev, GET_DISKS | GET_LEVEL | GET_DEVS | GET_STATE);
  62         if (sra) {
  63                 level = sra->array.level;
  64                 raid_disks = sra->array.raid_disks;
  65                 spare_disks = sra->array.spare_disks;
  66         } else {
  67                 mdu_array_info_t array;
  68
  69                 if (md_get_array_info(fd, &array) < 0) {
  70                         ioctlerr = errno;
  71                 } else {
  72                         level = array.level;
  73                         raid_disks = array.raid_disks;
  74                         spare_disks = array.spare_disks;
  75                 }
  76         }
  77
  78         if (!ioctlerr && !staterr) {
  79                 if (!get_dev_size(fd, NULL, &larray_size))
  80                         larray_size = 0;
  81         }
  82
  83         if (ioctlerr == ENODEV)
  84                 printf("%s: is an md device which is not active\n", dev);
  85         else if (ioctlerr)
  86                 printf("%s: is an md device, but gives \"%s\" when queried\n",
  87                        dev, strerror(ioctlerr));
  88         else if (staterr)
  89                 printf("%s: is not a valid md device, returning %s\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, human_size_brief(larray_size,IEC),
  94                        map_num(pers, level), raid_disks,
  95                        spare_disks, spare_disks == 1 ? "" : "s");
  96         }
  97         st = guess_super(fd);
  98         if (st && st->ss->compare_super != NULL)
  99                 superror = st->ss->load_super(st, fd, dev);
 100         else
 101                 superror = -1;
 102         close(fd);
 103         if (superror == 0) {
 104                 /* array might be active... */
 105                 int uuid[4];
 106                 struct map_ent *me, *map = NULL;
 107                 st->ss->getinfo_super(st, &info, NULL);
 108                 st->ss->uuid_from_super(st, uuid);
 109                 me = map_by_uuid(&map, uuid);
 110                 if (me) {
 111                         mddev = me->path;
 112                         disc.number = info.disk.number;
 113                         activity = "undetected";
 114                         if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
 115                                 if (md_array_active(fd)) {
 116                                         if (md_get_disk_info(fd, &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 = "inactive";
 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                 if (st->ss == &super0)
 135                         put_md_name(mddev);
 136         }
 137         return 0;
 138 }