util/raid.c

   1 /* raid.c - RAID support for GRUB utils.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* We only support RAID on Linux.  */
  21 #ifdef __linux__
  22 #include <grub/emu/misc.h>
  23 #include <grub/util/misc.h>
  24 #include <grub/util/raid.h>
  25 #include <grub/emu/getroot.h>
  26
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <sys/ioctl.h>
  30 #include <errno.h>
  31 #include <sys/types.h>
  32
  33 #include <linux/types.h>
  34 #include <linux/major.h>
  35 #include <linux/raid/md_p.h>
  36 #include <linux/raid/md_u.h>
  37
  38 char **
  39 grub_util_raid_getmembers (char *name)
  40 {
  41   int fd, ret, i, j;
  42   char *devname;
  43   char **devicelist;
  44   mdu_version_t version;
  45   mdu_array_info_t info;
  46   mdu_disk_info_t disk;
  47
  48   devname = xmalloc (strlen (name) + 6);
  49   strcpy (devname, "/dev/");
  50   strcpy (devname+5, name);
  51
  52   fd = open (devname, O_RDONLY);
  53
  54   if (fd == -1)
  55     grub_util_error ("can't open %s: %s", devname, strerror (errno));
  56
  57   free (devname);
  58
  59   ret = ioctl (fd, RAID_VERSION, &version);
  60   if (ret != 0)
  61     grub_util_error ("ioctl RAID_VERSION error: %s", strerror (errno));
  62
  63   if (version.major != 0 || version.minor != 90)
  64     grub_util_error ("unsupported RAID version: %d.%d",
  65                      version.major, version.minor);
  66
  67   ret = ioctl (fd, GET_ARRAY_INFO, &info);
  68   if (ret != 0)
  69     grub_util_error ("ioctl GET_ARRAY_INFO error: %s", strerror (errno));
  70
  71   devicelist = xmalloc ((info.nr_disks + 1) * sizeof (char *));
  72
  73   for (i = 0, j = 0; i <info.nr_disks; i++)
  74     {
  75       disk.number = i;
  76       ret = ioctl (fd, GET_DISK_INFO, &disk);
  77       if (ret != 0)
  78         grub_util_error ("ioctl GET_DISK_INFO error: %s", strerror (errno));
  79
  80       if (disk.state & (1 << MD_DISK_ACTIVE))
  81         {
  82           devicelist[j] = grub_find_device (NULL,
  83                                             makedev (disk.major, disk.minor));
  84           j++;
  85         }
  86     }
  87
  88   devicelist[j] = NULL;
  89
  90   return devicelist;
  91 }
  92
  93 #endif /* ! __linux__ */