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
  26 #include <string.h>
  27 #include <fcntl.h>
  28 #include <sys/ioctl.h>
  29 #include <errno.h>
  30
  31 #include <linux/types.h>
  32 #include <linux/major.h>
  33 #include <linux/raid/md_p.h>
  34 #include <linux/raid/md_u.h>
  35
  36 static char *
  37 grub_util_getdiskname (int major, int minor)
  38 {
  39   char *name = xmalloc (15);
  40
  41   if (major == LOOP_MAJOR)
  42     sprintf (name, "/dev/loop%d", minor);
  43   else if (major == IDE0_MAJOR)
  44     sprintf (name, "/dev/hd%c", 'a' + minor / 64);
  45   else if (major == IDE1_MAJOR)
  46     sprintf (name, "/dev/hd%c", 'c' + minor / 64);
  47   else if (major == IDE2_MAJOR)
  48     sprintf (name, "/dev/hd%c", 'e' + minor / 64);
  49   else if (major == IDE3_MAJOR)
  50     sprintf (name, "/dev/hd%c", 'g' + minor / 64);
  51   else if (major == SCSI_DISK0_MAJOR)
  52     sprintf (name, "/dev/sd%c", 'a' + minor / 16);
  53   else
  54     grub_util_error ("unknown device number: %d, %d", major, minor);
  55
  56   return name;
  57 }
  58
  59 char **
  60 grub_util_raid_getmembers (char *name)
  61 {
  62   int fd, ret, i, j;
  63   char *devname;
  64   char **devicelist;
  65   mdu_version_t version;
  66   mdu_array_info_t info;
  67   mdu_disk_info_t disk;
  68
  69   devname = xmalloc (strlen (name) + 6);
  70   strcpy (devname, "/dev/");
  71   strcpy (devname+5, name);
  72
  73   fd = open (devname, O_RDONLY);
  74
  75   if (fd == -1)
  76     grub_util_error ("can't open %s: %s", devname, strerror (errno));
  77
  78   free (devname);
  79
  80   ret = ioctl (fd, RAID_VERSION, &version);
  81   if (ret != 0)
  82     grub_util_error ("ioctl RAID_VERSION error: %s", strerror (errno));
  83
  84   if (version.major != 0 || version.minor != 90)
  85     grub_util_error ("unsupported RAID version: %d.%d",
  86                      version.major, version.minor);
  87
  88   ret = ioctl (fd, GET_ARRAY_INFO, &info);
  89   if (ret != 0)
  90     grub_util_error ("ioctl GET_ARRAY_INFO error: %s", strerror (errno));
  91
  92   devicelist = xmalloc ((info.nr_disks + 1) * sizeof (char *));
  93
  94   for (i = 0, j = 0; i <info.nr_disks; i++)
  95     {
  96       disk.number = i;
  97       ret = ioctl (fd, GET_DISK_INFO, &disk);
  98       if (ret != 0)
  99         grub_util_error ("ioctl GET_DISK_INFO error: %s", strerror (errno));
 100
 101       if (disk.state & (1 << MD_DISK_ACTIVE))
 102         {
 103           devicelist[j] = grub_util_getdiskname (disk.major, disk.minor);
 104           j++;
 105         }
 106     }
 107
 108   devicelist[j] = NULL;
 109
 110   return devicelist;
 111 }
 112
 113 #endif /* ! __linux__ */