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/util/misc.h>
  23 #include <grub/util/raid.h>
  24
  25 #include <string.h>
  26 #include <fcntl.h>
  27 #include <sys/ioctl.h>
  28 #include <errno.h>
  29
  30 #include <linux/types.h>
  31 #include <linux/major.h>
  32 #include <linux/raid/md_p.h>
  33 #include <linux/raid/md_u.h>
  34
  35 static char *
  36 grub_util_getdiskname (int major, int minor)
  37 {
  38   char *name = xmalloc (15);
  39
  40   if (major == LOOP_MAJOR)
  41     sprintf (name, "/dev/loop%d", minor);
  42   else if (major == IDE0_MAJOR)
  43     sprintf (name, "/dev/hd%c", 'a' + minor / 64);
  44   else if (major == IDE1_MAJOR)
  45     sprintf (name, "/dev/hd%c", 'c' + minor / 64);
  46   else if (major == IDE2_MAJOR)
  47     sprintf (name, "/dev/hd%c", 'e' + minor / 64);
  48   else if (major == IDE3_MAJOR)
  49     sprintf (name, "/dev/hd%c", 'g' + minor / 64);
  50   else if (major == SCSI_DISK0_MAJOR)
  51     sprintf (name, "/dev/sd%c", 'a' + minor / 16);
  52   else
  53     grub_util_error ("Unknown device number: %d, %d", major, minor);
  54
  55   return name;
  56 }
  57
  58 char **
  59 grub_util_raid_getmembers (char *name)
  60 {
  61   int fd, ret, i, j;
  62   char *devname;
  63   char **devicelist;
  64   mdu_version_t version;
  65   mdu_array_info_t info;
  66   mdu_disk_info_t disk;
  67
  68   devname = xmalloc (strlen (name) + 6);
  69   strcpy (devname, "/dev/");
  70   strcpy (devname+5, name);
  71
  72   fd = open (devname, O_RDONLY);
  73
  74   if (fd == -1)
  75     grub_util_error ("Can't open %s: %s", devname, strerror (errno));
  76
  77   free (devname);
  78
  79   ret = ioctl (fd, RAID_VERSION, &version);
  80   if (ret != 0)
  81     grub_util_error ("ioctl RAID_VERSION error: %s", strerror (errno));
  82
  83   if (version.major != 0 || version.minor != 90)
  84     grub_util_error ("Unsupported RAID version: %d.%d",
  85                      version.major, version.minor);
  86
  87   ret = ioctl (fd, GET_ARRAY_INFO, &info);
  88   if (ret != 0)
  89     grub_util_error ("ioctl GET_ARRAY_INFO error: %s", strerror (errno));
  90
  91   devicelist = xmalloc ((info.nr_disks + 1) * sizeof (char *));
  92
  93   for (i = 0, j = 0; i <info.nr_disks; i++)
  94     {
  95       disk.number = i;
  96       ret = ioctl (fd, GET_DISK_INFO, &disk);
  97       if (ret != 0)
  98         grub_util_error ("ioctl GET_DISK_INFO error: %s", strerror (errno));
  99
 100       if (disk.state & (1 << MD_DISK_ACTIVE))
 101         {
 102           devicelist[j] = grub_util_getdiskname (disk.major, disk.minor);
 103           j++;
 104         }
 105     }
 106
 107   devicelist[j] = NULL;
 108
 109   return devicelist;
 110 }
 111
 112 #endif /* ! __linux__ */