kern/device.c

   1 /* device.c - device manager */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2005,2007,2008  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 #include <grub/device.h>
  21 #include <grub/disk.h>
  22 #include <grub/net.h>
  23 #include <grub/fs.h>
  24 #include <grub/mm.h>
  25 #include <grub/misc.h>
  26 #include <grub/env.h>
  27 #include <grub/partition.h>
  28
  29 grub_device_t
  30 grub_device_open (const char *name)
  31 {
  32   grub_disk_t disk = 0;
  33   grub_device_t dev = 0;
  34
  35   if (! name)
  36     {
  37       name = grub_env_get ("root");
  38       if (*name == '\0')
  39         {
  40           grub_error (GRUB_ERR_BAD_DEVICE, "no device is set");
  41           goto fail;
  42         }
  43     }
  44
  45   dev = grub_malloc (sizeof (*dev));
  46   if (! dev)
  47     goto fail;
  48
  49   /* Try to open a disk.  */
  50   disk = grub_disk_open (name);
  51   if (! disk)
  52     {
  53       grub_print_error ();
  54       grub_errno = GRUB_ERR_NONE;
  55       goto fail;
  56     }
  57
  58   dev->disk = disk;
  59   dev->net = 0; /* FIXME */
  60
  61   return dev;
  62
  63  fail:
  64   if (disk)
  65     grub_disk_close (disk);
  66
  67   grub_free (dev);
  68
  69   return 0;
  70 }
  71
  72 grub_err_t
  73 grub_device_close (grub_device_t device)
  74 {
  75   if (device->disk)
  76     grub_disk_close (device->disk);
  77
  78   grub_free (device);
  79
  80   return grub_errno;
  81 }
  82
  83 int
  84 grub_device_iterate (int (*hook) (const char *name))
  85 {
  86   auto int iterate_disk (const char *disk_name);
  87   auto int iterate_partition (grub_disk_t disk,
  88                               const grub_partition_t partition);
  89
  90   int iterate_disk (const char *disk_name)
  91     {
  92       grub_device_t dev;
  93
  94       if (hook (disk_name))
  95         return 1;
  96
  97       dev = grub_device_open (disk_name);
  98       if (! dev)
  99         return 0;
 100
 101       if (dev->disk && dev->disk->has_partitions)
 102         if (grub_partition_iterate (dev->disk, iterate_partition))
 103           {
 104             grub_device_close (dev);
 105             return 1;
 106           }
 107
 108       grub_device_close (dev);
 109       return 0;
 110     }
 111
 112   int iterate_partition (grub_disk_t disk, const grub_partition_t partition)
 113     {
 114       char *partition_name;
 115       char *device_name;
 116       int ret;
 117
 118       partition_name = grub_partition_get_name (partition);
 119       if (! partition_name)
 120         return 1;
 121
 122       device_name = grub_malloc (grub_strlen (disk->name) + 1
 123                                  + grub_strlen (partition_name) + 1);
 124       if (! device_name)
 125         {
 126           grub_free (partition_name);
 127           return 1;
 128         }
 129
 130       grub_sprintf (device_name, "%s,%s", disk->name, partition_name);
 131       grub_free (partition_name);
 132
 133       ret = hook (device_name);
 134       grub_free (device_name);
 135       return ret;
 136     }
 137
 138   /* Only disk devices are supported at the moment.  */
 139   return grub_disk_dev_iterate (iterate_disk);
 140 }