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     goto fail;
  53
  54   dev->disk = disk;
  55   dev->net = 0; /* FIXME */
  56
  57   return dev;
  58
  59  fail:
  60   if (disk)
  61     grub_disk_close (disk);
  62
  63   grub_free (dev);
  64
  65   return 0;
  66 }
  67
  68 grub_err_t
  69 grub_device_close (grub_device_t device)
  70 {
  71   if (device->disk)
  72     grub_disk_close (device->disk);
  73
  74   grub_free (device);
  75
  76   return grub_errno;
  77 }
  78
  79 int
  80 grub_device_iterate (int (*hook) (const char *name))
  81 {
  82   auto int iterate_disk (const char *disk_name);
  83   auto int iterate_partition (grub_disk_t disk,
  84                               const grub_partition_t partition);
  85
  86   struct part_ent
  87   {
  88     struct part_ent *next;
  89     char *name;
  90   } *ents = NULL;
  91
  92   int iterate_disk (const char *disk_name)
  93     {
  94       grub_device_t dev;
  95
  96       if (hook (disk_name))
  97         return 1;
  98
  99       dev = grub_device_open (disk_name);
 100       if (! dev)
 101         return 0;
 102
 103       if (dev->disk && dev->disk->has_partitions)
 104         {
 105           struct part_ent *p;
 106           int ret = 0;
 107
 108           (void) grub_partition_iterate (dev->disk, iterate_partition);
 109           grub_device_close (dev);
 110
 111           p = ents;
 112           ents = NULL;
 113           while (p != NULL)
 114             {
 115               struct part_ent *next = p->next;
 116
 117               if (!ret)
 118                 ret = hook (p->name);
 119               grub_free (p->name);
 120               grub_free (p);
 121               p = next;
 122             }
 123
 124           return ret;
 125         }
 126
 127       grub_device_close (dev);
 128       return 0;
 129     }
 130
 131   int iterate_partition (grub_disk_t disk, const grub_partition_t partition)
 132     {
 133       char *partition_name;
 134       struct part_ent *p;
 135
 136       partition_name = grub_partition_get_name (partition);
 137       if (! partition_name)
 138         return 1;
 139
 140       p = grub_malloc (sizeof (*p));
 141       if (!p)
 142         return 1;
 143
 144       p->name = grub_malloc (grub_strlen (disk->name) + 1
 145                              + grub_strlen (partition_name) + 1);
 146       if (! p->name)
 147         {
 148           grub_free (p);
 149           grub_free (partition_name);
 150           return 1;
 151         }
 152
 153       grub_sprintf (p->name, "%s,%s", disk->name, partition_name);
 154       grub_free (partition_name);
 155
 156       p->next = ents;
 157       ents = p;
 158
 159       return 0;
 160     }
 161
 162   /* Only disk devices are supported at the moment.  */
 163   return grub_disk_dev_iterate (iterate_disk);
 164 }