kern/partition.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2004,2007  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/misc.h>
  20 #include <grub/partition.h>
  21 #include <grub/disk.h>
  22
  23 static grub_partition_map_t grub_partition_map_list;
  24
  25 void
  26 grub_partition_map_register (grub_partition_map_t partmap)
  27 {
  28   partmap->next = grub_partition_map_list;
  29   grub_partition_map_list = partmap;
  30 }
  31
  32 void
  33 grub_partition_map_unregister (grub_partition_map_t partmap)
  34 {
  35   grub_partition_map_t *p, q;
  36
  37   for (p = &grub_partition_map_list, q = *p; q; p = &(q->next), q = q->next)
  38     if (q == partmap)
  39       {
  40         *p = q->next;
  41         break;
  42       }
  43 }
  44
  45 int
  46 grub_partition_map_iterate (int (*hook) (const grub_partition_map_t partmap))
  47 {
  48   grub_partition_map_t p;
  49
  50   for (p = grub_partition_map_list; p; p = p->next)
  51     if (hook (p))
  52       return 1;
  53
  54   return 0;
  55 }
  56
  57 grub_partition_t
  58 grub_partition_probe (struct grub_disk *disk, const char *str)
  59 {
  60   grub_partition_t part = 0;
  61
  62   auto int part_map_probe (const grub_partition_map_t partmap);
  63
  64   int part_map_probe (const grub_partition_map_t partmap)
  65     {
  66       part = partmap->probe (disk, str);
  67       if (part)
  68         return 1;
  69
  70       if (grub_errno == GRUB_ERR_BAD_PART_TABLE)
  71         {
  72           /* Continue to next partition map type.  */
  73           grub_errno = GRUB_ERR_NONE;
  74           return 0;
  75         }
  76
  77       return 1;
  78     }
  79
  80   /* Use the first partition map type found.  */
  81   grub_partition_map_iterate (part_map_probe);
  82
  83   return part;
  84 }
  85
  86 int
  87 grub_partition_iterate (struct grub_disk *disk,
  88                         int (*hook) (grub_disk_t disk,
  89                                      const grub_partition_t partition))
  90 {
  91   grub_partition_map_t partmap = 0;
  92   int ret = 0;
  93
  94   auto int part_map_iterate (const grub_partition_map_t p);
  95   auto int part_map_iterate_hook (grub_disk_t d,
  96                                   const grub_partition_t partition);
  97
  98   int part_map_iterate_hook (grub_disk_t d __attribute__ ((unused)),
  99                              const grub_partition_t partition __attribute__ ((unused)))
 100     {
 101       return 1;
 102     }
 103
 104   int part_map_iterate (const grub_partition_map_t p)
 105     {
 106       grub_dprintf ("partition", "Detecting %s...\n", p->name);
 107       p->iterate (disk, part_map_iterate_hook);
 108
 109       if (grub_errno != GRUB_ERR_NONE)
 110         {
 111           /* Continue to next partition map type.  */
 112           grub_dprintf ("partition", "%s detection failed.\n", p->name);
 113           grub_errno = GRUB_ERR_NONE;
 114           return 0;
 115         }
 116
 117       grub_dprintf ("partition", "%s detection succeeded.\n", p->name);
 118       partmap = p;
 119       return 1;
 120     }
 121
 122   grub_partition_map_iterate (part_map_iterate);
 123   if (partmap)
 124     ret = partmap->iterate (disk, hook);
 125
 126   return ret;
 127 }
 128
 129 char *
 130 grub_partition_get_name (const grub_partition_t partition)
 131 {
 132   return partition->partmap->get_name (partition);
 133 }