137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/* fs_uuid.c - Access disks by their filesystem UUID. */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2007,2008 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/disk.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/kernel.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/mm.h>
|
|
#include <grub/types.h>
|
|
|
|
#include <grub/fs.h>
|
|
|
|
static grub_device_t
|
|
search_fs_uuid (const char *key, unsigned long *count)
|
|
{
|
|
*count = 0;
|
|
grub_device_t ret = NULL;
|
|
|
|
auto int iterate_device (const char *name);
|
|
int iterate_device (const char *name)
|
|
{
|
|
grub_device_t dev;
|
|
|
|
dev = grub_device_open (name);
|
|
if (dev)
|
|
{
|
|
grub_fs_t fs;
|
|
|
|
fs = grub_fs_probe (dev);
|
|
if (fs && fs->uuid)
|
|
{
|
|
char *uuid;
|
|
|
|
(fs->uuid) (dev, &uuid);
|
|
if (grub_errno == GRUB_ERR_NONE && uuid)
|
|
{
|
|
(*count)++;
|
|
|
|
if (grub_strcmp (uuid, key) == 0)
|
|
{
|
|
ret = dev;
|
|
grub_free (uuid);
|
|
return 1;
|
|
}
|
|
grub_free (uuid);
|
|
}
|
|
}
|
|
|
|
grub_device_close (dev);
|
|
}
|
|
|
|
grub_errno = GRUB_ERR_NONE;
|
|
return 0;
|
|
}
|
|
|
|
grub_device_iterate (iterate_device);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_fs_uuid_open (const char *name, grub_disk_t disk)
|
|
{
|
|
grub_device_t dev;
|
|
|
|
if (grub_strncmp (name, "UUID=", sizeof ("UUID=")-1))
|
|
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a UUID virtual volume");
|
|
|
|
dev = search_fs_uuid (name + sizeof ("UUID=") - 1, &disk->id);
|
|
if (! dev)
|
|
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no matching UUID found");
|
|
|
|
disk->total_sectors = dev->disk->total_sectors;
|
|
disk->has_partitions = 0;
|
|
disk->partition = dev->disk->partition;
|
|
disk->data = dev->disk;
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static void
|
|
grub_fs_uuid_close (grub_disk_t disk __attribute((unused)))
|
|
{
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_fs_uuid_read (grub_disk_t disk, grub_disk_addr_t sector,
|
|
grub_size_t size, char *buf)
|
|
{
|
|
grub_disk_t parent = disk->data;
|
|
return parent->dev->read (parent, sector, size, buf);
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_fs_uuid_write (grub_disk_t disk, grub_disk_addr_t sector,
|
|
grub_size_t size, const char *buf)
|
|
{
|
|
grub_disk_t parent = disk->data;
|
|
return parent->dev->write (parent, sector, size, buf);
|
|
}
|
|
|
|
static struct grub_disk_dev grub_fs_uuid_dev =
|
|
{
|
|
.name = "fs_uuid",
|
|
.id = GRUB_DISK_DEVICE_UUID_ID,
|
|
.open = grub_fs_uuid_open,
|
|
.close = grub_fs_uuid_close,
|
|
.read = grub_fs_uuid_read,
|
|
.write = grub_fs_uuid_write,
|
|
.next = 0
|
|
};
|
|
|
|
GRUB_MOD_INIT(fs_uuid)
|
|
{
|
|
grub_disk_dev_register (&grub_fs_uuid_dev);
|
|
}
|
|
|
|
GRUB_MOD_FINI(fs_uuid)
|
|
{
|
|
grub_disk_dev_unregister (&grub_fs_uuid_dev);
|
|
}
|