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2008-06-26 Robert Millan <rmh@aybabtu.com>

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* disk/fs_uuid.c: New file.
        * conf/common.rmk (pkglib_MODULES): Add `fs_uuid.mod'.
        (fs_uuid_mod_SOURCES, fs_uuid_mod_CFLAGS)
        (fs_uuid_mod_LDFLAGS): New variables.
        * include/grub/disk.h (grub_disk_dev_id): Add
        `GRUB_DISK_DEVICE_UUID_ID'.
        * kern/disk.c (grub_disk_dev_iterate): Allow disk devices not to
        implement iterate().
This commit is contained in:
robertmh 2008-06-26 14:26:07 +00:00
parent 37aaf354c9
commit aebe3d13bb
6 changed files with 213 additions and 3 deletions
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137
disk/fs_uuid.c Normal file
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/* 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);
}