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