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/* grub-setup.c - make GRUB usable */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011 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 <config.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/fiemap.h>
#include <grub/disk.h>
#include <grub/partition.h>
#include <grub/util/misc.h>
#include <grub/util/install.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void
grub_install_get_blocklist (grub_device_t root_dev,
const char *core_path,
const char *core_img __attribute__ ((unused)),
size_t core_size,
void (*callback) (grub_disk_addr_t sector,
unsigned offset,
unsigned length,
void *data),
void *hook_data)
{
grub_partition_t container = root_dev->disk->partition;
grub_uint64_t container_start = grub_partition_get_start (container);
struct fiemap fie1;
int fd;
/* Write the first two sectors of the core image onto the disk. */
grub_util_info ("opening the core image `%s'", core_path);
fd = open (core_path, O_RDONLY);
if (fd < 0)
grub_util_error (_("cannot open `%s': %s"), core_path,
strerror (errno));
grub_memset (&fie1, 0, sizeof (fie1));
fie1.fm_length = core_size;
fie1.fm_flags = FIEMAP_FLAG_SYNC;
if (ioctl (fd, FS_IOC_FIEMAP, &fie1) < 0)
{
int nblocks, i;
int bsize;
int mul;
grub_util_info ("FIEMAP failed. Reverting to FIBMAP");
if (ioctl (fd, FIGETBSZ, &bsize) < 0)
grub_util_error (_("can't retrieve blocklists: %s"),
strerror (errno));
if (bsize & (GRUB_DISK_SECTOR_SIZE - 1))
grub_util_error ("%s", _("blocksize is not divisible by 512"));
if (!bsize)
grub_util_error ("%s", _("invalid zero blocksize"));
mul = bsize >> GRUB_DISK_SECTOR_BITS;
nblocks = (core_size + bsize - 1) / bsize;
if (mul == 0 || nblocks == 0)
grub_util_error ("%s", _("can't retrieve blocklists"));
for (i = 0; i < nblocks; i++)
{
unsigned blk = i;
int rest;
if (ioctl (fd, FIBMAP, &blk) < 0)
grub_util_error (_("can't retrieve blocklists: %s"),
strerror (errno));
rest = core_size - ((i * mul) << GRUB_DISK_SECTOR_BITS);
if (rest <= 0)
break;
if (rest > GRUB_DISK_SECTOR_SIZE * mul)
rest = GRUB_DISK_SECTOR_SIZE * mul;
callback (((grub_uint64_t) blk) * mul
+ container_start,
0, rest, hook_data);
}
}
else
{
struct fiemap *fie2;
int i;
fie2 = xmalloc (sizeof (*fie2)
+ fie1.fm_mapped_extents
* sizeof (fie1.fm_extents[1]));
memset (fie2, 0, sizeof (*fie2)
+ fie1.fm_mapped_extents * sizeof (fie2->fm_extents[1]));
fie2->fm_length = core_size;
fie2->fm_flags = FIEMAP_FLAG_SYNC;
fie2->fm_extent_count = fie1.fm_mapped_extents;
if (ioctl (fd, FS_IOC_FIEMAP, fie2) < 0)
grub_util_error (_("can't retrieve blocklists: %s"),
strerror (errno));
for (i = 0; i < fie2->fm_mapped_extents; i++)
{
callback ((fie2->fm_extents[i].fe_physical
>> GRUB_DISK_SECTOR_BITS)
+ container_start,
fie2->fm_extents[i].fe_physical
& (GRUB_DISK_SECTOR_SIZE - 1),
fie2->fm_extents[i].fe_length, hook_data);
}
free (fie2);
}
close (fd);
}
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