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Split out blocklist retrieving from setup.c to

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grub-core/osdep/blocklist.c and add windows implementation since
	generic version doesn't work on NTFS on Windows due to aggressive
	unflushable cache.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-10-15 17:02:26 +02:00
parent c06c75201c
commit 5a869940de
13 changed files with 602 additions and 288 deletions
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132
grub-core/osdep/generic/blocklist.c Normal file
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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 <grub/disk.h>
#include <grub/file.h>
#include <grub/partition.h>
#include <grub/util/misc.h>
#include <grub/util/install.h>
#include <grub/emu/hostdisk.h>
#define MAX_TRIES 5
void
grub_install_get_blocklist (grub_device_t root_dev,
const char *core_path, const char *core_img,
size_t core_size,
void (*callback) (grub_disk_addr_t sector,
unsigned offset,
unsigned length,
void *data),
void *hook_data)
{
int i;
char *tmp_img;
char *core_path_dev;
core_path_dev = grub_make_system_path_relative_to_its_root (core_path);
/* Make sure that GRUB reads the identical image as the OS. */
tmp_img = xmalloc (core_size);
for (i = 0; i < MAX_TRIES; i++)
{
grub_file_t file;
grub_util_info ((i == 0) ? _("attempting to read the core image `%s' from GRUB")
: _("attempting to read the core image `%s' from GRUB again"),
core_path_dev);
grub_disk_cache_invalidate_all ();
grub_file_filter_disable_compression ();
file = grub_file_open (core_path_dev);
if (file)
{
if (grub_file_size (file) != core_size)
grub_util_info ("succeeded in opening the core image but the size is different (%d != %d)",
(int) grub_file_size (file), (int) core_size);
else if (grub_file_read (file, tmp_img, core_size)
!= (grub_ssize_t) core_size)
grub_util_info ("succeeded in opening the core image but cannot read %d bytes",
(int) core_size);
else if (memcmp (core_img, tmp_img, core_size) != 0)
{
#if 0
FILE *dump;
FILE *dump2;
dump = fopen ("dump.img", "wb");
if (dump)
{
fwrite (tmp_img, 1, core_size, dump);
fclose (dump);
}
dump2 = fopen ("dump2.img", "wb");
if (dump2)
{
fwrite (core_img, 1, core_size, dump2);
fclose (dump2);
}
#endif
grub_util_info ("succeeded in opening the core image but the data is different");
}
else
{
grub_file_close (file);
break;
}
grub_file_close (file);
}
else
grub_util_info ("couldn't open the core image");
if (grub_errno)
grub_util_info ("error message = %s", grub_errmsg);
grub_errno = GRUB_ERR_NONE;
grub_util_biosdisk_flush (root_dev->disk);
sleep (1);
}
if (i == MAX_TRIES)
grub_util_error (_("cannot read `%s' correctly"), core_path_dev);
grub_file_t file;
/* Now read the core image to determine where the sectors are. */
grub_file_filter_disable_compression ();
file = grub_file_open (core_path_dev);
if (! file)
grub_util_error ("%s", grub_errmsg);
file->read_hook = callback;
file->read_hook_data = hook_data;
if (grub_file_read (file, tmp_img, core_size) != (grub_ssize_t) core_size)
grub_util_error ("%s", _("failed to read the sectors of the core image"));
grub_file_close (file);
free (tmp_img);
free (core_path_dev);
}