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/*
File: btrfs.c
Copyright (C) 2011 Christophe GRENIER <grenier@cgsecurity.org>
This software 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "types.h"
#include "common.h"
#include "btrfs.h"
#include "fnctdsk.h"
#include "log.h"
#include "guid_cpy.h"
static int test_btrfs(const struct btrfs_super_block *sb);
static void set_btrfs_info(const struct btrfs_super_block *sb, partition_t *partition)
{
partition->upart_type=UP_BTRFS;
partition->blocksize=le32(sb->dev_item.sector_size);
set_part_name(partition, sb->label, sizeof(sb->label));
snprintf(partition->info, sizeof(partition->info), "btrfs blocksize=%u", partition->blocksize);
if(le64(sb->bytenr)!=partition->part_offset + BTRFS_SUPER_INFO_OFFSET)
{
strcat(partition->info," Backup superblock");
}
/* last mounted => date */
}
int check_btrfs(disk_t *disk_car,partition_t *partition)
{
unsigned char *buffer=(unsigned char*)MALLOC(BTRFS_SUPER_INFO_SIZE);
if(disk_car->pread(disk_car, buffer, BTRFS_SUPER_INFO_SIZE, partition->part_offset + BTRFS_SUPER_INFO_OFFSET) != BTRFS_SUPER_INFO_SIZE)
{
free(buffer);
return 1;
}
if(test_btrfs((struct btrfs_super_block*)buffer)!=0)
{
free(buffer);
return 1;
}
set_btrfs_info((struct btrfs_super_block*)buffer, partition);
free(buffer);
return 0;
}
/*
Primary superblock is at 1024 (SUPERBLOCK_OFFSET)
Group 0 begin at s_first_data_block
*/
int recover_btrfs(const disk_t *disk, const struct btrfs_super_block *sb, partition_t *partition, const int verbose, const int dump_ind)
{
if(test_btrfs(sb)!=0)
return 1;
if(dump_ind!=0)
{
if(partition!=NULL && disk!=NULL)
log_info("\nbtrfs magic value at %u/%u/%u\n",
offset2cylinder(disk,partition->part_offset),
offset2head(disk,partition->part_offset),
offset2sector(disk,partition->part_offset));
dump_log(sb, BTRFS_SUPER_INFO_SIZE);
}
if(partition==NULL)
return 0;
set_btrfs_info(sb, partition);
partition->part_type_i386=P_LINUX;
partition->part_type_mac=PMAC_LINUX;
partition->part_type_sun=PSUN_LINUX;
partition->part_type_gpt=GPT_ENT_TYPE_LINUX_DATA;
partition->part_size=(uint64_t)le64(sb->dev_item.total_bytes);
guid_cpy(&partition->part_uuid, (const efi_guid_t *)&sb->fsid);
if(verbose>0)
{
log_info("\n");
}
partition->sborg_offset=BTRFS_SUPER_INFO_OFFSET;
partition->sb_size=BTRFS_SUPER_INFO_SIZE;
if(verbose>0)
{
if(disk==NULL)
log_info("recover_btrfs: part_size %lu\n", (long unsigned)(partition->part_size / le32(sb->dev_item.sector_size)));
else
log_info("recover_btrfs: part_size %lu\n", (long unsigned)(partition->part_size / disk->sector_size));
}
return 0;
}
static int test_btrfs(const struct btrfs_super_block *sb)
{
if(memcmp(&sb->magic, BTRFS_MAGIC, 8)!=0)
return 1;
if(le32(sb->dev_item.sector_size)==0)
return 1;
return 0;
}
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