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/*
File: f2fs.c
Copyright (C) 2018 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
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "f2fs_fs.h"
#include "f2fs.h"
#include "log.h"
extern const arch_fnct_t arch_none;
static void set_f2fs_info(partition_t *partition, const struct f2fs_super_block*hdr)
{
partition->upart_type=UP_F2FS;
partition->blocksize=1<<le32(hdr->log_blocksize);
partition->fsname[0]='\0';
if(partition->sb_offset==0)
snprintf(partition->info, sizeof(partition->info), "F2FS, blocksize=%u", partition->blocksize);
else
snprintf(partition->info, sizeof(partition->info), "F2FS found using backup sector, blocksize=%u", partition->blocksize);
}
int check_f2fs(disk_t *disk, partition_t *partition)
{
unsigned char *buffer=(unsigned char*)MALLOC(F2FS_BLKSIZE);
if(disk->pread(disk, buffer, F2FS_BLKSIZE, partition->part_offset + F2FS_SUPER_OFFSET) != F2FS_BLKSIZE)
{
free(buffer);
return 1;
}
if(test_f2fs((struct f2fs_super_block*)buffer)!=0)
{
free(buffer);
return 1;
}
set_f2fs_info(partition, (struct f2fs_super_block*)buffer);
free(buffer);
return 0;
}
int test_f2fs(const struct f2fs_super_block *hdr)
{
if(le32(hdr->magic) != F2FS_SUPER_MAGIC)
return 1;
/* Currently, support 512/1024/2048/4096 bytes sector size */
if(le32(hdr->log_sectorsize) < 9 || le32(hdr->log_sectorsize) > 12)
return 1;
/* Currently, support only 4KB block size */
if(le32(hdr->log_blocksize) != F2FS_BLKSIZE_BITS)
return 1;
if(le32(hdr->log_sectorsize) + le32(hdr->log_sectors_per_block) != le32(hdr->log_blocksize))
return 1;
/* check log blocks per segment */
if(le32(hdr->log_blocks_per_seg) != 9)
return 1;
if(le64(hdr->block_count) == 0)
return 1;
return 0;
}
int recover_f2fs(const disk_t *disk, const struct f2fs_super_block *hdr, partition_t *partition)
{
if(test_f2fs(hdr)!=0)
return 1;
partition->sborg_offset=0;
partition->sb_size=F2FS_BLKSIZE;
partition->part_type_i386=P_LINUX;
partition->part_type_gpt=GPT_ENT_TYPE_MS_BASIC_DATA;
partition->part_size=(uint64_t)le64(hdr->block_count) << le32(hdr->log_blocksize);
set_f2fs_info(partition, hdr);
return 0;
}
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