101 lines
3 KiB
C
101 lines
3 KiB
C
/*
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File: f2fs.c
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Copyright (C) 2018 Christophe GRENIER <grenier@cgsecurity.org>
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This software 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 2 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "common.h"
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#include "f2fs_fs.h"
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#include "f2fs.h"
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#include "log.h"
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extern const arch_fnct_t arch_none;
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static void set_f2fs_info(partition_t *partition, const struct f2fs_super_block*hdr)
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{
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partition->upart_type=UP_F2FS;
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partition->blocksize=1<<le32(hdr->log_blocksize);
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partition->fsname[0]='\0';
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if(partition->sb_offset==0)
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snprintf(partition->info, sizeof(partition->info), "F2FS, blocksize=%u", partition->blocksize);
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else
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snprintf(partition->info, sizeof(partition->info), "F2FS found using backup sector, blocksize=%u", partition->blocksize);
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}
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int check_f2fs(disk_t *disk, partition_t *partition)
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{
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unsigned char *buffer=(unsigned char*)MALLOC(F2FS_BLKSIZE);
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if(disk->pread(disk, buffer, F2FS_BLKSIZE, partition->part_offset + F2FS_SUPER_OFFSET) != F2FS_BLKSIZE)
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{
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free(buffer);
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return 1;
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}
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if(test_f2fs((struct f2fs_super_block*)buffer)!=0)
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{
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free(buffer);
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return 1;
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}
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set_f2fs_info(partition, (struct f2fs_super_block*)buffer);
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free(buffer);
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return 0;
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}
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int test_f2fs(const struct f2fs_super_block *hdr)
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{
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if(le32(hdr->magic) != F2FS_SUPER_MAGIC)
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return 1;
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/* Currently, support 512/1024/2048/4096 bytes sector size */
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if(le32(hdr->log_sectorsize) < 9 || le32(hdr->log_sectorsize) > 12)
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return 1;
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/* Currently, support only 4KB block size */
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if(le32(hdr->log_blocksize) != F2FS_BLKSIZE_BITS)
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return 1;
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if(le32(hdr->log_sectorsize) + le32(hdr->log_sectors_per_block) != le32(hdr->log_blocksize))
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return 1;
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/* check log blocks per segment */
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if(le32(hdr->log_blocks_per_seg) != 9)
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return 1;
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if(le64(hdr->block_count) == 0)
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return 1;
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return 0;
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}
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int recover_f2fs(const disk_t *disk, const struct f2fs_super_block *hdr, partition_t *partition)
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{
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if(test_f2fs(hdr)!=0)
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return 1;
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partition->sborg_offset=0;
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partition->sb_size=F2FS_BLKSIZE;
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partition->part_type_i386=P_LINUX;
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partition->part_type_gpt=GPT_ENT_TYPE_MS_BASIC_DATA;
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partition->part_size=(uint64_t)le64(hdr->block_count) << le32(hdr->log_blocksize);
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set_f2fs_info(partition, hdr);
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return 0;
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}
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