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diff --git a/src/f2fs_fs.h b/src/f2fs_fs.h
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+/*
+ File: f2fs_fs.h
+
+ Copyright (C) 2018 Christophe GRENIER <grenier@cgsecurity.org>
+
+ Superblock information from Samsung Electronics Co., Ltd. http://www.samsung.com/
+
+ 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.
+
+*/
+#ifndef F2FS_FS_H
+#define F2FS_FS_H
+
+#define F2FS_SUPER_MAGIC 0xF2F52010 /* F2FS Magic Number */
+
+#define F2FS_SUPER_OFFSET 1024 /* byte-size offset */
+#define F2FS_MIN_LOG_SECTOR_SIZE 9 /* 9 bits for 512 bytes */
+#define F2FS_MAX_LOG_SECTOR_SIZE 12 /* 12 bits for 4096 bytes */
+#define F2FS_LOG_SECTORS_PER_BLOCK 3 /* log number for sector/blk */
+#define F2FS_BLKSIZE 4096 /* support only 4KB block */
+#define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */
+#define F2FS_MAX_EXTENSION 64 /* # of extension entries */
+#define F2FS_EXTENSION_LEN 8 /* max size of extension */
+#define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
+
+/*
+ * For further optimization on multi-head logs, on-disk layout supports maximum
+ * 16 logs by default. The number, 16, is expected to cover all the cases
+ * enoughly. The implementaion currently uses no more than 6 logs.
+ * Half the logs are used for nodes, and the other half are used for data.
+ */
+#define MAX_ACTIVE_LOGS 16
+#define MAX_ACTIVE_NODE_LOGS 8
+#define MAX_ACTIVE_DATA_LOGS 8
+
+#define VERSION_LEN 256
+#define MAX_VOLUME_NAME 512
+#define MAX_PATH_LEN 64
+#define MAX_DEVICES 8
+
+#define F2FS_MAX_QUOTAS 3
+
+/*
+ * For superblock
+ */
+struct f2fs_device {
+ uint8_t path[MAX_PATH_LEN];
+ uint32_t total_segments;
+} __attribute__ ((gcc_struct, __packed__));
+
+struct f2fs_super_block {
+ uint32_t magic; /* Magic Number */
+ uint16_t major_ver; /* Major Version */
+ uint16_t minor_ver; /* Minor Version */
+ uint32_t log_sectorsize; /* log2 sector size in bytes */
+ uint32_t log_sectors_per_block; /* log2 # of sectors per block */
+ uint32_t log_blocksize; /* log2 block size in bytes */
+ uint32_t log_blocks_per_seg; /* log2 # of blocks per segment */
+ uint32_t segs_per_sec; /* # of segments per section */
+ uint32_t secs_per_zone; /* # of sections per zone */
+ uint32_t checksum_offset; /* checksum offset inside super block */
+ uint64_t block_count; /* total # of user blocks */
+ uint32_t section_count; /* total # of sections */
+ uint32_t segment_count; /* total # of segments */
+ uint32_t segment_count_ckpt; /* # of segments for checkpoint */
+ uint32_t segment_count_sit; /* # of segments for SIT */
+ uint32_t segment_count_nat; /* # of segments for NAT */
+ uint32_t segment_count_ssa; /* # of segments for SSA */
+ uint32_t segment_count_main; /* # of segments for main area */
+ uint32_t segment0_blkaddr; /* start block address of segment 0 */
+ uint32_t cp_blkaddr; /* start block address of checkpoint */
+ uint32_t sit_blkaddr; /* start block address of SIT */
+ uint32_t nat_blkaddr; /* start block address of NAT */
+ uint32_t ssa_blkaddr; /* start block address of SSA */
+ uint32_t main_blkaddr; /* start block address of main area */
+ uint32_t root_ino; /* root inode number */
+ uint32_t node_ino; /* node inode number */
+ uint32_t meta_ino; /* meta inode number */
+ uint8_t uuid[16]; /* 128-bit uuid for volume */
+ uint16_t volume_name[MAX_VOLUME_NAME]; /* volume name */
+ uint32_t extension_count; /* # of extensions below */
+ uint8_t extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */
+ uint32_t cp_payload;
+ uint8_t version[VERSION_LEN]; /* the kernel version */
+ uint8_t init_version[VERSION_LEN]; /* the initial kernel version */
+ uint32_t feature; /* defined features */
+ uint8_t encryption_level; /* versioning level for encryption */
+ uint8_t encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
+ struct f2fs_device devs[MAX_DEVICES]; /* device list */
+ uint32_t qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */
+ uint8_t hot_ext_count; /* # of hot file extension */
+ uint8_t reserved[314]; /* valid reserved region */
+} __attribute__ ((gcc_struct, __packed__));
+
+#endif /* F2FS_FS_H */