--- /dev/null
+#ifndef __EXT2_FS_H
+#define __EXT2_FS_H
+
+#include <stdint.h>
+
+#define EXT2_SUPER_MAGIC 0xEF53
+
+#define EXT2_GOOD_OLD_REV 0 // The good old (original) format
+#define EXT2_DYNAMIC_REV 1 // V2 format w/ dynamic inode sizes
+#define EXT2_GOOD_OLD_INODE_SIZE 128
+
+// Special inode numbers
+#define EXT2_BAD_INO 1 // Bad blocks inode
+#define EXT2_ROOT_INO 2 // Root inode
+#define EXT2_BOOT_LOADER_INO 5 // Boot loader inode
+#define EXT2_UNDEL_DIR_INO 6 // Undelete directory inode
+#define EXT3_RESIZE_INO 7 // Reserved group descriptors inode
+#define EXT3_JOURNAL_INO 8 // Journal inode
+
+// We're readonly, so we only care about incompat features.
+#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
+#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
+#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
+#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
+#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
+#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
+
+#define EXT2_NDIR_BLOCKS 12
+#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
+#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK+1)
+#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK+1)
+#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK+1)
+
+
+/* for EXT4 extent */
+#define EXT4_EXT_MAGIC 0xf30a
+#define EXT4_EXTENTS_FLAG 0x00080000
+
+/*
+ * File types and file modes
+ */
+#define S_IFDIR 0040000 // Directory
+#define S_IFCHR 0020000 // Character device
+#define S_IFBLK 0060000 // Block device
+#define S_IFREG 0100000 // Regular file
+#define S_IFIFO 0010000 // FIFO
+#define S_IFLNK 0120000 // Symbolic link
+#define S_IFSOCK 0140000 // Socket
+
+#define S_IFSHIFT 12
+
+#define T_IFDIR (S_IFDIR >> S_IFSHIFT)
+#define T_IFCHR (S_IFCHR >> S_IFSHIFT)
+#define T_IFBLK (S_IFBLK >> S_IFSHIFT)
+#define T_IFREG (S_IFREG >> S_IFSHIFT)
+#define T_IFIFO (S_IFIFO >> S_IFSHIFT)
+#define T_IFLNK (S_IFLNK >> S_IFSHIFT)
+#define T_IFSOCK (S_IFSOCK >> S_IFSHIFT)
+
+
+#define ext2_group_desc_lg2size 5
+
+
+
+/*
+ * super block structure:
+ * include/linux/ext2_fs.h
+ */
+struct ext2_super_block {
+ uint32_t s_inodes_count; /* Inodes count */
+ uint32_t s_blocks_count; /* Blocks count */
+ uint32_t s_r_blocks_count; /* Reserved blocks count */
+ uint32_t s_free_blocks_count; /* Free blocks count */
+ uint32_t s_free_inodes_count; /* Free inodes count */
+ uint32_t s_first_data_block; /* First Data Block */
+ uint32_t s_log_block_size; /* Block size */
+ uint32_t s_log_frag_size; /* Fragment size */
+ uint32_t s_blocks_per_group; /* # Blocks per group */
+ uint32_t s_frags_per_group; /* # Fragments per group */
+ uint32_t s_inodes_per_group; /* # Inodes per group */
+ uint32_t s_mtime; /* Mount time */
+ uint32_t s_wtime; /* Write time */
+ uint16_t s_mnt_count; /* Mount count */
+ int16_t s_max_mnt_count; /* Maximal mount count */
+ uint16_t s_magic; /* Magic signature */
+ uint16_t s_state; /* File system state */
+ uint16_t s_errors; /* Behaviour when detecting errors */
+ uint16_t s_minor_rev_level;
+ uint32_t s_lastcheck; /* time of last check */
+ uint32_t s_checkinterval; /* max. time between checks */
+ uint32_t s_creator_os; /* OS */
+ uint32_t s_rev_level; /* Revision level */
+ uint16_t s_def_resuid; /* Default uid for reserved blocks */
+ uint16_t s_def_resgid; /* Default gid for reserved blocks */
+
+ uint32_t s_first_ino; /* First non-reserved inode */
+ uint16_t s_inode_size; /* size of inode structure */
+ uint16_t s_block_group_nr; /* block group # of this superblock */
+ uint32_t s_feature_compat; /* compatible feature set */
+ uint32_t s_feature_incompat; /* incompatible feature set */
+ uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
+ uint8_t s_uuid[16]; /* 128-bit uuid for volume */
+ char s_volume_name[16]; /* volume name */
+ char s_last_mounted[64]; /* directory where last mounted */
+ uint32_t s_algorithm_usage_bitmap; /* For compression */
+ uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
+ uint8_t s_prealloc_dir_blocks;
+ uint16_t s_padding1;
+ uint32_t s_reserved[204]; /* Padding to the end of the block */
+};
+
+/*******************************************************************************
+#ifndef DEPEND
+#if ext2_super_block_size != 1024
+#error ext2_super_block definition bogus
+#endif
+#endif
+*******************************************************************************/
+
+/*
+ * ext2 group desc structure:
+ */
+struct ext2_group_desc {
+ uint32_t bg_block_bitmap; /* Blocks bitmap block */
+ uint32_t bg_inode_bitmap; /* Inodes bitmap block */
+ uint32_t bg_inode_table; /* Inodes table block */
+ uint16_t bg_free_blocks_count; /* Free blocks count */
+ uint16_t bg_free_inodes_count; /* Free inodes count */
+ uint16_t bg_used_dirs_count; /* Directories count */
+ uint16_t bg_pad;
+ uint32_t bg_reserved[3];
+};
+
+/*******************************************************************************
+#ifndef DEPEND
+#if ext2_group_desc_size != 32
+#error ext2_group_desc definition bogus
+#endif
+#endif
+*******************************************************************************/
+
+
+/*
+ * ext2 inode structure:
+ */
+struct ext2_inode {
+ uint16_t i_mode; /* File mode */
+ uint16_t i_uid; /* Owner Uid */
+ uint32_t i_size; /* 4: Size in bytes */
+ uint32_t i_atime; /* Access time */
+ uint32_t i_ctime; /* 12: Creation time */
+ uint32_t i_mtime; /* Modification time */
+ uint32_t i_dtime; /* 20: Deletion Time */
+ uint16_t i_gid; /* Group Id */
+ uint16_t i_links_count; /* 24: Links count */
+ uint32_t i_blocks; /* Blocks count */
+ uint32_t i_flags; /* 32: File flags */
+ uint32_t l_i_reserved1;
+ uint32_t i_block[EXT2_N_BLOCKS]; /* 40: Pointers to blocks */
+ uint32_t i_version; /* File version (for NFS) */
+ uint32_t i_file_acl; /* File ACL */
+ uint32_t i_dir_acl; /* Directory ACL */
+ uint32_t i_faddr; /* Fragment address */
+ uint8_t l_i_frag; /* Fragment number */
+ uint8_t l_i_fsize; /* Fragment size */
+ uint16_t i_pad1;
+ uint32_t l_i_reserved2[2];
+};
+
+/*******************************************************************************
+#ifndef DEPEND
+#if ext2_inode_size != 128
+#error ext2_inode definition bogus
+#endif
+#endif
+*******************************************************************************/
+
+
+#define EXT2_NAME_LEN 255
+struct ext2_dir_entry {
+ unsigned int d_inode; /* Inode number */
+ unsigned short d_rec_len; /* Directory entry length */
+ unsigned char d_name_len; /* Name length */
+ unsigned char d_file_type;
+ char d_name[EXT2_NAME_LEN]; /* File name */
+};
+
+/*******************************************************************************
+#define EXT2_DIR_PAD 4
+#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
+#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
+ ~EXT2_DIR_ROUND)
+*******************************************************************************/
+
+
+
+
+
+
+/*
+ * This is the extent on-disk structure.
+ * It's used at the bottom of the tree.
+ */
+struct ext4_extent {
+ uint32_t ee_block; /* first logical block extent covers */
+ uint16_t ee_len; /* number of blocks covered by extent */
+ uint16_t ee_start_hi; /* high 16 bits of physical block */
+ uint32_t ee_start_lo; /* low 32 bits of physical block */
+};
+
+/*
+ * This is index on-disk structure.
+ * It's used at all the levels except the bottom.
+ */
+struct ext4_extent_idx {
+ uint32_t ei_block; /* index covers logical blocks from 'block' */
+ uint32_t ei_leaf_lo; /* pointer to the physical block of the next *
+ * level. leaf or next index could be there */
+ uint16_t ei_leaf_hi; /* high 16 bits of physical block */
+ uint16_t ei_unused;
+};
+
+/*
+ * Each block (leaves and indexes), even inode-stored has header.
+ */
+struct ext4_extent_header {
+ uint16_t eh_magic; /* probably will support different formats */
+ uint16_t eh_entries; /* number of valid entries */
+ uint16_t eh_max; /* capacity of store in entries */
+ uint16_t eh_depth; /* has tree real underlying blocks? */
+ uint32_t eh_generation; /* generation of the tree */
+};
+
+
+
+#define EXT4_FIRST_EXTENT(header) ( (struct ext4_extent *)(header + 1) )
+#define EXT4_FIRST_INDEX(header) ( (struct ext4_extent_idx *) (header + 1) )
+
+
+
+
+
+
+
+/* function declartion */
+/*******************************************************************************
+extern struct open_file_t * ext2_read(char *);
+extern int ext2_read(struct open_file_t *, char *, int);
+*******************************************************************************/
+
+
+#endif /* ext2_fs.h */
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