/* mke2fs.h - Headers for ext2 * * Copyright 2006 Rob Landley */ // Stuff defined in linux/ext2_fs.h #define EXT2_SUPER_MAGIC 0xEF53 struct ext2_superblock { uint32_t inodes_count; // Inodes count uint32_t blocks_count; // Blocks count uint32_t r_blocks_count; // Reserved blocks count uint32_t free_blocks_count; // Free blocks count uint32_t free_inodes_count; // Free inodes count uint32_t first_data_block; // First Data Block uint32_t log_block_size; // Block size uint32_t log_frag_size; // Fragment size uint32_t blocks_per_group; // Blocks per group uint32_t frags_per_group; // Fragments per group uint32_t inodes_per_group; // Inodes per group uint32_t mtime; // Mount time uint32_t wtime; // Write time uint16_t mnt_count; // Mount count uint16_t max_mnt_count; // Maximal mount count uint16_t magic; // Magic signature uint16_t state; // File system state uint16_t errors; // Behaviour when detecting errors uint16_t minor_rev_level; // minor revision level uint32_t lastcheck; // time of last check uint32_t checkinterval; // max. time between checks uint32_t creator_os; // OS uint32_t rev_level; // Revision level uint16_t def_resuid; // Default uid for reserved blocks uint16_t def_resgid; // Default gid for reserved blocks uint32_t first_ino; // First non-reserved inode uint16_t inode_size; // size of inode structure uint16_t block_group_nr; // block group # of this superblock uint32_t feature_compat; // compatible feature set uint32_t feature_incompat; // incompatible feature set uint32_t feature_ro_compat; // readonly-compatible feature set char uuid[16]; // 128-bit uuid for volume char volume_name[16]; // volume name char last_mounted[64]; // directory where last mounted uint32_t alg_usage_bitmap; // For compression // For EXT2_COMPAT_PREALLOC uint8_t prealloc_blocks; // Nr of blocks to try to preallocate uint8_t prealloc_dir_blocks; //Nr to preallocate for dirs uint16_t padding1; // For EXT3_FEATURE_COMPAT_HAS_JOURNAL uint8_t journal_uuid[16]; // uuid of journal superblock uint32_t journal_inum; // inode number of journal file uint32_t journal_dev; // device number of journal file uint32_t last_orphan; // start of list of inodes to delete uint32_t hash_seed[4]; // HTREE hash seed uint8_t def_hash_version; // Default hash version to use uint8_t padding2[3]; uint32_t default_mount_opts; uint32_t first_meta_bg; // First metablock block group uint32_t mkfs_time; // Creation timestamp uint32_t jnl_blocks[17]; // Backup of journal inode // uint32_t reserved[172]; // Padding to the end of the block }; struct ext2_group { uint32_t block_bitmap; // Block number of block bitmap uint32_t inode_bitmap; // Block number of inode bitmap uint32_t inode_table; // Block number of inode table uint16_t free_blocks_count; // How many free blocks in this group? uint16_t free_inodes_count; // How many free inodes in this group? uint16_t used_dirs_count; // How many directories? uint16_t reserved[7]; // pad to 32 bytes }; struct ext2_dentry { uint32_t inode; // Inode number uint16_t rec_len; // Directory entry length uint8_t name_len; // Name length uint8_t file_type; char name[0]; // File name }; struct ext2_inode { uint16_t mode; // File mode uint16_t uid; // Low 16 bits of Owner Uid uint32_t size; // Size in bytes uint32_t atime; // Access time uint32_t ctime; // Creation time uint32_t mtime; // Modification time uint32_t dtime; // Deletion Time uint16_t gid; // Low 16 bits of Group Id uint16_t links_count; // Links count uint32_t blocks; // Blocks count uint32_t flags; // File flags uint32_t reserved1; uint32_t block[15]; // Pointers to blocks uint32_t generation; // File version (for NFS) uint32_t file_acl; // File ACL uint32_t dir_acl; // Directory ACL (or top bits of file length) uint32_t faddr; // Last block in file uint8_t frag; // Fragment number uint8_t fsize; // Fragment size uint16_t pad1; uint16_t uid_high; // High bits of uid uint16_t gid_high; // High bits of gid uint32_t reserved2; }; #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 #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_NAME_LEN 255 // Ext2 directory file types. Only the low 3 bits are used. The // other bits are reserved for now. enum { EXT2_FT_UNKNOWN, EXT2_FT_REG_FILE, EXT2_FT_DIR, EXT2_FT_CHRDEV, EXT2_FT_BLKDEV, EXT2_FT_FIFO, EXT2_FT_SOCK, EXT2_FT_SYMLINK, EXT2_FT_MAX };