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/* vi: set ts=4:
*
* mke2fs.h - Headers for ext2
*
* Copyright 2006 Rob Landley <rob@landley.net>
*/
// 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
uint32_t faddr; // Fragment address
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
};
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