2012-11-13 15:14:08 -08:00
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/* mke2fs.h - Headers for ext2
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2007-01-23 10:20:38 -08:00
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*
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* Copyright 2006 Rob Landley <rob@landley.net>
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*/
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// Stuff defined in linux/ext2_fs.h
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#define EXT2_SUPER_MAGIC 0xEF53
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2007-01-23 16:54:01 -08:00
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struct ext2_superblock {
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uint32_t inodes_count; // Inodes count
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uint32_t blocks_count; // Blocks count
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uint32_t r_blocks_count; // Reserved blocks count
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uint32_t free_blocks_count; // Free blocks count
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uint32_t free_inodes_count; // Free inodes count
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uint32_t first_data_block; // First Data Block
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uint32_t log_block_size; // Block size
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uint32_t log_frag_size; // Fragment size
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uint32_t blocks_per_group; // Blocks per group
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uint32_t frags_per_group; // Fragments per group
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uint32_t inodes_per_group; // Inodes per group
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uint32_t mtime; // Mount time
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uint32_t wtime; // Write time
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uint16_t mnt_count; // Mount count
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uint16_t max_mnt_count; // Maximal mount count
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uint16_t magic; // Magic signature
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uint16_t state; // File system state
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uint16_t errors; // Behaviour when detecting errors
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uint16_t minor_rev_level; // minor revision level
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uint32_t lastcheck; // time of last check
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uint32_t checkinterval; // max. time between checks
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uint32_t creator_os; // OS
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uint32_t rev_level; // Revision level
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uint16_t def_resuid; // Default uid for reserved blocks
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uint16_t def_resgid; // Default gid for reserved blocks
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uint32_t first_ino; // First non-reserved inode
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uint16_t inode_size; // size of inode structure
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uint16_t block_group_nr; // block group # of this superblock
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uint32_t feature_compat; // compatible feature set
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uint32_t feature_incompat; // incompatible feature set
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uint32_t feature_ro_compat; // readonly-compatible feature set
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char uuid[16]; // 128-bit uuid for volume
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char volume_name[16]; // volume name
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char last_mounted[64]; // directory where last mounted
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uint32_t alg_usage_bitmap; // For compression
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// For EXT2_COMPAT_PREALLOC
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uint8_t prealloc_blocks; // Nr of blocks to try to preallocate
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uint8_t prealloc_dir_blocks; //Nr to preallocate for dirs
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uint16_t padding1;
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// For EXT3_FEATURE_COMPAT_HAS_JOURNAL
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uint8_t journal_uuid[16]; // uuid of journal superblock
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uint32_t journal_inum; // inode number of journal file
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uint32_t journal_dev; // device number of journal file
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uint32_t last_orphan; // start of list of inodes to delete
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uint32_t hash_seed[4]; // HTREE hash seed
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uint8_t def_hash_version; // Default hash version to use
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uint8_t padding2[3];
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uint32_t default_mount_opts;
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uint32_t first_meta_bg; // First metablock block group
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uint32_t mkfs_time; // Creation timestamp
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uint32_t jnl_blocks[17]; // Backup of journal inode
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// uint32_t reserved[172]; // Padding to the end of the block
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};
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2007-01-27 12:10:48 -08:00
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struct ext2_group
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{
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uint32_t block_bitmap; // Block number of block bitmap
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uint32_t inode_bitmap; // Block number of inode bitmap
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uint32_t inode_table; // Block number of inode table
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uint16_t free_blocks_count; // How many free blocks in this group?
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uint16_t free_inodes_count; // How many free inodes in this group?
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uint16_t used_dirs_count; // How many directories?
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uint16_t reserved[7]; // pad to 32 bytes
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};
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struct ext2_dentry {
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uint32_t inode; // Inode number
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uint16_t rec_len; // Directory entry length
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uint8_t name_len; // Name length
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uint8_t file_type;
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char name[0]; // File name
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};
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struct ext2_inode {
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uint16_t mode; // File mode
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uint16_t uid; // Low 16 bits of Owner Uid
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uint32_t size; // Size in bytes
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uint32_t atime; // Access time
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uint32_t ctime; // Creation time
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uint32_t mtime; // Modification time
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uint32_t dtime; // Deletion Time
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uint16_t gid; // Low 16 bits of Group Id
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uint16_t links_count; // Links count
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uint32_t blocks; // Blocks count
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uint32_t flags; // File flags
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uint32_t reserved1;
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uint32_t block[15]; // Pointers to blocks
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uint32_t generation; // File version (for NFS)
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uint32_t file_acl; // File ACL
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uint32_t dir_acl; // Directory ACL (or top bits of file length)
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uint32_t faddr; // Last block in file
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uint8_t frag; // Fragment number
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uint8_t fsize; // Fragment size
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uint16_t pad1;
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uint16_t uid_high; // High bits of uid
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uint16_t gid_high; // High bits of gid
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uint32_t reserved2;
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};
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2007-01-23 10:20:38 -08:00
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#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
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#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
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#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
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#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
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#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
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#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
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#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
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#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
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#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
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#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
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#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
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#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
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#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
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#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
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#define EXT2_NAME_LEN 255
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// Ext2 directory file types. Only the low 3 bits are used. The
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// other bits are reserved for now.
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enum {
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EXT2_FT_UNKNOWN,
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EXT2_FT_REG_FILE,
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EXT2_FT_DIR,
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EXT2_FT_CHRDEV,
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EXT2_FT_BLKDEV,
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EXT2_FT_FIFO,
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EXT2_FT_SOCK,
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EXT2_FT_SYMLINK,
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EXT2_FT_MAX
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};
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