toys/e2fs.h

   1 /* vi: set ts=4:
   2  *
   3  * mke2fs.h - Headers for ext2
   4  *
   5  * Copyright 2006 Rob Landley <rob@landley.net>
   6  */
   7
   8 // Stuff defined in linux/ext2_fs.h
   9
  10 #define EXT2_SUPER_MAGIC  0xEF53
  11
  12 struct ext2_superblock {
  13         uint32_t inodes_count;      // Inodes count
  14         uint32_t blocks_count;      // Blocks count
  15         uint32_t r_blocks_count;    // Reserved blocks count
  16         uint32_t free_blocks_count; // Free blocks count
  17         uint32_t free_inodes_count; // Free inodes count
  18         uint32_t first_data_block;  // First Data Block
  19         uint32_t log_block_size;    // Block size
  20         uint32_t log_frag_size;     // Fragment size
  21         uint32_t blocks_per_group;  // Blocks per group
  22         uint32_t frags_per_group;   // Fragments per group
  23         uint32_t inodes_per_group;  // Inodes per group
  24         uint32_t mtime;             // Mount time
  25         uint32_t wtime;             // Write time
  26         uint16_t mnt_count;         // Mount count
  27         uint16_t max_mnt_count;     // Maximal mount count
  28         uint16_t magic;             // Magic signature
  29         uint16_t state;             // File system state
  30         uint16_t errors;            // Behaviour when detecting errors
  31         uint16_t minor_rev_level;   // minor revision level
  32         uint32_t lastcheck;         // time of last check
  33         uint32_t checkinterval;     // max. time between checks
  34         uint32_t creator_os;        // OS
  35         uint32_t rev_level;         // Revision level
  36         uint16_t def_resuid;        // Default uid for reserved blocks
  37         uint16_t def_resgid;        // Default gid for reserved blocks
  38         uint32_t first_ino;         // First non-reserved inode
  39         uint16_t inode_size;        // size of inode structure
  40         uint16_t block_group_nr;    // block group # of this superblock
  41         uint32_t feature_compat;    // compatible feature set
  42         uint32_t feature_incompat;  // incompatible feature set
  43         uint32_t feature_ro_compat; // readonly-compatible feature set
  44         char     uuid[16];          // 128-bit uuid for volume
  45         char     volume_name[16];   // volume name
  46         char     last_mounted[64];  // directory where last mounted
  47         uint32_t alg_usage_bitmap;  // For compression
  48         // For EXT2_COMPAT_PREALLOC
  49         uint8_t  prealloc_blocks;   // Nr of blocks to try to preallocate
  50         uint8_t  prealloc_dir_blocks; //Nr to preallocate for dirs
  51         uint16_t padding1;
  52         // For EXT3_FEATURE_COMPAT_HAS_JOURNAL
  53         uint8_t  journal_uuid[16];   // uuid of journal superblock
  54         uint32_t journal_inum;       // inode number of journal file
  55         uint32_t journal_dev;        // device number of journal file
  56         uint32_t last_orphan;        // start of list of inodes to delete
  57         uint32_t hash_seed[4];       // HTREE hash seed
  58         uint8_t  def_hash_version;   // Default hash version to use
  59         uint8_t  padding2[3];
  60         uint32_t default_mount_opts;
  61         uint32_t first_meta_bg;      // First metablock block group
  62         uint32_t mkfs_time;          // Creation timestamp
  63         uint32_t jnl_blocks[17];     // Backup of journal inode
  64         // uint32_t reserved[172];      // Padding to the end of the block
  65 };
  66
  67 struct ext2_group
  68 {
  69         uint32_t block_bitmap;       // Block number of block bitmap
  70         uint32_t inode_bitmap;       // Block number of inode bitmap
  71         uint32_t inode_table;        // Block number of inode table
  72         uint16_t free_blocks_count;  // How many free blocks in this group?
  73         uint16_t free_inodes_count;  // How many free inodes in this group?
  74         uint16_t used_dirs_count;    // How many directories?
  75         uint16_t reserved[7];        // pad to 32 bytes
  76 };
  77
  78 struct ext2_dentry {
  79         uint32_t inode;         // Inode number
  80     uint16_t rec_len;       // Directory entry length
  81     uint8_t  name_len;      // Name length
  82     uint8_t  file_type;
  83         char     name[255];     // File name
  84 };
  85
  86 struct ext2_inode {
  87         uint16_t mode;        // File mode
  88         uint16_t uid;         // Low 16 bits of Owner Uid
  89         uint32_t size;        // Size in bytes
  90         uint32_t atime;       // Access time
  91         uint32_t ctime;       // Creation time
  92         uint32_t mtime;       // Modification time
  93         uint32_t dtime;       // Deletion Time
  94         uint16_t gid;         // Low 16 bits of Group Id
  95         uint16_t links_count; // Links count
  96         uint32_t blocks;      // Blocks count
  97         uint32_t flags;       // File flags
  98         uint32_t reserved1;
  99         uint32_t block[15];   // Pointers to blocks
 100         uint32_t generation;  // File version (for NFS)
 101         uint32_t file_acl;    // File ACL
 102         uint32_t dir_acl;     // Directory ACL
 103         uint32_t faddr;       // Fragment address
 104         uint8_t  frag;        // Fragment number
 105         uint8_t  fsize;       // Fragment size
 106         uint16_t pad1;
 107         uint16_t uid_high;    // High bits of uid
 108         uint16_t gid_high;    // High bits of gid
 109         uint32_t reserved2;
 110 };
 111
 112
 113
 114 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 115 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 116 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 117 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 118 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 119 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 120
 121 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 122 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 123 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 124
 125 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 126 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 127 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 128 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 129 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 130
 131 #define EXT2_NAME_LEN 255
 132
 133 // Ext2 directory file types.  Only the low 3 bits are used.  The
 134 // other bits are reserved for now.
 135
 136 enum {
 137         EXT2_FT_UNKNOWN,
 138         EXT2_FT_REG_FILE,
 139         EXT2_FT_DIR,
 140         EXT2_FT_CHRDEV,
 141         EXT2_FT_BLKDEV,
 142         EXT2_FT_FIFO,
 143         EXT2_FT_SOCK,
 144         EXT2_FT_SYMLINK,
 145         EXT2_FT_MAX
 146 };