aboutsummaryrefslogtreecommitdiff
path: root/toys/e2fs.h
blob: 5a2cb64dd5f076c69152ed9e86c7370346c9bbd7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/* 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
};