1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * linux/include/linux/ext2_fs.h
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4 | *
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5 | * Copyright (C) 1992, 1993, 1994, 1995
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6 | * Remy Card (card@masi.ibp.fr)
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7 | * Laboratoire MASI - Institut Blaise Pascal
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8 | * Universite Pierre et Marie Curie (Paris VI)
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9 | *
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10 | * Copyright (C) 1991, 1992 Linus Torvalds
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11 | */
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12 |
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13 | #ifndef _LINUX_EXT2_FS_H
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14 | #define _LINUX_EXT2_FS_H
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15 |
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16 | /*
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17 | * Special inode numbers
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18 | */
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19 | #define EXT2_BAD_INO 1 /* Bad blocks inode */
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20 | #define EXT2_ROOT_INO 2 /* Root inode */
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21 | #define EXT2_ACL_IDX_INO 3 /* ACL inode */
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22 | #define EXT2_ACL_DATA_INO 4 /* ACL inode */
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23 | #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
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24 | #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
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25 | #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
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26 | #define EXT2_JOURNAL_INO 8 /* Journal inode */
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27 |
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28 | /* First non-reserved inode for old ext2 filesystems */
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29 | #define EXT2_GOOD_OLD_FIRST_INO 11
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30 |
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31 | /*
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32 | * The second extended file system magic number
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33 | */
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34 | #define EXT2_SUPER_MAGIC 0xEF53
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35 |
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36 | /* Assume that user mode programs are passing in an ext2fs superblock, not
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37 | * a kernel struct super_block. This will allow us to call the feature-test
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38 | * macros from user land. */
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39 | #define EXT2_SB(sb) (sb)
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40 |
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41 | /*
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42 | * Maximal count of links to a file
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43 | */
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44 | #define EXT2_LINK_MAX 32000
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45 |
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46 | /*
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47 | * Macro-instructions used to manage several block sizes
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48 | */
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49 | #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
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50 | #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
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51 | #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
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52 | #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
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53 | #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
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54 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
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55 | #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
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56 | EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
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57 | #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
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58 | EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
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59 | #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))
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60 |
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61 | /*
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62 | * Macro-instructions used to manage fragments
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63 | */
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64 | #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
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65 | #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
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66 | #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
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67 | #define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
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68 | #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
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69 |
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70 | /*
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71 | * ACL structures
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72 | */
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73 | struct ext2_acl_header { /* Header of Access Control Lists */
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74 | uint32_t aclh_size;
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75 | uint32_t aclh_file_count;
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76 | uint32_t aclh_acle_count;
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77 | uint32_t aclh_first_acle;
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78 | };
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79 |
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80 | struct ext2_acl_entry { /* Access Control List Entry */
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81 | uint32_t acle_size;
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82 | uint16_t acle_perms; /* Access permissions */
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83 | uint16_t acle_type; /* Type of entry */
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84 | uint16_t acle_tag; /* User or group identity */
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85 | uint16_t acle_pad1;
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86 | uint32_t acle_next; /* Pointer on next entry for the */
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87 | /* same inode or on next free entry */
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88 | };
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89 |
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90 | /*
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91 | * Structure of a blocks group descriptor
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92 | */
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93 | struct ext2_group_desc {
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94 | uint32_t bg_block_bitmap; /* Blocks bitmap block */
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95 | uint32_t bg_inode_bitmap; /* Inodes bitmap block */
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96 | uint32_t bg_inode_table; /* Inodes table block */
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97 | uint16_t bg_free_blocks_count; /* Free blocks count */
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98 | uint16_t bg_free_inodes_count; /* Free inodes count */
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99 | uint16_t bg_used_dirs_count; /* Directories count */
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100 | uint16_t bg_pad;
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101 | uint32_t bg_reserved[3];
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102 | };
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103 |
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104 | /*
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105 | * Data structures used by the directory indexing feature
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106 | *
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107 | * Note: all of the multibyte integer fields are little endian.
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108 | */
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109 |
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110 | /*
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111 | * Note: dx_root_info is laid out so that if it should somehow get
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112 | * overlaid by a dirent the two low bits of the hash version will be
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113 | * zero. Therefore, the hash version mod 4 should never be 0.
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114 | * Sincerely, the paranoia department.
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115 | */
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116 | struct ext2_dx_root_info {
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117 | uint32_t reserved_zero;
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118 | uint8_t hash_version; /* 0 now, 1 at release */
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119 | uint8_t info_length; /* 8 */
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120 | uint8_t indirect_levels;
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121 | uint8_t unused_flags;
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122 | };
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123 |
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124 | #define EXT2_HASH_LEGACY 0
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125 | #define EXT2_HASH_HALF_MD4 1
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126 | #define EXT2_HASH_TEA 2
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127 |
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128 | #define EXT2_HASH_FLAG_INCOMPAT 0x1
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129 |
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130 | struct ext2_dx_entry {
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131 | uint32_t hash;
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132 | uint32_t block;
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133 | };
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134 |
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135 | struct ext2_dx_countlimit {
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136 | uint16_t limit;
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137 | uint16_t count;
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138 | };
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139 |
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140 |
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141 | /*
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142 | * Macro-instructions used to manage group descriptors
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143 | */
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144 | #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
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145 | #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
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146 | #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
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147 | /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
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148 | #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8)
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149 | #define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
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150 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
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151 |
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152 | /*
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153 | * Constants relative to the data blocks
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154 | */
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155 | #define EXT2_NDIR_BLOCKS 12
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156 | #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
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157 | #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
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158 | #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
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159 | #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
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160 |
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161 | /*
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162 | * Inode flags
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163 | */
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164 | #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
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165 | #define EXT2_UNRM_FL 0x00000002 /* Undelete */
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166 | #define EXT2_COMPR_FL 0x00000004 /* Compress file */
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167 | #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
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168 | #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
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169 | #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
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170 | #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
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171 | #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
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172 | /* Reserved for compression usage... */
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173 | #define EXT2_DIRTY_FL 0x00000100
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174 | #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
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175 | #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
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176 | #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
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177 | /* End compression flags --- maybe not all used */
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178 | #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
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179 | #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
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180 | #define EXT2_IMAGIC_FL 0x00002000
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181 | #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
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182 | #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
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183 | #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
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184 | #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
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185 | #define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
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186 | #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
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187 |
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188 | #define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
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189 | #define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
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190 |
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191 | /*
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192 | * ioctl commands
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193 | */
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194 | #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
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195 | #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
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196 | #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
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197 | #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
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198 |
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199 | /*
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200 | * Structure of an inode on the disk
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201 | */
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202 | struct ext2_inode {
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203 | uint16_t i_mode; /* File mode */
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204 | uint16_t i_uid; /* Low 16 bits of Owner Uid */
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205 | uint32_t i_size; /* Size in bytes */
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206 | uint32_t i_atime; /* Access time */
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207 | uint32_t i_ctime; /* Creation time */
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208 | uint32_t i_mtime; /* Modification time */
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209 | uint32_t i_dtime; /* Deletion Time */
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210 | uint16_t i_gid; /* Low 16 bits of Group Id */
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211 | uint16_t i_links_count; /* Links count */
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212 | uint32_t i_blocks; /* Blocks count */
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213 | uint32_t i_flags; /* File flags */
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214 | union {
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215 | struct {
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216 | uint32_t l_i_reserved1;
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217 | } linux1;
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218 | struct {
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219 | uint32_t h_i_translator;
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220 | } hurd1;
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221 | struct {
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222 | uint32_t m_i_reserved1;
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223 | } masix1;
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224 | } osd1; /* OS dependent 1 */
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225 | uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
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226 | uint32_t i_generation; /* File version (for NFS) */
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227 | uint32_t i_file_acl; /* File ACL */
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228 | uint32_t i_dir_acl; /* Directory ACL */
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229 | uint32_t i_faddr; /* Fragment address */
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230 | union {
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231 | struct {
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232 | uint8_t l_i_frag; /* Fragment number */
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233 | uint8_t l_i_fsize; /* Fragment size */
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234 | uint16_t i_pad1;
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235 | uint16_t l_i_uid_high; /* these 2 fields */
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236 | uint16_t l_i_gid_high; /* were reserved2[0] */
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237 | uint32_t l_i_reserved2;
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238 | } linux2;
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239 | struct {
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240 | uint8_t h_i_frag; /* Fragment number */
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241 | uint8_t h_i_fsize; /* Fragment size */
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242 | uint16_t h_i_mode_high;
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243 | uint16_t h_i_uid_high;
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244 | uint16_t h_i_gid_high;
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245 | uint32_t h_i_author;
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246 | } hurd2;
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247 | struct {
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248 | uint8_t m_i_frag; /* Fragment number */
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249 | uint8_t m_i_fsize; /* Fragment size */
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250 | uint16_t m_pad1;
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251 | uint32_t m_i_reserved2[2];
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252 | } masix2;
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253 | } osd2; /* OS dependent 2 */
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254 | };
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255 |
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256 | /*
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257 | * Permanent part of an large inode on the disk
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258 | */
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259 | struct ext2_inode_large {
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260 | uint16_t i_mode; /* File mode */
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261 | uint16_t i_uid; /* Low 16 bits of Owner Uid */
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262 | uint32_t i_size; /* Size in bytes */
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263 | uint32_t i_atime; /* Access time */
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264 | uint32_t i_ctime; /* Creation time */
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265 | uint32_t i_mtime; /* Modification time */
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266 | uint32_t i_dtime; /* Deletion Time */
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267 | uint16_t i_gid; /* Low 16 bits of Group Id */
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268 | uint16_t i_links_count; /* Links count */
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269 | uint32_t i_blocks; /* Blocks count */
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270 | uint32_t i_flags; /* File flags */
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271 | union {
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272 | struct {
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273 | uint32_t l_i_reserved1;
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274 | } linux1;
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275 | struct {
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276 | uint32_t h_i_translator;
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277 | } hurd1;
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278 | struct {
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279 | uint32_t m_i_reserved1;
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280 | } masix1;
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281 | } osd1; /* OS dependent 1 */
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282 | uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
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283 | uint32_t i_generation; /* File version (for NFS) */
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284 | uint32_t i_file_acl; /* File ACL */
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285 | uint32_t i_dir_acl; /* Directory ACL */
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286 | uint32_t i_faddr; /* Fragment address */
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287 | union {
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288 | struct {
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289 | uint8_t l_i_frag; /* Fragment number */
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290 | uint8_t l_i_fsize; /* Fragment size */
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291 | uint16_t i_pad1;
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292 | uint16_t l_i_uid_high; /* these 2 fields */
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293 | uint16_t l_i_gid_high; /* were reserved2[0] */
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294 | uint32_t l_i_reserved2;
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295 | } linux2;
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296 | struct {
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297 | uint8_t h_i_frag; /* Fragment number */
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298 | uint8_t h_i_fsize; /* Fragment size */
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299 | uint16_t h_i_mode_high;
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300 | uint16_t h_i_uid_high;
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301 | uint16_t h_i_gid_high;
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302 | uint32_t h_i_author;
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303 | } hurd2;
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304 | struct {
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305 | uint8_t m_i_frag; /* Fragment number */
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306 | uint8_t m_i_fsize; /* Fragment size */
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307 | uint16_t m_pad1;
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308 | uint32_t m_i_reserved2[2];
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309 | } masix2;
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310 | } osd2; /* OS dependent 2 */
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311 | uint16_t i_extra_isize;
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312 | uint16_t i_pad1;
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313 | };
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314 |
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315 | #define i_size_high i_dir_acl
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316 |
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317 | /*
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318 | * File system states
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319 | */
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320 | #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
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321 | #define EXT2_ERROR_FS 0x0002 /* Errors detected */
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322 |
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323 | /*
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324 | * Mount flags
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325 | */
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326 | #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
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327 | #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
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328 | #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
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329 | #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
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330 | #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
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331 | #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
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332 | #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
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333 | #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
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334 |
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335 | #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
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336 | #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
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337 | #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
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338 | EXT2_MOUNT_##opt)
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339 | /*
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340 | * Maximal mount counts between two filesystem checks
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341 | */
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342 | #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
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343 | #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
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344 |
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345 | /*
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346 | * Behaviour when detecting errors
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347 | */
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348 | #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
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349 | #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
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350 | #define EXT2_ERRORS_PANIC 3 /* Panic */
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351 | #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
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352 |
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353 | /*
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354 | * Structure of the super block
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355 | */
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356 | struct ext2_super_block {
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357 | uint32_t s_inodes_count; /* Inodes count */
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358 | uint32_t s_blocks_count; /* Blocks count */
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359 | uint32_t s_r_blocks_count; /* Reserved blocks count */
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360 | uint32_t s_free_blocks_count; /* Free blocks count */
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361 | uint32_t s_free_inodes_count; /* Free inodes count */
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362 | uint32_t s_first_data_block; /* First Data Block */
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363 | uint32_t s_log_block_size; /* Block size */
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364 | int32_t s_log_frag_size; /* Fragment size */
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365 | uint32_t s_blocks_per_group; /* # Blocks per group */
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366 | uint32_t s_frags_per_group; /* # Fragments per group */
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367 | uint32_t s_inodes_per_group; /* # Inodes per group */
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368 | uint32_t s_mtime; /* Mount time */
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369 | uint32_t s_wtime; /* Write time */
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370 | uint16_t s_mnt_count; /* Mount count */
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371 | int16_t s_max_mnt_count; /* Maximal mount count */
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372 | uint16_t s_magic; /* Magic signature */
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373 | uint16_t s_state; /* File system state */
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374 | uint16_t s_errors; /* Behaviour when detecting errors */
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375 | uint16_t s_minor_rev_level; /* minor revision level */
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376 | uint32_t s_lastcheck; /* time of last check */
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377 | uint32_t s_checkinterval; /* max. time between checks */
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378 | uint32_t s_creator_os; /* OS */
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379 | uint32_t s_rev_level; /* Revision level */
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380 | uint16_t s_def_resuid; /* Default uid for reserved blocks */
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381 | uint16_t s_def_resgid; /* Default gid for reserved blocks */
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382 | /*
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383 | * These fields are for EXT2_DYNAMIC_REV superblocks only.
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384 | *
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385 | * Note: the difference between the compatible feature set and
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386 | * the incompatible feature set is that if there is a bit set
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387 | * in the incompatible feature set that the kernel doesn't
|
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388 | * know about, it should refuse to mount the filesystem.
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389 | *
|
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390 | * e2fsck's requirements are more strict; if it doesn't know
|
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391 | * about a feature in either the compatible or incompatible
|
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392 | * feature set, it must abort and not try to meddle with
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393 | * things it doesn't understand...
|
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394 | */
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395 | uint32_t s_first_ino; /* First non-reserved inode */
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396 | uint16_t s_inode_size; /* size of inode structure */
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397 | uint16_t s_block_group_nr; /* block group # of this superblock */
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398 | uint32_t s_feature_compat; /* compatible feature set */
|
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399 | uint32_t s_feature_incompat; /* incompatible feature set */
|
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400 | uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
|
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401 | uint8_t s_uuid[16]; /* 128-bit uuid for volume */
|
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402 | char s_volume_name[16]; /* volume name */
|
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403 | char s_last_mounted[64]; /* directory where last mounted */
|
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404 | uint32_t s_algorithm_usage_bitmap; /* For compression */
|
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405 | /*
|
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406 | * Performance hints. Directory preallocation should only
|
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407 | * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
|
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408 | */
|
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409 | uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
|
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410 | uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
|
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411 | uint16_t s_reserved_gdt_blocks; /* Per group table for online growth */
|
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412 | /*
|
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413 | * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
|
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414 | */
|
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415 | uint8_t s_journal_uuid[16]; /* uuid of journal superblock */
|
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416 | uint32_t s_journal_inum; /* inode number of journal file */
|
---|
417 | uint32_t s_journal_dev; /* device number of journal file */
|
---|
418 | uint32_t s_last_orphan; /* start of list of inodes to delete */
|
---|
419 | uint32_t s_hash_seed[4]; /* HTREE hash seed */
|
---|
420 | uint8_t s_def_hash_version; /* Default hash version to use */
|
---|
421 | uint8_t s_jnl_backup_type; /* Default type of journal backup */
|
---|
422 | uint16_t s_reserved_word_pad;
|
---|
423 | uint32_t s_default_mount_opts;
|
---|
424 | uint32_t s_first_meta_bg; /* First metablock group */
|
---|
425 | uint32_t s_mkfs_time; /* When the filesystem was created */
|
---|
426 | uint32_t s_jnl_blocks[17]; /* Backup of the journal inode */
|
---|
427 | uint32_t s_reserved[172]; /* Padding to the end of the block */
|
---|
428 | };
|
---|
429 |
|
---|
430 | /*
|
---|
431 | * Codes for operating systems
|
---|
432 | */
|
---|
433 | #define EXT2_OS_LINUX 0
|
---|
434 | #define EXT2_OS_HURD 1
|
---|
435 | #define EXT2_OS_MASIX 2
|
---|
436 | #define EXT2_OS_FREEBSD 3
|
---|
437 | #define EXT2_OS_LITES 4
|
---|
438 |
|
---|
439 | /*
|
---|
440 | * Revision levels
|
---|
441 | */
|
---|
442 | #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
|
---|
443 | #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
|
---|
444 |
|
---|
445 | #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
|
---|
446 | #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
|
---|
447 |
|
---|
448 | #define EXT2_GOOD_OLD_INODE_SIZE 128
|
---|
449 |
|
---|
450 | /*
|
---|
451 | * Journal inode backup types
|
---|
452 | */
|
---|
453 | #define EXT3_JNL_BACKUP_BLOCKS 1
|
---|
454 |
|
---|
455 | /*
|
---|
456 | * Feature set definitions
|
---|
457 | */
|
---|
458 |
|
---|
459 | #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
|
---|
460 | ( EXT2_SB(sb)->s_feature_compat & (mask) )
|
---|
461 | #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
|
---|
462 | ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
|
---|
463 | #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
|
---|
464 | ( EXT2_SB(sb)->s_feature_incompat & (mask) )
|
---|
465 |
|
---|
466 | #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
|
---|
467 | #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
|
---|
468 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
|
---|
469 | #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
|
---|
470 | #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
|
---|
471 | #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
|
---|
472 |
|
---|
473 | #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
|
---|
474 | #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
|
---|
475 | /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
|
---|
476 |
|
---|
477 | #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
|
---|
478 | #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
|
---|
479 | #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
|
---|
480 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
|
---|
481 | #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
|
---|
482 | #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
|
---|
483 |
|
---|
484 |
|
---|
485 | #define EXT2_FEATURE_COMPAT_SUPP 0
|
---|
486 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
|
---|
487 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
---|
488 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
|
---|
489 | EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
|
---|
490 |
|
---|
491 | /*
|
---|
492 | * Default values for user and/or group using reserved blocks
|
---|
493 | */
|
---|
494 | #define EXT2_DEF_RESUID 0
|
---|
495 | #define EXT2_DEF_RESGID 0
|
---|
496 |
|
---|
497 | /*
|
---|
498 | * Default mount options
|
---|
499 | */
|
---|
500 | #define EXT2_DEFM_DEBUG 0x0001
|
---|
501 | #define EXT2_DEFM_BSDGROUPS 0x0002
|
---|
502 | #define EXT2_DEFM_XATTR_USER 0x0004
|
---|
503 | #define EXT2_DEFM_ACL 0x0008
|
---|
504 | #define EXT2_DEFM_UID16 0x0010
|
---|
505 | #define EXT3_DEFM_JMODE 0x0060
|
---|
506 | #define EXT3_DEFM_JMODE_DATA 0x0020
|
---|
507 | #define EXT3_DEFM_JMODE_ORDERED 0x0040
|
---|
508 | #define EXT3_DEFM_JMODE_WBACK 0x0060
|
---|
509 |
|
---|
510 | /*
|
---|
511 | * Structure of a directory entry
|
---|
512 | */
|
---|
513 | #define EXT2_NAME_LEN 255
|
---|
514 |
|
---|
515 | struct ext2_dir_entry {
|
---|
516 | uint32_t inode; /* Inode number */
|
---|
517 | uint16_t rec_len; /* Directory entry length */
|
---|
518 | uint16_t name_len; /* Name length */
|
---|
519 | char name[EXT2_NAME_LEN]; /* File name */
|
---|
520 | };
|
---|
521 |
|
---|
522 | /*
|
---|
523 | * The new version of the directory entry. Since EXT2 structures are
|
---|
524 | * stored in intel byte order, and the name_len field could never be
|
---|
525 | * bigger than 255 chars, it's safe to reclaim the extra byte for the
|
---|
526 | * file_type field.
|
---|
527 | */
|
---|
528 | struct ext2_dir_entry_2 {
|
---|
529 | uint32_t inode; /* Inode number */
|
---|
530 | uint16_t rec_len; /* Directory entry length */
|
---|
531 | uint8_t name_len; /* Name length */
|
---|
532 | uint8_t file_type;
|
---|
533 | char name[EXT2_NAME_LEN]; /* File name */
|
---|
534 | };
|
---|
535 |
|
---|
536 | /*
|
---|
537 | * Ext2 directory file types. Only the low 3 bits are used. The
|
---|
538 | * other bits are reserved for now.
|
---|
539 | */
|
---|
540 | #define EXT2_FT_UNKNOWN 0
|
---|
541 | #define EXT2_FT_REG_FILE 1
|
---|
542 | #define EXT2_FT_DIR 2
|
---|
543 | #define EXT2_FT_CHRDEV 3
|
---|
544 | #define EXT2_FT_BLKDEV 4
|
---|
545 | #define EXT2_FT_FIFO 5
|
---|
546 | #define EXT2_FT_SOCK 6
|
---|
547 | #define EXT2_FT_SYMLINK 7
|
---|
548 |
|
---|
549 | #define EXT2_FT_MAX 8
|
---|
550 |
|
---|
551 | /*
|
---|
552 | * EXT2_DIR_PAD defines the directory entries boundaries
|
---|
553 | *
|
---|
554 | * NOTE: It must be a multiple of 4
|
---|
555 | */
|
---|
556 | #define EXT2_DIR_PAD 4
|
---|
557 | #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
|
---|
558 | #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
|
---|
559 | ~EXT2_DIR_ROUND)
|
---|
560 |
|
---|
561 | #endif /* _LINUX_EXT2_FS_H */
|
---|