[1765] | 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 */
|
---|
| 400 | uint32_t s_feature_ro_compat; /* readonly-compatible feature set */
|
---|
| 401 | uint8_t s_uuid[16]; /* 128-bit uuid for volume */
|
---|
| 402 | char s_volume_name[16]; /* volume name */
|
---|
| 403 | char s_last_mounted[64]; /* directory where last mounted */
|
---|
| 404 | uint32_t s_algorithm_usage_bitmap; /* For compression */
|
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| 405 | /*
|
---|
| 406 | * Performance hints. Directory preallocation should only
|
---|
| 407 | * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
|
---|
| 408 | */
|
---|
| 409 | uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
|
---|
| 410 | uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
|
---|
| 411 | uint16_t s_reserved_gdt_blocks; /* Per group table for online growth */
|
---|
| 412 | /*
|
---|
| 413 | * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
|
---|
| 414 | */
|
---|
| 415 | uint8_t s_journal_uuid[16]; /* uuid of journal superblock */
|
---|
| 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 */
|
---|