Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 1 | /* |
| 2 | * linux/include/linux/ext2_fs.h |
| 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/include/linux/minix_fs.h |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | */ |
| 15 | |
| 16 | #ifndef _LINUX_EXT2_FS_H |
| 17 | #define _LINUX_EXT2_FS_H |
| 18 | |
Theodore Ts'o | 797f5ef | 2001-06-01 23:49:46 +0000 | [diff] [blame] | 19 | #include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 20 | |
| 21 | /* |
| 22 | * The second extended filesystem constants/structures |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * Define EXT2FS_DEBUG to produce debug messages |
| 27 | */ |
| 28 | #undef EXT2FS_DEBUG |
| 29 | |
| 30 | /* |
| 31 | * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files |
| 32 | */ |
| 33 | #define EXT2_PREALLOCATE |
| 34 | #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 |
| 35 | |
| 36 | /* |
| 37 | * The second extended file system version |
| 38 | */ |
| 39 | #define EXT2FS_DATE "95/08/09" |
| 40 | #define EXT2FS_VERSION "0.5b" |
| 41 | |
| 42 | /* |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 43 | * Special inode numbers |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 44 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 45 | #define EXT2_BAD_INO 1 /* Bad blocks inode */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 46 | #define EXT2_ROOT_INO 2 /* Root inode */ |
Aditya Kali | 0edcc27 | 2011-02-15 14:27:27 -0800 | [diff] [blame] | 47 | #define EXT4_USR_QUOTA_INO 3 /* User quota inode */ |
| 48 | #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 49 | #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| 50 | #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| 51 | #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ |
| 52 | #define EXT2_JOURNAL_INO 8 /* Journal inode */ |
Theodore Ts'o | 6d0ed67 | 2010-06-02 10:35:45 -0400 | [diff] [blame] | 53 | #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 54 | |
| 55 | /* First non-reserved inode for old ext2 filesystems */ |
| 56 | #define EXT2_GOOD_OLD_FIRST_INO 11 |
| 57 | |
| 58 | /* |
| 59 | * The second extended file system magic number |
| 60 | */ |
| 61 | #define EXT2_SUPER_MAGIC 0xEF53 |
| 62 | |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 63 | #ifdef __KERNEL__ |
| 64 | #define EXT2_SB(sb) (&((sb)->u.ext2_sb)) |
| 65 | #else |
| 66 | /* Assume that user mode programs are passing in an ext2fs superblock, not |
| 67 | * a kernel struct super_block. This will allow us to call the feature-test |
| 68 | * macros from user land. */ |
| 69 | #define EXT2_SB(sb) (sb) |
| 70 | #endif |
| 71 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 72 | /* |
| 73 | * Maximal count of links to a file |
| 74 | */ |
Theodore Ts'o | bec6f49 | 2006-11-11 09:43:42 -0500 | [diff] [blame] | 75 | #define EXT2_LINK_MAX 65000 |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 76 | |
| 77 | /* |
| 78 | * Macro-instructions used to manage several block sizes |
| 79 | */ |
Andreas Dilger | 932a489 | 2002-05-16 03:20:07 -0600 | [diff] [blame] | 80 | #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ |
Theodore Ts'o | 39dc1c4 | 2004-11-29 22:14:23 -0500 | [diff] [blame] | 81 | #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 82 | #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) |
| 83 | #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 84 | #ifdef __KERNEL__ |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 85 | #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) |
| 86 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 87 | #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 88 | #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) |
| 89 | #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 90 | #else |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 91 | #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
| 92 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 93 | #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 94 | EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 95 | #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 96 | EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 97 | #endif |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 98 | #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 99 | |
| 100 | /* |
Theodore Ts'o | 412376e | 2011-02-25 21:43:54 -0500 | [diff] [blame] | 101 | * Macro-instructions used to manage allocation clusters |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 102 | */ |
Theodore Ts'o | 412376e | 2011-02-25 21:43:54 -0500 | [diff] [blame] | 103 | #define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE |
| 104 | #define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ |
| 105 | #define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE |
| 106 | #define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) |
| 107 | #define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ |
| 108 | (s)->s_log_cluster_size) |
| 109 | #define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 110 | |
| 111 | /* |
Theodore Ts'o | 3fbfad5 | 2011-09-15 15:44:56 -0400 | [diff] [blame] | 112 | * Macro-instructions used to manage fragments |
| 113 | * |
| 114 | * Note: for backwards compatibility only, for the dump program. |
| 115 | * Ext2/3/4 will never support fragments.... |
| 116 | */ |
| 117 | #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE |
| 118 | #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE |
| 119 | #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE |
| 120 | #define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) |
| 121 | #define EXT2_FRAGS_PER_BLOCK(s) 1 |
| 122 | |
| 123 | /* |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 124 | * ACL structures |
| 125 | */ |
| 126 | struct ext2_acl_header /* Header of Access Control Lists */ |
| 127 | { |
| 128 | __u32 aclh_size; |
| 129 | __u32 aclh_file_count; |
| 130 | __u32 aclh_acle_count; |
| 131 | __u32 aclh_first_acle; |
| 132 | }; |
| 133 | |
| 134 | struct ext2_acl_entry /* Access Control List Entry */ |
| 135 | { |
| 136 | __u32 acle_size; |
| 137 | __u16 acle_perms; /* Access permissions */ |
| 138 | __u16 acle_type; /* Type of entry */ |
| 139 | __u16 acle_tag; /* User or group identity */ |
| 140 | __u16 acle_pad1; |
| 141 | __u32 acle_next; /* Pointer on next entry for the */ |
| 142 | /* same inode or on next free entry */ |
| 143 | }; |
| 144 | |
| 145 | /* |
| 146 | * Structure of a blocks group descriptor |
| 147 | */ |
| 148 | struct ext2_group_desc |
| 149 | { |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 150 | __u32 bg_block_bitmap; /* Blocks bitmap block */ |
| 151 | __u32 bg_inode_bitmap; /* Inodes bitmap block */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 152 | __u32 bg_inode_table; /* Inodes table block */ |
| 153 | __u16 bg_free_blocks_count; /* Free blocks count */ |
| 154 | __u16 bg_free_inodes_count; /* Free inodes count */ |
| 155 | __u16 bg_used_dirs_count; /* Directories count */ |
Theodore Ts'o | f5fa200 | 2006-05-08 20:17:26 -0400 | [diff] [blame] | 156 | __u16 bg_flags; |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 157 | __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
| 158 | __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ |
| 159 | __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ |
Theodore Ts'o | 8815fb8 | 2006-11-11 09:41:52 -0500 | [diff] [blame] | 160 | __u16 bg_itable_unused; /* Unused inodes count */ |
| 161 | __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 162 | }; |
| 163 | |
Valerie Aurora Henson | 3c4d4d7 | 2009-06-06 15:08:44 -0400 | [diff] [blame] | 164 | /* |
| 165 | * Structure of a blocks group descriptor |
| 166 | */ |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 167 | struct ext4_group_desc |
| 168 | { |
| 169 | __u32 bg_block_bitmap; /* Blocks bitmap block */ |
| 170 | __u32 bg_inode_bitmap; /* Inodes bitmap block */ |
| 171 | __u32 bg_inode_table; /* Inodes table block */ |
| 172 | __u16 bg_free_blocks_count; /* Free blocks count */ |
| 173 | __u16 bg_free_inodes_count; /* Free inodes count */ |
| 174 | __u16 bg_used_dirs_count; /* Directories count */ |
Valerie Aurora Henson | 3c4d4d7 | 2009-06-06 15:08:44 -0400 | [diff] [blame] | 175 | __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 176 | __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ |
| 177 | __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ |
| 178 | __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 179 | __u16 bg_itable_unused; /* Unused inodes count */ |
Valerie Aurora Henson | 3c4d4d7 | 2009-06-06 15:08:44 -0400 | [diff] [blame] | 180 | __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 181 | __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
| 182 | __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ |
| 183 | __u32 bg_inode_table_hi; /* Inodes table block MSB */ |
| 184 | __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
| 185 | __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ |
| 186 | __u16 bg_used_dirs_count_hi; /* Directories count MSB */ |
Valerie Aurora Henson | 3c4d4d7 | 2009-06-06 15:08:44 -0400 | [diff] [blame] | 187 | __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 188 | __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ |
| 189 | __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ |
| 190 | __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ |
| 191 | __u32 bg_reserved; |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 192 | }; |
| 193 | |
Theodore Ts'o | f5fa200 | 2006-05-08 20:17:26 -0400 | [diff] [blame] | 194 | #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ |
| 195 | #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ |
Jose R. Santos | ca2634a | 2007-10-21 21:03:19 -0500 | [diff] [blame] | 196 | #define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ |
Theodore Ts'o | f5fa200 | 2006-05-08 20:17:26 -0400 | [diff] [blame] | 197 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 198 | /* |
Theodore Ts'o | df614db | 2002-02-25 04:28:45 -0500 | [diff] [blame] | 199 | * Data structures used by the directory indexing feature |
| 200 | * |
| 201 | * Note: all of the multibyte integer fields are little endian. |
| 202 | */ |
| 203 | |
| 204 | /* |
| 205 | * Note: dx_root_info is laid out so that if it should somehow get |
| 206 | * overlaid by a dirent the two low bits of the hash version will be |
| 207 | * zero. Therefore, the hash version mod 4 should never be 0. |
| 208 | * Sincerely, the paranoia department. |
| 209 | */ |
| 210 | struct ext2_dx_root_info { |
| 211 | __u32 reserved_zero; |
| 212 | __u8 hash_version; /* 0 now, 1 at release */ |
| 213 | __u8 info_length; /* 8 */ |
| 214 | __u8 indirect_levels; |
| 215 | __u8 unused_flags; |
| 216 | }; |
| 217 | |
Theodore Ts'o | f77704e | 2006-11-11 22:32:35 -0500 | [diff] [blame] | 218 | #define EXT2_HASH_LEGACY 0 |
| 219 | #define EXT2_HASH_HALF_MD4 1 |
| 220 | #define EXT2_HASH_TEA 2 |
| 221 | #define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ |
| 222 | #define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ |
| 223 | #define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ |
Theodore Ts'o | 503f9e7 | 2002-06-26 16:52:10 -0400 | [diff] [blame] | 224 | |
| 225 | #define EXT2_HASH_FLAG_INCOMPAT 0x1 |
| 226 | |
Theodore Ts'o | df614db | 2002-02-25 04:28:45 -0500 | [diff] [blame] | 227 | struct ext2_dx_entry { |
| 228 | __u32 hash; |
| 229 | __u32 block; |
| 230 | }; |
| 231 | |
| 232 | struct ext2_dx_countlimit { |
| 233 | __u16 limit; |
| 234 | __u16 count; |
| 235 | }; |
| 236 | |
| 237 | |
| 238 | /* |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 239 | * Macro-instructions used to manage group descriptors |
| 240 | */ |
Valerie Clement | f2de1d3 | 2007-08-30 17:38:13 +0200 | [diff] [blame] | 241 | #define EXT2_MIN_DESC_SIZE 32 |
| 242 | #define EXT2_MIN_DESC_SIZE_64BIT 64 |
| 243 | #define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE |
| 244 | #define EXT2_DESC_SIZE(s) \ |
| 245 | ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ |
| 246 | (s)->s_desc_size : EXT2_MIN_DESC_SIZE) |
| 247 | |
Andreas Dilger | b21bf26 | 2002-06-10 11:05:56 -0600 | [diff] [blame] | 248 | #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) |
| 249 | #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) |
Theodore Ts'o | ae9e37c | 2011-06-04 16:40:26 -0400 | [diff] [blame] | 250 | #define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) |
Andreas Dilger | b21bf26 | 2002-06-10 11:05:56 -0600 | [diff] [blame] | 251 | #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) |
| 252 | /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ |
Theodore Ts'o | d32c915 | 2011-07-07 13:50:22 -0400 | [diff] [blame] | 253 | #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ |
Theodore Ts'o | ae9e37c | 2011-06-04 16:40:26 -0400 | [diff] [blame] | 254 | (EXT2_CLUSTER_SIZE(s) / \ |
| 255 | EXT2_BLOCK_SIZE(s))) |
Theodore Ts'o | d32c915 | 2011-07-07 13:50:22 -0400 | [diff] [blame] | 256 | #define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) |
| 257 | #define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ |
| 258 | EXT2_INODES_PER_BLOCK(s)) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 259 | #ifdef __KERNEL__ |
Andreas Dilger | b21bf26 | 2002-06-10 11:05:56 -0600 | [diff] [blame] | 260 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) |
| 261 | #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 262 | #else |
Valerie Clement | f2de1d3 | 2007-08-30 17:38:13 +0200 | [diff] [blame] | 263 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 264 | #endif |
| 265 | |
| 266 | /* |
| 267 | * Constants relative to the data blocks |
| 268 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 269 | #define EXT2_NDIR_BLOCKS 12 |
| 270 | #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS |
| 271 | #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) |
| 272 | #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) |
| 273 | #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 274 | |
| 275 | /* |
| 276 | * Inode flags |
| 277 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 278 | #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ |
| 279 | #define EXT2_UNRM_FL 0x00000002 /* Undelete */ |
| 280 | #define EXT2_COMPR_FL 0x00000004 /* Compress file */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 281 | #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ |
| 282 | #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| 283 | #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ |
| 284 | #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ |
| 285 | #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ |
| 286 | /* Reserved for compression usage... */ |
| 287 | #define EXT2_DIRTY_FL 0x00000100 |
| 288 | #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 289 | #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 290 | #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 291 | /* End compression flags --- maybe not all used */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 292 | #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ |
Theodore Ts'o | b10820c | 2001-05-21 05:23:31 +0000 | [diff] [blame] | 293 | #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 294 | #define EXT2_IMAGIC_FL 0x00002000 |
| 295 | #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
Theodore Ts'o | b3f5b4c | 2001-11-05 19:22:02 -0500 | [diff] [blame] | 296 | #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
Theodore Ts'o | 88372d5 | 2002-06-15 18:58:39 -0400 | [diff] [blame] | 297 | #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ |
Theodore Ts'o | 15f9011 | 2002-11-01 01:53:52 -0500 | [diff] [blame] | 298 | #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
Theodore Ts'o | 1ca1059 | 2008-04-09 11:39:11 -0400 | [diff] [blame] | 299 | #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
Andreas Dilger | 8fe81a3 | 2006-08-05 18:50:22 -0400 | [diff] [blame] | 300 | #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
Andreas Dilger | cff9690 | 2010-06-01 22:20:22 -0400 | [diff] [blame] | 301 | #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ |
Eric Sandeen | 4ffafee | 2010-02-24 11:24:37 -0500 | [diff] [blame] | 302 | #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ |
Theodore Ts'o | 6d0ed67 | 2010-06-02 10:35:45 -0400 | [diff] [blame] | 303 | #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ |
| 304 | #define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ |
| 305 | #define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 306 | #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
| 307 | |
Eric Sandeen | 4ffafee | 2010-02-24 11:24:37 -0500 | [diff] [blame] | 308 | #define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ |
| 309 | #define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 310 | |
| 311 | /* |
| 312 | * ioctl commands |
| 313 | */ |
Theodore Ts'o | bf69235 | 2006-03-17 19:45:45 -0500 | [diff] [blame] | 314 | |
| 315 | /* Used for online resize */ |
| 316 | struct ext2_new_group_input { |
| 317 | __u32 group; /* Group number for this data */ |
| 318 | __u32 block_bitmap; /* Absolute block number of block bitmap */ |
| 319 | __u32 inode_bitmap; /* Absolute block number of inode bitmap */ |
| 320 | __u32 inode_table; /* Absolute block number of inode table start */ |
| 321 | __u32 blocks_count; /* Total number of blocks in this group */ |
| 322 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ |
| 323 | __u16 unused; /* Number of reserved GDT blocks in group */ |
| 324 | }; |
| 325 | |
Theodore Ts'o | 5c4f8d6 | 2008-06-07 13:13:16 -0400 | [diff] [blame] | 326 | struct ext4_new_group_input { |
| 327 | __u32 group; /* Group number for this data */ |
| 328 | __u64 block_bitmap; /* Absolute block number of block bitmap */ |
| 329 | __u64 inode_bitmap; /* Absolute block number of inode bitmap */ |
| 330 | __u64 inode_table; /* Absolute block number of inode table start */ |
| 331 | __u32 blocks_count; /* Total number of blocks in this group */ |
| 332 | __u16 reserved_blocks; /* Number of reserved blocks in this group */ |
| 333 | __u16 unused; |
| 334 | }; |
| 335 | |
Theodore Ts'o | 3166c58 | 2007-12-17 23:03:53 -0500 | [diff] [blame] | 336 | #ifdef __GNU__ /* Needed for the Hurd */ |
| 337 | #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) |
| 338 | #endif |
| 339 | |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 340 | #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) |
| 341 | #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) |
| 342 | #define EXT2_IOC_GETVERSION _IOR('v', 1, long) |
| 343 | #define EXT2_IOC_SETVERSION _IOW('v', 2, long) |
Theodore Ts'o | bf69235 | 2006-03-17 19:45:45 -0500 | [diff] [blame] | 344 | #define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) |
| 345 | #define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) |
| 346 | #define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) |
| 347 | #define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) |
Theodore Ts'o | 5c4f8d6 | 2008-06-07 13:13:16 -0400 | [diff] [blame] | 348 | #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) |
Yongqiang Yang | 9f6ba88 | 2011-09-14 11:55:59 -0400 | [diff] [blame] | 349 | #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 350 | |
| 351 | /* |
| 352 | * Structure of an inode on the disk |
| 353 | */ |
| 354 | struct ext2_inode { |
| 355 | __u16 i_mode; /* File mode */ |
| 356 | __u16 i_uid; /* Low 16 bits of Owner Uid */ |
| 357 | __u32 i_size; /* Size in bytes */ |
| 358 | __u32 i_atime; /* Access time */ |
Theodore Ts'o | 6b3ce98 | 2006-11-11 09:45:22 -0500 | [diff] [blame] | 359 | __u32 i_ctime; /* Inode change time */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 360 | __u32 i_mtime; /* Modification time */ |
| 361 | __u32 i_dtime; /* Deletion Time */ |
| 362 | __u16 i_gid; /* Low 16 bits of Group Id */ |
| 363 | __u16 i_links_count; /* Links count */ |
| 364 | __u32 i_blocks; /* Blocks count */ |
| 365 | __u32 i_flags; /* File flags */ |
| 366 | union { |
| 367 | struct { |
Theodore Ts'o | d362a3f | 2007-04-19 01:53:53 -0400 | [diff] [blame] | 368 | __u32 l_i_version; /* was l_i_reserved1 */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 369 | } linux1; |
| 370 | struct { |
| 371 | __u32 h_i_translator; |
| 372 | } hurd1; |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 373 | } osd1; /* OS dependent 1 */ |
| 374 | __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
| 375 | __u32 i_generation; /* File version (for NFS) */ |
| 376 | __u32 i_file_acl; /* File ACL */ |
Valerie Aurora Henson | a63745e | 2009-09-07 22:29:45 -0400 | [diff] [blame] | 377 | __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 378 | __u32 i_faddr; /* Fragment address */ |
| 379 | union { |
| 380 | struct { |
Theodore Ts'o | 5d17119 | 2006-11-11 06:32:03 -0500 | [diff] [blame] | 381 | __u16 l_i_blocks_hi; |
Theodore Ts'o | bb767b2 | 2008-05-15 22:14:52 -0400 | [diff] [blame] | 382 | __u16 l_i_file_acl_high; |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 383 | __u16 l_i_uid_high; /* these 2 fields */ |
| 384 | __u16 l_i_gid_high; /* were reserved2[0] */ |
Theodore Ts'o | ae96c67 | 2011-09-16 17:51:03 -0400 | [diff] [blame^] | 385 | __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ |
| 386 | __u16 l_i_reserved; |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 387 | } linux2; |
| 388 | struct { |
| 389 | __u8 h_i_frag; /* Fragment number */ |
| 390 | __u8 h_i_fsize; /* Fragment size */ |
| 391 | __u16 h_i_mode_high; |
| 392 | __u16 h_i_uid_high; |
| 393 | __u16 h_i_gid_high; |
| 394 | __u32 h_i_author; |
| 395 | } hurd2; |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 396 | } osd2; /* OS dependent 2 */ |
| 397 | }; |
| 398 | |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 399 | /* |
| 400 | * Permanent part of an large inode on the disk |
| 401 | */ |
| 402 | struct ext2_inode_large { |
| 403 | __u16 i_mode; /* File mode */ |
| 404 | __u16 i_uid; /* Low 16 bits of Owner Uid */ |
| 405 | __u32 i_size; /* Size in bytes */ |
| 406 | __u32 i_atime; /* Access time */ |
Theodore Ts'o | 6b3ce98 | 2006-11-11 09:45:22 -0500 | [diff] [blame] | 407 | __u32 i_ctime; /* Inode Change time */ |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 408 | __u32 i_mtime; /* Modification time */ |
| 409 | __u32 i_dtime; /* Deletion Time */ |
| 410 | __u16 i_gid; /* Low 16 bits of Group Id */ |
| 411 | __u16 i_links_count; /* Links count */ |
| 412 | __u32 i_blocks; /* Blocks count */ |
| 413 | __u32 i_flags; /* File flags */ |
| 414 | union { |
| 415 | struct { |
Theodore Ts'o | d362a3f | 2007-04-19 01:53:53 -0400 | [diff] [blame] | 416 | __u32 l_i_version; /* was l_i_reserved1 */ |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 417 | } linux1; |
| 418 | struct { |
| 419 | __u32 h_i_translator; |
| 420 | } hurd1; |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 421 | } osd1; /* OS dependent 1 */ |
| 422 | __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
| 423 | __u32 i_generation; /* File version (for NFS) */ |
| 424 | __u32 i_file_acl; /* File ACL */ |
Valerie Aurora Henson | a63745e | 2009-09-07 22:29:45 -0400 | [diff] [blame] | 425 | __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 426 | __u32 i_faddr; /* Fragment address */ |
| 427 | union { |
| 428 | struct { |
Theodore Ts'o | 5d17119 | 2006-11-11 06:32:03 -0500 | [diff] [blame] | 429 | __u16 l_i_blocks_hi; |
Theodore Ts'o | bb767b2 | 2008-05-15 22:14:52 -0400 | [diff] [blame] | 430 | __u16 l_i_file_acl_high; |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 431 | __u16 l_i_uid_high; /* these 2 fields */ |
| 432 | __u16 l_i_gid_high; /* were reserved2[0] */ |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 433 | __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ |
| 434 | __u16 l_i_reserved; |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 435 | } linux2; |
| 436 | struct { |
| 437 | __u8 h_i_frag; /* Fragment number */ |
| 438 | __u8 h_i_fsize; /* Fragment size */ |
| 439 | __u16 h_i_mode_high; |
| 440 | __u16 h_i_uid_high; |
| 441 | __u16 h_i_gid_high; |
| 442 | __u32 h_i_author; |
| 443 | } hurd2; |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 444 | } osd2; /* OS dependent 2 */ |
| 445 | __u16 i_extra_isize; |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 446 | __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ |
Theodore Ts'o | 6b3ce98 | 2006-11-11 09:45:22 -0500 | [diff] [blame] | 447 | __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ |
| 448 | __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ |
| 449 | __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ |
| 450 | __u32 i_crtime; /* File creation time */ |
| 451 | __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ |
Theodore Ts'o | bb767b2 | 2008-05-15 22:14:52 -0400 | [diff] [blame] | 452 | __u32 i_version_hi; /* high 32 bits for 64-bit version */ |
Theodore Ts'o | 7331196 | 2005-01-25 23:42:56 -0500 | [diff] [blame] | 453 | }; |
| 454 | |
Valerie Aurora Henson | a63745e | 2009-09-07 22:29:45 -0400 | [diff] [blame] | 455 | #define i_dir_acl i_size_high |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 456 | |
| 457 | #if defined(__KERNEL__) || defined(__linux__) |
| 458 | #define i_reserved1 osd1.linux1.l_i_reserved1 |
| 459 | #define i_frag osd2.linux2.l_i_frag |
| 460 | #define i_fsize osd2.linux2.l_i_fsize |
| 461 | #define i_uid_low i_uid |
| 462 | #define i_gid_low i_gid |
| 463 | #define i_uid_high osd2.linux2.l_i_uid_high |
| 464 | #define i_gid_high osd2.linux2.l_i_gid_high |
Theodore Ts'o | 48e6e81 | 2003-07-06 00:36:48 -0400 | [diff] [blame] | 465 | #else |
| 466 | #if defined(__GNU__) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 467 | |
| 468 | #define i_translator osd1.hurd1.h_i_translator |
| 469 | #define i_frag osd2.hurd2.h_i_frag; |
| 470 | #define i_fsize osd2.hurd2.h_i_fsize; |
| 471 | #define i_uid_high osd2.hurd2.h_i_uid_high |
| 472 | #define i_gid_high osd2.hurd2.h_i_gid_high |
| 473 | #define i_author osd2.hurd2.h_i_author |
| 474 | |
Theodore Ts'o | 48e6e81 | 2003-07-06 00:36:48 -0400 | [diff] [blame] | 475 | #endif /* __GNU__ */ |
Andreas Dilger | 7da78ff | 2002-06-09 17:38:50 -0600 | [diff] [blame] | 476 | #endif /* defined(__KERNEL__) || defined(__linux__) */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 477 | |
Theodore Ts'o | 7132d48 | 2008-01-01 12:25:36 -0500 | [diff] [blame] | 478 | #define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) |
| 479 | #define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) |
Theodore Ts'o | 1534392 | 2008-01-21 09:45:25 -0500 | [diff] [blame] | 480 | #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) |
| 481 | #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) |
Theodore Ts'o | 3306861 | 2007-12-30 11:05:39 -0500 | [diff] [blame] | 482 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 483 | /* |
| 484 | * File system states |
| 485 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 486 | #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ |
| 487 | #define EXT2_ERROR_FS 0x0002 /* Errors detected */ |
Theodore Ts'o | a80f369 | 2008-03-15 01:25:51 -0400 | [diff] [blame] | 488 | #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 489 | |
| 490 | /* |
Theodore Ts'o | f77704e | 2006-11-11 22:32:35 -0500 | [diff] [blame] | 491 | * Misc. filesystem flags |
| 492 | */ |
| 493 | #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ |
| 494 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ |
Theodore Ts'o | 6cb2740 | 2008-01-26 19:06:35 -0500 | [diff] [blame] | 495 | #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ |
Theodore Ts'o | 6d0ed67 | 2010-06-02 10:35:45 -0400 | [diff] [blame] | 496 | #define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ |
| 497 | #define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ |
| 498 | #define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ |
Theodore Ts'o | f77704e | 2006-11-11 22:32:35 -0500 | [diff] [blame] | 499 | |
| 500 | /* |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 501 | * Mount flags |
| 502 | */ |
| 503 | #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ |
| 504 | #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ |
| 505 | #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ |
| 506 | #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ |
| 507 | #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ |
| 508 | #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ |
| 509 | #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ |
| 510 | #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ |
| 511 | |
| 512 | #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt |
| 513 | #define set_opt(o, opt) o |= EXT2_MOUNT_##opt |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 514 | #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 515 | EXT2_MOUNT_##opt) |
| 516 | /* |
| 517 | * Maximal mount counts between two filesystem checks |
| 518 | */ |
| 519 | #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
| 520 | #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
| 521 | |
| 522 | /* |
| 523 | * Behaviour when detecting errors |
| 524 | */ |
| 525 | #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ |
| 526 | #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ |
| 527 | #define EXT2_ERRORS_PANIC 3 /* Panic */ |
| 528 | #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE |
| 529 | |
Theodore Ts'o | 993988f | 2010-06-25 10:53:13 -0400 | [diff] [blame] | 530 | #if (__GNUC__ >= 4) |
| 531 | #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) |
| 532 | #else |
| 533 | #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
| 534 | #endif |
| 535 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 536 | /* |
| 537 | * Structure of the super block |
| 538 | */ |
| 539 | struct ext2_super_block { |
| 540 | __u32 s_inodes_count; /* Inodes count */ |
| 541 | __u32 s_blocks_count; /* Blocks count */ |
| 542 | __u32 s_r_blocks_count; /* Reserved blocks count */ |
| 543 | __u32 s_free_blocks_count; /* Free blocks count */ |
| 544 | __u32 s_free_inodes_count; /* Free inodes count */ |
| 545 | __u32 s_first_data_block; /* First Data Block */ |
| 546 | __u32 s_log_block_size; /* Block size */ |
Theodore Ts'o | 4df1618 | 2011-03-18 14:47:15 -0400 | [diff] [blame] | 547 | __u32 s_log_cluster_size; /* Allocation cluster size */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 548 | __u32 s_blocks_per_group; /* # Blocks per group */ |
Theodore Ts'o | 412376e | 2011-02-25 21:43:54 -0500 | [diff] [blame] | 549 | __u32 s_clusters_per_group; /* # Fragments per group */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 550 | __u32 s_inodes_per_group; /* # Inodes per group */ |
| 551 | __u32 s_mtime; /* Mount time */ |
| 552 | __u32 s_wtime; /* Write time */ |
| 553 | __u16 s_mnt_count; /* Mount count */ |
| 554 | __s16 s_max_mnt_count; /* Maximal mount count */ |
| 555 | __u16 s_magic; /* Magic signature */ |
| 556 | __u16 s_state; /* File system state */ |
| 557 | __u16 s_errors; /* Behaviour when detecting errors */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 558 | __u16 s_minor_rev_level; /* minor revision level */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 559 | __u32 s_lastcheck; /* time of last check */ |
| 560 | __u32 s_checkinterval; /* max. time between checks */ |
| 561 | __u32 s_creator_os; /* OS */ |
| 562 | __u32 s_rev_level; /* Revision level */ |
| 563 | __u16 s_def_resuid; /* Default uid for reserved blocks */ |
| 564 | __u16 s_def_resgid; /* Default gid for reserved blocks */ |
| 565 | /* |
| 566 | * These fields are for EXT2_DYNAMIC_REV superblocks only. |
| 567 | * |
| 568 | * Note: the difference between the compatible feature set and |
| 569 | * the incompatible feature set is that if there is a bit set |
| 570 | * in the incompatible feature set that the kernel doesn't |
| 571 | * know about, it should refuse to mount the filesystem. |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 572 | * |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 573 | * e2fsck's requirements are more strict; if it doesn't know |
| 574 | * about a feature in either the compatible or incompatible |
| 575 | * feature set, it must abort and not try to meddle with |
| 576 | * things it doesn't understand... |
| 577 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 578 | __u32 s_first_ino; /* First non-reserved inode */ |
| 579 | __u16 s_inode_size; /* size of inode structure */ |
| 580 | __u16 s_block_group_nr; /* block group # of this superblock */ |
| 581 | __u32 s_feature_compat; /* compatible feature set */ |
| 582 | __u32 s_feature_incompat; /* incompatible feature set */ |
| 583 | __u32 s_feature_ro_compat; /* readonly-compatible feature set */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 584 | __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 585 | char s_volume_name[16]; /* volume name */ |
| 586 | char s_last_mounted[64]; /* directory where last mounted */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 587 | __u32 s_algorithm_usage_bitmap; /* For compression */ |
| 588 | /* |
| 589 | * Performance hints. Directory preallocation should only |
| 590 | * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. |
| 591 | */ |
| 592 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
| 593 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
Theodore Ts'o | 9e6c5dd | 2002-07-09 11:08:10 -0400 | [diff] [blame] | 594 | __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 595 | /* |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 596 | * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. |
| 597 | */ |
| 598 | __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
| 599 | __u32 s_journal_inum; /* inode number of journal file */ |
| 600 | __u32 s_journal_dev; /* device number of journal file */ |
| 601 | __u32 s_last_orphan; /* start of list of inodes to delete */ |
Theodore Ts'o | b7a0056 | 2002-07-20 00:28:07 -0400 | [diff] [blame] | 602 | __u32 s_hash_seed[4]; /* HTREE hash seed */ |
| 603 | __u8 s_def_hash_version; /* Default hash version to use */ |
Theodore Ts'o | a435ec3 | 2003-08-21 00:40:26 -0400 | [diff] [blame] | 604 | __u8 s_jnl_backup_type; /* Default type of journal backup */ |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 605 | __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ |
Theodore Ts'o | a0c3fd5 | 2002-10-15 17:43:43 -0400 | [diff] [blame] | 606 | __u32 s_default_mount_opts; |
Theodore Ts'o | c046ac7 | 2002-10-20 00:38:57 -0400 | [diff] [blame] | 607 | __u32 s_first_meta_bg; /* First metablock group */ |
Theodore Ts'o | 9d2aefb | 2002-10-25 17:29:55 -0400 | [diff] [blame] | 608 | __u32 s_mkfs_time; /* When the filesystem was created */ |
Theodore Ts'o | 1ba7a2f | 2004-01-30 01:48:06 -0500 | [diff] [blame] | 609 | __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 610 | __u32 s_blocks_count_hi; /* Blocks count high 32bits */ |
| 611 | __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ |
| 612 | __u32 s_free_blocks_hi; /* Free blocks count */ |
Theodore Ts'o | 6b3ce98 | 2006-11-11 09:45:22 -0500 | [diff] [blame] | 613 | __u16 s_min_extra_isize; /* All inodes have at least # bytes */ |
| 614 | __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ |
Theodore Ts'o | f77704e | 2006-11-11 22:32:35 -0500 | [diff] [blame] | 615 | __u32 s_flags; /* Miscellaneous flags */ |
Theodore Ts'o | 96c6a3a | 2007-05-18 22:06:53 -0400 | [diff] [blame] | 616 | __u16 s_raid_stride; /* RAID stride */ |
Andreas Dilger | b62e88a | 2007-05-31 12:25:46 -0400 | [diff] [blame] | 617 | __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ |
| 618 | __u64 s_mmp_block; /* Block for multi-mount protection */ |
Theodore Ts'o | decb2a5 | 2007-05-31 12:30:09 -0400 | [diff] [blame] | 619 | __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ |
Theodore Ts'o | 494a1da | 2008-04-22 07:47:25 -0400 | [diff] [blame] | 620 | __u8 s_log_groups_per_flex; /* FLEX_BG group size */ |
| 621 | __u8 s_reserved_char_pad; |
| 622 | __u16 s_reserved_pad; /* Padding to next 32bits */ |
Theodore Ts'o | b7c5b40 | 2009-03-05 19:40:20 -0500 | [diff] [blame] | 623 | __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
Theodore Ts'o | 6d0ed67 | 2010-06-02 10:35:45 -0400 | [diff] [blame] | 624 | __u32 s_snapshot_inum; /* Inode number of active snapshot */ |
| 625 | __u32 s_snapshot_id; /* sequential ID of active snapshot */ |
| 626 | __u64 s_snapshot_r_blocks_count; /* reserved blocks for active |
| 627 | snapshot's future use */ |
| 628 | __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ |
Theodore Ts'o | 993988f | 2010-06-25 10:53:13 -0400 | [diff] [blame] | 629 | #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) |
| 630 | __u32 s_error_count; /* number of fs errors */ |
| 631 | __u32 s_first_error_time; /* first time an error happened */ |
| 632 | __u32 s_first_error_ino; /* inode involved in first error */ |
| 633 | __u64 s_first_error_block; /* block involved of first error */ |
| 634 | __u8 s_first_error_func[32]; /* function where the error happened */ |
| 635 | __u32 s_first_error_line; /* line number where error happened */ |
| 636 | __u32 s_last_error_time; /* most recent time of an error */ |
| 637 | __u32 s_last_error_ino; /* inode involved in last error */ |
| 638 | __u32 s_last_error_line; /* line number where error happened */ |
| 639 | __u64 s_last_error_block; /* block involved of last error */ |
| 640 | __u8 s_last_error_func[32]; /* function where the error happened */ |
Theodore Ts'o | 9345f02 | 2010-09-18 19:38:22 -0400 | [diff] [blame] | 641 | #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) |
| 642 | __u8 s_mount_opts[64]; |
Aditya Kali | 0edcc27 | 2011-02-15 14:27:27 -0800 | [diff] [blame] | 643 | __u32 s_usr_quota_inum; /* inode number of user quota file */ |
| 644 | __u32 s_grp_quota_inum; /* inode number of group quota file */ |
Theodore Ts'o | 4df1618 | 2011-03-18 14:47:15 -0400 | [diff] [blame] | 645 | __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 646 | __u32 s_reserved[108]; /* Padding to the end of the block */ |
Theodore Ts'o | 16c581d | 2011-09-15 13:38:41 -0400 | [diff] [blame] | 647 | __u32 s_checksum; /* crc32c(superblock) */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 648 | }; |
| 649 | |
Theodore Ts'o | 993988f | 2010-06-25 10:53:13 -0400 | [diff] [blame] | 650 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) |
| 651 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 652 | /* |
| 653 | * Codes for operating systems |
| 654 | */ |
| 655 | #define EXT2_OS_LINUX 0 |
| 656 | #define EXT2_OS_HURD 1 |
Coly Li | c9548bc | 2007-08-23 15:08:30 +0800 | [diff] [blame] | 657 | #define EXT2_OBSO_OS_MASIX 2 |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 658 | #define EXT2_OS_FREEBSD 3 |
| 659 | #define EXT2_OS_LITES 4 |
| 660 | |
| 661 | /* |
| 662 | * Revision levels |
| 663 | */ |
| 664 | #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 665 | #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 666 | |
| 667 | #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV |
| 668 | #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV |
| 669 | |
| 670 | #define EXT2_GOOD_OLD_INODE_SIZE 128 |
| 671 | |
| 672 | /* |
Theodore Ts'o | a435ec3 | 2003-08-21 00:40:26 -0400 | [diff] [blame] | 673 | * Journal inode backup types |
| 674 | */ |
| 675 | #define EXT3_JNL_BACKUP_BLOCKS 1 |
| 676 | |
| 677 | /* |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 678 | * Feature set definitions |
| 679 | */ |
| 680 | |
| 681 | #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ |
| 682 | ( EXT2_SB(sb)->s_feature_compat & (mask) ) |
| 683 | #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
| 684 | ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) |
| 685 | #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ |
| 686 | ( EXT2_SB(sb)->s_feature_incompat & (mask) ) |
| 687 | |
| 688 | #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
| 689 | #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
| 690 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
Theodore Ts'o | b10820c | 2001-05-21 05:23:31 +0000 | [diff] [blame] | 691 | #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 692 | #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 |
Theodore Ts'o | b10820c | 2001-05-21 05:23:31 +0000 | [diff] [blame] | 693 | #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 |
Theodore Ts'o | f5fa200 | 2006-05-08 20:17:26 -0400 | [diff] [blame] | 694 | #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 695 | /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ |
| 696 | #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 |
| 697 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 698 | |
| 699 | #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
| 700 | #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
Theodore Ts'o | 2c93113 | 2003-04-11 13:26:21 -0400 | [diff] [blame] | 701 | /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ |
Theodore Ts'o | 5d17119 | 2006-11-11 06:32:03 -0500 | [diff] [blame] | 702 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 |
Theodore Ts'o | 8815fb8 | 2006-11-11 09:41:52 -0500 | [diff] [blame] | 703 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 |
Theodore Ts'o | bec6f49 | 2006-11-11 09:43:42 -0500 | [diff] [blame] | 704 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 |
Theodore Ts'o | 6b3ce98 | 2006-11-11 09:45:22 -0500 | [diff] [blame] | 705 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 |
Theodore Ts'o | 6d0ed67 | 2010-06-02 10:35:45 -0400 | [diff] [blame] | 706 | #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 |
Aditya Kali | 0edcc27 | 2011-02-15 14:27:27 -0800 | [diff] [blame] | 707 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 |
Theodore Ts'o | 412376e | 2011-02-25 21:43:54 -0500 | [diff] [blame] | 708 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 |
Theodore Ts'o | 89efc88 | 2011-09-15 10:38:55 -0400 | [diff] [blame] | 709 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 710 | |
| 711 | #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
| 712 | #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 |
| 713 | #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ |
| 714 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ |
Theodore Ts'o | c046ac7 | 2002-10-20 00:38:57 -0400 | [diff] [blame] | 715 | #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 |
Theodore Ts'o | 39dc1c4 | 2004-11-29 22:14:23 -0500 | [diff] [blame] | 716 | #define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 |
Theodore Ts'o | 8061d2c | 2006-11-11 09:44:47 -0500 | [diff] [blame] | 717 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
Andreas Dilger | b62e88a | 2007-05-31 12:25:46 -0400 | [diff] [blame] | 718 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 |
Jose R. Santos | cf0eeec | 2007-08-13 23:32:51 -0500 | [diff] [blame] | 719 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 |
Andreas Dilger | cff9690 | 2010-06-01 22:20:22 -0400 | [diff] [blame] | 720 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 |
Andreas Dilger | 30a7610 | 2010-06-01 22:21:42 -0400 | [diff] [blame] | 721 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 |
Theodore Ts'o | 39dc1c4 | 2004-11-29 22:14:23 -0500 | [diff] [blame] | 722 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 723 | #define EXT2_FEATURE_COMPAT_SUPP 0 |
Theodore Ts'o | c046ac7 | 2002-10-20 00:38:57 -0400 | [diff] [blame] | 724 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 725 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
| 726 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ |
Andreas Dilger | a7c9cb7 | 2008-02-02 01:25:03 -0700 | [diff] [blame] | 727 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 728 | EXT2_FEATURE_RO_COMPAT_BTREE_DIR) |
| 729 | |
| 730 | /* |
| 731 | * Default values for user and/or group using reserved blocks |
| 732 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 733 | #define EXT2_DEF_RESUID 0 |
| 734 | #define EXT2_DEF_RESGID 0 |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 735 | |
| 736 | /* |
Theodore Ts'o | a0c3fd5 | 2002-10-15 17:43:43 -0400 | [diff] [blame] | 737 | * Default mount options |
| 738 | */ |
| 739 | #define EXT2_DEFM_DEBUG 0x0001 |
| 740 | #define EXT2_DEFM_BSDGROUPS 0x0002 |
| 741 | #define EXT2_DEFM_XATTR_USER 0x0004 |
| 742 | #define EXT2_DEFM_ACL 0x0008 |
| 743 | #define EXT2_DEFM_UID16 0x0010 |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 744 | #define EXT3_DEFM_JMODE 0x0060 |
Theodore Ts'o | 4a959fe | 2002-10-20 01:52:52 -0400 | [diff] [blame] | 745 | #define EXT3_DEFM_JMODE_DATA 0x0020 |
| 746 | #define EXT3_DEFM_JMODE_ORDERED 0x0040 |
| 747 | #define EXT3_DEFM_JMODE_WBACK 0x0060 |
Theodore Ts'o | 9345f02 | 2010-09-18 19:38:22 -0400 | [diff] [blame] | 748 | #define EXT4_DEFM_NOBARRIER 0x0100 |
| 749 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200 |
| 750 | #define EXT4_DEFM_DISCARD 0x0400 |
| 751 | #define EXT4_DEFM_NODELALLOC 0x0800 |
Theodore Ts'o | a0c3fd5 | 2002-10-15 17:43:43 -0400 | [diff] [blame] | 752 | |
| 753 | /* |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 754 | * Structure of a directory entry |
| 755 | */ |
| 756 | #define EXT2_NAME_LEN 255 |
| 757 | |
| 758 | struct ext2_dir_entry { |
| 759 | __u32 inode; /* Inode number */ |
| 760 | __u16 rec_len; /* Directory entry length */ |
| 761 | __u16 name_len; /* Name length */ |
| 762 | char name[EXT2_NAME_LEN]; /* File name */ |
| 763 | }; |
| 764 | |
| 765 | /* |
| 766 | * The new version of the directory entry. Since EXT2 structures are |
| 767 | * stored in intel byte order, and the name_len field could never be |
| 768 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
| 769 | * file_type field. |
| 770 | */ |
| 771 | struct ext2_dir_entry_2 { |
| 772 | __u32 inode; /* Inode number */ |
| 773 | __u16 rec_len; /* Directory entry length */ |
| 774 | __u8 name_len; /* Name length */ |
| 775 | __u8 file_type; |
| 776 | char name[EXT2_NAME_LEN]; /* File name */ |
| 777 | }; |
| 778 | |
| 779 | /* |
| 780 | * Ext2 directory file types. Only the low 3 bits are used. The |
| 781 | * other bits are reserved for now. |
| 782 | */ |
| 783 | #define EXT2_FT_UNKNOWN 0 |
| 784 | #define EXT2_FT_REG_FILE 1 |
| 785 | #define EXT2_FT_DIR 2 |
| 786 | #define EXT2_FT_CHRDEV 3 |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 787 | #define EXT2_FT_BLKDEV 4 |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 788 | #define EXT2_FT_FIFO 5 |
| 789 | #define EXT2_FT_SOCK 6 |
| 790 | #define EXT2_FT_SYMLINK 7 |
| 791 | |
| 792 | #define EXT2_FT_MAX 8 |
| 793 | |
| 794 | /* |
| 795 | * EXT2_DIR_PAD defines the directory entries boundaries |
| 796 | * |
| 797 | * NOTE: It must be a multiple of 4 |
| 798 | */ |
Andreas Dilger | 0fbd1a8 | 2002-05-23 00:32:34 -0600 | [diff] [blame] | 799 | #define EXT2_DIR_PAD 4 |
| 800 | #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 801 | #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ |
| 802 | ~EXT2_DIR_ROUND) |
| 803 | |
Andreas Dilger | b62e88a | 2007-05-31 12:25:46 -0400 | [diff] [blame] | 804 | /* |
| 805 | * This structure will be used for multiple mount protection. It will be |
| 806 | * written into the block number saved in the s_mmp_block field in the |
| 807 | * superblock. |
| 808 | */ |
| 809 | #define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ |
| 810 | #define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ |
| 811 | #define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ |
| 812 | |
| 813 | struct mmp_struct { |
| 814 | __u32 mmp_magic; |
| 815 | __u32 mmp_seq; |
| 816 | __u64 mmp_time; |
| 817 | char mmp_nodename[64]; |
| 818 | char mmp_bdevname[32]; |
| 819 | __u16 mmp_interval; |
| 820 | __u16 mmp_pad1; |
| 821 | __u32 mmp_pad2; |
| 822 | }; |
| 823 | |
| 824 | /* |
| 825 | * Interval in number of seconds to update the MMP sequence number. |
| 826 | */ |
| 827 | #define EXT2_MMP_DEF_INTERVAL 5 |
| 828 | |
Theodore Ts'o | 9f8046f | 2001-05-14 11:35:52 +0000 | [diff] [blame] | 829 | #endif /* _LINUX_EXT2_FS_H */ |