Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2fs.h
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 * 7 * $FreeBSD: releng/9.0/sys/fs/ext2fs/ext2fs.h 221126 2011-04-27 18:15:34Z jhb $ 8 */ 9 /*- 10 * Copyright (c) 2009 Aditya Sarawgi 11 * All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * 35 */ 36 37 #ifndef _FS_EXT2FS_EXT2_FS_H_ 38 #define _FS_EXT2FS_EXT2_FS_H_ 39 40 #include <sys/types.h> 41 42 /* 43 * Maximal count of links to a file 44 */ 45 #define EXT2_LINK_MAX 32000 46 47 /* 48 * Constants relative to the data blocks 49 */ 50 #define EXT2_NDIR_BLOCKS 12 51 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 52 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 53 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 54 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 55 #define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (uint32_t)) 56 57 /* 58 * The path name on which the file system is mounted is maintained 59 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in 60 * the super block for this name. 61 */ 62 #define MAXMNTLEN 512 63 64 /* 65 * Super block for an ext2fs file system. 66 */ 67 struct ext2fs { 68 uint32_t e2fs_icount; /* Inode count */ 69 uint32_t e2fs_bcount; /* blocks count */ 70 uint32_t e2fs_rbcount; /* reserved blocks count */ 71 uint32_t e2fs_fbcount; /* free blocks count */ 72 uint32_t e2fs_ficount; /* free inodes count */ 73 uint32_t e2fs_first_dblock; /* first data block */ 74 uint32_t e2fs_log_bsize; /* block size = 1024*(2^e2fs_log_bsize) */ 75 uint32_t e2fs_log_fsize; /* fragment size */ 76 uint32_t e2fs_bpg; /* blocks per group */ 77 uint32_t e2fs_fpg; /* frags per group */ 78 uint32_t e2fs_ipg; /* inodes per group */ 79 uint32_t e2fs_mtime; /* mount time */ 80 uint32_t e2fs_wtime; /* write time */ 81 uint16_t e2fs_mnt_count; /* mount count */ 82 uint16_t e2fs_max_mnt_count; /* max mount count */ 83 uint16_t e2fs_magic; /* magic number */ 84 uint16_t e2fs_state; /* file system state */ 85 uint16_t e2fs_beh; /* behavior on errors */ 86 uint16_t e2fs_minrev; /* minor revision level */ 87 uint32_t e2fs_lastfsck; /* time of last fsck */ 88 uint32_t e2fs_fsckintv; /* max time between fscks */ 89 uint32_t e2fs_creator; /* creator OS */ 90 uint32_t e2fs_rev; /* revision level */ 91 uint16_t e2fs_ruid; /* default uid for reserved blocks */ 92 uint16_t e2fs_rgid; /* default gid for reserved blocks */ 93 /* EXT2_DYNAMIC_REV superblocks */ 94 uint32_t e2fs_first_ino; /* first non-reserved inode */ 95 uint16_t e2fs_inode_size; /* size of inode structure */ 96 uint16_t e2fs_block_group_nr; /* block grp number of this sblk*/ 97 uint32_t e2fs_features_compat; /* compatible feature set */ 98 uint32_t e2fs_features_incompat; /* incompatible feature set */ 99 uint32_t e2fs_features_rocompat; /* RO-compatible feature set */ 100 uint8_t e2fs_uuid[16]; /* 128-bit uuid for volume */ 101 char e2fs_vname[16]; /* volume name */ 102 char e2fs_fsmnt[64]; /* name mounted on */ 103 uint32_t e2fs_algo; /* For compression */ 104 uint8_t e2fs_prealloc; /* # of blocks for old prealloc */ 105 uint8_t e2fs_dir_prealloc; /* # of blocks for old prealloc dirs */ 106 uint16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */ 107 char e3fs_journal_uuid[16]; /* uuid of journal superblock */ 108 uint32_t e3fs_journal_inum; /* inode number of journal file */ 109 uint32_t e3fs_journal_dev; /* device number of journal file */ 110 uint32_t e3fs_last_orphan; /* start of list of inodes to delete */ 111 uint32_t e3fs_hash_seed[4]; /* HTREE hash seed */ 112 char e3fs_def_hash_version; /* Default hash version to use */ 113 char e3fs_reserved_char_pad; 114 uint32_t e3fs_default_mount_opts; 115 uint32_t e3fs_first_meta_bg; /* First metablock block group */ 116 uint32_t reserved2[190]; /* Padding to the end of the block */ 117 }; 118 119 120 /* 121 * In-Memory Superblock 122 */ 123 124 struct m_ext2fs { 125 struct ext2fs * e2fs; 126 char e2fs_fsmnt[MAXMNTLEN];/* name mounted on */ 127 char e2fs_ronly; /* mounted read-only flag */ 128 char e2fs_fmod; /* super block modified flag */ 129 uint32_t e2fs_bsize; /* Block size */ 130 uint32_t e2fs_bshift; /* calc of logical block no */ 131 int32_t e2fs_bmask; /* calc of block offset */ 132 int32_t e2fs_bpg; /* Number of blocks per group */ 133 int64_t e2fs_qbmask; /* = s_blocksize -1 */ 134 uint32_t e2fs_fsbtodb; /* Shift to get disk block */ 135 uint32_t e2fs_ipg; /* Number of inodes per group */ 136 uint32_t e2fs_ipb; /* Number of inodes per block */ 137 uint32_t e2fs_itpg; /* Number of inode table per group */ 138 uint32_t e2fs_fsize; /* Size of fragments per block */ 139 uint32_t e2fs_fpb; /* Number of fragments per block */ 140 uint32_t e2fs_fpg; /* Number of fragments per group */ 141 uint32_t e2fs_dbpg; /* Number of descriptor blocks per group */ 142 uint32_t e2fs_descpb; /* Number of group descriptors per block */ 143 uint32_t e2fs_gdbcount; /* Number of group descriptors */ 144 uint32_t e2fs_gcount; /* Number of groups */ 145 uint32_t e2fs_first_inode;/* First inode on fs */ 146 int32_t e2fs_isize; /* Size of inode */ 147 uint32_t e2fs_mount_opt; 148 uint32_t e2fs_blocksize_bits; 149 uint32_t e2fs_total_dir; /* Total number of directories */ 150 uint8_t *e2fs_contigdirs; /* (u) # of contig. allocated dirs */ 151 char e2fs_wasvalid; /* valid at mount time */ 152 off_t e2fs_maxfilesize; 153 struct ext2_gd *e2fs_gd; /* Group Descriptors */ 154 }; 155 156 /* 157 * The second extended file system version 158 */ 159 #define E2FS_DATE "95/08/09" 160 #define E2FS_VERSION "0.5b" 161 162 /* 163 * The second extended file system magic number 164 */ 165 #define E2FS_MAGIC 0xEF53 166 167 /* 168 * Revision levels 169 */ 170 #define E2FS_REV0 0 /* The good old (original) format */ 171 #define E2FS_REV1 1 /* V2 format w/ dynamic inode sizes */ 172 173 #define E2FS_CURRENT_REV E2FS_REV0 174 #define E2FS_MAX_SUPP_REV E2FS_REV1 175 176 #define E2FS_REV0_INODE_SIZE 128 177 178 /* 179 * compatible/incompatible features 180 */ 181 #define EXT2F_COMPAT_PREALLOC 0x0001 182 #define EXT2F_COMPAT_HASJOURNAL 0x0004 183 #define EXT2F_COMPAT_RESIZE 0x0010 184 185 #define EXT2F_ROCOMPAT_SPARSESUPER 0x0001 186 #define EXT2F_ROCOMPAT_LARGEFILE 0x0002 187 #define EXT2F_ROCOMPAT_BTREE_DIR 0x0004 188 189 #define EXT2F_INCOMPAT_COMP 0x0001 190 #define EXT2F_INCOMPAT_FTYPE 0x0002 191 192 /* 193 * Features supported in this implementation 194 * 195 * We support the following REV1 features: 196 * - EXT2F_ROCOMPAT_SPARSESUPER 197 * - EXT2F_ROCOMPAT_LARGEFILE 198 * - EXT2F_INCOMPAT_FTYPE 199 */ 200 #define EXT2F_COMPAT_SUPP 0x0000 201 #define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSESUPER \ 202 | EXT2F_ROCOMPAT_LARGEFILE) 203 #define EXT2F_INCOMPAT_SUPP EXT2F_INCOMPAT_FTYPE 204 205 /* Assume that user mode programs are passing in an ext2fs superblock, not 206 * a kernel struct super_block. This will allow us to call the feature-test 207 * macros from user land. */ 208 #define EXT2_SB(sb) (sb) 209 210 /* 211 * Feature set definitions 212 */ 213 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 214 ( EXT2_SB(sb)->e2fs->e2fs_features_compat & htole32(mask) ) 215 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 216 ( EXT2_SB(sb)->e2fs->e2fs_features_rocompat & htole32(mask) ) 217 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 218 ( EXT2_SB(sb)->e2fs->e2fs_features_incompat & htole32(mask) ) 219 220 /* 221 * Definitions of behavior on errors 222 */ 223 #define E2FS_BEH_CONTINUE 1 /* continue operation */ 224 #define E2FS_BEH_READONLY 2 /* remount fs read only */ 225 #define E2FS_BEH_PANIC 3 /* cause panic */ 226 #define E2FS_BEH_DEFAULT E2FS_BEH_CONTINUE 227 228 /* 229 * OS identification 230 */ 231 #define E2FS_OS_LINUX 0 232 #define E2FS_OS_HURD 1 233 #define E2FS_OS_MASIX 2 234 #define E2FS_OS_FREEBSD 3 235 #define E2FS_OS_LITES 4 236 237 /* 238 * File clean flags 239 */ 240 #define E2FS_ISCLEAN 0x0001 /* Unmounted cleanly */ 241 #define E2FS_ERRORS 0x0002 /* Errors detected */ 242 243 /* ext2 file system block group descriptor */ 244 245 struct ext2_gd { 246 uint32_t ext2bgd_b_bitmap; /* blocks bitmap block */ 247 uint32_t ext2bgd_i_bitmap; /* inodes bitmap block */ 248 uint32_t ext2bgd_i_tables; /* inodes table block */ 249 uint16_t ext2bgd_nbfree; /* number of free blocks */ 250 uint16_t ext2bgd_nifree; /* number of free inodes */ 251 uint16_t ext2bgd_ndirs; /* number of directories */ 252 uint16_t reserved; 253 uint32_t reserved2[3]; 254 }; 255 256 /* EXT2FS metadatas are stored in little-endian byte order. These macros 257 * helps reading these metadatas 258 */ 259 260 #define e2fs_cgload(old, new, size) memcpy((new), (old), (size)); 261 #define e2fs_cgsave(old, new, size) memcpy((new), (old), (size)); 262 263 /* 264 * Macro-instructions used to manage several block sizes 265 */ 266 #define EXT2_MIN_BLOCK_SIZE 1024 267 #define EXT2_MAX_BLOCK_SIZE 4096 268 #define EXT2_MIN_BLOCK_LOG_SIZE 10 269 #if defined(_KERNEL) 270 # define EXT2_BLOCK_SIZE(s) ((s)->e2fs_bsize) 271 #else 272 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->e2fs_log_bsize) 273 #endif 274 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (uint32_t)) 275 #if defined(_KERNEL) 276 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_blocksize_bits) 277 #else 278 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_log_bsize + 10) 279 #endif 280 #if defined(_KERNEL) 281 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 282 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->e2fs_isize) 283 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->e2fs_first_inode) 284 #else 285 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == E2FS_REV0) ? \ 286 E2FS_REV0 : (s)->s_inode_size) 287 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == E2FS_REV0) ? \ 288 E2FS_REV0 : (s)->e2fs_first_ino) 289 #endif 290 291 /* 292 * Macro-instructions used to manage fragments 293 */ 294 #define EXT2_MIN_FRAG_SIZE 1024 295 #define EXT2_MAX_FRAG_SIZE 4096 296 #define EXT2_MIN_FRAG_LOG_SIZE 10 297 #if defined(_KERNEL) 298 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->e2fs_fsize) 299 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->e2fs_fpb) 300 #else 301 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->e2fs_log_fsize) 302 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 303 #endif 304 305 /* 306 * Macro-instructions used to manage group descriptors 307 */ 308 #if defined(_KERNEL) 309 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->e2fs_bpg) 310 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->e2fs_descpb) 311 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 312 #else 313 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->e2fs_bpg) 314 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_gd)) 315 316 #endif 317 318 #endif /* !_FS_EXT2FS_EXT2FS_H_ */
Cache object: fb3c9cb2f496a85163ad4bc9cc3ef00a
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]