ext2_fs.h revision 4a959fe6f18a3b6023234a66f4455f7ec660b8b4
19f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 29f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * linux/include/linux/ext2_fs.h 39f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 49f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Copyright (C) 1992, 1993, 1994, 1995 59f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Remy Card (card@masi.ibp.fr) 69f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Laboratoire MASI - Institut Blaise Pascal 79f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Universite Pierre et Marie Curie (Paris VI) 89f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 99f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * from 109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * linux/include/linux/minix_fs.h 129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Copyright (C) 1991, 1992 Linus Torvalds 149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifndef _LINUX_EXT2_FS_H 179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define _LINUX_EXT2_FS_H 189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 19797f5ef14e92294b329e52971d467d7af5b2993eTheodore Ts'o#include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ 209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended filesystem constants/structures 239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Define EXT2FS_DEBUG to produce debug messages 279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#undef EXT2FS_DEBUG 299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_PREALLOCATE 349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DEFAULT_PREALLOC_BLOCKS 8 359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended file system version 389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2FS_DATE "95/08/09" 409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2FS_VERSION "0.5b" 419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 430fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * Special inode numbers 449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_BAD_INO 1 /* Bad blocks inode */ 469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ROOT_INO 2 /* Root inode */ 479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ACL_IDX_INO 3 /* ACL inode */ 489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ACL_DATA_INO 4 /* ACL inode */ 499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_JOURNAL_INO 8 /* Journal inode */ 539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* First non-reserved inode for old ext2 filesystems */ 559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_FIRST_INO 11 569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended file system magic number 599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SUPER_MAGIC 0xEF53 619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 620fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#ifdef __KERNEL__ 630fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 640fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#else 650fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* Assume that user mode programs are passing in an ext2fs superblock, not 660fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * a kernel struct super_block. This will allow us to call the feature-test 670fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * macros from user land. */ 680fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SB(sb) (sb) 690fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#endif 700fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger 719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal count of links to a file 739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_LINK_MAX 32000 759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage several block sizes 789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 79932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 80932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MAX_BLOCK_LOG_SIZE 13 /* 8192 */ 817da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 827da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 847da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 857da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 860fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 877da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 887da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 907da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 917da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 937da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 957da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 977da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 1009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage fragments 1019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 102932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 1030fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 104932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 1059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 1060fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 1070fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 1089f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 1099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 1109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 1119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 1129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 1149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ACL structures 1159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 1169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_acl_header /* Header of Access Control Lists */ 1179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{ 1189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_size; 1199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_file_count; 1209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_acle_count; 1219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_first_acle; 1229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_acl_entry /* Access Control List Entry */ 1259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{ 1269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 acle_size; 1279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_perms; /* Access permissions */ 1289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_type; /* Type of entry */ 1299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_tag; /* User or group identity */ 1309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_pad1; 1319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 acle_next; /* Pointer on next entry for the */ 1329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* same inode or on next free entry */ 1339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 1369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of a blocks group descriptor 1379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 1389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_group_desc 1399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{ 1409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 bg_block_bitmap; /* Blocks bitmap block */ 1419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 bg_inode_bitmap; /* Inodes bitmap block */ 1429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 bg_inode_table; /* Inodes table block */ 1439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_free_blocks_count; /* Free blocks count */ 1449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_free_inodes_count; /* Free inodes count */ 1459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_used_dirs_count; /* Directories count */ 1469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_pad; 1479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 bg_reserved[3]; 1489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 151df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Data structures used by the directory indexing feature 152df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * 153df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: all of the multibyte integer fields are little endian. 154df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */ 155df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 156df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/* 157df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: dx_root_info is laid out so that if it should somehow get 158df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * overlaid by a dirent the two low bits of the hash version will be 159df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * zero. Therefore, the hash version mod 4 should never be 0. 160df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Sincerely, the paranoia department. 161df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */ 162df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_root_info { 163df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 reserved_zero; 164df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 hash_version; /* 0 now, 1 at release */ 165df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 info_length; /* 8 */ 166df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 indirect_levels; 167df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 unused_flags; 168df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 169df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 170503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o#define EXT2_HASH_LEGACY 0 171503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o#define EXT2_HASH_HALF_MD4 1 172b33278c4d640c3fc8f99a314b637b7e502fceb9cTheodore Ts'o#define EXT2_HASH_TEA 2 173503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o 174503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o#define EXT2_HASH_FLAG_INCOMPAT 0x1 175503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o 176df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_entry { 177df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 hash; 178df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 block; 179df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 180df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 181df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_countlimit { 182df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u16 limit; 183df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u16 count; 184df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 185df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 186df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 187df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/* 1889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage group descriptors 1899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 190b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 191b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 192b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 193b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 194b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 195b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 1969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 197b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 198b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 1999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 200b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 2019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 2029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Constants relative to the data blocks 2059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2060fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NDIR_BLOCKS 12 2070fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 2080fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 2090fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 2100fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 2119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Inode flags 2149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2150fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 2160fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 2170fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 2189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 2199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 2209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 2219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 2229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 2239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* Reserved for compression usage... */ 2249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIRTY_FL 0x00000100 2259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 2260fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 2279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 2280fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* End compression flags --- maybe not all used */ 2299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 230b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 2319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMAGIC_FL 0x00002000 2329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 233b3f5b4c22939daba86465d05842bce76053bc3cfTheodore Ts'o#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 23488372d5c4b2ebd0405446b42de65bf2b0ebb2408Theodore Ts'o#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 2359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 2369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 23788372d5c4b2ebd0405446b42de65bf2b0ebb2408Theodore Ts'o#define EXT2_FL_USER_VISIBLE 0x0001DFFF /* User visible flags */ 238b3f5b4c22939daba86465d05842bce76053bc3cfTheodore Ts'o#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ 2399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ioctl commands 2429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2430fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 2440fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 2450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 2460fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 2479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of an inode on the disk 2509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_inode { 2529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_mode; /* File mode */ 2539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_uid; /* Low 16 bits of Owner Uid */ 2549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_size; /* Size in bytes */ 2559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_atime; /* Access time */ 2569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_ctime; /* Creation time */ 2579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_mtime; /* Modification time */ 2589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_dtime; /* Deletion Time */ 2599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_gid; /* Low 16 bits of Group Id */ 2609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_links_count; /* Links count */ 2619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_blocks; /* Blocks count */ 2629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_flags; /* File flags */ 2639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o union { 2649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 2659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 l_i_reserved1; 2669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } linux1; 2679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 2689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 h_i_translator; 2699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } hurd1; 2709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 2719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 m_i_reserved1; 2729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } masix1; 2739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } osd1; /* OS dependent 1 */ 2749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 2759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_generation; /* File version (for NFS) */ 2769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_file_acl; /* File ACL */ 2779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_dir_acl; /* Directory ACL */ 2789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_faddr; /* Fragment address */ 2799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o union { 2809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 2819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 l_i_frag; /* Fragment number */ 2829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 l_i_fsize; /* Fragment size */ 2839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_pad1; 2849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 l_i_uid_high; /* these 2 fields */ 2859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 l_i_gid_high; /* were reserved2[0] */ 2869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 l_i_reserved2; 2879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } linux2; 2889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 2899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 h_i_frag; /* Fragment number */ 2909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 h_i_fsize; /* Fragment size */ 2919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_mode_high; 2929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_uid_high; 2939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_gid_high; 2949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 h_i_author; 2959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } hurd2; 2969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 2979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 m_i_frag; /* Fragment number */ 2989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 m_i_fsize; /* Fragment size */ 2999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 m_pad1; 3009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 m_i_reserved2[2]; 3019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } masix2; 3029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } osd2; /* OS dependent 2 */ 3039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 3049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_size_high i_dir_acl 3069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3079f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#if defined(__KERNEL__) || defined(__linux__) 3089f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved1 osd1.linux1.l_i_reserved1 3099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.linux2.l_i_frag 3109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.linux2.l_i_fsize 3119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_low i_uid 3129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_low i_gid 3139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high osd2.linux2.l_i_uid_high 3149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high osd2.linux2.l_i_gid_high 3159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved2 osd2.linux2.l_i_reserved2 3169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#elif defined(__GNU__) 3189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_translator osd1.hurd1.h_i_translator 3209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.hurd2.h_i_frag; 3219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.hurd2.h_i_fsize; 3229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high osd2.hurd2.h_i_uid_high 3239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high osd2.hurd2.h_i_gid_high 3249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_author osd2.hurd2.h_i_author 3259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#elif defined(__masix__) 3279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved1 osd1.masix1.m_i_reserved1 3299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.masix2.m_i_frag 3309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.masix2.m_i_fsize 3319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved2 osd2.masix2.m_i_reserved2 3329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3337da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#endif /* defined(__KERNEL__) || defined(__linux__) */ 3349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * File system states 3379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3380fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 3390fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 3409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Mount flags 3439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 3459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 3469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 3479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 3489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 3499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 3509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 3519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 3529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 3549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 3550fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 3569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_MOUNT_##opt) 3579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal mount counts between two filesystem checks 3599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 3619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 3629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Behaviour when detecting errors 3659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 3679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 3689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_PANIC 3 /* Panic */ 3699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 3709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of the super block 3739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_super_block { 3759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_inodes_count; /* Inodes count */ 3769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_blocks_count; /* Blocks count */ 3779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_r_blocks_count; /* Reserved blocks count */ 3789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_free_blocks_count; /* Free blocks count */ 3799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_free_inodes_count; /* Free inodes count */ 3809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_first_data_block; /* First Data Block */ 3819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_log_block_size; /* Block size */ 3829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __s32 s_log_frag_size; /* Fragment size */ 3839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_blocks_per_group; /* # Blocks per group */ 3849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_frags_per_group; /* # Fragments per group */ 3859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_inodes_per_group; /* # Inodes per group */ 3869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_mtime; /* Mount time */ 3879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_wtime; /* Write time */ 3889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_mnt_count; /* Mount count */ 3899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __s16 s_max_mnt_count; /* Maximal mount count */ 3909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_magic; /* Magic signature */ 3919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_state; /* File system state */ 3929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_errors; /* Behaviour when detecting errors */ 3930fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_minor_rev_level; /* minor revision level */ 3949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_lastcheck; /* time of last check */ 3959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_checkinterval; /* max. time between checks */ 3969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_creator_os; /* OS */ 3979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_rev_level; /* Revision level */ 3989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_def_resuid; /* Default uid for reserved blocks */ 3999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_def_resgid; /* Default gid for reserved blocks */ 4009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* 4019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * These fields are for EXT2_DYNAMIC_REV superblocks only. 4029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 4039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Note: the difference between the compatible feature set and 4049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * the incompatible feature set is that if there is a bit set 4059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * in the incompatible feature set that the kernel doesn't 4069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * know about, it should refuse to mount the filesystem. 4070fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * 4089f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * e2fsck's requirements are more strict; if it doesn't know 4099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * about a feature in either the compatible or incompatible 4109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * feature set, it must abort and not try to meddle with 4119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * things it doesn't understand... 4129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4130fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_first_ino; /* First non-reserved inode */ 4140fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_inode_size; /* size of inode structure */ 4150fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_block_group_nr; /* block group # of this superblock */ 4160fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_compat; /* compatible feature set */ 4170fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_incompat; /* incompatible feature set */ 4180fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 4199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_uuid[16]; /* 128-bit uuid for volume */ 4200fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger char s_volume_name[16]; /* volume name */ 4210fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger char s_last_mounted[64]; /* directory where last mounted */ 4229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_algorithm_usage_bitmap; /* For compression */ 4239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* 4249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Performance hints. Directory preallocation should only 4259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 4269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 4289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 4299e6c5dd73e7bc1a946b2b8b6c5a15c1f9d3534c0Theodore Ts'o __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 4300fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger /* 4319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 4329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 4349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_journal_inum; /* inode number of journal file */ 4359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_journal_dev; /* device number of journal file */ 4369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_last_orphan; /* start of list of inodes to delete */ 437b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u32 s_hash_seed[4]; /* HTREE hash seed */ 438b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u8 s_def_hash_version; /* Default hash version to use */ 439b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u8 s_reserved_char_pad; 440b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u16 s_reserved_word_pad; 441a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o __u32 s_default_mount_opts; 442c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o __u32 s_first_meta_bg; /* First metablock group */ 443c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o __u32 s_reserved[190]; /* Padding to the end of the block */ 4449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 4459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Codes for operating systems 4489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_LINUX 0 4509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_HURD 1 4519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_MASIX 2 4529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_FREEBSD 3 4539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_LITES 4 4549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Revision levels 4579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 4590fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 4609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 4629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 4639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_INODE_SIZE 128 4659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Feature set definitions 4689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 4719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_compat & (mask) ) 4729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 4739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 4749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 4759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 4769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 4789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 4799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 480b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 4819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 482b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 4839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 4859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 4869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 4879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 4899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 4909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 4919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 492c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 4939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_SUPP 0 495c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 4969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 4979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 4989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 4999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Default values for user and/or group using reserved blocks 5029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5030fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DEF_RESUID 0 5040fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DEF_RESGID 0 5059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 507a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o * Default mount options 508a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o */ 509a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_DEBUG 0x0001 510a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_BSDGROUPS 0x0002 511a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_XATTR_USER 0x0004 512a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_ACL 0x0008 513a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_UID16 0x0010 5144a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE 0x0060 5154a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_DATA 0x0020 5164a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_ORDERED 0x0040 5174a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_WBACK 0x0060 518a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o 519a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o/* 5209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of a directory entry 5219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NAME_LEN 255 5239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_dir_entry { 5259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 inode; /* Inode number */ 5269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 rec_len; /* Directory entry length */ 5279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 name_len; /* Name length */ 5289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o char name[EXT2_NAME_LEN]; /* File name */ 5299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 5309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The new version of the directory entry. Since EXT2 structures are 5339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * stored in intel byte order, and the name_len field could never be 5349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * bigger than 255 chars, it's safe to reclaim the extra byte for the 5359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * file_type field. 5369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_dir_entry_2 { 5389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 inode; /* Inode number */ 5399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 rec_len; /* Directory entry length */ 5409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 name_len; /* Name length */ 5419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 file_type; 5429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o char name[EXT2_NAME_LEN]; /* File name */ 5439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 5449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Ext2 directory file types. Only the low 3 bits are used. The 5479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * other bits are reserved for now. 5489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_UNKNOWN 0 5509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_REG_FILE 1 5519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_DIR 2 5529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_CHRDEV 3 5530fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_FT_BLKDEV 4 5549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_FIFO 5 5559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_SOCK 6 5569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_SYMLINK 7 5579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_MAX 8 5599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * EXT2_DIR_PAD defines the directory entries boundaries 5629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 5639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * NOTE: It must be a multiple of 4 5649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5650fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIR_PAD 4 5660fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 5679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 5689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ~EXT2_DIR_ROUND) 5699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif /* _LINUX_EXT2_FS_H */ 571