ext2_fs.h revision 3166c58dc0e2be55c9414e019607902c85485e83
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 */ 74bec6f49a46ec78a4c5928a22214848a7ea654704Theodore Ts'o#define EXT2_LINK_MAX 65000 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 */ 8039dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 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{ 1408061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_block_bitmap; /* Blocks bitmap block */ 1418061d2c144bf22ce3e170e40a194932da4baf8fbTheodore 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 */ 146f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o __u16 bg_flags; 1478815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o __u32 bg_reserved[2]; 1488815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o __u16 bg_itable_unused; /* Unused inodes count */ 1498815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 1509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1528061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'ostruct ext4_group_desc 1538061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o{ 1548061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_block_bitmap; /* Blocks bitmap block */ 1558061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_bitmap; /* Inodes bitmap block */ 1568061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_table; /* Inodes table block */ 1578061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_blocks_count; /* Free blocks count */ 1588061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_inodes_count; /* Free inodes count */ 1598061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_used_dirs_count; /* Directories count */ 1608061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_flags; 1618061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_reserved[2]; 1628061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_itable_unused; /* Unused inodes count */ 1638061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 1648061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 1658061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 1668061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_table_hi; /* Inodes table block MSB */ 1678061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 1688061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 1698061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 170d2a3bf2ccc2df5167289e9fc084fec3cea78c950Theodore Ts'o __u16 bg_pad; 1718061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_reserved2[3]; 1728061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o}; 1738061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o 174f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 175f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 176f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o 1779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 178df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Data structures used by the directory indexing feature 179df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * 180df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: all of the multibyte integer fields are little endian. 181df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */ 182df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 183df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/* 184df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: dx_root_info is laid out so that if it should somehow get 185df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * overlaid by a dirent the two low bits of the hash version will be 186df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * zero. Therefore, the hash version mod 4 should never be 0. 187df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Sincerely, the paranoia department. 188df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */ 189df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_root_info { 190df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 reserved_zero; 191df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 hash_version; /* 0 now, 1 at release */ 192df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 info_length; /* 8 */ 193df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 indirect_levels; 194df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 unused_flags; 195df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 196df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 197f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_LEGACY 0 198f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_HALF_MD4 1 199f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_TEA 2 200f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 201f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 202f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 203503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o 204503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o#define EXT2_HASH_FLAG_INCOMPAT 0x1 205503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o 206df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_entry { 207df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 hash; 208df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 block; 209df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 210df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 211df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_countlimit { 212df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u16 limit; 213df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u16 count; 214df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 215df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 216df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 217df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/* 2189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage group descriptors 2199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 220b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 221b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 222b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 223b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 224b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 225b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 2269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 227b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 228b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 2299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 230b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 2319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 2329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Constants relative to the data blocks 2359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2360fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NDIR_BLOCKS 12 2370fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 2380fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 2390fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 2400fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 2419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Inode flags 2449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 2460fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 2470fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 2489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 2499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 2509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 2519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 2529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 2539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* Reserved for compression usage... */ 2549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIRTY_FL 0x00000100 2559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 2560fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 2579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 2580fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* End compression flags --- maybe not all used */ 2599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 260b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 2619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMAGIC_FL 0x00002000 2629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 263b3f5b4c22939daba86465d05842bce76053bc3cfTheodore Ts'o#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 26488372d5c4b2ebd0405446b42de65bf2b0ebb2408Theodore Ts'o#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 26515f9011add4013d32ea2f7ca7dbf860f95b8ec53Theodore Ts'o#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 2668fe81a3d53fbaa1670ece5fb7fd11dd5ae45b8daAndreas Dilger#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 2679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 2689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2698fe81a3d53fbaa1670ece5fb7fd11dd5ae45b8daAndreas Dilger#define EXT2_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 270b3f5b4c22939daba86465d05842bce76053bc3cfTheodore Ts'o#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ 2719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ioctl commands 2749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 275bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o 276bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o/* Used for online resize */ 277bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'ostruct ext2_new_group_input { 278bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 group; /* Group number for this data */ 279bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 block_bitmap; /* Absolute block number of block bitmap */ 280bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 281bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 inode_table; /* Absolute block number of inode table start */ 282bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 blocks_count; /* Total number of blocks in this group */ 283bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u16 reserved_blocks; /* Number of reserved blocks in this group */ 284bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u16 unused; /* Number of reserved GDT blocks in group */ 285bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o}; 286bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o 2873166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#ifdef __GNU__ /* Needed for the Hurd */ 2883166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 2893166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#endif 2903166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o 2910fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 2920fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 2930fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 2940fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 295bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 296bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 297bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 298bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 2999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of an inode on the disk 3029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_inode { 3049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_mode; /* File mode */ 3059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_uid; /* Low 16 bits of Owner Uid */ 3069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_size; /* Size in bytes */ 3079f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_atime; /* Access time */ 3086b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_ctime; /* Inode change time */ 3099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_mtime; /* Modification time */ 3109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_dtime; /* Deletion Time */ 3119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_gid; /* Low 16 bits of Group Id */ 3129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_links_count; /* Links count */ 3139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_blocks; /* Blocks count */ 3149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_flags; /* File flags */ 3159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o union { 3169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 317d362a3fb7ec1a2b46601f55f4dbae83563c27717Theodore Ts'o __u32 l_i_version; /* was l_i_reserved1 */ 3189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } linux1; 3199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 h_i_translator; 3219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } hurd1; 3229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 m_i_reserved1; 3249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } masix1; 3259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } osd1; /* OS dependent 1 */ 3269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 3279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_generation; /* File version (for NFS) */ 3289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_file_acl; /* File ACL */ 3299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_dir_acl; /* Directory ACL */ 3309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_faddr; /* Fragment address */ 3319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o union { 3329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3335d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o __u16 l_i_blocks_hi; 3349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_pad1; 3359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 l_i_uid_high; /* these 2 fields */ 3369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 l_i_gid_high; /* were reserved2[0] */ 3379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 l_i_reserved2; 3389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } linux2; 3399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 h_i_frag; /* Fragment number */ 3419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 h_i_fsize; /* Fragment size */ 3429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_mode_high; 3439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_uid_high; 3449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_gid_high; 3459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 h_i_author; 3469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } hurd2; 3479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 m_i_frag; /* Fragment number */ 3499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 m_i_fsize; /* Fragment size */ 3509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 m_pad1; 3519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 m_i_reserved2[2]; 3529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } masix2; 3539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } osd2; /* OS dependent 2 */ 3549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 3559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3567331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o/* 3577331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o * Permanent part of an large inode on the disk 3587331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o */ 3597331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'ostruct ext2_inode_large { 3607331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_mode; /* File mode */ 3617331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_uid; /* Low 16 bits of Owner Uid */ 3627331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_size; /* Size in bytes */ 3637331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_atime; /* Access time */ 3646b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_ctime; /* Inode Change time */ 3657331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_mtime; /* Modification time */ 3667331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_dtime; /* Deletion Time */ 3677331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_gid; /* Low 16 bits of Group Id */ 3687331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_links_count; /* Links count */ 3697331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_blocks; /* Blocks count */ 3707331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_flags; /* File flags */ 3717331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o union { 3727331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 373d362a3fb7ec1a2b46601f55f4dbae83563c27717Theodore Ts'o __u32 l_i_version; /* was l_i_reserved1 */ 3747331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } linux1; 3757331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 3767331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 h_i_translator; 3777331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } hurd1; 3787331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 3797331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 m_i_reserved1; 3807331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } masix1; 3817331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } osd1; /* OS dependent 1 */ 3827331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 3837331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_generation; /* File version (for NFS) */ 3847331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_file_acl; /* File ACL */ 3857331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_dir_acl; /* Directory ACL */ 3867331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_faddr; /* Fragment address */ 3877331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o union { 3887331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 3895d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o __u16 l_i_blocks_hi; 3907331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_pad1; 3917331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 l_i_uid_high; /* these 2 fields */ 3927331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 l_i_gid_high; /* were reserved2[0] */ 3937331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 l_i_reserved2; 3947331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } linux2; 3957331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 3967331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u8 h_i_frag; /* Fragment number */ 3977331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u8 h_i_fsize; /* Fragment size */ 3987331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 h_i_mode_high; 3997331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 h_i_uid_high; 4007331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 h_i_gid_high; 4017331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 h_i_author; 4027331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } hurd2; 4037331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 4047331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u8 m_i_frag; /* Fragment number */ 4057331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u8 m_i_fsize; /* Fragment size */ 4067331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 m_pad1; 4077331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 m_i_reserved2[2]; 4087331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } masix2; 4097331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } osd2; /* OS dependent 2 */ 4107331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_extra_isize; 4117331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_pad1; 4126b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 4136b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 4146b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 4156b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_crtime; /* File creation time */ 4166b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 4177331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o}; 4187331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o 4199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_size_high i_dir_acl 4209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#if defined(__KERNEL__) || defined(__linux__) 4229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved1 osd1.linux1.l_i_reserved1 4239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.linux2.l_i_frag 4249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.linux2.l_i_fsize 4259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_low i_uid 4269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_low i_gid 4279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high osd2.linux2.l_i_uid_high 4289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high osd2.linux2.l_i_gid_high 4299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved2 osd2.linux2.l_i_reserved2 4305113a6e32b298671c86ae7da097bcd24540cebc9Eric Sandeen#define inode_uid(inode) ((inode).i_uid | (inode).i_uid_high << 16) 4315113a6e32b298671c86ae7da097bcd24540cebc9Eric Sandeen#define inode_gid(inode) ((inode).i_gid | (inode).i_gid_high << 16) 43248e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#else 43348e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#if defined(__GNU__) 4349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_translator osd1.hurd1.h_i_translator 4369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.hurd2.h_i_frag; 4379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.hurd2.h_i_fsize; 4389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high osd2.hurd2.h_i_uid_high 4399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high osd2.hurd2.h_i_gid_high 4409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_author osd2.hurd2.h_i_author 4415113a6e32b298671c86ae7da097bcd24540cebc9Eric Sandeen#define inode_uid(inode) ((inode).i_uid | (inode).i_uid_high << 16) 4425113a6e32b298671c86ae7da097bcd24540cebc9Eric Sandeen#define inode_gid(inode) ((inode).i_gid | (inode).i_gid_high << 16) 4439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 44448e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#else 44548e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#if defined(__masix__) 4469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved1 osd1.masix1.m_i_reserved1 4489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.masix2.m_i_frag 4499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.masix2.m_i_fsize 4509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved2 osd2.masix2.m_i_reserved2 4515113a6e32b298671c86ae7da097bcd24540cebc9Eric Sandeen#define inode_uid(inode) ((inode).i_uid) 4525113a6e32b298671c86ae7da097bcd24540cebc9Eric Sandeen#define inode_gid(inode) ((inode).i_gid) 4539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 45448e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#endif /* __masix__ */ 45548e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#endif /* __GNU__ */ 4567da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#endif /* defined(__KERNEL__) || defined(__linux__) */ 4579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * File system states 4609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4610fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 4620fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 4639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 465f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o * Misc. filesystem flags 466f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o */ 467f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 468f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 469f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o 470f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o/* 4719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Mount flags 4729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 4749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 4759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 4769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 4779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 4789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 4799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 4809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 4819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 4839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 4840fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 4859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_MOUNT_##opt) 4869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal mount counts between two filesystem checks 4889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 4909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 4919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Behaviour when detecting errors 4949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 4969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 4979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_PANIC 3 /* Panic */ 4989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 4999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of the super block 5029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_super_block { 5049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_inodes_count; /* Inodes count */ 5059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_blocks_count; /* Blocks count */ 5069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_r_blocks_count; /* Reserved blocks count */ 5079f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_free_blocks_count; /* Free blocks count */ 5089f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_free_inodes_count; /* Free inodes count */ 5099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_first_data_block; /* First Data Block */ 5109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_log_block_size; /* Block size */ 5119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __s32 s_log_frag_size; /* Fragment size */ 5129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_blocks_per_group; /* # Blocks per group */ 5139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_frags_per_group; /* # Fragments per group */ 5149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_inodes_per_group; /* # Inodes per group */ 5159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_mtime; /* Mount time */ 5169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_wtime; /* Write time */ 5179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_mnt_count; /* Mount count */ 5189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __s16 s_max_mnt_count; /* Maximal mount count */ 5199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_magic; /* Magic signature */ 5209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_state; /* File system state */ 5219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_errors; /* Behaviour when detecting errors */ 5220fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_minor_rev_level; /* minor revision level */ 5239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_lastcheck; /* time of last check */ 5249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_checkinterval; /* max. time between checks */ 5259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_creator_os; /* OS */ 5269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_rev_level; /* Revision level */ 5279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_def_resuid; /* Default uid for reserved blocks */ 5289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_def_resgid; /* Default gid for reserved blocks */ 5299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* 5309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * These fields are for EXT2_DYNAMIC_REV superblocks only. 5319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 5329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Note: the difference between the compatible feature set and 5339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * the incompatible feature set is that if there is a bit set 5349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * in the incompatible feature set that the kernel doesn't 5359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * know about, it should refuse to mount the filesystem. 5360fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * 5379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * e2fsck's requirements are more strict; if it doesn't know 5389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * about a feature in either the compatible or incompatible 5399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * feature set, it must abort and not try to meddle with 5409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * things it doesn't understand... 5419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5420fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_first_ino; /* First non-reserved inode */ 5430fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_inode_size; /* size of inode structure */ 5440fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_block_group_nr; /* block group # of this superblock */ 5450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_compat; /* compatible feature set */ 5460fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_incompat; /* incompatible feature set */ 5470fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 5489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_uuid[16]; /* 128-bit uuid for volume */ 5490fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger char s_volume_name[16]; /* volume name */ 5500fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger char s_last_mounted[64]; /* directory where last mounted */ 5519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_algorithm_usage_bitmap; /* For compression */ 5529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* 5539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Performance hints. Directory preallocation should only 5549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 5559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 5579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 5589e6c5dd73e7bc1a946b2b8b6c5a15c1f9d3534c0Theodore Ts'o __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 5590fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger /* 5609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 5619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 5639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_journal_inum; /* inode number of journal file */ 5649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_journal_dev; /* device number of journal file */ 5659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_last_orphan; /* start of list of inodes to delete */ 566b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u32 s_hash_seed[4]; /* HTREE hash seed */ 567b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u8 s_def_hash_version; /* Default hash version to use */ 568a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o __u8 s_jnl_backup_type; /* Default type of journal backup */ 5698061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 570a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o __u32 s_default_mount_opts; 571c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o __u32 s_first_meta_bg; /* First metablock group */ 5729d2aefb3bc0a48b1540d06e1983aa96c56d39e17Theodore Ts'o __u32 s_mkfs_time; /* When the filesystem was created */ 5731ba7a2f2b6a9b152828a06443955a7fb1d139930Theodore Ts'o __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 5748061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 5758061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 5768061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 s_free_blocks_hi; /* Free blocks count */ 5776b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 5786b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 579f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o __u32 s_flags; /* Miscellaneous flags */ 58096c6a3acd377698cb99ffd9925bec9b20ca4f6f9Theodore Ts'o __u16 s_raid_stride; /* RAID stride */ 581b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 582b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u64 s_mmp_block; /* Block for multi-mount protection */ 583decb2a5b3a1e346ddb725a3ba01b759d8c9ee4e6Theodore Ts'o __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 584decb2a5b3a1e346ddb725a3ba01b759d8c9ee4e6Theodore Ts'o __u32 s_reserved[163]; /* Padding to the end of the block */ 5859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 5869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Codes for operating systems 5899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_LINUX 0 5919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_HURD 1 5929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_MASIX 2 5939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_FREEBSD 3 5949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_LITES 4 5959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 5969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Revision levels 5989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 6000fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 6019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 6039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 6049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_INODE_SIZE 128 6069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6079f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 608a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o * Journal inode backup types 609a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o */ 610a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o#define EXT3_JNL_BACKUP_BLOCKS 1 611a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o 612a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o/* 6139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Feature set definitions 6149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 6179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_compat & (mask) ) 6189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 6199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 6209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 6219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 6229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 6249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 6259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 626b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 6279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 628b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 629f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 6309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 6329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 6332c93113e6ac1384abd1935af7217b783fdcb3023Theodore Ts'o/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 6345d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 6358815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 636bec6f49a46ec78a4c5928a22214848a7ea654704Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 6376b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 6389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 6409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 6419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 6429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 643c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 64439dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 6458061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 646b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 64739dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o 6489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_SUPP 0 650c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 6519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 6529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 6539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 6549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 6569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Default values for user and/or group using reserved blocks 6579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6580fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DEF_RESUID 0 6590fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DEF_RESGID 0 6609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 662a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o * Default mount options 663a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o */ 664a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_DEBUG 0x0001 665a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_BSDGROUPS 0x0002 666a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_XATTR_USER 0x0004 667a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_ACL 0x0008 668a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_UID16 0x0010 6694a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE 0x0060 6704a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_DATA 0x0020 6714a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_ORDERED 0x0040 6724a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_WBACK 0x0060 673a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o 674a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o/* 6759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of a directory entry 6769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NAME_LEN 255 6789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_dir_entry { 6809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 inode; /* Inode number */ 6819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 rec_len; /* Directory entry length */ 6829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 name_len; /* Name length */ 6839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o char name[EXT2_NAME_LEN]; /* File name */ 6849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 6859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 6879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The new version of the directory entry. Since EXT2 structures are 6889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * stored in intel byte order, and the name_len field could never be 6899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * bigger than 255 chars, it's safe to reclaim the extra byte for the 6909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * file_type field. 6919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_dir_entry_2 { 6939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 inode; /* Inode number */ 6949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 rec_len; /* Directory entry length */ 6959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 name_len; /* Name length */ 6969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 file_type; 6979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o char name[EXT2_NAME_LEN]; /* File name */ 6989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 6999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 7019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Ext2 directory file types. Only the low 3 bits are used. The 7029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * other bits are reserved for now. 7039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 7049f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_UNKNOWN 0 7059f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_REG_FILE 1 7069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_DIR 2 7079f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_CHRDEV 3 7080fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_FT_BLKDEV 4 7099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_FIFO 5 7109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_SOCK 6 7119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_SYMLINK 7 7129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_MAX 8 7149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 7169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * EXT2_DIR_PAD defines the directory entries boundaries 7179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 7189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * NOTE: It must be a multiple of 4 7199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 7200fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIR_PAD 4 7210fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 7229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 7239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ~EXT2_DIR_ROUND) 7249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 725b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger/* 726b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * This structure will be used for multiple mount protection. It will be 727b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * written into the block number saved in the s_mmp_block field in the 728b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * superblock. 729b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger */ 730b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 731b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 732b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 733b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger 734b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilgerstruct mmp_struct { 735b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u32 mmp_magic; 736b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u32 mmp_seq; 737b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u64 mmp_time; 738b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger char mmp_nodename[64]; 739b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger char mmp_bdevname[32]; 740b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u16 mmp_interval; 741b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u16 mmp_pad1; 742b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u32 mmp_pad2; 743b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger}; 744b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger 745b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger/* 746b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * Interval in number of seconds to update the MMP sequence number. 747b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger */ 748b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_DEF_INTERVAL 5 749b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger 7509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif /* _LINUX_EXT2_FS_H */ 751