ext2_fs.h revision 9345f02671fd39cad69338080b62e12e8b86671d
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 */ 536d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ 549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* First non-reserved inode for old ext2 filesystems */ 569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_FIRST_INO 11 579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The second extended file system magic number 609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SUPER_MAGIC 0xEF53 629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 630fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#ifdef __KERNEL__ 640fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 650fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#else 660fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* Assume that user mode programs are passing in an ext2fs superblock, not 670fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * a kernel struct super_block. This will allow us to call the feature-test 680fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * macros from user land. */ 690fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SB(sb) (sb) 700fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#endif 710fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger 729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal count of links to a file 749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 75bec6f49a46ec78a4c5928a22214848a7ea654704Theodore Ts'o#define EXT2_LINK_MAX 65000 769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage several block sizes 799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 80932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 8139dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 827da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 837da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 857da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 867da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 870fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 887da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 897da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 917da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 927da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 947da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 967da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 987da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 1019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage fragments 1029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 103932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 1040fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 105932a489cdf6bc83d69e59d3f8e0a57b733799ce1Andreas Dilger#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 1069f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 1070fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 1080fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 1099f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 1109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 1119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 1129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 1139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 1159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ACL structures 1169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 1179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_acl_header /* Header of Access Control Lists */ 1189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{ 1199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_size; 1209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_file_count; 1219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_acle_count; 1229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 aclh_first_acle; 1239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_acl_entry /* Access Control List Entry */ 1269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{ 1279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 acle_size; 1289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_perms; /* Access permissions */ 1299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_type; /* Type of entry */ 1309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_tag; /* User or group identity */ 1319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 acle_pad1; 1329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 acle_next; /* Pointer on next entry for the */ 1339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* same inode or on next free entry */ 1349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 1379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of a blocks group descriptor 1389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 1399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_group_desc 1409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o{ 1418061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_block_bitmap; /* Blocks bitmap block */ 1428061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_bitmap; /* Inodes bitmap block */ 1439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 bg_inode_table; /* Inodes table block */ 1449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_free_blocks_count; /* Free blocks count */ 1459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_free_inodes_count; /* Free inodes count */ 1469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 bg_used_dirs_count; /* Directories count */ 147f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o __u16 bg_flags; 1488815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o __u32 bg_reserved[2]; 1498815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o __u16 bg_itable_unused; /* Unused inodes count */ 1508815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 1519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 1529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 1538061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'ostruct ext4_group_desc 1548061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o{ 1558061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_block_bitmap; /* Blocks bitmap block */ 1568061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_bitmap; /* Inodes bitmap block */ 1578061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_table; /* Inodes table block */ 1588061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_blocks_count; /* Free blocks count */ 1598061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_inodes_count; /* Free inodes count */ 1608061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_used_dirs_count; /* Directories count */ 1618061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_flags; 1628061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_reserved[2]; 1638061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_itable_unused; /* Unused inodes count */ 1648061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 1658061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 1668061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 1678061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_inode_table_hi; /* Inodes table block MSB */ 1688061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 1698061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 1708061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 171d2a3bf2ccc2df5167289e9fc084fec3cea78c950Theodore Ts'o __u16 bg_pad; 1728061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 bg_reserved2[3]; 1738061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o}; 1748061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o 175f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 176f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 177ca2634a46ab9da85a3a015a7772770d9dbe5848eJose R. Santos#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 178f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o 1799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 180df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Data structures used by the directory indexing feature 181df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * 182df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: all of the multibyte integer fields are little endian. 183df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */ 184df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 185df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/* 186df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Note: dx_root_info is laid out so that if it should somehow get 187df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * overlaid by a dirent the two low bits of the hash version will be 188df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * zero. Therefore, the hash version mod 4 should never be 0. 189df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o * Sincerely, the paranoia department. 190df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o */ 191df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_root_info { 192df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 reserved_zero; 193df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 hash_version; /* 0 now, 1 at release */ 194df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 info_length; /* 8 */ 195df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 indirect_levels; 196df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u8 unused_flags; 197df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 198df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 199f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_LEGACY 0 200f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_HALF_MD4 1 201f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_TEA 2 202f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 203f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 204f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 205503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o 206503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o#define EXT2_HASH_FLAG_INCOMPAT 0x1 207503f9e7f6eb331c5b75d7f1ad126f71bcdcfb4e3Theodore Ts'o 208df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_entry { 209df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 hash; 210df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u32 block; 211df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 212df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 213df614db6ef79c767745b8154c26d69398b571605Theodore Ts'ostruct ext2_dx_countlimit { 214df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u16 limit; 215df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o __u16 count; 216df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o}; 217df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 218df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o 219df614db6ef79c767745b8154c26d69398b571605Theodore Ts'o/* 2209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Macro-instructions used to manage group descriptors 2219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 222f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_MIN_DESC_SIZE 32 223f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_MIN_DESC_SIZE_64BIT 64 224f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 225f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_DESC_SIZE(s) \ 226f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 227f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 228f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement 229b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 230b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 231b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 232b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 233b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 234b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 2359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#ifdef __KERNEL__ 236b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 237b21bf267783274683a432eea6e5c589eab94123eAndreas Dilger#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 2389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#else 239f2de1d38d0819b17895977fabc52d81d0ea6ec00Valerie Clement#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 2409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif 2419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Constants relative to the data blocks 2449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2450fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NDIR_BLOCKS 12 2460fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 2470fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 2480fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 2490fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 2509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Inode flags 2539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 2540fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 2550fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 2560fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 2579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 2589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 2599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 2609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 2619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 2629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* Reserved for compression usage... */ 2639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIRTY_FL 0x00000100 2649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 2650fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 2669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 2670fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger/* End compression flags --- maybe not all used */ 2689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 269b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 2709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_IMAGIC_FL 0x00002000 2719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 272b3f5b4c22939daba86465d05842bce76053bc3cfTheodore Ts'o#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 27388372d5c4b2ebd0405446b42de65bf2b0ebb2408Theodore Ts'o#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 27415f9011add4013d32ea2f7ca7dbf860f95b8ec53Theodore Ts'o#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 2751ca1059fd0126fd2c065f272a566c18f14bab16dTheodore Ts'o#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 2768fe81a3d53fbaa1670ece5fb7fd11dd5ae45b8daAndreas Dilger#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 277cff9690f4e114d95c9031a7468c99fda0ddcb3ecAndreas Dilger#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 2784ffafee26cf791c0c651c08d3dcefcdd363bf127Eric Sandeen#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 2796d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 2806d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 2816d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 2829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 2839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2844ffafee26cf791c0c651c08d3dcefcdd363bf127Eric Sandeen#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 2854ffafee26cf791c0c651c08d3dcefcdd363bf127Eric Sandeen#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 2869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 2879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 2889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * ioctl commands 2899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 290bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o 291bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o/* Used for online resize */ 292bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'ostruct ext2_new_group_input { 293bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 group; /* Group number for this data */ 294bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 block_bitmap; /* Absolute block number of block bitmap */ 295bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 296bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 inode_table; /* Absolute block number of inode table start */ 297bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u32 blocks_count; /* Total number of blocks in this group */ 298bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u16 reserved_blocks; /* Number of reserved blocks in this group */ 299bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o __u16 unused; /* Number of reserved GDT blocks in group */ 300bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o}; 301bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o 3025c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'ostruct ext4_new_group_input { 3035c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u32 group; /* Group number for this data */ 3045c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u64 block_bitmap; /* Absolute block number of block bitmap */ 3055c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 3065c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u64 inode_table; /* Absolute block number of inode table start */ 3075c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u32 blocks_count; /* Total number of blocks in this group */ 3085c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u16 reserved_blocks; /* Number of reserved blocks in this group */ 3095c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o __u16 unused; 3105c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o}; 3115c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o 3123166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#ifdef __GNU__ /* Needed for the Hurd */ 3133166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 3143166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o#endif 3153166c58dc0e2be55c9414e019607902c85485e83Theodore Ts'o 3160fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 3170fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 3180fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 3190fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 320bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 321bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 322bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 323bf69235ad0073c80386b70caba0e1b58e5f85697Theodore Ts'o#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 3245c4f8d674845095050f94ea95f3c73072cbe34b5Theodore Ts'o#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 3259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 3279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of an inode on the disk 3289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 3299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_inode { 3309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_mode; /* File mode */ 3319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_uid; /* Low 16 bits of Owner Uid */ 3329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_size; /* Size in bytes */ 3339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_atime; /* Access time */ 3346b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_ctime; /* Inode change time */ 3359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_mtime; /* Modification time */ 3369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_dtime; /* Deletion Time */ 3379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_gid; /* Low 16 bits of Group Id */ 3389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 i_links_count; /* Links count */ 3399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_blocks; /* Blocks count */ 3409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_flags; /* File flags */ 3419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o union { 3429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 343d362a3fb7ec1a2b46601f55f4dbae83563c27717Theodore Ts'o __u32 l_i_version; /* was l_i_reserved1 */ 3449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } linux1; 3459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 h_i_translator; 3479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } hurd1; 3489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } osd1; /* OS dependent 1 */ 3499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 3509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_generation; /* File version (for NFS) */ 3519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_file_acl; /* File ACL */ 3529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_dir_acl; /* Directory ACL */ 3539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 i_faddr; /* Fragment address */ 3549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o union { 3559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3565d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o __u16 l_i_blocks_hi; 357bb767b2fc3b4420f566df6f563574fd8e5c856b1Theodore Ts'o __u16 l_i_file_acl_high; 3589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 l_i_uid_high; /* these 2 fields */ 3599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 l_i_gid_high; /* were reserved2[0] */ 3609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 l_i_reserved2; 3619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } linux2; 3629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o struct { 3639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 h_i_frag; /* Fragment number */ 3649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 h_i_fsize; /* Fragment size */ 3659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_mode_high; 3669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_uid_high; 3679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 h_i_gid_high; 3689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 h_i_author; 3699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } hurd2; 3709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o } osd2; /* OS dependent 2 */ 3719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 3729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 3737331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o/* 3747331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o * Permanent part of an large inode on the disk 3757331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o */ 3767331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'ostruct ext2_inode_large { 3777331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_mode; /* File mode */ 3787331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_uid; /* Low 16 bits of Owner Uid */ 3797331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_size; /* Size in bytes */ 3807331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_atime; /* Access time */ 3816b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_ctime; /* Inode Change time */ 3827331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_mtime; /* Modification time */ 3837331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_dtime; /* Deletion Time */ 3847331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_gid; /* Low 16 bits of Group Id */ 3857331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_links_count; /* Links count */ 3867331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_blocks; /* Blocks count */ 3877331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_flags; /* File flags */ 3887331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o union { 3897331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 390d362a3fb7ec1a2b46601f55f4dbae83563c27717Theodore Ts'o __u32 l_i_version; /* was l_i_reserved1 */ 3917331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } linux1; 3927331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 3937331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 h_i_translator; 3947331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } hurd1; 3957331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } osd1; /* OS dependent 1 */ 3967331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 3977331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_generation; /* File version (for NFS) */ 3987331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_file_acl; /* File ACL */ 3997331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_dir_acl; /* Directory ACL */ 4007331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 i_faddr; /* Fragment address */ 4017331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o union { 4027331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 4035d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o __u16 l_i_blocks_hi; 404bb767b2fc3b4420f566df6f563574fd8e5c856b1Theodore Ts'o __u16 l_i_file_acl_high; 4057331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 l_i_uid_high; /* these 2 fields */ 4067331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 l_i_gid_high; /* were reserved2[0] */ 4077331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 l_i_reserved2; 4087331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } linux2; 4097331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o struct { 4107331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u8 h_i_frag; /* Fragment number */ 4117331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u8 h_i_fsize; /* Fragment size */ 4127331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 h_i_mode_high; 4137331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 h_i_uid_high; 4147331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 h_i_gid_high; 4157331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u32 h_i_author; 4167331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } hurd2; 4177331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o } osd2; /* OS dependent 2 */ 4187331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_extra_isize; 4197331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o __u16 i_pad1; 4206b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 4216b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 4226b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 4236b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_crtime; /* File creation time */ 4246b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 425bb767b2fc3b4420f566df6f563574fd8e5c856b1Theodore Ts'o __u32 i_version_hi; /* high 32 bits for 64-bit version */ 4267331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o}; 4277331196a16e57ef80dd6ae40eeeab14747ce2f5dTheodore Ts'o 4289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_size_high i_dir_acl 4299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#if defined(__KERNEL__) || defined(__linux__) 4319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved1 osd1.linux1.l_i_reserved1 4329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.linux2.l_i_frag 4339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.linux2.l_i_fsize 4349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_low i_uid 4359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_low i_gid 4369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high osd2.linux2.l_i_uid_high 4379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high osd2.linux2.l_i_gid_high 4389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_reserved2 osd2.linux2.l_i_reserved2 43948e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#else 44048e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#if defined(__GNU__) 4419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_translator osd1.hurd1.h_i_translator 4439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_frag osd2.hurd2.h_i_frag; 4449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_fsize osd2.hurd2.h_i_fsize; 4459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_uid_high osd2.hurd2.h_i_uid_high 4469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_gid_high osd2.hurd2.h_i_gid_high 4479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define i_author osd2.hurd2.h_i_author 4489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 44948e6e81362f264aee4f3945c14928efaf71a06c9Theodore Ts'o#endif /* __GNU__ */ 4507da78ff17df7d2c1eeebbc2b0727106b63c08a68Andreas Dilger#endif /* defined(__KERNEL__) || defined(__linux__) */ 4519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4527132d48d83f79992773b6d9f1cace8d96366f08bTheodore Ts'o#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 4537132d48d83f79992773b6d9f1cace8d96366f08bTheodore Ts'o#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 454153439222e6a16e40be324408d8d19361bc1e65eTheodore Ts'o#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 455153439222e6a16e40be324408d8d19361bc1e65eTheodore Ts'o#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 4563306861158a1ca27b7ec83bb33fb8fbbf043d24cTheodore Ts'o 4579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * File system states 4599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4600fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 4610fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 462a80f3694a7b99756e747683f01ab8a5bca022251Theodore Ts'o#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 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 */ 4696cb27404f51f97e2665fa0e0c4c0f7bc47e698ecTheodore Ts'o#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 4706d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 4716d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 4726d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 473f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o 474f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o/* 4759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Mount flags 4769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 4789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 4799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 4809f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 4819f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 4829f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 4839f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 4849f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 4859f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4869f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 4879f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 4880fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 4899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_MOUNT_##opt) 4909f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Maximal mount counts between two filesystem checks 4929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4939f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 4949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 4959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 4969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 4979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Behaviour when detecting errors 4989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 4999f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 5009f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 5019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_PANIC 3 /* Panic */ 5029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 5039f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 504993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#if (__GNUC__ >= 4) 505993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 506993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#else 507993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 508993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#endif 509993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o 5109f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 5119f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of the super block 5129f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5139f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_super_block { 5149f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_inodes_count; /* Inodes count */ 5159f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_blocks_count; /* Blocks count */ 5169f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_r_blocks_count; /* Reserved blocks count */ 5179f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_free_blocks_count; /* Free blocks count */ 5189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_free_inodes_count; /* Free inodes count */ 5199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_first_data_block; /* First Data Block */ 5209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_log_block_size; /* Block size */ 5219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __s32 s_log_frag_size; /* Fragment size */ 5229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_blocks_per_group; /* # Blocks per group */ 5239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_frags_per_group; /* # Fragments per group */ 5249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_inodes_per_group; /* # Inodes per group */ 5259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_mtime; /* Mount time */ 5269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_wtime; /* Write time */ 5279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_mnt_count; /* Mount count */ 5289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __s16 s_max_mnt_count; /* Maximal mount count */ 5299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_magic; /* Magic signature */ 5309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_state; /* File system state */ 5319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_errors; /* Behaviour when detecting errors */ 5320fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_minor_rev_level; /* minor revision level */ 5339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_lastcheck; /* time of last check */ 5349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_checkinterval; /* max. time between checks */ 5359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_creator_os; /* OS */ 5369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_rev_level; /* Revision level */ 5379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_def_resuid; /* Default uid for reserved blocks */ 5389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 s_def_resgid; /* Default gid for reserved blocks */ 5399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* 5409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * These fields are for EXT2_DYNAMIC_REV superblocks only. 5419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 5429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Note: the difference between the compatible feature set and 5439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * the incompatible feature set is that if there is a bit set 5449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * in the incompatible feature set that the kernel doesn't 5459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * know about, it should refuse to mount the filesystem. 5460fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger * 5479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * e2fsck's requirements are more strict; if it doesn't know 5489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * about a feature in either the compatible or incompatible 5499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * feature set, it must abort and not try to meddle with 5509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * things it doesn't understand... 5519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5520fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_first_ino; /* First non-reserved inode */ 5530fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_inode_size; /* size of inode structure */ 5540fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u16 s_block_group_nr; /* block group # of this superblock */ 5550fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_compat; /* compatible feature set */ 5560fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_incompat; /* incompatible feature set */ 5570fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 5589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_uuid[16]; /* 128-bit uuid for volume */ 5590fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger char s_volume_name[16]; /* volume name */ 5600fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger char s_last_mounted[64]; /* directory where last mounted */ 5619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_algorithm_usage_bitmap; /* For compression */ 5629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o /* 5639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Performance hints. Directory preallocation should only 5649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 5659f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 5679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 5689e6c5dd73e7bc1a946b2b8b6c5a15c1f9d3534c0Theodore Ts'o __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 5690fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger /* 5709f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 5719f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 5729f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 5739f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_journal_inum; /* inode number of journal file */ 5749f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_journal_dev; /* device number of journal file */ 5759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 s_last_orphan; /* start of list of inodes to delete */ 576b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u32 s_hash_seed[4]; /* HTREE hash seed */ 577b7a00563b22b0ea47ddc7117508c0b8e0d65df43Theodore Ts'o __u8 s_def_hash_version; /* Default hash version to use */ 578a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o __u8 s_jnl_backup_type; /* Default type of journal backup */ 5798061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 580a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o __u32 s_default_mount_opts; 581c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o __u32 s_first_meta_bg; /* First metablock group */ 5829d2aefb3bc0a48b1540d06e1983aa96c56d39e17Theodore Ts'o __u32 s_mkfs_time; /* When the filesystem was created */ 5831ba7a2f2b6a9b152828a06443955a7fb1d139930Theodore Ts'o __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 5848061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 5858061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 5868061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o __u32 s_free_blocks_hi; /* Free blocks count */ 5876b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 5886b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 589f77704e416fca7dbe4cc91abba674d2ae3c14f6fTheodore Ts'o __u32 s_flags; /* Miscellaneous flags */ 59096c6a3acd377698cb99ffd9925bec9b20ca4f6f9Theodore Ts'o __u16 s_raid_stride; /* RAID stride */ 591b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 592b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u64 s_mmp_block; /* Block for multi-mount protection */ 593decb2a5b3a1e346ddb725a3ba01b759d8c9ee4e6Theodore Ts'o __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 594494a1daad37a8098e7db166d558aab3e9e37ac48Theodore Ts'o __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 595494a1daad37a8098e7db166d558aab3e9e37ac48Theodore Ts'o __u8 s_reserved_char_pad; 596494a1daad37a8098e7db166d558aab3e9e37ac48Theodore Ts'o __u16 s_reserved_pad; /* Padding to next 32bits */ 597b7c5b4030870b31d73019d9d9ec55d550772590bTheodore Ts'o __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 5986d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o __u32 s_snapshot_inum; /* Inode number of active snapshot */ 5996d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o __u32 s_snapshot_id; /* sequential ID of active snapshot */ 6006d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 6016d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o snapshot's future use */ 6026d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 603993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 604993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_error_count; /* number of fs errors */ 605993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_first_error_time; /* first time an error happened */ 606993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_first_error_ino; /* inode involved in first error */ 607993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u64 s_first_error_block; /* block involved of first error */ 608993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u8 s_first_error_func[32]; /* function where the error happened */ 609993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_first_error_line; /* line number where error happened */ 610993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_last_error_time; /* most recent time of an error */ 611993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_last_error_ino; /* inode involved in last error */ 612993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u32 s_last_error_line; /* line number where error happened */ 613993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u64 s_last_error_block; /* block involved of last error */ 614993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o __u8 s_last_error_func[32]; /* function where the error happened */ 6159345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 6169345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o __u8 s_mount_opts[64]; 6179345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o __u32 s_reserved[112]; /* Padding to the end of the block */ 6189f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 6199f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 620993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 621993988f65527e5665181b3e4a6161f317e396489Theodore Ts'o 6229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 6239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Codes for operating systems 6249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_LINUX 0 6269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_HURD 1 627c9548bc37e5d0f55308ebbb74b1e19ce7f88ada1Coly Li#define EXT2_OBSO_OS_MASIX 2 6289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_FREEBSD 3 6299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_OS_LITES 4 6309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 6329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Revision levels 6339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 6350fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 6369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 6389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 6399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_GOOD_OLD_INODE_SIZE 128 6419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 643a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o * Journal inode backup types 644a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o */ 645a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o#define EXT3_JNL_BACKUP_BLOCKS 1 646a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o 647a435ec3449694a8fa299337197cc09624960a3a6Theodore Ts'o/* 6489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Feature set definitions 6499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 6529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_compat & (mask) ) 6539f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 6549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 6559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 6569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 6579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 6599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 6609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 661b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 6629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 663b10820cdcd5f007894b81cf716cf1fdd8523bbcaTheodore Ts'o#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 664f5fa20078bfc05b554294fe9c5505375d7913e8cTheodore Ts'o#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 6656d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 6669f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 6689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 6692c93113e6ac1384abd1935af7217b783fdcb3023Theodore Ts'o/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 6705d17119d14fe1276936c85d7986695a4543b1aa1Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 6718815fb8a00f5a441eb62f035353db9e0cca90b38Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 672bec6f49a46ec78a4c5928a22214848a7ea654704Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 6736b3ce9871c3424d0b41e0c7227ddc116d2e0de1aTheodore Ts'o#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 6746d0ed6780285e79360353d4b06b339c00712d754Theodore Ts'o#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 6759f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6769f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 6779f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 6789f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 6799f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 680c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 68139dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 6828061d2c144bf22ce3e170e40a194932da4baf8fbTheodore Ts'o#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 683b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 684cf0eeec0159b1af67fad9bccce220402cf08dff0Jose R. Santos#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 685cff9690f4e114d95c9031a7468c99fda0ddcb3ecAndreas Dilger#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 68630a7610edfc0c22cb6b5ad9f76f65700fb6ffe98Andreas Dilger#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 68739dc1c45cb41ce37a56d364103bb852d0b62c835Theodore Ts'o 6889f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6899f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_COMPAT_SUPP 0 690c046ac7f2e4c53e20cf1e909bbe511f91074b396Theodore Ts'o#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 6919f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 6929f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 693a7c9cb7d0dc464eda26958595b728a6c3a4cacbcAndreas Dilger EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 6949f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 6959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 6969f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 6979f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Default values for user and/or group using reserved blocks 6989f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 6990fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DEF_RESUID 0 7000fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DEF_RESGID 0 7019f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7029f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 703a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o * Default mount options 704a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o */ 705a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_DEBUG 0x0001 706a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_BSDGROUPS 0x0002 707a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_XATTR_USER 0x0004 708a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_ACL 0x0008 709a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o#define EXT2_DEFM_UID16 0x0010 710efc6f628e15de95bcd13e4f0ee223cb42115d520Theodore Ts'o#define EXT3_DEFM_JMODE 0x0060 7114a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_DATA 0x0020 7124a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_ORDERED 0x0040 7134a959fe6f18a3b6023234a66f4455f7ec660b8b4Theodore Ts'o#define EXT3_DEFM_JMODE_WBACK 0x0060 7149345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o#define EXT4_DEFM_NOBARRIER 0x0100 7159345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 7169345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o#define EXT4_DEFM_DISCARD 0x0400 7179345f02671fd39cad69338080b62e12e8b86671dTheodore Ts'o#define EXT4_DEFM_NODELALLOC 0x0800 718a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o 719a0c3fd5e4cdc2e0b032c9ace89d960a622069c32Theodore Ts'o/* 7209f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Structure of a directory entry 7219f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 7229f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_NAME_LEN 255 7239f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7249f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_dir_entry { 7259f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 inode; /* Inode number */ 7269f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 rec_len; /* Directory entry length */ 7279f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 name_len; /* Name length */ 7289f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o char name[EXT2_NAME_LEN]; /* File name */ 7299f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 7309f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7319f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 7329f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * The new version of the directory entry. Since EXT2 structures are 7339f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * stored in intel byte order, and the name_len field could never be 7349f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * bigger than 255 chars, it's safe to reclaim the extra byte for the 7359f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * file_type field. 7369f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 7379f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'ostruct ext2_dir_entry_2 { 7389f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u32 inode; /* Inode number */ 7399f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u16 rec_len; /* Directory entry length */ 7409f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 name_len; /* Name length */ 7419f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o __u8 file_type; 7429f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o char name[EXT2_NAME_LEN]; /* File name */ 7439f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o}; 7449f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7459f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 7469f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * Ext2 directory file types. Only the low 3 bits are used. The 7479f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * other bits are reserved for now. 7489f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 7499f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_UNKNOWN 0 7509f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_REG_FILE 1 7519f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_DIR 2 7529f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_CHRDEV 3 7530fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_FT_BLKDEV 4 7549f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_FIFO 5 7559f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_SOCK 6 7569f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_SYMLINK 7 7579f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7589f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_FT_MAX 8 7599f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 7609f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o/* 7619f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * EXT2_DIR_PAD defines the directory entries boundaries 7629f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * 7639f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o * NOTE: It must be a multiple of 4 7649f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o */ 7650fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIR_PAD 4 7660fbd1a8a9a2ef697927f886559344ffa1bb2eefaAndreas Dilger#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 7679f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 7689f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o ~EXT2_DIR_ROUND) 7699f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o 770b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger/* 771b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * This structure will be used for multiple mount protection. It will be 772b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * written into the block number saved in the s_mmp_block field in the 773b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * superblock. 774b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger */ 775b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 776b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 777b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 778b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger 779b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilgerstruct mmp_struct { 780b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u32 mmp_magic; 781b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u32 mmp_seq; 782b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u64 mmp_time; 783b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger char mmp_nodename[64]; 784b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger char mmp_bdevname[32]; 785b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u16 mmp_interval; 786b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u16 mmp_pad1; 787b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger __u32 mmp_pad2; 788b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger}; 789b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger 790b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger/* 791b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger * Interval in number of seconds to update the MMP sequence number. 792b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger */ 793b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger#define EXT2_MMP_DEF_INTERVAL 5 794b62e88af6a1be97b224a3e5c1fea43fa173567eaAndreas Dilger 7959f8046fc6dfc13eee2f5c363214e60b533872cacTheodore Ts'o#endif /* _LINUX_EXT2_FS_H */ 796