ext2_fs.h revision 89efc88e65136ece22708cc28ec4124a33feeecd
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * linux/include/linux/ext2_fs.h 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright (C) 1992, 1993, 1994, 1995 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Remy Card (card@masi.ibp.fr) 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Laboratoire MASI - Institut Blaise Pascal 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Universite Pierre et Marie Curie (Paris VI) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * from 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * linux/include/linux/minix_fs.h 12868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) * 13868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) * Copyright (C) 1991, 1992 Linus Torvalds 14c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef _LINUX_EXT2_FS_H 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define _LINUX_EXT2_FS_H 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <ext2fs/ext2_types.h> /* Changed from linux/types.h */ 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 21c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)/* 22c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * The second extended filesystem constants/structures 23c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 24c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 25a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)/* 26a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) * Define EXT2FS_DEBUG to produce debug messages 2703b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) */ 28a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#undef EXT2FS_DEBUG 29a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 30a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)/* 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_PREALLOCATE 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DEFAULT_PREALLOC_BLOCKS 8 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The second extended file system version 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2FS_DATE "95/08/09" 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2FS_VERSION "0.5b" 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Special inode numbers 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BAD_INO 1 /* Bad blocks inode */ 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_ROOT_INO 2 /* Root inode */ 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT4_USR_QUOTA_INO 3 /* User quota inode */ 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */ 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_JOURNAL_INO 8 /* Journal inode */ 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */ 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* First non-reserved inode for old ext2 filesystems */ 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_GOOD_OLD_FIRST_INO 11 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The second extended file system magic number 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define EXT2_SUPER_MAGIC 0xEF53 62c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef __KERNEL__ 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 65a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#else 66a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)/* Assume that user mode programs are passing in an ext2fs superblock, not 67a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) * a kernel struct super_block. This will allow us to call the feature-test 68a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) * macros from user land. */ 69a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_SB(sb) (sb) 70a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#endif 71a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 72a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)/* 73a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) * Maximal count of links to a file 74a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) */ 75a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_LINK_MAX 65000 76a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 77a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)/* 78a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) * Macro-instructions used to manage several block sizes 79a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) */ 80a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 81a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 82a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 83a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 84a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#ifdef __KERNEL__ 85a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 86a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 87a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 88a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 89a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 98c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 997dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch 100a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)/* 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Macro-instructions used to manage allocation clusters 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MIN_CLUSTER_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 104c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define EXT2_MAX_CLUSTER_LOG_SIZE 29 /* 512MB */ 105c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define EXT2_MIN_CLUSTER_SIZE EXT2_MIN_BLOCK_SIZE 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MAX_CLUSTER_SIZE (1 << EXT2_MAX_CLUSTER_LOG_SIZE) 107a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_CLUSTER_SIZE(s) (EXT2_MIN_BLOCK_SIZE << \ 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (s)->s_log_cluster_size) 109a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define EXT2_CLUSTER_SIZE_BITS(s) ((s)->s_log_cluster_size + 10) 110a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles) 111a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)/* 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Macro-instructions used to manage fragments 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Note: for backwards compatibility only, for the dump program. 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Ext2/3/4 will never support fragments.... 116a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) */ 117a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 118a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 119a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 120a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#define EXT2_FRAG_SIZE(s) EXT2_BLOCK_SIZE(s) 121a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#define EXT2_FRAGS_PER_BLOCK(s) 1 122a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ACL structures 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_acl_header /* Header of Access Control Lists */ 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 aclh_size; 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 aclh_file_count; 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 aclh_acle_count; 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 aclh_first_acle; 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_acl_entry /* Access Control List Entry */ 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 acle_size; 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 acle_perms; /* Access permissions */ 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 acle_type; /* Type of entry */ 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 acle_tag; /* User or group identity */ 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 acle_pad1; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 acle_next; /* Pointer on next entry for the */ 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* same inode or on next free entry */ 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Structure of a blocks group descriptor 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_group_desc 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_block_bitmap; /* Blocks bitmap block */ 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_inode_bitmap; /* Inodes bitmap block */ 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_inode_table; /* Inodes table block */ 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_free_blocks_count; /* Free blocks count */ 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_free_inodes_count; /* Free inodes count */ 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_used_dirs_count; /* Directories count */ 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_flags; 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_itable_unused; /* Unused inodes count */ 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Structure of a blocks group descriptor 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext4_group_desc 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_block_bitmap; /* Blocks bitmap block */ 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_inode_bitmap; /* Inodes bitmap block */ 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_inode_table; /* Inodes table block */ 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_free_blocks_count; /* Free blocks count */ 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_free_inodes_count; /* Free inodes count */ 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_used_dirs_count; /* Directories count */ 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */ 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */ 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_itable_unused; /* Unused inodes count */ 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_inode_table_hi; /* Inodes table block MSB */ 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_used_dirs_count_hi; /* Directories count MSB */ 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_itable_unused_hi; /* Unused inodes count MSB */ 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */ 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */ 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 bg_reserved; 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Data structures used by the directory indexing feature 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Note: all of the multibyte integer fields are little endian. 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Note: dx_root_info is laid out so that if it should somehow get 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * overlaid by a dirent the two low bits of the hash version will be 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * zero. Therefore, the hash version mod 4 should never be 0. 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Sincerely, the paranoia department. 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_dx_root_info { 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 reserved_zero; 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u8 hash_version; /* 0 now, 1 at release */ 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u8 info_length; /* 8 */ 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u8 indirect_levels; 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u8 unused_flags; 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_LEGACY 0 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_HALF_MD4 1 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_TEA 2 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */ 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */ 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */ 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_HASH_FLAG_INCOMPAT 0x1 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_dx_entry { 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 hash; 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 block; 2302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)}; 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_dx_countlimit { 2332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) __u16 limit; 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u16 count; 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 2362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Macro-instructions used to manage group descriptors 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MIN_DESC_SIZE 32 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MIN_DESC_SIZE_64BIT 64 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MAX_DESC_SIZE EXT2_MIN_BLOCK_SIZE 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DESC_SIZE(s) \ 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \ 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (s)->s_desc_size : EXT2_MIN_DESC_SIZE) 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_SB(s)->s_clusters_per_group) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((((unsigned) 1 << 16) - 8) * \ 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (EXT2_CLUSTER_SIZE(s) / \ 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EXT2_BLOCK_SIZE(s))) 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MAX_CLUSTERS_PER_GROUP(s) (((unsigned) 1 << 16) - 8) 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_MAX_INODES_PER_GROUP(s) (((unsigned) 1 << 16) - \ 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EXT2_INODES_PER_BLOCK(s)) 2592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifdef __KERNEL__ 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s)) 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Constants relative to the data blocks 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_NDIR_BLOCKS 12 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Inode flags 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Reserved for compression usage... */ 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DIRTY_FL 0x00000100 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* End compression flags --- maybe not all used */ 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_IMAGIC_FL 0x00002000 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 302d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles)#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 303d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles)#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */ 304d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles)#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */ 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */ 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define EXT2_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ioctl commands 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Used for online resize */ 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct ext2_new_group_input { 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __u32 group; /* Group number for this data */ 318 __u32 block_bitmap; /* Absolute block number of block bitmap */ 319 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 320 __u32 inode_table; /* Absolute block number of inode table start */ 321 __u32 blocks_count; /* Total number of blocks in this group */ 322 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 323 __u16 unused; /* Number of reserved GDT blocks in group */ 324}; 325 326struct ext4_new_group_input { 327 __u32 group; /* Group number for this data */ 328 __u64 block_bitmap; /* Absolute block number of block bitmap */ 329 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 330 __u64 inode_table; /* Absolute block number of inode table start */ 331 __u32 blocks_count; /* Total number of blocks in this group */ 332 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 333 __u16 unused; 334}; 335 336#ifdef __GNU__ /* Needed for the Hurd */ 337#define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0) 338#endif 339 340#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 341#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 342#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 343#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 344#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 345#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 346#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 347#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 348#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 349#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64) 350 351/* 352 * Structure of an inode on the disk 353 */ 354struct ext2_inode { 355 __u16 i_mode; /* File mode */ 356 __u16 i_uid; /* Low 16 bits of Owner Uid */ 357 __u32 i_size; /* Size in bytes */ 358 __u32 i_atime; /* Access time */ 359 __u32 i_ctime; /* Inode change time */ 360 __u32 i_mtime; /* Modification time */ 361 __u32 i_dtime; /* Deletion Time */ 362 __u16 i_gid; /* Low 16 bits of Group Id */ 363 __u16 i_links_count; /* Links count */ 364 __u32 i_blocks; /* Blocks count */ 365 __u32 i_flags; /* File flags */ 366 union { 367 struct { 368 __u32 l_i_version; /* was l_i_reserved1 */ 369 } linux1; 370 struct { 371 __u32 h_i_translator; 372 } hurd1; 373 } osd1; /* OS dependent 1 */ 374 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 375 __u32 i_generation; /* File version (for NFS) */ 376 __u32 i_file_acl; /* File ACL */ 377 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 378 __u32 i_faddr; /* Fragment address */ 379 union { 380 struct { 381 __u16 l_i_blocks_hi; 382 __u16 l_i_file_acl_high; 383 __u16 l_i_uid_high; /* these 2 fields */ 384 __u16 l_i_gid_high; /* were reserved2[0] */ 385 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 386 __u16 l_i_reserved; /* crc32c(uuid+inum+inode) */ 387 } linux2; 388 struct { 389 __u8 h_i_frag; /* Fragment number */ 390 __u8 h_i_fsize; /* Fragment size */ 391 __u16 h_i_mode_high; 392 __u16 h_i_uid_high; 393 __u16 h_i_gid_high; 394 __u32 h_i_author; 395 } hurd2; 396 } osd2; /* OS dependent 2 */ 397}; 398 399/* 400 * Permanent part of an large inode on the disk 401 */ 402struct ext2_inode_large { 403 __u16 i_mode; /* File mode */ 404 __u16 i_uid; /* Low 16 bits of Owner Uid */ 405 __u32 i_size; /* Size in bytes */ 406 __u32 i_atime; /* Access time */ 407 __u32 i_ctime; /* Inode Change time */ 408 __u32 i_mtime; /* Modification time */ 409 __u32 i_dtime; /* Deletion Time */ 410 __u16 i_gid; /* Low 16 bits of Group Id */ 411 __u16 i_links_count; /* Links count */ 412 __u32 i_blocks; /* Blocks count */ 413 __u32 i_flags; /* File flags */ 414 union { 415 struct { 416 __u32 l_i_version; /* was l_i_reserved1 */ 417 } linux1; 418 struct { 419 __u32 h_i_translator; 420 } hurd1; 421 } osd1; /* OS dependent 1 */ 422 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 423 __u32 i_generation; /* File version (for NFS) */ 424 __u32 i_file_acl; /* File ACL */ 425 __u32 i_size_high; /* Formerly i_dir_acl, directory ACL */ 426 __u32 i_faddr; /* Fragment address */ 427 union { 428 struct { 429 __u16 l_i_blocks_hi; 430 __u16 l_i_file_acl_high; 431 __u16 l_i_uid_high; /* these 2 fields */ 432 __u16 l_i_gid_high; /* were reserved2[0] */ 433 __u16 l_i_checksum_lo; /* crc32c(uuid+inum+inode) */ 434 __u16 l_i_reserved; 435 } linux2; 436 struct { 437 __u8 h_i_frag; /* Fragment number */ 438 __u8 h_i_fsize; /* Fragment size */ 439 __u16 h_i_mode_high; 440 __u16 h_i_uid_high; 441 __u16 h_i_gid_high; 442 __u32 h_i_author; 443 } hurd2; 444 } osd2; /* OS dependent 2 */ 445 __u16 i_extra_isize; 446 __u16 i_checksum_hi; /* crc32c(uuid+inum+inode) */ 447 __u32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 448 __u32 i_mtime_extra; /* extra Modification time (nsec << 2 | epoch) */ 449 __u32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 450 __u32 i_crtime; /* File creation time */ 451 __u32 i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/ 452 __u32 i_version_hi; /* high 32 bits for 64-bit version */ 453}; 454 455#define i_dir_acl i_size_high 456 457#if defined(__KERNEL__) || defined(__linux__) 458#define i_reserved1 osd1.linux1.l_i_reserved1 459#define i_frag osd2.linux2.l_i_frag 460#define i_fsize osd2.linux2.l_i_fsize 461#define i_uid_low i_uid 462#define i_gid_low i_gid 463#define i_uid_high osd2.linux2.l_i_uid_high 464#define i_gid_high osd2.linux2.l_i_gid_high 465#define i_checksum osd2.linux2.l_i_checksum 466#else 467#if defined(__GNU__) 468 469#define i_translator osd1.hurd1.h_i_translator 470#define i_frag osd2.hurd2.h_i_frag; 471#define i_fsize osd2.hurd2.h_i_fsize; 472#define i_uid_high osd2.hurd2.h_i_uid_high 473#define i_gid_high osd2.hurd2.h_i_gid_high 474#define i_author osd2.hurd2.h_i_author 475 476#endif /* __GNU__ */ 477#endif /* defined(__KERNEL__) || defined(__linux__) */ 478 479#define inode_uid(inode) ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16) 480#define inode_gid(inode) ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16) 481#define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x)) 482#define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x)) 483 484/* 485 * File system states 486 */ 487#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 488#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 489#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */ 490 491/* 492 * Misc. filesystem flags 493 */ 494#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 495#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 496#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */ 497#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */ 498#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */ 499#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */ 500 501/* 502 * Mount flags 503 */ 504#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 505#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 506#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 507#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 508#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 509#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 510#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 511#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 512 513#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 514#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 515#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 516 EXT2_MOUNT_##opt) 517/* 518 * Maximal mount counts between two filesystem checks 519 */ 520#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 521#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 522 523/* 524 * Behaviour when detecting errors 525 */ 526#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 527#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 528#define EXT2_ERRORS_PANIC 3 /* Panic */ 529#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 530 531#if (__GNUC__ >= 4) 532#define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER) 533#else 534#define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 535#endif 536 537/* 538 * Structure of the super block 539 */ 540struct ext2_super_block { 541 __u32 s_inodes_count; /* Inodes count */ 542 __u32 s_blocks_count; /* Blocks count */ 543 __u32 s_r_blocks_count; /* Reserved blocks count */ 544 __u32 s_free_blocks_count; /* Free blocks count */ 545 __u32 s_free_inodes_count; /* Free inodes count */ 546 __u32 s_first_data_block; /* First Data Block */ 547 __u32 s_log_block_size; /* Block size */ 548 __u32 s_log_cluster_size; /* Allocation cluster size */ 549 __u32 s_blocks_per_group; /* # Blocks per group */ 550 __u32 s_clusters_per_group; /* # Fragments per group */ 551 __u32 s_inodes_per_group; /* # Inodes per group */ 552 __u32 s_mtime; /* Mount time */ 553 __u32 s_wtime; /* Write time */ 554 __u16 s_mnt_count; /* Mount count */ 555 __s16 s_max_mnt_count; /* Maximal mount count */ 556 __u16 s_magic; /* Magic signature */ 557 __u16 s_state; /* File system state */ 558 __u16 s_errors; /* Behaviour when detecting errors */ 559 __u16 s_minor_rev_level; /* minor revision level */ 560 __u32 s_lastcheck; /* time of last check */ 561 __u32 s_checkinterval; /* max. time between checks */ 562 __u32 s_creator_os; /* OS */ 563 __u32 s_rev_level; /* Revision level */ 564 __u16 s_def_resuid; /* Default uid for reserved blocks */ 565 __u16 s_def_resgid; /* Default gid for reserved blocks */ 566 /* 567 * These fields are for EXT2_DYNAMIC_REV superblocks only. 568 * 569 * Note: the difference between the compatible feature set and 570 * the incompatible feature set is that if there is a bit set 571 * in the incompatible feature set that the kernel doesn't 572 * know about, it should refuse to mount the filesystem. 573 * 574 * e2fsck's requirements are more strict; if it doesn't know 575 * about a feature in either the compatible or incompatible 576 * feature set, it must abort and not try to meddle with 577 * things it doesn't understand... 578 */ 579 __u32 s_first_ino; /* First non-reserved inode */ 580 __u16 s_inode_size; /* size of inode structure */ 581 __u16 s_block_group_nr; /* block group # of this superblock */ 582 __u32 s_feature_compat; /* compatible feature set */ 583 __u32 s_feature_incompat; /* incompatible feature set */ 584 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 585 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 586 char s_volume_name[16]; /* volume name */ 587 char s_last_mounted[64]; /* directory where last mounted */ 588 __u32 s_algorithm_usage_bitmap; /* For compression */ 589 /* 590 * Performance hints. Directory preallocation should only 591 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 592 */ 593 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 594 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 595 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 596 /* 597 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 598 */ 599 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 600 __u32 s_journal_inum; /* inode number of journal file */ 601 __u32 s_journal_dev; /* device number of journal file */ 602 __u32 s_last_orphan; /* start of list of inodes to delete */ 603 __u32 s_hash_seed[4]; /* HTREE hash seed */ 604 __u8 s_def_hash_version; /* Default hash version to use */ 605 __u8 s_jnl_backup_type; /* Default type of journal backup */ 606 __u16 s_desc_size; /* Group desc. size: INCOMPAT_64BIT */ 607 __u32 s_default_mount_opts; 608 __u32 s_first_meta_bg; /* First metablock group */ 609 __u32 s_mkfs_time; /* When the filesystem was created */ 610 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 611 __u32 s_blocks_count_hi; /* Blocks count high 32bits */ 612 __u32 s_r_blocks_count_hi; /* Reserved blocks count high 32 bits*/ 613 __u32 s_free_blocks_hi; /* Free blocks count */ 614 __u16 s_min_extra_isize; /* All inodes have at least # bytes */ 615 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */ 616 __u32 s_flags; /* Miscellaneous flags */ 617 __u16 s_raid_stride; /* RAID stride */ 618 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */ 619 __u64 s_mmp_block; /* Block for multi-mount protection */ 620 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 621 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 622 __u8 s_reserved_char_pad; 623 __u16 s_reserved_pad; /* Padding to next 32bits */ 624 __u64 s_kbytes_written; /* nr of lifetime kilobytes written */ 625 __u32 s_snapshot_inum; /* Inode number of active snapshot */ 626 __u32 s_snapshot_id; /* sequential ID of active snapshot */ 627 __u64 s_snapshot_r_blocks_count; /* reserved blocks for active 628 snapshot's future use */ 629 __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */ 630#define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count) 631 __u32 s_error_count; /* number of fs errors */ 632 __u32 s_first_error_time; /* first time an error happened */ 633 __u32 s_first_error_ino; /* inode involved in first error */ 634 __u64 s_first_error_block; /* block involved of first error */ 635 __u8 s_first_error_func[32]; /* function where the error happened */ 636 __u32 s_first_error_line; /* line number where error happened */ 637 __u32 s_last_error_time; /* most recent time of an error */ 638 __u32 s_last_error_ino; /* inode involved in last error */ 639 __u32 s_last_error_line; /* line number where error happened */ 640 __u64 s_last_error_block; /* block involved of last error */ 641 __u8 s_last_error_func[32]; /* function where the error happened */ 642#define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts) 643 __u8 s_mount_opts[64]; 644 __u32 s_usr_quota_inum; /* inode number of user quota file */ 645 __u32 s_grp_quota_inum; /* inode number of group quota file */ 646 __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */ 647 __u32 s_checksum; /* crc32c(superblock) */ 648 __u32 s_reserved[108]; /* Padding to the end of the block */ 649}; 650 651#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 652 653/* 654 * Codes for operating systems 655 */ 656#define EXT2_OS_LINUX 0 657#define EXT2_OS_HURD 1 658#define EXT2_OBSO_OS_MASIX 2 659#define EXT2_OS_FREEBSD 3 660#define EXT2_OS_LITES 4 661 662/* 663 * Revision levels 664 */ 665#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 666#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 667 668#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 669#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 670 671#define EXT2_GOOD_OLD_INODE_SIZE 128 672 673/* 674 * Journal inode backup types 675 */ 676#define EXT3_JNL_BACKUP_BLOCKS 1 677 678/* 679 * Feature set definitions 680 */ 681 682#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 683 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 684#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 685 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 686#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 687 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 688 689#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 690#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 691#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 692#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 693#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 694#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 695#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 696/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */ 697#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100 698 699 700#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 701#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 702/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 703#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 704#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 705#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 706#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 707#define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080 708#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100 709#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200 710#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 711 712#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 713#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 714#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 715#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 716#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 717#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 718#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 719#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 720#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 721#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 722#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 723 724#define EXT2_FEATURE_COMPAT_SUPP 0 725#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 726#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 727 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 728 EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ 729 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 730 731/* 732 * Default values for user and/or group using reserved blocks 733 */ 734#define EXT2_DEF_RESUID 0 735#define EXT2_DEF_RESGID 0 736 737/* 738 * Default mount options 739 */ 740#define EXT2_DEFM_DEBUG 0x0001 741#define EXT2_DEFM_BSDGROUPS 0x0002 742#define EXT2_DEFM_XATTR_USER 0x0004 743#define EXT2_DEFM_ACL 0x0008 744#define EXT2_DEFM_UID16 0x0010 745#define EXT3_DEFM_JMODE 0x0060 746#define EXT3_DEFM_JMODE_DATA 0x0020 747#define EXT3_DEFM_JMODE_ORDERED 0x0040 748#define EXT3_DEFM_JMODE_WBACK 0x0060 749#define EXT4_DEFM_NOBARRIER 0x0100 750#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 751#define EXT4_DEFM_DISCARD 0x0400 752#define EXT4_DEFM_NODELALLOC 0x0800 753 754/* 755 * Structure of a directory entry 756 */ 757#define EXT2_NAME_LEN 255 758 759struct ext2_dir_entry { 760 __u32 inode; /* Inode number */ 761 __u16 rec_len; /* Directory entry length */ 762 __u16 name_len; /* Name length */ 763 char name[EXT2_NAME_LEN]; /* File name */ 764}; 765 766/* 767 * The new version of the directory entry. Since EXT2 structures are 768 * stored in intel byte order, and the name_len field could never be 769 * bigger than 255 chars, it's safe to reclaim the extra byte for the 770 * file_type field. 771 */ 772struct ext2_dir_entry_2 { 773 __u32 inode; /* Inode number */ 774 __u16 rec_len; /* Directory entry length */ 775 __u8 name_len; /* Name length */ 776 __u8 file_type; 777 char name[EXT2_NAME_LEN]; /* File name */ 778}; 779 780/* 781 * Ext2 directory file types. Only the low 3 bits are used. The 782 * other bits are reserved for now. 783 */ 784#define EXT2_FT_UNKNOWN 0 785#define EXT2_FT_REG_FILE 1 786#define EXT2_FT_DIR 2 787#define EXT2_FT_CHRDEV 3 788#define EXT2_FT_BLKDEV 4 789#define EXT2_FT_FIFO 5 790#define EXT2_FT_SOCK 6 791#define EXT2_FT_SYMLINK 7 792 793#define EXT2_FT_MAX 8 794 795/* 796 * EXT2_DIR_PAD defines the directory entries boundaries 797 * 798 * NOTE: It must be a multiple of 4 799 */ 800#define EXT2_DIR_PAD 4 801#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 802#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 803 ~EXT2_DIR_ROUND) 804 805/* 806 * This structure will be used for multiple mount protection. It will be 807 * written into the block number saved in the s_mmp_block field in the 808 * superblock. 809 */ 810#define EXT2_MMP_MAGIC 0x004D4D50 /* ASCII for MMP */ 811#define EXT2_MMP_CLEAN 0xFF4D4D50 /* Value of mmp_seq for clean unmount */ 812#define EXT2_MMP_FSCK_ON 0xE24D4D50 /* Value of mmp_seq when being fscked */ 813 814struct mmp_struct { 815 __u32 mmp_magic; 816 __u32 mmp_seq; 817 __u64 mmp_time; 818 char mmp_nodename[64]; 819 char mmp_bdevname[32]; 820 __u16 mmp_interval; 821 __u16 mmp_pad1; 822 __u32 mmp_pad2; 823}; 824 825/* 826 * Interval in number of seconds to update the MMP sequence number. 827 */ 828#define EXT2_MMP_DEF_INTERVAL 5 829 830#endif /* _LINUX_EXT2_FS_H */ 831