1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2009 Aditya Sarawgi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _FS_EXT2FS_EXT2_DINODE_H_ 32 #define _FS_EXT2FS_EXT2_DINODE_H_ 33 34 /* 35 * Special inode numbers 36 * The root inode is the root of the file system. Inode 0 can't be used for 37 * normal purposes and bad blocks are normally linked to inode 1, thus 38 * the root inode is 2. 39 * Inode 3 to 10 are reserved in ext2fs. 40 */ 41 #define EXT2_BADBLKINO ((ino_t)1) 42 #define EXT2_ROOTINO ((ino_t)2) 43 #define EXT2_ACLIDXINO ((ino_t)3) 44 #define EXT2_ACLDATAINO ((ino_t)4) 45 #define EXT2_BOOTLOADERINO ((ino_t)5) 46 #define EXT2_UNDELDIRINO ((ino_t)6) 47 #define EXT2_RESIZEINO ((ino_t)7) 48 #define EXT2_JOURNALINO ((ino_t)8) 49 #define EXT2_EXCLUDEINO ((ino_t)9) 50 #define EXT2_REPLICAINO ((ino_t)10) 51 #define EXT2_FIRSTINO ((ino_t)11) 52 53 /* 54 * Inode flags 55 * The system supports EXT2_IMMUTABLE, EXT2_APPEND and EXT2_NODUMP flags. 56 * The current implementation also uses EXT3_INDEX, EXT4_EXTENTS and 57 * EXT4_HUGE_FILE with some restrictions imposed by the lack of write 58 * support. 59 */ 60 #define EXT2_SECRM 0x00000001 /* Secure deletion */ 61 #define EXT2_UNRM 0x00000002 /* Undelete */ 62 #define EXT2_COMPR 0x00000004 /* Compress file */ 63 #define EXT2_SYNC 0x00000008 /* Synchronous updates */ 64 #define EXT2_IMMUTABLE 0x00000010 /* Immutable file */ 65 #define EXT2_APPEND 0x00000020 /* Writes to file may only append */ 66 #define EXT2_NODUMP 0x00000040 /* Do not dump file */ 67 #define EXT2_NOATIME 0x00000080 /* Do not update atime */ 68 #define EXT3_INDEX 0x00001000 /* Hash-indexed directory */ 69 #define EXT4_IMAGIC 0x00002000 /* AFS directory */ 70 #define EXT4_JOURNAL_DATA 0x00004000 /* File data should be journaled */ 71 #define EXT4_NOTAIL 0x00008000 /* File tail should not be merged */ 72 #define EXT4_DIRSYNC 0x00010000 /* Dirsync behaviour */ 73 #define EXT4_TOPDIR 0x00020000 /* Top of directory hierarchies*/ 74 #define EXT4_HUGE_FILE 0x00040000 /* Set to each huge file */ 75 #define EXT4_EXTENTS 0x00080000 /* Inode uses extents */ 76 #define EXT4_EA_INODE 0x00200000 /* Inode used for large EA */ 77 #define EXT4_EOFBLOCKS 0x00400000 /* Blocks allocated beyond EOF */ 78 #define EXT4_INLINE_DATA 0x10000000 /* Inode has inline data */ 79 #define EXT4_PROJINHERIT 0x20000000 /* Children inherit project ID */ 80 81 /* 82 * Definitions for nanosecond timestamps. 83 * Ext3 inode versioning, 2006-12-13. 84 */ 85 #define EXT3_EPOCH_BITS 2 86 #define EXT3_EPOCH_MASK ((1 << EXT3_EPOCH_BITS) - 1) 87 #define EXT3_NSEC_MASK (~0UL << EXT3_EPOCH_BITS) 88 89 #define E2DI_HAS_XTIME(ip) (EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, \ 90 EXT2F_ROCOMPAT_EXTRA_ISIZE)) 91 #define E2DI_HAS_HUGE_FILE(ip) (EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, \ 92 EXT2F_ROCOMPAT_HUGE_FILE)) 93 94 /* 95 * Constants relative to the data blocks 96 */ 97 #define EXT2_NDIR_BLOCKS 12 98 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 99 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 100 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 101 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 102 #define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof(uint32_t)) 103 104 /* 105 * Structure of an inode on the disk 106 */ 107 struct ext2fs_dinode { 108 uint16_t e2di_mode; /* 0: IFMT, permissions; see below. */ 109 uint16_t e2di_uid; /* 2: Owner UID */ 110 uint32_t e2di_size; /* 4: Size (in bytes) */ 111 uint32_t e2di_atime; /* 8: Access time */ 112 uint32_t e2di_ctime; /* 12: Change time */ 113 uint32_t e2di_mtime; /* 16: Modification time */ 114 uint32_t e2di_dtime; /* 20: Deletion time */ 115 uint16_t e2di_gid; /* 24: Owner GID */ 116 uint16_t e2di_nlink; /* 26: File link count */ 117 uint32_t e2di_nblock; /* 28: Blocks count */ 118 uint32_t e2di_flags; /* 32: Status flags (chflags) */ 119 uint32_t e2di_version; /* 36: Low 32 bits inode version */ 120 uint32_t e2di_blocks[EXT2_N_BLOCKS]; /* 40: disk blocks */ 121 uint32_t e2di_gen; /* 100: generation number */ 122 uint32_t e2di_facl; /* 104: Low EA block */ 123 uint32_t e2di_size_high; /* 108: Upper bits of file size */ 124 uint32_t e2di_faddr; /* 112: Fragment address (obsolete) */ 125 uint16_t e2di_nblock_high; /* 116: Blocks count bits 47:32 */ 126 uint16_t e2di_facl_high; /* 118: File EA bits 47:32 */ 127 uint16_t e2di_uid_high; /* 120: Owner UID top 16 bits */ 128 uint16_t e2di_gid_high; /* 122: Owner GID top 16 bits */ 129 uint16_t e2di_chksum_lo; /* 124: Lower inode checksum */ 130 uint16_t e2di_lx_reserved; /* 126: Unused */ 131 uint16_t e2di_extra_isize; /* 128: Size of this inode */ 132 uint16_t e2di_chksum_hi; /* 130: High inode checksum */ 133 uint32_t e2di_ctime_extra; /* 132: Extra change time */ 134 uint32_t e2di_mtime_extra; /* 136: Extra modification time */ 135 uint32_t e2di_atime_extra; /* 140: Extra access time */ 136 uint32_t e2di_crtime; /* 144: Creation (birth)time */ 137 uint32_t e2di_crtime_extra; /* 148: Extra creation (birth)time */ 138 uint32_t e2di_version_hi; /* 152: High bits of inode version */ 139 uint32_t e2di_projid; /* 156: Project ID */ 140 }; 141 142 #endif /* !_FS_EXT2FS_EXT2_DINODE_H_ */ 143