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