jfs_dinode.h (5097B)
1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Copyright (C) International Business Machines Corp., 2000-2001 4 */ 5#ifndef _H_JFS_DINODE 6#define _H_JFS_DINODE 7 8/* 9 * jfs_dinode.h: on-disk inode manager 10 */ 11 12#define INODESLOTSIZE 128 13#define L2INODESLOTSIZE 7 14#define log2INODESIZE 9 /* log2(bytes per dinode) */ 15 16 17/* 18 * on-disk inode : 512 bytes 19 * 20 * note: align 64-bit fields on 8-byte boundary. 21 */ 22struct dinode { 23 /* 24 * I. base area (128 bytes) 25 * ------------------------ 26 * 27 * define generic/POSIX attributes 28 */ 29 __le32 di_inostamp; /* 4: stamp to show inode belongs to fileset */ 30 __le32 di_fileset; /* 4: fileset number */ 31 __le32 di_number; /* 4: inode number, aka file serial number */ 32 __le32 di_gen; /* 4: inode generation number */ 33 34 pxd_t di_ixpxd; /* 8: inode extent descriptor */ 35 36 __le64 di_size; /* 8: size */ 37 __le64 di_nblocks; /* 8: number of blocks allocated */ 38 39 __le32 di_nlink; /* 4: number of links to the object */ 40 41 __le32 di_uid; /* 4: user id of owner */ 42 __le32 di_gid; /* 4: group id of owner */ 43 44 __le32 di_mode; /* 4: attribute, format and permission */ 45 46 struct timestruc_t di_atime; /* 8: time last data accessed */ 47 struct timestruc_t di_ctime; /* 8: time last status changed */ 48 struct timestruc_t di_mtime; /* 8: time last data modified */ 49 struct timestruc_t di_otime; /* 8: time created */ 50 51 dxd_t di_acl; /* 16: acl descriptor */ 52 53 dxd_t di_ea; /* 16: ea descriptor */ 54 55 __le32 di_next_index; /* 4: Next available dir_table index */ 56 57 __le32 di_acltype; /* 4: Type of ACL */ 58 59 /* 60 * Extension Areas. 61 * 62 * Historically, the inode was partitioned into 4 128-byte areas, 63 * the last 3 being defined as unions which could have multiple 64 * uses. The first 96 bytes had been completely unused until 65 * an index table was added to the directory. It is now more 66 * useful to describe the last 3/4 of the inode as a single 67 * union. We would probably be better off redesigning the 68 * entire structure from scratch, but we don't want to break 69 * commonality with OS/2's JFS at this time. 70 */ 71 union { 72 struct { 73 /* 74 * This table contains the information needed to 75 * find a directory entry from a 32-bit index. 76 * If the index is small enough, the table is inline, 77 * otherwise, an x-tree root overlays this table 78 */ 79 struct dir_table_slot _table[12]; /* 96: inline */ 80 81 dtroot_t _dtroot; /* 288: dtree root */ 82 } _dir; /* (384) */ 83#define di_dirtable u._dir._table 84#define di_dtroot u._dir._dtroot 85#define di_parent di_dtroot.header.idotdot 86#define di_DASD di_dtroot.header.DASD 87 88 struct { 89 union { 90 u8 _data[96]; /* 96: unused */ 91 struct { 92 void *_imap; /* 4: unused */ 93 __le32 _gengen; /* 4: generator */ 94 } _imap; 95 } _u1; /* 96: */ 96#define di_gengen u._file._u1._imap._gengen 97 98 union { 99 xtpage_t _xtroot; 100 struct { 101 u8 unused[16]; /* 16: */ 102 dxd_t _dxd; /* 16: */ 103 union { 104 /* 105 * The fast symlink area 106 * is expected to overflow 107 * into _inlineea when 108 * needed (which will clear 109 * INLINEEA). 110 */ 111 struct { 112 union { 113 __le32 _rdev; /* 4: */ 114 u8 _fastsymlink[128]; 115 } _u; 116 u8 _inlineea[128]; 117 }; 118 u8 _inline_all[256]; 119 }; 120 } _special; 121 } _u2; 122 } _file; 123#define di_xtroot u._file._u2._xtroot 124#define di_dxd u._file._u2._special._dxd 125#define di_btroot di_xtroot 126#define di_inlinedata u._file._u2._special._u 127#define di_rdev u._file._u2._special._u._rdev 128#define di_fastsymlink u._file._u2._special._u._fastsymlink 129#define di_inlineea u._file._u2._special._inlineea 130#define di_inline_all u._file._u2._special._inline_all 131 } u; 132}; 133 134/* extended mode bits (on-disk inode di_mode) */ 135#define IFJOURNAL 0x00010000 /* journalled file */ 136#define ISPARSE 0x00020000 /* sparse file enabled */ 137#define INLINEEA 0x00040000 /* inline EA area free */ 138#define ISWAPFILE 0x00800000 /* file open for pager swap space */ 139 140/* more extended mode bits: attributes for OS/2 */ 141#define IREADONLY 0x02000000 /* no write access to file */ 142#define IHIDDEN 0x04000000 /* hidden file */ 143#define ISYSTEM 0x08000000 /* system file */ 144 145#define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */ 146#define IARCHIVE 0x40000000 /* file archive bit */ 147#define INEWNAME 0x80000000 /* non-8.3 filename format */ 148 149#define IRASH 0x4E000000 /* mask for changeable attributes */ 150#define ATTRSHIFT 25 /* bits to shift to move attribute 151 specification to mode position */ 152 153/* extended attributes for Linux */ 154 155#define JFS_NOATIME_FL 0x00080000 /* do not update atime */ 156 157#define JFS_DIRSYNC_FL 0x00100000 /* dirsync behaviour */ 158#define JFS_SYNC_FL 0x00200000 /* Synchronous updates */ 159#define JFS_SECRM_FL 0x00400000 /* Secure deletion */ 160#define JFS_UNRM_FL 0x00800000 /* allow for undelete */ 161 162#define JFS_APPEND_FL 0x01000000 /* writes to file may only append */ 163#define JFS_IMMUTABLE_FL 0x02000000 /* Immutable file */ 164 165#define JFS_FL_USER_VISIBLE 0x03F80000 166#define JFS_FL_USER_MODIFIABLE 0x03F80000 167#define JFS_FL_INHERIT 0x03C80000 168 169#endif /*_H_JFS_DINODE */