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 */
22 struct 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 xtroot_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 */
170
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