Root/fs/jfs/jfs_dinode.h

1/*
2 * Copyright (C) International Business Machines Corp., 2000-2001
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18#ifndef _H_JFS_DINODE
19#define _H_JFS_DINODE
20
21/*
22 * jfs_dinode.h: on-disk inode manager
23 */
24
25#define INODESLOTSIZE 128
26#define L2INODESLOTSIZE 7
27#define log2INODESIZE 9 /* log2(bytes per dinode) */
28
29
30/*
31 * on-disk inode : 512 bytes
32 *
33 * note: align 64-bit fields on 8-byte boundary.
34 */
35struct dinode {
36    /*
37     * I. base area (128 bytes)
38     * ------------------------
39     *
40     * define generic/POSIX attributes
41     */
42    __le32 di_inostamp; /* 4: stamp to show inode belongs to fileset */
43    __le32 di_fileset; /* 4: fileset number */
44    __le32 di_number; /* 4: inode number, aka file serial number */
45    __le32 di_gen; /* 4: inode generation number */
46
47    pxd_t di_ixpxd; /* 8: inode extent descriptor */
48
49    __le64 di_size; /* 8: size */
50    __le64 di_nblocks; /* 8: number of blocks allocated */
51
52    __le32 di_nlink; /* 4: number of links to the object */
53
54    __le32 di_uid; /* 4: user id of owner */
55    __le32 di_gid; /* 4: group id of owner */
56
57    __le32 di_mode; /* 4: attribute, format and permission */
58
59    struct timestruc_t di_atime; /* 8: time last data accessed */
60    struct timestruc_t di_ctime; /* 8: time last status changed */
61    struct timestruc_t di_mtime; /* 8: time last data modified */
62    struct timestruc_t di_otime; /* 8: time created */
63
64    dxd_t di_acl; /* 16: acl descriptor */
65
66    dxd_t di_ea; /* 16: ea descriptor */
67
68    __le32 di_next_index; /* 4: Next available dir_table index */
69
70    __le32 di_acltype; /* 4: Type of ACL */
71
72    /*
73     * Extension Areas.
74     *
75     * Historically, the inode was partitioned into 4 128-byte areas,
76     * the last 3 being defined as unions which could have multiple
77     * uses. The first 96 bytes had been completely unused until
78     * an index table was added to the directory. It is now more
79     * useful to describe the last 3/4 of the inode as a single
80     * union. We would probably be better off redesigning the
81     * entire structure from scratch, but we don't want to break
82     * commonality with OS/2's JFS at this time.
83     */
84    union {
85        struct {
86            /*
87             * This table contains the information needed to
88             * find a directory entry from a 32-bit index.
89             * If the index is small enough, the table is inline,
90             * otherwise, an x-tree root overlays this table
91             */
92            struct dir_table_slot _table[12]; /* 96: inline */
93
94            dtroot_t _dtroot; /* 288: dtree root */
95        } _dir; /* (384) */
96#define di_dirtable u._dir._table
97#define di_dtroot u._dir._dtroot
98#define di_parent di_dtroot.header.idotdot
99#define di_DASD di_dtroot.header.DASD
100
101        struct {
102            union {
103                u8 _data[96]; /* 96: unused */
104                struct {
105                    void *_imap; /* 4: unused */
106                    __le32 _gengen; /* 4: generator */
107                } _imap;
108            } _u1; /* 96: */
109#define di_gengen u._file._u1._imap._gengen
110
111            union {
112                xtpage_t _xtroot;
113                struct {
114                    u8 unused[16]; /* 16: */
115                    dxd_t _dxd; /* 16: */
116                    union {
117                        __le32 _rdev; /* 4: */
118                        u8 _fastsymlink[128];
119                    } _u;
120                    u8 _inlineea[128];
121                } _special;
122            } _u2;
123        } _file;
124#define di_xtroot u._file._u2._xtroot
125#define di_dxd u._file._u2._special._dxd
126#define di_btroot di_xtroot
127#define di_inlinedata u._file._u2._special._u
128#define di_rdev u._file._u2._special._u._rdev
129#define di_fastsymlink u._file._u2._special._u._fastsymlink
130#define di_inlineea u._file._u2._special._inlineea
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/* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */
170#define JFS_IOC_GETFLAGS _IOR('f', 1, long)
171#define JFS_IOC_SETFLAGS _IOW('f', 2, long)
172
173#define JFS_IOC_GETFLAGS32 _IOR('f', 1, int)
174#define JFS_IOC_SETFLAGS32 _IOW('f', 2, int)
175
176#endif /*_H_JFS_DINODE */
177

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