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  */
35 struct 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 						/*
119 						 * The fast symlink area
120 						 * is expected to overflow
121 						 * into _inlineea when
122 						 * needed (which will clear
123 						 * INLINEEA).
124 						 */
125 						u8 _fastsymlink[128];
126 					} _u;
127 					u8 _inlineea[128];
128 				} _special;
129 			} _u2;
130 		} _file;
131 #define di_xtroot	u._file._u2._xtroot
132 #define di_dxd		u._file._u2._special._dxd
133 #define di_btroot	di_xtroot
134 #define di_inlinedata	u._file._u2._special._u
135 #define di_rdev		u._file._u2._special._u._rdev
136 #define di_fastsymlink	u._file._u2._special._u._fastsymlink
137 #define di_inlineea	u._file._u2._special._inlineea
138 	} u;
139 };
140 
141 /* extended mode bits (on-disk inode di_mode) */
142 #define IFJOURNAL	0x00010000	/* journalled file */
143 #define ISPARSE		0x00020000	/* sparse file enabled */
144 #define INLINEEA	0x00040000	/* inline EA area free */
145 #define ISWAPFILE	0x00800000	/* file open for pager swap space */
146 
147 /* more extended mode bits: attributes for OS/2 */
148 #define IREADONLY	0x02000000	/* no write access to file */
149 #define IHIDDEN		0x04000000	/* hidden file */
150 #define ISYSTEM		0x08000000	/* system file */
151 
152 #define IDIRECTORY	0x20000000	/* directory (shadow of real bit) */
153 #define IARCHIVE	0x40000000	/* file archive bit */
154 #define INEWNAME	0x80000000	/* non-8.3 filename format */
155 
156 #define IRASH		0x4E000000	/* mask for changeable attributes */
157 #define ATTRSHIFT	25	/* bits to shift to move attribute
158 				   specification to mode position */
159 
160 /* extended attributes for Linux */
161 
162 #define JFS_NOATIME_FL		0x00080000 /* do not update atime */
163 
164 #define JFS_DIRSYNC_FL		0x00100000 /* dirsync behaviour */
165 #define JFS_SYNC_FL		0x00200000 /* Synchronous updates */
166 #define JFS_SECRM_FL		0x00400000 /* Secure deletion */
167 #define JFS_UNRM_FL		0x00800000 /* allow for undelete */
168 
169 #define JFS_APPEND_FL		0x01000000 /* writes to file may only append */
170 #define JFS_IMMUTABLE_FL	0x02000000 /* Immutable file */
171 
172 #define JFS_FL_USER_VISIBLE	0x03F80000
173 #define JFS_FL_USER_MODIFIABLE	0x03F80000
174 #define JFS_FL_INHERIT		0x03C80000
175 
176 /* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */
177 #define JFS_IOC_GETFLAGS	_IOR('f', 1, long)
178 #define JFS_IOC_SETFLAGS	_IOW('f', 2, long)
179 
180 #define JFS_IOC_GETFLAGS32	_IOR('f', 1, int)
181 #define JFS_IOC_SETFLAGS32	_IOW('f', 2, int)
182 
183 #endif /*_H_JFS_DINODE */
184