1 /*
2  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * 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 the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #ifndef __XFS_DINODE_H__
19 #define	__XFS_DINODE_H__
20 
21 #define	XFS_DINODE_MAGIC		0x494e	/* 'IN' */
22 #define XFS_DINODE_GOOD_VERSION(v)	(((v) == 1 || (v) == 2))
23 
24 typedef struct xfs_timestamp {
25 	__be32		t_sec;		/* timestamp seconds */
26 	__be32		t_nsec;		/* timestamp nanoseconds */
27 } xfs_timestamp_t;
28 
29 /*
30  * On-disk inode structure.
31  *
32  * This is just the header or "dinode core", the inode is expanded to fill a
33  * variable size the leftover area split into a data and an attribute fork.
34  * The format of the data and attribute fork depends on the format of the
35  * inode as indicated by di_format and di_aformat.  To access the data and
36  * attribute use the XFS_DFORK_PTR, XFS_DFORK_DPTR, and XFS_DFORK_PTR macros
37  * below.
38  *
39  * There is a very similar struct icdinode in xfs_inode which matches the
40  * layout of the first 96 bytes of this structure, but is kept in native
41  * format instead of big endian.
42  */
43 typedef struct xfs_dinode {
44 	__be16		di_magic;	/* inode magic # = XFS_DINODE_MAGIC */
45 	__be16		di_mode;	/* mode and type of file */
46 	__u8		di_version;	/* inode version */
47 	__u8		di_format;	/* format of di_c data */
48 	__be16		di_onlink;	/* old number of links to file */
49 	__be32		di_uid;		/* owner's user id */
50 	__be32		di_gid;		/* owner's group id */
51 	__be32		di_nlink;	/* number of links to file */
52 	__be16		di_projid_lo;	/* lower part of owner's project id */
53 	__be16		di_projid_hi;	/* higher part owner's project id */
54 	__u8		di_pad[6];	/* unused, zeroed space */
55 	__be16		di_flushiter;	/* incremented on flush */
56 	xfs_timestamp_t	di_atime;	/* time last accessed */
57 	xfs_timestamp_t	di_mtime;	/* time last modified */
58 	xfs_timestamp_t	di_ctime;	/* time created/inode modified */
59 	__be64		di_size;	/* number of bytes in file */
60 	__be64		di_nblocks;	/* # of direct & btree blocks used */
61 	__be32		di_extsize;	/* basic/minimum extent size for file */
62 	__be32		di_nextents;	/* number of extents in data fork */
63 	__be16		di_anextents;	/* number of extents in attribute fork*/
64 	__u8		di_forkoff;	/* attr fork offs, <<3 for 64b align */
65 	__s8		di_aformat;	/* format of attr fork's data */
66 	__be32		di_dmevmask;	/* DMIG event mask */
67 	__be16		di_dmstate;	/* DMIG state info */
68 	__be16		di_flags;	/* random flags, XFS_DIFLAG_... */
69 	__be32		di_gen;		/* generation number */
70 
71 	/* di_next_unlinked is the only non-core field in the old dinode */
72 	__be32		di_next_unlinked;/* agi unlinked list ptr */
73 } __attribute__((packed)) xfs_dinode_t;
74 
75 #define DI_MAX_FLUSH 0xffff
76 
77 /*
78  * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
79  * Since the pathconf interface is signed, we use 2^31 - 1 instead.
80  * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
81  */
82 #define	XFS_MAXLINK		((1U << 31) - 1U)
83 #define	XFS_MAXLINK_1		65535U
84 
85 /*
86  * Values for di_format
87  */
88 typedef enum xfs_dinode_fmt {
89 	XFS_DINODE_FMT_DEV,		/* xfs_dev_t */
90 	XFS_DINODE_FMT_LOCAL,		/* bulk data */
91 	XFS_DINODE_FMT_EXTENTS,		/* struct xfs_bmbt_rec */
92 	XFS_DINODE_FMT_BTREE,		/* struct xfs_bmdr_block */
93 	XFS_DINODE_FMT_UUID		/* uuid_t */
94 } xfs_dinode_fmt_t;
95 
96 /*
97  * Inode minimum and maximum sizes.
98  */
99 #define	XFS_DINODE_MIN_LOG	8
100 #define	XFS_DINODE_MAX_LOG	11
101 #define	XFS_DINODE_MIN_SIZE	(1 << XFS_DINODE_MIN_LOG)
102 #define	XFS_DINODE_MAX_SIZE	(1 << XFS_DINODE_MAX_LOG)
103 
104 /*
105  * Inode size for given fs.
106  */
107 #define XFS_LITINO(mp) \
108 	((int)(((mp)->m_sb.sb_inodesize) - sizeof(struct xfs_dinode)))
109 
110 #define	XFS_BROOT_SIZE_ADJ	\
111 	(XFS_BTREE_LBLOCK_LEN - sizeof(xfs_bmdr_block_t))
112 
113 /*
114  * Inode data & attribute fork sizes, per inode.
115  */
116 #define XFS_DFORK_Q(dip)		((dip)->di_forkoff != 0)
117 #define XFS_DFORK_BOFF(dip)		((int)((dip)->di_forkoff << 3))
118 
119 #define XFS_DFORK_DSIZE(dip,mp) \
120 	(XFS_DFORK_Q(dip) ? \
121 		XFS_DFORK_BOFF(dip) : \
122 		XFS_LITINO(mp))
123 #define XFS_DFORK_ASIZE(dip,mp) \
124 	(XFS_DFORK_Q(dip) ? \
125 		XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : \
126 		0)
127 #define XFS_DFORK_SIZE(dip,mp,w) \
128 	((w) == XFS_DATA_FORK ? \
129 		XFS_DFORK_DSIZE(dip, mp) : \
130 		XFS_DFORK_ASIZE(dip, mp))
131 
132 /*
133  * Return pointers to the data or attribute forks.
134  */
135 #define XFS_DFORK_DPTR(dip) \
136 	((char *)(dip) + sizeof(struct xfs_dinode))
137 #define XFS_DFORK_APTR(dip)	\
138 	(XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
139 #define XFS_DFORK_PTR(dip,w)	\
140 	((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
141 
142 #define XFS_DFORK_FORMAT(dip,w) \
143 	((w) == XFS_DATA_FORK ? \
144 		(dip)->di_format : \
145 		(dip)->di_aformat)
146 #define XFS_DFORK_NEXTENTS(dip,w) \
147 	((w) == XFS_DATA_FORK ? \
148 		be32_to_cpu((dip)->di_nextents) : \
149 		be16_to_cpu((dip)->di_anextents))
150 
151 #define	XFS_BUF_TO_DINODE(bp)	((xfs_dinode_t *)((bp)->b_addr))
152 
153 /*
154  * For block and character special files the 32bit dev_t is stored at the
155  * beginning of the data fork.
156  */
xfs_dinode_get_rdev(struct xfs_dinode * dip)157 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
158 {
159 	return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
160 }
161 
xfs_dinode_put_rdev(struct xfs_dinode * dip,xfs_dev_t rdev)162 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
163 {
164 	*(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
165 }
166 
167 /*
168  * Values for di_flags
169  * There should be a one-to-one correspondence between these flags and the
170  * XFS_XFLAG_s.
171  */
172 #define XFS_DIFLAG_REALTIME_BIT  0	/* file's blocks come from rt area */
173 #define XFS_DIFLAG_PREALLOC_BIT  1	/* file space has been preallocated */
174 #define XFS_DIFLAG_NEWRTBM_BIT   2	/* for rtbitmap inode, new format */
175 #define XFS_DIFLAG_IMMUTABLE_BIT 3	/* inode is immutable */
176 #define XFS_DIFLAG_APPEND_BIT    4	/* inode is append-only */
177 #define XFS_DIFLAG_SYNC_BIT      5	/* inode is written synchronously */
178 #define XFS_DIFLAG_NOATIME_BIT   6	/* do not update atime */
179 #define XFS_DIFLAG_NODUMP_BIT    7	/* do not dump */
180 #define XFS_DIFLAG_RTINHERIT_BIT 8	/* create with realtime bit set */
181 #define XFS_DIFLAG_PROJINHERIT_BIT   9	/* create with parents projid */
182 #define XFS_DIFLAG_NOSYMLINKS_BIT   10	/* disallow symlink creation */
183 #define XFS_DIFLAG_EXTSIZE_BIT      11	/* inode extent size allocator hint */
184 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12	/* inherit inode extent size */
185 #define XFS_DIFLAG_NODEFRAG_BIT     13	/* do not reorganize/defragment */
186 #define XFS_DIFLAG_FILESTREAM_BIT   14  /* use filestream allocator */
187 #define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
188 #define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
189 #define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
190 #define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
191 #define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
192 #define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
193 #define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
194 #define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
195 #define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
196 #define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
197 #define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
198 #define XFS_DIFLAG_EXTSIZE       (1 << XFS_DIFLAG_EXTSIZE_BIT)
199 #define XFS_DIFLAG_EXTSZINHERIT  (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
200 #define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
201 #define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)
202 
203 #ifdef CONFIG_XFS_RT
204 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
205 #else
206 #define XFS_IS_REALTIME_INODE(ip) (0)
207 #endif
208 
209 #define XFS_DIFLAG_ANY \
210 	(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
211 	 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
212 	 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
213 	 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
214 	 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
215 
216 #endif	/* __XFS_DINODE_H__ */
217