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; /* owner's project id */
53 __u8 di_pad[8]; /* unused, zeroed space */
54 __be16 di_flushiter; /* incremented on flush */
55 xfs_timestamp_t di_atime; /* time last accessed */
56 xfs_timestamp_t di_mtime; /* time last modified */
57 xfs_timestamp_t di_ctime; /* time created/inode modified */
58 __be64 di_size; /* number of bytes in file */
59 __be64 di_nblocks; /* # of direct & btree blocks used */
60 __be32 di_extsize; /* basic/minimum extent size for file */
61 __be32 di_nextents; /* number of extents in data fork */
62 __be16 di_anextents; /* number of extents in attribute fork*/
63 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */
64 __s8 di_aformat; /* format of attr fork's data */
65 __be32 di_dmevmask; /* DMIG event mask */
66 __be16 di_dmstate; /* DMIG state info */
67 __be16 di_flags; /* random flags, XFS_DIFLAG_... */
68 __be32 di_gen; /* generation number */
69
70 /* di_next_unlinked is the only non-core field in the old dinode */
71 __be32 di_next_unlinked;/* agi unlinked list ptr */
72 } __attribute__((packed)) xfs_dinode_t;
73
74 #define DI_MAX_FLUSH 0xffff
75
76 /*
77 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
78 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
79 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
80 */
81 #define XFS_MAXLINK ((1U << 31) - 1U)
82 #define XFS_MAXLINK_1 65535U
83
84 /*
85 * Values for di_format
86 */
87 typedef enum xfs_dinode_fmt {
88 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
89 XFS_DINODE_FMT_LOCAL, /* bulk data */
90 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
91 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
92 XFS_DINODE_FMT_UUID /* uuid_t */
93 } xfs_dinode_fmt_t;
94
95 /*
96 * Inode minimum and maximum sizes.
97 */
98 #define XFS_DINODE_MIN_LOG 8
99 #define XFS_DINODE_MAX_LOG 11
100 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
101 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
102
103 /*
104 * Inode size for given fs.
105 */
106 #define XFS_LITINO(mp) ((mp)->m_litino)
107 #define XFS_BROOT_SIZE_ADJ \
108 (XFS_BTREE_LBLOCK_LEN - sizeof(xfs_bmdr_block_t))
109
110 /*
111 * Inode data & attribute fork sizes, per inode.
112 */
113 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
114 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
115
116 #define XFS_DFORK_DSIZE(dip,mp) \
117 (XFS_DFORK_Q(dip) ? \
118 XFS_DFORK_BOFF(dip) : \
119 XFS_LITINO(mp))
120 #define XFS_DFORK_ASIZE(dip,mp) \
121 (XFS_DFORK_Q(dip) ? \
122 XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : \
123 0)
124 #define XFS_DFORK_SIZE(dip,mp,w) \
125 ((w) == XFS_DATA_FORK ? \
126 XFS_DFORK_DSIZE(dip, mp) : \
127 XFS_DFORK_ASIZE(dip, mp))
128
129 /*
130 * Return pointers to the data or attribute forks.
131 */
132 #define XFS_DFORK_DPTR(dip) \
133 ((char *)(dip) + sizeof(struct xfs_dinode))
134 #define XFS_DFORK_APTR(dip) \
135 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
136 #define XFS_DFORK_PTR(dip,w) \
137 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
138
139 #define XFS_DFORK_FORMAT(dip,w) \
140 ((w) == XFS_DATA_FORK ? \
141 (dip)->di_format : \
142 (dip)->di_aformat)
143 #define XFS_DFORK_NEXTENTS(dip,w) \
144 ((w) == XFS_DATA_FORK ? \
145 be32_to_cpu((dip)->di_nextents) : \
146 be16_to_cpu((dip)->di_anextents))
147
148 #define XFS_BUF_TO_DINODE(bp) ((xfs_dinode_t *)XFS_BUF_PTR(bp))
149
150 /*
151 * For block and character special files the 32bit dev_t is stored at the
152 * beginning of the data fork.
153 */
xfs_dinode_get_rdev(struct xfs_dinode * dip)154 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
155 {
156 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
157 }
158
xfs_dinode_put_rdev(struct xfs_dinode * dip,xfs_dev_t rdev)159 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
160 {
161 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
162 }
163
164 /*
165 * Values for di_flags
166 * There should be a one-to-one correspondence between these flags and the
167 * XFS_XFLAG_s.
168 */
169 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
170 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
171 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
172 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
173 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
174 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
175 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
176 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
177 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
178 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
179 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
180 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
181 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
182 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
183 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
184 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
185 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
186 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
187 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
188 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
189 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
190 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
191 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
192 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
193 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
194 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
195 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
196 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
197 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
198 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
199
200 #ifdef CONFIG_XFS_RT
201 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
202 #else
203 #define XFS_IS_REALTIME_INODE(ip) (0)
204 #endif
205
206 #define XFS_DIFLAG_ANY \
207 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
208 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
209 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
210 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
211 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
212
213 #endif /* __XFS_DINODE_H__ */
214