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) <= 3)
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_DPTR, XFS_DFORK_APTR, 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
74 /* start of the extended dinode, writable fields */
75 __le32 di_crc; /* CRC of the inode */
76 __be64 di_changecount; /* number of attribute changes */
77 __be64 di_lsn; /* flush sequence */
78 __be64 di_flags2; /* more random flags */
79 __u8 di_pad2[16]; /* more padding for future expansion */
80
81 /* fields only written to during inode creation */
82 xfs_timestamp_t di_crtime; /* time created */
83 __be64 di_ino; /* inode number */
84 uuid_t di_uuid; /* UUID of the filesystem */
85
86 /* structure must be padded to 64 bit alignment */
87 } xfs_dinode_t;
88
89 #define DI_MAX_FLUSH 0xffff
90
91 /*
92 * Size of the core inode on disk. Version 1 and 2 inodes have
93 * the same size, but version 3 has grown a few additional fields.
94 */
xfs_dinode_size(int version)95 static inline uint xfs_dinode_size(int version)
96 {
97 if (version == 3)
98 return sizeof(struct xfs_dinode);
99 return offsetof(struct xfs_dinode, di_crc);
100 }
101
102 /*
103 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
104 * Since the pathconf interface is signed, we use 2^31 - 1 instead.
105 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
106 */
107 #define XFS_MAXLINK ((1U << 31) - 1U)
108 #define XFS_MAXLINK_1 65535U
109
110 /*
111 * Values for di_format
112 */
113 typedef enum xfs_dinode_fmt {
114 XFS_DINODE_FMT_DEV, /* xfs_dev_t */
115 XFS_DINODE_FMT_LOCAL, /* bulk data */
116 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */
117 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */
118 XFS_DINODE_FMT_UUID /* uuid_t */
119 } xfs_dinode_fmt_t;
120
121 /*
122 * Inode minimum and maximum sizes.
123 */
124 #define XFS_DINODE_MIN_LOG 8
125 #define XFS_DINODE_MAX_LOG 11
126 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
127 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
128
129 /*
130 * Inode size for given fs.
131 */
132 #define XFS_LITINO(mp, version) \
133 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
134
135 #define XFS_BROOT_SIZE_ADJ(ip) \
136 (XFS_BMBT_BLOCK_LEN((ip)->i_mount) - sizeof(xfs_bmdr_block_t))
137
138 /*
139 * Inode data & attribute fork sizes, per inode.
140 */
141 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0)
142 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3))
143
144 #define XFS_DFORK_DSIZE(dip,mp) \
145 (XFS_DFORK_Q(dip) ? \
146 XFS_DFORK_BOFF(dip) : \
147 XFS_LITINO(mp, (dip)->di_version))
148 #define XFS_DFORK_ASIZE(dip,mp) \
149 (XFS_DFORK_Q(dip) ? \
150 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
151 0)
152 #define XFS_DFORK_SIZE(dip,mp,w) \
153 ((w) == XFS_DATA_FORK ? \
154 XFS_DFORK_DSIZE(dip, mp) : \
155 XFS_DFORK_ASIZE(dip, mp))
156
157 /*
158 * Return pointers to the data or attribute forks.
159 */
160 #define XFS_DFORK_DPTR(dip) \
161 ((char *)dip + xfs_dinode_size(dip->di_version))
162 #define XFS_DFORK_APTR(dip) \
163 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
164 #define XFS_DFORK_PTR(dip,w) \
165 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
166
167 #define XFS_DFORK_FORMAT(dip,w) \
168 ((w) == XFS_DATA_FORK ? \
169 (dip)->di_format : \
170 (dip)->di_aformat)
171 #define XFS_DFORK_NEXTENTS(dip,w) \
172 ((w) == XFS_DATA_FORK ? \
173 be32_to_cpu((dip)->di_nextents) : \
174 be16_to_cpu((dip)->di_anextents))
175
176 #define XFS_BUF_TO_DINODE(bp) ((xfs_dinode_t *)((bp)->b_addr))
177
178 /*
179 * For block and character special files the 32bit dev_t is stored at the
180 * beginning of the data fork.
181 */
xfs_dinode_get_rdev(struct xfs_dinode * dip)182 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
183 {
184 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
185 }
186
xfs_dinode_put_rdev(struct xfs_dinode * dip,xfs_dev_t rdev)187 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
188 {
189 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
190 }
191
192 /*
193 * Values for di_flags
194 * There should be a one-to-one correspondence between these flags and the
195 * XFS_XFLAG_s.
196 */
197 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
198 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
199 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
200 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
201 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
202 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
203 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
204 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
205 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
206 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
207 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
208 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
209 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
210 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
211 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
212 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
213 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
214 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
215 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
216 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
217 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
218 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
219 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
220 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
221 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
222 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
223 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
224 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
225 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
226 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
227
228 #ifdef CONFIG_XFS_RT
229 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
230 #else
231 #define XFS_IS_REALTIME_INODE(ip) (0)
232 #endif
233
234 #define XFS_DIFLAG_ANY \
235 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
236 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
237 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
238 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
239 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
240
241 #endif /* __XFS_DINODE_H__ */
242