1 /*
2 * Copyright (c) 2000-2003,2005 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_INUM_H__
19 #define __XFS_INUM_H__
20
21 /*
22 * Inode number format:
23 * low inopblog bits - offset in block
24 * next agblklog bits - block number in ag
25 * next agno_log bits - ag number
26 * high agno_log-agblklog-inopblog bits - 0
27 */
28
29 typedef __uint32_t xfs_agino_t; /* within allocation grp inode number */
30
31 /*
32 * Useful inode bits for this kernel.
33 * Used in some places where having 64-bits in the 32-bit kernels
34 * costs too much.
35 */
36 #if XFS_BIG_INUMS
37 typedef xfs_ino_t xfs_intino_t;
38 #else
39 typedef __uint32_t xfs_intino_t;
40 #endif
41
42 #define NULLFSINO ((xfs_ino_t)-1)
43 #define NULLAGINO ((xfs_agino_t)-1)
44
45 struct xfs_mount;
46
47 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1)
48 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
49 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
50 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
51 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
52 #define XFS_INO_BITS(mp) \
53 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
54 #define XFS_INO_TO_AGNO(mp,i) \
55 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
56 #define XFS_INO_TO_AGINO(mp,i) \
57 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
58 #define XFS_INO_TO_AGBNO(mp,i) \
59 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
60 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
61 #define XFS_INO_TO_OFFSET(mp,i) \
62 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
63 #define XFS_INO_TO_FSB(mp,i) \
64 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
65 #define XFS_AGINO_TO_INO(mp,a,i) \
66 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
67 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
68 #define XFS_AGINO_TO_OFFSET(mp,i) \
69 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
70 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \
71 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
72
73 #if XFS_BIG_INUMS
74 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
75 #define XFS_INO64_OFFSET ((xfs_ino_t)(1ULL << 32))
76 #else
77 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 32) - 1ULL))
78 #endif
79 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
80
81 #endif /* __XFS_INUM_H__ */
82
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