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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | #ifndef __XFS_INUM_H__ | |
33 | #define __XFS_INUM_H__ | |
34 | ||
35 | /* | |
36 | * Inode number format: | |
37 | * low inopblog bits - offset in block | |
38 | * next agblklog bits - block number in ag | |
39 | * next agno_log bits - ag number | |
40 | * high agno_log-agblklog-inopblog bits - 0 | |
41 | */ | |
42 | ||
43 | typedef __uint32_t xfs_agino_t; /* within allocation grp inode number */ | |
44 | ||
45 | /* | |
46 | * Useful inode bits for this kernel. | |
47 | * Used in some places where having 64-bits in the 32-bit kernels | |
48 | * costs too much. | |
49 | */ | |
50 | #if XFS_BIG_INUMS | |
51 | typedef xfs_ino_t xfs_intino_t; | |
52 | #else | |
53 | typedef __uint32_t xfs_intino_t; | |
54 | #endif | |
55 | ||
56 | #define NULLFSINO ((xfs_ino_t)-1) | |
57 | #define NULLAGINO ((xfs_agino_t)-1) | |
58 | ||
59 | struct xfs_mount; | |
60 | ||
a844f451 NS |
61 | #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) |
62 | #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog | |
63 | #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog | |
64 | #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log | |
65 | #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log | |
66 | #define XFS_INO_BITS(mp) \ | |
67 | XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) | |
68 | #define XFS_INO_TO_AGNO(mp,i) \ | |
1da177e4 | 69 | ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) |
a844f451 | 70 | #define XFS_INO_TO_AGINO(mp,i) \ |
1da177e4 | 71 | ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) |
a844f451 | 72 | #define XFS_INO_TO_AGBNO(mp,i) \ |
1da177e4 | 73 | (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ |
a844f451 NS |
74 | XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) |
75 | #define XFS_INO_TO_OFFSET(mp,i) \ | |
1da177e4 | 76 | ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) |
a844f451 | 77 | #define XFS_INO_TO_FSB(mp,i) \ |
1da177e4 | 78 | XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) |
1da177e4 LT |
79 | #define XFS_AGINO_TO_INO(mp,a,i) \ |
80 | (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) | |
1da177e4 | 81 | #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) |
1da177e4 LT |
82 | #define XFS_AGINO_TO_OFFSET(mp,i) \ |
83 | ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) | |
1da177e4 LT |
84 | #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ |
85 | ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) | |
1da177e4 LT |
86 | |
87 | #if XFS_BIG_INUMS | |
88 | #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) | |
89 | #define XFS_INO64_OFFSET ((xfs_ino_t)(1ULL << 32)) | |
90 | #else | |
91 | #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 32) - 1ULL)) | |
92 | #endif | |
93 | #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) | |
94 | ||
95 | #endif /* __XFS_INUM_H__ */ |