blob: a3af2d5a6eb7a501e0f66bde2a1f49ece5ef6672 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
43typedef __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
51typedef xfs_ino_t xfs_intino_t;
52#else
53typedef __uint32_t xfs_intino_t;
54#endif
55
56#define NULLFSINO ((xfs_ino_t)-1)
57#define NULLAGINO ((xfs_agino_t)-1)
58
59struct xfs_mount;
60
61#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_MASK)
62__uint32_t xfs_ino_mask(int k);
63#define XFS_INO_MASK(k) xfs_ino_mask(k)
64#else
65#define XFS_INO_MASK(k) ((__uint32_t)((1ULL << (k)) - 1))
66#endif
67#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_OFFSET_BITS)
68int xfs_ino_offset_bits(struct xfs_mount *mp);
69#define XFS_INO_OFFSET_BITS(mp) xfs_ino_offset_bits(mp)
70#else
71#define XFS_INO_OFFSET_BITS(mp) ((mp)->m_sb.sb_inopblog)
72#endif
73#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_AGBNO_BITS)
74int xfs_ino_agbno_bits(struct xfs_mount *mp);
75#define XFS_INO_AGBNO_BITS(mp) xfs_ino_agbno_bits(mp)
76#else
77#define XFS_INO_AGBNO_BITS(mp) ((mp)->m_sb.sb_agblklog)
78#endif
79#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_AGINO_BITS)
80int xfs_ino_agino_bits(struct xfs_mount *mp);
81#define XFS_INO_AGINO_BITS(mp) xfs_ino_agino_bits(mp)
82#else
83#define XFS_INO_AGINO_BITS(mp) ((mp)->m_agino_log)
84#endif
85#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_AGNO_BITS)
86int xfs_ino_agno_bits(struct xfs_mount *mp);
87#define XFS_INO_AGNO_BITS(mp) xfs_ino_agno_bits(mp)
88#else
89#define XFS_INO_AGNO_BITS(mp) ((mp)->m_agno_log)
90#endif
91#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_BITS)
92int xfs_ino_bits(struct xfs_mount *mp);
93#define XFS_INO_BITS(mp) xfs_ino_bits(mp)
94#else
95#define XFS_INO_BITS(mp) (XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp))
96#endif
97
98#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_TO_AGNO)
99xfs_agnumber_t xfs_ino_to_agno(struct xfs_mount *mp, xfs_ino_t i);
100#define XFS_INO_TO_AGNO(mp,i) xfs_ino_to_agno(mp,i)
101#else
102#define XFS_INO_TO_AGNO(mp,i) \
103 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
104#endif
105#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_TO_AGINO)
106xfs_agino_t xfs_ino_to_agino(struct xfs_mount *mp, xfs_ino_t i);
107#define XFS_INO_TO_AGINO(mp,i) xfs_ino_to_agino(mp,i)
108#else
109#define XFS_INO_TO_AGINO(mp,i) \
110 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
111#endif
112#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_TO_AGBNO)
113xfs_agblock_t xfs_ino_to_agbno(struct xfs_mount *mp, xfs_ino_t i);
114#define XFS_INO_TO_AGBNO(mp,i) xfs_ino_to_agbno(mp,i)
115#else
116#define XFS_INO_TO_AGBNO(mp,i) \
117 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
118 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
119#endif
120#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_TO_OFFSET)
121int xfs_ino_to_offset(struct xfs_mount *mp, xfs_ino_t i);
122#define XFS_INO_TO_OFFSET(mp,i) xfs_ino_to_offset(mp,i)
123#else
124#define XFS_INO_TO_OFFSET(mp,i) \
125 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
126#endif
127#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_INO_TO_FSB)
128xfs_fsblock_t xfs_ino_to_fsb(struct xfs_mount *mp, xfs_ino_t i);
129#define XFS_INO_TO_FSB(mp,i) xfs_ino_to_fsb(mp,i)
130#else
131#define XFS_INO_TO_FSB(mp,i) \
132 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
133#endif
134
135#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGINO_TO_INO)
136xfs_ino_t
137xfs_agino_to_ino(struct xfs_mount *mp, xfs_agnumber_t a, xfs_agino_t i);
138#define XFS_AGINO_TO_INO(mp,a,i) xfs_agino_to_ino(mp,a,i)
139#else
140#define XFS_AGINO_TO_INO(mp,a,i) \
141 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
142#endif
143#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGINO_TO_AGBNO)
144xfs_agblock_t xfs_agino_to_agbno(struct xfs_mount *mp, xfs_agino_t i);
145#define XFS_AGINO_TO_AGBNO(mp,i) xfs_agino_to_agbno(mp,i)
146#else
147#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
148#endif
149#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGINO_TO_OFFSET)
150int xfs_agino_to_offset(struct xfs_mount *mp, xfs_agino_t i);
151#define XFS_AGINO_TO_OFFSET(mp,i) xfs_agino_to_offset(mp,i)
152#else
153#define XFS_AGINO_TO_OFFSET(mp,i) \
154 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
155#endif
156
157#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_OFFBNO_TO_AGINO)
158xfs_agino_t xfs_offbno_to_agino(struct xfs_mount *mp, xfs_agblock_t b, int o);
159#define XFS_OFFBNO_TO_AGINO(mp,b,o) xfs_offbno_to_agino(mp,b,o)
160#else
161#define XFS_OFFBNO_TO_AGINO(mp,b,o) \
162 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
163#endif
164
165#if XFS_BIG_INUMS
166#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
167#define XFS_INO64_OFFSET ((xfs_ino_t)(1ULL << 32))
168#else
169#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 32) - 1ULL))
170#endif
171#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
172
173#endif /* __XFS_INUM_H__ */