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
29typedef	__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
37typedef	xfs_ino_t	xfs_intino_t;
38#else
39typedef	__uint32_t	xfs_intino_t;
40#endif
41
42#define	NULLFSINO	((xfs_ino_t)-1)
43#define	NULLAGINO	((xfs_agino_t)-1)
44
45struct 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