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
29struct xfs_mount;
30
31#define	XFS_INO_MASK(k)			(__uint32_t)((1ULL << (k)) - 1)
32#define	XFS_INO_OFFSET_BITS(mp)		(mp)->m_sb.sb_inopblog
33#define	XFS_INO_AGBNO_BITS(mp)		(mp)->m_sb.sb_agblklog
34#define	XFS_INO_AGINO_BITS(mp)		(mp)->m_agino_log
35#define	XFS_INO_AGNO_BITS(mp)		(mp)->m_agno_log
36#define	XFS_INO_BITS(mp)		\
37	XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
38#define	XFS_INO_TO_AGNO(mp,i)		\
39	((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
40#define	XFS_INO_TO_AGINO(mp,i)		\
41	((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
42#define	XFS_INO_TO_AGBNO(mp,i)		\
43	(((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
44		XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
45#define	XFS_INO_TO_OFFSET(mp,i)		\
46	((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
47#define	XFS_INO_TO_FSB(mp,i)		\
48	XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
49#define	XFS_AGINO_TO_INO(mp,a,i)	\
50	(((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
51#define	XFS_AGINO_TO_AGBNO(mp,i)	((i) >> XFS_INO_OFFSET_BITS(mp))
52#define	XFS_AGINO_TO_OFFSET(mp,i)	\
53	((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
54#define	XFS_OFFBNO_TO_AGINO(mp,b,o)	\
55	((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
56
57#if XFS_BIG_INUMS
58#define	XFS_MAXINUMBER		((xfs_ino_t)((1ULL << 56) - 1ULL))
59#else
60#define	XFS_MAXINUMBER		((xfs_ino_t)((1ULL << 32) - 1ULL))
61#endif
62#define	XFS_MAXINUMBER_32	((xfs_ino_t)((1ULL << 32) - 1ULL))
63
64#endif	/* __XFS_INUM_H__ */