2005-04-17 06:20:36 +08:00
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/*
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* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_INUM_H__
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#define __XFS_INUM_H__
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/*
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* Inode number format:
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* low inopblog bits - offset in block
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* next agblklog bits - block number in ag
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* next agno_log bits - ag number
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* high agno_log-agblklog-inopblog bits - 0
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*/
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typedef __uint32_t xfs_agino_t; /* within allocation grp inode number */
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/*
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* Useful inode bits for this kernel.
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* Used in some places where having 64-bits in the 32-bit kernels
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* costs too much.
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*/
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#if XFS_BIG_INUMS
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typedef xfs_ino_t xfs_intino_t;
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#else
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typedef __uint32_t xfs_intino_t;
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#endif
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#define NULLFSINO ((xfs_ino_t)-1)
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#define NULLAGINO ((xfs_agino_t)-1)
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struct xfs_mount;
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2005-11-02 11:38:42 +08:00
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#define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1)
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#define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog
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#define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog
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#define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log
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#define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log
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#define XFS_INO_BITS(mp) \
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XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
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#define XFS_INO_TO_AGNO(mp,i) \
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2005-04-17 06:20:36 +08:00
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((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
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2005-11-02 11:38:42 +08:00
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#define XFS_INO_TO_AGINO(mp,i) \
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2005-04-17 06:20:36 +08:00
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((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
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2005-11-02 11:38:42 +08:00
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#define XFS_INO_TO_AGBNO(mp,i) \
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2005-04-17 06:20:36 +08:00
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(((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
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XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
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#define XFS_INO_TO_OFFSET(mp,i) \
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2005-04-17 06:20:36 +08:00
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((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
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2005-11-02 11:38:42 +08:00
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#define XFS_INO_TO_FSB(mp,i) \
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2005-04-17 06:20:36 +08:00
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XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
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#define XFS_AGINO_TO_INO(mp,a,i) \
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(((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
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#define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp))
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#define XFS_AGINO_TO_OFFSET(mp,i) \
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((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
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#define XFS_OFFBNO_TO_AGINO(mp,b,o) \
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((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
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#if XFS_BIG_INUMS
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#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL))
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#define XFS_INO64_OFFSET ((xfs_ino_t)(1ULL << 32))
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#else
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#define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 32) - 1ULL))
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#endif
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#define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL))
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#endif /* __XFS_INUM_H__ */
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