fs/xfs/xfs_inum.h

   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
  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)           \
  69         ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
  70 #define XFS_INO_TO_AGINO(mp,i)          \
  71         ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
  72 #define XFS_INO_TO_AGBNO(mp,i)          \
  73         (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
  74                 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
  75 #define XFS_INO_TO_OFFSET(mp,i)         \
  76         ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
  77 #define XFS_INO_TO_FSB(mp,i)            \
  78         XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
  79 #define XFS_AGINO_TO_INO(mp,a,i)        \
  80         (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
  81 #define XFS_AGINO_TO_AGBNO(mp,i)        ((i) >> XFS_INO_OFFSET_BITS(mp))
  82 #define XFS_AGINO_TO_OFFSET(mp,i)       \
  83         ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
  84 #define XFS_OFFBNO_TO_AGINO(mp,b,o)     \
  85         ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
  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__ */