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 #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)
  68 int 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)
  74 int 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)
  80 int 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)
  86 int 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)
  92 int 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)
  99 xfs_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)
 106 xfs_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)
 113 xfs_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)
 121 int 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)
 128 xfs_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)
 136 xfs_ino_t
 137 xfs_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)
 144 xfs_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)
 150 int 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)
 158 xfs_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__ */