fs/xfs/xfs_inum.h

   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
  29 typedef __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
  37 typedef xfs_ino_t       xfs_intino_t;
  38 #else
  39 typedef __uint32_t      xfs_intino_t;
  40 #endif
  41
  42 #define NULLFSINO       ((xfs_ino_t)-1)
  43 #define NULLAGINO       ((xfs_agino_t)-1)
  44
  45 struct 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 #else
  76 #define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 32) - 1ULL))
  77 #endif
  78 #define XFS_MAXINUMBER_32       ((xfs_ino_t)((1ULL << 32) - 1ULL))
  79
  80 #endif  /* __XFS_INUM_H__ */