xfs_inum.h

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/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_INUM_H__
#define __XFS_INUM_H__

/*
 * Inode number format:
 * low inopblog bits - offset in block
 * next agblklog bits - block number in ag
 * next agno_log bits - ag number
 * high agno_log-agblklog-inopblog bits - 0
 */

struct xfs_mount;

#define XFS_INO_MASK(k)         (__uint32_t)((1ULL << (k)) - 1)
#define XFS_INO_OFFSET_BITS(mp)     (mp)->m_sb.sb_inopblog
#define XFS_INO_AGBNO_BITS(mp)      (mp)->m_sb.sb_agblklog
#define XFS_INO_AGINO_BITS(mp)      (mp)->m_agino_log
#define XFS_INO_AGNO_BITS(mp)       (mp)->m_agno_log
#define XFS_INO_BITS(mp)        \
    XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
#define XFS_INO_TO_AGNO(mp,i)       \
    ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
#define XFS_INO_TO_AGINO(mp,i)      \
    ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
#define XFS_INO_TO_AGBNO(mp,i)      \
    (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
        XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
#define XFS_INO_TO_OFFSET(mp,i)     \
    ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
#define XFS_INO_TO_FSB(mp,i)        \
    XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
#define XFS_AGINO_TO_INO(mp,a,i)    \
    (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
#define XFS_AGINO_TO_AGBNO(mp,i)    ((i) >> XFS_INO_OFFSET_BITS(mp))
#define XFS_AGINO_TO_OFFSET(mp,i)   \
    ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
#define XFS_OFFBNO_TO_AGINO(mp,b,o) \
    ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))

#if XFS_BIG_INUMS
#define XFS_MAXINUMBER      ((xfs_ino_t)((1ULL << 56) - 1ULL))
#else
#define XFS_MAXINUMBER      ((xfs_ino_t)((1ULL << 32) - 1ULL))
#endif
#define XFS_MAXINUMBER_32   ((xfs_ino_t)((1ULL << 32) - 1ULL))

#endif  /* __XFS_INUM_H__ */