LXR linux/fs/xfs/libxfs/xfs

   1/*
   2 * Copyright (c) 2000-2005 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_TYPES_H__
  19#define __XFS_TYPES_H__
  20
  21typedef __uint32_t      prid_t;         /* project ID */
  22
  23typedef __uint32_t      xfs_agblock_t;  /* blockno in alloc. group */
  24typedef __uint32_t      xfs_agino_t;    /* inode # within allocation grp */
  25typedef __uint32_t      xfs_extlen_t;   /* extent length in blocks */
  26typedef __uint32_t      xfs_agnumber_t; /* allocation group number */
  27typedef __int32_t       xfs_extnum_t;   /* # of extents in a file */
  28typedef __int16_t       xfs_aextnum_t;  /* # extents in an attribute fork */
  29typedef __int64_t       xfs_fsize_t;    /* bytes in a file */
  30typedef __uint64_t      xfs_ufsize_t;   /* unsigned bytes in a file */
  31
  32typedef __int32_t       xfs_suminfo_t;  /* type of bitmap summary info */
  33typedef __int32_t       xfs_rtword_t;   /* word type for bitmap manipulations */
  34
  35typedef __int64_t       xfs_lsn_t;      /* log sequence number */
  36typedef __int32_t       xfs_tid_t;      /* transaction identifier */
  37
  38typedef __uint32_t      xfs_dablk_t;    /* dir/attr block number (in file) */
  39typedef __uint32_t      xfs_dahash_t;   /* dir/attr hash value */
  40
  41typedef __uint64_t      xfs_fsblock_t;  /* blockno in filesystem (agno|agbno) */
  42typedef __uint64_t      xfs_rfsblock_t; /* blockno in filesystem (raw) */
  43typedef __uint64_t      xfs_rtblock_t;  /* extent (block) in realtime area */
  44typedef __uint64_t      xfs_fileoff_t;  /* block number in a file */
  45typedef __uint64_t      xfs_filblks_t;  /* number of blocks in a file */
  46
  47typedef __int64_t       xfs_srtblock_t; /* signed version of xfs_rtblock_t */
  48typedef __int64_t       xfs_sfiloff_t;  /* signed block number in a file */
  49
  50/*
  51 * Null values for the types.
  52 */
  53#define NULLFSBLOCK     ((xfs_fsblock_t)-1)
  54#define NULLRFSBLOCK    ((xfs_rfsblock_t)-1)
  55#define NULLRTBLOCK     ((xfs_rtblock_t)-1)
  56#define NULLFILEOFF     ((xfs_fileoff_t)-1)
  57
  58#define NULLAGBLOCK     ((xfs_agblock_t)-1)
  59#define NULLAGNUMBER    ((xfs_agnumber_t)-1)
  60
  61#define NULLCOMMITLSN   ((xfs_lsn_t)-1)
  62
  63#define NULLFSINO       ((xfs_ino_t)-1)
  64#define NULLAGINO       ((xfs_agino_t)-1)
  65
  66/*
  67 * Max values for extlen, extnum, aextnum.
  68 */
  69#define MAXEXTLEN       ((xfs_extlen_t)0x001fffff)      /* 21 bits */
  70#define MAXEXTNUM       ((xfs_extnum_t)0x7fffffff)      /* signed int */
  71#define MAXAEXTNUM      ((xfs_aextnum_t)0x7fff)         /* signed short */
  72
  73/*
  74 * Minimum and maximum blocksize and sectorsize.
  75 * The blocksize upper limit is pretty much arbitrary.
  76 * The sectorsize upper limit is due to sizeof(sb_sectsize).
  77 * CRC enable filesystems use 512 byte inodes, meaning 512 byte block sizes
  78 * cannot be used.
  79 */
  80#define XFS_MIN_BLOCKSIZE_LOG   9       /* i.e. 512 bytes */
  81#define XFS_MAX_BLOCKSIZE_LOG   16      /* i.e. 65536 bytes */
  82#define XFS_MIN_BLOCKSIZE       (1 << XFS_MIN_BLOCKSIZE_LOG)
  83#define XFS_MAX_BLOCKSIZE       (1 << XFS_MAX_BLOCKSIZE_LOG)
  84#define XFS_MIN_CRC_BLOCKSIZE   (1 << (XFS_MIN_BLOCKSIZE_LOG + 1))
  85#define XFS_MIN_SECTORSIZE_LOG  9       /* i.e. 512 bytes */
  86#define XFS_MAX_SECTORSIZE_LOG  15      /* i.e. 32768 bytes */
  87#define XFS_MIN_SECTORSIZE      (1 << XFS_MIN_SECTORSIZE_LOG)
  88#define XFS_MAX_SECTORSIZE      (1 << XFS_MAX_SECTORSIZE_LOG)
  89
  90/*
  91 * Inode fork identifiers.
  92 */
  93#define XFS_DATA_FORK   0
  94#define XFS_ATTR_FORK   1
  95#define XFS_COW_FORK    2
  96
  97/*
  98 * Min numbers of data/attr fork btree root pointers.
  99 */
 100#define MINDBTPTRS      3
 101#define MINABTPTRS      2
 102
 103/*
 104 * MAXNAMELEN is the length (including the terminating null) of
 105 * the longest permissible file (component) name.
 106 */
 107#define MAXNAMELEN      256
 108
 109typedef enum {
 110        XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
 111} xfs_lookup_t;
 112
 113typedef enum {
 114        XFS_BTNUM_BNOi, XFS_BTNUM_CNTi, XFS_BTNUM_RMAPi, XFS_BTNUM_BMAPi,
 115        XFS_BTNUM_INOi, XFS_BTNUM_FINOi, XFS_BTNUM_REFCi, XFS_BTNUM_MAX
 116} xfs_btnum_t;
 117
 118struct xfs_name {
 119        const unsigned char     *name;
 120        int                     len;
 121        int                     type;
 122};
 123
 124/*
 125 * uid_t and gid_t are hard-coded to 32 bits in the inode.
 126 * Hence, an 'id' in a dquot is 32 bits..
 127 */
 128typedef __uint32_t      xfs_dqid_t;
 129
 130/*
 131 * Constants for bit manipulations.
 132 */
 133#define XFS_NBBYLOG     3               /* log2(NBBY) */
 134#define XFS_WORDLOG     2               /* log2(sizeof(xfs_rtword_t)) */
 135#define XFS_NBWORDLOG   (XFS_NBBYLOG + XFS_WORDLOG)
 136#define XFS_NBWORD      (1 << XFS_NBWORDLOG)
 137#define XFS_WORDMASK    ((1 << XFS_WORDLOG) - 1)
 138
 139
 140#endif  /* __XFS_TYPES_H__ */
 141