include/xfs_types.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_TYPES_H__
  33 #define __XFS_TYPES_H__
  34
  35 #ifdef __KERNEL__
  36
  37 /*
  38  * POSIX Extensions
  39  */
  40 typedef unsigned char           uchar_t;
  41 typedef unsigned short          ushort_t;
  42 typedef unsigned int            uint_t;
  43 typedef unsigned long           ulong_t;
  44
  45 /*
  46  * Additional type declarations for XFS
  47  */
  48 typedef signed char             __int8_t;
  49 typedef unsigned char           __uint8_t;
  50 typedef signed short int        __int16_t;
  51 typedef unsigned short int      __uint16_t;
  52 typedef signed int              __int32_t;
  53 typedef unsigned int            __uint32_t;
  54 typedef signed long long int    __int64_t;
  55 typedef unsigned long long int  __uint64_t;
  56
  57 typedef enum { B_FALSE,B_TRUE } boolean_t;
  58 typedef __int64_t               prid_t;         /* project ID */
  59 typedef __uint32_t              inst_t;         /* an instruction */
  60
  61 typedef __u64                   xfs_off_t;
  62 typedef __u64                   xfs_ino_t;      /* <inode> type */
  63 typedef __s64                   xfs_daddr_t;    /* <disk address> type */
  64 typedef char *                  xfs_caddr_t;    /* <core address> type */
  65 typedef __u32                   xfs_dev_t;
  66
  67 /* __psint_t is the same size as a pointer */
  68 #if (BITS_PER_LONG == 32)
  69 typedef __int32_t __psint_t;
  70 typedef __uint32_t __psunsigned_t;
  71 #elif (BITS_PER_LONG == 64)
  72 typedef __int64_t __psint_t;
  73 typedef __uint64_t __psunsigned_t;
  74 #else
  75 #error BITS_PER_LONG must be 32 or 64
  76 #endif
  77
  78 #endif  /* __KERNEL__ */
  79
  80 /*
  81  * Some types are conditional based on the selected configuration.
  82  * Set XFS_BIG_FILESYSTEMS=1 or 0 depending on the desired configuration.
  83  * XFS_BIG_FILESYSTEMS needs daddr_t to be 64 bits
  84  *
  85  * On linux right now we are limited to 2^32 512 byte blocks in a
  86  * filesystem, Once this limit is changed, setting this to 1
  87  * will allow XFS to go larger. With BIG_FILESYSTEMS set to 0
  88  * a 4K block filesystem could still theoretically be 16Gbytes
  89  * long, so on an ia32 box the 32 bit page index will then be
  90  * the limiting factor.
  91  */
  92
  93 #if defined(CONFIG_LBD) || (defined(HAVE_SECTOR_T) && (BITS_PER_LONG == 64))
  94 #  ifndef XFS_BIG_FILESYSTEMS
  95 #  define XFS_BIG_FILESYSTEMS   1
  96 #  endif
  97 #else
  98 #  ifndef XFS_BIG_FILESYSTEMS
  99 #  define XFS_BIG_FILESYSTEMS   0
 100 #  endif
 101 #endif
 102
 103 typedef __uint32_t      xfs_agblock_t;  /* blockno in alloc. group */
 104 typedef __uint32_t      xfs_extlen_t;   /* extent length in blocks */
 105 typedef __uint32_t      xfs_agnumber_t; /* allocation group number */
 106 typedef __int32_t       xfs_extnum_t;   /* # of extents in a file */
 107 typedef __int16_t       xfs_aextnum_t;  /* # extents in an attribute fork */
 108 typedef __int64_t       xfs_fsize_t;    /* bytes in a file */
 109 typedef __uint64_t      xfs_ufsize_t;   /* unsigned bytes in a file */
 110
 111 typedef __int32_t       xfs_suminfo_t;  /* type of bitmap summary info */
 112 typedef __int32_t       xfs_rtword_t;   /* word type for bitmap manipulations */
 113
 114 typedef __int64_t       xfs_lsn_t;      /* log sequence number */
 115 typedef __int32_t       xfs_tid_t;      /* transaction identifier */
 116
 117 typedef __uint32_t      xfs_dablk_t;    /* dir/attr block number (in file) */
 118 typedef __uint32_t      xfs_dahash_t;   /* dir/attr hash value */
 119
 120 typedef __uint16_t      xfs_prid_t;     /* prid_t truncated to 16bits in XFS */
 121
 122 /*
 123  * These types are 64 bits on disk but are either 32 or 64 bits in memory.
 124  * Disk based types:
 125  */
 126 typedef __uint64_t      xfs_dfsbno_t;   /* blockno in filesystem (agno|agbno) */
 127 typedef __uint64_t      xfs_drfsbno_t;  /* blockno in filesystem (raw) */
 128 typedef __uint64_t      xfs_drtbno_t;   /* extent (block) in realtime area */
 129 typedef __uint64_t      xfs_dfiloff_t;  /* block number in a file */
 130 typedef __uint64_t      xfs_dfilblks_t; /* number of blocks in a file */
 131
 132 /*
 133  * Memory based types are conditional.
 134  */
 135 #if XFS_BIG_FILESYSTEMS
 136 typedef __uint64_t      xfs_fsblock_t;  /* blockno in filesystem (agno|agbno) */
 137 typedef __uint64_t      xfs_rfsblock_t; /* blockno in filesystem (raw) */
 138 typedef __uint64_t      xfs_rtblock_t;  /* extent (block) in realtime area */
 139 typedef __int64_t       xfs_srtblock_t; /* signed version of xfs_rtblock_t */
 140 #else
 141 typedef __uint32_t      xfs_fsblock_t;  /* blockno in filesystem (agno|agbno) */
 142 typedef __uint32_t      xfs_rfsblock_t; /* blockno in filesystem (raw) */
 143 typedef __uint32_t      xfs_rtblock_t;  /* extent (block) in realtime area */
 144 typedef __int32_t       xfs_srtblock_t; /* signed version of xfs_rtblock_t */
 145 #endif
 146 typedef __uint64_t      xfs_fileoff_t;  /* block number in a file */
 147 typedef __int64_t       xfs_sfiloff_t;  /* signed block number in a file */
 148 typedef __uint64_t      xfs_filblks_t;  /* number of blocks in a file */
 149
 150 typedef __uint8_t       xfs_arch_t;     /* architecture of an xfs fs */
 151
 152 /*
 153  * Null values for the types.
 154  */
 155 #define NULLDFSBNO      ((xfs_dfsbno_t)-1)
 156 #define NULLDRFSBNO     ((xfs_drfsbno_t)-1)
 157 #define NULLDRTBNO      ((xfs_drtbno_t)-1)
 158 #define NULLDFILOFF     ((xfs_dfiloff_t)-1)
 159
 160 #define NULLFSBLOCK     ((xfs_fsblock_t)-1)
 161 #define NULLRFSBLOCK    ((xfs_rfsblock_t)-1)
 162 #define NULLRTBLOCK     ((xfs_rtblock_t)-1)
 163 #define NULLFILEOFF     ((xfs_fileoff_t)-1)
 164
 165 #define NULLAGBLOCK     ((xfs_agblock_t)-1)
 166 #define NULLAGNUMBER    ((xfs_agnumber_t)-1)
 167 #define NULLEXTNUM      ((xfs_extnum_t)-1)
 168
 169 #define NULLCOMMITLSN   ((xfs_lsn_t)-1)
 170
 171 /*
 172  * Max values for extlen, extnum, aextnum.
 173  */
 174 #define MAXEXTLEN       ((xfs_extlen_t)0x001fffff)      /* 21 bits */
 175 #define MAXEXTNUM       ((xfs_extnum_t)0x7fffffff)      /* signed int */
 176 #define MAXAEXTNUM      ((xfs_aextnum_t)0x7fff)         /* signed short */
 177
 178 /*
 179  * MAXNAMELEN is the length (including the terminating null) of
 180  * the longest permissible file (component) name.
 181  */
 182 #define MAXNAMELEN      256
 183
 184 typedef struct xfs_dirent {             /* data from readdir() */
 185         xfs_ino_t       d_ino;          /* inode number of entry */
 186         xfs_off_t       d_off;          /* offset of disk directory entry */
 187         unsigned short  d_reclen;       /* length of this record */
 188         char            d_name[1];      /* name of file */
 189 } xfs_dirent_t;
 190
 191 #define DIRENTBASESIZE          (((xfs_dirent_t *)0)->d_name - (char *)0)
 192 #define DIRENTSIZE(namelen)     \
 193         ((DIRENTBASESIZE + (namelen) + \
 194                 sizeof(xfs_off_t)) & ~(sizeof(xfs_off_t) - 1))
 195
 196 typedef enum {
 197         XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
 198 } xfs_lookup_t;
 199
 200 typedef enum {
 201         XFS_BTNUM_BNOi, XFS_BTNUM_CNTi, XFS_BTNUM_BMAPi, XFS_BTNUM_INOi,
 202         XFS_BTNUM_MAX
 203 } xfs_btnum_t;
 204
 205
 206 /*
 207  * Juggle IRIX device numbers - still used in ondisk structures
 208  */
 209 #define XFS_DEV_BITSMAJOR       14
 210 #define XFS_DEV_BITSMINOR       18
 211 #define XFS_DEV_MAXMAJ          0x1ff
 212 #define XFS_DEV_MAXMIN          0x3ffff
 213 #define XFS_DEV_MAJOR(dev)      ((int)(((unsigned)(dev)>>XFS_DEV_BITSMINOR) \
 214                                     & XFS_DEV_MAXMAJ))
 215 #define XFS_DEV_MINOR(dev)      ((int)((dev)&XFS_DEV_MAXMIN))
 216 #define XFS_MKDEV(major,minor) ((xfs_dev_t)(((major)<<XFS_DEV_BITSMINOR) \
 217                                     | (minor&XFS_DEV_MAXMIN)))
 218
 219 #define XFS_DEV_TO_KDEVT(dev)   mk_kdev(XFS_DEV_MAJOR(dev),XFS_DEV_MINOR(dev))
 220
 221 #endif  /* !__XFS_TYPES_H */