fs/jfs/jfs_types.h

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *
   4  *   This program is free software;  you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  12  *   the 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 to the Free Software
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18 #ifndef _H_JFS_TYPES
  19 #define _H_JFS_TYPES
  20
  21 /*
  22  *      jfs_types.h:
  23  *
  24  * basic type/utility definitions
  25  *
  26  * note: this header file must be the 1st include file
  27  * of JFS include list in all JFS .c file.
  28  */
  29
  30 #include <linux/types.h>
  31 #include <linux/nls.h>
  32
  33 #include "endian24.h"
  34
  35 /*
  36  * transaction and lock id's
  37  *
  38  * Don't change these without carefully considering the impact on the
  39  * size and alignment of all of the linelock variants
  40  */
  41 typedef u16 tid_t;
  42 typedef u16 lid_t;
  43
  44 /*
  45  * Almost identical to Linux's timespec, but not quite
  46  */
  47 struct timestruc_t {
  48         __le32 tv_sec;
  49         __le32 tv_nsec;
  50 };
  51
  52 /*
  53  *      handy
  54  */
  55
  56 #define LEFTMOSTONE     0x80000000
  57 #define HIGHORDER       0x80000000u     /* high order bit on    */
  58 #define ONES            0xffffffffu     /* all bit on           */
  59
  60 /*
  61  *      physical xd (pxd)
  62  */
  63 typedef struct {
  64         unsigned len:24;
  65         unsigned addr1:8;
  66         __le32 addr2;
  67 } pxd_t;
  68
  69 /* xd_t field construction */
  70
  71 #define PXDlength(pxd, length32)        ((pxd)->len = __cpu_to_le24(length32))
  72 #define PXDaddress(pxd, address64)\
  73 {\
  74         (pxd)->addr1 = ((s64)address64) >> 32;\
  75         (pxd)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
  76 }
  77
  78 /* xd_t field extraction */
  79 #define lengthPXD(pxd)  __le24_to_cpu((pxd)->len)
  80 #define addressPXD(pxd)\
  81         ( ((s64)((pxd)->addr1)) << 32 | __le32_to_cpu((pxd)->addr2))
  82
  83 #define MAXTREEHEIGHT 8
  84 /* pxd list */
  85 struct pxdlist {
  86         s16 maxnpxd;
  87         s16 npxd;
  88         pxd_t pxd[MAXTREEHEIGHT];
  89 };
  90
  91
  92 /*
  93  *      data extent descriptor (dxd)
  94  */
  95 typedef struct {
  96         unsigned flag:8;        /* 1: flags */
  97         unsigned rsrvd:24;
  98         __le32 size;            /* 4: size in byte */
  99         unsigned len:24;        /* 3: length in unit of fsblksize */
 100         unsigned addr1:8;       /* 1: address in unit of fsblksize */
 101         __le32 addr2;           /* 4: address in unit of fsblksize */
 102 } dxd_t;                        /* - 16 - */
 103
 104 /* dxd_t flags */
 105 #define DXD_INDEX       0x80    /* B+-tree index */
 106 #define DXD_INLINE      0x40    /* in-line data extent */
 107 #define DXD_EXTENT      0x20    /* out-of-line single extent */
 108 #define DXD_FILE        0x10    /* out-of-line file (inode) */
 109 #define DXD_CORRUPT     0x08    /* Inconsistency detected */
 110
 111 /* dxd_t field construction
 112  *      Conveniently, the PXD macros work for DXD
 113  */
 114 #define DXDlength       PXDlength
 115 #define DXDaddress      PXDaddress
 116 #define lengthDXD       lengthPXD
 117 #define addressDXD      addressPXD
 118 #define DXDsize(dxd, size32) ((dxd)->size = cpu_to_le32(size32))
 119 #define sizeDXD(dxd)    le32_to_cpu((dxd)->size)
 120
 121 /*
 122  *      directory entry argument
 123  */
 124 struct component_name {
 125         int namlen;
 126         wchar_t *name;
 127 };
 128
 129
 130 /*
 131  *      DASD limit information - stored in directory inode
 132  */
 133 struct dasd {
 134         u8 thresh;              /* Alert Threshold (in percent)         */
 135         u8 delta;               /* Alert Threshold delta (in percent)   */
 136         u8 rsrvd1;
 137         u8 limit_hi;            /* DASD limit (in logical blocks)       */
 138         __le32 limit_lo;        /* DASD limit (in logical blocks)       */
 139         u8 rsrvd2[3];
 140         u8 used_hi;             /* DASD usage (in logical blocks)       */
 141         __le32 used_lo;         /* DASD usage (in logical blocks)       */
 142 };
 143
 144 #define DASDLIMIT(dasdp) \
 145         (((u64)((dasdp)->limit_hi) << 32) + __le32_to_cpu((dasdp)->limit_lo))
 146 #define setDASDLIMIT(dasdp, limit)\
 147 {\
 148         (dasdp)->limit_hi = ((u64)limit) >> 32;\
 149         (dasdp)->limit_lo = __cpu_to_le32(limit);\
 150 }
 151 #define DASDUSED(dasdp) \
 152         (((u64)((dasdp)->used_hi) << 32) + __le32_to_cpu((dasdp)->used_lo))
 153 #define setDASDUSED(dasdp, used)\
 154 {\
 155         (dasdp)->used_hi = ((u64)used) >> 32;\
 156         (dasdp)->used_lo = __cpu_to_le32(used);\
 157 }
 158
 159 #endif                          /* !_H_JFS_TYPES */