LXR linux/fs/jfs/jfs

   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 */
  41typedef u16 tid_t;
  42typedef u16 lid_t;
  43
  44/*
  45 * Almost identical to Linux's timespec, but not quite
  46 */
  47struct 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 */
  63typedef 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 */
  85struct pxdlist {
  86        s16 maxnpxd;
  87        s16 npxd;
  88        pxd_t pxd[MAXTREEHEIGHT];
  89};
  90
  91
  92/*
  93 *      data extent descriptor (dxd)
  94 */
  95typedef 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 */
 124struct component_name {
 125        int namlen;
 126        wchar_t *name;
 127};
 128
 129
 130/*
 131 *      DASD limit information - stored in directory inode
 132 */
 133struct 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 */
 160