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/*
  34 * transaction and lock id's
  35 *
  36 * Don't change these without carefully considering the impact on the
  37 * size and alignment of all of the linelock variants
  38 */
  39typedef u16 tid_t;
  40typedef u16 lid_t;
  41
  42/*
  43 * Almost identical to Linux's timespec, but not quite
  44 */
  45struct timestruc_t {
  46        __le32 tv_sec;
  47        __le32 tv_nsec;
  48};
  49
  50/*
  51 *      handy
  52 */
  53
  54#define LEFTMOSTONE     0x80000000
  55#define HIGHORDER       0x80000000u     /* high order bit on    */
  56#define ONES            0xffffffffu     /* all bit on           */
  57
  58/*
  59 *      physical xd (pxd)
  60 *
  61 *      The leftmost 24 bits of len_addr are the extent length.
  62 *      The rightmost 8 bits of len_addr are the most signficant bits of
  63 *      the extent address
  64 */
  65typedef struct {
  66        __le32 len_addr;
  67        __le32 addr2;
  68} pxd_t;
  69
  70/* xd_t field construction */
  71
  72static inline void PXDlength(pxd_t *pxd, __u32 len)
  73{
  74        pxd->len_addr = (pxd->len_addr & cpu_to_le32(~0xffffff)) |
  75                        cpu_to_le32(len & 0xffffff);
  76}
  77
  78static inline void PXDaddress(pxd_t *pxd, __u64 addr)
  79{
  80        pxd->len_addr = (pxd->len_addr & cpu_to_le32(0xffffff)) |
  81                        cpu_to_le32((addr >> 32)<<24);
  82        pxd->addr2 = cpu_to_le32(addr & 0xffffffff);
  83}
  84
  85/* xd_t field extraction */
  86static inline __u32 lengthPXD(pxd_t *pxd)
  87{
  88        return le32_to_cpu((pxd)->len_addr) & 0xffffff;
  89}
  90
  91static inline __u64 addressPXD(pxd_t *pxd)
  92{
  93        __u64 n = le32_to_cpu(pxd->len_addr) & ~0xffffff;
  94        return (n << 8) + le32_to_cpu(pxd->addr2);
  95}
  96
  97#define MAXTREEHEIGHT 8
  98/* pxd list */
  99struct pxdlist {
 100        s16 maxnpxd;
 101        s16 npxd;
 102        pxd_t pxd[MAXTREEHEIGHT];
 103};
 104
 105
 106/*
 107 *      data extent descriptor (dxd)
 108 */
 109typedef struct {
 110        __u8 flag;      /* 1: flags */
 111        __u8 rsrvd[3];
 112        __le32 size;            /* 4: size in byte */
 113        pxd_t loc;              /* 8: address and length in unit of fsblksize */
 114} dxd_t;                        /* - 16 - */
 115
 116/* dxd_t flags */
 117#define DXD_INDEX       0x80    /* B+-tree index */
 118#define DXD_INLINE      0x40    /* in-line data extent */
 119#define DXD_EXTENT      0x20    /* out-of-line single extent */
 120#define DXD_FILE        0x10    /* out-of-line file (inode) */
 121#define DXD_CORRUPT     0x08    /* Inconsistency detected */
 122
 123/* dxd_t field construction
 124 */
 125#define DXDlength(dxd, len)     PXDlength(&(dxd)->loc, len)
 126#define DXDaddress(dxd, addr)   PXDaddress(&(dxd)->loc, addr)
 127#define lengthDXD(dxd)  lengthPXD(&(dxd)->loc)
 128#define addressDXD(dxd) addressPXD(&(dxd)->loc)
 129#define DXDsize(dxd, size32) ((dxd)->size = cpu_to_le32(size32))
 130#define sizeDXD(dxd)    le32_to_cpu((dxd)->size)
 131
 132/*
 133 *      directory entry argument
 134 */
 135struct component_name {
 136        int namlen;
 137        wchar_t *name;
 138};
 139
 140
 141/*
 142 *      DASD limit information - stored in directory inode
 143 */
 144struct dasd {
 145        u8 thresh;              /* Alert Threshold (in percent)         */
 146        u8 delta;               /* Alert Threshold delta (in percent)   */
 147        u8 rsrvd1;
 148        u8 limit_hi;            /* DASD limit (in logical blocks)       */
 149        __le32 limit_lo;        /* DASD limit (in logical blocks)       */
 150        u8 rsrvd2[3];
 151        u8 used_hi;             /* DASD usage (in logical blocks)       */
 152        __le32 used_lo;         /* DASD usage (in logical blocks)       */
 153};
 154
 155#define DASDLIMIT(dasdp) \
 156        (((u64)((dasdp)->limit_hi) << 32) + __le32_to_cpu((dasdp)->limit_lo))
 157#define setDASDLIMIT(dasdp, limit)\
 158{\
 159        (dasdp)->limit_hi = ((u64)limit) >> 32;\
 160        (dasdp)->limit_lo = __cpu_to_le32(limit);\
 161}
 162#define DASDUSED(dasdp) \
 163        (((u64)((dasdp)->used_hi) << 32) + __le32_to_cpu((dasdp)->used_lo))
 164#define setDASDUSED(dasdp, used)\
 165{\
 166        (dasdp)->used_hi = ((u64)used) >> 32;\
 167        (dasdp)->used_lo = __cpu_to_le32(used);\
 168}
 169
 170#endif                          /* !_H_JFS_TYPES */
 171