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 /*
  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  */
  39 typedef u16 tid_t;
  40 typedef u16 lid_t;
  41
  42 /*
  43  * Almost identical to Linux's timespec, but not quite
  44  */
  45 struct 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  */
  65 typedef struct {
  66         __le32 len_addr;
  67         __le32 addr2;
  68 } pxd_t;
  69
  70 /* xd_t field construction */
  71
  72 static 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
  78 static 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 */
  86 static inline __u32 lengthPXD(pxd_t *pxd)
  87 {
  88         return le32_to_cpu((pxd)->len_addr) & 0xffffff;
  89 }
  90
  91 static 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 */
  99 struct pxdlist {
 100         s16 maxnpxd;
 101         s16 npxd;
 102         pxd_t pxd[MAXTREEHEIGHT];
 103 };
 104
 105
 106 /*
 107  *      data extent descriptor (dxd)
 108  */
 109 typedef 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  */
 135 struct component_name {
 136         int namlen;
 137         wchar_t *name;
 138 };
 139
 140
 141 /*
 142  *      DASD limit information - stored in directory inode
 143  */
 144 struct 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 */