root/fs/jfs/jfs_types.h

INCLUDED FROM

DEFINITIONS

1. PXDlength
2. PXDaddress
3. lengthPXD
4. addressPXD

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *   Copyright (C) International Business Machines Corp., 2000-2004
   4  */
   5 #ifndef _H_JFS_TYPES
   6 #define _H_JFS_TYPES
   7 
   8 /*
   9  *      jfs_types.h:
  10  *
  11  * basic type/utility definitions
  12  *
  13  * note: this header file must be the 1st include file
  14  * of JFS include list in all JFS .c file.
  15  */
  16 
  17 #include <linux/types.h>
  18 #include <linux/nls.h>
  19 
  20 /*
  21  * transaction and lock id's
  22  *
  23  * Don't change these without carefully considering the impact on the
  24  * size and alignment of all of the linelock variants
  25  */
  26 typedef u16 tid_t;
  27 typedef u16 lid_t;
  28 
  29 /*
  30  * Almost identical to Linux's timespec, but not quite
  31  */
  32 struct timestruc_t {
  33         __le32 tv_sec;
  34         __le32 tv_nsec;
  35 };
  36 
  37 /*
  38  *      handy
  39  */
  40 
  41 #define LEFTMOSTONE     0x80000000
  42 #define HIGHORDER       0x80000000u     /* high order bit on    */
  43 #define ONES            0xffffffffu     /* all bit on           */
  44 
  45 /*
  46  *      physical xd (pxd)
  47  *
  48  *      The leftmost 24 bits of len_addr are the extent length.
  49  *      The rightmost 8 bits of len_addr are the most signficant bits of
  50  *      the extent address
  51  */
  52 typedef struct {
  53         __le32 len_addr;
  54         __le32 addr2;
  55 } pxd_t;
  56 
  57 /* xd_t field construction */
  58 
  59 static inline void PXDlength(pxd_t *pxd, __u32 len)
  60 {
  61         pxd->len_addr = (pxd->len_addr & cpu_to_le32(~0xffffff)) |
  62                         cpu_to_le32(len & 0xffffff);
  63 }
  64 
  65 static inline void PXDaddress(pxd_t *pxd, __u64 addr)
  66 {
  67         pxd->len_addr = (pxd->len_addr & cpu_to_le32(0xffffff)) |
  68                         cpu_to_le32((addr >> 32)<<24);
  69         pxd->addr2 = cpu_to_le32(addr & 0xffffffff);
  70 }
  71 
  72 /* xd_t field extraction */
  73 static inline __u32 lengthPXD(pxd_t *pxd)
  74 {
  75         return le32_to_cpu((pxd)->len_addr) & 0xffffff;
  76 }
  77 
  78 static inline __u64 addressPXD(pxd_t *pxd)
  79 {
  80         __u64 n = le32_to_cpu(pxd->len_addr) & ~0xffffff;
  81         return (n << 8) + le32_to_cpu(pxd->addr2);
  82 }
  83 
  84 #define MAXTREEHEIGHT 8
  85 /* pxd list */
  86 struct pxdlist {
  87         s16 maxnpxd;
  88         s16 npxd;
  89         pxd_t pxd[MAXTREEHEIGHT];
  90 };
  91 
  92 
  93 /*
  94  *      data extent descriptor (dxd)
  95  */
  96 typedef struct {
  97         __u8 flag;      /* 1: flags */
  98         __u8 rsrvd[3];
  99         __le32 size;            /* 4: size in byte */
 100         pxd_t loc;              /* 8: address and length in unit of fsblksize */
 101 } dxd_t;                        /* - 16 - */
 102 
 103 /* dxd_t flags */
 104 #define DXD_INDEX       0x80    /* B+-tree index */
 105 #define DXD_INLINE      0x40    /* in-line data extent */
 106 #define DXD_EXTENT      0x20    /* out-of-line single extent */
 107 #define DXD_FILE        0x10    /* out-of-line file (inode) */
 108 #define DXD_CORRUPT     0x08    /* Inconsistency detected */
 109 
 110 /* dxd_t field construction
 111  */
 112 #define DXDlength(dxd, len)     PXDlength(&(dxd)->loc, len)
 113 #define DXDaddress(dxd, addr)   PXDaddress(&(dxd)->loc, addr)
 114 #define lengthDXD(dxd)  lengthPXD(&(dxd)->loc)
 115 #define addressDXD(dxd) addressPXD(&(dxd)->loc)
 116 #define DXDsize(dxd, size32) ((dxd)->size = cpu_to_le32(size32))
 117 #define sizeDXD(dxd)    le32_to_cpu((dxd)->size)
 118 
 119 /*
 120  *      directory entry argument
 121  */
 122 struct component_name {
 123         int namlen;
 124         wchar_t *name;
 125 };
 126 
 127 
 128 /*
 129  *      DASD limit information - stored in directory inode
 130  */
 131 struct dasd {
 132         u8 thresh;              /* Alert Threshold (in percent)         */
 133         u8 delta;               /* Alert Threshold delta (in percent)   */
 134         u8 rsrvd1;
 135         u8 limit_hi;            /* DASD limit (in logical blocks)       */
 136         __le32 limit_lo;        /* DASD limit (in logical blocks)       */
 137         u8 rsrvd2[3];
 138         u8 used_hi;             /* DASD usage (in logical blocks)       */
 139         __le32 used_lo;         /* DASD usage (in logical blocks)       */
 140 };
 141 
 142 #define DASDLIMIT(dasdp) \
 143         (((u64)((dasdp)->limit_hi) << 32) + __le32_to_cpu((dasdp)->limit_lo))
 144 #define setDASDLIMIT(dasdp, limit)\
 145 {\
 146         (dasdp)->limit_hi = ((u64)limit) >> 32;\
 147         (dasdp)->limit_lo = __cpu_to_le32(limit);\
 148 }
 149 #define DASDUSED(dasdp) \
 150         (((u64)((dasdp)->used_hi) << 32) + __le32_to_cpu((dasdp)->used_lo))
 151 #define setDASDUSED(dasdp, used)\
 152 {\
 153         (dasdp)->used_hi = ((u64)used) >> 32;\
 154         (dasdp)->used_lo = __cpu_to_le32(used);\
 155 }
 156 
 157 #endif                          /* !_H_JFS_TYPES */