fs/jfs/jfs_types.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  *   Copyright (C) International Business Machines Corp., 2000-2004
0004  */
0005 #ifndef _H_JFS_TYPES
0006 #define _H_JFS_TYPES
0007
0008 /*
0009  *  jfs_types.h:
0010  *
0011  * basic type/utility definitions
0012  *
0013  * note: this header file must be the 1st include file
0014  * of JFS include list in all JFS .c file.
0015  */
0016
0017 #include <linux/types.h>
0018 #include <linux/nls.h>
0019
0020 /*
0021  * transaction and lock id's
0022  *
0023  * Don't change these without carefully considering the impact on the
0024  * size and alignment of all of the linelock variants
0025  */
0026 typedef u16 tid_t;
0027 typedef u16 lid_t;
0028
0029 /*
0030  * Almost identical to Linux's timespec, but not quite
0031  */
0032 struct timestruc_t {
0033     __le32 tv_sec;
0034     __le32 tv_nsec;
0035 };
0036
0037 /*
0038  *  handy
0039  */
0040
0041 #define LEFTMOSTONE 0x80000000
0042 #define HIGHORDER   0x80000000u /* high order bit on    */
0043 #define ONES        0xffffffffu /* all bit on       */
0044
0045 /*
0046  *  physical xd (pxd)
0047  *
0048  *  The leftmost 24 bits of len_addr are the extent length.
0049  *  The rightmost 8 bits of len_addr are the most signficant bits of
0050  *  the extent address
0051  */
0052 typedef struct {
0053     __le32 len_addr;
0054     __le32 addr2;
0055 } pxd_t;
0056
0057 /* xd_t field construction */
0058
0059 static inline void PXDlength(pxd_t *pxd, __u32 len)
0060 {
0061     pxd->len_addr = (pxd->len_addr & cpu_to_le32(~0xffffff)) |
0062             cpu_to_le32(len & 0xffffff);
0063 }
0064
0065 static inline void PXDaddress(pxd_t *pxd, __u64 addr)
0066 {
0067     pxd->len_addr = (pxd->len_addr & cpu_to_le32(0xffffff)) |
0068             cpu_to_le32((addr >> 32)<<24);
0069     pxd->addr2 = cpu_to_le32(addr & 0xffffffff);
0070 }
0071
0072 /* xd_t field extraction */
0073 static inline __u32 lengthPXD(pxd_t *pxd)
0074 {
0075     return le32_to_cpu((pxd)->len_addr) & 0xffffff;
0076 }
0077
0078 static inline __u64 addressPXD(pxd_t *pxd)
0079 {
0080     __u64 n = le32_to_cpu(pxd->len_addr) & ~0xffffff;
0081     return (n << 8) + le32_to_cpu(pxd->addr2);
0082 }
0083
0084 #define MAXTREEHEIGHT 8
0085 /* pxd list */
0086 struct pxdlist {
0087     s16 maxnpxd;
0088     s16 npxd;
0089     pxd_t pxd[MAXTREEHEIGHT];
0090 };
0091
0092
0093 /*
0094  *  data extent descriptor (dxd)
0095  */
0096 typedef struct {
0097     __u8 flag;  /* 1: flags */
0098     __u8 rsrvd[3];
0099     __le32 size;        /* 4: size in byte */
0100     pxd_t loc;      /* 8: address and length in unit of fsblksize */
0101 } dxd_t;            /* - 16 - */
0102
0103 /* dxd_t flags */
0104 #define DXD_INDEX   0x80    /* B+-tree index */
0105 #define DXD_INLINE  0x40    /* in-line data extent */
0106 #define DXD_EXTENT  0x20    /* out-of-line single extent */
0107 #define DXD_FILE    0x10    /* out-of-line file (inode) */
0108 #define DXD_CORRUPT 0x08    /* Inconsistency detected */
0109
0110 /* dxd_t field construction
0111  */
0112 #define DXDlength(dxd, len) PXDlength(&(dxd)->loc, len)
0113 #define DXDaddress(dxd, addr)   PXDaddress(&(dxd)->loc, addr)
0114 #define lengthDXD(dxd)  lengthPXD(&(dxd)->loc)
0115 #define addressDXD(dxd) addressPXD(&(dxd)->loc)
0116 #define DXDsize(dxd, size32) ((dxd)->size = cpu_to_le32(size32))
0117 #define sizeDXD(dxd)    le32_to_cpu((dxd)->size)
0118
0119 /*
0120  *  directory entry argument
0121  */
0122 struct component_name {
0123     int namlen;
0124     wchar_t *name;
0125 };
0126
0127
0128 /*
0129  *  DASD limit information - stored in directory inode
0130  */
0131 struct dasd {
0132     u8 thresh;      /* Alert Threshold (in percent)     */
0133     u8 delta;       /* Alert Threshold delta (in percent)   */
0134     u8 rsrvd1;
0135     u8 limit_hi;        /* DASD limit (in logical blocks)   */
0136     __le32 limit_lo;    /* DASD limit (in logical blocks)   */
0137     u8 rsrvd2[3];
0138     u8 used_hi;     /* DASD usage (in logical blocks)   */
0139     __le32 used_lo;     /* DASD usage (in logical blocks)   */
0140 };
0141
0142 #define DASDLIMIT(dasdp) \
0143     (((u64)((dasdp)->limit_hi) << 32) + __le32_to_cpu((dasdp)->limit_lo))
0144 #define setDASDLIMIT(dasdp, limit)\
0145 {\
0146     (dasdp)->limit_hi = ((u64)limit) >> 32;\
0147     (dasdp)->limit_lo = __cpu_to_le32(limit);\
0148 }
0149 #define DASDUSED(dasdp) \
0150     (((u64)((dasdp)->used_hi) << 32) + __le32_to_cpu((dasdp)->used_lo))
0151 #define setDASDUSED(dasdp, used)\
0152 {\
0153     (dasdp)->used_hi = ((u64)used) >> 32;\
0154     (dasdp)->used_lo = __cpu_to_le32(used);\
0155 }
0156
0157 #endif              /* !_H_JFS_TYPES */