Root/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#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

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