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 
PXDlength(pxd_t * pxd,__u32 len)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 
PXDaddress(pxd_t * pxd,__u64 addr)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 */
lengthPXD(pxd_t * pxd)86 static inline __u32 lengthPXD(pxd_t *pxd)
87 {
88 	return le32_to_cpu((pxd)->len_addr) & 0xffffff;
89 }
90 
addressPXD(pxd_t * pxd)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 */
171