1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (C) International Business Machines Corp., 2000-2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_JFS_SUPERBLOCK
#define _H_JFS_SUPERBLOCK
/*
* make the magic number something a human could read
*/
#define JFS_MAGIC "JFS1" /* Magic word */
#define JFS_VERSION 2 /* Version number: Version 2 */
#define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
/*
* aggregate superblock
*
* The name superblock is too close to super_block, so the name has been
* changed to jfs_superblock. The utilities are still using the old name.
*/
struct jfs_superblock {
char s_magic[4]; /* 4: magic number */
__le32 s_version; /* 4: version number */
__le64 s_size; /* 8: aggregate size in hardware/LVM blocks;
* VFS: number of blocks
*/
__le32 s_bsize; /* 4: aggregate block size in bytes;
* VFS: fragment size
*/
__le16 s_l2bsize; /* 2: log2 of s_bsize */
__le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
__le32 s_pbsize; /* 4: hardware/LVM block size in bytes */
__le16 s_l2pbsize; /* 2: log2 of s_pbsize */
__le16 pad; /* 2: padding necessary for alignment */
__le32 s_agsize; /* 4: allocation group size in aggr. blocks */
__le32 s_flag; /* 4: aggregate attributes:
* see jfs_filsys.h
*/
__le32 s_state; /* 4: mount/unmount/recovery state:
* see jfs_filsys.h
*/
__le32 s_compress; /* 4: > 0 if data compression */
pxd_t s_ait2; /* 8: first extent of secondary
* aggregate inode table
*/
pxd_t s_aim2; /* 8: first extent of secondary
* aggregate inode map
*/
__le32 s_logdev; /* 4: device address of log */
__le32 s_logserial; /* 4: log serial number at aggregate mount */
pxd_t s_logpxd; /* 8: inline log extent */
pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
struct timestruc_t s_time; /* 8: time last updated */
__le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for
* the fsck service log.
* N.B. These blocks are divided among the
* versions kept. This is not a per
* version size.
* N.B. These blocks are included in the
* length field of s_fsckpxd.
*/
s8 s_fscklog; /* 1: which fsck service log is most recent
* 0 => no service log data yet
* 1 => the first one
* 2 => the 2nd one
*/
char s_fpack[11]; /* 11: file system volume name
* N.B. This must be 11 bytes to
* conform with the OS/2 BootSector
* requirements
* Only used when s_version is 1
*/
/* extendfs() parameter under s_state & FM_EXTENDFS */
__le64 s_xsize; /* 8: extendfs s_size */
pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
pxd_t s_xlogpxd; /* 8: extendfs logpxd */
/* - 128 byte boundary - */
char s_uuid[16]; /* 16: 128-bit uuid for volume */
char s_label[16]; /* 16: volume label */
char s_loguuid[16]; /* 16: 128-bit uuid for log device */
};
extern int readSuper(struct super_block *, struct buffer_head **);
extern int updateSuper(struct super_block *, uint);
extern void jfs_error(struct super_block *, const char *, ...);
#endif /*_H_JFS_SUPERBLOCK */
|
