1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2003
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_SUPERBLOCK
19 #define _H_JFS_SUPERBLOCK
20
21 /*
22 * make the magic number something a human could read
23 */
24 #define JFS_MAGIC "JFS1" /* Magic word */
25
26 #define JFS_VERSION 2 /* Version number: Version 2 */
27
28 #define LV_NAME_SIZE 11 /* MUST BE 11 for OS/2 boot sector */
29
30 /*
31 * aggregate superblock
32 *
33 * The name superblock is too close to super_block, so the name has been
34 * changed to jfs_superblock. The utilities are still using the old name.
35 */
36 struct jfs_superblock {
37 char s_magic[4]; /* 4: magic number */
38 __le32 s_version; /* 4: version number */
39
40 __le64 s_size; /* 8: aggregate size in hardware/LVM blocks;
41 * VFS: number of blocks
42 */
43 __le32 s_bsize; /* 4: aggregate block size in bytes;
44 * VFS: fragment size
45 */
46 __le16 s_l2bsize; /* 2: log2 of s_bsize */
47 __le16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
48 __le32 s_pbsize; /* 4: hardware/LVM block size in bytes */
49 __le16 s_l2pbsize; /* 2: log2 of s_pbsize */
50 __le16 pad; /* 2: padding necessary for alignment */
51
52 __le32 s_agsize; /* 4: allocation group size in aggr. blocks */
53
54 __le32 s_flag; /* 4: aggregate attributes:
55 * see jfs_filsys.h
56 */
57 __le32 s_state; /* 4: mount/unmount/recovery state:
58 * see jfs_filsys.h
59 */
60 __le32 s_compress; /* 4: > 0 if data compression */
61
62 pxd_t s_ait2; /* 8: first extent of secondary
63 * aggregate inode table
64 */
65
66 pxd_t s_aim2; /* 8: first extent of secondary
67 * aggregate inode map
68 */
69 __le32 s_logdev; /* 4: device address of log */
70 __le32 s_logserial; /* 4: log serial number at aggregate mount */
71 pxd_t s_logpxd; /* 8: inline log extent */
72
73 pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
74
75 struct timestruc_t s_time; /* 8: time last updated */
76
77 __le32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for
78 * the fsck service log.
79 * N.B. These blocks are divided among the
80 * versions kept. This is not a per
81 * version size.
82 * N.B. These blocks are included in the
83 * length field of s_fsckpxd.
84 */
85 s8 s_fscklog; /* 1: which fsck service log is most recent
86 * 0 => no service log data yet
87 * 1 => the first one
88 * 2 => the 2nd one
89 */
90 char s_fpack[11]; /* 11: file system volume name
91 * N.B. This must be 11 bytes to
92 * conform with the OS/2 BootSector
93 * requirements
94 * Only used when s_version is 1
95 */
96
97 /* extendfs() parameter under s_state & FM_EXTENDFS */
98 __le64 s_xsize; /* 8: extendfs s_size */
99 pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
100 pxd_t s_xlogpxd; /* 8: extendfs logpxd */
101 /* - 128 byte boundary - */
102
103 char s_uuid[16]; /* 16: 128-bit uuid for volume */
104 char s_label[16]; /* 16: volume label */
105 char s_loguuid[16]; /* 16: 128-bit uuid for log device */
106
107 };
108
109 extern int readSuper(struct super_block *, struct buffer_head **);
110 extern int updateSuper(struct super_block *, uint);
111 extern void jfs_error(struct super_block *, const char *, ...);
112
113 #endif /*_H_JFS_SUPERBLOCK */
114
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