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 */
36struct 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
109extern int readSuper(struct super_block *, struct buffer_head **);
110extern int updateSuper(struct super_block *, uint);
111extern void jfs_error(struct super_block *, const char *, ...);
112extern int jfs_mount(struct super_block *);
113extern int jfs_mount_rw(struct super_block *, int);
114extern int jfs_umount(struct super_block *);
115extern int jfs_umount_rw(struct super_block *);
116extern int jfs_extendfs(struct super_block *, s64, int);
117
118extern struct task_struct *jfsIOthread;
119extern struct task_struct *jfsSyncThread;
120
121#endif /*_H_JFS_SUPERBLOCK */
122