1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *   Copyright (C) International Business Machines Corp., 2000-2003
4 */
5#ifndef	_H_JFS_SUPERBLOCK
6#define _H_JFS_SUPERBLOCK
7
8#include <linux/uuid.h>
9
10/*
11 * make the magic number something a human could read
12 */
13#define JFS_MAGIC	"JFS1"	/* Magic word */
14
15#define JFS_VERSION	2	/* Version number: Version 2 */
16
17#define LV_NAME_SIZE	11	/* MUST BE 11 for OS/2 boot sector */
18
19/*
20 *	aggregate superblock
21 *
22 * The name superblock is too close to super_block, so the name has been
23 * changed to jfs_superblock.  The utilities are still using the old name.
24 */
25struct jfs_superblock {
26	char s_magic[4];	/* 4: magic number */
27	__le32 s_version;	/* 4: version number */
28
29	__le64 s_size;		/* 8: aggregate size in hardware/LVM blocks;
30				 * VFS: number of blocks
31				 */
32	__le32 s_bsize;		/* 4: aggregate block size in bytes;
33				 * VFS: fragment size
34				 */
35	__le16 s_l2bsize;	/* 2: log2 of s_bsize */
36	__le16 s_l2bfactor;	/* 2: log2(s_bsize/hardware block size) */
37	__le32 s_pbsize;	/* 4: hardware/LVM block size in bytes */
38	__le16 s_l2pbsize;	/* 2: log2 of s_pbsize */
39	__le16 pad;		/* 2: padding necessary for alignment */
40
41	__le32 s_agsize;	/* 4: allocation group size in aggr. blocks */
42
43	__le32 s_flag;		/* 4: aggregate attributes:
44				 *    see jfs_filsys.h
45				 */
46	__le32 s_state;		/* 4: mount/unmount/recovery state:
47				 *    see jfs_filsys.h
48				 */
49	__le32 s_compress;		/* 4: > 0 if data compression */
50
51	pxd_t s_ait2;		/* 8: first extent of secondary
52				 *    aggregate inode table
53				 */
54
55	pxd_t s_aim2;		/* 8: first extent of secondary
56				 *    aggregate inode map
57				 */
58	__le32 s_logdev;		/* 4: device address of log */
59	__le32 s_logserial;	/* 4: log serial number at aggregate mount */
60	pxd_t s_logpxd;		/* 8: inline log extent */
61
62	pxd_t s_fsckpxd;	/* 8: inline fsck work space extent */
63
64	struct timestruc_t s_time;	/* 8: time last updated */
65
66	__le32 s_fsckloglen;	/* 4: Number of filesystem blocks reserved for
67				 *    the fsck service log.
68				 *    N.B. These blocks are divided among the
69				 *         versions kept.  This is not a per
70				 *         version size.
71				 *    N.B. These blocks are included in the
72				 *         length field of s_fsckpxd.
73				 */
74	s8 s_fscklog;		/* 1: which fsck service log is most recent
75				 *    0 => no service log data yet
76				 *    1 => the first one
77				 *    2 => the 2nd one
78				 */
79	char s_fpack[11];	/* 11: file system volume name
80				 *     N.B. This must be 11 bytes to
81				 *          conform with the OS/2 BootSector
82				 *          requirements
83				 *          Only used when s_version is 1
84				 */
85
86	/* extendfs() parameter under s_state & FM_EXTENDFS */
87	__le64 s_xsize;		/* 8: extendfs s_size */
88	pxd_t s_xfsckpxd;	/* 8: extendfs fsckpxd */
89	pxd_t s_xlogpxd;	/* 8: extendfs logpxd */
90	uuid_t s_uuid;		/* 16: 128-bit uuid for volume */
91	char s_label[16];	/* 16: volume label */
92	uuid_t s_loguuid;	/* 16: 128-bit uuid for log device */
93
94};
95
96extern int readSuper(struct super_block *, struct buffer_head **);
97extern int updateSuper(struct super_block *, uint);
98__printf(2, 3)
99extern void jfs_error(struct super_block *, const char *, ...);
100extern int jfs_mount(struct super_block *);
101extern int jfs_mount_rw(struct super_block *, int);
102extern int jfs_umount(struct super_block *);
103extern int jfs_umount_rw(struct super_block *);
104extern int jfs_extendfs(struct super_block *, s64, int);
105
106extern struct task_struct *jfsIOthread;
107extern struct task_struct *jfsSyncThread;
108
109#endif /*_H_JFS_SUPERBLOCK */
110