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 | */ |
25 | struct 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 | |
96 | extern int readSuper(struct super_block *, struct buffer_head **); |
97 | extern int updateSuper(struct super_block *, uint); |
98 | __printf(2, 3) |
99 | extern void jfs_error(struct super_block *, const char *, ...); |
100 | extern int jfs_mount(struct super_block *); |
101 | extern int jfs_mount_rw(struct super_block *, int); |
102 | extern int jfs_umount(struct super_block *); |
103 | extern int jfs_umount_rw(struct super_block *); |
104 | extern int jfs_extendfs(struct super_block *, s64, int); |
105 | |
106 | extern struct task_struct *jfsIOthread; |
107 | extern struct task_struct *jfsSyncThread; |
108 | |
109 | #endif /*_H_JFS_SUPERBLOCK */ |
110 | |