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
114
115
116
117
118
119
120
121
122
|
#ifndef _SYSV_FS_SB
#define _SYSV_FS_SB
/*
* SystemV/Coherent super-block data in memory
* The SystemV/Coherent superblock contains dynamic data (it gets modified
* while the system is running). This is in contrast to the Minix and Berkeley
* filesystems (where the superblock is never modified). This affects the
* sync() operation: we must keep the superblock in a disk buffer and use this
* one as our "working copy".
*/
struct sysv_sb_info {
int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
unsigned int s_block_size; /* zone size, = 512 or = 1024 */
unsigned int s_block_size_1; /* block_size - 1 */
unsigned int s_block_size_bits; /* log2(block_size) */
unsigned int s_block_size_inc_bits; /* log2(block_size/BLOCK_SIZE) if >0 */
unsigned int s_block_size_dec_bits; /* log2(BLOCK_SIZE/block_size) if >0 */
char s_convert; /* flag whether byte ordering requires conversion */
char s_kludge_symlinks; /* flag whether symlinks have a kludgey mode */
char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
/* if 0: they are disallowed (ENAMETOOLONG) */
nlink_t s_link_max; /* max number of hard links to a file */
unsigned int s_inodes_per_block; /* number of inodes per block */
unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
unsigned int s_ind_per_block; /* number of indirections per block */
unsigned int s_ind_per_block_1; /* ind_per_block - 1 */
unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
unsigned int s_ind_per_block_2_1; /* ind_per_block ^ 2 - 1 */
unsigned int s_ind_per_block_2_bits; /* log2(ind_per_block^2) */
unsigned int s_ind_per_block_3; /* ind_per_block ^ 3 */
unsigned int s_ind_per_block_block_size_1; /* ind_per_block*block_size - 1 */
unsigned int s_ind_per_block_block_size_bits; /* log2(ind_per_block*block_size) */
unsigned int s_ind_per_block_2_block_size_1; /* ind_per_block^2 * block_size - 1 */
unsigned int s_ind_per_block_2_block_size_bits; /* log2(ind_per_block^2 * block_size) */
unsigned int s_ind0_size; /* 10 * block_size */
unsigned int s_ind1_size; /* (10 + ipb) * block_size */
unsigned int s_ind2_size; /* (10 + ipb + ipb^2) * block_size */
unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
unsigned int s_block_base; /* physical block number of block 0 */
unsigned short s_fic_size; /* free inode cache size, NICINOD */
unsigned short s_flc_size; /* free block list chunk size, NICFREE */
/* The superblock is kept in one or two disk buffers: */
struct buffer_head *s_bh1;
struct buffer_head *s_bh2;
/* These are pointers into the disk buffer, to compensate for
different superblock layout. */
char * s_sbd1; /* entire superblock data, for part 1 */
char * s_sbd2; /* entire superblock data, for part 2 */
u16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
u16 *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
u16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
u16 *s_sb_flc_count; /* pointer to s_sbd->s_nfree */
u32 *s_sb_flc_blocks; /* pointer to s_sbd->s_free */
u32 *s_sb_total_free_blocks;/* pointer to s_sbd->s_tfree */
u32 *s_sb_time; /* pointer to s_sbd->s_time */
u32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
/* We keep those superblock entities that don't change here;
this saves us an indirection and perhaps a conversion. */
u32 s_firstinodezone; /* index of first inode zone */
u32 s_firstdatazone; /* same as s_sbd->s_isize */
u32 s_ninodes; /* total number of inodes */
u32 s_ndatazones; /* total number of data zones */
u32 s_nzones; /* same as s_sbd->s_fsize */
};
/* The fields s_ind_per_block_2_1, s_toobig_block are currently unused. */
/* sv_ == u.sysv_sb.s_ */
#define sv_type u.sysv_sb.s_type
#define sv_block_size u.sysv_sb.s_block_size
#define sv_block_size_1 u.sysv_sb.s_block_size_1
#define sv_block_size_bits u.sysv_sb.s_block_size_bits
#define sv_block_size_inc_bits u.sysv_sb.s_block_size_inc_bits
#define sv_block_size_dec_bits u.sysv_sb.s_block_size_dec_bits
#define sv_convert u.sysv_sb.s_convert
#define sv_kludge_symlinks u.sysv_sb.s_kludge_symlinks
#define sv_truncate u.sysv_sb.s_truncate
#define sv_link_max u.sysv_sb.s_link_max
#define sv_inodes_per_block u.sysv_sb.s_inodes_per_block
#define sv_inodes_per_block_1 u.sysv_sb.s_inodes_per_block_1
#define sv_inodes_per_block_bits u.sysv_sb.s_inodes_per_block_bits
#define sv_ind_per_block u.sysv_sb.s_ind_per_block
#define sv_ind_per_block_1 u.sysv_sb.s_ind_per_block_1
#define sv_ind_per_block_bits u.sysv_sb.s_ind_per_block_bits
#define sv_ind_per_block_2 u.sysv_sb.s_ind_per_block_2
#define sv_ind_per_block_2_1 u.sysv_sb.s_ind_per_block_2_1
#define sv_ind_per_block_2_bits u.sysv_sb.s_ind_per_block_2_bits
#define sv_ind_per_block_3 u.sysv_sb.s_ind_per_block_3
#define sv_ind_per_block_block_size_1 u.sysv_sb.s_ind_per_block_block_size_1
#define sv_ind_per_block_block_size_bits u.sysv_sb.s_ind_per_block_block_size_bits
#define sv_ind_per_block_2_block_size_1 u.sysv_sb.s_ind_per_block_2_block_size_1
#define sv_ind_per_block_2_block_size_bits u.sysv_sb.s_ind_per_block_2_block_size_bits
#define sv_ind0_size u.sysv_sb.s_ind0_size
#define sv_ind1_size u.sysv_sb.s_ind1_size
#define sv_ind2_size u.sysv_sb.s_ind2_size
#define sv_toobig_block u.sysv_sb.s_toobig_block
#define sv_block_base u.sysv_sb.s_block_base
#define sv_fic_size u.sysv_sb.s_fic_size
#define sv_flc_size u.sysv_sb.s_flc_size
#define sv_bh1 u.sysv_sb.s_bh1
#define sv_bh2 u.sysv_sb.s_bh2
#define sv_sbd1 u.sysv_sb.s_sbd1
#define sv_sbd2 u.sysv_sb.s_sbd2
#define sv_sb_fic_count u.sysv_sb.s_sb_fic_count
#define sv_sb_fic_inodes u.sysv_sb.s_sb_fic_inodes
#define sv_sb_total_free_inodes u.sysv_sb.s_sb_total_free_inodes
#define sv_sb_flc_count u.sysv_sb.s_sb_flc_count
#define sv_sb_flc_blocks u.sysv_sb.s_sb_flc_blocks
#define sv_sb_total_free_blocks u.sysv_sb.s_sb_total_free_blocks
#define sv_sb_time u.sysv_sb.s_sb_time
#define sv_sb_state u.sysv_sb.s_sb_state
#define sv_firstinodezone u.sysv_sb.s_firstinodezone
#define sv_firstdatazone u.sysv_sb.s_firstdatazone
#define sv_ninodes u.sysv_sb.s_ninodes
#define sv_ndatazones u.sysv_sb.s_ndatazones
#define sv_nzones u.sysv_sb.s_nzones
#endif
|
