1 #ifndef _SYSV_FS_SB
2 #define _SYSV_FS_SB
3
4 /*
5 * SystemV/Coherent super-block data in memory
6 * The SystemV/Coherent superblock contains dynamic data (it gets modified
7 * while the system is running). This is in contrast to the Minix and Berkeley
8 * filesystems (where the superblock is never modified). This affects the
9 * sync() operation: we must keep the superblock in a disk buffer and use this
10 * one as our "working copy".
11 */
12
13 struct sysv_sb_info {
14 int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
15 unsigned int s_block_size; /* zone size, = 512 or = 1024 */
16 unsigned int s_block_size_1; /* block_size - 1 */
17 unsigned int s_block_size_bits; /* log2(block_size) */
18 unsigned int s_block_size_inc_bits; /* log2(block_size/BLOCK_SIZE) if >0 */
19 unsigned int s_block_size_dec_bits; /* log2(BLOCK_SIZE/block_size) if >0 */
20 char s_convert; /* flag whether byte ordering requires conversion */
21 char s_kludge_symlinks; /* flag whether symlinks have a kludgey mode */
22 char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
23 /* if 0: they are disallowed (ENAMETOOLONG) */
24 nlink_t s_link_max; /* max number of hard links to a file */
25 unsigned int s_inodes_per_block; /* number of inodes per block */
26 unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
27 unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
28 unsigned int s_ind_per_block; /* number of indirections per block */
29 unsigned int s_ind_per_block_1; /* ind_per_block - 1 */
30 unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
31 unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
32 unsigned int s_ind_per_block_2_1; /* ind_per_block ^ 2 - 1 */
33 unsigned int s_ind_per_block_2_bits; /* log2(ind_per_block^2) */
34 unsigned int s_ind_per_block_3; /* ind_per_block ^ 3 */
35 unsigned int s_ind_per_block_block_size_1; /* ind_per_block*block_size - 1 */
36 unsigned int s_ind_per_block_block_size_bits; /* log2(ind_per_block*block_size) */
37 unsigned int s_ind_per_block_2_block_size_1; /* ind_per_block^2 * block_size - 1 */
38 unsigned int s_ind_per_block_2_block_size_bits; /* log2(ind_per_block^2 * block_size) */
39 unsigned int s_ind0_size; /* 10 * block_size */
40 unsigned int s_ind1_size; /* (10 + ipb) * block_size */
41 unsigned int s_ind2_size; /* (10 + ipb + ipb^2) * block_size */
42 unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
43 unsigned int s_block_base; /* physical block number of block 0 */
44 unsigned short s_fic_size; /* free inode cache size, NICINOD */
45 unsigned short s_flc_size; /* free block list chunk size, NICFREE */
46 /* The superblock is kept in one or two disk buffers: */
47 struct buffer_head *s_bh1;
48 struct buffer_head *s_bh2;
49 /* These are pointers into the disk buffer, to compensate for
50 different superblock layout. */
51 char * s_sbd1; /* entire superblock data, for part 1 */
52 char * s_sbd2; /* entire superblock data, for part 2 */
53 u16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
54 u16 *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
55 u16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
56 u16 *s_sb_flc_count; /* pointer to s_sbd->s_nfree */
57 u32 *s_sb_flc_blocks; /* pointer to s_sbd->s_free */
58 u32 *s_sb_total_free_blocks;/* pointer to s_sbd->s_tfree */
59 u32 *s_sb_time; /* pointer to s_sbd->s_time */
60 u32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
61 /* We keep those superblock entities that don't change here;
62 this saves us an indirection and perhaps a conversion. */
63 u32 s_firstinodezone; /* index of first inode zone */
64 u32 s_firstdatazone; /* same as s_sbd->s_isize */
65 u32 s_ninodes; /* total number of inodes */
66 u32 s_ndatazones; /* total number of data zones */
67 u32 s_nzones; /* same as s_sbd->s_fsize */
68 };
69 /* The fields s_ind_per_block_2_1, s_toobig_block are currently unused. */
70
71 /* sv_ == u.sysv_sb.s_ */
72 #define sv_type u.sysv_sb.s_type
73 #define sv_block_size u.sysv_sb.s_block_size
74 #define sv_block_size_1 u.sysv_sb.s_block_size_1
75 #define sv_block_size_bits u.sysv_sb.s_block_size_bits
76 #define sv_block_size_inc_bits u.sysv_sb.s_block_size_inc_bits
77 #define sv_block_size_dec_bits u.sysv_sb.s_block_size_dec_bits
78 #define sv_convert u.sysv_sb.s_convert
79 #define sv_kludge_symlinks u.sysv_sb.s_kludge_symlinks
80 #define sv_truncate u.sysv_sb.s_truncate
81 #define sv_link_max u.sysv_sb.s_link_max
82 #define sv_inodes_per_block u.sysv_sb.s_inodes_per_block
83 #define sv_inodes_per_block_1 u.sysv_sb.s_inodes_per_block_1
84 #define sv_inodes_per_block_bits u.sysv_sb.s_inodes_per_block_bits
85 #define sv_ind_per_block u.sysv_sb.s_ind_per_block
86 #define sv_ind_per_block_1 u.sysv_sb.s_ind_per_block_1
87 #define sv_ind_per_block_bits u.sysv_sb.s_ind_per_block_bits
88 #define sv_ind_per_block_2 u.sysv_sb.s_ind_per_block_2
89 #define sv_ind_per_block_2_1 u.sysv_sb.s_ind_per_block_2_1
90 #define sv_ind_per_block_2_bits u.sysv_sb.s_ind_per_block_2_bits
91 #define sv_ind_per_block_3 u.sysv_sb.s_ind_per_block_3
92 #define sv_ind_per_block_block_size_1 u.sysv_sb.s_ind_per_block_block_size_1
93 #define sv_ind_per_block_block_size_bits u.sysv_sb.s_ind_per_block_block_size_bits
94 #define sv_ind_per_block_2_block_size_1 u.sysv_sb.s_ind_per_block_2_block_size_1
95 #define sv_ind_per_block_2_block_size_bits u.sysv_sb.s_ind_per_block_2_block_size_bits
96 #define sv_ind0_size u.sysv_sb.s_ind0_size
97 #define sv_ind1_size u.sysv_sb.s_ind1_size
98 #define sv_ind2_size u.sysv_sb.s_ind2_size
99 #define sv_toobig_block u.sysv_sb.s_toobig_block
100 #define sv_block_base u.sysv_sb.s_block_base
101 #define sv_fic_size u.sysv_sb.s_fic_size
102 #define sv_flc_size u.sysv_sb.s_flc_size
103 #define sv_bh1 u.sysv_sb.s_bh1
104 #define sv_bh2 u.sysv_sb.s_bh2
105 #define sv_sbd1 u.sysv_sb.s_sbd1
106 #define sv_sbd2 u.sysv_sb.s_sbd2
107 #define sv_sb_fic_count u.sysv_sb.s_sb_fic_count
108 #define sv_sb_fic_inodes u.sysv_sb.s_sb_fic_inodes
109 #define sv_sb_total_free_inodes u.sysv_sb.s_sb_total_free_inodes
110 #define sv_sb_flc_count u.sysv_sb.s_sb_flc_count
111 #define sv_sb_flc_blocks u.sysv_sb.s_sb_flc_blocks
112 #define sv_sb_total_free_blocks u.sysv_sb.s_sb_total_free_blocks
113 #define sv_sb_time u.sysv_sb.s_sb_time
114 #define sv_sb_state u.sysv_sb.s_sb_state
115 #define sv_firstinodezone u.sysv_sb.s_firstinodezone
116 #define sv_firstdatazone u.sysv_sb.s_firstdatazone
117 #define sv_ninodes u.sysv_sb.s_ninodes
118 #define sv_ndatazones u.sysv_sb.s_ndatazones
119 #define sv_nzones u.sysv_sb.s_nzones
120
121 #endif
122
123
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