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1.1 root 1: /*
2: * minimal definitions of 4BSD `fast file system' format
3: * just enough to read a disk volume
4: */
5:
6: #define SBLOCK 8192 /* byte offset to (first) super-block */
7: #define SBSIZE 8192 /* size of super-block */
8:
9: /*
10: * contents of super-block
11: */
12:
13: struct fs
14: {
15: struct fs *fs_link; /* linked list of file systems */
16: struct fs *fs_rlink; /* used for incore super blocks */
17: long fs_sblkno; /* addr of super-block in filesys */
18: long fs_cblkno; /* offset of cyl-block in filesys */
19: long fs_iblkno; /* offset of inode-blocks in filesys */
20: long fs_dblkno; /* offset of first data after cg */
21: long fs_cgoffset; /* cylinder group offset in cylinder */
22: long fs_cgmask; /* used to calc mod fs_ntrak */
23: long fs_time; /* last time written */
24: long fs_size; /* number of blocks in fs */
25: long fs_dsize; /* number of data blocks in fs */
26: long fs_ncg; /* number of cylinder groups */
27: long fs_bsize; /* size of basic blocks in fs */
28: long fs_fsize; /* size of frag blocks in fs */
29: long fs_frag; /* number of frags in a block in fs */
30: /* these are configuration parameters */
31: long fs_minfree; /* minimum percentage of free blocks */
32: long fs_rotdelay; /* num of ms for optimal next block */
33: long fs_rps; /* disk revolutions per second */
34: /* these fields can be computed from the others */
35: long fs_bmask; /* ``blkoff'' calc of blk offsets */
36: long fs_fmask; /* ``fragoff'' calc of frag offsets */
37: long fs_bshift; /* ``lblkno'' calc of logical blkno */
38: long fs_fshift; /* ``numfrags'' calc number of frags */
39: /* these are configuration parameters */
40: long fs_maxcontig; /* max number of contiguous blks */
41: long fs_maxbpg; /* max number of blks per cyl group */
42: /* these fields can be computed from the others */
43: long fs_fragshift; /* block to frag shift */
44: long fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
45: long fs_sbsize; /* actual size of super block */
46: long fs_csmask; /* csum block offset */
47: long fs_csshift; /* csum block number */
48: long fs_nindir; /* value of NINDIR */
49: long fs_inopb; /* value of INOPB */
50: long fs_nspf; /* value of NSPF */
51: long fs_optim; /* optimization preference, see below */
52: long fs_sparecon[5]; /* reserved for future constants */
53: /* sizes determined by number of cylinder groups and their sizes */
54: long fs_csaddr; /* blk addr of cyl grp summary area */
55: long fs_cssize; /* size of cyl grp summary area */
56: long fs_cgsize; /* cylinder group size */
57: /* these fields should be derived from the hardware */
58: long fs_ntrak; /* tracks per cylinder */
59: long fs_nsect; /* sectors per track */
60: long fs_spc; /* sectors per cylinder */
61: /* this comes from the disk driver partitioning */
62: long fs_ncyl; /* cylinders in file system */
63: /* these fields can be computed from the others */
64: long fs_cpg; /* cylinders per group */
65: long fs_ipg; /* inodes per group */
66: long fs_fpg; /* blocks per group * fs_frag */
67: #if NOTDEF /* what follows isn't interesting */
68: /* this data must be re-computed after crashes */
69: struct csum fs_cstotal; /* cylinder summary information */
70: /* these fields are cleared at mount time */
71: char fs_fmod; /* super block modified flag */
72: char fs_clean; /* file system is clean flag */
73: char fs_ronly; /* mounted read-only flag */
74: char fs_flags; /* currently unused flag */
75: char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
76: /* these fields retain the current block allocation info */
77: long fs_cgrotor; /* last cg searched */
78: struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */
79: long fs_cpc; /* cyl per cycle in postbl */
80: short fs_postbl[MAXCPG][NRPOS];/* head of blocks for each rotation */
81: long fs_magic; /* magic number */
82: u_char fs_rotbl[1]; /* list of blocks for each rotation */
83: /* actually longer */
84: #endif
85: };
86:
87: #define INOSIZE 128 /* length of inode on disk */
88:
89: #define NDADDR 12
90: #define NIADDR 3
91:
92: /*
93: * inode on disk
94: */
95:
96: struct icommon
97: {
98: short i_mode; /* 0: mode and type of file */
99: short i_nlink; /* 2: number of links to file */
100: short i_uid; /* 4: owner's user id */
101: short i_gid; /* 6: owner's group id */
102: long i_size; /* 8: number of bytes in file */
103: long i_hisize; /* 12: high part of 64-byte size */
104: long i_atime; /* 16: time last accessed */
105: long i_atspare;
106: long i_mtime; /* 24: time last modified */
107: long i_mtspare;
108: long i_ctime; /* 32: last time inode changed */
109: long i_ctspare;
110: long i_db[NDADDR]; /* 40: disk block addresses */
111: long i_ib[NIADDR]; /* 88: indirect blocks */
112: long i_flags; /* 100: status, currently unused */
113: long i_blocks; /* 104: blocks actually held */
114: long i_spare[5]; /* 108: reserved, currently unused */
115: };
116:
117: #define ROOTINO 2
118:
119: /*
120: * directory format
121: */
122:
123: #define MAXNAMLEN 255
124:
125: struct direct {
126: long d_ino; /* inode number of entry */
127: unsigned short d_reclen; /* length of this record */
128: unsigned short d_namlen; /* length of string in d_name */
129: char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
130: };
131:
132: #define DIRSIZ(dp) \
133: ((sizeof (struct direct) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
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