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sysv_fs.h
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1 #ifndef _LINUX_SYSV_FS_H
2 #define _LINUX_SYSV_FS_H
3 
4 #define __packed2__ __attribute__((packed, aligned(2)))
5 
6 
7 #ifndef __KERNEL__
8 typedef u16 __fs16;
9 typedef u32 __fs16;
10 #endif
11 
12 /* inode numbers are 16 bit */
13 typedef __fs16 sysv_ino_t;
14 
15 /* Block numbers are 24 bit, sometimes stored in 32 bit.
16  On Coherent FS, they are always stored in PDP-11 manner: the least
17  significant 16 bits come last. */
18 typedef __fs32 sysv_zone_t;
19 
20 /* 0 is non-existent */
21 #define SYSV_BADBL_INO 1 /* inode of bad blocks file */
22 #define SYSV_ROOT_INO 2 /* inode of root directory */
23 
24 
25 /* Xenix super-block data on disk */
26 #define XENIX_NICINOD 100 /* number of inode cache entries */
27 #define XENIX_NICFREE 100 /* number of free block list chunk entries */
28 struct xenix_super_block {
29  __fs16 s_isize; /* index of first data zone */
30  __fs32 s_fsize __packed2__; /* total number of zones of this fs */
31  /* the start of the free block list: */
32  __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */
33  sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */
34  /* the cache of free inodes: */
35  __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
36  sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */
37  /* locks, not used by Linux: */
38  char s_flock; /* lock during free block list manipulation */
39  char s_ilock; /* lock during inode cache manipulation */
40  char s_fmod; /* super-block modified flag */
41  char s_ronly; /* flag whether fs is mounted read-only */
42  __fs32 s_time __packed2__; /* time of last super block update */
43  __fs32 s_tfree __packed2__; /* total number of free zones */
44  __fs16 s_tinode; /* total number of free inodes */
45  __fs16 s_dinfo[4]; /* device information ?? */
46  char s_fname[6]; /* file system volume name */
47  char s_fpack[6]; /* file system pack name */
48  char s_clean; /* set to 0x46 when filesystem is properly unmounted */
49  char s_fill[371];
50  s32 s_magic; /* version of file system */
51  __fs32 s_type; /* type of file system: 1 for 512 byte blocks
52  2 for 1024 byte blocks
53  3 for 2048 byte blocks */
54 
55 };
56 
57 /*
58  * SystemV FS comes in two variants:
59  * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
60  * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
61  */
62 #define SYSV_NICINOD 100 /* number of inode cache entries */
63 #define SYSV_NICFREE 50 /* number of free block list chunk entries */
64 
65 /* SystemV4 super-block data on disk */
66 struct sysv4_super_block {
67  __fs16 s_isize; /* index of first data zone */
68  u16 s_pad0;
69  __fs32 s_fsize; /* total number of zones of this fs */
70  /* the start of the free block list: */
71  __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
72  u16 s_pad1;
73  sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */
74  /* the cache of free inodes: */
75  __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */
76  u16 s_pad2;
77  sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */
78  /* locks, not used by Linux: */
79  char s_flock; /* lock during free block list manipulation */
80  char s_ilock; /* lock during inode cache manipulation */
81  char s_fmod; /* super-block modified flag */
82  char s_ronly; /* flag whether fs is mounted read-only */
83  __fs32 s_time; /* time of last super block update */
84  __fs16 s_dinfo[4]; /* device information ?? */
85  __fs32 s_tfree; /* total number of free zones */
86  __fs16 s_tinode; /* total number of free inodes */
87  u16 s_pad3;
88  char s_fname[6]; /* file system volume name */
89  char s_fpack[6]; /* file system pack name */
90  s32 s_fill[12];
91  __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */
92  s32 s_magic; /* version of file system */
93  __fs32 s_type; /* type of file system: 1 for 512 byte blocks
94  2 for 1024 byte blocks */
95 };
96 
97 /* SystemV2 super-block data on disk */
98 struct sysv2_super_block {
99  __fs16 s_isize; /* index of first data zone */
100  __fs32 s_fsize __packed2__; /* total number of zones of this fs */
101  /* the start of the free block list: */
102  __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
103  sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */
104  /* the cache of free inodes: */
105  __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */
106  sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */
107  /* locks, not used by Linux: */
108  char s_flock; /* lock during free block list manipulation */
109  char s_ilock; /* lock during inode cache manipulation */
110  char s_fmod; /* super-block modified flag */
111  char s_ronly; /* flag whether fs is mounted read-only */
112  __fs32 s_time __packed2__; /* time of last super block update */
113  __fs16 s_dinfo[4]; /* device information ?? */
114  __fs32 s_tfree __packed2__; /* total number of free zones */
115  __fs16 s_tinode; /* total number of free inodes */
116  char s_fname[6]; /* file system volume name */
117  char s_fpack[6]; /* file system pack name */
118  s32 s_fill[14];
119  __fs32 s_state; /* file system state: 0xcb096f43 means clean */
120  s32 s_magic; /* version of file system */
121  __fs32 s_type; /* type of file system: 1 for 512 byte blocks
122  2 for 1024 byte blocks */
123 };
124 
125 /* V7 super-block data on disk */
126 #define V7_NICINOD 100 /* number of inode cache entries */
127 #define V7_NICFREE 50 /* number of free block list chunk entries */
128 struct v7_super_block {
129  __fs16 s_isize; /* index of first data zone */
130  __fs32 s_fsize __packed2__; /* total number of zones of this fs */
131  /* the start of the free block list: */
132  __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */
133  sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */
134  /* the cache of free inodes: */
135  __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */
136  sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */
137  /* locks, not used by Linux or V7: */
138  char s_flock; /* lock during free block list manipulation */
139  char s_ilock; /* lock during inode cache manipulation */
140  char s_fmod; /* super-block modified flag */
141  char s_ronly; /* flag whether fs is mounted read-only */
142  __fs32 s_time __packed2__; /* time of last super block update */
143  /* the following fields are not maintained by V7: */
144  __fs32 s_tfree __packed2__; /* total number of free zones */
145  __fs16 s_tinode; /* total number of free inodes */
146  __fs16 s_m; /* interleave factor */
147  __fs16 s_n; /* interleave factor */
148  char s_fname[6]; /* file system name */
149  char s_fpack[6]; /* file system pack name */
150 };
151 /* Constants to aid sanity checking */
152 /* This is not a hard limit, nor enforced by v7 kernel. It's actually just
153  * the limit used by Seventh Edition's ls, though is high enough to assume
154  * that no reasonable file system would have that much entries in root
155  * directory. Thus, if we see anything higher, we just probably got the
156  * endiannes wrong. */
157 #define V7_NFILES 1024
158 /* The disk addresses are three-byte (despite direct block addresses being
159  * aligned word-wise in inode). If the most significant byte is non-zero,
160  * something is most likely wrong (not a filesystem, bad bytesex). */
161 #define V7_MAXSIZE 0x00ffffff
162 
163 /* Coherent super-block data on disk */
164 #define COH_NICINOD 100 /* number of inode cache entries */
165 #define COH_NICFREE 64 /* number of free block list chunk entries */
166 struct coh_super_block {
167  __fs16 s_isize; /* index of first data zone */
168  __fs32 s_fsize __packed2__; /* total number of zones of this fs */
169  /* the start of the free block list: */
170  __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */
171  sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
172  /* the cache of free inodes: */
173  __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */
174  sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */
175  /* locks, not used by Linux: */
176  char s_flock; /* lock during free block list manipulation */
177  char s_ilock; /* lock during inode cache manipulation */
178  char s_fmod; /* super-block modified flag */
179  char s_ronly; /* flag whether fs is mounted read-only */
180  __fs32 s_time __packed2__; /* time of last super block update */
181  __fs32 s_tfree __packed2__; /* total number of free zones */
182  __fs16 s_tinode; /* total number of free inodes */
183  __fs16 s_interleave_m; /* interleave factor */
184  __fs16 s_interleave_n;
185  char s_fname[6]; /* file system volume name */
186  char s_fpack[6]; /* file system pack name */
187  __fs32 s_unique; /* zero, not used */
188 };
189 
190 /* SystemV/Coherent inode data on disk */
191 struct sysv_inode {
192  __fs16 i_mode;
193  __fs16 i_nlink;
194  __fs16 i_uid;
195  __fs16 i_gid;
196  __fs32 i_size;
197  u8 i_data[3*(10+1+1+1)];
198  u8 i_gen;
199  __fs32 i_atime; /* time of last access */
200  __fs32 i_mtime; /* time of last modification */
201  __fs32 i_ctime; /* time of creation */
202 };
203 
204 /* SystemV/Coherent directory entry on disk */
205 #define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */
206 struct sysv_dir_entry {
207  sysv_ino_t inode;
208  char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
209 };
210 
211 #define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */
212 
213 #endif /* _LINUX_SYSV_FS_H */
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