1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_SYSV_FS_H |
3 | #define _LINUX_SYSV_FS_H |
4 | |
5 | #define __packed2__ __attribute__((packed, aligned(2))) |
6 | |
7 | |
8 | #ifndef __KERNEL__ |
9 | typedef u16 __fs16; |
10 | typedef u32 __fs16; |
11 | #endif |
12 | |
13 | /* inode numbers are 16 bit */ |
14 | typedef __fs16 sysv_ino_t; |
15 | |
16 | /* Block numbers are 24 bit, sometimes stored in 32 bit. |
17 | On Coherent FS, they are always stored in PDP-11 manner: the least |
18 | significant 16 bits come last. */ |
19 | typedef __fs32 sysv_zone_t; |
20 | |
21 | /* 0 is non-existent */ |
22 | #define SYSV_BADBL_INO 1 /* inode of bad blocks file */ |
23 | #define SYSV_ROOT_INO 2 /* inode of root directory */ |
24 | |
25 | |
26 | /* Xenix super-block data on disk */ |
27 | #define XENIX_NICINOD 100 /* number of inode cache entries */ |
28 | #define XENIX_NICFREE 100 /* number of free block list chunk entries */ |
29 | struct xenix_super_block { |
30 | __fs16 s_isize; /* index of first data zone */ |
31 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
32 | /* the start of the free block list: */ |
33 | __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */ |
34 | sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */ |
35 | /* the cache of free inodes: */ |
36 | __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */ |
37 | sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */ |
38 | /* locks, not used by Linux: */ |
39 | char s_flock; /* lock during free block list manipulation */ |
40 | char s_ilock; /* lock during inode cache manipulation */ |
41 | char s_fmod; /* super-block modified flag */ |
42 | char s_ronly; /* flag whether fs is mounted read-only */ |
43 | __fs32 s_time __packed2__; /* time of last super block update */ |
44 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
45 | __fs16 s_tinode; /* total number of free inodes */ |
46 | __fs16 s_dinfo[4]; /* device information ?? */ |
47 | char s_fname[6]; /* file system volume name */ |
48 | char s_fpack[6]; /* file system pack name */ |
49 | char s_clean; /* set to 0x46 when filesystem is properly unmounted */ |
50 | char s_fill[371]; |
51 | s32 s_magic; /* version of file system */ |
52 | __fs32 s_type; /* type of file system: 1 for 512 byte blocks |
53 | 2 for 1024 byte blocks |
54 | 3 for 2048 byte blocks */ |
55 | |
56 | }; |
57 | |
58 | /* |
59 | * SystemV FS comes in two variants: |
60 | * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). |
61 | * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). |
62 | */ |
63 | #define SYSV_NICINOD 100 /* number of inode cache entries */ |
64 | #define SYSV_NICFREE 50 /* number of free block list chunk entries */ |
65 | |
66 | /* SystemV4 super-block data on disk */ |
67 | struct sysv4_super_block { |
68 | __fs16 s_isize; /* index of first data zone */ |
69 | u16 s_pad0; |
70 | __fs32 s_fsize; /* total number of zones of this fs */ |
71 | /* the start of the free block list: */ |
72 | __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
73 | u16 s_pad1; |
74 | sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ |
75 | /* the cache of free inodes: */ |
76 | __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
77 | u16 s_pad2; |
78 | sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
79 | /* locks, not used by Linux: */ |
80 | char s_flock; /* lock during free block list manipulation */ |
81 | char s_ilock; /* lock during inode cache manipulation */ |
82 | char s_fmod; /* super-block modified flag */ |
83 | char s_ronly; /* flag whether fs is mounted read-only */ |
84 | __fs32 s_time; /* time of last super block update */ |
85 | __fs16 s_dinfo[4]; /* device information ?? */ |
86 | __fs32 s_tfree; /* total number of free zones */ |
87 | __fs16 s_tinode; /* total number of free inodes */ |
88 | u16 s_pad3; |
89 | char s_fname[6]; /* file system volume name */ |
90 | char s_fpack[6]; /* file system pack name */ |
91 | s32 s_fill[12]; |
92 | __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */ |
93 | s32 s_magic; /* version of file system */ |
94 | __fs32 s_type; /* type of file system: 1 for 512 byte blocks |
95 | 2 for 1024 byte blocks */ |
96 | }; |
97 | |
98 | /* SystemV2 super-block data on disk */ |
99 | struct sysv2_super_block { |
100 | __fs16 s_isize; /* index of first data zone */ |
101 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
102 | /* the start of the free block list: */ |
103 | __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */ |
104 | sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */ |
105 | /* the cache of free inodes: */ |
106 | __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */ |
107 | sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */ |
108 | /* locks, not used by Linux: */ |
109 | char s_flock; /* lock during free block list manipulation */ |
110 | char s_ilock; /* lock during inode cache manipulation */ |
111 | char s_fmod; /* super-block modified flag */ |
112 | char s_ronly; /* flag whether fs is mounted read-only */ |
113 | __fs32 s_time __packed2__; /* time of last super block update */ |
114 | __fs16 s_dinfo[4]; /* device information ?? */ |
115 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
116 | __fs16 s_tinode; /* total number of free inodes */ |
117 | char s_fname[6]; /* file system volume name */ |
118 | char s_fpack[6]; /* file system pack name */ |
119 | s32 s_fill[14]; |
120 | __fs32 s_state; /* file system state: 0xcb096f43 means clean */ |
121 | s32 s_magic; /* version of file system */ |
122 | __fs32 s_type; /* type of file system: 1 for 512 byte blocks |
123 | 2 for 1024 byte blocks */ |
124 | }; |
125 | |
126 | /* V7 super-block data on disk */ |
127 | #define V7_NICINOD 100 /* number of inode cache entries */ |
128 | #define V7_NICFREE 50 /* number of free block list chunk entries */ |
129 | struct v7_super_block { |
130 | __fs16 s_isize; /* index of first data zone */ |
131 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
132 | /* the start of the free block list: */ |
133 | __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */ |
134 | sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */ |
135 | /* the cache of free inodes: */ |
136 | __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */ |
137 | sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */ |
138 | /* locks, not used by Linux or V7: */ |
139 | char s_flock; /* lock during free block list manipulation */ |
140 | char s_ilock; /* lock during inode cache manipulation */ |
141 | char s_fmod; /* super-block modified flag */ |
142 | char s_ronly; /* flag whether fs is mounted read-only */ |
143 | __fs32 s_time __packed2__; /* time of last super block update */ |
144 | /* the following fields are not maintained by V7: */ |
145 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
146 | __fs16 s_tinode; /* total number of free inodes */ |
147 | __fs16 s_m; /* interleave factor */ |
148 | __fs16 s_n; /* interleave factor */ |
149 | char s_fname[6]; /* file system name */ |
150 | char s_fpack[6]; /* file system pack name */ |
151 | }; |
152 | /* Constants to aid sanity checking */ |
153 | /* This is not a hard limit, nor enforced by v7 kernel. It's actually just |
154 | * the limit used by Seventh Edition's ls, though is high enough to assume |
155 | * that no reasonable file system would have that much entries in root |
156 | * directory. Thus, if we see anything higher, we just probably got the |
157 | * endiannes wrong. */ |
158 | #define V7_NFILES 1024 |
159 | /* The disk addresses are three-byte (despite direct block addresses being |
160 | * aligned word-wise in inode). If the most significant byte is non-zero, |
161 | * something is most likely wrong (not a filesystem, bad bytesex). */ |
162 | #define V7_MAXSIZE 0x00ffffff |
163 | |
164 | /* Coherent super-block data on disk */ |
165 | #define COH_NICINOD 100 /* number of inode cache entries */ |
166 | #define COH_NICFREE 64 /* number of free block list chunk entries */ |
167 | struct coh_super_block { |
168 | __fs16 s_isize; /* index of first data zone */ |
169 | __fs32 s_fsize __packed2__; /* total number of zones of this fs */ |
170 | /* the start of the free block list: */ |
171 | __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */ |
172 | sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */ |
173 | /* the cache of free inodes: */ |
174 | __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */ |
175 | sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */ |
176 | /* locks, not used by Linux: */ |
177 | char s_flock; /* lock during free block list manipulation */ |
178 | char s_ilock; /* lock during inode cache manipulation */ |
179 | char s_fmod; /* super-block modified flag */ |
180 | char s_ronly; /* flag whether fs is mounted read-only */ |
181 | __fs32 s_time __packed2__; /* time of last super block update */ |
182 | __fs32 s_tfree __packed2__; /* total number of free zones */ |
183 | __fs16 s_tinode; /* total number of free inodes */ |
184 | __fs16 s_interleave_m; /* interleave factor */ |
185 | __fs16 s_interleave_n; |
186 | char s_fname[6]; /* file system volume name */ |
187 | char s_fpack[6]; /* file system pack name */ |
188 | __fs32 s_unique; /* zero, not used */ |
189 | }; |
190 | |
191 | /* SystemV/Coherent inode data on disk */ |
192 | struct sysv_inode { |
193 | __fs16 i_mode; |
194 | __fs16 i_nlink; |
195 | __fs16 i_uid; |
196 | __fs16 i_gid; |
197 | __fs32 i_size; |
198 | u8 i_data[3*(10+1+1+1)]; |
199 | u8 i_gen; |
200 | __fs32 i_atime; /* time of last access */ |
201 | __fs32 i_mtime; /* time of last modification */ |
202 | __fs32 i_ctime; /* time of creation */ |
203 | }; |
204 | |
205 | /* SystemV/Coherent directory entry on disk */ |
206 | #define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */ |
207 | struct sysv_dir_entry { |
208 | sysv_ino_t inode; |
209 | char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */ |
210 | }; |
211 | |
212 | #define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */ |
213 | |
214 | #endif /* _LINUX_SYSV_FS_H */ |
215 | |