Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.9 / ca9cfea09fc5802074f79d086547c6363ddc894b / . / include / linux / sysv_fs.h
blob: e47d6d90023dbd55794134f8a86035c8e629820e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1#ifndef _LINUX_SYSV_FS_H
2#define _LINUX_SYSV_FS_H
3
Robert P. J. Daydddfbaf2008-04-29 01:03:26 -0700[diff] [blame]4#define __packed2__ __attribute__((packed, aligned(2)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]5
6
7#ifndef __KERNEL__
8typedef u16 __fs16;
9typedef u32 __fs16;
10#endif
11
12/* inode numbers are 16 bit */
13typedef __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. */
18typedef __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 */
28struct 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 */
66struct 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 */
98struct 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 */
128struct 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};
Lubomir Rintel0bcaa652010-08-10 18:03:33 -0700[diff] [blame]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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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 */
166struct 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 */
191struct 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 */
206struct 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 */