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TOMOYO Linux Cross Reference
Linux/include/linux/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 */
214 

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