include/linux/sysv_fs.h

   1 #ifndef _LINUX_SYSV_FS_H
   2 #define _LINUX_SYSV_FS_H
   3
   4 #if defined(__GNUC__)
   5 # define __packed2__    __attribute__((packed, aligned(2)))
   6 #else
   7 >> I want to scream! <<
   8 #endif
   9
  10
  11 /* inode numbers are 16 bit */
  12 typedef u16 sysv_ino_t;
  13
  14 /* Block numbers are 24 bit, sometimes stored in 32 bit.
  15    On Coherent FS, they are always stored in PDP-11 manner: the least
  16    significant 16 bits come last. */
  17 typedef u32 sysv_zone_t;
  18
  19 /* 0 is non-existent */
  20 #define SYSV_BADBL_INO  1       /* inode of bad blocks file */
  21 #define SYSV_ROOT_INO   2       /* inode of root directory */
  22
  23
  24 /* Xenix super-block data on disk */
  25 #define XENIX_NICINOD   100     /* number of inode cache entries */
  26 #define XENIX_NICFREE   100     /* number of free block list chunk entries */
  27 struct xenix_super_block {
  28         u16             s_isize; /* index of first data zone */
  29         u32             s_fsize __packed2__; /* total number of zones of this fs */
  30         /* the start of the free block list: */
  31         u16             s_nfree;        /* number of free blocks in s_free, <= XENIX_NICFREE */
  32         u32             s_free[XENIX_NICFREE]; /* first free block list chunk */
  33         /* the cache of free inodes: */
  34         u16             s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
  35         sysv_ino_t      s_inode[XENIX_NICINOD]; /* some free inodes */
  36         /* locks, not used by Linux: */
  37         char            s_flock;        /* lock during free block list manipulation */
  38         char            s_ilock;        /* lock during inode cache manipulation */
  39         char            s_fmod;         /* super-block modified flag */
  40         char            s_ronly;        /* flag whether fs is mounted read-only */
  41         u32             s_time __packed2__; /* time of last super block update */
  42         u32             s_tfree __packed2__; /* total number of free zones */
  43         u16             s_tinode;       /* total number of free inodes */
  44         s16             s_dinfo[4];     /* device information ?? */
  45         char            s_fname[6];     /* file system volume name */
  46         char            s_fpack[6];     /* file system pack name */
  47         char            s_clean;        /* set to 0x46 when filesystem is properly unmounted */
  48         char            s_fill[371];
  49         s32             s_magic;        /* version of file system */
  50         s32             s_type;         /* type of file system: 1 for 512 byte blocks
  51                                                                 2 for 1024 byte blocks
  52                                                                 3 for 2048 byte blocks */
  53
  54 };
  55
  56 /*
  57  * SystemV FS comes in two variants:
  58  * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
  59  * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
  60  */
  61 #define SYSV_NICINOD    100     /* number of inode cache entries */
  62 #define SYSV_NICFREE    50      /* number of free block list chunk entries */
  63
  64 /* SystemV4 super-block data on disk */
  65 struct sysv4_super_block {
  66         u16     s_isize;        /* index of first data zone */
  67         u16     s_pad0;
  68         u32     s_fsize;        /* total number of zones of this fs */
  69         /* the start of the free block list: */
  70         u16     s_nfree;        /* number of free blocks in s_free, <= SYSV_NICFREE */
  71         u16     s_pad1;
  72         u32     s_free[SYSV_NICFREE]; /* first free block list chunk */
  73         /* the cache of free inodes: */
  74         u16     s_ninode;       /* number of free inodes in s_inode, <= SYSV_NICINOD */
  75         u16     s_pad2;
  76         sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
  77         /* locks, not used by Linux: */
  78         char    s_flock;        /* lock during free block list manipulation */
  79         char    s_ilock;        /* lock during inode cache manipulation */
  80         char    s_fmod;         /* super-block modified flag */
  81         char    s_ronly;        /* flag whether fs is mounted read-only */
  82         u32     s_time;         /* time of last super block update */
  83         s16     s_dinfo[4];     /* device information ?? */
  84         u32     s_tfree;        /* total number of free zones */
  85         u16     s_tinode;       /* total number of free inodes */
  86         u16     s_pad3;
  87         char    s_fname[6];     /* file system volume name */
  88         char    s_fpack[6];     /* file system pack name */
  89         s32     s_fill[12];
  90         s32     s_state;        /* file system state: 0x7c269d38-s_time means clean */
  91         s32     s_magic;        /* version of file system */
  92         s32     s_type;         /* type of file system: 1 for 512 byte blocks
  93                                                                 2 for 1024 byte blocks */
  94 };
  95
  96 /* SystemV2 super-block data on disk */
  97 struct sysv2_super_block {
  98         u16     s_isize;                /* index of first data zone */
  99         u32     s_fsize __packed2__;    /* total number of zones of this fs */
 100         /* the start of the free block list: */
 101         u16     s_nfree;                /* number of free blocks in s_free, <= SYSV_NICFREE */
 102         u32     s_free[SYSV_NICFREE];   /* first free block list chunk */
 103         /* the cache of free inodes: */
 104         u16     s_ninode;               /* number of free inodes in s_inode, <= SYSV_NICINOD */
 105         sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
 106         /* locks, not used by Linux: */
 107         char    s_flock;                /* lock during free block list manipulation */
 108         char    s_ilock;                /* lock during inode cache manipulation */
 109         char    s_fmod;                 /* super-block modified flag */
 110         char    s_ronly;                /* flag whether fs is mounted read-only */
 111         u32     s_time __packed2__;     /* time of last super block update */
 112         s16     s_dinfo[4];             /* device information ?? */
 113         u32     s_tfree __packed2__;    /* total number of free zones */
 114         u16     s_tinode;               /* total number of free inodes */
 115         char    s_fname[6];             /* file system volume name */
 116         char    s_fpack[6];             /* file system pack name */
 117         s32     s_fill[14];
 118         s32     s_state;                /* file system state: 0xcb096f43 means clean */
 119         s32     s_magic;                /* version of file system */
 120         s32     s_type;                 /* type of file system: 1 for 512 byte blocks
 121                                                                 2 for 1024 byte blocks */
 122 };
 123
 124 /* V7 super-block data on disk */
 125 #define V7_NICINOD     100     /* number of inode cache entries */
 126 #define V7_NICFREE     50      /* number of free block list chunk entries */
 127 struct v7_super_block {
 128         u16    s_isize;        /* index of first data zone */
 129         u32    s_fsize __packed2__; /* total number of zones of this fs */
 130         /* the start of the free block list: */
 131         u16    s_nfree;        /* number of free blocks in s_free, <= V7_NICFREE */
 132         u32    s_free[V7_NICFREE]; /* first free block list chunk */
 133         /* the cache of free inodes: */
 134         u16    s_ninode;       /* number of free inodes in s_inode, <= V7_NICINOD */
 135         sysv_ino_t      s_inode[V7_NICINOD]; /* some free inodes */
 136         /* locks, not used by Linux or V7: */
 137         char    s_flock;        /* lock during free block list manipulation */
 138         char    s_ilock;        /* lock during inode cache manipulation */
 139         char    s_fmod;         /* super-block modified flag */
 140         char    s_ronly;        /* flag whether fs is mounted read-only */
 141         u32     s_time __packed2__; /* time of last super block update */
 142         /* the following fields are not maintained by V7: */
 143         u32     s_tfree __packed2__; /* total number of free zones */
 144         u16     s_tinode;       /* total number of free inodes */
 145         u16     s_m;            /* interleave factor */
 146         u16     s_n;            /* interleave factor */
 147         char    s_fname[6];     /* file system name */
 148         char    s_fpack[6];     /* file system pack name */
 149 };
 150
 151 /* Coherent super-block data on disk */
 152 #define COH_NICINOD     100     /* number of inode cache entries */
 153 #define COH_NICFREE     64      /* number of free block list chunk entries */
 154 struct coh_super_block {
 155         u16             s_isize;        /* index of first data zone */
 156         u32             s_fsize __packed2__; /* total number of zones of this fs */
 157         /* the start of the free block list: */
 158         u16 s_nfree;    /* number of free blocks in s_free, <= COH_NICFREE */
 159         u32             s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
 160         /* the cache of free inodes: */
 161         u16             s_ninode;       /* number of free inodes in s_inode, <= COH_NICINOD */
 162         sysv_ino_t      s_inode[COH_NICINOD]; /* some free inodes */
 163         /* locks, not used by Linux: */
 164         char            s_flock;        /* lock during free block list manipulation */
 165         char            s_ilock;        /* lock during inode cache manipulation */
 166         char            s_fmod;         /* super-block modified flag */
 167         char            s_ronly;        /* flag whether fs is mounted read-only */
 168         u32             s_time __packed2__; /* time of last super block update */
 169         u32             s_tfree __packed2__; /* total number of free zones */
 170         u16             s_tinode;       /* total number of free inodes */
 171         u16             s_interleave_m; /* interleave factor */
 172         u16             s_interleave_n;
 173         char            s_fname[6];     /* file system volume name */
 174         char            s_fpack[6];     /* file system pack name */
 175         u32             s_unique;       /* zero, not used */
 176 };
 177
 178 /* SystemV/Coherent inode data on disk */
 179 struct sysv_inode {
 180         u16 i_mode;
 181         u16 i_nlink;
 182         u16 i_uid;
 183         u16 i_gid;
 184         u32 i_size;
 185         u8  i_data[3*(10+1+1+1)];
 186         u8  i_gen;
 187         u32 i_atime;    /* time of last access */
 188         u32 i_mtime;    /* time of last modification */
 189         u32 i_ctime;    /* time of creation */
 190 };
 191
 192 /* SystemV/Coherent directory entry on disk */
 193 #define SYSV_NAMELEN    14      /* max size of name in struct sysv_dir_entry */
 194 struct sysv_dir_entry {
 195         sysv_ino_t inode;
 196         char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
 197 };
 198
 199 #define SYSV_DIRSIZE    sizeof(struct sysv_dir_entry)   /* size of every directory entry */
 200
 201 #endif /* _LINUX_SYSV_FS_H */