include/linux/sysv_fs.h

   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 */