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#ifndef _LINUX_SYSV_FS_H
#define _LINUX_SYSV_FS_H

#if defined(__GNUC__)
# define __packed2__    __attribute__((packed, aligned(2)))
#else
>> I want to scream! <<
#endif


/* inode numbers are 16 bit */
typedef u16 sysv_ino_t;

/* Block numbers are 24 bit, sometimes stored in 32 bit.
   On Coherent FS, they are always stored in PDP-11 manner: the least
   significant 16 bits come last. */

typedef u32 sysv_zone_t;

/* 0 is non-existent */
#define SYSV_BADBL_INO  1       /* inode of bad blocks file */
#define SYSV_ROOT_INO   2       /* inode of root directory */


/* Xenix super-block data on disk */
#define XENIX_NICINOD   100     /* number of inode cache entries */
#define XENIX_NICFREE   100     /* number of free block list chunk entries */
struct xenix_super_block {
        u16             s_isize; /* index of first data zone */
        u32             s_fsize __packed2__; /* total number of zones of this fs */
        /* the start of the free block list: */
        u16             s_nfree;        /* number of free blocks in s_free, <= XENIX_NICFREE */
        u32             s_free[XENIX_NICFREE]; /* first free block list chunk */
        /* the cache of free inodes: */
        u16             s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
        sysv_ino_t      s_inode[XENIX_NICINOD]; /* some free inodes */
        /* locks, not used by Linux: */
        char            s_flock;        /* lock during free block list manipulation */
        char            s_ilock;        /* lock during inode cache manipulation */
        char            s_fmod;         /* super-block modified flag */
        char            s_ronly;        /* flag whether fs is mounted read-only */
        u32             s_time __packed2__; /* time of last super block update */
        u32             s_tfree __packed2__; /* total number of free zones */
        u16             s_tinode;       /* total number of free inodes */
        s16             s_dinfo[4];     /* device information ?? */
        char            s_fname[6];     /* file system volume name */
        char            s_fpack[6];     /* file system pack name */
        char            s_clean;        /* set to 0x46 when filesystem is properly unmounted */
        char            s_fill[371];
        s32             s_magic;        /* version of file system */
        s32             s_type;         /* type of file system: 1 for 512 byte blocks
                                                                2 for 1024 byte blocks
                                                                3 for 2048 byte blocks */

                                                               
};

/*
 * SystemV FS comes in two variants:
 * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
 * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
 */

#define SYSV_NICINOD    100     /* number of inode cache entries */
#define SYSV_NICFREE    50      /* number of free block list chunk entries */

/* SystemV4 super-block data on disk */
struct sysv4_super_block {
        u16     s_isize;        /* index of first data zone */
        u16     s_pad0;
        u32     s_fsize;        /* total number of zones of this fs */
        /* the start of the free block list: */
        u16     s_nfree;        /* number of free blocks in s_free, <= SYSV_NICFREE */
        u16     s_pad1;
        u32     s_free[SYSV_NICFREE]; /* first free block list chunk */
        /* the cache of free inodes: */
        u16     s_ninode;       /* number of free inodes in s_inode, <= SYSV_NICINOD */
        u16     s_pad2;
        sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
        /* locks, not used by Linux: */
        char    s_flock;        /* lock during free block list manipulation */
        char    s_ilock;        /* lock during inode cache manipulation */
        char    s_fmod;         /* super-block modified flag */
        char    s_ronly;        /* flag whether fs is mounted read-only */
        u32     s_time;         /* time of last super block update */
        s16     s_dinfo[4];     /* device information ?? */
        u32     s_tfree;        /* total number of free zones */
        u16     s_tinode;       /* total number of free inodes */
        u16     s_pad3;
        char    s_fname[6];     /* file system volume name */
        char    s_fpack[6];     /* file system pack name */
        s32     s_fill[12];
        s32     s_state;        /* file system state: 0x7c269d38-s_time means clean */
        s32     s_magic;        /* version of file system */
        s32     s_type;         /* type of file system: 1 for 512 byte blocks
                                                                2 for 1024 byte blocks */

};

/* SystemV2 super-block data on disk */
struct sysv2_super_block {
        u16     s_isize;                /* index of first data zone */
        u32     s_fsize __packed2__;    /* total number of zones of this fs */
        /* the start of the free block list: */
        u16     s_nfree;                /* number of free blocks in s_free, <= SYSV_NICFREE */
        u32     s_free[SYSV_NICFREE];   /* first free block list chunk */
        /* the cache of free inodes: */
        u16     s_ninode;               /* number of free inodes in s_inode, <= SYSV_NICINOD */
        sysv_ino_t     s_inode[SYSV_NICINOD]; /* some free inodes */
        /* locks, not used by Linux: */
        char    s_flock;                /* lock during free block list manipulation */
        char    s_ilock;                /* lock during inode cache manipulation */
        char    s_fmod;                 /* super-block modified flag */
        char    s_ronly;                /* flag whether fs is mounted read-only */
        u32     s_time __packed2__;     /* time of last super block update */
        s16     s_dinfo[4];             /* device information ?? */
        u32     s_tfree __packed2__;    /* total number of free zones */
        u16     s_tinode;               /* total number of free inodes */
        char    s_fname[6];             /* file system volume name */
        char    s_fpack[6];             /* file system pack name */
        s32     s_fill[14];
        s32     s_state;                /* file system state: 0xcb096f43 means clean */
        s32     s_magic;                /* version of file system */
        s32     s_type;                 /* type of file system: 1 for 512 byte blocks
                                                                2 for 1024 byte blocks */

};

/* V7 super-block data on disk */
#define V7_NICINOD     100     /* number of inode cache entries */
#define V7_NICFREE     50      /* number of free block list chunk entries */
struct v7_super_block {
        u16    s_isize;        /* index of first data zone */
        u32    s_fsize __packed2__; /* total number of zones of this fs */
        /* the start of the free block list: */
        u16    s_nfree;        /* number of free blocks in s_free, <= V7_NICFREE */
        u32    s_free[V7_NICFREE]; /* first free block list chunk */
        /* the cache of free inodes: */
        u16    s_ninode;       /* number of free inodes in s_inode, <= V7_NICINOD */
        sysv_ino_t      s_inode[V7_NICINOD]; /* some free inodes */
        /* locks, not used by Linux or V7: */
        char    s_flock;        /* lock during free block list manipulation */
        char    s_ilock;        /* lock during inode cache manipulation */
        char    s_fmod;         /* super-block modified flag */
        char    s_ronly;        /* flag whether fs is mounted read-only */
        u32     s_time __packed2__; /* time of last super block update */
        /* the following fields are not maintained by V7: */
        u32     s_tfree __packed2__; /* total number of free zones */
        u16     s_tinode;       /* total number of free inodes */
        u16     s_m;            /* interleave factor */
        u16     s_n;            /* interleave factor */
        char    s_fname[6];     /* file system name */
        char    s_fpack[6];     /* file system pack name */
};

/* Coherent super-block data on disk */
#define COH_NICINOD     100     /* number of inode cache entries */
#define COH_NICFREE     64      /* number of free block list chunk entries */
struct coh_super_block {
        u16             s_isize;        /* index of first data zone */
        u32             s_fsize __packed2__; /* total number of zones of this fs */
        /* the start of the free block list: */
        u16 s_nfree;    /* number of free blocks in s_free, <= COH_NICFREE */
        u32             s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
        /* the cache of free inodes: */
        u16             s_ninode;       /* number of free inodes in s_inode, <= COH_NICINOD */
        sysv_ino_t      s_inode[COH_NICINOD]; /* some free inodes */
        /* locks, not used by Linux: */
        char            s_flock;        /* lock during free block list manipulation */
        char            s_ilock;        /* lock during inode cache manipulation */
        char            s_fmod;         /* super-block modified flag */
        char            s_ronly;        /* flag whether fs is mounted read-only */
        u32             s_time __packed2__; /* time of last super block update */
        u32             s_tfree __packed2__; /* total number of free zones */
        u16             s_tinode;       /* total number of free inodes */
        u16             s_interleave_m; /* interleave factor */
        u16             s_interleave_n;
        char            s_fname[6];     /* file system volume name */
        char            s_fpack[6];     /* file system pack name */
        u32             s_unique;       /* zero, not used */
};

/* SystemV/Coherent inode data on disk */
struct sysv_inode {
        u16 i_mode;
        u16 i_nlink;
        u16 i_uid;
        u16 i_gid;
        u32 i_size;
        u8  i_data[3*(10+1+1+1)];
        u8  i_gen;
        u32 i_atime;    /* time of last access */
        u32 i_mtime;    /* time of last modification */
        u32 i_ctime;    /* time of creation */
};

/* SystemV/Coherent directory entry on disk */
#define SYSV_NAMELEN    14      /* max size of name in struct sysv_dir_entry */
struct sysv_dir_entry {
        sysv_ino_t inode;
        char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
};

#define SYSV_DIRSIZE    sizeof(struct sysv_dir_entry)   /* size of every directory entry */

#endif /* _LINUX_SYSV_FS_H */