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/*

 *      include/linux/bfs_fs.h - BFS data structures on disk.

 *      Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>

 */

#ifndef _LINUX_BFS_FS_H

#define _LINUX_BFS_FS_H

#include <linux/types.h>

#define BFS_BSIZE_BITS          9

#define BFS_BSIZE               (1<<BFS_BSIZE_BITS)

#define BFS_MAGIC               0x1BADFACE

#define BFS_ROOT_INO            2

#define BFS_INODES_PER_BLOCK    8

/* SVR4 vnode type values (bfs_inode->i_vtype) */

#define BFS_VDIR 2L

#define BFS_VREG 1L

/* BFS inode layout on disk */

struct bfs_inode {

        __le16 i_ino;

        __u16 i_unused;

        __le32 i_sblock;

        __le32 i_eblock;

        __le32 i_eoffset;

        __le32 i_vtype;

        __le32 i_mode;

        __le32 i_uid;

        __le32 i_gid;

        __le32 i_nlink;

        __le32 i_atime;

        __le32 i_mtime;

        __le32 i_ctime;

        __u32 i_padding[4];

};

#define BFS_NAMELEN             14      

#define BFS_DIRENT_SIZE         16

#define BFS_DIRS_PER_BLOCK      32

struct bfs_dirent {

        __le16 ino;

        char name[BFS_NAMELEN];

};

/* BFS superblock layout on disk */

struct bfs_super_block {

        __le32 s_magic;

        __le32 s_start;

        __le32 s_end;

        __le32 s_from;

        __le32 s_to;

        __s32 s_bfrom;

        __s32 s_bto;

        char  s_fsname[6];

        char  s_volume[6];

        __u32 s_padding[118];

};

#define BFS_OFF2INO(offset) \

        ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)

#define BFS_INO2OFF(ino) \

        ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)

#define BFS_NZFILESIZE(ip) \

        ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)

#define BFS_FILESIZE(ip) \

        ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))

#define BFS_FILEBLOCKS(ip) \

        ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))

#define BFS_UNCLEAN(bfs_sb, sb) \

        ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY))

#endif  /* _LINUX_BFS_FS_H */