bfs_fs.h

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/*
 *  include/linux/bfs_fs.h - BFS data structures on disk.
 *  Copyright (C) 1999 Tigran Aivazian <[email protected]>
 */

#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 */