/*
* 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 */