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/*
* include/linux/bfs_fs.h - BFS data structures on disk.
* Copyright (C) 1999 Tigran Aivazian <tigran@ocston.org>
*/
#ifndef _LINUX_BFS_FS_H
#define _LINUX_BFS_FS_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 2
#define BFS_VREG 1
/* BFS inode layout on disk */
struct bfs_inode {
__u16 i_ino;
__u16 i_unused;
__u32 i_sblock;
__u32 i_eblock;
__u32 i_eoffset;
__u32 i_vtype;
__u32 i_mode;
__s32 i_uid;
__s32 i_gid;
__u32 i_nlink;
__u32 i_atime;
__u32 i_mtime;
__u32 i_ctime;
__u32 i_padding[4];
};
#define BFS_NAMELEN 14
#define BFS_DIRENT_SIZE 16
#define BFS_DIRS_PER_BLOCK 32
struct bfs_dirent {
__u16 ino;
char name[BFS_NAMELEN];
};
/* BFS superblock layout on disk */
struct bfs_super_block {
__u32 s_magic;
__u32 s_start;
__u32 s_end;
__s32 s_from;
__s32 s_to;
__s32 s_bfrom;
__s32 s_bto;
char s_fsname[6];
char s_volume[6];
__u32 s_padding[118];
};
#define BFS_NZFILESIZE(ip) \
(((ip)->i_eoffset + 1) - (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 : ((ip)->i_eblock + 1) - (ip)->i_sblock)
#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_UNCLEAN(bfs_sb, sb) \
((bfs_sb->s_from != -1) && (bfs_sb->s_to != -1) && !(sb->s_flags & MS_RDONLY))
#ifdef __KERNEL__
/* file.c */
extern struct inode_operations bfs_file_inops;
extern struct file_operations bfs_file_operations;
extern struct address_space_operations bfs_aops;
/* dir.c */
extern struct inode_operations bfs_dir_inops;
extern struct file_operations bfs_dir_operations;
#endif /* __KERNEL__ */
#endif /* _LINUX_BFS_FS_H */
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