bfs_fs.h
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上传日期:2013-02-24
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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
- #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 */