83 lines · c
1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2/*3 * include/linux/bfs_fs.h - BFS data structures on disk.4 * Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>5 */6 7#ifndef _LINUX_BFS_FS_H8#define _LINUX_BFS_FS_H9 10#include <linux/types.h>11 12#define BFS_BSIZE_BITS 913#define BFS_BSIZE (1<<BFS_BSIZE_BITS)14 15#define BFS_MAGIC 0x1BADFACE16#define BFS_ROOT_INO 217#define BFS_INODES_PER_BLOCK 818 19/* SVR4 vnode type values (bfs_inode->i_vtype) */20#define BFS_VDIR 2L21#define BFS_VREG 1L22 23/* BFS inode layout on disk */24struct bfs_inode {25 __le16 i_ino;26 __u16 i_unused;27 __le32 i_sblock;28 __le32 i_eblock;29 __le32 i_eoffset;30 __le32 i_vtype;31 __le32 i_mode;32 __le32 i_uid;33 __le32 i_gid;34 __le32 i_nlink;35 __le32 i_atime;36 __le32 i_mtime;37 __le32 i_ctime;38 __u32 i_padding[4];39};40 41#define BFS_NAMELEN 14 42#define BFS_DIRENT_SIZE 1643#define BFS_DIRS_PER_BLOCK 3244 45struct bfs_dirent {46 __le16 ino;47 char name[BFS_NAMELEN];48};49 50/* BFS superblock layout on disk */51struct bfs_super_block {52 __le32 s_magic;53 __le32 s_start;54 __le32 s_end;55 __le32 s_from;56 __le32 s_to;57 __s32 s_bfrom;58 __s32 s_bto;59 char s_fsname[6];60 char s_volume[6];61 __u32 s_padding[118];62};63 64 65#define BFS_OFF2INO(offset) \66 ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)67 68#define BFS_INO2OFF(ino) \69 ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)70#define BFS_NZFILESIZE(ip) \71 ((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)72 73#define BFS_FILESIZE(ip) \74 ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))75 76#define BFS_FILEBLOCKS(ip) \77 ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock))78#define BFS_UNCLEAN(bfs_sb, sb) \79 ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & SB_RDONLY))80 81 82#endif /* _LINUX_BFS_FS_H */83