1 /* 2 * include/linux/bfs_fs.h - BFS data structures on disk. 3 * Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com> 4 */ 5 6 #ifndef _LINUX_BFS_FS_H 7 #define _LINUX_BFS_FS_H 8 9 #include <linux/types.h> 10 11 #define BFS_BSIZE_BITS 9 12 #define BFS_BSIZE (1<<BFS_BSIZE_BITS) 13 14 #define BFS_MAGIC 0x1BADFACE 15 #define BFS_ROOT_INO 2 16 #define BFS_INODES_PER_BLOCK 8 17 18 /* SVR4 vnode type values (bfs_inode->i_vtype) */ 19 #define BFS_VDIR 2L 20 #define BFS_VREG 1L 21 22 /* BFS inode layout on disk */ 23 struct bfs_inode { 24 __le16 i_ino; 25 __u16 i_unused; 26 __le32 i_sblock; 27 __le32 i_eblock; 28 __le32 i_eoffset; 29 __le32 i_vtype; 30 __le32 i_mode; 31 __le32 i_uid; 32 __le32 i_gid; 33 __le32 i_nlink; 34 __le32 i_atime; 35 __le32 i_mtime; 36 __le32 i_ctime; 37 __u32 i_padding[4]; 38 }; 39 40 #define BFS_NAMELEN 14 41 #define BFS_DIRENT_SIZE 16 42 #define BFS_DIRS_PER_BLOCK 32 43 44 struct bfs_dirent { 45 __le16 ino; 46 char name[BFS_NAMELEN]; 47 }; 48 49 /* BFS superblock layout on disk */ 50 struct bfs_super_block { 51 __le32 s_magic; 52 __le32 s_start; 53 __le32 s_end; 54 __le32 s_from; 55 __le32 s_to; 56 __s32 s_bfrom; 57 __s32 s_bto; 58 char s_fsname[6]; 59 char s_volume[6]; 60 __u32 s_padding[118]; 61 }; 62 63 64 #define BFS_OFF2INO(offset) \ 65 ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO) 66 67 #define BFS_INO2OFF(ino) \ 68 ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE) 69 #define BFS_NZFILESIZE(ip) \ 70 ((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE) 71 72 #define BFS_FILESIZE(ip) \ 73 ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip)) 74 75 #define BFS_FILEBLOCKS(ip) \ 76 ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock)) 77 #define BFS_UNCLEAN(bfs_sb, sb) \ 78 ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & MS_RDONLY)) 79 80 81 #endif /* _LINUX_BFS_FS_H */ 82