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