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_H 8 #define _LINUX_BFS_FS_H 9 10 #include <linux/types.h> 11 12 #define BFS_BSIZE_BITS 9 13 #define BFS_BSIZE (1<<BFS_BSIZE_BITS) 14 15 #define BFS_MAGIC 0x1BADFACE 16 #define BFS_ROOT_INO 2 17 #define BFS_INODES_PER_BLOCK 8 18 19 /* SVR4 vnode type values (bfs_inode->i_vtype) */ 20 #define BFS_VDIR 2L 21 #define BFS_VREG 1L 22 23 /* BFS inode layout on disk */ 24 struct 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 16 43 #define BFS_DIRS_PER_BLOCK 32 44 45 struct bfs_dirent { 46 __le16 ino; 47 char name[BFS_NAMELEN]; 48 }; 49 50 /* BFS superblock layout on disk */ 51 struct 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