16f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2607ca46eSDavid Howells /* 3607ca46eSDavid Howells * include/linux/bfs_fs.h - BFS data structures on disk. 4*d1877155STigran Aivazian * Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com> 5607ca46eSDavid Howells */ 6607ca46eSDavid Howells 7607ca46eSDavid Howells #ifndef _LINUX_BFS_FS_H 8607ca46eSDavid Howells #define _LINUX_BFS_FS_H 9607ca46eSDavid Howells 10607ca46eSDavid Howells #include <linux/types.h> 11607ca46eSDavid Howells 12607ca46eSDavid Howells #define BFS_BSIZE_BITS 9 13607ca46eSDavid Howells #define BFS_BSIZE (1<<BFS_BSIZE_BITS) 14607ca46eSDavid Howells 15607ca46eSDavid Howells #define BFS_MAGIC 0x1BADFACE 16607ca46eSDavid Howells #define BFS_ROOT_INO 2 17607ca46eSDavid Howells #define BFS_INODES_PER_BLOCK 8 18607ca46eSDavid Howells 19607ca46eSDavid Howells /* SVR4 vnode type values (bfs_inode->i_vtype) */ 20607ca46eSDavid Howells #define BFS_VDIR 2L 21607ca46eSDavid Howells #define BFS_VREG 1L 22607ca46eSDavid Howells 23607ca46eSDavid Howells /* BFS inode layout on disk */ 24607ca46eSDavid Howells struct bfs_inode { 25607ca46eSDavid Howells __le16 i_ino; 26607ca46eSDavid Howells __u16 i_unused; 27607ca46eSDavid Howells __le32 i_sblock; 28607ca46eSDavid Howells __le32 i_eblock; 29607ca46eSDavid Howells __le32 i_eoffset; 30607ca46eSDavid Howells __le32 i_vtype; 31607ca46eSDavid Howells __le32 i_mode; 32607ca46eSDavid Howells __le32 i_uid; 33607ca46eSDavid Howells __le32 i_gid; 34607ca46eSDavid Howells __le32 i_nlink; 35607ca46eSDavid Howells __le32 i_atime; 36607ca46eSDavid Howells __le32 i_mtime; 37607ca46eSDavid Howells __le32 i_ctime; 38607ca46eSDavid Howells __u32 i_padding[4]; 39607ca46eSDavid Howells }; 40607ca46eSDavid Howells 41607ca46eSDavid Howells #define BFS_NAMELEN 14 42607ca46eSDavid Howells #define BFS_DIRENT_SIZE 16 43607ca46eSDavid Howells #define BFS_DIRS_PER_BLOCK 32 44607ca46eSDavid Howells 45607ca46eSDavid Howells struct bfs_dirent { 46607ca46eSDavid Howells __le16 ino; 47607ca46eSDavid Howells char name[BFS_NAMELEN]; 48607ca46eSDavid Howells }; 49607ca46eSDavid Howells 50607ca46eSDavid Howells /* BFS superblock layout on disk */ 51607ca46eSDavid Howells struct bfs_super_block { 52607ca46eSDavid Howells __le32 s_magic; 53607ca46eSDavid Howells __le32 s_start; 54607ca46eSDavid Howells __le32 s_end; 55607ca46eSDavid Howells __le32 s_from; 56607ca46eSDavid Howells __le32 s_to; 57607ca46eSDavid Howells __s32 s_bfrom; 58607ca46eSDavid Howells __s32 s_bto; 59607ca46eSDavid Howells char s_fsname[6]; 60607ca46eSDavid Howells char s_volume[6]; 61607ca46eSDavid Howells __u32 s_padding[118]; 62607ca46eSDavid Howells }; 63607ca46eSDavid Howells 64607ca46eSDavid Howells 65607ca46eSDavid Howells #define BFS_OFF2INO(offset) \ 66607ca46eSDavid Howells ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO) 67607ca46eSDavid Howells 68607ca46eSDavid Howells #define BFS_INO2OFF(ino) \ 69607ca46eSDavid Howells ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE) 70607ca46eSDavid Howells #define BFS_NZFILESIZE(ip) \ 71607ca46eSDavid Howells ((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE) 72607ca46eSDavid Howells 73607ca46eSDavid Howells #define BFS_FILESIZE(ip) \ 74607ca46eSDavid Howells ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip)) 75607ca46eSDavid Howells 76607ca46eSDavid Howells #define BFS_FILEBLOCKS(ip) \ 77607ca46eSDavid Howells ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock)) 78607ca46eSDavid Howells #define BFS_UNCLEAN(bfs_sb, sb) \ 791751e8a6SLinus Torvalds ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & SB_RDONLY)) 80607ca46eSDavid Howells 81607ca46eSDavid Howells 82607ca46eSDavid Howells #endif /* _LINUX_BFS_FS_H */ 83