uapi/linux/bfs_fs.h

0001 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
0002 /*
0003  *  include/linux/bfs_fs.h - BFS data structures on disk.
0004  *  Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>
0005  */
0006
0007 #ifndef _LINUX_BFS_FS_H
0008 #define _LINUX_BFS_FS_H
0009
0010 #include <linux/types.h>
0011
0012 #define BFS_BSIZE_BITS      9
0013 #define BFS_BSIZE       (1<<BFS_BSIZE_BITS)
0014
0015 #define BFS_MAGIC       0x1BADFACE
0016 #define BFS_ROOT_INO        2
0017 #define BFS_INODES_PER_BLOCK    8
0018
0019 /* SVR4 vnode type values (bfs_inode->i_vtype) */
0020 #define BFS_VDIR 2L
0021 #define BFS_VREG 1L
0022
0023 /* BFS inode layout on disk */
0024 struct bfs_inode {
0025     __le16 i_ino;
0026     __u16 i_unused;
0027     __le32 i_sblock;
0028     __le32 i_eblock;
0029     __le32 i_eoffset;
0030     __le32 i_vtype;
0031     __le32 i_mode;
0032     __le32 i_uid;
0033     __le32 i_gid;
0034     __le32 i_nlink;
0035     __le32 i_atime;
0036     __le32 i_mtime;
0037     __le32 i_ctime;
0038     __u32 i_padding[4];
0039 };
0040
0041 #define BFS_NAMELEN     14
0042 #define BFS_DIRENT_SIZE     16
0043 #define BFS_DIRS_PER_BLOCK  32
0044
0045 struct bfs_dirent {
0046     __le16 ino;
0047     char name[BFS_NAMELEN];
0048 };
0049
0050 /* BFS superblock layout on disk */
0051 struct bfs_super_block {
0052     __le32 s_magic;
0053     __le32 s_start;
0054     __le32 s_end;
0055     __le32 s_from;
0056     __le32 s_to;
0057     __s32 s_bfrom;
0058     __s32 s_bto;
0059     char  s_fsname[6];
0060     char  s_volume[6];
0061     __u32 s_padding[118];
0062 };
0063
0064
0065 #define BFS_OFF2INO(offset) \
0066         ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
0067
0068 #define BFS_INO2OFF(ino) \
0069     ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
0070 #define BFS_NZFILESIZE(ip) \
0071         ((le32_to_cpu((ip)->i_eoffset) + 1) -  le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
0072
0073 #define BFS_FILESIZE(ip) \
0074         ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
0075
0076 #define BFS_FILEBLOCKS(ip) \
0077         ((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) -  le32_to_cpu((ip)->i_sblock))
0078 #define BFS_UNCLEAN(bfs_sb, sb) \
0079     ((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & SB_RDONLY))
0080
0081
0082 #endif  /* _LINUX_BFS_FS_H */