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83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
4 years ago
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* include/linux/bfs_fs.h - BFS data structures on disk.
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* Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>
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*/
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#ifndef _LINUX_BFS_FS_H
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#define _LINUX_BFS_FS_H
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#include <linux/types.h>
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#define BFS_BSIZE_BITS 9
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#define BFS_BSIZE (1<<BFS_BSIZE_BITS)
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#define BFS_MAGIC 0x1BADFACE
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#define BFS_ROOT_INO 2
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#define BFS_INODES_PER_BLOCK 8
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/* SVR4 vnode type values (bfs_inode->i_vtype) */
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#define BFS_VDIR 2L
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#define BFS_VREG 1L
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/* BFS inode layout on disk */
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struct bfs_inode {
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__le16 i_ino;
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__u16 i_unused;
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__le32 i_sblock;
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__le32 i_eblock;
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__le32 i_eoffset;
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__le32 i_vtype;
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__le32 i_mode;
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__le32 i_uid;
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__le32 i_gid;
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__le32 i_nlink;
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__le32 i_atime;
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__le32 i_mtime;
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__le32 i_ctime;
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__u32 i_padding[4];
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};
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#define BFS_NAMELEN 14
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#define BFS_DIRENT_SIZE 16
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#define BFS_DIRS_PER_BLOCK 32
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struct bfs_dirent {
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__le16 ino;
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char name[BFS_NAMELEN];
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};
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/* BFS superblock layout on disk */
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struct bfs_super_block {
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__le32 s_magic;
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__le32 s_start;
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__le32 s_end;
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__le32 s_from;
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__le32 s_to;
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__s32 s_bfrom;
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__s32 s_bto;
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char s_fsname[6];
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char s_volume[6];
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__u32 s_padding[118];
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};
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#define BFS_OFF2INO(offset) \
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((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
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#define BFS_INO2OFF(ino) \
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((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
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#define BFS_NZFILESIZE(ip) \
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((le32_to_cpu((ip)->i_eoffset) + 1) - le32_to_cpu((ip)->i_sblock) * BFS_BSIZE)
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#define BFS_FILESIZE(ip) \
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((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
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#define BFS_FILEBLOCKS(ip) \
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((ip)->i_sblock == 0 ? 0 : (le32_to_cpu((ip)->i_eblock) + 1) - le32_to_cpu((ip)->i_sblock))
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#define BFS_UNCLEAN(bfs_sb, sb) \
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((le32_to_cpu(bfs_sb->s_from) != -1) && (le32_to_cpu(bfs_sb->s_to) != -1) && !(sb->s_flags & SB_RDONLY))
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#endif /* _LINUX_BFS_FS_H */
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