summaryrefslogtreecommitdiffstats
path: root/include/linux/bfs_fs.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/bfs_fs.h')
-rw-r--r--include/linux/bfs_fs.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/include/linux/bfs_fs.h b/include/linux/bfs_fs.h
new file mode 100644
index 00000000000..f7f0913cd11
--- /dev/null
+++ b/include/linux/bfs_fs.h
@@ -0,0 +1,79 @@
+/*
+ * include/linux/bfs_fs.h - BFS data structures on disk.
+ * Copyright (C) 1999 Tigran Aivazian <tigran@veritas.com>
+ */
+
+#ifndef _LINUX_BFS_FS_H
+#define _LINUX_BFS_FS_H
+
+#define BFS_BSIZE_BITS 9
+#define BFS_BSIZE (1<<BFS_BSIZE_BITS)
+
+#define BFS_MAGIC 0x1BADFACE
+#define BFS_ROOT_INO 2
+#define BFS_INODES_PER_BLOCK 8
+
+/* SVR4 vnode type values (bfs_inode->i_vtype) */
+#define BFS_VDIR 2
+#define BFS_VREG 1
+
+/* BFS inode layout on disk */
+struct bfs_inode {
+ __u16 i_ino;
+ __u16 i_unused;
+ __u32 i_sblock;
+ __u32 i_eblock;
+ __u32 i_eoffset;
+ __u32 i_vtype;
+ __u32 i_mode;
+ __s32 i_uid;
+ __s32 i_gid;
+ __u32 i_nlink;
+ __u32 i_atime;
+ __u32 i_mtime;
+ __u32 i_ctime;
+ __u32 i_padding[4];
+};
+
+#define BFS_NAMELEN 14
+#define BFS_DIRENT_SIZE 16
+#define BFS_DIRS_PER_BLOCK 32
+
+struct bfs_dirent {
+ __u16 ino;
+ char name[BFS_NAMELEN];
+};
+
+/* BFS superblock layout on disk */
+struct bfs_super_block {
+ __u32 s_magic;
+ __u32 s_start;
+ __u32 s_end;
+ __s32 s_from;
+ __s32 s_to;
+ __s32 s_bfrom;
+ __s32 s_bto;
+ char s_fsname[6];
+ char s_volume[6];
+ __u32 s_padding[118];
+};
+
+#define BFS_NZFILESIZE(ip) \
+ (((ip)->i_eoffset + 1) - (ip)->i_sblock * BFS_BSIZE)
+
+#define BFS_FILESIZE(ip) \
+ ((ip)->i_sblock == 0 ? 0 : BFS_NZFILESIZE(ip))
+
+#define BFS_FILEBLOCKS(ip) \
+ ((ip)->i_sblock == 0 ? 0 : ((ip)->i_eblock + 1) - (ip)->i_sblock)
+
+#define BFS_OFF2INO(offset) \
+ ((((offset) - BFS_BSIZE) / sizeof(struct bfs_inode)) + BFS_ROOT_INO)
+
+#define BFS_INO2OFF(ino) \
+ ((__u32)(((ino) - BFS_ROOT_INO) * sizeof(struct bfs_inode)) + BFS_BSIZE)
+
+#define BFS_UNCLEAN(bfs_sb, sb) \
+ ((bfs_sb->s_from != -1) && (bfs_sb->s_to != -1) && !(sb->s_flags & MS_RDONLY))
+
+#endif /* _LINUX_BFS_FS_H */