Add original unix v6

sys/filsys.h

@@ -0,0 +1,26 @@
+/*
+ * Definition of the unix super block.
+ * The root super block is allocated and
+ * read in iinit/alloc.c. Subsequently
+ * a super block is allocated and read
+ * with each mount (smount/sys3.c) and
+ * released with unmount (sumount/sys3.c).
+ * A disk block is ripped off for storage.
+ * See alloc.c for general alloc/free
+ * routines for free list and I list.
+ */
+struct	filsys
+{
+	int	s_isize;	/* size in blocks of I list */
+	int	s_fsize;	/* size in blocks of entire volume */
+	int	s_nfree;	/* number of in core free blocks (0-100) */
+	int	s_free[100];	/* in core free blocks */
+	int	s_ninode;	/* number of in core I nodes (0-100) */
+	int	s_inode[100];	/* in core free I nodes */
+	char	s_flock;	/* lock during free list manipulation */
+	char	s_ilock;	/* lock during I list manipulation */
+	char	s_fmod;		/* super block modified flag */
+	char	s_ronly;	/* mounted read-only flag */
+	int	s_time[2];	/* current date of last update */
+	int	pad[50];
+};