Update

src/filesys/free-map.h

+#ifndef FILESYS_FREE_MAP_H
+#define FILESYS_FREE_MAP_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include "devices/block.h"
+
+void free_map_init (void);
+void free_map_read (void);
+void free_map_create (void);
+void free_map_open (void);
+void free_map_close (void);
+
+bool free_map_allocate (size_t, block_sector_t *);
+void free_map_release (block_sector_t, size_t);
+
+#endif /* filesys/free-map.h */