+#include <linux/darray_types.h>
+
+typedef DARRAY(u32) snapshot_id_list;
+
+#define IS_ANCESTOR_BITMAP 128
+
+struct snapshot_t {
+ u32 parent;
+ u32 skip[3];
+ u32 depth;
+ u32 children[2];
+ u32 subvol; /* Nonzero only if a subvolume points to this node: */
+ u32 tree;
+ u32 equiv;
+ unsigned long is_ancestor[BITS_TO_LONGS(IS_ANCESTOR_BITMAP)];