typedef DARRAY(u32) snapshot_id_list;
+#define IS_ANCESTOR_BITMAP 128
+
struct snapshot_t {
u32 parent;
u32 skip[3];
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)];
};
struct snapshot_table {