(2006-08-06) rescue-bootcd

extra/linux-2.6.10/include/linux/prio_tree.h

@@ -0,0 +1,76 @@
+#ifndef _LINUX_PRIO_TREE_H
+#define _LINUX_PRIO_TREE_H
+
+struct prio_tree_node {
+	struct prio_tree_node	*left;
+	struct prio_tree_node	*right;
+	struct prio_tree_node	*parent;
+};
+
+struct prio_tree_root {
+	struct prio_tree_node	*prio_tree_node;
+	unsigned int 		index_bits;
+};
+
+struct prio_tree_iter {
+	struct prio_tree_node	*cur;
+	unsigned long		mask;
+	unsigned long		value;
+	int			size_level;
+
+	struct prio_tree_root	*root;
+	pgoff_t			r_index;
+	pgoff_t			h_index;
+};
+
+static inline void prio_tree_iter_init(struct prio_tree_iter *iter,
+		struct prio_tree_root *root, pgoff_t r_index, pgoff_t h_index)
+{
+	iter->root = root;
+	iter->r_index = r_index;
+	iter->h_index = h_index;
+}
+
+#define INIT_PRIO_TREE_ROOT(ptr)	\
+do {					\
+	(ptr)->prio_tree_node = NULL;	\
+	(ptr)->index_bits = 1;		\
+} while (0)
+
+#define INIT_PRIO_TREE_NODE(ptr)				\
+do {								\
+	(ptr)->left = (ptr)->right = (ptr)->parent = (ptr);	\
+} while (0)
+
+#define INIT_PRIO_TREE_ITER(ptr)	\
+do {					\
+	(ptr)->cur = NULL;		\
+	(ptr)->mask = 0UL;		\
+	(ptr)->value = 0UL;		\
+	(ptr)->size_level = 0;		\
+} while (0)
+
+#define prio_tree_entry(ptr, type, member) \
+       ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+static inline int prio_tree_empty(const struct prio_tree_root *root)
+{
+	return root->prio_tree_node == NULL;
+}
+
+static inline int prio_tree_root(const struct prio_tree_node *node)
+{
+	return node->parent == node;
+}
+
+static inline int prio_tree_left_empty(const struct prio_tree_node *node)
+{
+	return node->left == node;
+}
+
+static inline int prio_tree_right_empty(const struct prio_tree_node *node)
+{
+	return node->right == node;
+}
+
+#endif /* _LINUX_PRIO_TREE_H */