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#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 */
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