summaryrefslogtreecommitdiff
path: root/rbtree.h
diff options
context:
space:
mode:
Diffstat (limited to 'rbtree.h')
-rw-r--r--rbtree.h22
1 files changed, 18 insertions, 4 deletions
diff --git a/rbtree.h b/rbtree.h
index e722b1e..4c06d98 100644
--- a/rbtree.h
+++ b/rbtree.h
@@ -98,8 +98,7 @@ static inline struct page * rb_insert_page_cache(struct inode * inode,
struct rb_node
{
- struct rb_node *rb_parent;
- int rb_color;
+ unsigned long rb_parent_color;
#define RB_RED 0
#define RB_BLACK 1
struct rb_node *rb_right;
@@ -122,6 +121,22 @@ struct rb_root
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
+#define rb_parent(r) ((struct rb_node *)((r)->rb_parent_color & ~3))
+#define rb_color(r) ((r)->rb_parent_color & 1)
+#define rb_is_red(r) (!rb_color(r))
+#define rb_is_black(r) rb_color(r)
+#define rb_set_red(r) do { (r)->rb_parent_color &= ~1; } while (0)
+#define rb_set_black(r) do { (r)->rb_parent_color |= 1; } while (0)
+
+static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
+{
+ rb->rb_parent_color = (rb->rb_parent_color & 3) | (unsigned long)p;
+}
+static inline void rb_set_color(struct rb_node *rb, int color)
+{
+ rb->rb_parent_color = (rb->rb_parent_color & ~1) | color;
+}
+
#define RB_ROOT (struct rb_root) { NULL, }
#define rb_entry(ptr, type, member) container_of(ptr, type, member)
@@ -141,8 +156,7 @@ extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
struct rb_node ** rb_link)
{
- node->rb_parent = parent;
- node->rb_color = RB_RED;
+ node->rb_parent_color = (unsigned long )parent;
node->rb_left = node->rb_right = NULL;
*rb_link = node;