--- /dev/null
+/*
+ Red Black Trees
+ (C) 1999 Andrea Arcangeli <andrea@suse.de>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ linux/include/linux/rbtree.h
+
+ To use rbtrees you'll have to implement your own insert and search cores.
+ This will avoid us to use callbacks and to drop drammatically performances.
+ I know it's not the cleaner way, but in C (not in C++) to get
+ performances and genericity...
+
+ Some example of insert and search follows here. The search is a plain
+ normal search over an ordered tree. The insert instead must be implemented
+ int two steps: as first thing the code must insert the element in
+ order as a red leaf in the tree, then the support library function
+ rb_insert_color() must be called. Such function will do the
+ not trivial work to rebalance the rbtree if necessary.
+
+-----------------------------------------------------------------------
+static inline struct page * rb_search_page_cache(struct inode * inode,
+ unsigned long offset)
+{
+ struct rb_node * n = inode->i_rb_page_cache.rb_node;
+ struct page * page;
+
+ while (n)
+ {
+ page = rb_entry(n, struct page, rb_page_cache);
+
+ if (offset < page->offset)
+ n = n->rb_left;
+ else if (offset > page->offset)
+ n = n->rb_right;
+ else
+ return page;
+ }
+ return NULL;
+}
+
+static inline struct page * __rb_insert_page_cache(struct inode * inode,
+ unsigned long offset,
+ struct rb_node * node)
+{
+ struct rb_node ** p = &inode->i_rb_page_cache.rb_node;
+ struct rb_node * parent = NULL;
+ struct page * page;
+
+ while (*p)
+ {
+ parent = *p;
+ page = rb_entry(parent, struct page, rb_page_cache);
+
+ if (offset < page->offset)
+ p = &(*p)->rb_left;
+ else if (offset > page->offset)
+ p = &(*p)->rb_right;
+ else
+ return page;
+ }
+
+ rb_link_node(node, parent, p);
+
+ return NULL;
+}
+
+static inline struct page * rb_insert_page_cache(struct inode * inode,
+ unsigned long offset,
+ struct rb_node * node)
+{
+ struct page * ret;
+ if ((ret = __rb_insert_page_cache(inode, offset, node)))
+ goto out;
+ rb_insert_color(node, &inode->i_rb_page_cache);
+ out:
+ return ret;
+}
+-----------------------------------------------------------------------
+*/
+
+#ifndef _LINUX_RBTREE_H
+#define _LINUX_RBTREE_H
+
+/*
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+*/
+
+struct rb_node
+{
+ struct rb_node *rb_parent;
+ int rb_color;
+#define RB_RED 0
+#define RB_BLACK 1
+ struct rb_node *rb_right;
+ struct rb_node *rb_left;
+};
+
+struct rb_root
+{
+ struct rb_node *rb_node;
+};
+
+// Copy from linux kernel 2.6 source (kernel.h, stddef.h)
+#define container_of(ptr, type, member) ({ \
+ const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+ (type *)( (char *)__mptr - offsetof(type,member) );})
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+
+
+#define RB_ROOT (struct rb_root) { NULL, }
+#define rb_entry(ptr, type, member) container_of(ptr, type, member)
+
+extern void rb_insert_color(struct rb_node *, struct rb_root *);
+extern void rb_erase(struct rb_node *, struct rb_root *);
+
+/* Find logical next and previous nodes in a tree */
+extern struct rb_node *rb_next(struct rb_node *);
+extern struct rb_node *rb_prev(struct rb_node *);
+extern struct rb_node *rb_first(struct rb_root *);
+extern struct rb_node *rb_last(struct rb_root *);
+
+/* Fast replacement of a single node without remove/rebalance/add/rebalance */
+extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
+ struct rb_root *root);
+
+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_left = node->rb_right = NULL;
+
+ *rb_link = node;
+}
+
+#endif /* _LINUX_RBTREE_H */
--- /dev/null
+/*
+ Red Black Trees
+ (C) 1999 Andrea Arcangeli <andrea@suse.de>
+ (C) 2002 David Woodhouse <dwmw2@infradead.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ linux/lib/rbtree.c
+*/
+
+/*
+#include <linux/rbtree.h>
+#include <linux/module.h>
+*/
+
+#include <stdlib.h>
+#include <common/rbtree.h>
+
+static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *right = node->rb_right;
+
+ if ((node->rb_right = right->rb_left))
+ right->rb_left->rb_parent = node;
+ right->rb_left = node;
+
+ if ((right->rb_parent = node->rb_parent))
+ {
+ if (node == node->rb_parent->rb_left)
+ node->rb_parent->rb_left = right;
+ else
+ node->rb_parent->rb_right = right;
+ }
+ else
+ root->rb_node = right;
+ node->rb_parent = right;
+}
+
+static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *left = node->rb_left;
+
+ if ((node->rb_left = left->rb_right))
+ left->rb_right->rb_parent = node;
+ left->rb_right = node;
+
+ if ((left->rb_parent = node->rb_parent))
+ {
+ if (node == node->rb_parent->rb_right)
+ node->rb_parent->rb_right = left;
+ else
+ node->rb_parent->rb_left = left;
+ }
+ else
+ root->rb_node = left;
+ node->rb_parent = left;
+}
+
+void rb_insert_color(struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *parent, *gparent;
+
+ while ((parent = node->rb_parent) && parent->rb_color == RB_RED)
+ {
+ gparent = parent->rb_parent;
+
+ if (parent == gparent->rb_left)
+ {
+ {
+ register struct rb_node *uncle = gparent->rb_right;
+ if (uncle && uncle->rb_color == RB_RED)
+ {
+ uncle->rb_color = RB_BLACK;
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ node = gparent;
+ continue;
+ }
+ }
+
+ if (parent->rb_right == node)
+ {
+ register struct rb_node *tmp;
+ __rb_rotate_left(parent, root);
+ tmp = parent;
+ parent = node;
+ node = tmp;
+ }
+
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ __rb_rotate_right(gparent, root);
+ } else {
+ {
+ register struct rb_node *uncle = gparent->rb_left;
+ if (uncle && uncle->rb_color == RB_RED)
+ {
+ uncle->rb_color = RB_BLACK;
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ node = gparent;
+ continue;
+ }
+ }
+
+ if (parent->rb_left == node)
+ {
+ register struct rb_node *tmp;
+ __rb_rotate_right(parent, root);
+ tmp = parent;
+ parent = node;
+ node = tmp;
+ }
+
+ parent->rb_color = RB_BLACK;
+ gparent->rb_color = RB_RED;
+ __rb_rotate_left(gparent, root);
+ }
+ }
+
+ root->rb_node->rb_color = RB_BLACK;
+}
+// EXPORT_SYMBOL(rb_insert_color);
+
+static void __rb_erase_color(struct rb_node *node, struct rb_node *parent,
+ struct rb_root *root)
+{
+ struct rb_node *other;
+
+ while ((!node || node->rb_color == RB_BLACK) && node != root->rb_node)
+ {
+ if (parent->rb_left == node)
+ {
+ other = parent->rb_right;
+ if (other->rb_color == RB_RED)
+ {
+ other->rb_color = RB_BLACK;
+ parent->rb_color = RB_RED;
+ __rb_rotate_left(parent, root);
+ other = parent->rb_right;
+ }
+ if ((!other->rb_left ||
+ other->rb_left->rb_color == RB_BLACK)
+ && (!other->rb_right ||
+ other->rb_right->rb_color == RB_BLACK))
+ {
+ other->rb_color = RB_RED;
+ node = parent;
+ parent = node->rb_parent;
+ }
+ else
+ {
+ if (!other->rb_right ||
+ other->rb_right->rb_color == RB_BLACK)
+ {
+ register struct rb_node *o_left;
+ if ((o_left = other->rb_left))
+ o_left->rb_color = RB_BLACK;
+ other->rb_color = RB_RED;
+ __rb_rotate_right(other, root);
+ other = parent->rb_right;
+ }
+ other->rb_color = parent->rb_color;
+ parent->rb_color = RB_BLACK;
+ if (other->rb_right)
+ other->rb_right->rb_color = RB_BLACK;
+ __rb_rotate_left(parent, root);
+ node = root->rb_node;
+ break;
+ }
+ }
+ else
+ {
+ other = parent->rb_left;
+ if (other->rb_color == RB_RED)
+ {
+ other->rb_color = RB_BLACK;
+ parent->rb_color = RB_RED;
+ __rb_rotate_right(parent, root);
+ other = parent->rb_left;
+ }
+ if ((!other->rb_left ||
+ other->rb_left->rb_color == RB_BLACK)
+ && (!other->rb_right ||
+ other->rb_right->rb_color == RB_BLACK))
+ {
+ other->rb_color = RB_RED;
+ node = parent;
+ parent = node->rb_parent;
+ }
+ else
+ {
+ if (!other->rb_left ||
+ other->rb_left->rb_color == RB_BLACK)
+ {
+ register struct rb_node *o_right;
+ if ((o_right = other->rb_right))
+ o_right->rb_color = RB_BLACK;
+ other->rb_color = RB_RED;
+ __rb_rotate_left(other, root);
+ other = parent->rb_left;
+ }
+ other->rb_color = parent->rb_color;
+ parent->rb_color = RB_BLACK;
+ if (other->rb_left)
+ other->rb_left->rb_color = RB_BLACK;
+ __rb_rotate_right(parent, root);
+ node = root->rb_node;
+ break;
+ }
+ }
+ }
+ if (node)
+ node->rb_color = RB_BLACK;
+}
+
+void rb_erase(struct rb_node *node, struct rb_root *root)
+{
+ struct rb_node *child, *parent;
+ int color;
+
+ if (!node->rb_left)
+ child = node->rb_right;
+ else if (!node->rb_right)
+ child = node->rb_left;
+ else
+ {
+ struct rb_node *old = node, *left;
+
+ node = node->rb_right;
+ while ((left = node->rb_left) != NULL)
+ node = left;
+ child = node->rb_right;
+ parent = node->rb_parent;
+ color = node->rb_color;
+
+ if (child)
+ child->rb_parent = parent;
+ if (parent)
+ {
+ if (parent->rb_left == node)
+ parent->rb_left = child;
+ else
+ parent->rb_right = child;
+ }
+ else
+ root->rb_node = child;
+
+ if (node->rb_parent == old)
+ parent = node;
+ node->rb_parent = old->rb_parent;
+ node->rb_color = old->rb_color;
+ node->rb_right = old->rb_right;
+ node->rb_left = old->rb_left;
+
+ if (old->rb_parent)
+ {
+ if (old->rb_parent->rb_left == old)
+ old->rb_parent->rb_left = node;
+ else
+ old->rb_parent->rb_right = node;
+ } else
+ root->rb_node = node;
+
+ old->rb_left->rb_parent = node;
+ if (old->rb_right)
+ old->rb_right->rb_parent = node;
+ goto color;
+ }
+
+ parent = node->rb_parent;
+ color = node->rb_color;
+
+ if (child)
+ child->rb_parent = parent;
+ if (parent)
+ {
+ if (parent->rb_left == node)
+ parent->rb_left = child;
+ else
+ parent->rb_right = child;
+ }
+ else
+ root->rb_node = child;
+
+ color:
+ if (color == RB_BLACK)
+ __rb_erase_color(child, parent, root);
+}
+// EXPORT_SYMBOL(rb_erase);
+
+/*
+ * This function returns the first node (in sort order) of the tree.
+ */
+struct rb_node *rb_first(struct rb_root *root)
+{
+ struct rb_node *n;
+
+ n = root->rb_node;
+ if (!n)
+ return NULL;
+ while (n->rb_left)
+ n = n->rb_left;
+ return n;
+}
+// EXPORT_SYMBOL(rb_first);
+
+struct rb_node *rb_last(struct rb_root *root)
+{
+ struct rb_node *n;
+
+ n = root->rb_node;
+ if (!n)
+ return NULL;
+ while (n->rb_right)
+ n = n->rb_right;
+ return n;
+}
+// EXPORT_SYMBOL(rb_last);
+
+struct rb_node *rb_next(struct rb_node *node)
+{
+ /* If we have a right-hand child, go down and then left as far
+ as we can. */
+ if (node->rb_right) {
+ node = node->rb_right;
+ while (node->rb_left)
+ node=node->rb_left;
+ return node;
+ }
+
+ /* No right-hand children. Everything down and left is
+ smaller than us, so any 'next' node must be in the general
+ direction of our parent. Go up the tree; any time the
+ ancestor is a right-hand child of its parent, keep going
+ up. First time it's a left-hand child of its parent, said
+ parent is our 'next' node. */
+ while (node->rb_parent && node == node->rb_parent->rb_right)
+ node = node->rb_parent;
+
+ return node->rb_parent;
+}
+// EXPORT_SYMBOL(rb_next);
+
+struct rb_node *rb_prev(struct rb_node *node)
+{
+ /* If we have a left-hand child, go down and then right as far
+ as we can. */
+ if (node->rb_left) {
+ node = node->rb_left;
+ while (node->rb_right)
+ node=node->rb_right;
+ return node;
+ }
+
+ /* No left-hand children. Go up till we find an ancestor which
+ is a right-hand child of its parent */
+ while (node->rb_parent && node == node->rb_parent->rb_left)
+ node = node->rb_parent;
+
+ return node->rb_parent;
+}
+// EXPORT_SYMBOL(rb_prev);
+
+void rb_replace_node(struct rb_node *victim, struct rb_node *new,
+ struct rb_root *root)
+{
+ struct rb_node *parent = victim->rb_parent;
+
+ /* Set the surrounding nodes to point to the replacement */
+ if (parent) {
+ if (victim == parent->rb_left)
+ parent->rb_left = new;
+ else
+ parent->rb_right = new;
+ } else {
+ root->rb_node = new;
+ }
+ if (victim->rb_left)
+ victim->rb_left->rb_parent = new;
+ if (victim->rb_right)
+ victim->rb_right->rb_parent = new;
+
+ /* Copy the pointers/colour from the victim to the replacement */
+ *new = *victim;
+}
+// EXPORT_SYMBOL(rb_replace_node);
projects / thirdparty / haproxy.git / commitdiff
