Adding upstream version 2.6.12.upstream/2.6.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 121 insertions, 0 deletions

diff --git a/include/import/eb32sctree.h b/include/import/eb32sctree.h
new file mode 100644
index 0000000..5ace662
--- /dev/null
+++ b/include/import/eb32sctree.h
@@ -0,0 +1,121 @@
+/*
+ * Elastic Binary Trees - macros and structures for operations on 32bit nodes.
+ * Version 6.0.6 with backports from v7-dev
+ * (C) 2002-2017 - Willy Tarreau <w@1wt.eu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _EB32SCTREE_H
+#define _EB32SCTREE_H
+
+#include "ebtree.h"
+
+
+/* Return the structure of type <type> whose member <member> points to <ptr> */
+#define eb32sc_entry(ptr, type, member) container_of(ptr, type, member)
+
+/*
+ * Exported functions and macros.
+ * Many of them are always inlined because they are extremely small, and
+ * are generally called at most once or twice in a program.
+ */
+
+/*
+ * The following functions are not inlined by default. They are declared
+ * in eb32sctree.c, which simply relies on their inline version.
+ */
+struct eb32sc_node *eb32sc_lookup_ge(struct eb_root *root, u32 x, unsigned long scope);
+struct eb32sc_node *eb32sc_lookup_ge_or_first(struct eb_root *root, u32 x, unsigned long scope);
+struct eb32sc_node *eb32sc_insert(struct eb_root *root, struct eb32sc_node *new, unsigned long scope);
+void eb32sc_delete(struct eb32sc_node *node);
+
+/* Walks down left starting at root pointer <start>, and follow the leftmost
+ * branch whose scope matches <scope>. It either returns the node hosting the
+ * first leaf on that side, or NULL if no leaf is found. <start> may either be
+ * NULL or a branch pointer. The pointer to the leaf (or NULL) is returned.
+ */
+static inline struct eb32sc_node *eb32sc_walk_down_left(eb_troot_t *start, unsigned long scope)
+{
+	struct eb_root *root;
+	struct eb_node *node;
+	struct eb32sc_node *eb32;
+
+	if (unlikely(!start))
+		return NULL;
+
+	while (1) {
+		if (eb_gettag(start) == EB_NODE) {
+			root = eb_untag(start, EB_NODE);
+			node = eb_root_to_node(root);
+			eb32 = container_of(node, struct eb32sc_node, node);
+			if (eb32->node_s & scope) {
+				start = node->branches.b[EB_LEFT];
+				continue;
+			}
+			start = node->node_p;
+		}
+		else {
+			root = eb_untag(start, EB_LEAF);
+			node = eb_root_to_node(root);
+			eb32 = container_of(node, struct eb32sc_node, node);
+			if (eb32->leaf_s & scope)
+				return eb32;
+			start = node->leaf_p;
+		}
+
+		/* here we're on a node that doesn't match the scope. We have
+		 * to walk to the closest right location.
+		 */
+		while (eb_gettag(start) != EB_LEFT)
+			/* Walking up from right branch, so we cannot be below root */
+			start = (eb_root_to_node(eb_untag(start, EB_RGHT)))->node_p;
+
+		/* Note that <start> cannot be NULL at this stage */
+		root = eb_untag(start, EB_LEFT);
+		start = root->b[EB_RGHT];
+		if (eb_clrtag(start) == NULL)
+			return NULL;
+	}
+}
+
+/* Return next node in the tree, starting with tagged parent <start>, or NULL if none */
+static inline struct eb32sc_node *eb32sc_next_with_parent(eb_troot_t *start, unsigned long scope)
+{
+	while (eb_gettag(start) != EB_LEFT)
+		/* Walking up from right branch, so we cannot be below root */
+		start = (eb_root_to_node(eb_untag(start, EB_RGHT)))->node_p;
+
+	/* Note that <t> cannot be NULL at this stage */
+	start = (eb_untag(start, EB_LEFT))->b[EB_RGHT];
+	if (eb_clrtag(start) == NULL)
+		return NULL;
+
+	return eb32sc_walk_down_left(start, scope);
+}
+
+/* Return next node in the tree, or NULL if none */
+static inline struct eb32sc_node *eb32sc_next(struct eb32sc_node *eb32, unsigned long scope)
+{
+	return eb32sc_next_with_parent(eb32->node.leaf_p, scope);
+}
+
+/* Return leftmost node in the tree, or NULL if none */
+static inline struct eb32sc_node *eb32sc_first(struct eb_root *root, unsigned long scope)
+{
+	return eb32sc_walk_down_left(root->b[0], scope);
+}
+
+#endif /* _EB32SC_TREE_H */