Create a slightly more generic extent-caching structure

1 files changed, 53 insertions, 0 deletions

diff --git a/extent-cache.h b/extent-cache.h
new file mode 100644
index 00000000..9e933752
--- /dev/null
+++ b/extent-cache.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2007 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * 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 021110-1307, USA.
+ */
+
+#ifndef __PENDING_EXTENT__
+#define __PENDING_EXTENT__
+#include "kerncompat.h"
+#include "rbtree.h"
+
+struct cache_tree {
+	struct rb_root root;
+};
+
+struct cache_extent {
+	struct rb_node rb_node;
+	u64 start;
+	u64 size;
+};
+
+void cache_tree_init(struct cache_tree *tree);
+void remove_cache_extent(struct cache_tree *tree,
+			  struct cache_extent *pe);
+struct cache_extent *find_first_cache_extent(struct cache_tree *tree,
+						 u64 start);
+struct cache_extent *next_cache_extent(struct cache_extent *pe);
+struct cache_extent *find_cache_extent(struct cache_tree *tree,
+					   u64 start, u64 size);
+int insert_cache_extent(struct cache_tree *tree, u64 start, u64 size);
+int insert_existing_cache_extent(struct cache_tree *tree,
+				 struct cache_extent *pe);
+
+static inline void free_cache_extent(struct cache_extent *pe)
+{
+	free(pe);
+}
+
+struct cache_extent *alloc_pending_extent(u64 start, u64 size);
+
+#endif