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-rw-r--r--sys/compat/linuxkpi/common/include/linux/radix-tree.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/radix-tree.h b/sys/compat/linuxkpi/common/include/linux/radix-tree.h
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index 000000000000..838b81cfdf73
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+++ b/sys/compat/linuxkpi/common/include/linux/radix-tree.h
@@ -0,0 +1,62 @@
+/*-
+ * Copyright (c) 2010 Isilon Systems, Inc.
+ * Copyright (c) 2010 iX Systems, Inc.
+ * Copyright (c) 2010 Panasas, Inc.
+ * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#ifndef _LINUX_RADIX_TREE_H_
+#define _LINUX_RADIX_TREE_H_
+
+#define RADIX_TREE_MAP_SHIFT 6
+#define RADIX_TREE_MAP_SIZE (1 << RADIX_TREE_MAP_SHIFT)
+#define RADIX_TREE_MAP_MASK (RADIX_TREE_MAP_SIZE - 1)
+#define RADIX_TREE_MAX_HEIGHT \
+ DIV_ROUND_UP((sizeof(long) * NBBY), RADIX_TREE_MAP_SHIFT)
+
+struct radix_tree_node {
+ void *slots[RADIX_TREE_MAP_SIZE];
+ int count;
+};
+
+struct radix_tree_root {
+ struct radix_tree_node *rnode;
+ gfp_t gfp_mask;
+ int height;
+};
+
+#define RADIX_TREE_INIT(mask) \
+ { .rnode = NULL, .gfp_mask = mask, .height = 0 };
+#define INIT_RADIX_TREE(root, mask) \
+ { (root)->rnode = NULL; (root)->gfp_mask = mask; (root)->height = 0; }
+#define RADIX_TREE(name, mask) \
+ struct radix_tree_root name = RADIX_TREE_INIT(mask)
+
+void *radix_tree_lookup(struct radix_tree_root *, unsigned long);
+void *radix_tree_delete(struct radix_tree_root *, unsigned long);
+int radix_tree_insert(struct radix_tree_root *, unsigned long, void *);
+
+#endif /* _LINUX_RADIX_TREE_H_ */