btrfs-progs: libbtrfs, make exported headers compatible with C++

Add externs and don't use a reserved keyword.

Signed-off-by: David Sterba <dsterba@suse.cz>

rbtree-utils.h

@@ -21,6 +21,10 @@
 
 #include "rbtree.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* The common insert/search/free functions */
 typedef int (*rb_compare_nodes)(struct rb_node *node1, struct rb_node *node2);
 typedef int (*rb_compare_keys)(struct rb_node *node, void *key);
@@ -42,4 +46,8 @@ static void free_##name##_tree(struct rb_root *root)	\
 	rb_free_nodes(root, free_func);			\
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

rbtree.h

@@ -34,6 +34,10 @@
 #include <btrfs/kerncompat.h>
 #endif /* BTRFS_FLAT_INCLUDES */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct rb_node {
 	unsigned long  __rb_parent_color;
 	struct rb_node *rb_right;
@@ -75,7 +79,7 @@ extern struct rb_node *rb_first_postorder(const struct rb_root *);
 extern struct rb_node *rb_next_postorder(const struct rb_node *);
 
 /* Fast replacement of a single node without remove/rebalance/add/rebalance */
-extern void rb_replace_node(struct rb_node *victim, struct rb_node *new, 
+extern void rb_replace_node(struct rb_node *victim, struct rb_node *new_node,
 			    struct rb_root *root);
 
 static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
@@ -107,4 +111,8 @@ static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
 			typeof(*pos), field); 1; }); \
 	     pos = n)
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* _LINUX_RBTREE_H */

rbtree_augmented.h

@@ -26,6 +26,10 @@
 
 #include "rbtree.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * Please note - only struct rb_augment_callbacks and the prototypes for
  * rb_insert_augmented() and rb_erase_augmented() are intended to be public.
@@ -228,4 +232,8 @@ rb_erase_augmented(struct rb_node *node, struct rb_root *root,
 		__rb_erase_color(rebalance, root, augment->rotate);
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* _LINUX_RBTREE_AUGMENTED_H */