Make URI structures reference-counted.

src/include/gpxe/open.h

@@ -46,9 +46,6 @@ struct uri_opener {
 	 * @v xfer		Data transfer interface
 	 * @v uri		URI
 	 * @ret rc		Return status code
-	 *
-	 * This method takes ownership of the URI structure, and is
-	 * responsible for eventually calling free_uri().
 	 */
 	int ( * open ) ( struct xfer_interface *xfer, struct uri *uri );
 };

src/include/gpxe/uri.h

@@ -8,6 +8,7 @@
  */
 
 #include <stdlib.h>
+#include <gpxe/refcnt.h>
 
 /** A Uniform Resource Identifier
  *
@@ -37,6 +38,8 @@
  *   query = "what=is", fragment = "this"
  */
 struct uri {
+	/** Reference count */
+	struct refcnt refcnt;
 	/** Scheme */
 	const char *scheme;
 	/** Opaque part */
@@ -100,15 +103,25 @@ static inline int uri_has_relative_path ( struct uri *uri ) {
 }
 
 /**
- * Free URI structure
+ * Increment URI reference count
  *
  * @v uri		URI
- *
- * Frees all the dynamically-allocated storage used by the URI
- * structure.
+ * @ret uri		URI
  */
-static inline void free_uri ( struct uri *uri ) {
-	free ( uri );
+static inline __attribute__ (( always_inline )) struct uri *
+uri_get ( struct uri *uri ) {
+	ref_get ( &uri->refcnt );
+	return uri;
+}
+
+/**
+ * Decrement URI reference count
+ *
+ * @v uri		URI
+ */
+static inline __attribute__ (( always_inline )) void
+uri_put ( struct uri *uri ) {
+	ref_put ( &uri->refcnt );
 }
 
 extern struct uri * parse_uri ( const char *uri_string );