* add implementation of bindfs, which can be used to bind-mount

a folder to some other place in the filesystem hierarchy
* add helper function to VFS that encapsulates the "conversion" of a
  vnode-pointer to a fs_vnode-pointer (used by bindfs)

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40238 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/fs/vfs.cpp

@@ -4100,6 +4100,18 @@ vfs_vnode_to_node_ref(struct vnode* vnode, dev_t* _mountID, ino_t* _vnodeID)
 }
 
 
+/*!
+	Helper function abstracting the process of "converting" a given
+	vnode-pointer to a fs_vnode-pointer.
+	Currently only used in bindfs.
+*/
+extern "C" fs_vnode*
+vfs_fsnode_for_vnode(struct vnode* vnode)
+{
+	return vnode;
+}
+
+
 /*!
 	Calls fs_open() on the given vnode and returns a new
 	file descriptor for it