Added new but empty function file_cache_invalidate_file_map().

This is needed in case the on-disk representation of a file changes (due to reorganization/defragmentation).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13660 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/cache/file_cache.cpp

@@ -868,3 +868,9 @@ file_cache_write(void *_cacheRef, off_t offset, const void *buffer, size_t *_siz
 }
 
 
+extern "C" status_t
+file_cache_invalidate_file_map(void *_cacheRef, off_t offset, off_t size)
+{
+	// ToDo: implement me as soon as file maps (extents) are cached
+	return B_OK;
+}