diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 2107a06..d9a82f2 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3162,7 +3162,7 @@
 	return 0;
 }
 
-static void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
+void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
 {
 	wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait,
 		    TASK_UNINTERRUPTIBLE);