diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 539f36c..b35bd64 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -68,6 +68,7 @@
 {
 	return test_bit(BDI_writeback_running, &bdi->state);
 }
+EXPORT_SYMBOL(writeback_in_progress);
 
 static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
 {