diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index e0bb217c01e2a6c8389bf9ec2dfb2f56f0fab7c8..5014749fd4b45d346f9c3d4f13495814437cf3d2 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -467,6 +467,10 @@ static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		return -EOPNOTSUPP;
 
 	old_cred = ovl_override_creds(inode->i_sb);
+
+	if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
+		filemap_write_and_wait(realinode->i_mapping);
+
 	err = realinode->i_op->fiemap(realinode, fieinfo, start, len);
 	revert_creds(old_cred);