Index: uspace/srv/fs/exfat/exfat_ops.c
===================================================================
--- uspace/srv/fs/exfat/exfat_ops.c	(revision 5930e3f1d24e5be1fe249bd81c683a3dec338378)
+++ uspace/srv/fs/exfat/exfat_ops.c	(revision 951f32ce8d4ff8508530ae4ef61d13827f1b2c0f)
@@ -89,4 +89,5 @@
 static bool exfat_is_file(fs_node_t *node);
 static service_id_t exfat_service_get(fs_node_t *node);
+static long exfat_size_block(service_id_t);
 
 /*
@@ -912,4 +913,11 @@
 }
 
+long exfat_size_block(service_id_t service_id)
+{
+	exfat_bs_t *bs;
+	bs = block_bb_get(service_id);
+	
+	return BPC(bs);
+}
 
 /** libfs operations */
@@ -930,5 +938,6 @@
 	.is_directory = exfat_is_directory,
 	.is_file = exfat_is_file,
-	.service_get = exfat_service_get
+	.service_get = exfat_service_get,
+	.size_block = exfat_size_block
 };