Index: uspace/lib/c/generic/bd.c
===================================================================
--- uspace/lib/c/generic/bd.c	(revision 4802dd7d8d17cb02ec8f79547ffde538bb8c6736)
+++ uspace/lib/c/generic/bd.c	(revision fa65df1b0e4913f9a21409297f25851fc9d1ee66)
@@ -150,4 +150,15 @@
 }
 
+int bd_sync_cache(bd_t *bd, aoff64_t ba, size_t cnt)
+{
+	async_exch_t *exch = async_exchange_begin(bd->sess);
+
+	int rc = async_req_3_0(exch, BD_SYNC_CACHE, LOWER32(ba),
+	    UPPER32(ba), cnt);
+	async_exchange_end(exch);
+
+	return rc;
+}
+
 int bd_get_block_size(bd_t *bd, size_t *rbsize)
 {