diff --git a/drivers/block/rnbd/rnbd-proto.h b/drivers/block/rnbd/rnbd-proto.h
index 5e74ae86169b..64f1cfe9f8ef 100644
--- a/drivers/block/rnbd/rnbd-proto.h
+++ b/drivers/block/rnbd/rnbd-proto.h
@@ -18,7 +18,7 @@
 #include <rdma/ib.h>
 
 #define RNBD_PROTO_VER_MAJOR 2
-#define RNBD_PROTO_VER_MINOR 1
+#define RNBD_PROTO_VER_MINOR 2
 
 /* The default port number the RTRS server is listening on. */
 #define RTRS_PORT 1234
@@ -198,6 +198,7 @@ struct rnbd_msg_io {
  * @RNBD_F_SYNC:	     request is sync (sync write or read)
  * @RNBD_F_FUA:             forced unit access
  * @RNBD_F_PREFLUSH:	    request for cache flush
+ * @RNBD_F_NOUNMAP:	    do not free blocks when zeroing
  */
 enum rnbd_io_flags {
 
@@ -212,7 +213,8 @@ enum rnbd_io_flags {
 	/* Flags */
 	RNBD_F_SYNC  = 1<<(RNBD_OP_BITS + 0),
 	RNBD_F_FUA   = 1<<(RNBD_OP_BITS + 1),
-	RNBD_F_PREFLUSH = 1<<(RNBD_OP_BITS + 2)
+	RNBD_F_PREFLUSH = 1<<(RNBD_OP_BITS + 2),
+	RNBD_F_NOUNMAP = 1<<(RNBD_OP_BITS + 3)
 };
 
 static inline u32 rnbd_op(u32 flags)
@@ -247,6 +249,9 @@ static inline blk_opf_t rnbd_to_bio_flags(u32 rnbd_opf)
 		break;
 	case RNBD_OP_WRITE_ZEROES:
 		bio_opf = REQ_OP_WRITE_ZEROES;
+
+		if (rnbd_opf & RNBD_F_NOUNMAP)
+			bio_opf |= REQ_NOUNMAP;
 		break;
 	default:
 		WARN(1, "Unknown RNBD type: %d (flags %d)\n",
@@ -285,6 +290,9 @@ static inline u32 rq_to_rnbd_flags(struct request *rq)
 		break;
 	case REQ_OP_WRITE_ZEROES:
 		rnbd_opf = RNBD_OP_WRITE_ZEROES;
+
+		if (rq->cmd_flags & REQ_NOUNMAP)
+			rnbd_opf |= RNBD_F_NOUNMAP;
 		break;
 	case REQ_OP_FLUSH:
 		rnbd_opf = RNBD_OP_FLUSH;