Add PREVENTALLOWMEDIUMREMOVAL support

lib/sync.c

@@ -419,6 +419,26 @@ iscsi_startstopunit_sync(struct iscsi_context *iscsi, int lun,
 	return state.task;
 }
 
+struct scsi_task *
+iscsi_preventallow_sync(struct iscsi_context *iscsi, int lun,
+			int prevent)
+{
+	struct iscsi_sync_state state;
+
+	memset(&state, 0, sizeof(state));
+
+	if (iscsi_preventallow_task(iscsi, lun, prevent,
+				    scsi_sync_cb, &state) == NULL) {
+		iscsi_set_error(iscsi,
+				"Failed to send PreventAllowMediumRemoval command");
+		return NULL;
+	}
+
+	event_loop(iscsi, &state);
+
+	return state.task;
+}
+
 struct scsi_task *
 iscsi_synchronizecache16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
 			      uint32_t num_blocks, int syncnv, int immed)